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Showing posts with label BC. Show all posts
Showing posts with label BC. Show all posts
Saturday, 5 October 2013
08:12
librarysbbu
The causes of noise pollution
Noise and pollution, and man was created noise harmful to health or welfare. Transport vehicles are the worst offenders, with aircraft, rail, trucks, buses, cars and motorcycles for producing excessive noise. Construction equipment, for example, breaker and bulldozers, also produce substantial noise pollution.
There are some of the main causes and there dreadful effect of the noise such as:
Friday, 4 October 2013
08:10
librarysbbu
Global Warming
Global warming is the greatest challenge facing our planet. It is, in fact, the increase in the temperature of the earth’s neon- surface air. It is one of the most current and widely discussed factors. It has far-reaching impact on biodiversity and climatic conditions of the planet. Several current trends clearly demonstrate that global warming is directly impacting on rising sea levels, the melting of ice caps and significant worldwideclimate changes. In short, global warming represents a fundamental threat to all living things on earth.
Global average temperature rose significantly during the past century. The prevailing scientific view is that most of the temperature increases since mid-20th century has been caused by increases in atmospheric greenhouse gas concentrations produced by human activity. Most scientists agree that planet’s temperature has risen 0.5 degree Celsius since 1900 and will continue to increase at an increasing rate. As a result, the world is getting warmer. The year 1990 was the hottest year in the last century.
Together with 1991, the years of 1983, 1987, 1988 and 1989 have been measured to be the warmest six years in the last hundred years. The year 1991 was the second warmest year of the past century. The consequences of the rise in temperature is being felt all over the globe the findings of scientific research done in this field reveal that the temperature of the earth is likely to rise from 1.4°C to 5.8°C within a period of 100 years.
Unfortunately, the imbalance which we have created between our life and earth is already showing the signs disasters in the form of flood, cyclones, landslides, tsunami, drought, etc. If the imbalance continues to rise, one day this will pose a question mark on the existence of this planet. Carbon dioxide (C02) which is an important constituent of environment is causing a warming effect on the earth’s surface.
CAUSES AND EFFECTS OF GLOBAL WARMING
1. Global Warming Cause: Carbon dioxide emissions from fossil fuel burning power plants
Our ever increasing addiction to electricity from coal burning power plants releases enormous amounts of carbon dioxide into the atmosphere. 40% of U.S. CO2 emissions come from electricity production, and burning coal accounts for 93% of emissions from the electric utility industry [EPA, pg. 10]. Every day, more electric gadgets flood the market, and without widespread alternative energy sources, we are highly dependent on burning coal for our personal and commercial electrical supply.
2. Global Warming Cause: Carbon dioxide emissions from burning gasoline for transportation
Our modern car culture and appetite for globally sourced goods is responsible for about 33% of emissions in the U.S. [EPA pg. 8] With our population growing at an alarming rate, the demand for more cars and consumer goods means that we are increasing the use of fossil fuels for transportation and manufacturing. Our consumption is outpacing our discoveries of ways to mitigate the effects, with no end in sight to our massive consumer culture.
3. Global Warming Cause: Methane emissions from animals, agriculture such as rice paddies, and from Arctic seabeds
Methane is another extremely potent greenhouse gas, ranking right behind CO2. When organic matter is broken down by bacteria under oxygen-starved conditions (anaerobic decomposition) as in rice paddies, methane is produced. The process also takes place in the intestines of herbivorous animals, and with the increase in the amount of concentrated livestock production, the levels of methane released into the atmosphere is increasing. Another source of methane is methane clathrate, a compound containing large amounts of methane trapped in the crystal structure of ice. As methane escapes from the Arctic seabed, the rate of global warming will increase significantly.
4. Global Warming Cause: Deforestation, especially tropical forests for wood, pulp, and farmland
The use of forests for fuel (both wood and for charcoal) is one cause of deforestation, but in the first world, our appetite for wood and paper products, our consumption of livestock grazed on former forest land, and the use of tropical forest lands for commodities like palm oil plantations contributes to the mass deforestation of our world. Forests remove and store carbon dioxide from the atmosphere, and this deforestation releases large amounts of carbon, as well as reducing the amount of carbon capture on the planet.
