The CBD (the Central Business District)

The typical CBD is in the commercial and cultural activity in a city. In many large cities, it is immediately recognizable by tall skyscrapers, the neon lights at night and the very high density of buildings, traffic and people. The CBD is usually highly accessible. It is the focus of roads, with bus and railway stations near by. The CBD usually has the highest density of bus services and taxis in the whole of the urban area. Although the residential population is only very small, during the day and evening the CBD is crowded with people working, shopping or seeking entertainment. Main functions of the CBD Shops: The CBD is usually at the top of the shopping hierarchy in a city. It has the widest range of shops and the largest department stores. Shops mainly sell comparison or high-order goods and they draw their customers from a wide sphere of influence. The highest land costs are in the centre of the CBD. In the core of the CBD, there are large department stores and branches of many national chains of shops. Smaller shops, often privately owned, are located on the edges of the CBD in the fringe area called the frame. Some shops, such as clothing, shoe and jewellery shops tend to cluster together to take advantage of competition, while others are more dispersed, such as newsagents and chemists. Offices: Banks, building societies, solicitors, company headquarters, insurance companies and government offices occupy high-rise office blocks or the upper floors above shops in the CBD. Culture & entertainment: Parts of the CBD ‘come alive' at night as the theatres, cinemas, clubs, bars and restaurants attract customers. Certain parts of cities have become famous for their nightlife, such as London's West End. The CBD of a city is not static; it is a dynamic area going through phases of growth and decline. You will see some areas in decay in a CBD of a large city, with closed shops and a rundown appearance, and others that appear lively, smart and successful. The CBD also has problems with traffic congestion, parking and pollution, as well as those caused by lack of space and shortage of land. Local planners have implemented a variety of different schemes to attempt to solve the problems of the CBD. Problems and attempted solutions in the CBD: Traffic congestion: Lots of cars and shops, services and employment in the CBD create massive problems of congestion and parking in the city centres. Roads are often narrow, with little pavement space. Some solutions include: * Ring roads and by-passes to divert traffic not going into the city centre * Urban motorways and flyovers * Public transport schemes such as ‘park and ride', the Newcastle metro, trams in Manchester * Multi-storey car parks * Pedestrianization of high streets Lack of space and the high cost of land: Competition for land has led to high prices, and growing firms find it difficult to find space. In some CBDs the smaller retailers have been forced away from the city centre because of the high costs. Some solutions include: * High-rise buildings to increase the floor area available * New retailing areas in out-of-town shopping centres in the suburbs or rural-urban fringe, in a process called decentralization Pollution: Water, land, air and noise pollution are all common in city centres. Pollution is thought to contribute to the stresses of living in urban areas and to some diseases, such as asthma and bronchitis. Some solutions include: * Laws against litter and dumping sewage in rivers * Improved provision of litter bins and road sweeping * Clean Air Acts that allow only the use of smokeless fuels * Clean-fuel technology and vehicles that run on methane gas or electricity * Banning heavy lorries from passing through city centres * Increased planting of trees and shrubs Urban decline: Parts of some CBDs have declined. Shops and offices have closed down and the empty buildings and vandalized. City centres compete with out-of-town shopping centres to cater for the growing demands of shoppers. Some solutions include: * Redevelopment of zones of decline in the CBD such as King's Cross and Covent Garden in London * Expansion of the CBD into areas of the inner city – old factories and substandard terraced housing have been cleared, rehousing the occupants in the suburbs or New Towns and filling the space with new shopping and office developments

Food Manifesto Essay

The ideal food system is; sustainable, both in practice and in mindset, values necessity over want whenever food is concerned, and is available to all peoples while promoting equality. Sustainability at its hear is both a practice and a mindset. One cannot be present without the other or else they fail. The current food system is incredibly unsustainable. The use of an enormous amount of resources for the relatively small amount of energy produced is horrendous. â€Å"During the past 50 years, agricultural development policies and practices have successfully emphasized external inputs as the means to increase food production. This has led to growth in global consumption of pesticides, inorganic fertilizer, animal feedstuffs, and tractors and other machinery. These external inputs have. however, tended to substitute for natural processes and resources, rendering them more vulnerable. Pesticides have replaced biological, cultural and mechanical methods for controlling pests, weeds and diseases; inorganic fertilizers have been substituted for livestock manures, composts and nitrogen-fixing crops: information for management decisions comes from input suppliers, researchers rather than from local sources: machines have replaced labor: and fossil fuels have been substituted for local energy sources† (Pretty). The use of resources that we cannot keep using is astronomical. These resources, such as fossil fuels and heavy pesticides, need to be left alone or need to stop being developed. The way we can move away from these products is simple, although tough, method of switching over to natural, organic pesticides and fertilizers. To cut down on the cost and use of fossil fuels, one must cut down on the size of one’s land and employ local people to harvest the crops. â€Å"A meat based diet (28% calories from animal products) uses twice as much energy to produce as a vegetarian diet. Meat production as it is widely practiced today also has significant environmental impacts on land use, water use and water pollution, and air emissions. According to the Union of Concerned Scientists – considering land use, and water use and pollution – eating less meat is one of the most effective environmental consumer choices. Chemical fertilizers and pesticides require large amounts of energy to produce, pollute our soil and water, and present real human health impacts. Growth in retail sales of organic food products has equaled 20% or more per year since 1990† (Center for Sustainable Systems). These practices are wasteful yet alternatives are present. The way in which our food is produced needs to be fundamentally changed and this occurs when the mindset of the populous is changed. The current food system has been so wasteful, that the practices and mindset of the people just 50 years ago seems foreign. â€Å"Less than 50 years ago most rural households in the US sustained themselves by farming. While some agricultural products were sold for money on the open market, others were produced solely for household consumption of for bartering with neighbors† (Lyson 8). This practice is the same that my family uses at home and my neighbors see us as very â€Å"hippy-ish†. This is not a bad thing to be called this yet it is odd that the practices that were completely normal just half a century ago are now seen as unusual. These practices are the foundation of my ideal food system, one that is founded upon the wants of the body first in consideration with the land. The land is an extension of the body and must be nourished just the same. This is helped with the sharing of resources between neighbors. The necessity for food is valued higher than the want for types of food in my ideal food system. The want for expensive foods, convenient foods and cheap foods is an idea that has consumed the country, and the food system. The fact that we produce so much food has made us greedy. The way in which we consume food and are constantly absorbing advertisements is preposterous. The size of our grocery stores has increased due to the need for more space for all of the choices that we are allowed. Most of these items are not grown entirely in the United States but are made up from the products developed here. â€Å"There is no shortage of food here, and everybody knows it. In fact, for much of this century, national agricultural policy has been preoccupied with surplus, and individual Americans have been preoccupied with avoiding, losing, or hiding the corporeal effects of overeating† (Poppendieck). This has led to an epidemic of choice, not obesity. The way in which we behave when confronted with these choices is odd to say the least as we are drawn to shiny, bright packaging rather than the dull, healthy apple. â€Å"Because we have lost our faith in both religion and science as guides to eating, we rely on popular writers to steer us through a welter of confusing and contradictory information† (DuPuis). The food writers of the nation have left us with so much to absorb that we are just as lost reading their work as we are at the grocery store. This has led to the mindless consumption that has further led to the overconsumption of resources to fuel our poor habits. The way in which the people will learn to implement this new way of thinking, abandon want and embrace need, will be difficult. This starts in schools with children and will foster that way that they eat, thus starting a new generation with the â€Å"right† mentality. â€Å"Such changes in the food supply and decreased activity are largely socioeconomically-driven (urbanization, more cars owned and operated, less safety in urban areas, children being driven everywhere instead of walking, more reliance on fast food as more households have both parents working away from home)† (Massad). This also reiterates my point on the decrease of unsustainable resources in our food system. The encouragement for people to walk places and to avoid fast food is a start but the children are the bet recipients for this type of indoctrination as they are the most impressionable. This is very apparent as many people as adults take part in activities not out of personal preference but because that was how they were raised. Availability is the clearest factor in devising a new food system. The locality of food should be so much a part of a community, one cannot walk down a street without seeing at least 5 vendors from the surrounding family farms. â€Å"Much of what was produced was not sold on the open market but rather was bartered for goods and services in the local community or else used for home consumption† (Lyson 9). The way that a local food system should work is that food should be produce for the family first, and then the surplus will be offered in town for money. When money is not readily available, then services will be exchanged such as plumbing, painting, clothing, etc. The need to share food is important for all people as just years ago food was â€Å"produced solely for household consumption or for bartering with neighbors† (Lyson 8). This is the only way in which our local food system will be able to flourish with the implementation of a semi bartering system that will allow farmers and families to exchange food items for other food items. This is only possible with a local food system as the current food system is too monetarily based to be able to function in this respect. The solidarity of humankind to be courteous to one another begins not with the treatment of all people equally, but the treatment of the food system as a living organism. This is possible through much sacrifice but a change is necessary in order for the human race to end a problem that has haunted us for all of our existence. Through a collective effort, the new sustainable, local food system focusing on the needs of people as opposed to what people want from it, will be able to bring humankind into a â€Å"more glorious dawn. † (Sagan) DuPuis, E. Melanie. â€Å"Angels and Vegetables: A Brief History of Food Advice in America. † Gastronomica: The Journal of Food and Culture 7, no. 3 (08/01 2007): 34-44. Lyson, Thomas A. Civic Agriculture: Reconnecting Farm, Food, and Community. Medford, Massachusetts: Tufts University Press, 2004. Massad, Susan J. â€Å"Super-Sizing America: Geography, Income, Fast Food, and Whole Food. † Human Geography 2, no. 2 (2009): 52-69. McKibben, Bill. â€Å"The Cuba Diet. † Harper’s Magazine 310, no. 1859 (Apr 2005): 61-69. Poppendieck, Janet. â€Å"Want Amid Plenty: From Hunger to Inequality. † In Hungry for Profit: The Agribusiness Threat to Farmers, Food, and the Environment, edited by Fred Magdoff, John Bellamy Foster and Frederick H. Buttel, 189-202. New York: Monthly Review Press, 2000. Pretty, Jules N. â€Å"Participatory Learning for Sustainable Agriculture. † World Development 23, no. 8 (1995): 1247-63. Schlosser, Eric. Fast Food Nation: The Dark Side of the All-American Meal. New York: Perennial, 2002.

