Neutrinos And Gamma Rays Essays - Neutrinos, Dark Matter

Neutrinos And Gamma Rays Essays - Neutrinos, Dark Matter Neutrinos and Gamma Rays Emission of a beta particle produces an energy change in the nucleus of an atom. The energy change that is observed, however, does not add up to satisfy the Law of Conservation of energy. The conservation law can be balanced if another particle, called the neutrino is part of this process. In the time it takes to read just this sentence, more than a billion of them will have passed unnoticed through the reader's body. Neutrinos may account for an appreciable portion of the mass of the universe, even tending to slow it's rate of expansion. Originally proposed in 1931 by Wolfgang Pauli to account for mass that was mysteriously lost from certain nuclear reactions,and first observed in 1956 by Dr Frederick Reines and Dr. Clyde Cowan, neurtinos either were beleived to have no mass or to have a negligible amount of mass. Ever since their discovery scientists wondered if this elusive particle that has no electric charge and is able to pass through the entire earth without hitting anything might not have some negligible amount of mass. Because they exist in great numbers in the universe, even a small mass could provide the "dark matter" that cosmologists beleive makes up the substance of the cosmos. Having a mass, neutrinos might also be able to change into neutrinos of other types, by a process called oscillation. They have no electrical charge and are believed to travel at or near the speed of light. Neutrinos react very little with matter and only rarely do they react with protons or neutrons through a force ! called "the weak force". Their discovery enabled scientists to work out a conservation of evergy, spin, and momentum for beta decay. There are six types of neutrinos, depending upon the subatomic particles with which they are associated: electon antineutrinos with electrons, electron neutrinos with positrons, muon neutrinos and antimeutrinos with muon reactions, and tau neutrinos and antineutrinos with massive tau particles. Mass is what determines the rate at which the wave function of a particle vibrates. If the waves of two neutrinos of different masses mingle, they beat against each other much like sound waves of different pitch . If neutrinos had no mass, their waves would have the same frequency and would not be able to beat at all. A particle detector at Los Alamos National Laboratory has captured eight events that could be the first direct sightings of neutrino oscillations. If verified, the observations will prove as well that neutrinos have mass. However such experiments are not easy to carry out. In the Liquid Scintillator Neutrino Detector experiment, a beam of protons from an accelerator is shot into a water target. Particles are absorbed and detected and some implications involving neutrino mass are made, and although this could help solve the dark matter problem it contributes nothing to the major puzzle the scientists are concerned with: the solar neutrino problem. Only about half the number of neutrinos that the theory predicts should come from the sun are actually detected. The deficit might be explained by presuming that the particles change to muon neutrinos and therefore escape detection. But if neutrinos change type over short distances as in the LSND experiment, the oscillations ! would average out over the 92 million miles that seperates the sun from the earth. Some other neutrino experiment have been undertaken to determine the number of neutrinos that actually reach the earth from the Sun and stars. One such experiment known as DUMAND, for Deep Underwater Muon and Neutrino Detector, Which was led by scientists from the Univ. of Hawaii, sought to install detectors in deep water off the coast of Hawaii's Big Island. But leaks and broken connections caused one expensive problem after another, and money for the project by the Department of Energy was recently ended. And just in November 1996 a collaboration of Greek and US physicists began their experiment called NESTOR (Neutrinos fom Supernova and Tervolt sources, Ocean Ridge). They began by lowering instument-laden platforms resembling umbrellas into the deepest part of the Mediterranean Sea off the southwest coast of Greece to test a system that will look for neutrinos coming up from the ocean floor. The earth is used

