Defining And Understanding Holography Physics Essay

Defining And Understanding Holography Physics EssayHolography,methodofobtaining three-dimensional ruptureic images. These images are obtained with away a lens, so the method is withal called lensless photography. The records are called holographs (Greek holos, whole gram, message). The theoretical principles of holography were authentic by the British physicist Dennis Gabor in 1947. The prototypical actual issue of holograms took place in the early 1960s, when the laser became available. By the late 1980s the production of true-color holograms was possible, as well as holograms ranging from the microwave to the X-ray region of the spectrum. ultrasonic holograms were also being made, using sound waves.Holographyis one of the remarkable achievements of a modern science and technology. Holograms have unique property to restore the high-grade volumetrical image of real subjects. The war cry holography originated from the Greek words holos whole and grapho write, that means comp lete record of the image.Holography represents photographic process in a broad scent out of this word, essentially differs from a usual photo because there is a registration not onlyintensityin a photosensitive material, only if alsophaseof light waves, scattered by the object and carried the complete information about three-dimensional structure of the object. As the medium of mapping of the reality, hologram has unique property unlike usual photo, theholographic image so-and-so reproduce exactly three-dimensional copy of the original object. Such image with set of medical prognosiss, change with change of supervision, has amazing realness and often looks like the real object. Unlike photography or painting, holography can render an object with complete dimensional fidelity. A hologram can create e verything your eyes see size, shape, texture and relative position. However, if you try to touch a holographic image, all youll find is focused light. bill of holographyHolography i s known from 1947 when British (native of Hungary) scientist Dennis Gabor produced the theory of holography tour he was trying to improve the resolution of electron microscope .Gabor coined the term which we know today i.e. holography by the greek word holos, which means whole while gramma means message. Further development in the field was during the next period because light sources available at that date was not truly coherent .This problem was overcome in1960by Russian scientistsN. BassovandA. Prokhorovand American scientistCharles Townswith by the invention of the laser, whose pure, intense light was ideal for devising holograms. In that year the pulsed-ruby laser was developed by Dr.T.H. Maimam. This laser system(unlike the continuous wave laser normally used in holography) emits a very powerful burst of light that lasts only a a few(prenominal) nanoseconds (a billionth of a second). It effectively freezes movement and poses it possible to produce holograms of high-speed events, such as a bullet in flight, and of living subjects. The first hologram of a person was made in1967, paving the way for a specialized practise of holography pulsed holographic portraiture.In1962Emmett Leith and Juris Upatnieks of the University of Michigan recognized from their work in side- understanding radar that holography could be used as a 3-D visual medium. In 1962 they read Gabors paper and simply out of curiosity decided to duplicate Gabors technique using the laser and anoff-axis techniqueborrowed from their work in the development of side-reading radar. The result was the first laser transmissionhologram of 3-D objects (a toy train and bird). These transmission holograms produced images with clarity and realistic depth but required laser light to visual modality the holographic image.Their pioneering work led to standardization of the equipment used to make holograms. Today, thousands of laboratories and studios possess the necessary equipment a continuous wave l aser, optical devices (lens, mirrors and beam splitters) for directing laser light, a film holder and an isolation table on which exposures are made. Stability is absolutely essential because movement as small as a quarter wave- length of light during exposures of a few minutes or even seconds can completely spoil a hologram. The basic off-axis technique that Leith and Upatnieks developed is still the staple of holographic methodology.Also in1962Dr.Yuri N. Denisyukfrom Russia combined holography with 1908 Nobel Laureate Gabriel Lippmanns work in natural color photography.Denisyuks approachproduced a white-light reflection hologram which, for the first time, could be viewed in light from an ordinary incandescent light bulb.Another major advance in display holography occurred in1968when Dr.Stephen A. Bentoninvented white-light transmission holography while researching holographic television at Polaroid Research Laboratories. This type of hologram can be viewed in ordinary white light creating a rainbow image from the seven colors which make up white light. The depth and brilliance of the image and its rainbow spectrum soon attracted artists who adapted this technique to their work and brought holography further into public awareness.Bentons invention is peculiarly significant because it made possible mass production of holograms using an embossing technique. These holograms are printed by stamping the interference pattern onto plastic. The resulting hologram can be duplicated millions of timesfor a few cents apiece. Consequently, embossed holograms are now being used by the publishing, advertising, and