Medieval society and contemporary times

The Dark or Middle Age is usually the time that stretches from year 400 to 1000 which, historically speaking, points us to the European Early Middle Ages. The Italian scholar Francesco Petrarca coined the idea of a dark age. Though it was originally projected as a comprehensive critique of the nature of Latin literature in later times, later historians stretched the concept to contain not only the insufficiency of Latin literature but also a lack of present-day written historical accounts and material cultural achievements in the larger context.The term itself has been further enlarged by popular culture as a means to clearly illustrate the Middle Ages as an age reeking of backwardness, lengthening its pejorative practice and increasing its span. In the 20th century, the consequent emergence of archaeology and other related field in the sciences has removed much dust on the period and provided a more nuanced comprehension of its positive and contributory advancements. Other expressio ns of periodization were put forward: the Early Middle Ages, Late Antiquity, and the Great Migrations, depending on what fraction of culture is being highlighted.Petrarca noted that even though Classical Antiquity lacked the sense of Christianity it nevertheless had much of advancement in terms of culture whereas in Petrarca’s time was now labeled as the age of darkness because of the lapse in such cultural achievements.Two periods in history were observed and written by Petrarca: the Greek and Roman classical period trailed by an age of darkness in which Petrarca saw himself as still existing. The Roman Empire is believed by humanists to rise again one day and bring back classic cultural stainlessness. The promotion of classical culture championed as an ideological campaign by humanists was the beginning foundation of the concept of the European Dark Ages, and was for that reason not a neutral historical examination. It was conceived to convey disapproval and dissatisfaction of one period in time and the endorsement of another.Humanists such as Leonardo Bruni believed they had attained this new age during the late 14th and early 15th century, and that a third, Modern Age had commenced. With Petrarca labeling their age as â€Å"dark†, the age before their own had in effect become a â€Å"middle† age sandwiched between the classic and the modern. Around 1439, the first use of the term â€Å"Middle Age† appears with Flavio Biondo.The very definition of feudalism calls for the use of many qualifiers primarily because there is no broadly established agreement of what it stands for. A working definition is desirable in order for one to start to comprehend feudalism.During the middle ages, the idea of Feudalism points to a general and broad set of reciprocal legal and military obligations and responsibilities among the warrior nobility of Europe which revolved around the three major concepts of vassals, fiefs, and lords and on how these t hree crucial elements fit together inn the society. A lord was a noble who possessed land, a vassal was an individual who was permitted or rewarded custody of the land by the lord, and the land was branded as a fief. The vassal would present military service and assistance to the lord in exchange for the fief. Thus, the very obligations and connected relations between lord, vassal and fief form the structural basis of feudalism.The lord should have to make a certain individual a vassal before the former could grant the fief to the latter. Composed of the two-part act of homage and oath of fealty, this was practiced at a formal and symbolic ritual called a commendation ceremony. The vassal would give his word to battle in the side of and for the lord at his command during homage. Fealty is rooted from the Latin fidelitas, or faithfulness. Hence, the oath of fealty is seen to be a promise that the vassal will be faithful and devoted to the lord. The lord and vassal were now in a feuda l relationship with agreed-upon mutual obligations to one another right after the completion of the commendation.Granting a fief, or its revenues, to the vassal is one of the lord’s major obligations in a feudal system inasmuch as the fief is primary reason as to why the vassal preferred to engage himself into the relationship with the lord. Moreover, the lord from time to time had to accomplish other responsibilities to the vassal and fief which includes, among other else, the maintenance of such a relationship. It was still the lord's responsibility to sustain and keep the land in good condition since the lord had not given the land away but merely loaned it to the vassal while the latter had the privilege to amass revenues produced from the fief. The protection of the land and the vassal from harm is another rightful responsibility of the lord.On the other hand, the core obligation of the vassal towards the lord was to impart â€Å"aid† mostly in the form of militar y service through the utilization of available equipment the vassal could get hold of through the revenues generated from the fief. In essence, the vassal was responsible to take heed of the calls for the service in the military on lord’s behalf. It is quite notable that this guarantee and protection of military assistance was the ultimate motivation the lord preferred to form a junction with the vassal into the feudal relationship.Likewise, the vassal also had to fulfill other obligations to the lord from time to time which includes providing the lord with â€Å"counsel† so that the lord, when faced a major decision, would summon all his vassals and hold a council. One common illustration to this is when the lord had to decide whether or not to go to war. Moreover, the vassal may have been mandated to offer a consented quantity of his farm’s produce to his lord, and that the vassal was occasionally prescribed to grind his wheat in the mills and bake his bread i n the ovens owned and taxed by his lord.During the medieval times, there was a conception of three orders in the medieval society. These three can be briefly identified as those who work or the peasants, those who fight or the warring class, and those who pray or the members of the clergy.For the most part, the peasants provide the manpower in the upkeep or maintenance of the whole system through their labor in the fields and other economic institutions within the feudal system in the middle ages. These are the men and women who comprise the bulk of the system who toil not only to sustain their existence in the smaller scale but also to provide the necessary development of the system right at its very foundation.The estate of warriors in the system naturally has the obligation of fulfilling the task of protecting the system from outside invasion which may root from other systems in its proximity, or from internal disputes which may range from the peasant class up to the nobles. Thei r role is crucial in the sense that their responsibility is crucial to the safekeeping of the entire system by regulating the possibility of intrusion which can inevitably lead to the collapse of the ruling men and of the feudal system in general.Lastly, the clergymen were tasked to look after the spiritual life of the people within the medieval manor. A few of these duties include the administration of the needed sacraments with steadiness and to function as an ideological guardian of the ruling order, the absolution men and women from their sins through confession, and proclaiming secular and ecclesiastical pronouncements. In essence, the function of the clergymen in the medieval village was well beyond the ordinary functions of peasants and of the warriors for the reason that it was the village priest with whom medieval men and women identified the Church, reflecting its teachings, and authority as an utmost concern of the medieval people within the system.Apparently, there are s trands of similarities which can be observed from this class distinction between the medieval times and the contemporary generation. For the most part, the contemporary age also has within it counterparts of the medieval clergymen (priests in the Roman Catholic Church or elders in several other religious faiths), peasants (the modern working man and woman), and warriors (the military forces of nations). However, the structure of the contemporary society does not merely revolve around this three classes. Quite on the contrary, the contemporary society has a bounty of classes from which the structure of almost every nation is reflected. We now have, among other things, Non-Government Organizations which seems not be fit in any of the medieval classes.In a society based on class hierarchy, it is expected that roles are quite distinct and the functioning of every individual is separate from those of the rest. Roughly speaking, the hierarchy of classes entails the supremacy of one over t he other in both economic and social terms where the distribution of power and obligations are directly proportional the attainment of classes. To live in a hierarchy is to basically involve oneself in a system where tasks are delegated accordingly depending on the roles imminent to the class one might fall under. In contemporary society, there is a striking and undeniable existence of a hierarchy which is based on several factors such as economic, legal, and political elements to name a few.ReferencesMaliszewski, James, Lisa J. Steele, and C. A. Suleiman. Dark Ages: Europe. 160 vols: White Wolf Publishing, 2002.Russell, Frederick H. The Just War in the Middle Ages. New Ed ed. Cambridge: Cambridge University Press, 2003.

Workaholics Annotated Bibliography Example | Topics and Well Written Essays - 500 words

Workaholics - Annotated Bibliography Example They highly recommend organizations to recruit and maintain workaholics. Machlowitz and Korn are prominent psychological researchers that advocate for workaholics. Their quantitative and qualitative studies implicate that the workaholics are extremely satisfied and productive in the organization. Killinger and Fassel are major psychologists as well, who had a different perspective. Their organizational researches presented workaholics as mere difficulties to the entire workforce. According to these scholars, workaholics are unhappy and obsessive. Evidently, one cluster of scholars advocates for workaholics as the other discourages it. This is a text book that engrosses an apparent analysis of workaholics’ marriages. It purely constitutes facts about the marriage of a workaholic. In this case, this text is essential for fundamental research about workaholics’ families. It provides insights about their marital performances in society. This perspective triggers a congruent comparison of their marital performance with other domains like professional performance. According to this source, workaholic marriages manifest an elevated trend of divorce. Divorce in workaholic spouses records an average of 55%. In comparison, non-workaholic marriages recorded an average divorce rate of 16%. This trend had attributions from diverse factors. For instance, workaholic spouses spend massive durations in their jobs. They spend an average of fifty six hours per week in their jobs. In comparison, non-workaholic spouses spend an average of forty six hours per week in their jobs. Evidently, there is a massive difference in their domestic attention. Workaholics are therefore controlled majorly by external events. They are never in charge over the external events. The author of this text is a profound professional in mental health. He also possesses knowledge under organizational dynamics. This book is essential for research under

Chinese Female Customers Attitudes by Shopping Online Research Paper

Chinese Female Customers Attitudes by Shopping Online - Research Paper Example The Internet is rapidly becoming commercialized. It is swamped with online shopping and â€Å"shopping malls†. Customers can browse on their favorite online store viewing products (like 360buy) and food items (like Taobao). People describe it as â€Å"impossible is our thinking, but not what we can buy.† Electronic-commerce began in 1984 in North America when it was introduced as an application of Internet technology. The rapid growth of e-commerce proved immensely successful in the business world. China was a little late in entering the e-commerce business but after its arrival, it has shown tremendous growth potential in all of the Internet-related industries. Many people consider the term commerce as something that describes transactions between business partners. To many, this concept is very narrow. They preferred using the term e-business. E-business is a broader definition of e-commerce as it includes the service industry along with the retail business. It also r epresents collaboration with business partners and electronic transactions in an organization. Electronic business is a relatively new field on the Internet but since its inception, the growth has been remarkable. Experts believe that international e-commerce will be leading the economy in the coming years. The global economy has changed after the introduction of digital technology. Many business terms have been redefined to better suit the needs of the economy. For instance value creation now does not rely on physical goods anymore. It focuses on services, intelligence, and information as the chief sources for creating value for the customers. The researchers have identified certain stages or attributes in e-commerce. Exchanging digital information between parties is the primary stage.   

