Consider whether the Consumer Protection Act Essay Example

Learning objectives Assignment Example | Topics and Well Written Essays - 1000 words

Learning destinations - Assignment Example The aptitudes got the hang of during the primary target achievement were perception abilities, learning the predominant hypotheses in HR field, refreshing my insight base for working in HR division and critical thinking aptitudes. In HR, it is imperative to have great perception aptitudes so that the employees’ exhibitions can be observed and so as to inspire them, it is critical to have forward-thinking data about market patterns with respect to employees’ pay and should be proactive in taking care of the HR issues. I prescribed the HR head to build up a strategy in which the HR issues are understood by a different council so time of different workers in HR division is spared. There were twenty workers in the HR office and when some issue was raised, ten representatives were relegated the undertaking of settling it. Thus, my proposal was mulled over and five representatives were given the obligation of settling any HR related issue. At first, I confronted a few issues as my composing abilities were not solid but rather in the long run I figured out how to impart the message effectively and unmistakably. I was mostly ready to finish my learning objective toward the finish of my temporary position program. When working in HR office, it is significant that one has great relational abilities as it causes worker to speak with one another adequately and comprehend different representatives with whom you are filling in as a group (Torrance, 282). During my temporary position, I needed to associate with numerous workers and my boss used to give me the obligation of conveying HR approaches to representatives in different divisions through messages on Intranet. While satisfying this target, I figured out how to viably utilize the specialized apparatuses, for example, messages to advise different representatives in the organization about changing strategies or acquainting them with new guidelines and guidelines. Now and again, I needed to confront analysis as I was feeble in imparting the message effectively however in the long run I

Essay Sample Corruption

Essay Sample Corruption Corruption Mar 26, 2018 in Law Corruption Issues Over the last couple of years, headlines in the media, those in newspapers, social sites, magazines and journals have been shedding light on the corruption issues, associated with prosecutors, judges, and the police force. This trend serves to illustrate the magnitude of the problem within law enforcement officials and the entire criminal justice system (Bassett and Prenzler, 2002). It all begins from the lowest levels (roots), spreading to other vital parts where the growth and development occur. In an effort to achieve ethics in the society, more so in the criminal justice system, the study subject must be well understood. Criminal justice, law, ethics and police investigations are closely related. The prevalence of corruption within the Police force, correctional facilities and the entire law enforcement department are the much debated issues and the one that is frequently rife with the numerous problems.

Supply and Demand Essay - 1417 Words

Team C Aggregate Demand and Supply Models OPTION 2: ECONOMIC CRITIQUE ECO/372 October 1, 2012 Option 2: Economic Critique The aggregate demand and supply model (AS-AD Model) is an economic model that has the capabilities to account for business cycles of expansion and recession, and helps to model macroeconomic policy. Aggregate demand is the total demand of goods and services for a specific period of time. Aggregate supply is the total supply of goods and services at an overall period of time (Colander, 2010). The aggregate demand and supply model seeks equilibrium. For example, when the aggregate demand is higher, it will move the economy to equilibrium with higher levels of output and price†¦show more content†¦This model shows that inflation rises when unemployment falls. Expectations An expectation is something that people think will happen. Expectations, especially when an economy is experiencing hard times, influence economic decisions because there is no crystal ball to predict or guarantee the future trends of the economy. Individuals often alter their expectations pertaini ng to the future of an economy based on the current economic condition and data available. Key economic variables such as price, income, taxes, and sales are affected by the expectations of decision makers in an economy and have the potential to change the way the economy operates. Expectations affect demand and heightened uncertainty reduces economic activity and holds down inflation. Economic expectations a person has are normally based extrapolative historically, rationally. An extrapolative expectation is based on the idea that a trend will continue. Historically based expectations are based on past events about the future and rational expectations are forward-looking expectations that use available information. Consumer attitudes and expectations are important to economic recovery because consumer spending drives 70% of economic growth (The Conference Board, 2012). For a lagging economy to grow consumer confidence must increase. The Consumer Confidence IndexShow Mo reRelatedSupply And Demand Of Demand1442 Words   |  6 Pages Supply and Demand Kimberly Jo DeVoy Western Governor’s University â€Æ' Supply and Demand A. Elasticity of demand represented as â€Å"Ed† is defined as a â€Å"measure of the response of a consumer to a change in price on the quantity demanded of a good† (McConnell, 2012). Determinants for elasticity of demand would include the substitutability of a good, proportion of a consumer s income spent on a good, the nature of the necessity of a good and the time a purchase is under consideration by theRead MoreDemand And Supply And Demand Essay1074 Words   |  5 PagesNTCC PROJECT DEMAND AND SUPPLY BY: ­ SHUBHAM PACHORY B.COM HONS.