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Search results 211 - 220 of 1458 matching essays
- 211: Geothermal Energy
- ... or steam has been used in many different systems from heating houses and baths to being a source of boric acids and salts. Today geothermal fluids provide energy for electricity production and mechanical work. Boric acid is still extracted and sold. Other byproducts of geothermal heated liquid are carbon dioxide, potassium salts, and silica. The first 250 kilowatt geothermal power plant began operation in 1913 in Italy. By 1923 the United ... pressure builds. This problem can be solved by using simple filters that are periodically changed in the pipes. Corrosion occurs because of acidic substances incorporated in the geothermal fluid. Usually geothermal fluid contains some boric acid. Using pipes that are not affected by these liquid generally takes care of corrosion. Unfortunately most metals that are non-corrosive are very expensive. Most types of wildlife can not live in or consume saline ... proved not to be the case, after a while the pipes began to corrode. As steam condenses non-condensable gases become more of a problem. They become more concentrated, more corrosive and can form sulfuric acid. This new problem was solved by replacing the carbon steel used in the original construction with austenitic stainless steel. Electrical connections and wires were also effected by concentrations of sulfuric acid. They were replaced ...
- 212: Poetry 3
- ... nature. She has no material goods to show for her hard work, but she has peace in the fact that the world around her is all that is hers. She says, Shine on me, sunshine, rain on me, rain, fall softly, dewdrops, and cool my brow again. The rain and the dewdrops symbolize tears falling on her in her final resting-place. She then says, Storm, blow me from here with your fiercest wind. Let me float across the sky, till I can ...
- 213: Endangered Species Study: Jaguars
- ... America have been being killed for game and protection. This cat used to have homes around the United States to Uruguay, but ever since the fears of extinction the jaguars have moved to the undeveloped rain forests in Latin America. Jaguars are being killed due to many people fearing for their own lives and many are also being killed to protect cattle. Jaguars do stalk and ambush their prey, however, they rarely ever attack man. One of the main reasons that jaguars are still living is that they can adapt to many habitats, from tropical rain forests and swampy areas to scrub lands and grasslands. II. Jaguars are part of the life cycle of many species. Killing jaguars for protection and furs are ruining other species that live in the same ... jaguars have had a part in were to protect themselves from being killed. Many jaguars just disappear from the pressures of being killed. While the animal is trying to change habitats they have died. The rain forests that the jaguars inhabit are being torn down to open up lumbering, farming, livestock raising, and other activities carried out by humans. Killing a jaguar is taking away a life that is doing ...
- 214: Fluoride
- ... reversing the early signs of tooth decay. Researchers have shown that there are several ways through which fluoride achieves its decay-preventive effects. It makes the tooth structure stronger, so teeth are more resistant to acid attacks. Acid is formed when the bacteria in plaque break down sugars and carbohydrates from the diet. Repeated acid attacks break down the tooth, which causes cavities. Fluoride also acts to repair areas in which acid attacks have already begun. The remineralization effect of fluoride is important because it reverses the early decay ...
- 215: Poetry
- ... nature. She has no material goods to show for her hard work, but she has peace in the fact that the world around her is all that is hers. She says, Shine on me, sunshine, rain on me, rain, fall softly, dewdrops, and cool my brow again. The rain and the dewdrops symbolize tears falling on her in her final resting-place. She then says, Storm, blow me from here with your fiercest wind. Let me float across the sky, till I can ...
- 216: The Role Catalysts In Chemical Reactions, Their Importance In Industry, Problems and New Developments
- ... with the help of catalysts every year. It is therefore logical that scientists are constantly searching for new improved catalysts which will improve efficiency or produce a greater yield. An acidic catalyst works due its acid nature. Catalysts are strong acids and readily give up hydrogen ions, or protons: H+. Protons can be released from hydrated ions, for example H3O+, but more commonly they are released from ionisable hydroxyl groups (R-OH) where the O-H bond is broken to produce R-O- and H+. When the reactant receives protons from an acid it undergoes a conformational change, (change in shape and configuration), and becomes a reactive intermediate. The intermediate can then either become an isomer by returning a proton to the catalyst, or it may undergo a ... used this promoted great problems in terms of disposal as these acids corrode disposal containers and are highly dangerous to transport and handle. These problems have been solved by a new type of catalyst. Solid acid catalysts, such as silica-alumina gels and zeolites, hold their acidity internally and are therefore much safer to work with and to dispose of. More recently, pressure from environmentalists has led to a search ...