Case Study on McDonalds Example | Topics and Well Written Essays - 500 words

On McDonalds - Case Study Example The business model implemented has enabled the firm to consistently offer restaurant experiences that are relevant to the local customers and become part of the local communities. A swot analysis of McDonald’s is as below. McDonald has developed a very strong global grand and is highly ranked by Fortune Magazine in its category. It has also successfully portrayed itself as community oriented and socially responsible company that caters for the different cultures it serves. Strong global market presence is another key strength that is barked with the franchise business model that has made it easy to expand and manage the vast locations without much ease. The company’s location strategy also works for its business i.e. most stores are excellently located in parks, airports and Wal-Mart stores as well as other prime places. Its adherence to guidelines on safety of food and provision of nutritional information to its customers also helps in growing customer intimacy. A major weakness of McDonald’s has to do costs of doing business; it has to expend lots of money on training as a result of high staff turnover. It has also concentrated a lot on the fast foods such as burgers instead of the more healthier and organic food types. Its franchise model of operation also faces concerns to with quality as the different franchise owners may not offer the same level of quality. A concern to investors arises from the large variations in the company’s profits while its limited variation of seasonal foods impacts on customer confidence. McDonald’s therefore needs to address these weak points in order to maintain its brand recognition. Due its global position and the franchise business model the company has unique opportunity to further expand to every part of the globe. It can also grow its image by responding fast social changes and customer demands in terms of health. Its Wifi service

Analyze and assess the significance of Francis Bacon's New Atlantis Essay

Analyze and assess the significance of Francis Bacon's New Atlantis - Essay Example The New Atlantis may not be considered as a work of literature comparable to the classics that were produced during that time. However, the Baconian or scientific method which it asserts on is the most important content that has been serving as the framework for the succeeding experiments and practical scientific activities. It is apparent that without the Baconian method explicitly outlined, The New Atlantis would certainly be less relevant as a book of science. Neither would it even be significant as a literary work of fiction. The focal point that Bacon wishes to portray in The New Atlantis is that if his scientific method is applied scientists, it would be possible to construct a society similar to that in a fictional land which he called Bensalem. Such a society as described by Bacon is actually a utopia. Nevertheless, it clear that what he wants to impress on the readers is that a utopian society is possible for as long as the scientific method that he is proposing would be put to practice in all fields of science, be it natural, physical, or social. It is apparent in the novel though that even as Bacon insists on a certain framework for establishing scientific truths, he never goes to the extent of negating the very essence of the supposed antithesis of science: religion. In fact, even as Bensalem’s inhabitants and leaders follow a precise scientific method, they retain their belief in the supernatural. As a consequence of adhering to a system of studying scientific truths and applying these in governing Bensalem, the inhabitants in this society are described by Bacon to be very contented with their lives. The problems of hunger and strife common in societies in Europe are virtually non-existent; a utopia no less. In the world outside Bensalem, people have to work in order to obtain the most basic necessities. Satisfied with their economic conditions, they no longer desire to earn more than what they are already getting. A Bensalem inhabitant who welcomed the sailors said that â€Å"he must not be twice paid for one labor† (Bacon, 2007, p.7). Since he is already paid by the State for the service he offers to the guests, he explains that he should no longer accept anything from the guests themselves. Such gesture may be construed as honesty but such attitude would certainly not be developed if want and misery exist in Bensalem. It is clear that the society of Bensalem as described by Bacon is governed by what may be considered as an ideal welfare state. There are no private businesses mentioned all throughout the story. It is the state that ensures that the people are provided for according to their needs. The office governor of the House of Strangers articulates this when he tells the sailors that â€Å"ye shall also understand that the strangers’ house is at this time rich and much aforehand; for it hath laid up revenue these thirty-seven years, for so long it is since any stranger arrive in this part; and th erefore take ye no care; the State will defray you all the time you stay† (Bacon, 2007, p.11). It is evident here that Bacon’s utopian Bensalem bears the semblance of the society dreamt by the early socialists. However, it is also important to point out that this kind of society would not be possible if its level of economic advancement has not been bolstered by an accurate system in discovering scientific tru

Research Methods in Engineering Assignment Example | Topics and Well Written Essays - 1250 words

Research Methods in Engineering - Assignment Example Twitter and web globalization go hand in hand. Many companies are getting Twitter accounts. According to Yunker (2009),"ICANN[, a major company,] recently launched its own Twitter feed. And since ICANN is a global organization, it launched more than one language feed - one in English and one in Spanish." Twitter is exploding at an astounding rate. According to Pence (2007), "Some have called the current generation of college students the Web generationThe pace of technology change continues to quicken. The effects of globalization and social networking have not yet had their full impact." Indeed, this is a social media revolution that will not be underestimated. Pence (2007) says that "the media revolution is changing so fast that in a decade we will be dealing with college-age students as different from today's college students as current college students are different from their teachers." Supposedly, social media networks such as Twitter build community trust in the online community. Barton et. al. (2009) "the operation of trust and inspiration in networking and teamwork [is a key] to become change agents in small groups and networks. This research sheds light on the mechanisms by which the process of e-learning adoption relies on social networks and connections. Thus, as one can see, social media plays an important role in today's globalized world. It is obvious that the more follower and, thus, influence, one has on Twitter, the more leverage electronic engineers have to harness the power of Twitter for globalization of their organization. Innovative approaches to technology in the globalization industry will have a great impact on the engineering field. Wineman et. al. (2009) says that , "the knowledge bases of social network [indicate the] preliminaryeffects ofsocial network structure and the support of innovation." B. Problem Definition The problem that will be analyzed is how to increase global influence on Twitter with electronic engineering technologies. C. Project Description and Significance This project will be accomplished through the creation of a survey for Twitter users regarding what an electronic engineer should do in order to help his or her company become more globalized. Section 2: Factors Influencing the Project A. Research Design: Survey Development The survey to be developed will incorporate the information of Twitter users with 500 or more followers on twitter (up to about 3 million or so) in order to facilitate what kind of knowledge is needed to spread globalization for one's company as an electronic engineer. B. Data Sources As mentioned in the section above, specific Twitter users will be queried, based on how many followers they have. The survey will basically cover people who are from various age ranges, socioeconomic backgrounds, and professions. The minimum amount of followers required (500) is set so that the survey administrator knows that the person being surveyed has at least some modicum of influence on Twitter. If necessary, peoples' usernames can be entered in the

Theory of the Derive Essay Example | Topics and Well Written Essays - 1000 words

Theory of the Derive - Essay Example Thus, it quotes from social and city observers about characteristics of derive, such as that of Chombart de Lauwe (1952),who described, â€Å"an urban neighborhood is determined not only by geographical and economic factors, but also by the image that its inhabitants and those of other neighborhoods have of it,† (Debord, 1952, P 5). It then provides the viewer – the derive actor – a thought, interpretation, or meanings. When it comes to nature, many forms of derive may be obtained, and contrasting thoughts and impressions may be formed depending on where or what the viewer may go through. While it is possible to describe a natural environment as â€Å"untouched† by humans, it no longer applies to being â€Å"undisturbed.† Human activities already altered much of nature, touched and untouched. Indirectly, no stones have been left unturned, so to speak. However, this does not limit nor impede nature derive for one who remains optimistic. One sees many aspects of visual representations: line, shape, balance, form, symmetry, asymmetry, volume, color saturation, contrast and unity. In the exploration of line, some of nature’s products are seen with straight, almost straight, and even curvy lines from tree trunks to leaf features. Many are repetitive, forming symmetry and unity. If one goes deeper, one may inspect the bamboo trunk, with fibers of lines, thousands of them per stem. These can be separated and still form lines like the one seen on synthetic fabrics as is they were engineered to be such. Perhaps, they were engineered by higher forms to be such. Bamboos are structural materials, or even materials for fabrics as is. Bamboo Fiber. Source: Wikipedia, 2011. When it comes to shapes, many representations are sky-inspired. There are the sun, moon and stars, with the moon forming several shapes in the span of a month. There are snowflakes, raindrops, even lightning. Mountains are often pyramidal, or triangular, imitated b y human dwellings with their rooftops. There are oblong fishes, and billions of leaves with thousands of variations. Then there are rocks of varieties of spherical shapes, odd and common. The light that emanates from some of these rocks also inspire their own shapes: say a diamond. We will never get enough of flora’s balance and form. Perfect radiances of flower petals, a center with its attractive colors and forms, and shapes, or even volumes of stigma, anther, and filaments that have for thousands of years attracted many derive experiences. It is how they have occupied important roles in human interaction and survival. In fact, even in afterlife. Flowers represent to humans a lot of things, generally positive and celebratory. It melts anger, pain, and sorrow. It unites, welcomes, refreshes, cheers, consoles, applauds. Flowers have performed well and good to the human experience they continue providing derive experiences of immeasurable pleasure until now. Source: http://flo wers-show.com/ But derive is not all about optimist impressions. As mentioned earlier, there are also negative aspects of natural environment derive experiences which had been influenced by human â€Å"‘touch†, whether nature liked it or not. Through greedy consumption, mindless disposal and major economic activities, nature in many aspects of its existence have been negatively affected by humans. Take for example the latest sea oil spill. Take a look at what volume may mean below: (Source:

