Buod Ng Tigre Tigre free essay sample

More formally, a function is defined as a set of finite lists of objects, one for each combination of possible arguments. In each list, the initial elements are the arguments, and the final element is the value. For example, the  Ã‚  function contains the list  , indicating that integer successor of  Ã‚  is  . A relation is another kind of interrelationship among objects in the universe of discourse. More formally, a  relation  is an arbitrary set of finite lists of objects (of possibly varying lengths). Each list is a selection of objects that jointly satisfy the relation. For example, the lt; relation on numbers contains the list  , indicating that  Ã‚  is less than  . Note that both functions and relations are defined as sets of lists. In fact, every function is a relation. However, not every relation is a function. In a function, there cannot be two lists that disagree on only the last element. This would be tantamount to the function having two values for one combination of arguments. We will write a custom essay sample on Buod Ng Tigre Tigre or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page By contrast, in a relation, there can be any number of lists that agree on all but the last element. For example, the list  Ã‚  is a member of the  Ã‚  function, and there is no other list of length 2 with  Ã‚  as its first argument, i. e. there is only one successor for  . By contrast, the lt; relation contains the lists  ,  , and so forth, indicating that  is less than  ,  , and so forth. Many mathematicians require that functions and relations have fixed arity, i. e they require that all of the lists comprising a function or relation have the same length. The definitions here allow for functions and relations with variable arity, i. e. t is perfectly acceptable for a function or a relation to contain lists of different lengths. For example, the + function contains the lists  Ã‚  and  , reflecting the fact that the sum of  Ã‚  and  Ã‚  is  Ã‚  and the fact that the sum of  Ã‚  and  Ã‚  and  Ã‚  is  . Similarly, the relation lt; contains the lists  Ã‚  and  , reflecting the fact that  Ã‚  is less than  Ã‚  and the fact that  Ã‚  is less than  Ã‚  and  Ã‚  is less than  . This flexibility is not essential, but it is extremely convenient and poses no significant theoretical problems. Relation:  Ã‚  A relation is simply a set of ordered pairs. | A relation can be any set of ordered pairs.

The aging population of Japan Essay Example

The aging population of Japan Essay Example The aging population of Japan Paper The aging population of Japan Paper Japan is the oldest Nation in the world. The percentage of the population above 65 years is 19. 7%, which is 25. 2 million Japanese. This is higher than most of the other aging countries such as Italy 19. 6%, Germany 18. 6%, and France 16. 3%. This percentage has increased drastically since 1950 when it was 4. 9% and it is expected to reach 36. 5% by 2050. This obviously have a huge impact on the over all dependency ratio. 1 The average life expectancy in Japan is 81. 6 (77. 9 for males and for 85. 1 for females). In 2002 Japan was recorded to have the highest life expectancy compared to other developed countries such as USA, 77. 1 and Switzerland 79. 1. Japan, a country which had a life expectancy below most developed countries in the 1950, 63. 9, (partly due to World War II) has made advances in medical technology and improvements in sanitation. The increase in recent years is also due the fact that there havent been any major outbreaks of flu or other infectious diseases. Japans life expectancy is expected to increase to 88. 1 by the year 2050. Japan is becoming older and is losing its youth. The percentage of children aged 0-14 will be 14% of the entire population in 2005. This figure is slowly is slowly decreasing and has been for 50 years (1950s percentage was 35. 4%). This is because of the reduced fertility; people are too busy and decide to have children late. Japanese people work 1966 hours a year that is about 300 more hours of work than the Germans, who work on average 1590 hours per year. 2 More and more women are receiving higher education, 48% of the women continue on to higher education whereas only 42% of the men go on to higher education. Women who get a job and go on to higher wages dont want to get married and because if they dont get married they gather seniority therefore getting more pay. (The starting pay for men and women is about the same) 3 In the 1950s Japan had a population pyramid similar to the developing countries of today which is called expansive. Its population then was 83. 2 million. It had a large base to the mini baby boom between 1947 and 1949. Although there was a significantly large fall in each of the upward age groups due to high death rates and short life expectancy. The shortfall in the age group 30-39 was due to the casualties of World War II. Japans population pyramid started to look more like a developed country in the years to come; the base became smaller and the life expectancy rose rapidly. Japans population pyramid of 2000, is similar to most developing countries although it might soon plunge into the next stage very soon. Sweden which has reached a stage further than most developed countries has fertility as low as Japan. Sweden which once had one of the highest fertility rates is now falling rapidly. Its population in 2000 was 126. 9 million (more accurate population pyramid for 2000 at end of the essay). The population of Japan has not started to decline yet although it is bound to happen very soon. The population grew just 0. 17% in 2002. If the growth rate continues to shrink at its current pace the population will reach its peak by the year 2007. Also by 2007 the percentage of people aging above 65 will reach 20%, it will be the first country to do so. This is Japans population pyramid prediction for 2050. Its population will have started to decline considerably. More than one third of the population will be above 65 whereas only 13% of the population will be below 15 years. By then Japan would have gone through several problems due to its aging community. Demographers have predicted that 36. 5% of the population will be 65+. This is a national average; some regions in Japan will have a low aging population whereas others will have a high aging population. It has also been projected that by 2025 there will be communities where 80%+ of the population is 65 and over. This is also reflected in the median age of Japans population is relatively high compared to other countries, 42. 8. This obviously has an affect on the dependency ratio. Right now the elderly dependency ration alone (child dependency ratio is with children under 15) is about 30%. That would mean three working age people would have to support one elder. This is projected to increase rapidly in the coming years. In 2050 demographers expect the dependency ratio to be three people from the working population to support two elderly people. Tax revenues will cause problems for the working population, which therefore create problems for the government because of its huge deficit. .. There are several ways the government could control the aging population, although this would cost a lot. I think that the government should provide incentives for large families, two or more children so that the population should increase slowly and therefore increasing the youth population, raising fertility. This although take a long time, and couples would have to have time to take for the children and the hours of work would have to be reduced. The Government have been trying to reduce number of hours worked a year so that people that have more time to spend with their children. Another idea to increase the young population and have people have more children would be to import people from developing countries (probably skilled so that they would be able to level up to Japanese standards or they might just have people to do civil work). This would probably have an affect on the population, the people coming from outside would have larger families, even though the work load is hard because they believe that they should have a lot of children, therefore increasing the under 15 population. There is also the negative fact that the young generations might start bring dominantly foreigners. It the population is aging and it is hard to cope with, then they might as well move, export the aging people out, which has been happening recently. This would reduce the tax revenues on old people, and make the population younger. This of course not easy to do due to the cost needed to move the old people and etc. Increasing retirement age will not in theory affect the aging population; it would just reduce taxes for elder. Although this might have a physiological affect on the population and they might think of having children. The population might appreciate working for an extra 10 years or more, and hence it is not easy to pass such a law. People might be getting married, or living together and be sexually active but children are not being born because of contraceptives and abortion. Abortion should be made illegal, making people have children if they are pregnant. This might not have a great affect on the population, but it might stabilize the under 15 population or might even slowly increase. The problem is that if Japan continues like this and doesnt have more children and the percentage of people over 65 increases at a steady speed, the dependency ratio is going to be a one point is very close to one to one. This mean that the government will not be able to raise tax revenues to make the working population support the elders, but instead the population above 65 will have to support themselves, get their own medications. This means that the current working population will have to start saving up money because the government wont be able to pay for them. Thus the working population wont be able to spend money on children and remain childless, decreasing the population. (Didnt use this graph because you couldnt see the labels on a small scale). Country Year Child-dependency ratio Elderly-dependency ratioTotal dependency ratio Median age (years) Â  http://esa. un. org/unpp/index. asp? panel=2 (2005) 2 mofa. go. jp/j_info/japan/socsec/ogawa. html 3 mofa. go. jp/j_info/japan/socsec/ogawa. html Pictures- hino. meisei-u. ac. jp/econ/fnet/indexi. html.

