Air and Water essays

Air and Water essays A major transition in the modern energy age began in the 1970s, when the big nations industry started to grow up rapidly. The use of oil was very important and overnight, oil prices shot through the roof, and the trend of ever-cheaper, ever-more-plentiful energy sources were in need. Another player on the modern energy stage is nuclear power. An industry that didn't exist 40 years ago is now at a huge amount of production, producing 20 percent of the nation's electricity. Ironically, the industry is fading out. New orders ceased 20 years ago, and as aging plants reach the end of their lives, they are closing, one by one. All the non-renewable energy resources have positive and negative affects to the nature. However Nuclear Energy is the most dangerous one, as we can see what happened in Chernobyl in 1986, and it is dangerous if the nations use Nuclear Energy to kill people like at the end of the world war. It is not a dream to think of solar power that is cheap enough for universal use a world full of zero-polluting electric cars. Wide-scale use of fuel cells for powering buses and other forms of public transport. Chicago and Vancouver are two cities which have pilot programs using fuel cells to power some of their public transport buses. Use of fossil fuels confined to petro-chemical products and fuel cell feedstock. Nuclear fusion or some other advanced nuclear process, supplying all base load power. (Solar) Also, there is continued interest and research into fusion power. Since fusion generates temperatures of millions of degrees, the main difficulty in developing fusion power has been in containing the heat of the reaction. Fusion is an expensive source of energy right now, but it might cost much cheaper in the near future. It is not very hard to guess that in the near future, all the energy sources will be much cheaper. The technology is changing almost everyday, it was not possible to dre ...

Should I choose online or classroom SAT prep

Should I choose online or classroom SAT prep SAT / ACT Prep Online Guides and Tips Like most things in life, the answer to this question is: it depends. In this case, it depends on what kind of learner you are, what your schedule looks like, how quickly you need to beef up your skills, and how much you (or your parents) want to pay. Online education is still young, trying to find its footing as technologies become more sophisticated and people become more connected to the internet 24/7. And SAT prep is also entering a phase of speedy evolution, as theCollege Boardannounced recently that willprovide free preparation for theredesigned testthat begins in the Spring of 2016. But if the College Board’s record for (lack of) transparency is any indication, the prep they provide will be incomplete at best. They've been providing "College Board Official Prep" for decades and certain students benefit from more than that. After all, their job is to present questions that can’t be â€Å"tricked†! So it’s important to keep on top of all your options, as you only have to take the test once if you prepare well. Like it or not, the SAT is probably an important factor in the direction of your post-high school life. A quick comparison of online and classroom SAT prep: Online Classroom where wherever you want major cities when whenever you want late (average weekday start time 7pm) or early (average weekend start time 8am) setting home, library, your choice high school and college classrooms customization fully customized algorithmic program* none timed practice 10 full practice tests* none (no time!) program design self-paced pre-planned (if you get sick, too bad!) upgrades every 2 weeks when the test changes (approx. every 10 years) progress tracking constant and precise none instructor availability 24/7 during class time (about 3-6 hours per week) feedback constant and updated very little *with PrepScholar When Classroom is Better: Of course, there are advantages to traditional classroom instruction that are difficult to quantify. There are some types of students who will do well in a classroom setting: students who require the presence of an authority figure to get anything done students who enjoy the high school experience students who aren’t much higher or lower than the average ability of the class students who are willing to ask every single question they have students who prefer pen-and-paper work to online work If you or your student(s) fall into a few of these categories, you may want to consider classroom preparation. But most students don’t. Obviously, online SAT prep has a ton of advantagesand its abilities are expanding every day. The bottom line is that most proponents of classroom teaching don’t know what technology is capable of. Most educators, in high schools and big prep companies, are middle-aged or older. Their experience with technology is limited at best. PrepScholar (time to toot our own horn!) is founded and staffed entirely by people who have been using computers our whole lives. The company was founded on the principle that technology can provide enriching, compelling educational experiences and we are constantly working to push the boundaries of what we can deliver. We aren’t the least biased authority on the advantages of online test prep, but we may be the best informed. Next Up: Should you take the New SAT or Old SAT? And if you found this interesting or helpful, sign up to the right to stay updated on the topics we think SAT preppers and their parents might find useful. Also, get our FREE SAT guide!