Therapeutic Approaches Essay Example for Free

Therapeutic Approaches Essay At the present, the contemporary society has discovered and created many new therapeutic strategies in dealing with psychological problems and health maladies. These therapeutic approaches are developed in relation to the different psychological discipline focusing on the different aspects and realms of the human mind. Some of these approaches are proven effective to many however, some are also ineffective to particular patient. Because of this, it has been determined that part of the effectivity of a certain therapeutic approach is based on the conformity and acceptance of the patient to the therapy and vice versa on some cases. In this aspect that this author finds a certain specific therapy that he or she is comfortable with. This patient sees the humanistic therapeutic approach to be more convenient and suitable compare to other therapeutic services that are being offered. This opinion can be said mainly because of the optimistic and positive outlook of this therapy to the human nature particularly its patients. In this approach, the said therapy provide a more personal in-depth realization as it try to focus on the positive aspects of the human nature namely the patient’s neglected strengths and abilities as it was empowered by weakness and insecurities. Compare to other therapeutic approaches, the humanistic view provide a strengthening outlook to the personal life thus promoting the therapy’s benefit to a long-term advantage for the patient. Other approaches can be said to be only focused on determining the roots of the patient’s problem thus, they only show the inconsistency of the human nature. However though, most patients know already their inconsistencies thus they become depress and gloomy as they accept it. However, the humanistic therapy can show the other side of their personality making the patients realize again that amidst their misdeeds and faults, there is still a good personality that is innate within their being.