5. Global Warming Cause: Increase in usage of chemical fertilizers on croplands
In the last half of the 20th century, the use of chemical fertilizers (as opposed to the historical use of animal manure) has risen dramatically. The high rate of application of nitrogen-rich fertilizers has effects on the heat storage of cropland (nitrogen oxides have 300 times more heat-trapping capacity per unit of volume than carbon dioxide) and the run-off of excess fertilizers creates ‘dead-zones’ in our oceans. In addition to these effects, high nitrate levels in groundwater due to over-fertilization are cause for concern for human health.
6. Global Warming Effect: Rise in sea levels worldwide
Scientists predict an increase in sea levels worldwide due to the melting of two massive ice sheets in Antarctica and Greenland, especially on the East coast of the U.S. However, many nations around the world will experience the effects of rising sea levels, which could displace millions of people. One nation, the Maldives, is already looking for a new home, thanks to rising sea levels.
Thursday, 3 October 2013
07:55
librarysbbu
1. Introduction :
Energy is considered to be life line of any economy and most vital instrument of socioeconomic development of a country. Energy is pivotal in running machinery in factories and industrial units, for lighting our cities and powering our vehicles etc.
There has been an enormous increase in the demand of energy as a result of industrial development and population growth, in comparison to enhancement in energy production. Supply of energy is, therefore, far less than the actual demand, resultantly crisis has emerged. An energy crisis can be defined as any great bottleneck (or price rise) in the supply of energy resources to an economy.
2. Pakistan’s Energy Sector:
Pakistan’s energy infrastructure is not well developed, rather it is considered to be underdeveloped and poorly managed. Currently the country is facing severe energy crisis. Despite of strong economic growth and rising energy demand during past decade, no serious efforts have been made to install new capacity of generation. Moreover, rapid demand growth, transmission losses due to outdated infrastructure, power theft, and seasonal reductions in the availability of hydropower have worsened the situation. Consequently, the demand exceeds supply and hence load-shedding is a common phenomenon through power shutdown.
2.1 Energy Supply :
During 2009-10, Energy supply and per capita availability of energy witnessed a decline of 0.64 % and 3.09 % respectively in comparison to previous year.
Pakistan needs around 15,000 to 20000 MW electricity per day, however, currently it is able to produce about 11,500 MW per day hence there is a shortfall of about 4000 to 9000 MW per day. This shortage is badly hampering the economic growth of the country.
2.2 Energy Consumption :
Pakistan’s energy consumption is met by mix of gas, oil, electricity, coal and LPG sources with different level of shares. Share of gas consumption stood at 43.7 %, followed by oil 29.0 percent, electricity 15.3 percent, coal 10.4 percent and LPG 1.5 percent.
3. Sources of Energy in Pakistan:
Wednesday, 2 October 2013
07:49
librarysbbu
DEMOCRACY (OXFORD)
Greek, ‘rule by the people’. Since the people are rarely unanimous, democracy as a descriptive term is synonymous with majority rule. In ancient Greece, and when the word was revived in the eighteenth century, most writers were opposed to what they called democracy. In modern times, the connotations of the word are so overwhelmingly favourable that regimes with no claim to it at all appropriated it (the German Democratic Republic, Democratic Kampuchea). Even when not used emptily as propaganda, ‘democracy’ and ‘democratic’ are frequently applied in ways which have no direct connection with majority rule: for instance, The Democratic Intellect (G. E. Davie) is a well-known discussion of the (supposed) egalitarianism of the Scottish educational system in the nineteenth century. Such uses of ‘democracy’ to mean ‘what I approve of ’ are not considered further here. Issues relating to majority rule include:
(1) Who are to count as ‘the people’ and what is a ‘majority’ of them? Ancient Athens called itself a democracy (from c.500 bc to c.330 bc) because all citizens could take part in political decisions. But women, slaves, and resident aliens (including people from other Greek cities) had no rights to participate. Citizens were thus less than a quarter of the adult population. Modern writers have nevertheless accepted the self-description of classical Athens as ‘democratic’ (see also Athenian democracy). Likewise, well under half the adult population of the United Kingdom had the vote before the first women were enfranchised in 1918; but 1918 is not usually given as the year in which Britain became a democracy. What minimum proportion of adults must be enfranchised before a regime may be called democratic? This simple question seems to lack simple answers.‘Majority’ appears to be more clear-cut than ‘people’; it means ‘more than half ’. In votes between two options or candidates this poses no difficulty; in votes among three or more it does. The difficulty was studied by various isolated people (Pliny the Younger, c. ad 105; Ramon Lull in the thirteenth century; Nicolas Cusanus in the fifteenth) but first systematically tackled by Borda and Condorcet in the late eighteenth century. The plurality rule (‘Select the candidate with the largest single number of votes, even if that number is less than half of the votes cast’) may select somebody whom the majority regard as the worst candidate. Nevertheless, countries using this rule for national elections (including Britain, the United States, and India) are normally described as ‘democratic’. Borda proposed to select the candidate with the highest average ranking; Condorcet proposed to select the candidate who wins in pairwise comparisons with each of the others. Although these are the two best interpretations of ‘majority rule’ when there are more than two candidates, they do not always select the same candidate; and the Condorcet winner—that is, the candidate who wins every pairwise comparison—sometimes does not exist. In this case, whichever candidate is chosen, there is always a majority who prefer some other, and the meaning of ‘majority rule’ is unclear.Voting in legislatures is usually by the binary resolution-and-amendment procedure, which always ensures that the winning option has beaten its last rival by a majority (but does not solve the problems mentioned in the previous paragraph).