(EVENING) ROLL NO  ­44 ABSTRACT There is no law of â€Å"supply and demand†. there are two separate laws of demand and law of supply. A demand curve is a graphical depiction of the law of demand. It has negative slope. Substitutes are goods that can be consumed in place of each other. Complementary are goods that consumes together. Demand and supply affected by price of the commodity, income of the consumer, change in technologyRead MoreDemand, Supply, Elasticity Of Demand And Supply1069 Words   |  5 PagesIntroduction: This topic is related to demand and supply, elasticity of demand and supply as well as market structure. Housing sector is a good example of monopoly market. This report is an attempt to represent the current real-estate scenario as well as the factors affecting this scenario with the help of some of the relevant and related economics theories. Housing affordability has become a very important issue of discussion among real estate agents, normal people, media and politicians in today’sRead MoreSupply and Demand969 Words   |  4 PagesSupply and Demand XECO 212 April 10, 2011 Supply and Demand In economics supply and demand refers to the relationship between the accessibility of a good or service and the need or wish for it amid buyers (Microsoft, 2009). Our daily lives are affected by supply and demand. Demand is based on the price of a product, the price of related products, and customer’s salary and preference. Supply can rest not only on the price available for the product but also on the cost of similar productsRead MoreDemand and Supply964 Words   |  4 Pagesï » ¿ 3. Demand and Price Elasticity It is important to understand how price changes affect the demand of fast food especially for firm like McDonald that operates in a Monopolistic Market. When McDonalds offers its discounted Value Meal during lunch and dinner hours, the demand for McDonald’s products will increase. According to the law of demand, other things equal, the quantity demanded of a goods increases when the price of the good falls. (N.Geogory Mankiw et al.,2013). A change in price willRead MoreSupply And Demand Of Supply2079 Words   |  9 PagesSupply and demand is perhaps one of the most fundamental concepts of economics and it is the backbone of a market economy. Demand refers to how much (quantity) of a product or service is desired by buyers. The quantity demanded is the amount of a product people are willing to buy at a certain price; the relationship between price and quantity demanded is known as the demand relationship. Supply represents how much the market can offer. The quantity supplied r efers to the amount of a certain goodRead MoreDemand and Supply963 Words   |  4 PagesDemand and supply The term demand refers to the quantity of a given product that consumers will be willing and able to buy at a given price. As a general common sense rule - the higher the price of a particular product the lower will be the demand for it . The term supply refers to the quantity of a particular product that suppliers (producers and/or sellers) will make available to the market at a particular price. The higher the price, the greater the quantity that suppliers will be willingRead MoreSupply and Demand1131 Words   |  5 Pagesthe basic laws of supply and demand that govern our society today. The prestigious economist Adam Smith once proposed that society was governed by an â€Å"invisible hand† which worked to self-regulate the marketplace in the midst of the ambitious goals of sellers and consumers alike. It is by this â€Å"invisible hand† that our economy today works, and it can be used to make sense of how the laws of supply and demand work together to guide markets such as that of ice cream. The law of supply states that a riseRead MoreSupply and Demand1107 Words   |  5 Pagesï » ¿Supply and Demand Factors Understanding supply and demand is the underlying foundation of all economics. The term demand is used to indicate consumers’ willingness to buy while supply indicates willingness to sell. The relationship between demand and price is reflected by quantity demanded, meaning that at a certain price with everything else held constant, this is the amount people are willing to buy. The same applies for supply for quantity supplied, at a given price with all else constant thisRead MoreSupply and Demand1181 Words   |  5 PagesNone of the above. Answer: C 4) Suppose the demand for Digital Video Recorders (DVRs) is given by Q=250 - .25p + 4pc, where Q is the quantity of DVRs demanded (in 1000s), p is the price of a DVR, and pc is the price of cable television. How much does demand for DVRs change if the p rises by $40? A) drops by 10,000 DVRs B) increases by 16,000 DVRs C) drops by 2,500 DVRs D) increases by 4,000 DVRs Answer: A 5) Consider the demand function Qd = 150 - 2P. The effects of other determinants

The Secret Of Happiness By David Myers - 1374 Words

Heidi Alfaro English Composition 1101-61 Professor Kate 8 October 2015 Personal Happiness A powerful quote said by pre-socratic philosopher named Democritus says â€Å"Happiness resides not in possessions, and not in gold, happiness dwells in the soul†. In other words, happiness does not come from materialism but instead from the things money can’t buy. In the article The Secret of Happiness the author David Myers writes directly to Americans about how he believes we need to obtain a new â€Å"American Dream† that emphasizes personal happiness instead of materialistic happiness. Myers also believes happiness resides in the soul and he says people that think money is the key to happiness are actually less content with themselves and he uses various ways to prove this point. With that being said materialistic happiness vs personal happiness is an important issue, and Myers made a strong use of Logos by showing surveys and studies, Ethos by showing credibility in his argument but he could have used more Pathos by using m ore emotion and enthusiasm in his argument. To begin with, in the The Secret of Happiness Myers begins by talking about the original â€Å"American Dream† which is materialism. After that he says that Americans are getting too caught up on materialistic happiness and not focusing enough on achieving personal happiness. Myers also writes what he believes are the four most important things that lead to a happier lifestyle. Those aspects according to Myer’s are, closeShow MoreRelatedWhy Money Can Buy Someone Happiness?1497 Words   |  6 Pagesin the audience can keep it. In the end, everything went exactly according to plan, the Horsemen stole the money, the audience kept the money and everyone was happy. So, it is safe to conclude that money can buy someone happiness? According to professor of psychology David G. Myers, it can’t. In his article â€Å"The Funds, Friends, and Faith of Happy People†, published in Money Changes Everything by Lawrence Weinstein, which he used to address his fellow psychologists, the affluent and the middle-classRead MoreEssay about Shout it out: Study of Introverts1379 Words   |  6 Pagesjob. Another point they address is introverts tend to be less intimidating and easier to use as a sounding board for new ideas. Finally, introverts are less likely to filibuster and not let other employes talk. 3.Grant, Adam ,Francesca Gino,and David A. Hofmann.  