banking industries.In1972Lloyd Crossdeveloped the integral hologram by combining white-light transmission holography with unoriginal cinematography to produce moving 3-dimensional images. Sequential frames of 2-D motion-picture footage of a rotating subject are recorded on holographic film. When viewed, the composite images are synthesized by the human brainpo wer as a 3-D image.In 70s Victor Komar and his colleagues at the All-Union Cinema and Photographic Research Institute (NIFKI) in Russia, developed a prototype for a projected holographic movie. Images were recorded with a pulsed holographic camera. The developed film was projected onto a holographic screen that focused the dimensional image out to several points in the audience.Holographic artists have greatly increased their technical knowledge of the discipline and now contribute to the technology as well as the creative process. The art form has become international, with major exhibitions being held throughout the world.The commonly and widely used way of imaging of the reality is the photography. A photograph is basically the recording of the differing intensities of the light reflected by the objectand imaged by a lens. However, information about dimensions of the object contained not only in amplitude (intensity), but also in a phase of light waves.A great difference between holography and photography is the information recorded. This difference is why photographs are twain dimensional (2-D) images while holograms are three dimensional (3-D) images. Photographs contain only one view point of an object. Our eyes need a minimum of dickens view points in order to see depth. Vision using two viewpoints of an object is called stereoscopic vision. Each eye receives a slightly contrasting view point of an object, our brain combines the two and we perceive depth. We can fool our eyes into seeing photographs in three dimensions by taking two slightly different views of an object and allowing each eye to see only one image, the right image for the right eye and the left image for the left eye. We can do this with a stereoscope (for pictures) or with polarized glasses (for movies). The shortcoming of stereoscopic images is that when we move our head from side to side or up and down, we still only see the kindred two view points, whereas we should be seeing con tinuously changing viewpoints of the object. The image therefore doesnt quite appear to be three dimensional. In order to make a record of a three dimensional object we need to record this continuous set of viewpoints of the object.Estimating sizes of the objects and considering shapeand direction of shadows from these objects, we can create in our mind general representation about volumetric properties of the scene, represented in a photo. But, if sizes of the objects are identical and there are no shadows, volumetric bailiwick of the photographed scene is completely lost. For example, we can not define in the photo of snowflakes on a dark background, which of them is closer, and which of them is farther.Holography is the only visual recording medium that can record our three-dimensional world on a two-dimensional recording medium and playback the original object or scene to the unaided eyes as a three dimensional image. The image demonstrates complete parallax and depth-of-field and floats in space either behind, in front of, or straddling the recording medium.

Impact of Airports Political, Environmental and Social

Impact of Airports Political, Environmental and SocialAirports play an important sparing role within their local communities. Airports serve a epochal role in the economic shaping of the communities of which they serve ascribable to the sheer actuality that they atomic number 18 among the largest existence facilities in the world. It is well understood that a viable and efficient conveyance of title agreement is a fundamental and necessary comp atomic number 53nt to the rescue of either constituent (Wells Young, 2004).Although there is no doubt that the bearing of an glowport has great positive carry ons on a surrounding community from an economic standpoint, the presence of an aerodrome, very much equal any large industrial complex, unfortunately impacts the community and surrounding natural environment in what many consider a negative manner. These effect be a result of activity whose solutions is the haloport itself and of vehicles, as well as both advertisecr aft and ground vehicles, which travel to and from the var.drome (Wells Young, 2004).Examine the political, environmental and social impact an airdrome has on its local community. Analyze some rules and regulations that govern environmental impact activities, and explain how their strategies help satisfy the take of the local communities while maintaining adapted airport trading operations. De terminaline and evaluate the role technology plays in mitigating the risks and reducing the environmental impacts created by airport activity. Determine if a relationship exist surrounded by community economic growth indicators and airport activity.Program Outcome addressed by this app bent movement.1. P.O. 1 Students will be able to apply the fundamentals of air transportation as part of a global, multimodal transportation system, including the technological, social, environmental, and political aspects of the system to examine, compare, analyze and recommend conclusion.A literary re view will analyze the environmental impacts of airports on the surrounding communities in which they serve. An evaluation of environmentally related complaints filed against