(2) Why (if at all) should majorities rule minorities? The first argument for democracy in ancient Greece is that attributed by Thucydides to Pericles, one of the democratic leaders of Athens, in 430 bc. Pericles argued that democracy is linked with toleration, but made no special claims for majority rule. Plato and Aristotle both deplored democracy, Plato on the grounds that it handed control of the government from experts in governing to populist demagogues and Aristotle on the grounds that government by the people was in practice government by the poor, who could be expected to expropriate the rich. However, Aristotle did first mention as a justification of majority rule that ‘the majority ought to be sovereign, rather than the best, where the best are few…. [A] feast to which all contribute is better than one given at one man's expense.’ In medieval elections, the usual phrase was that the ‘larger and (or “or”) wiser part’ ought to prevail. But every losing minority could claim that it was the wiser part. Only in the seventeenth century did a defence of democracy based on an assumption of equal rights for all citizens begin to re-emerge, perhaps as a by-product of the Protestant Reformation. Hobbes and Locke both assume the political equality of citizens, but neither draws explicitly democratic conclusions. A stronger claim of equality was asserted by Colonel Rainborough of Cromwell's army in 1647, with his claim that the ‘poorest hee that is in England hath a life to live, as the greatest hee’.Significant widening of the franchise in Western regimes began in the late eighteenth century. In the French Revolution, the franchise was at first restricted to fairly substantial property-holders, but it was widened to something approaching manhood franchise in the constitution of 1791 and the proposed constitution of 1793. Many of the American colonies had broad suffrage before 1776, and the Constitution of 1787 lays the groundwork for democracy in federal elections by giving each state representation in the House and in presidential elections in proportion to its population (except for Indians and slaves). Except between 1865 and the 1890s, however, Southern blacks remained disenfranchised until 1965. The first British act to widen the franchise was in 1832; universal suffrage was achieved in 1928. The leading commentators of the period from 1780 to 1920 all accepted the basic premiss that the ‘poorest hee’ (and for Condorcet and J. S. Mill the poorest she) had as good a right to a vote as the richest, although many of them were concerned about the ‘tyranny of the majority’ (see 4 below) and Mill proposed weighting votes in favour of the richer and the better-educated. (See also Madison; Tocqueville.)Another strand of democratic thought argues from equal competence rather than equal rights. This revives Aristotle's feast. Democrats who see politics as a matter of judgement rather than opinion (including Rousseau and Condorcet) argue that, other things being equal, the more people who are involved in arriving at a decision the more likely the decision is to be correct. Condorcet formalized this in his jury theorem, which states that, providing a large enough majority is required, a large number of only moderately competent people can be relied on to take the right decision.
Friday, 27 September 2013
08:13
librarysbbu
You have been offered a job in a firm. Write a letter of acceptance.
Job Acceptance Letter
80-A Omer Hayat BlockICOBHS, MIT Road
Lahore
27 November 1997
Mr. Omer Iman
Director HR
X.Y.Z. Karachi
Dear Sir
JOB ACCEPTANCE LETTER
Reference is made to your letter No. 262/59/Job dated 5 september,2008 confirming my position as director Finance in your esteemed organization. . It was my long cherished desire to be a part of your team and I extend my humble thanks to you and your organization for my selection.