Ã¢â‚¬ The Hidden Advantages of Quiet Bosses† Harvard Business Review. Harvard Business Publishing,2010. Web. 18 Dec 2013, for this article Harvard Business Review takes a look at the long held assumption that extraverts always make betterRead More Escape from Industrialization in Wells The Time Machine Essay3499 Words   |  14 Pagesno danger of war or solitary violence, no danger from wild beasts, no wasting disease to require strength of constitution, no need of toil (28).   Wells saw in the Victorian era the attitude that technology equals progress and progress equals happiness.   But while the society of the Eloi had seemingly successfully escaped from its hardships and suffering, the resulting world was not necessarily better.   Progress in science, industry, and technology did not necessarily produce good in this caseRead MorePyschoanalytic Personalities Essay Notes9106 Words   |  37 Pagescase of David, who has never done very well in school. He’s not a terrible student, but beside the honor-roll records and academic accomplishments of his two siblings, his record looks paltry. Over time, he has developed an inferiority complex—an uncomfortable sense of being dull, even inferior to his brother and sister. An individual struggling to overcome such a complex might fabricate a superiority complex as a way of maintaining a sense of self-worth, and in fact this is what David has doneRead MoreSummary of She Dwelt Among the Untrodden Ways11655 Words   |  47 Pagesand relevance of Lucys identity, the 19th-century poet, essayist and literary critic Frederic Myers (1843–1901) observed that: here it was that the memory of some emotion prompted the lines on Lucy. Of the history of that emotion, he has told us nothing; I forbear, therefore, to inquire concerning it, or even to speculate. That it was to the poets honour, I do not doubt; but who ever learned such secrets rightly? or who should wish to learn? It is best to leave the sanctuary of all hearts inviolateRead MorePortfolio for Organizational Behavior17518 Words   |  71 Pageson something, it might as well be with people you like.† In the end, â€Å"it is going to be the companies that make their employees happiest that will attract the best people,† says Mr Hsieh, picking up a theme from his best-selling book, â€Å"Delivering Happiness†. This philosophy is taking hold in many of the world’s leading firms as they engage in an increasingly fierce war for talent. This is being fought on at least three fronts, each of which requires a somewhat different strategy. The first involvesRead MoreAmerican Civil Rights Movement Essay15820 Words   |  64 Pagesborn to unmarried mothers. 1980 Leading cause of death among young black men is murder. Blacks account for half of the male prison population, while they are only 6% of all Americans. 2. David Griffith and the Stars of the Silent Films Era One of the most popular producers of silent cinema was David York Griffith. shot 61 short films. most promising american producers. =Shakespeare of Screen. a genius producer, a founder of new cinema language. innovator in the sphere of actor art. GRead MoreStephen P. Robbins Timothy A. Judge (2011) Organizational Behaviour 15th Edition New Jersey: Prentice Hall393164 Words   |  1573 PagesBlowing Your Top Is a Good Thing 122 Questions for Review 121 Experiential Exercise Who Can Catch a Liar? 123 Ethical Dilemma Happiness Coaches for Employees 123 Case Incident 1 Is It Okay to Cry at Work? 124 Case Incident 2 Can You Read Emotions from Faces? 124 S A L S A L 5 Personality and Values 131 Personality 133 What Is Personality? 133 †¢ The Myers-Briggs Type Indicator 135 †¢ The Big Five Personality Model 136 †¢ Other Personality Traits Relevant to OB 139 x CONTENTS Read MoreOne Significant Change That Has Occurred in the World Between 1900 and 2005. Explain the Impact This Change Has Made on Our Lives and Why It Is an Important Change.163893 Words   |  656 PagesCommunity in Autotown, U.S.A. Van Gosse and Richard Moser, eds., The World the Sixties Made: Politics and Culture in Recent America Joanne Meyerowitz, ed., History and September 11th John McMillian and Paul Buhle, eds., The New Left Revisited David M. Scobey, Empire City: The Making and Meaning of the New York City Landscape Gerda Lerner, Fireweed: A Political Autobiography Allida M. Black, ed., Modern American Queer History Eric Sandweiss, St. Louis: The Evolution of an American Urban Landscape Read MoreFundamentals of Hrm263904 Words   |  1056 Pages24/7 FAQs, online chat, and phone support www.wileyplus.com/support Your WileyPLUS Account Manager Training and implementation support www.wileyplus.com/accountmanager MAKE IT YOURS! Fundamentals of Human Resource Management Tenth Edition David A. DeCenzo Coastal Carolina University Conway, SC Stephen P. Robbins San Diego State University San Diego, CA Tenth Edition Contributor Susan L. Verhulst Des Moines Area Community College Ankeny, IA John Wiley Sons, Inc. Associate

Acid Rain Free Essays