How can an oil spill destroy a marine ecosystem Essay

How can an oil spill destroy a marine ecosystem - Essay Example The problem is worth discussing; thus, the given paper will analyze the effect of oil spills on marine life (Smith, 2013). The scale of oils spills is large because besides the officially recognized sources of spills, there are additional pollutants connected with everyday humans’ activity. Much of dirt including oils is transferred to seas by means of storm drains. Natural leakage of oils also contributes to this kind of pollution. Serious harm is done to the world oceans when the large amount of oil is spilt into the sea at once. It is especially dangerous for marine life as in this case the sea does not have enough time to recover. As West puts it, â€Å"Despite massive clean-up efforts following the  Exxon Valdez oil spill  in 1989, for example, a 2007 study conducted by the National Oceanic and Atmospheric Administration (NOAA) found that 26, 000 gallons of oil from the Exxon Valdez oil spill was still trapped in the sand along the Alaska shoreline† (West, n.d. ). When oil appears in the sea, some of volatiles are evaporated at once, while the oil forms a pellicle that swims in the water and can sweep large areas. Certainly, marine animals and fish, which appear near this pellicle, can be impacted negatively. First of all, the species, which live in the water and consume vegetation, can suffer because oil impedes the oxygen entering and prevents water exchange that causes the death of vegetation consumed by fish and marine animals. This leads to death from starvation (Smith, 2013). Animals and birds, which appear in the oil film, smudge with oil, and since oil coating cannot be easily eliminated, they can die from loosing the water resistance of their coats. Flying birds can also be smudged that prevents them from normal flying. â€Å"Some animals are more vulnerable to oil than others. For example, young may be less able to deal with either coatings or exposure to toxic substances than adults due to their size, underdeveloped immune syst ems and behaviors. Marine mammals, seabirds (especially penguins) and  sea turtles  are all particularly vulnerable to oil on surface waters as they spend considerable amounts of time on the surface feeding, breathing and resting† (â€Å"Effects of oil on marine life,† n.d.). Oysters and mussels can be also smudged with oil that kills the animals, which consume them. What is more awful is that these species can appear on our table. Such cases have been already met: some people complained that marine products tasted oily. Thus, not only animals, but also people are in risk to consume marine products smudged in oil. Gulping oil is also dangerous for marine species and can lead to long term consequences including the violation of reproductive function, ability to grow, etc. â€Å"Fish and shellfish may not be exposed immediately, but can come into contact with oil if it is in the water column. When exposed to oil, adult fish may experience reduced growth, enlarged liv ers, changes in heart and respiration rates, fin erosion, and reproduction impairment. Oil also has effects on eggs and larval survival† (â€Å"Oil spills can be ...,† n.d.). Thus, it is clear that oil spilt in the water causes more series damage than oil spilt on land as it is not easy to trace it, and also it can cover large areas due to oil film formation. Animals and birds which