The two junctions Essay Example for Free

The two junctions Essay A thermocouple is a pair of different metals, which produces a thermoelectric effect (e. m. f. ), which is used to sense and measure a difference in temperature. A thermocouple consists of two different metal wires joined together. When there is a temperature difference between the two junctions, a thermoelectric emf is produced. A thermocouple is a source of a temperature dependent emf that can be used to monitor or measure temperatures. When two different metals are connected together, electrons leave one metal and transfer to the other metal, causing a potential difference across the two junctions. This is known as the Seebeck effect. This potential difference occurs because electrons can leave one of the metals more easily than the other so the first metal looses the electrons to become positive and the second metal gains electrons to become negative. If both junctions are at the same temperature, it causes an equal but opposite potential difference at the other junction. If the junctions are at different temperatures, then the potential difference across them can differ, giving rise to a net emf around the circuit. This is what is called as the thermoelectric effect. The metals must be different and for a given temperature, the emf depends on the choice of the two metals. The potential difference is small, of the order of a few millivolts or less. However, the resistance of a thermocouple is generally small. So despite the small potential difference, it will give a measurable current. A problem with working with thermocouples is that it needs a sensitive voltmeter, able to detect a signal of the order of a thousandth of a volt. Too sensitive a detector, and there appears to be no temperature difference. Another problem is the problem of internal resistance of a source. If the thermocouple is connected to a low resistance detector, the potential difference across it may be tiny, because most of the potential difference available is used up in driving a small current through the large internal resistance. Only if the detector has itself a very high resistance is there an appreciable potential difference seen as the output of the sensor. A thermocouple thermometer can be made using two similar wires and a different wire connected together to form two junctions acting in opposition to each other. The free end of each similar wire is connected to a microvoltmeter or to a d.c. Amplifier with a voltmeter connected at its output. One of the junctions is maintained at a constant temperature and the other junction is used as a temperature prob. The meter reading changes according to the difference between the temperature of the probe and the reference junction. The probe is simply a junction between two thin wires and this makes it respond rapidly to change of temperature and has therefore a faster response time in liquid glass thermometer. In addition, because a thermocouple generates an emf directly, it is used widely in control systems.

Significance Of Ritual In North American Indian Religion Essay

Significance of Ritual in North American Indian Religion When scholars study religion, the tendency exists to focus on the mythological aspects of the religion in an attempt to understand the major underlying concepts present. However, an equally rewarding study often can be accomplished through the careful analysis of the religion's ritual aspects. This is especially true when studying North American Indian religions where there is an abundance of elaborate rituals that play a significant role in their culture. By closely examining the details and symbolism of ritual movements, we can gather some basic understanding of what is seen to be of value in a certain theology. While most Native American rituals tend to be mono-cultural, there are a few rituals that frequently appear in many different regions and tribes across North America. Two of these widespread rituals are the ritual of the "sacred pipe," and sweat lodge ceremonials. The sacred pipe ritual is loaded with symbolic meaning, and offers a generous insight into Native American belief systems. This essay will first look at the dynamics of the sacred pipe ritual and offer some explanation into its religious significance, then draw some parallels to the more common sweat lodge ceremony. If a recurring spiritual theme appears in separate rituals, it can be considered evidence of a consistent, structured belief system. The use of smoking pipes in Native American cultures is a popular and very ancient practice. Direct predecessors of the modern pipe appear 1,500 years ago, and other less relevant pipes can be found as far back as 2,500 years ago. The distinguishing characteristic of the sacred pipe is that the bowl is separable from the long stem, and the two parts are kept apart except during ritual use. The pipe is seen as a holy object and is treated with much respect. This type of ceremonial pipe was used by tribes ranging from the Rocky Mountain range to the Atlantic, and from the Gulf of Mexico to James Bay. It did not penetrate into Pacific coast or Southwest cultures, where tubular pipes were preferred. Inter-tribal trading helped the practice of this particular ritual spread rapidly, because in order for peaceful trade relations to take place some form of ritual had to be observed. Resp... ...placed on directions, especially east and west which is obviously derived from the path of the sun. Also important are the upward and downward directions representing the male sky and the female earth, and the joining of the two to give life. The simple fact that these symbols are so widespread and evident in separate rituals suggests that the North American Indians had a strong religious foundation long before Europeans arrived and attempted to ‘teach' them religion. WORKS CITED LIST Brown, Joseph Van Epes. The Sacred Pipe: Black Elk's Account of the Seven Rites of the Oglala Sioux. Norman, Oklahoma: University of Oklahoma Press, 1953. Coorigan, Samuel W, ed. Readings in Aboriginal Studies Brandon, Manitoba: Bearpaw Publishing, 1995. Hultkrantz, Ake. Belief and Worship in Native North America. Ed. Christopher Vecsey. Syracuse, New York: Syracuse University Press, 1981. Robicsek, Francis. The Smoking Gods: Tobacco in Maya Art, History, and Religion. Norman, Oklahoma: University of Oklahoma Press, 1978. Steinmetz, Fr. Paul B., S.J. "The Sacred Pipe in American Indian Religions." American Indian Culture and Research Journal. 8(3): 27-80, 1984.