Acid rain is a rain or any other form of precipitation that is unusually acidic, i. e. elevated levels of hydrogen ions (low pH). We will write a custom essay sample on Acid Rain or any similar topic only for you Order Now It can have harmful effects on plants, aquatic animals, and infrastructure through the process of wet deposition. Acid rain is caused by emissions of sulfur dioxide and nitrogen oxides which react with the water molecules in the atmosphere to produce acids. Governments have made efforts since the 1970s to reduce the release of sulfur dioxide into the atmosphere with positive results. Nitrogen oxides can also be produced naturally by lightning strikes and sulfur dioxide is produced by volcanic eruptions. The corrosive effect of polluted, acidic city air on limestone and marble was noted in the 17th century by John Evelyn, who remarked upon the poor condition of the Arundel marbles. Since the Industrial Revolution, emissions of sulfur dioxide and nitrogen oxides to the atmosphere have increased. In 1852, Robert Angus Smith was the first to show the relationship between acid rain and atmospheric pollution in Manchester, England. Though acidic rain was discovered in 1852, it was not until the late 1960s that scientists began widely observing and studying the phenomenon. [6] The term â€Å"acid rain† was coined in 1872 by Robert Angus Smith. 7] Canadian Harold Harvey was among the first to research a â€Å"dead† lake. Public awareness of acid rain in the U. S increased in the 1970s after The New York Times promulgated reports from the Hubbard Brook Experimental Forest in New Hampshire of the myriad deleterious environmental effects demonstrated to result from it. Occasional pH readings in rain and fog water of well below 2. 4 have been reported in industrialized areas. Industrial acid rain is a substantial problem in China and Russia and areas down-wind from them. These areas all burn sulfur-containing coal to generate heat and electricity. The problem of acid rain not only has increased with population and industrial growth, but has become more widespread. The use of tall smokestacks to reduce local pollution has contributed to the spread of acid rain by releasing gases into regional atmospheric circulation. [13][14] Often deposition occurs a considerable distance downwind of the emissions, with mountainous regions tending to receive the greatest deposition (simply because of their higher rainfall). An example of this effect is the low pH of rain (compared to the local emissions) which falls in Scandinavia. How to cite Acid Rain, Essay examples Acid rain Free Essays string(33) " highly toxic to many organisms\." The French chemist Ducros first used the term ‘pluie acide’ in 1845. The phraqse ‘acid rain’ ,was brought in 1872 by Robert Angus Smith (Wellburn, 1994). Back in fifties, there were observations of lakes in Scandinavia losing their fish populations. We will write a custom essay sample on Acid rain or any similar topic only for you Order Now Anglers and naturalists noticed that fish stocks in many lakes of southern Scandinavia were diminishing. Freshwater acidification had rapidly worsened over a few decades. Although acid rain and the acidification are a not new problem that has received considerable attention for many years, it was not until 1960s that scientists were able to link these effects to any specific cause. Later it was found to be atmospheric pollution. Acidification is not a regional phenomenon. In Scotland, studies show that the acidification began around the middle of the last centuries and the process has accelerated in the last three decades. In southern Norway, It has reported that 87 lakes had a pH below 5.5 (Mason, 1996). Damaged forests were becoming widespread in West Germany. As these examples show, acidification is an international problem. Pollutants may be carried with winds over distances, from points hundreds or thousands of miles away. Some countries are net importers of pollution, and others are exporters. The effects of acidification are varies, not only pollution of lakes and forests as previously mentioned, but also effects on fauna and flora, soil, groundwater and direct or indirect harm on human health, and all things are influenced by water quality through hydrological pathway (Thunberg, 1993). The aim of this report is to discuss causes and effects of acidification that has been concerned until now, and present possible short-term and long-term soluti on to acid deposition effects on water quality 1. Acidification and its causes Airborne pollution can influence the environment both directly and indirectly. Primary pollutant is Sulphur dioxide and nitrogen oxides. When these are present in high concentrations, they can cause damage on environment and human’s health. These direct effects are often peak in the vicinity of the emission sources. Industrial society discharges suphur dioxide and nitrogen that form sulphuric acid and nitric acid, which may be carried with the winds over long distances before descending in rain or snow. Indirect effects often occur as acidified soil and water far away from the sources of emission (Thunberg, 1993). There are gas-phase reactions, which produce acidity in the atomosphere. Sulphur dioxide and nitrogen oxides form suophuric and nitric acids on coming into contact with water. When these acids reach the ground in rain and snow, it is called ‘wet deposition’. However, acid oxides may also be deposited directy as gases, or cles, which is called ‘dry deposition’. The rates of dry deposition velocity may depend on the nature of the land surfaces. Rates of wet deposition depend on the precipitation rate, the washout ratio of dissolved pollutant per unit mass of cloud water or rain divided by the concentration of the same pollutant per unit mass of air (Wellburn, 1994. A low pH value means a high level of acidification. Water in neutral condition has a pH of 7 (Thunberg, 1993). Sulphur and Nitrogen Cycles are presented below (Figure 1 and 2). Figure 1. Sulphur Cycle Source: ICU (2003) Figure 2. Nitrogen Cycle Source: ICU (2003) 1.1 Sulphur Sulphur compounds are responsible for about two-thirds of the acidification of rain. Sulphur in gaseous form, sulphur dioxide (SO2), is mainly formed in the combustion of oil and coal. The rapid increase in emission of pollutants came after the war followed by consumption of fuel and oil. It was reported that approximately 20 million tons of sulphur are now emitted every year in Europe. There is also a great deal of airborne pollution in North America, where about 12 million tons of sulphur is released every year. Sulphur can be formed by naturally by eruption of vulcanoes, from seas and oceans and certain processes in the soil. However, 90 per cent of the emissions of sulphur to the atmosphere are derived from industrialised parts of Europe and North America. This is ten times the level that can be considered natural (Thunberg, 1993). 