I will join my service on 15th December as per mentioned in contract.
08:00
librarysbbu
PAKISTAN ARMY
The primary mandate and mission of the army is to "dedicated to the service of the nation."[4] Since establishment in 1947, the army (along with its inter–services: Navy, Marines and PAF) has been involved in four wars with neighboring India and several border skirmishes with Afghanistan. Since 1947, it has maintain strong presence, along with its inter-services, in the influential the Arab states during the past Arab-Israeli Wars, and aided the coalition in the first Gulf War. Recently, major joint-operations undertaken by the army include Operation Black Thunderstorm and Operation Rah-e-Nijat. Apart from conflicts, the army has been an active participant in UN missions and played a major role in rescuing trapped American soldiers from Mogadishu of Somalia in 1993 in Operation Gothic Serpent.
07:48
librarysbbu
Below are brief summaries of each of the ten steps to writing an essay.How To Write an Essay can be viewed sequentially, as if going through ten sequential steps in an essay writing process, or can be explored by individual topic.
1. Research:
Begin the essay writing process by researching your topic, making yourself an expert. Utilize the internet, the academic databases, and the library. Take notes and immerse yourself in the words of great thinkers.
2. Analysis:
Now that you have a good knowledge base, start analyzing the arguments of the essays you're reading. Clearly define the claims, write out the reasons, the evidence. Look for weaknesses of logic, and also strengths. Learning how to write an essay begins by learning how to analyze essays written by others.
3. Brainstorming:
Your essay will require insight of your own, genuine essay-writing brilliance. Ask yourself a dozen questions and answer them. Meditate with a pen in your hand. Take walks and think and think until you come up with original insights to write about.
4. Thesis:
Pick your best idea and pin it down in a clear assertion that you can write your entire essay around. Your thesis is your main point, summed up in a concise sentence that lets the reader know where you're going, and why. It's practically impossible to write a good essay without a clear thesis.
5. Outline:
Sketch out your essay before straightway writing it out. Use one-line sentences to describe paragraphs, and bullet points to describe what each paragraph will contain. Play with the essay's order. Map out the structure of your argument, and make sure each paragraph is unified.
6. Introduction:
Now sit down and write the essay. The introduction should grab the reader's attention, set up the issue, and lead in to your thesis. Your intro is merely a buildup of the issue, a stage of bringing your reader into the essay's argument.
07:42
librarysbbu
Definition of 'Inflation'
The rate at which the general level of prices for goods and services is rising, and, subsequently, purchasing power is falling. Central banks attempt to stop severe inflation, along with severe deflation, in an attempt to keep the excessive growth of prices to a minimum.In economics, inflation is a rise in the general level of prices of goods and services in an economy over a period of time. When the general price level rises, each unit of currency buys fewer goods and services. Consequently, inflation reflects a reduction in the purchasing power per unit of money – a loss of real value in the medium of exchange and unit of account within the economy. A chief measure of price inflation is the inflation rate, the annualized percentage change in a general price index (normally the consumer price index) over time.
07:40
librarysbbu
EDUCATION
The process of learning the skills that can give you benefit and can give you the unique set of characteristics is known as education. The Education cannot be limited to the study of science or arts only but in fact education is the process of learning the various set of behaviors, the various set of skills and the various aspects of life. It is very difficult to define the term “education” properly because it is an intangible concept. There are various indirect links of education or in other words this process can lead to some other processes as well like wisdom, intelligence, and the knowledge development.Importance Of Education
In each individual in the universe there are some of the inner hidden characteristics which can lead man to the heights of sky. The only thing required to get this aim is to expose your inner talent by searching yourself. An individual is like gold which is nothing without molding. As mentioned above the term education is not limited to a specific field but it is general term alternative to education.Stages Of Education
There are various ways through which a person gets the knowledge like early childhood education, which is also known as schooling. In this skills development program at the age of four or five years a small child is given the learning related to various subjects step by step and then the child is also trained about the religion from which he or she belongs. The moral values of the child are also shaped at each step of schooling. After this the late childhood development comes which is also a part of schooling.
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