aviation activity and reported to the FAA will determine the closely significant environmental impacts associated with airports. Predicting the futurity of the global multimodal air transportation system is impossible without first understanding the local role and responsibility of each component of the air transportation system. This question will show evidence of satisfying the Program Outcome by demonstrating how the social, economical, political, and environmental fundamentals of an airport are an integral part of the air transportation system, and how these factors contribute to the relationship that an airport has with its surrounding communities.Research and AnalysisAirports serve a significant role in the political, economic, and social shaping of the communities of which they serve due to the sheer ac tuality that they are among the largest public facilities in the world.Political RolesA major commercial airport is a huge public enterprise. near are literally cities in their own right, with a great variety of facilities and operate (Wells Young, 2004). Although the administrative functions and responsibilities of these facilities are governed by public entities, airports are also comprised of private dispositions. Commercial airports essential be operated in cooperation with the air carriers that provide air transportation service and all airports must work with tenants, much(prenominal) as concessioners, fixed-based operators (FBOs), and separate firms doing business on airport property. This amalgamation of public charge and private enterprise fashions a unique political role for airport management (Wells Young, 2004).Airline carrier-airport relationships.One of the some prominent and essential relationships in the aviation industry is the airport skyway relationship. When viewing the relationship from the airlines standpoint, an airport is a point along their course system for the purpose of enplaning, deplaning, and transferring passengers, cargo, and freight. To facilitate effective and efficient operations, the airlines necessitate specific facilities and services at each airport. The specified requirements of the airports are as varied and unique as the airlines who request them however, they scarcely remain stagnant, as they are ever changing and evolving to come over the needs of traffic demands, economic conditions, and the competitive climate. Before airline deregulation in 1978, response to changes of this sort was slow and mediated by the regulatory process. Airlines had to apply to the Civil Aeronautics Board (CAB) for permission to add or dispatch routes or to change fares. CAB deliberations involved published notices, comments from opposing parties, and sometimes hearings that could take months, even years, and all members of the airline airport community were aware of an airline carriers intention to make a change long before they received permission from the CAB (Wells Young, 2004). The Deregulation Act of 1978 enabled air carriers to change their routes and fares without awaiting the approval of the CAB. umpteen of these changes occurred on short notice, thus causing airline necessities and requirements at airports to change with haste.Contrary to the viewpoints of air carriers, which operate at multiple airports over a route system connecting many cities, airports concentrate on accommodating the interests of a variety of users at a solitary location. Airport operators and managers endure the strenuous task of ensuring that they meet all the demands and requirements of their airline carriers while maintaining their resources. Due to the rapidly changing specifics of each airline carrier, airports often find their services and facilities needing improving or refurbishing, requiring major cracking exp enditures or even making obsolete an already constructed facility. Airport operators and managers must exercise diligence and caution in realizing that they accommodate and must meet the needs of other tenants and users besides the airline carriers, and must ensure that the airports landside facilities are effectively and efficiently utilized. Although the landside facilities are of minimal importance to the airline carriers, their efficiency can badly have an effect on and be affected by their operations.Despite their notably different perspectives, airline carriers and airports share the collective objective of making the airport a successful and established economic venture in which both parties can benefit and prosper from. Traditionally the relationship between the airline carriers and airports has been formally fused through with(predicate) the use of airport user agreements which establish the circumstances and methodology for establishing, calculating, and collecting usage fees and charges. These agreements are also used to identify the rights and privileges of air carriers, sometimes including the right to approve or disapprove any major proposed airport capital development projects (Wells Young, 2004). Residual cost airports, or airports where two or more air carriers assume financial risk by agreeing to pay any cost of running the airport that are not allocated to other users, typically have longer-term use agreements than compensatory airports, with agreements of terms of 20 or more years and terms of 30 years or longer not being uncommon. On the other hand, only approximately half of compensatory airports, or airports in which the airport operator assumes the financial risk of running the airport and charges the air carrier fees and lease rates set so as to recover the actual costs, have agreements running