1.2 Nitrogen Nitrogen oxides (NOX) are grouped term of nitrogen monoxide (NO) and nitrogen dioxide (NO2). Nitrogen oxides are formed in all types of combustion, most of the NOX are formed by the reaction of nitrogen gas in the combustion air with oxygen. When the mixture of nitrogen gas and oxygen is heated, they interrelate to form NOX. The higher the combustion temperature, the more NOX will be formed. The largest source of NOX emission is road traffic. These emissions are reported to have doubled during the 1960s, approximately 22 million tons of NO2 are released every year in Europe. Certain types of fertilizer are another source of nitrogen pollution. Nitrate leaching intensified the acidification of the soil, which release unwanted substances such as aluminium (Thunberg, 1993). 2. The environmental effects of acidification 2.1 water acidification and aquatic biota Acidification was first noticed in the lakes. The initial victims of acidification are nutrient-deficient lakes in areas where the soil has a poor buffering ability (Thunberg, 1993). It is reported that many lakes in the Rocky Mountain have little alkalinity to buffer increase in acid deposition, however loss of alkalinity has been observed caused by high concentration of acid deposition due to the emission in the Rocky Mountain region (Turk et al, 1989). Figure 3. Acidified lake: A deep blue colour of a lake is a sign of acidification. Source: ARIC (2000) In severely acidified lake, the fish will have vanished entirely, bog moss will have spread out over the lake floor, and only few plant and animal species will remain. The first victims of acidification are crayfish, snails and mussels, certain types of zoo- and phytoplankton, and some species of mayfly. Usually, certain types of bog moss and insects those are resistant to acidification remains. This is not only low pH value that takes a heavy toll of fauna and flora. In acid lakes there are increased concentrations of aluminium in ion form, which is highly toxic to many organisms. You read "Acid rain" in category "Papers" The loss of fauna / flora is due to the combination of a lowered pH and aluminium poisoning. The level of other heavy metals also rises such as cadmium, zinc, and lead. Those heavy metals including aluminium flow into lakes from the acidified soils of the surroundings. The relationship of prey and predators will also change, for instance certain insects on which they usually prey begin to thrive when their predators are disappeared (Thunberg, 1993). 2.2 Soil/water interactions Acidification process takes place naturally in the soil. The plant releases hydrogen ions as it uptake nutrients. Though the growth itself is acidifying, there is no net acidification where growth and decay are about equal. However, the cycle is broken by harvesting, the acidifying process will take over. Soil acidification may have biological effects in the respects through lowering of the pH value, an increase in the levels of aluminium and other toxic compounds and a loss of plant nutrients due to increased leaching, consequently may lower drainage water pH (Thunberg, 1993). Moreover, Long-term increase in nitrogen supply may be responsible for alterations in root and shoot growth of plants(Carrol et al, 2003). Figure 5. Soil pH range source ANRA (2003) 2.3 Effects of forestry practices Forestry practices can cause the soil and water to become acidified in several ways. Forest growth change drainage water pathways to stream, and increase stream water acidity. Extensive clear cutting can also accelerate the acidification of surface water. Applying acidifying fertilizer also helps to acidify soil and water (Thunberg, 1993). Twelve years studies of acidification-induced chemical changes in soils of Norway spruce and Scot pine in southern Sweden reveals that pH in mineral soil decreased on average 0.17 units between 1988 and 1999. It is said that these changes in forest soil are mainly due to the extensive deposition of acidifying substances (sulphur and nitrogen compounds) during the latter part of the 20th century (Jà ¯Ã‚ ¿Ã‚ ½nsson et al, 2003). In addition, atmospheric pollution directly damages forest itself. Since the early 1970s, West Germany has experienced a rapid and widespread decline in the health of its forest trees; especially sensitive species were affec ted by exposure to low levels of pollutants (Ling et al, 1987). 2.5 Groundwater quality Most of the precipitation sinks to some extent into the ground. The more permeable the soil, the more water dribbles down. Normally acid rain will become less acid as it penetrates through the ground. However, where the soil becomes acidified and has less ability to neutralize, the effect will be decrease until it finally ceases. It is unlikely that acid groundwater will be harmful to human health, however toxic heavy metals, such as aluminium and cadmium may appear at elevated level where highly acidic. These metals are harmful for human health (Thunberg, 1993). 3. Solutions Solutions to the problems of acidification fall into two groups, which are cure and prevention. Remedial measures can be applied where the problems actually arise (i.e. soils and surface waters). Preventive measures can be applied at source (i.e. at point of emission of the sulphur and nitrogen oxides). The latter are expensive and the least acceptable to industry, however they are in fact more effective, more sustainable, and more immediately required (Park, 1987). Causal treatment by reducing aciditying emissions is the primary goal in a long-term as preventive measures, however outcomes from this approach are still uncertain and recovery may be slow. Indicative treatment, involving the addition of neutralizing agent such as powdered limestone to affected environment is the only realistic remedy in the short-term, and has become a widespread practice in Europe (Thunberg, 1993). 