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    PET Scans

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    different. Basically, a person is injected with a radioactive substance. This substance begins the process of radioactive decay inside of the person and interacts with the tissue to produce gamma radiation. These gamma rays are detected by scintillation crystals and transmitted to a computer, where images are produced. But how does this all take place? The description of PET scans in detail requires the understanding of the radioactive substance injected into the subject. First, a small amount of a biochemical

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    Analysis of the art of Pablo Palazuelo

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    Geologic form un-earthed: "Seeing through" the art of Pablo Palazuelo "Science and art are two 'di-fferent' ways of getting to know the world, ways which-from a shared origin-evolved separately. [...] The two 'di-fferent' conceptions as well as the corresponding attitudes and activities reveal their reciprocal 'in/cidence' (the result of their common origin) when they are studied in depth and 'without pre/judice.'" --Pablo Palazuelo, (Vision-Time essay, Reina Sofía, 259)

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    Physics of Skiing

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    and study in its natural environment. Snow changes properties and is difficult to measure and study in its natural environment. Ice Crystals form when water vapor condenses around and freezes upon a foreign particle such as dust or sea salt. These Ice crystals then form various varieties of snow flakes. Snowflakes can fall in many forms, including ferns, crystals and needles. These snow flakes begin transforming as soon as they hit the ground. They begin to morph in a combination of melting

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    Proces art

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    (Donald 852). This influenced the thinking of process, and the notion that sometime things falling apart are far more interesting than building it. As we see in Smithson's work Spiral Jetty (1970), which made a giant coil of earth, rock, and salt crystals extending outward from the shore of the Great Salt Lake in Utah. He left it vulnerable to the natural forces of rain, wind, and erosion. To him, time of his work is so important that is one of his most important mediums (Flam XIX). He also mentions

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    was obtained and placed in a 125 mL Erlenmeyer flask along with 25 mL of water and 2.5 mL of conc. Sodium bisulfate soln. The solution was then placed in an ice bath to precipitate and then the solid product was filter in a Buchner funnel. These crystals were then re-dissolved minimum amount of hot solvent (heptane) and recrystallized. Once a dry product was obtained, a melting point was established (2,4-Dibromoanisol mp 55-58 C) and percent yield was established (52%). Results: Through a melting

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    locations in the CCD, but the cause of this charge generation is basically the same in all locations. This is because all cases are to do with irregularities in the fundamental crystal structure of the silicon present in CCDs. Examples of these irregularities include metal impurities such as gold, copper or iron, and crystal defects such as dislocations and stacking faults, all of which are known to be thermal generation sites of charge carriers in silicon. THE BEST EXAMPLE OF WHERE THIS DARK Current

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    The Uses of Salt

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    are sodium and chlorine [chloride]. Its chemical name is sodium chloride (NaCl). “In chemistry, common salt is one of a large number of electrolytic compounds classified as salts. The compound occurs as a mineral in the form of crystals and the forms of the crystals are generally cubic and are transparent.” (Encyclopedia Americana 163) Halite (sodium chloride) comes from the Greek “halos”, meaning salt and “lithos” meaning rock, and is better known as “rock salt”. Salt is produced by the evaporation

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    Three Stages of Thunderstorm Formation The kind of thunderstorms that produce our summer rains are called ordinary thunderstorms, or air mass thunderstorms. They form when warm, humid air rises in an unstable atmosphere. Warm air cools down as it rises, and once it becomes colder than the air around it, it will begin to fall back down. In an unstable atmosphere, the temperature of the surrounding air decreases faster with height than the temperature of the rising warm air. This causes the warm

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    often pull people – and countries – in opposing directions. The former motivates the learning of an international language, with English as the first choice in most cases; the latter motivates the promotion of ethnic language and culture’ (David Crystal, 1997). Language planning policies in Singapore have often been characterised by the ‘desire to achieve a balance between the national pride of linguistic ownership and the need for international intelligibility’ (Khoo 1993: 67). This is evident

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    Classifying Rocks

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    sedimentary, and metamorphic rocks. Igneous rocks are classified first by texture. This is broken down mainly into grain size. First there are intrusive, or plutonic igneous rocks. These types of rocks cool within the crust and forms large, visible crystals. The opposite would be extrusive, or volcanic rocks. These cool at the surface rapidly, forming small grains. A combination of the two would be porphyritic, large grains in an aphanitic, or extrusive matrix. Secondly, composition is used to classify

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