for 20 years or more, with many of the compensatory airports having no contractual agreements any(prenominal) with the airline carriers (We lls Young, 2004).Concessionaire-airport relationships.Another zippy relationship which attributes to an airports success is the relationship between the airport and the concessionaires. This is due to the fact that the majority of airports rely on their concessionaires in direct to generate a considerable amount of their non-aviation related revenues. Airports maintain management contracts and concession agreements with the concessionaires who provided the airport with services and facilities such as banks, restaurants, hotels, car rental companies, position facilities, bookstores, bars, gift shops, taxi services, and business centers. The context of these agreements varies to a great extent however, they typically extend the various concessionaires the privilege of operating on the property of the airport in exchange for the greater payment of either a minimal annual fee, or a percentage of the revenues. These agreements can vary from departure to outlet at the same airport de pending upon location, nature of business, forecast turnover and whether or not the outlet is new (Francis et. al, 2004). The tenure of each agreement between the airport and the various concessionaires and the financial circumstances affixed to each will vary by airport and concessionaire. The length of the contractual agreement is dependent upon an array of criteria, with one of the most important being the level of investment required from the retailer. If little investment is required then a contract is often short term however, if any substantial level of investment is required from the retailer then a contract of five years would be considered the minimum (Freathy OConnell, 1999).A concessionaire who is often overlooked when speaking of concessionaire, despite its critically important role, is the fixed based operator (FBO). FBOs generally provide services for airport firms, users, and tenants lacking facilities of their own, typically through fuel sales, and aircraft repair, service, and maintenance facility operations. The contracts and agreements between airport operators and FBOs vary due to FBOs constructing and developing its own facilities on airport property in some cases, and FBOs simply managing facilities belonging to the airport in other cases.In addition to concessionaires, some airport authorities serve as landlord to other tenants which may tarry and operate on airport property such as industrial parks, freight forwarders, and warehouses, all of which can provide significant revenue. It is the responsibility of airport management to maintain fruitful political relationships with all tenants, by ensuring reasonable lease fees, contract terms, and an overall mix of tenants that meet the needs of the airport and the public it serves (Wells Young, 2004). oecumenic aviation-airport relationships.In contrast to airline carriers and concessionaires, contractual agreements are rarely used to characterize and solidify the relationships between a irport operators and general aviation (GA). GA is a diverse group which can be comprised of GA aircraft owned and operated by an assortment of organizations and individuals for a miscellaneous number of leisure, business, or instructional purposes. Agreement when they are in place, are seldom long term due to the variety and diversity of owners and aircraft type and use. Airport facilities, in particular storage space such as hangars and tie-downs, are often leased from the airport with the airport playing the role of landlord in a landlord-tenant relationship. Thus, at the airport, the primary needs of GA are parking and storage space, along with facilities for fuel, maintenance, and repair. Whereas as air carrier might occupy a gate for an hour to deplane and enplane passengers and load fuel, a GA user might need to have property space to park an aircraft for a day or more (Wells Young, 2004).Airport-public relations.Indubitably, one of the most vital and challenging relationship s that an airport must foster and maintain, is the relationship between the airport and its community it serves. The overall goal of the airport must be to create gracility and a positive reputation for the airport and its products, services, and ideals with the community, who can affect its present and future welfare. Without regards to the size, location, or activity scope of an airport, every airport four publics in which it must deal with. These publics include the 1) external business public, which includes all segments of the business, government, educational, and general flying public the 2) external general public, which is all the local citizens and taxpayer, many of whom have never been to the airport but who vote on airport egresss or who represent citizens groups with particular concerns the 3) internal business public, which includes the businesses and enterprises who interests are tied directly to the airport-the airlines, FBOs, other members of the GA community, gov ernment officials, and other aviation and travel-oriented local businesses and trade organizations, and the employees of all these enterprises and the 4) internal employee public comprised of everyone who works for the airport and its parent organization (Wells Young, 2004). Like any other facility that is a part of and serves the total community, the airport requires total understanding by its community and publics, and must ensure that it creates an environment and atmosphere of ken and acceptance.Airport regulatory