3.1 Short-term solutions Remedial action should be taken after the problems happen. This requires not simply the elimination of symptoms of damage (i.e. restocking fish in acidified lakes, planting new trees); it also involves restoration of natural chemical balances to ensure that damage does not reappear. Some materials in nature have ability to buffer, or neutralize, or offset acid input. Lime and limestone are the most accepted of a range of chemicals that can be used to buffer acidic materials. Lime has been added normally by spraying from helicopter to catchments, soils and forests to alleviate damage and improve conditions for environment (Park, 1987). With regard to the lakes and streams, this raises pH value of the water and decrease in the levels of heavy metals. After the liming many species quickly return to their former habitat (Thunberg, 1993). This approach has been most widely investigated in Sweden (Park, 1987). This measure had been made in UK as well. Stream chemistry and biological effect was monitored for 10 years after the catchments of three acidified Welsh streams at Llyn Brianne were limed in 1987/88. This monitoring reveals that chemistry in treated streams changed significantly as mean annual pH increased from 5-5.1 before liming to 6.1-6.2; mean annual aluminium concentrations decreased from 0.15-0.18 to 0.05-0.11 mg L-1, and calcium concentrations increased from 0.8-2.0 to 2.4-4.5 mg L-1. The abundance of Acid-sensive taxa in limed streams increased after treatment. Liming has also been used as a means of restoring acidified soils. This improves the productivity of croplands and forests. However, liming can cause negative impacts on stream, such as fine CaCO3 deposited on the stream banthos. In addition, liming is an expensive ‘cure’ measure. Sweden spent approximately $10 million from 1980-1983 for liming. Moreover, it is not practical for many lakes and rives, for some streams it is no help at all. There is uncertainty in relation to the effect of liming in a long run. Many studies have undertaken for the effects of post liming over short timescales, yet little has known about the long-term effects. At least 10 years monitoring is recommended (Bradley et al, 2002). Liming is a interim measures that provide biological defence, however it does not attack the root caused of the problems. It has been said that ‘a sort of artificial respiration for dead lakes and streams’. Therefore, real effective measures are long-term prevention deliberate through a sustained policy, rather than cure. 3.2 Long-term solutions The only way to solve the problem of acidification in the long run is to reduce emissions of pollutants. The central point of the political debate over acid rain is the need to reduce rainfall acidity by controlling emission of SO2 and NOX at source, mainly from power stations and vehicles: Reducing emissions of SO2 from power stations by: Burn less fossil fuel Switch to low-sulphur fuel Fuel desulphurisation Sulphur reduction at combustion Flue gas desulphurisation Disperse flue gases Reducing emission of NOx from power stations by: Reduce NOx emissions during burning Reduce NOx levels after burning Reducing emissions of NOx from vehicles by: Modify engines or exhausts to reduce emissions Change to different type of engine Transport planning It is said that technology of controlling and reducing such emissions already exist. Some methods should be applied separately or in combination to be able to bring reduction to agreed levels within agreed time-scales. However, this problem is not only to do with a technical one. Political goodwill is essential as this measures involves high cost. All the cost should be offset by positive side-effects such as the creation of new jobs and generation of useful by-products (i.e. commercial sulphuric acid), the values of conserving fish, forest and crops, and benefits in improved human health (Park, 1987). In recent decades, there have been national and international efforts to achieve reduction in emissions of sulphur and nitrogen compounds to the atmosphere (Ferrier et at, 2001). As previously mentioned, emissions of sulphur and Nitrogen are carried by air and deposited as gases and aerosols and dissolved in rainwater, in areas far from their sources. The quality of air is very much influenced by emissions in others, so it will benefit little for any country alone to reduce emissions. This is called transboundary Import-Export Budgets. Data for 1998 is presented in Appendix A Without international cooperation, there can be no real solution (Thunberg, 1993). The details of these treaties and protocols are presented in Appendix C 4. Improvement Recent data shows that both emissions seem steadily declined particularly after these treaties and protocols noted above have adopted (See appendix B). However, compared to reduction of SO2 emission, NOX emission need to be reduced further, especially U.S, whose emission has not been much reduced. Conclusion Acidification has a long history as posing adverse impacts on various ecosystems and human health. The main sources of pollution are SO2 and NOX. These pollutants are naturally exist, however recent increases of these pollutants are caused by human-induced factors, such as power generation and transportation. Remedial measures have been taken to abate damaged environment by acid deposition. Preventive measures have been adopted for preventing further damages. In attempts to make steadily progress for both redemption and prevention for solution of acidification for water quality, use of combination of short-term and long-term solution will be recommended. How to cite Acid rain, Papers Acid Rain Free Essays Rain is very important for life. All living things need water to live, even people. Rain brings us the water we need. We will write a custom essay sample on Acid Rain or any similar topic only for you Order Now But in many places in the world even where you live, rain has become a menace. Because of pollution in the air, acid gases from factories, cars and homes, the rain is becoming dangerous for the life of every living creature. This rain is known as ‘acid rain’. Acid gases are produced when fossil fuels like coal and oil are burned in power stations, factories and in our own homes. Most of these acid gases are blown into the sky, and when they mix with the clouds it can cause rain – or snow, sleet, fog, mist or hail – to become more acidic. The opposites of acid are alkalis; for example, toothpaste and baking powder are both alkalis. Strong alkalis can also be dangerous, such as ammonia and bleach. Lemon juice, vinegar and cola are all acidic. Rain is naturally acidic, but acid gases make it even more acidic, sometimes as acid as lemon! Nature can also produce acid gases, such as volcanoes. When they erupt, the smoke that comes out of the crater is also full of acid gases. Air pollution can be carried over long distances. When acid gases are released, they go high up in the sky, and then they are pushed by strong winds towards other countries. The acid rain in Sweden is caused by air pollution in Britain and other countries of