Electro Physiology of the Human Heart

Electro Physiology of the Human Heart Introduction This chapter is the first chapter in the thesis which gives introduction of the present study. The chapter defines electro physiology of human heart, blood circulation in both pulmonary and systemic in detail, the components in cardiovascular system and heart sounds. It explains in detail the generation of potential due to mechanical activity of human heart and sounds produced due to closure of valves during blood pumping from atrias to ventricles and to respective parts of the body. This chapter presents a detailed survey on literature focusing on different methods to measure and analyse ECG and PCG. Electricity plays an important role in medicine. The control and operation of nerves, muscles and organs are functioning by the electricity generated inside the body. The forces of muscles, the action of brain and all nerve signals to and from the brain are caused by the attraction and repulsion of electrical charges. Many electrical signals are generated to carry out the special functions of the body. These signals are the result of electrochemical action of certain type of cells. The best known signals are electrical potentials of nerve transmission and the electrical signals observed in electromyogram (EMG) of the muscle, the electrocardiogram (ECG) of the heart and the electroencephalogram (EEG) of the brain. One means of obtaining diagnostic information about muscles, heart and brain are to measure their electrical activity. The record of the potential from muscles during movement of is called the electromyogram (EMG). The rhythmical action of the heart is controlled by an electrical signal initiated by spontaneous stimulation of pacemaker cells located at apex of the right atrium i.e. sinoatrial node (SA node). The recording of hearts potentials on skin is called electrocardiogram (ECG). The recording of the electric signals due to electrical activity of neurons in the cortex of the brain is called electroencephalogram (EEG). The present study is to study the electrical activity of heart during its mechanical vibrations. The primary step in investigations of physiological systems requires the appropriate sensors to transducer the phenomenon of interest into a measurable electric signal. The field of biomedical has advanced to the stage of practical application of signal processing and pattern analysis techniques for efficient and improved non- invasive diagnosis. 1.1 Physiology of Heart and Vascular System The analysis of variability in cardiovascular signals is applied widely and many experimental setups were put forward. Spontaneous fluctuations can be observed in cardiovascular function, such as heart rate and blood pressure, even when the environmental parameters are maintained at a constant level as possible and no perturbations influences can be identified. The observations of heart rate fluctuations is related to various cardiovascular disorders, the analysis of heart rate variability has become widely used tool in the assessment of the regulation of heart rate behavior (Timo Makikallo 1998). The study of cyclic variations of heart rate plays an important role in the assessment of both physiological and clinical aspects (Narayana Dutt Krishnan 2000). The heart is actually two separate pumps. A right heart that pumps the blood through the lungs and left heart pumps the blood through the peripheral organs. Each of these composed of atrium and ventricle. Atrium receives the blood and pumps into ventricles. Ventricles supply the main force that circulates the blood either through pulmonary circulation by the right ventricle or through the systemic circulation by the left ventricle(Fig 1.1) The blood, blood vessels and heart make up the cardiovascular system (CVS). The blood and its supply of oxygen are so important to the body that the heart is the first major organ to develop in the embryo. The mechanism in the heart provides cardiac rhythmcity and transmits action potentials through the heart muscle to cause the hearts rhythmical beat. The cardiac event that occurs from the beginning of the next are called the cardiac cycle. Each cycle is initiated by spontaneous generation of an action potential in the Sino atrious node or Sinus node. The cardiac cycle consists of a period of relaxation called diastole, during which the heart fills with blood fallowed by a period of contraction called systole together is known as a beat. The heart is composed of three major types of cardiac muscle; atrial muscle, ventricular muscle and specialized excitatory and conductive muscle fibers. Cardiac muscle is a syncytium of many heart muscle cells which are interconnected with intercalated discs which are of actually cell membranes separates cardiac muscle cells from one another and offers low resistance to ions to diffuse through cells. If one of these cells is excited, the action potential spreads to all of them. The heart is composed of two syncytiums the atrial syncytium that consists of walls of two atria and ventricular syncytium consists of the walls of two ventricles. The atria are separated from the ventricles by tissue that surrounds the atrio-ventricular valvular openings. Potentials are conducted from atrial syncytium into ventricular syncytium through the specialized conductive system called A-V bundle a bundle of conductive fibers. The division of the muscle of the heart into two functional syncytiums allows the atria to contract a short time ahead of ventricular contraction, which is important for effective heart pumping through lungs and peripheral organs. Another importance of the system is that it allows all portions of the ventricles to contract almost simultaneously, which is essential for most effective pressure generation in the ventricular chambers The cardiac cells present in the heart tissue are individually surrounded with an insulating membrane (supporting a potential mV) containing selective permeable ionic channels. The currents through these channels interact with the membrane potential to regulate the activity of the cell. The flow of various ions (Na,K,Ca etc) through out the cardiac tissue is responsible for the propagation of the electrical waves through tissue in turn provides the driving force behind the hearts mechanical contraction and its ability to pump blood through the body. 1.2. Components of Heart The heart is a conical, hollow muscular organ placed obliquely behind the body of the sternum and adjoining parts of the body of the costal cartilages, so that 1/3 rd of it lies right and 2/3 rd to the left of the median plane. The heart measures about 12x9cm and weighs 300 gm in males and 250 gm in females. The human heart has four chambers as shown in fig 1.2. The upper two chambers, the right and left atria are receiving chambers of blood. Atria collects venous blood from the body and about 75% of the blood flows directly into the ventricle even before atrial contraction. The atrial contraction causes an additional 25% filling the ventricles. The hearts lower chambers right and left ventricles are the powerful pumping chambers. The right and left sides of the heart are separated from each other by a wall of tissue .each side pumps blood through a different circuit of blood vessels. 1.2.1. The Right Atrium It is the right upper chamber of the heart receives venous blood from the whole body and pumps it to the right ventricle through right atrioventricular (tricuspid) opening. The chamber is elongated vertically, receiving the superior vena cava at the upper end and the inferior vena cava at the lower end. Deoxygenated blood from the whole body feeds into two large veins, the superior vena cava and inferior venecava, which empty into the right atrium of the heart and the same pumps to the right ventricle. 1.2.2. The Right Ventricle The right ventricle is a triangular chamber which receives blood from the right atrium and pumps it to the lungs through the pulmonary trunk and pulmonary arteries. Externally, the right ventricle has two surfaces anterior and inferior. The cavity of the right ventricle is crescent in section because of the forward bulge of inter ventricular septum. The wall of the right ventricle is thinner than that of left ventricle in a ratio 1:3. 1.2.3. The left atrium The left atrium forms the left 2/3 of the base of the heart and is a quadrangular chamber. It receives oxygenated blood from the lungs through four pulmonary veins and pumps it to the left ventricle through Mitral valve. 1.2.4. The Left Ventricle The left ventricle receives oxygenated blood from the left atrium and pumps it into the aorta, the bodys largest artery. Smaller arteries that branch off the aorta distribute blood to the various parts of the body. It forms the apex of the heart .The cavity of the left ventricle is circular in cross section and has the thickest walls nearly half an inch in an adult because it must work the hardest to propel blood to the farthest reaches of the body. 1.2.5. Valves of the Heart The valves of the heart maintain unidirectional flow of the blood and prevent blood from flowing backward in the heart i.e. the valves open easily in the direction of blood flow, but when blood pushes against the valves in the opposite direction the valves close. There are two pairs of valves in the heart i) atrio ventricular valves ii)Semilunar valves. Atrio-ventricular valves are located between the atria andventricles as shown figure. The right atrio-ventricular valve is formed from three cusps of tissue and is called Tricuspid valve. While the left atrio- ventricular valve has two cusps and is called Bicuspid or Mitral valve. Both valves are made up of a fibrous ring to which the cusps are connected .The cusps are flat and project into the ventricular cavity. The atrio- ventricular valves kept competent by active contraction of the papillary muscles. Semi lunar valves are located between the ventricles and arteries and each of them consist of three half moon shaped flaps of tissue. They are not attached to fibrous ring but are to the blood vessel .The right semi lunar valve between right ventricle and pulmonary artery is pulmonary valve and the valve between left ventricle and aorta is aortic valve .These valves are closed during ventricular diastole. 1.2.6. Superior Vena Cava It is about 7 cm long venous channel which receives blood from the upper half of the body and empties it to the right atrium like other large veins. It has no valves. 1.2.7. The Aorta The aorta is the great arterial trunk which receives oxygenated blood from the left ventricle and distribute it all parts of the body. 1.2.8. Myocardium It is the muscle tissue wraps around a scaffolding of tough connective tissue to form the walls of the heart chamber. The atria the receiving chambers of the heart have relatively thin walls than the ventricles, the pumping chambers. 1.2.9. Pericardium It is a tough, double layered sac which surrounds the heart. The inner layer of the pericardium is known as epicardium rests on top of the heart muscle. The outer layer is attached to the breast bone and other structures in the chest cavity and helps hold the heart in place. The space between the two layers of the pericardium filled with watery fluid which prevents these layers from rubbing against each other during heart beat. 1.2.10. Endocardium It is the inner surface of the hearts chambers lined with a thin white sheet of shiny tissue. The same type of tissue also lines the blood vessels forming continuous lining throughout the circulatory system. The lining helps blood to flow smoothly and prevents clotting of blood in the circulatory system. The heart is nourished not by blood passing through, but by the blood vessels also known as coronary arteries which encircle the heart like a crown. About 5% of the blood pumped to the body enters the coronary arteries, which branch from the left ventricle .Three main coronary arteries the right , the left circumflex and the left anterior descending nourish different regions of the heart muscle. From these three arteries small branches arise to provide a constant supply of oxygen. 1.3. A Detailed Description of Vascular System The cardio vascular system is concerned with the transport of blood and lymph through the body. It may be divided into four major components, the heart, the macro circular i.e. blood vessels arteries and veins, micro circular i.e. capillary and lymph vascular system i.e. water and other components of blood plasma. The cardio vascular system (CVS) controls the blood pressure by altering the heart rate and compliance i.e. elasticity of blood vessels. (Isla Gilmour 1995). 1.3.1. Arteries Arteries transport blood from high pressure to body tissues as their structure permits them to expand and contract under different pressures due to the presence of elastic fibers. The main artery of the heart is aorta, which starts from the left ventricle transporting oxygen and nutrients to all body tissues. The presence of elastic fiber enables the arteries to expand when each pulse of blood pumped by the heart and regains its original shape when tension is released. Like all blood vessels the inner layer of arteries is known as tunica intima, composed of a single layer of flattened endothelial cells fitted together to form a smooth, continuous tube. In large arteries the same layer is supported by thick band of elastic fibers. The middle layer is known as tunica media consisting of smooth muscle and elastic fibers. In very large arteries the outer layer is known as tunica adventitia also contains elastic fibers and connective tissue. 1.3.2. Veins Veins transport deoxygenated blood at low pressure toward the heart and act as reservoirs of different capacities to maintain a steady return of blood to heart. The veins of systemic circulation terminate at bodys largest veins superior and inferior vena cava which empty into the right atrium of the heart. The walls of the veins are thinner and contain little elastic fiber with greater internal diameter. These structural properties help them to stretch and store the blood. Since the pressure in veins is low some structural changes is needed to prevent blood from downward pull of gravity. The veins in the lower body contain special one-way valves prevent the accumulation of blood in the legs and feet. During exercise the muscles are in extremities, relaxing and contracting alternately squeezing the veins to force the blood upward towards the heart. The tunica media of veins is thinner and contain less elastic fiber and smooth muscle to function at low pressure and serving as reservoirs to maintain a steady return of blood to the heart. 1.3.3. Arterioles The functions of arterioles are to distribute the blood and pressure reducing valves. They play an important role in determining the blood pressure. The arterioles have smooth muscle in their walls and do not stretch rather act as pressure reducing valves between the arteries and capillaries. They prevent delicate capillaries from high pressure of blood in the arterial system. The degree of muscular tension in the walls of arterioles decides their internal diameter in turn changes the resistance of blood flow in arterioles. As they affect the blood pressure because they account for a large component of the peripheral resistance to blood flow. Blood pressure is the product of total peripheral resistance and cardiac output. 1.3.4. Venules The function of venules is to drain blood from the capillary bed into the venous system. 