Compare and contrast societies of medieval China, Arabic Caliphate, Essay

Compare and contrast societies of medieval China, Arabic Caliphate, and Christendom (Western Europe) - Essay Example The discussion of class structure shall encompass status symbols and interactions between members of different social classes. Utilizing such literature as â€Å"Po Hsing-chien,† â€Å"Su Shih,† â€Å"Ssu-ma Kwang,† â€Å"Marco Polo,† â€Å"The Hunchback† and â€Å"The Man who Never Laughed Again† from 1001 Nights, the Qu’ran, â€Å"Al-Farabi,† the Black Death reading, Matthew, Acts, Romans, The Life of Charlemagne, Chaucer’s Prologue to The Canterbury Tales, and the Magna Carta, conclusions can be drawn that will aid in the comparison of these three societies.. First to be compared among the previously stated societies is religion. One determining factor of any religion is the belief in the metaphysical or supernatural, such as a God or Gods. In medieval China, common was the belief in a multitude of spirits with different powers. For example, Miss Li and her lover in Po Hsing-Chieng visited the spirit of the Bamboo Grove in order to receive assistance in conceiving a child. (Po Hsing-Chieng, 303). Arabic Caliphate embraces a belief in one God, known as Allah. (Qu’ran). According to the Biblical book of Acts, Christendom encompassed a belief in a holy trinity, which included the Holy Spirit, God the Father and God the Son. (Acts, 2). Both Arabic Caliphate and Christendom were considered monotheistic religions, meaning they believed in one God, while medieval China seemed to embrace a belief in many spirits. It is also practical to examine each society’s members’ relationships to their God(s). Evidence from literature provides that people in medieval China thought they were consistently being watched and judged by the gods in terms of honor and morale. In â€Å"Po Hsing-Chien,† Miss Li tells her mother that they need to help the young man because the spirits would not be on their side for the bad things they had already done to him. (Po Hsing-Chien, 305). In Arabic Caliphate trust was placed in the will of

Literature review of Energy savings companies (ESCO) and marketing Essay

Literature review of Energy savings companies (ESCO) and marketing - Essay Example A true win-win-win if successfully implemented. As far as marketing is concerned it is a social and managerial process by which individuals and groups obtain what they need and want through creating and exchanging products and values with others. It is an integrated process through which companies create value for customers and build strong relationships with them in order to capture value from customers in return. Thus for effective functioning of ESCO it has implemented various tools and strategies of marketing. According to European Union energy services, energy services are those activities which are taken up by the companies and market actors, and which result in demonstrable and sustainable savings of supplied/delivered energy in the customer's household and which includes the option of initial investment by other than the household or property owner [1]. The energy service company (ESCO) is in the business of providing broad range of comprehensive energy solutions including the designing and implementation of energy saving projects, energy conservation, energy infrastructure outsourcing, power generation, energy supply and risk management. Sixteen companies have been grouped together in the industry structure that provides projects based on ESCO structure [2, 3, and 4]. Ameresco is the only pure-play ESCO left in the market [5]. The others are Carrier, Honeywell Building Solutions SES, Johnson Controls Government Systems, L.L.C., Siemens Government Services, Inc., TAC Americas, Inc., Trane U.S., Inc., ConEdison, Constellation, FPL Energy Services, Pepco Energy Services, The Benham Companies, LLC (SAIC Acquired), Clark Realty Builders, LLC, McKinstry, Lockheed Martin and Chevron Energy [6, 7 ,8]. The ESCO customers include [9] Working of ESCO ESCO has its own way of working it starts with analyzing the part, then designs the energy efficient solution and installs the required elements, finally maintaining the system to ensure that the energy is saved during the payback period. The savings in energy costs is often used to pay back the capital investment of the project over a five- to twenty-year period, or reinvested into the building to allow for capital raise that may otherwise be impractical. If the project does not provide returns on the investment, then ESCO is often responsible to pay the difference [10]. ESCOs structure is as follows Contract Services Customer ESCO PaymentFinancing payment Contract Bank (ESCO feasibility report. 2007) Initially ESCO installs the energy conservation measures (ECM's) and measure the energy saved resulting from the projects and presents the data to the customer. A common way to calculate energy savings is to measure the flows of energy associated with the ECM, and to apply spreadsheet calculations to determine savings. They have formed a standardized table as follows; Description Typical