Europe. The pollution produced in Britain ends up mostly in Scandinavia – countries in northern Europe including Sweden, Norway and Denmark. In the USA, the winds blow the air pollution to certain areas in Canada. When rain is acidic, it affects what it falls on: trees, lakes, buildings and farmland. Sometimes rain is not very acidic and does not cause a lot of problems, but when it is acidic, it can be very harmful to the environment. Acid rain can have terrible effects on a forest. The acid takes away important minerals from the leaves and the soil. Minerals are like vitamins for trees and plants. Without them, trees and plants cannot grow properly. They lose their leaves and become very weak. They are no longer strong enough to fight against illnesses and frost. They become very ill and can even die. Some soils are alkaline, when acid rain falls on them the acid becomes neutral. Plants and trees living on these soils are not in any big danger†¦ Acid rain has a terrible effect on water life. Even if the acid rain does not fall straight into the lake, for example, it may enter from rivers and streams. Some of the life in the lake such as fish and plants may end up dying, because they cannot survive in acidic lakes. Thousands of lakes in Scandinavia have no more life in them. They have received so much acid rain for so many years, because of the winds pushing the acid gases, which nothing can survive. You can recognise a lake dead from acid rain by its clean and crystal clear water. But they look clean because there is very little living in them anymore. Tiny plants and animals are mostly unable to survive†¦ Particulates – very small particles of debris found in some of the air pollution – are one of the main causes of health problems. In towns and cities, these are released mainly by diesel engines from cars and trucks. When we breathe in air pollution, these very fine particulates can easily enter our body, where they can cause breathing problems, and over time even cause cancer. Water we drink from taps can be contaminated by acid rain, which can damage the brain†¦ Acid rain can also ruin buildings because the acid eats into metal and stone. It also damages stained glass and plastics. Some types of building materials are softer than others, and it is the softer ones which are most affected by acid rain. Sandstone and limestone are examples of stone which are fairly soft and are damaged easily. Granite is an example of a harder stone that can resist the effects of acid rain. In many places in the world, ancient and famous buildings and monuments are affected by acid rain. For example, the Statue of Liberty in New York, USA, has had to be restored because of acid rain damage. Buildings are naturally eroded by rain, wind, frost and the sun, but when acidic gases are present, it speeds up the erosion. How to cite Acid Rain, Essay examples Acid Rain Free Essays We all live on the planet that provides us everything; we do not go anywhere else for anything. We get all we need on Earth. It might sound odd but its true and we take it for granted. We will write a custom essay sample on Acid Rain or any similar topic only for you Order Now In certain cultures, the Earth is called Mother Earth. We have been around for millions of years and we have been using the resources of our planet for our survival, from the last hundred odd years, we have started exploiting the resources of our planet more actively to make our lives comfortable. We basically use energy resources, but isn’t that all we need to survive? Energy is the key to survival, as humans. We need food for energizing our bodies and we need shelter to save us from the wrath of nature. However, in the last century we have been using the nature’s resources basically for our development and energy needs. We use coal, water, oil, land, forests and the sea for our energy needs. We also use renewable resources like wind and solar energy. Moreover, in big dams across the world we recycle water, the three gorges dam being made in china is an example of humans winning over nature, with its 2-mile long wall that stops the river Yangtze, Chinese hope to get around 24000 Mwt of energy from 26 turbines. However, they have moved around a million people from over 600 sq km of area that is going to be submerged once the dam gets operational in 2009. Projects as big as the Three Gorges dam may have happened only now but for decades, we have been doing great things to show our strength against nature. All this show of strength has only made us exploit nature and we are not habilitating nature the way we are exploiting it. Climate change along with Acid rain is the reality of our developed world. Climate change occurs due to the excess heat that the industrialized world produces while acid rain occurs due to sulfur and nitrogen based residuals that are produced from industrial processes. When sulfur dioxide and nitrogen oxides are emitted into the atmosphere, they mix with the moisture to form clouds and when it rains, the sulfur and the nitrogen come down as rain. The reason for acid rain is the increased pollution but primarily the use of coal. Across the world, we use coal widely to produce electricity. The residuals are then emitted into the atmosphere through long and high chimneys that save the low-lying air over the city to carry that pollution. However, the same residual is in the layers above and is blown away to different areas. That is why acid rain usually does not affect the areas where it is produced; at times, it affects areas that are hundreds of kilometers away from the site of the pollution. How to cite Acid Rain, Papers

Plx Programming Book free essay sample