- 217: Geothermal Energy
- ... or steam has been used in many different systems from heating houses and baths to being a source of boric acids and salts. Today geothermal fluids provide energy for electricity production and mechanical work. Boric acid is still extracted and sold. Other byproducts of geothermal heated liquid are carbon dioxide, potassium salts, and silica. The first 250 kilowatt geothermal power plant began operation in 1913 in Italy. By 1923 the United ... pressure builds. This problem can be solved by using simple filters that are periodically changed in the pipes. Corrosion occurs because of acidic substances incorporated in the geothermal fluid. Usually geothermal fluid contains some boric acid. Using pipes that are not affected by these liquid generally takes care of corrosion. Unfortunately most metals that are non- corrosive are very expensive. Most types of wildlife can not live in or consume saline ... proved not to be the case, after a while the pipes began to corrode. As steam condenses non-condensable gases become more of a problem. They become more concentrated, more corrosive and can form sulfuric acid. This new problem was solved by replacing the carbon steel used in the original construction with austenitic stainless steel. Electrical connections and wires were also effected by concentrations of sulfuric acid. They were replaced ...
- 218: DNA
- DNA Deoxyribonucleic acid and ribonucleic acid are two chemical substances involved in transmitting genetic information from parent to offspring. It was known early into the 20th century that chromosomes, the genetic material of cells, contained DNA. In 1944, Oswald T. Avery ... This specifies the sequence of amino acids in a protein. (Grolier Encyclopedia, 1992) DNA does not act directly in the process of protein synthesis because it does not leave the nucleus, so a special ribonucleic acid is used as a messenger (mRNA). The mRNA carries the genetic information from the DNA in the nucleus out to the ribosomes in the cytoplasm during transcription. (Miller, 76) This leads to the topic ...
- 219: Radioactive Wastes
- ... pellets coated with ferrous oxide and maintained at a temperature of 500 C. In the treatment of liquid wastes, the condensates collected contain about 15% ruthenium. This is then concentrated in an evaporator where nitric acid is destroyed by formaldehyde so as to maintain low acidity. The concentration is then neutralized and enters the vitrification pot. Once the vitrification process is finished, the containers are stored in a storage pit. This ... the best for all receiving formations. With such a pH range, breakdown of the formation rock and dissociation of the formation water are avoided. The stability of waste containing metal cations which become hydrolysed in acid can be guaranteed only by complexing agents which form 'water-soluble complexes' with cations in the relevant pH range. The importance of complexing in the preparation of wastes increases because raising of the waste solution ... the bonds between isotopes and formation rock. Now preparation of the formation is as equally important. To reduce the possibility of chemical interaction between the waste and the formation, the waste is first flushed with acid solutions. This operation removes the principal minerals likely to become involved in exchange reactions and the soluble rock particles, thereby creating a porous zone capable of accommodating the waste. In this case the required ...
- 220: Microbursts
- ... shear presents a hazard to aircraft has been well documented in the last ten years. Since some wind shear can occur in otherwise relatively good weather, the most hazardous kind, a microburst, is associated with rain showers and thunderstorms even thought the parent storm may not be discernible. It was not until the early 1970's that the National Transportation Safety Board was able to obtain the level of data form ... process that produce the more common and less intense down drafts; that is, by precipitation drag and cooling due to the evaporation and melting of precipitation particles. In a microburst, the downdraft intensifies with heavy rain and when dry air is mixed into the downdraft causing evaporative cooling and great negative buoyancy. A Microburst may occur in airmass, multicell, and supercell thunderstorms. Isolated, single cell storms present a greater hazard to ... it spreads out laterally as a vortex ring which rolls upward along its outer boundary. You could interpret this pattern as a upside down thermal. Not all microbursts are alike; some are accompanied by heavy rain (wet) while others form beneath small verga (dry). Virga is defined as rain showers where the precipitation does not reach the ground. Both types produce extremely dangerous shears which can occur with little or ...
Search results 211 - 220 of 1458 matching essays
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