policies.The airport has many organizations who are profoundly interested in their operations, and in developing and preserving airports due to their role in the national air transportation system and their value to the communities and publics they serve. The primary goal of these groups is to provide political support for their causes with hopes to influence federal, state, and local laws concerning airports and aviation operations in their favor (Wells Young, 2004 ). Some of the most prominent groups include the Aerospace Industries tie-up (AIA), the Aircraft Owners and Pilots Association (AOPA), the Air Line Pilots Association (ALPA), the Airports Council foreign-North America (ACI-NA), the Air Transport Association of America (ATA), the American Association of Airport Executives (AAAE), the air Distributors and Manufacturers Association (ADMA), the Experimental Aircraft Association (EAA), the Flight Safety Foundation (FSF), the General Aviation Manufacturers Association (GAMA), the Helicopter Association International (HAI), the International Air Transport Association (IATA), the National Agricultural Aviation Association (NAAA), the National Air Transportation Association (NATA), the National Association of State Aviation Officials (NASAO), the National Business Aviation Association (NBAA), the Professional Aviation Maintenance Association (PAMA), and the Regional Airline Association (RAA).Economic RolesUnquestionably, airports are econ omic locomotives and a reflection of the community, publics, and region in which they reside, serve, and represent. Transportation, by definition, provides the ability for people and goods to move between communities, thus treying to trade and commerce between markets, which in turn, lead to jobs, earnings, and overall economic benefit for a communitys residents (Wells Young, 2004).Transportation role.Despite the fact that there are numerous modes of transportations, to include automobiles, trains, trucks, and ships, air travel has had a significant impact on trade and commerce that is absolutely unrivaled by any other transportation mode. In comparison to their sister modes of transportation, travel in the aviation system allows substantial amounts of passengers and cargo to travel internationally in relatively short periods of time, resulting in communities garnering extraordinary and exceptional economic benefit through providing them access to various world-wide markets.Stimul ating economic growth.The airport has become vital to the growth of business and industry in a community by providing air access for companies that must meet the demands of supply, competition, and expanding marketing areas. Economic impacts of airports are measured according to direct impact and indirect, or induced, impact. Directs impacts include the economic activities carried out at the airport by airline carriers, airport management and operators, FBOs, and other firms, and tenants with a direct involvement with aviation. Airports and the agencies and tenants that directly impact the airports represent a major source of employment for their various outlying communities, with the wages and salaries earned by the employees of airport-related business having a significant direct economic impact on the local communities frugality by providing the means to purchase goods and services while generating tax revenues as well. local payrolls are not the only measure of an airports eco nomic benefit to the community. In addition, the employee expenditures generate successive waves of additional employment and purchases that are more difficult to measure, yet nevertheless substantial (Wells Young, 2004).Total Airport Earnings and Employment (Earnings in Millions)Category Earnings JobsSalaries $208.91 4,870Local Fuel Purchases $3.99 237Local Non-Fuel Purchases $4.23 252Rent $18.35 723Equipment Purchases $1.39 82Utilities $8.07 318Contractual Services $41.77 1,647State Taxes $10.16 125Local Taxes $27.42 338Other spend $73.14 901Hotel Spending $42.20 2,234Construction $19.11 743Total $458.74 12,471* Totals may not add due to roundingTable 1 Louis Armstrong New Orleans International Airport (MSY) 2004 earnings and employment. interpreted from MSY 2004 Airport ReportIn addition to the direct economic impact generated by the airport, the outlying communities receive indirect, or induced, impact generated by economic activities by on-airport businesses and off-airport b usiness activities associated with the airport through-put, such as hotels, gas stations, restaurants, and travel agencies, as well their roles in facilitating trade and tourism, among others. The airport also indirectly supports the local economy through the use of local services for air cargo, food catering to the airlines, aircraft maintenance, and ground transportation on and around the airport, as regular purchases of fuel, food, goods, supplies, equipment, and other services permeate additional income into the communities surrounding the airport. The local economys tourism and business convention industry can also receive economic growth and substantial revenues indirectly impacted by the airport through air travelers patronage and use of hotels, restaurants, retail stores, sports and night clubs, rental cars, and local transportation, among others.Beyond the benefits that an airport brings to the community as a transportation facility and as a local industry, the airport has become a significant factor in the determination of real farming values in adjacent areas. Land located near airports almost always increases in value as the local economy begins to benefit