The PLC has input lines where sensors are connected to notify upon events (e. g. temperature above/below a certain level, liquid level reached, etc. ), and it has output lines to signal any reaction to the incoming events (e. g. start an engine, open/close a valve, etc. ) The system is user programmable. It uses a language called Relay Ladder or RLL (Relay Ladder Logic). The name of this language implies the fact that the control logic of the earlier days, which was built from relays, is being simulated. [edit]The PLCs purpose in life The PLC is primarily used to control machinery.A program is written for the PLC which turns on and off outputs based on input conditions and the internal program. In this aspect, a PLC is similar to a computer. However, a PLC is designed to be programmed once, and run repeatedly as needed. In fact, a crafty programmer could use a PLC to control not only simple devices such as a garage door opener, but their whole house, including turning lights on and off at certain times, monitoring a custom built security system, etc. We will write a custom essay sample on Plx Programming Book or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Most commonly, a PLC is found inside of a machine in an industrial environment.A PLC can run an automatic machine for years with little human intervention. They are designed to withstand most harsh environments a PLC will encounter. [edit]History of PLCs When the first electronic machine controls were designed, they used relays to control the machine logic (i. e. press Start to start the machine and press Stop to stop the machine). A basic machine might need a wall covered in relays to control all of its functions. There are a few limitations to this type of control. Relays fail. The delay when the relay turns on/off. There is an entire wall of relays to design/wire/troubleshoot.A PLC overcomes these limitations, it is a machine controlled operation. [edit]Recent developments PLCs are becoming more and more intelligent. In recent years PLCs have been integrated into electrical networks i. e. all the PLCs in an industrial environment have been plugged into a network which is usually hierarchically organized. The PLCs are then supervised by a control center. There exist many proprietary types of networks. One type which is widely known is SCADA (Supervisory Control and Data Acquisition). [edit]Basic Concepts [edit]How the PLC operatesThe PLC is a purpose-built machine control computer designed to read digital and analog inputs from various sensors, execute a user defined logic program, and write the resulting digital and analog output values to various output elements like hydraulic and pneumatic actuators, indication lamps, solenoid coils etc. [edit]Scan cycle Exact details vary between manufacturers, but most PLCs follow a scan-cycle format. Overhead Overhead includes testing I/O module integrity, verifying the user program logic hasnt changed, that the computer itself hasnt locked up (via a watchdog timer), and any necessary communications.Communications may include traffic over the PLC programmer port, remote I/O racks, and other external devices such as HMIs (Human Machine Interface s). Input scan A snapshot of the digital and analog values present at the input cards is saved to an input memory table. Logic execution The user program is scanned element by element, then rung by rung until the end of the program, and resulting values written to an output memory table. Output scan Values from the resulting output memory table are written to the output modules. Once the output scan is complete the process repeats itself until the PLC is powered down.The time it takes to complete a scan cycle is, appropriately enough, the scan cycle time, and ranges from hundreds of milliseconds (on older PLCs, and/or PLCs with very complex programs) to only a few milliseconds on newer PLCs, and/or PLCs executing short, simple code. [edit]Basic instructions Be aware that specific nomenclature and operational details vary widely between PLC manufacturers, and often implementation details evolve from generation to generation. Often the hardest part, especially for a beginning PLC programm er, is practicing the mental ju-jitsu necessary to keep the nomenclature straight from manufacturer to manufacturer. Positive Logic (most PLCs follow this convention) True = logic 1 = input energized. False = logic 0 = input NOT energized. Negative Logic True = logic 0 = input NOT energized False = logic 1 = input energized. Normally Open (XIC) eXamine If Closed. This instruction is true (logic 1) when the hardware input (or internal relay equivalent) is energized. Normally Closed (XIO) eXamine If Open. This instruction is true (logic 1) when the hardware input (or internal relay equivalent) is NOT energized. Output Enable (OTE) OuTput Enable. This instruction mimics the action of a conventional relay coil.On Timer (TON) Timer ON. Generally, ON timers begin timing when the input (enable) line goes true, and reset if the enable line goes false before setpoint has been reached. If enabled until setpoint is reached then the timer output goes true, and stays true until the input (enable) line goes false. Off Timer (TOF) Timer OFF. Generally, OFF timers begin timing on a true-to-false transition, and continue timing as long as the preceding logic remains false. When the accumulated time equals setpoint the TOF output goes on, and stays on until the rung goes true.Retentive Timer (RTO) Retentive Timer On. This type of timer does NOT reset the accumulated time when the input condition goes false. Rather, it keeps the last accumulated time in memory, and (if/when the input goes true again) continues timing from that point. In the Allen-Bradley construction this instruction goes true once setpoint (preset) time has been reached, and stays true until a RES (RESet) instruction is made true to clear it. Latching Relays (OTL) OuTput Latch. (OTU) OuTput Unlatch. Generally, the unlatch operator takes precedence.That is, if the unlatch instruction is true then the relay output is false even though the latch instruction may also be true. In Allen-Bradley ladder logic (and others) latch and unlatch relays are separate operators. However, other ladder dialects opt for a single operator modeled after RS (Reset-Set) flip-flop integrated circuit chip logic. Jump to Subroutine (JSR) Jump to SubRoutine For jumping from one rung to another the JSR (Jump to Subroutine) command is used. [edit]Wikibooks Links Programmable Logic [edit]External links Wikipedia:Programmable logic controller Ladder logic IEC 61131-3 PLC programming language standards SCADA Others: Introductory PLC PLC Complete Tutorial PLC tutorial site for beginners PLC simulator Management of your companys PLC Timeline of PLC History Basic PLC Online PLC Training Interview with Dick Morley (pdf) PLC Books Logic to Ladder Diagram (pdf) Subjects: Introductory PLC Programming | Computer engi neering What do you think of this page? Please take a moment to rate this page below. Your feedback is valuable and helps us improve our website.