1.3.5. Capillaries Capillaries are very small blood vessels their diameter ranges from 4-15 ÃŽ ¼m. The sum of the diameters of all capillaries is significantly larger than that of the aorta which results in decrease of blood pressure and flow rate. Capillaries are composed of a single layer of flattened endothelial cells fitted together to form a continuous tube. This results in a very large surface to volume ratio. The low rate of blood and large surface area facilitate the functions are * Providing nutrients and oxygen to the surrounding tissue. * The absorption of nutrients, waste products and carbon dioxide and * The execution of waste products from the body. 1.3.6. Lymphatic Vessels Parts of the blood plasma will execute from the blood vessels into the surrounding tissues because of transport across the endothelium. The fluid entering tissues from capillaries adds to the interstitial fluid normally found in the tissue. The surplus of liquid will return to the circulation .Lymph vessels are dedicated to this unidirectional flow of liquid, the lymph. The lymph vessels can be divided into three types depending on their shape and size. Lymph Capillaries These are larger than blood capillaries and very irregular on shape. They begin as blind ending tubes in connective tissues. Lymph Collecting Vessels They appear almost similar to lymph capillaries but a bit large and form valves. The lymph is moved by the compression of the lymph vessels by surrounding tissues. The direction of lymph flow is determined by the valves Lymph Ducts They contain one or two layers of smooth muscle cells in their wall and form valves. The walls of lymph ducts are less elastic and during contractions contribute to the movement of lymph towards the heart in addition to the compression of the ducts by surrounding tissues. 1.3.7. Relations to Other Systems and Organs The heart and vascular system perform almost the same function to provide oxygen, nutrients and harmonic to the cells of the body tissue. They can be considered as one unit rather than two, because each is equipped to carry out half of that function. The vascular system is also closely related to the adrenergic receptors and the autonomic nervous system, which together control important aspects of its function. The alpha adrenergic receptors are the smooth muscle cells in arteries, veins, arterioles and venules. These receptors bind molecules released by cells of the autonomic nervous system and respond by contracting. 1.4. Blood Circulation -Systemic and Pulmonary The heart basically a double pump provides the force to circulate the blood through two major circulatory systems, the pulmonary circulation in the lungs and the systemic circulation is in organ system that transports substances to and fro from cells. The blood in normal individual circulates through one system into before being pumped by the other part of the heart to the second system. The heart is a muscle composed by cells containing small filaments of actin and myosin. These proteins interact in the sense of forming actomyosin during muscle contraction, thus leading to the main purpose of the heart: pumping the blood through the circulatory system (Manuel Duarte Ortigueiva 1959). The synchronous nature of contraction of heart results in the efficient pumping of blood through the pulmonic and systemic circulation (J.Olansen et al 2000). The circulatory system can be thought of as a closed loop circulation system with two pumps. One way valves keep the flow downward through the pumps. 1.4.1. Systemic Circulation The heart ejects oxygen rich blood under a pressure about 125 mm Hg from main pumping chamber left ventricle, through the largest artery the aorta. Subdivided into smaller arteries in turn divided into even smaller arteries called arterioles and finally into a very fine meshwork of vessels called the capillary bed. Capillaries permit to dissolve oxygen and nutrients from the blood to diffuse across the fluid, known as interstitial fluid that fills the gaps between the cells of tissues of organs. The dissolved oxygen and nutrients enter cells through interstitial fluid by diffusion across the cell membranes. Mean while carbon dioxide and other wastes leave the cell diffuse through the interstitial fluid, cross the capillary bed and enter the blood. The blood collects in small veins called venules gradually join together to form progressively larger veins. Finally the veins converge into two large veins, the superior vena cava and the inferior vena cava bringing blood from upper half and lower half of the body respectively. Both of these main veins join at the right atrium of the heart. 1.4.2. Pulmonary Circulation The deoxygenated blood returning from the organs and tissues of the body stored momentarily in the reservoir i.e. right atrium, during weak contraction (5 to 6 mm Hg) the blood pushed into the right ventricle. On the next ventricular contraction this blood is pumped at a pressure of about 25 mm Hg through pulmonary arteries to the capillary system in the lungs. At this site microscopic vessels pass adjacent to the alveoli or air sacs of the lung where it exchanges oxygen from the membrane to the blood and leaves carbon dioxide from blood to the same membrane. The freshly oxygenated blood then travels through the main veins from the lungs into the left reservoir i.e. left atrium of the heart. During weak arterial contraction (7 to 8 mm Hg) blood enters the left ventricle. On the next contraction of the left ventricle sends blood to the aorta and then to general circulation. On average a typical adult has about 4.5 lts of blood and each section of the heart pumps about 80 ml in each contraction. About 30 sec to 1 min is needed for the average red blood cell to complete a full circuit through both the pulmonary and systemic circulation. The blood volume is not uniformly divided between the pulmonary and systemic circulation. At any one time 80% of the blood is in the systemic circulation and 20% is in the pulmonary circulation. Of the blood in the systemic circulation about 15% is in the arteries, 10% is in the capillaries and 75% is in the veins. In the pulmonary circulation about 7% of the blood is in the pulmonary capillaries and the remaining is almost equally distributed between the pulmonary arteries and pulmonary veins. 1.4.3. Additional Functions In addition to oxygen, the circulatory system also transports nutrients derived from digested food to the body. These nutrients enter the blood from the walls of the intestine carries the nutrients to the liver for farther metabolic processing. The liver stores variety of substances such as sugar, fats and vitamins and releases glucose to the blood as needed. The liver also cleans the blood by removing waste products and toxins. After the blood is cleaned, enter the veins converge to form the large vein that joins the vena cava at right atrium. The circulatory system plays an important role * In regulating body temperature * To collect chemical messengers called hormones from hormone producing glands and transports to specific organs and tissues to regulate bodys rate of metabolism, growth, sexual development and other functions. * With immune system and coagulation system, the immune system is a complex system of many disease fighting white blood cells and anti bodies circulate in the blood and are transported to sites of infection. The coagulation system is composed of special proteins called clotting factors which circulate in the blood. When ever blood vessels are cut to torn, the coagulation system works rapidly to stop the bleeding by forming clots. Other organs support the circulatory system are the brain and the parts of nervous system constantly monitor blood circulation, sending signals to the heart or blood vessels to maintain constant blood pressure. New blood cells are produced in the bone marrow and old blood cells are broken down in the spleen, where iron and other minerals are recycled. Metabolic waste products are removed from the blood by kidneys which also screen the blood for excess salt and maintain blood pressure and to maintain blood pressure and to balance minerals and fluids of the body. 1.5. Heart Diseases Heart disease has become very common nowadays due to changes in life style. Many of these diseases are due to either increase the work load of heart or reduce the ability to work at normal rate. 1.5.1. Tachycardia There are many factors that are responsible for development of heart disease. One such factor is High blood pressure (Hypertension) which causes the muscle tension to increase in proportion to the pressure. A fast heart rate (Tachycardia) increases the work load. 1.5.2. Heart Attack The heart disease that causes most deaths is heart attack. A Heart attack is caused by blockage of one or more arteries to the heart muscle. During and after heart attack the ability of the heart is seriously impaired. Bed rest and giving oxygen reduces the work load on heart which increases the oxygen content in the blood so that blood pumped by the heart will be less. Alternate method to reduce risk of heart attack is the regular exercise program which opens alternate routes in cardiovascular system. 1.5.3. Congestive Heart Failure Another common disease is congestive heart failure which is due to enlarge in size of the heart reduce the ability for adequate blood circulation. Applying law of Laplace, if the radius of the heart is doubled, the tension of the heart muscle should be doubled which in turn reduces the efficiency of the heart muscle to maintain the same blood pressure. Since the heart is stretched it may not be able to produce sufficient force to maintain normal circulation. Stretched heart muscle is less efficient than the normal. It consumes much more O2 for the same amount of work. 1.5.4. Bradycardia Patients with inadequate electrical signal in the heart muscle will affect the work load of heart. The artrioventricular node i.e. between Atria and Ventricles is fatty and does not conduct electric signal and ventricle receive no signal from Atria, but being natural pacing centers which provide a pulse. The resulting heart rate is 30 beat/min i.e. Bradycardia results semi invalidism. 1.5.5. Pace Makers If hearts electrical signals are inadequate to stimulate heart muscles, artificial pace makers are available. To improve the quality of life of faulty atrioventricular nodes, artificial pacemakers are developed. The pacemaker contains a pulse generator that put out 72 beats / min. The pace maker is put just below the right collarbone. It lasts for 2 years and impervious to body fluids and do not cause tissue reaction. 1.5.6. Valve Defects Another heart disease is defective heart valves. These are of two types. 1) The valve either does or opens wide enough (stenosis). In stenosis large amount of work is to be done by heart to obstruct the narrow opening. 2) It does not close well enough (insufficiency).In insufficiency some of the pumped blood flows back and the amount of blood in circulation is reduced .Both types can be replaced by artificial valves. 1.5.7. Cardiovascular Diseases Aneurysm Some cardiovascular diseases involve the blood vessels. An aneurysm is a weakening of the wall of an artery which results increase in its diameter in turn increases the tension in the wall proportionately. If it is ruptured in brain, a type called Cerebrovascular accident (CVA). A more common blood vessel problem is the formation of sclerotic plaques on the walls the artery which causes turbulence in blood flow increases the blood velocity at that point with a decrease in wall pressure due to Bernoullis theorem. A Disease in Varicose Vein Veins with defective valves which allow the blood to flow backward become enlarged or dilated to form the varicose veins. During walking or other exercise, the contraction of the muscle forces the venous blood toward the heart called venous pump. At various points along the veins there are one way flaps or valves that prevent the blood from going back. If these valves become defective blood run backward and pool up in the vein becomes varicose. The standard treatment for varicose veins is surgical removal of the offending vessels. There are sufficient parallel veins to carry the blood back to the heart. Stiffness of RBC Membrane In some cases, mainly in smoking, the membrane of RBC s becomes stiff. There may not be normal flow of blood in the vascular system. Blood may become viscous leading to Thrombosis. 1.6. Electrophysiology of Heart The rhythmical action of the heart is considered by an electrical signal initiated by spontaneous stimulation of special muscle cells located in the upper right hand corner of the right atrium near the superior vena cava. This area is known as sino atrial node (Fig 1.5). Cardiac electro physiology is dedicated to the study of the electro chemical activity of the heart. Studies include electrical activation of individual cells as well as the system- level activation, which results in normal or abnormal heart rhythm. (J.Olansen et al 2000). The complex system found by the Autonomous Nervous System (ANS) and the heart is modeled as if it was a modulation system, where the first generates a signal that modulates a sequence of pulses which excite the heart (Manuel Duarte Ortigueira et al 1959 ). The sinus rhythm fluctuates around the mean heart rate, which is due to continuous alteration in the autonomous neural regulation i.e. sympathetic and parasympathetic balance. Periodic fluctuations found in heart rate originate from regulation related to respiration, blood pressure (baroreflex) and thermoregulation (Pauli Tikkanen 1999). Cells in the SA node generate their electrical signal more frequently than cells else where in the heart. These impulses spread rapidly through inter nodal pathways to Atrioventricular node (AV node). At this node the signal is delayed so that all muscle cells of the atria contract virtually in unison. Now the impulse conducts through fibrous connective tissue between atria and ventricles known as Atrio ventricular bundle (AV bundle). AV bundle conducts the signal through left and right bundles of Purkinje fibers which conduct the cardiac signal to all parts of the ventricles. 1.5.Fig. Electrophysiology of the heart. 1.6.1. Sinoatrial Node The sinoatrial node is a small, flattened ellipsoid strip of specialized muscle about 3 mm wide, 15 mm long and 1mm long located at the upper right hand corner of the right atrium immediately below and slightly lateral to the opening of the superior vena cava. The Sinoatrial (SA node), the atrioventricular (AV node) and the Purkinje system can be regarded as potential pacemaker tissues in heart. As the fastest depolarization impulse spreads through the conduction system to other pacemakers before they spontaneously depolarize, the sinoatrial node usually defines heart rate (Pali Tikkanen 1999 12). The sinus nodal fibers connect directly with the atrial muscle fibers, so that any action potential generates at the sinus node spreads immediately to the atrial muscle wall. For this reason Sinoatrial node is also known as pace maker of the heart. It generates the impulse at the rate of about 70/min and initiates the heart beat. However this rate may increase or decrease by the demand of blood supply to the body. Three types of membrane ion channels play an important role in causing the voltage charges the action potential. They are 1) fast sodium channels 2) slow calcium-sodium channels 3) potassium channels. As the ions move in muscle cells in fractions of second creates action potential at the Sinoatrial node. This can be observe