Developments In Cold Environments Sustainable Essay

To what extent are more recent developments in cold environments sustainable ? Fishing can disrupt food chains. For example krill fishing in the southern ocean is depleting food supplies for whales and penguins. Overfishing of a species can severely deplete its population, sometimes beyond recovery. Overfishing of the patagonian toothfish in the Antarctic is currently a concern. Bottom trawling catches fish by dragging nets along the sea-bed. This disrupts the eco system by reducing light levels thought increasing turbidity and catches other species as well as the target one. Its carried out in the gull of Alaska, the greenland sea and the barents sea. Fishing quotes have been introduced to limit the number of fish caught and prevent overexploitation of the resource. Large cruise ships increase pollution in the areas from the ships and from the tourist. Tourists and tourism developments disrupt wildlife and damage habitats leading to reduced biodiversity. National parks have been set up to allow tourism whilst protecting the environment e.g. denali national park in Alaska was set up in 1917 and then expanded in 1980 to induce a greater area of land. Cars and private vehicles are banned from the park so visitor’s have to travel in park buses on approved routes. The most vulnerable parts of the park don’t have any roads at all. So the ground is protected from the damaging effects of vehicles. Oil spills can occur during transport of oil from the area. For example in 1989 there was a huge oil spill off the coast of Alaska when the exxon valdez oil tanker crashed. Over 40 million litres of oil spilled into the ocean and over 250 000 birds and fish were killed. Oil spills can occur if the pipelines leak between 1977 and 1994 there were on average 30 to 40 spills a year from the trans-alaska pipeline. Some of these were caused by intentional attacks and forest fires. Oil pipes have automatic shut off valves in order to minimis e oil spills if the pipelines are damaged.

Essay On Salsa - 1201 Words

Salsa It originated from the blending and unity of the Cuban music to that of Puerto Rico and the combination of the jazz culture of New York City. Salsa means ‘sauce, meaning that the name was derived from a strongly flavored sauce. The name was appropriate since salsa music is a ‘sauce’ because of the mixture of other styles of Cuban music with a Puerto Rican influence Salsa dance was born after the slaves were given freedom to dance to their rhythms on the streets. Those people who performed these dances were known as ‘sonterios. The music had a complex rhythm well-known as ‘Toques’ from the drums. Salsa is not old. It is reasonably new but its musical roots date back to centuries. It was not known to people until 40 years ago when†¦show more content†¦The mixture leads to a widespread racial syncretism that in turn leads to a racial discrimination among people. Several terms were used for discriminatory purposes for example ‘mullatoà ¢â‚¬â„¢ meaning a small mull, ‘creole’ which meant that a person was raised by the master of the house, and ‘morisco’ which meant a person whose ancestry is one-quarter black. Many of these terms can be offensive to the modern sensibilities. The terms have derogatory implications that offer allude to cultural or even biological inferiority. The enlightened modern society acknowledges the socio-historical constructions of races and no longer embrace these distinctions but rather consider ethnicity regarding historical, social, economic, political, and the cultural characteristics. The calypso music that comes from a Trinidad musician is exciting, not on the ground of the blood that he carries in his veins but rather the historical, cultural, and religious favors that are brought together to ensure its production. The Emergence of African Culture The world wars had hit the Europeans so hard that they seriously and urgently needed a source of labor that would help in the rebuilding of their cities and mine their minerals such as coal, gold, and silver among others. They decide to turn to Africa for this labor and therefore, slave trade was born in the middle of the 15th century on the continent. The first batch of slaves was imported to Cuba. TheShow MoreRelatedSalsa Essay901 Words   |  4 Pagesinto Salsa music. For example, Willie Colon introduced the Cuatro from Puerto Rico which is a stringed instrument to add flavor to this music. Songs backed with Jazz, Rock tunes from Brazil and Panama. Celia Cruz one the most celebrated icon of Salsa was able to incorporate an electric piano making Salsa move with the changing times. Jazz elements were also added to Salsa music by Eddie Palmieri. He brought in Manny a renowned percussionist. 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