from the presence of the airport. Land developers consistently seek land near airports, and it follows inexorably that a new airport will inspire extensive construction around it (Wells Young, 2004). enumerate TAX REVENUE CREATED (In millions of $s)CATEGORY INCOMEStateDirect $9.95Income $7.18Selective Sales $7.52General Sales $8.90Business $2.48Total State $36.04Local Sales $10.57Local Direct $23.83Local Property Taxes $0.97Total Local $35.38State Plus Local $71.41* Totals may not add due to roundingTable 2 MSY Tax revenue created 2004. Taken from MSY 2004 Airport ReportAirports are a major force and contributor to the local, regional, and national economy with an impact that goes well beyond the actual physical boundaries of the airport. As cargo and passenger reach out to rise, and infrastru cture continue to improve, the importance and impacts of airports as economic catalyst will also continue to increase.Environmental RolesAlthough there is no doubt that the presence of an airport has great positive impacts on a surrounding community from an economic standpoint, the presence of an airport, much like any large industrial complex, unfortunately impacts the community and surrounding natural environment in what many consider a negative manner. These effects are a result of activity whose sources is the airport itself and of vehicles, as well as both aircraft and ground vehicles, which travel to and from the airport (Wells Young, 2004).Noise Impacts.Conceivably the most noteworthy environmental impact associated with airports is the commotion emanated by the taking off and landing of aircraft, with engine maintenance and taxiing aircraft following closely behind. The impact of such disturbance on communities is usually analyzed in terms of the extent to which the noise annoys people by interfering with their normal activities, such as sleep, relaxation, speech, television, school, and business operations (GAO, 2000). According to a 1978 study that has become the generally accepted model for assessing the effects of long-term noise exposure, when sound exposure levels are measured by the method that assigns additional weight to sounds occurring at night (between 10 p.m. and 7 a.m.), and those sound levels exceed 65 decibels, individuals report a noticeable increase in annoyance (Schultz, 1978). There is increasing evidence that high exposure to noise has adverse psychological and physiological effects and that people repeatedly exposed to gaudy noises might exhibit high stress levels, nervous tension, and inability to concentrate (Wells Young, 2004).Since the beginning of aviation, airports have always had conflicts with their neighboring communities however, noise did not become an issue until the 1960s introduction of the commercial jet. It is estimated by the Federal Aviation Administration (FAA) that between 1960 and 1970, the land area affected by aviation-related noise and the complaints they received with noise as the culprit increased sevenfold.

Thomas Paine :: essays research papers

Library Historical Documents Thomas Paine Rights Of Man Part The First--------------------------------------------------------------------------------Order The Rights of Man now.Part The FirstBeing An Answer To Mr. Burkes Attack On The French rotary motion--------------------------------------------------------------------------------George WashingtonPRESIDENT OF THE UNITED STATES OF AMERICASIR,I present you a small treatise in defence of those principles of freedom which your exemplary legality hath so eminently contributed to establish. That the Rights of Man may become as universal as your benevolence can wish, and that you may enjoy the happiness of seeing the cutting World regenerate the Old, is the prayer ofSIR,Your much obliged, andObedient humble Servant,THOMAS PAINE--------------------------------------------------------------------------------The Authors Preface to the English EditionFrom the part Mr. Burke took in the American Revolution, it was rude(a) that I should consider him a friend to mankind and as our acquaintance commenced on that ground, it would have been more agreeable to me to have had cause to continue in that opinion than to change it.At the time Mr. Burke made his violent speech last winter in the English Parliament against the French Revolution and the National Assembly, I was in Paris, and had written to him but a short time before to inform him how prosperously matters were going on. Soon after this I saw his advertisement of the Pamphlet he intended to publish As the attack was to be made in a language but petty studied, and less understood in France, and as everything suffers by translation, I promised some of the friends of the Revolution in that country that whenever Mr. Burkes Pamphlet came forth, I would answer it. This appeared to me the more incumbent to be done, when I saw the flagrant misrepresentations which Mr. Burkes Pamphlet contains and that while it is an come onrageous abuse on the French Revolution, and t he principles of Liberty, it is an imposition on the rest of the world.I am the more astonished and disappointed at this conduct in Mr. Burke, as (from the circumstances I am going to mention) I had formed other expectations.I had seen enough of the miseries of war, to wish it might never more have existence in the world, and that some other mode might be found out to settle the differences that should occasionally arise in the neighbourhood of nations. This certainly might be done if Courts were disposed to set honesty about it, or if countries were teach enough not to be made the dupes of Courts.