Green Energy Means Renewable Energy Environmental Sciences Essay

Green Energy Means Renewable Energy Environmental Sciences Essay Green energy means renewable energy that is vast alternative for the use of fossil fuels such as petroleum. Other conventional method used to provide electricity is such as geothermal, biomass, ocean, solar, wind, hydro, hydrogen fuel cells and etc. Biomass energy is derived from the wastes and animal dung either by burning it or just leaving the wastes to lay off by itself to get biofuel or biogas. Ocean energy is gained from the sea and there are two types of them such as thermal energy and mechanical energy. Hydrogen must go through reformation process or electrolysis process to be able to use for the fuel cells to provide electricity. The objective of the project is to choose seven types of renewable energies and explain its applications and advantages in detail. 1. Introduction Green energy is sustainable energy, which means meeting the needs of the present without compromising the future[2]. These alternative energy sources are said to be not harmful to humans and environment and also arenon polluting energy sources. It basically reduces pollution and the impact on the environment that the existing energy source is causing now and in the past by conventional energy sources such as fossil fuel, coal and wood. These are non renewable energy sources, also known as the brown energy[1]. These sources are mainly used in the production of electricity, heating and fuel for boilers. They cause excessive amount of pollutants, such as carbon monoxide and nitrogen oxides, together with particles that could harm humans. These pollutants are the main contributors to the greenhouse gases that cause global warning. Brown energy are also types of sources that are typically reducing on our earth, which means it could not be re-produced to be used in future. The main aim for this study on green energy is to literate the reader on what is green energy and the importance of these energy to substitute our current conventional energy resources. These report is also to identify the main types of green energies available for the current technology practised in our world today with the history of energy development that brought to the practice of green energy. 2. Green Energy Sources of green energy come from the nature itself, being free to be harvested. They are mainly derived from the sun (solar power), wind and water. Wind turbines have been used since old times to grind grains, where the term windmill is derived from. A more expensive source would come from nuclear and bioenergy (biofuel and biogas). Nuclear power is also categorized in green energy as it does not produce greenhouse gases. Waste from nuclear power plants are problematic and dangerous to be handled as it takes hundreds to thousands of years to decay before reaching the level that is not harmful to humans, plants and the animals. But in order to completely wipe out the usage of fossil fuels to produce electricity, the number of nuclear plants has to be increased so that greenhouse gases emissions can be cut down massively.[3] Energy from sun, wind and water are continuous but inconsistent. Rainy days that could affect solar power production and droughts that would affect water levels in dams are the main drawbacks of these energy sources. As renewable energy is sometimes inconsistent, excellent storage capacity is needed to store energy that are produced. It is usually windier in the night time, but the demand would be lesser. Nuclear plants generate so much power at a particular time that they cannot be used at once. So large battery banks are required in order to mesh with the electricity system and provide a consistent power supply. 2.1 History of Energy Development The history of energy consumption of human being dates back to 3000 BC where the Mesopotamians used petroleum to caulk ships and to build roads. Coals were used during the Bronze Age to heat up iron and shape them, as well as in the Roman culture. This long history of non-renewable energy usage has urged the emergence of green energy to replace them in order to keep the future generation safe.[4] 2000 B.C. Crude oil was used to light lamps and heat up homes by the Chinese. 200 B.C. Salt produced from brine using natural gas from underground by Chinese. 600 B.C. Static Electricity found by Thales of Miletus by rubbing amber. 250 400 A.D. First water-powered Mills built by the Romans 600 A.D. Greek Fire was invented by the Persians and Arabs, a form of burning liquid used greatly in the Byzantine Empire as weapon. 500 900 A.D Windmills were built to pump water and grind grains by the Persians. Late 1500s Coal was imported greatly by US, up to 108,000 tons until the 1800s. 1700s A kite that transmitted electricity through its wet cord was found by Ben Franklin. A breakthrough in electricity discovery. 1800-1826 US had the first electric utility. Mid 1800s-1950 Wood as the primary source of fuel, but decreased after the shift back to coal. 1870-1880 Gas and alcohol using first combustion engine. First U.S. power plant to produce electricity opened (Thomas Edisons Pearl Street Station) 1888 First wind turbine generating electricity in Cleveland, Ohio. Early 1900s Geothermal used to produce electricity commercially by the Italians 1938 Nuclear Fission discovered by the Germans. 1940-1950 The Atomic Energy Act implementation and the first electricity were produced by using nuclear power. 1950s First silicon solar cell was invented (solar photovoltaic). 1960s National Environmental Policy Act and Clean Air Act in US implementation to protect the environment and reduce pollution. 1970s Department of Energy (DOE) were formed. Water from power plant was controlled with Clean Water Act in 1972. 1974 Development of renewable energy was initiated and supported by the National Renewable Energy Laboratory. 1980s First wind farm built in the United States.2.2 Giga watts of power produced in California. 1990s Natural gas was used in almost 50percent of homes in US for heating. Towards the Greener Solution Till 2007, 24 states adopted policies for increasing the production of renewable energy. 2.2 Importance of Green Energy Research from scientific evidence are showing that what this present generation is doing will impact the environment in the next 50 100 years. The fact that only one earth is known by human being urges government and private sectors to find solutions to reduce pollution and having a lifestyle that is more eco-friendly. A few reasons on why green energy is important. Non renewable fossil fuels burning are causing greenhouse gases that cause global warming. Carbon dioxide, methane and nitrogen oxides are released into the atmosphere, dissolving into raindrops and causing acid rains. Acid rains damages crops, plants and forests. Aquatic organisms are also affected by this as lakes and rivers pH levels are altered. Human built structures such as steel bridges, marble statues and limestone buildings are being eroded by acid rain.[10] Figure 3 is a pie chart showing the anthropogenic greenhouse gas emissions in the U.S. by gas type. Fossil fuels such as oil and coal are also supply that is not endless. Sooner or later the supply will vanish and unavailable for future generations. Wind, water and solar energy are constant, sustainable and 100 percent clean energy. It does not cause negative impact on environment such as pollutant and waste. This energy type is free as well. Humans would benefits in health as reduced pollutants would provide cleaner and more breathable air. Lands would be saved as waste management is not necessary. Cleaner water for domestic usage and aquatic organism a would be available. Jobs opportunity would arise in rural areas as most renewable energy plants are located far from cities. Regional development also would benefit from this.[8][9] 3. Types of Green Energy 3.1 Biomass Biomass is derived from farm wastes, animal wastes, plant oils, crops and some kind of garbage [11]. Energy that is generated from the wastes is called bio power or bioenergy [11]. Biomass can be processed further to obtain biofuels or burned directly to obtain bioenergy[11]. The energy obtained from burning the wastes can be converted into heat, electricity and mechanical energy [1]. 3.1.1 Types of biofuels Solid form its obtained from the burning of organic material such as animal wastes, wood, grain and other types of garbages [11]. Liquid form- its obtained straight from the plant and does not involves any burning of material [1]. Biodiesel can be taken as an example for this type of form. It is extracted from vegetable oils or animal fats [11]. Gas form its obtained from organic waste such as dead plant and animal wastes when the organic material breakdown naturally without the need of oxygen [12]. Biogases consist of methane that is essential in terms of natural gas [12]. 3.1.2 Application of biomass Widely used in transportation in the form of gases Electricity generation plants Gas produced from the biomass gasifier must be cleaned first before cooling it down and use it as a fuel to run an IC engine that is coupled together with the generator [13]. Heat application Biomass is used as a fuel to provide energy for the fuel-fired furnace that is often used for high end outputs such as[13 ]: Forging furnace Ovens Kilns Dryers Small boilers Direct fire process heater Re-rolling mills 3.1.3 Benefits of biomass energy Biogases that are used as fuels gives more mileage for cheaper price compared to fossil fuels Energy from biomass has got no ending to it since human throw wastes in daily basis and animals also constantly produce muck Energy gained from burning the wastes releases carbon dioxide to the atmosphere and the carbon dioxide that is released from the burning is useful for the plants in terms of photosynthesis process. Each country has their wastes in terms of plants, animals dung and garbages, these materials is available locally. This can reduce the need for foreign investors in the country thus improve the nation economically as well Biomass in mass production can reduce the increase in global temperature significantly. 3.2 Ocean energy Ocean energy is gained from the sea. There are two types of energy gained from the ocean such as thermal energy and mechanical energy [15]. Thermal energy is gained by the difference in temperature between the warmer surface of the ocean and the deep cold ocean water [15]. Mechanical energy is gained from tidal and wave that is used to rotate the turbine to provide electricity in most of the power plants available [15]. 3.2.1 Types of energy gained 3.2.2 Thermal energy The difference between the temperatures should be around 38 Degree Fahrenheit in order to build a power plant that can fully utilize this temperature difference to make energy [16]. There are 3 types of cycles involved in electricity conversion system from the heat energy such as: Closed cycle The heat at the surface of the ocean water is used to vaporize an ammonia type of fluid which has low boiling point and the vapor expands to turn the turbine to produce electricity [15]. Open cycle The sea water in this case is kept at low pressure in order to force it to boil at low temperature and the steam produced from the sea water is then used to rotate the turbine to activate the generator to produce electricity[15]. Hybrid The combination of both open and closed cycles is used to rotate the turbine in a most economical way [15] 3.2.3 Mechanical energy Tidal energy its gained as the earth rotates and the gravitational pull of the moon. The principle of tidal energy is when the tides is at high point the water is trapped in the dam and as the tides began to reach the low point, the trapped water is released to rotate the turbine at high speed to generate electricity[15]. The concept is similar to hydroelectric power plants [6]. Wave energy Existing kinetic energy from the movement of the waves is used to power up the turbine [15]. The concept is simple that the waves from the ocean comes into the chamber from the right, as the rise of the waves will force the air to release from the chamber and the released air is the one that will rotate the turbine to provide electricity as shown in the figure 1 below[16]. The higher the waves, higher are the rotation of the turbine. http://www.energyquest.ca.gov/story_old/images/chap14_wave_2007.gif Application of wave energy [16] 3.3 Hydrogen and fuel cells energy Hydrogen best identified as the simplest component [18]. One proton and one electron are the sub elements inside an atom of hydrogen [18]. It has a limitation is that it doesnt appear by its own in the earth. Hydrogen atom always combined together with other elements such as water [17][18]. The molecular weight of hydrogen is 1kmol and the lightest weigh among all the other natural components available in earth. Hydrogen can be separated from hydrocarbon by heating process and this is called reformation process [18]. Electric current also used to separate hydrogen from water and the separation process is called electrolysis [18]. Fuel cells function is to convert hydrogen to electricity directly without any other processes in between [18]. Reformation of methanol, gasoline and natural gas can provide hydrogen for the usage of fuel cells [18]. Methanol can be used directly for some fuel cells without any reformation process [18]. 