Report on photosynthesis lab Example | Topics and Well Written Essays - 2000 words

On photosynthesis - Lab Report Example Classically the effects of temperature on photosynthetic rates follow a parabolic relationship, with rates being low at extremely low and high temperatures and high at moderate temperatures (Rabinowitch and Govindjee, 1969). Consequent to this relationship, plant growth and productivity is often limited by extremes of temperature, with either too low or high temperatures affecting the growth and productivity of plants (Rabinowitch and Govindjee, 1969; Govindjee, 1975). Obviously it appears that extremes of temperature could adversely affect the apparent photosynthetic rate of leaves. Further, while tissue respiration rates may remain unaltered under extreme temperatures, decrease in the photosynthetic rates can lead to a negative carbon balance in the plant (Hipkins, 1987). Under such conditions, the growth and productivity and consequently the adaptability of plants would be jeopardized. These arguments pre-suppose that plant species in nature have an optimum temperature at which th eir photosynthetic rates are maximized. Extreme temperatures either too low or too high depress the photosynthetic rates. In recent years, there has been renewed interest in evaluating plant responses to elevated temperature owing to the green house effect. In this paper we explicitly examine the hypothesis that within a limited range of temperatures, the photosynthetic rates of leaves would scale positively with temperature. We discuss the results in the light of existing knowledge on the role of temperature in influencing apparent photosynthetic rates in species and how such relation could have implications for plant growth and productivity. Materials and Methods Rationale of the experiment The experiments were performed on spinach leaf disks. Leaf disks contain spongy mesophyll layer of cells, which largely comprise of large air spaces. By depleting the air spaces under vacuum, the leaf disks sink in water. However, under sufficiently lighted conditions when the leaf disks photosynthesize, the air spaces are refilled with oxygen (a product of photosynthetic oxygen evolution) and tend to float again. The rate at which the leaf disks begin to float can be used as a surrogate measure of the photosynthetic rate of the leaf disks. Thus leaf disks that fail to float are those in which photosynthetic oxygen evolution has not occurred (and hence in which photosynthesis is absent). On the other hand and keeping everything else constant, it can be inferred that leaf disks that float slowly are those were the photosynthetic rates are relatively slow compared to disks that float rapidly. Preparation of leaf disks for incubation Leaf disks were made using a hole puncher. About 60 leaf disks were prepared from 2 or 3 fresh leaves of spinach at each effort. With the help of a surgical syringe, air was removed from the spongy tissue of the leaf disks by creating vacum and replaced with sodium bicarbonate solution (0.2 percent w/v). After this process, most of the disks sink to the bottom of the syringe, indicating that in these disks the air spaces were successfully evacuated and replaced with bicarbonate solution. Disks that remained afloat were discarded. The sunken disks were transferred to fresh sodium bicarbona

Unti 3 Coursework Example | Topics and Well Written Essays - 500 words

Unti 3 - Coursework Example the living organisms, thus, although their sources are from non-living organisms, proper amount which is commonly in trace contents in food are fundamental to the health and nutrition of the people. In amounts that are above or below that of the recommended intake, certain health conditions can be incurred (Table 1). Some of the essential macro and trace minerals are calcium, chromium, copper, fluoride, iodine, iron, magnesium, manganese, molybdenum, phosphorus, potassium, selenium, sodium, and zinc (Linus Pauling Institute). The data presented are some of the trace minerals. It can be considered that although the said macro and trace chemicals are present in such a small amount, absence can greatly affect the functioning of the organ systems of humans. Chromium is one of the most interesting minerals due to the fact that it can occur as a toxin that can greatly damage the human body while at the same time recognized as an essential mineral. Due to the damaging and disruptive effects of chromium as a heavy metal, it had been recognized as a carcinogen. In trace amounts though, it functions in immunostimulation and immunosuppression which are both essential for control in the processes of the immune system (Shrivastava et al. 1). Based on the study of the nutritional condition of the populations in different regions specifically the US, it can be considered that information dissemination and the proper distribution of knowledge regarding nutritional habits and techniques to be able to improve the health of the population. In addition, balanced diet that is composed of different nutrients and minerals can still be considered as the simplest way to be able to improve and maintain