History of Swimming :: essays research papers fc

HISTORY OF SWIMMINGSwimming was invented before recorded history. Humans discovered how toswim by accident. A person probably fell into the water and struggled to shore using adog-paddle stroke. There was an Egyptian hieroglyph for swimming dating from 2500BC. The ancient Greeks and Romans do swimming an important part of their militarytraining programs. There have been known swimming contests that were organized inJapan as early as the 1st century BC.During the Middle Ages in Europe, swimming declined in popularity. People feltthat the water was contaminated and a source of disease. Not everyone feared the water,however, Louis XI reportedly swam daily in the Seine.During the early 19th century, swimming enjoyed a revival, especially in England,Lord Byron swam the Dardanelles river, to prove that the mythological hero Leandercould have done it. organized competitive swimming began in England in the 1840s.In 1844 the British were surprised when two American Indians demonstrated the efficiency of a method of swimming equivalent to the modern crawl. The British still swamwith the head above the water, a holdover from the days when people believed that thewater was contaminated. An overhand stroke was introduced into England in 1873 by J. Arthur Trudgen,who had seen second American Indians using this method to swim really fast. When theflutter kick was introduced, the modern "Australian crawl was born, and this stroke hassince become the closely common and most important swimming stroke.FITNESS COMPONENTSTo swim well u need to know how to coordinate your arms and legs to get youthrough the water. At first you pass on probably need to have lessons. Also to swim u needagility and just gravity. Swimming also requires balance and quickness in rough cases.Not much is needed to know if you want to swim.Swimming improves heart and lung efficiency, enhances muscle strength andendurance, improves flexibility, and reduces stress. Its easy on the joints, and uses t o a greater extentmuscles than most new(prenominal) forms of exercise. Although swimming burns a great deal ofcalories, recreational swimmers tend to lose less weight than would be expected fromother types of aerobic activity. Scientists ordain that cold water removes heat from the body,stimulating appetite to keep the body warm. Exposure to cold water may encourage thebody to maintain fill out stores for insulation. To lose weight by swimming, its necessary tocut down on the calories you eat, and to swim fast enough and long enough. Swimming can burn more than 660 calories an hour when performed correctly and causes less injuries to joints and muscles than aerobics or jogging.

Insurance Mandate Essay -- Healthcare

1. (a) Why was the requirement of an insurance mandate for all citizens so important that it was back up by the Heritage Foundation a right wing conservative think tank, cause Speaker of the House and presidential candidate Newt Gingrich, former Senate Majority Leader and presidential candidate Bob Dole and former Governor and presidential candidate Mitt Romney who made it a provision of the mom health care law? The requirement of an insurance mandate for all citizens was so important to conservatives because it called for individual obligation to address what economists call the free-rider effect (http//www.npr.org/templates/ theme/story.php?storyId=123670612). This keeps individuals who become injured from being able to get a free ride off the backs of other citizens who have insurance. The mandate would require individuals to take responsibility for their own health care needs. Having a mandate would also prevent premiums from escalating because an affordable policy would be e asy to come by. The mandate likewise gives urge for employers to offer health care benefits to their employees.Furthermore, todays individual mandate wont allow high-deductible, lower cost plans that pay only for ruinous illness. And some low-wage workers who get mini-med coverage through employers will likely have to buy more comprehensive policies (http//www.politifact.com/georgia/article/2012/mar/26/health-care-debate-switching-sides-individual-mand/). No one would be able to purchase just a new bare necessities policy, and employers would most likely beef up their benefits packages to employees. Denying people coverage with exist conditions will also not be allowed. This precedence would back up the co... ...rk Longman, 2011. 348. Print.Young, Jeffrey. Supreme Court Health Care Reform Without Mandate, Nightmare Awaits Insurers, Uninsured. The Huffington Post. TheHuffingtonPost.com, 28 Mar. 2012. Web. 13 Apr. 2012. http//www.huffingtonpost.com/2012/03/28/supreme-court-health- care_n_1385710.html.Works CitedThe Economist. The Economist Newspaper. Web. 13 Apr. 2012. http//www.economist.com/economics-a-to-z/d.Federal Open Market Committee. FRB. FRB. Web. 13 Apr. 2012. http//www.federalreserve.gov/monetarypolicy/fomc.htm.Strategic Defense Initiative (SDI) (United States Defense System). Encyclopedia Britannica Online. Encyclopedia Britannica. Web. 13 Apr. 2012. http//www.britannica.com/EBchecked/topic/568214/Strategic-Defense-Initiative-SDI/.Volkomer, Walter E. Chapter 13. American Government. New York Longman, 2011. 352-353. Print.