3.3.1 Applications of hydrogen and fuel cells NASA used liquid nitrogen as a fuel for the space shuttles and other rockets. Liquid nitrogen does not emit any harmful material after the combustion [18]. The product of the conversion by hydrogen fuel cells is pure water that is used as drinking water by the astronauts [18]. Hydrogen powered vehicles is among the growing applications of energy since hydrogen fuel cells capable of providing power for buses[21]. Fuel cells also can provide electricity for a residential housing area that is big as a traditional AC unit [21]. It can operate 24 hours a day and 7 days a week. 3.3.2 Advantages of fuel cells Efficient conversion of energy from hydrogen to electricity without any combustion taking place and the byproduct is water[19][20] The noise level created from an operation of a fuel cell relatively much more quiet than the conventional motors[20] Easier maintenance since less moving parts[20] Life span is longer than a battery since it has no memory effect when its refueled[10] The source for fuel cells are hydrogen and it is available with water[20] Can reduce the nations usage of fossil fuels since fossil fuels come at higher price than hydrogen that is naturally available in the earth [20]. 3.4 Geothermal Energy Geothermal energy is a form of thermal energy stored by generation of heat from radioactive decay of minerals occurring inside the earth (80 percent) and from the original formation of the planet (20 percent).[6] Due to the temperature differences between the earth core and surface, continuous heat transfer occurs from the core to surface. Radioactive decaying of natural materials such as uranium and potassium that occurs at the core creates a temperature reaching over 5000 degree Celsius and very high pressure.[7] This high temperature and pressure causes melting of surrounding cooler rocks and these results in the formation of magma. This magma then heats up the rocks and water in the crust which can go up tp 370 degree Celsius.[6] In the range of 10kilometers of earth surface contains heat energy that is 50000 times more than all the oil and natural gas sources in the world.[7] The typical place that usually spots geothermal activities is regions with active volcanic activities. T his usually occurs at places where the earth crust is thin enough to let the heat out. Earthquake and magma movements breaks up the rocks covering and allows water to circulate, producing natural hot springs and geysers as the heated up water reaches the surface. As these hot and pressured water forms a reservoir type of containment underground, wells are usually constructed to harvest electricity or heat. 3.4.1 Applications Steam produced from the reservoir containing pressured and hot water are usually used to power turbines in power plants that generates electricity (Steam Turbine), while other power plants uses the hot water in the reservoir to boil a working fluid that vaporizes and moves a turbine. Heat produced by hot water near to the earth surface can be directly used for heating purpose. The applications that utilizes these direct heat includes heating buildings and homes purpose, growing plants in greenhouses, drying crops, heating water at fish farms, and also in pasteurizing milk processes at milk industries. This is done by using geothermal heat pumps. There is also formation of hot dry rocks, usually 4-10kilometers from earth surface. Technologies is existing to inject cold water onto these hot dry rocks, circulating them through the cracks of the rocks and drawing back the heat from another well located at the end of the water circuit.[5] http://www.bbc.co.uk/schools/gcsebitesize/science/images/131_geothermal_energy.gif Water pumped down through injection well and collected at production well. http://www.ucsusa.org/assets/images/ce/geopower3.gif How geothermal heat used to power turbines. 3.5 Hydropower Hydro means water, so hydropower basically is the power that derived from the force of moving water and generates electricity at damn by water falling throughout the turbines. [22] The fall of water and movement is part of a constant ordinary cycle known as water cycle. Water in the earths ocean and rivers evaporates by energy from the sun and draws it ascendant as water vapour. Once the water vapour reached the cooler air in atmosphere, it automatically abbreviates and forms as clouds. [23] Hence, the moisture fall to earth as rain and fill the water in oceans and rivers. The moving of water from higher ground to the lower ground with the gravitational force and it drives the water extremely powerful to assist generates electricity for daily usage of human being.[23] Hydropower is a one of the worlds biggest source of renewable energy and play important role or facing challenges during period of climate vary. [24] Hydropower also is considering clean energy source because it does no t release any toxins to damage the environment. [25] Figure 3.1: Water cycle diagram 3.5.1 Types of Hydropower Hydropower is primarily used to generate electricity. There are few types of hydropower which is common usage in world. Micro hydro: provide few hundred kilowatts to remote villages, homes and small industries.[26] Pumped-storage hydroelectricity: stores the water that has been pumped during low demand and generates it when demand is high.[26] Run-of-the-river hydroelectricity: it will capture the kinetic energy in rivers without using dams.[26] Conventional hydroelectricity: power comes from the potential energy of dammed and water drives the turbine to generate electricity.[27] The most common type of hydropower that has been used is conventional hydroelectricity known as hydroelectricity power plant which is uses a dam on a river to store water in a reservoir. This power station is usually placed in hill areas so can build dams easily and can obtain larger water reservoir and generate huge quantity of electricity. [28] 3.5.2 How is hydroelectricity power produced?http://cwc.gov.in/Kids%20Corner_files/hydropower.gif Figure 3.2: Simple Hydropower station diagram In hydropower station, the potential energy that stored in body of water at a given height is converted to kinetic energy which is used to rotate the turbine and produce electricity. [28] In the generation of electricity by using hydroelectric power, water is accumulated or stock up at higher level and guide descending through large pipes to lower level known as penstock. [29] Once the water reaches the end of the penstock with higher pressure it will hits and drives the turbine to create mechanical energy from kinetic energy. Turbines rotate the connected to shaft which is turn the generator and change mechanical energy to electrical energy. [9] Inside the generator there is rotor that covers by turbine. Large electromagnets are attached to the rotor located within coils of copper wires called as stator. Flow of electrons is formed in the coils of stator when a generator rotor spins the magnets. [31] This produces electricity that can be step up in voltage through the station transformers and centre cross transmission lines. Therefore, transmission line conducts electricity from hydropower plant to the distribution system. There are certain advantages and disadvantag es of using hydroelectric power station: Advantages It is constantly renewable remaining to the habitual nature of the hydrologic cycle. The water that been used for generation of electricity can be utilize for irrigation, boating and fishing, kayaking and etc. Fuel is not burned so there is minimal pollution and no waste is produced Using water to run the power plant that provided free by nature Disadvantages Only at limited places hydropower plant can be constructed. Dams are expensive to build. Possibility of dam collapsing 3.6 Solar energy Solar energy is the radiant energy emitted by the Sun that is converted into thermal or electricity energy for homes and industry usage. The amount of energy falling on the earth is given by the solar constant, but very little use has been made of solar energy. [32] Renewable and sustainable energy source such as solar energy make use of it around the world to produce electricity for number of different purpose and its use is both environmentally-friendly and cost-effective over the long term. There are varieties of technologies that have been used to take benefits of solar energy. Types of technologies such as photovoltaic system is common have been used to develop solar energy for daily and powering numerous applications. [33] Photovoltaic system (PV) is solar cells or panels directly convert sunlight into electricity. [34] The conversion of sunlight directly into electricity (DC) will be done by solar cells. Electricity from solar cells is stored in the battery for instant or future usage and where an inverter is required to change the Direct Current (DC) to Alternating Current (AC) to power the most AC appliances. [35] Photovoltaic system solar cell made of semiconducting materials that related to those used in computer chips. Once the rays are engaged by these materials, the solar energy knocks electrons loose from the atoms, via allowing the electrons to flow through the material to produce electricity. This process of converting light (photon) to electricity (voltages) is called as photovoltaic (PV) effect. [36] The simple of photovoltaic (PV) system illustrated in figure below that can explain about it.A diagram of how the components of a PV system interact with each other. Figure: Simple Photovoltaic (PV) system with components The electricity that generated can be stored or directly utilize by photovoltaic standalone system, or a huge electricity grid powered supplied by central generation plants (photovoltaic grid-tied system), or else joint with single or numerous domestic electricity generations to supply into small grid (photovoltaic hybrid system). [37] Supplying of DC and/or AC electrical load that operate independently of the electric utility grid is designed by standalone photovoltaic system. Direct-coupled system is of the simplest type of standalone photovoltaic system that the DC output of a module or array is directly connected to a DC load (figure). [38] When there is no electrical energy stored in batteries in direct-coupled system, the load can operates during the sunlight. So, common applications that used for example water pumps, ventilation fans and small circulation pumps for solar thermal water heating systems are appropriate. [38]A diagram of a stand-alone photovoltaic system. Figure: Direct coupled PV system Hybrid system only integrates more than one generating source, which may use an engine-generator, wind, or utility power as a supplementary power source. Initially the battery store is recharged by the photovoltaic system once insufficient the generator charges the batteries. Solar Hybrid System Figure: Photovoltaic hybrid system Grid tie photovoltaic system is deliberate to work with utility grid power. Direct Current (DC) power from the Photovoltaic array into Alternating Current (AC) power is converted by the inverter. AC appliances or local utility company can make use of the direct AC power.Solar Grid-Tie System Figure: Photovoltaic Grid Tie system 3.7 Wind Energy Wind energy is the renewable power or energy which comes from the air that flowing across the earths surface. Wind energy is a converted form of solar energy. [40] Wind is exist due to uneven heats of the atmosphere by sun, the irregularity of the earths landscape and rotation of the earth.[41] Movement of air from region of higher pressure level to region of lower pressure level is also known as wind. When hot air increases, the atmospheric pressure will reduce at earths exterior, and the cooler air will travel in to fill up the void. In fact, flow of wind patterns are personalized by earth landscape, vegetative cover and bodies of water. One of the fastest growing sources of electricity and fastest growing markets in the world today is wind energy because is green power, sustainable, affordable, and economic development. [42] In wind turbines there are consist of horizontal and vertical axis wind turbines been designed for rotation function. 3.7.1 How a wind energy or wind turbine is work? Terms of wind energy or else wind power illustrate the generation of mechanical power or electricity by using wind. Air has mass when it is in motion, and it contains the energy of that motion, known as kinetic energy. [40] Therefore wind turbines are usually use to harvest the kinetic energy and convert it by using inverter into utilizable which can provide electricity for home, business applications and for sale to utilities. Wind turbine also produce mechanical energy that harvested from kinetic energy to drive machinery, for instance grinding grain and pumping water, the device called as windmill or wind pump in rural place. wind energy diagram Most common method to generate electricity is by using wind turbines. Figure 1 is explaining the simple understand on working principle of wind turbines. Explanation from the figure 1, wind will turn the large turbine blades; the turning energy will spins a generator shaft and produces electricity. The electricity that produced by wind turbine is Direct Current (DC) and it cannot use because household appliances and use Alternating Current (AC). Hence, inverters connect to wind turbines to the mains power of a building and used to convert the DC electricity into useable AC electricity. [43] Small-scale of wind energy does not use inverters, as an alternative using the wind energy electricity can be charge batteries, connected to buildings main power or else connected to national power grid. [44] Advantages There are no fossil or fuels required to generate electricity [45] Wind energy does not pollute at all so does not harm environment or discharge any toxic gases[7] Wind energy directly can be used as mechanical energy[47] Disadvantages Once there is no wind, solar energy or geothermal energy use as alternative way to generate electricity [48] Need expensive storage throughout peak production time.[49] Requires large scale area to build wind farm.[49] 4. Conclusion Green energy is the only visible solution so that the future generations are not compromised