LAND OF OPPORTUNITY Essay -- essays research papers

United States of America Land of Opportunity?   Ã‚  Ã‚  Ã‚  Ã‚  United States of America is known as the land of opportunity for many immigrants who dare to dream of a better life. Since the beginning of American history, United States has focused more about equal opportunity than any other country. There are many people who strongly believe that once they come to the United States it is almost guaranteed to find success. For example, my relatives in Korea always ask my parents how much my family has earned so far. Also, they believe that we live in a totally different world, living the American dream. However, it seems like this country is no longer the land of opportunity for those who are immigrants and the low class people.   Ã‚  Ã‚  Ã‚  Ã‚  Many immigrants come to United States to achieve their America Dreams as my family did a few years ago. They think that they can get high-paying jobs easily, but the reality is not. According to an article, The Land of Opportunity? (Los Angeles business Journal, 1999), immigrants cannot get opportunities for high-paying jobs because: â€Å"The limited number of manufacturing jobs that they might have moved into in previous generations†; â€Å" The need for specialized training in many of jobs†; and â€Å"The lack of union-style apprentice program.† The article also says that many Los Angeles’ poor families are concentrated among recently arrived immigrant groups, most of them Latino, 600,000 or so Kim02 in Los Angeles count...

Ancient civilization Essay

Ancient civilization was characterized with a culture that was rich in content, and embraced all aspects of human life. Religion for instance was so much emphasized as the basic support to human life. Assyrian winged protective deities were Egyptian religious figures. The chapel of Sekhem-ank-ptah is another unique aspect of history and has its weight on the wall hangings which had various writing inscribed on them. Lamassu, which is also known as lama is one of the Assyrian deities which had an obligation of protecting the people. This religious power existed between C883-613 in the Assyrian territory. The religious wall hangings found in the chapel of sekhen-ank-ptah has close similarity to Lama. All of them existed to in the ancient days with the wall hangings dating back to 2450 to 2350 BC. The region of existence of the wall hangings was however Sakkara in the late dynasty 5 (Tomasi, M. 2006). The two unique powers had varying representations. Lama was displayed as a large bull with horns and was always placed as a monument at the entrance of palaces. The gender of Lama was of the form of human males. Great artists always confirmed that the Assyrian deities with wings were actually apotropaic figures. Wall hangings on the other hands were made using thick papyrus which was obtained from swamps, lots of drawings were posted on the wall hangings and these drawings had various interpretations of divine nature. One similarity however is the material used to make them. All were made using sacred items. Lamassa represented a standing figure and served as a servant to a superior god. This meant that all visitors of the superior god were welcomed by the lame. Lama also had one great duty of protecting people against evil forces. The wall hangings on the other hands acted as a reminder of the baths to be taken in life. Some parts of the wall; hanging represented the process of giving offerings in church. The pictures had diagrams of animals in motion. Al these had interpretation. For example, the wall hanging on butchers at work and that showing plants in the field had an interpretation that the people were mainly farmers. Generosity in terms of giving food is also an output obtained form this diagram. The ancient Assyrian people believed in these symbols of deity and followed the beliefs carefully. Any violation of the precepts was believed to bring curses both then and the generation that followed

Urban Farming - 1169 Words

Open main menu Search Wikipedia Edit Watch this page Urban agriculture An urban farm in Chicago Urban agriculture, urban farming or urban gardening is the practice of cultivating, processing, and distributing food in or around a village, town, or city.[1] Urban agriculture can also involve animal husbandry, aquaculture, agroforestry, urban beekeeping, and horticulture. These activities occur in peri-urban areas as well, and peri-urban agriculture may have different characteristics.[2] Urban agriculture can reflect varying levels of economic and social development. In the global north, it often takes the form of a social movement for sustainable communities, where organic growers, ‘foodies,’ and ‘locavores’ form social networks†¦show more content†¦A very similar practice came into use during the Great Depression that provided a purpose, a job, and food to those who would otherwise be without anything during such harsh times. In this case, these efforts helped to raise spirits socially as well as to boost economic growth. Over 2.8 million dollars worth of food was produced from the subsistence gardens during the Depression. By the time of the Second World War, the War/Food Administration set up a National Victory Garden Program that set out to systematically establish functioning agriculture within cities. With this new plan in action, as many as 5.5 million Americans took part in the victory garden movement and over 9 million pou nds of fruit and vegetables were grown a year, accounting for 44% of U.S.-grown produce throughout that time.[citation needed] In 2010, New York City saw the building and opening of the worlds largest privately owned and operated rooftop farm, followed by an even larger location in 2012.[6] Both were a result of municipal programs such as The Green Roof Tax Abatement Program.[7] and Green Infrastructure Grant Program[8] With its past success in mind and with modern technology, urban agriculture today can be something to help both developed and developing nations. 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