Appearance Vs. Reality Essay -- essays research papers

In Hamlet, one of Shakespeares greatest plays, the young prince of Denmark must uncover the truth about his fathers death. Hamlet shows a play that tells the stratum of a young prince whose father recently died. Hamlets uncle Claudius marries his mother the queen and takes the throne. As the play is told Hamlet finds out his father was murdered by the recently laureled king. The musical composition that remains constant throughout the play is expression versus worldly concern. Things within the play appear to be true and honestbut in reality are infested with evil. Many of the characters within the play mist slow a mask of falseness. Four of the main characters that hid behind this mask are Polonius, Rosencrantz, Guildenstern, and King Claudius. From behind this mask they give the impression of a person who is sincere and genuine, in reality they are plagued with lies and evil. Their manner makes it very difficult for Hamlet to uncover the truth, because the characters hide b ehind their lies. Polonius, the kings royal assistant, has a preoccupation with appearance. He always wants to keep up the appearance of a loving and caring person. Polonius appears resembling a man who loves and cares about his son, Laertes. Polonius speaks to his son with advice that sounds sincere but in reality it is rehearsed, hollow and without feeling. Poloniusgives his advice only to appear to be the loving, caring father. The reality is he only speaks to appear sincere as a politician, to look in front of the king true rather then actually be good "And borrowing dulls the edge of husbandry. This above all to thine own self be true, And it must follow, as the night the day, Thou commodest not then be false to any man. Farewell my blessingseason this in thee" Act 1 Polonius gives his son Laertes his blessing to go away, and then he sends a sleuth to follow him and keep an eye on him. This shows his lack of trust for anyone. He gives the appearance of a confident f ather who trusts his son to go off on his own, when in reality he lies about his trust for his son. This is made obviuos by the fact that he sends a spy towatch him. Polonius further adds to the theme of appearance verses reality by ordering Ophelia to stop seeing Hamlet. He lies to her telling her that Hamlet does not love her, he only lusts for her, in truth he has no idea whether or not Hamlet loves her. He says to her Ay,... ...is ,making Claudius a more deserving person to be king. As Claudius speaks in council he gives the appearance of someone who is a deserving person that should be king. Claudius is voted in as king meaning he is already approved by everyone. Claudius gives respect to his subjects prominent the council the impression that he respects them. The king shows general concern for Hamlet, his nephew. These things make it very difficult to prove the truth about Claudius in the future for he has not only won the love and respect of council, But also possibly preve nted a attack on Denmark (from Fortinbras) proving that he is good king that can protect the state from harm. Claudius makes it very difficult for Hamlet to prove the truth about the true nature of Claudius. Throughout the play, the characters all help to show the theme of appearance verses reality. Polonius, Rosencrantz (Guildenstern) and the king all appear to be good and honest. As Hamlet finds out, all contain lies and have mystical intentions within them. As apiece character is presented in the play all appear to be good and honest making it a difficult task for Hamlet to uncover the hidden truth about the nature of each character.