Nuclear generators Term Paper Example | Topics and Well Written Essays - 750 words

Nuclear generators - Term Paper Example The steam is then used to power the turbines that generate power. In nuclear generators, the fuel comes from nuclear fission, which is essentially the breakdown of the nucleus of a heavy atom into two smaller and lighter nuclei. The primary fuel in nuclear generators is uranium, either enriched, in its natural state, or in combination with plutonium. ... This is true for so-called reactors that are based on light-water designs, and the table below details the different types of decay, emitted radiation, and the associated charge, mass and energy (National Academy of Sciences): Table Source: National Academy of Sciences Decay Process Radiation Emitted Mass (amu) Electrical Charge Typical Energy (MeV) Alpha Emission Alpha particle (?) 4 +2 4–9 Beta Emission Beta particle () 0.0005 ?1 0–3 Positron Emission Positron (?+) 0.0005 +1 0–3 Â   Two gamma-rays (?) 0 0 0.51 Electron Capture Characteristic x-ray 0 0 0–0.1 Internal Transition Gamma-ray (?) 0 0 0.1–3 Internal Conversion Converted electron (e?) 0.0005 ?1 0.1–1 Â   Characteristic x-ray 0 0 0.0–1 Neutron Emission Neutron (n) 1 0 0–14 Spontaneous Fission (e.g., Cf-252) Fission products and other radiations — — ?200 Table Source: National Academy of Sciences As earlier discussed, power is generated in nuclear power generators/reactors largely through fission, and largely through the use of two types of radioactive fuels, namely uranium and plutonium, either alone or in combination. The plot below provides what are called yield curves for two fuel types, uranium-235 and plutonium 239, as a function of the mass number (National Academy of Sciences; World Nuclear Association; Lawrence Berkeley National Laboratory): Graph Source: National Academy of Sciences/CPSMA Fission yields are related to the amount of the element that is generated for every fission reaction that occurs. The yield curve that is generated is basically the same for every kind of known fission reaction, and so the plot above is universalizable and replicable,

Research paper on mapreduce Example | Topics and Well Written Essays - 750 words

On mapreduce - Research Paper Example Reduce collects relevant parts from the locations where the map function occurred and return the result to HDFS. IBM defines MapReduce based on its association with Hadoop (IBM 1). The company affirms that MapReduce denotes two distinct roles performed by Hadoop programs. The initial role pertains to map job. It engages data and changes it into another set by breaking down individual aspects into value pairs (IBM 1). Reduce job engages the output generated by a map and engages it to produces smaller value pairs. Based on IBM definition, it is clear that MapReduce is a popular programming technology that allows the use of many computers in order to process huge amount of data. It helps in coordinating tasks in order to avoid issues such as input problems and harmonization delays. One can perform various tasks such as data mining and graph processing using this concept. The concept is popular in industries and conducting complex researches. An example of commonly use MapReduce implementations is Hadoop. Vianna, Almeida & Kuno (1) further define Map Reduce based on its sorting process. The authors indicate that when one has many sets of records and he needs to sort or process them in a specific order, he may use MapReduce. MapReduce is an invention that allows an individual to use Mappers that have sorting keys that dive the data set based on the values associated with them. Vianna, Almeida & Kuno (1) further define MapReduce as a process involving the combination all the sorted data. This concept is usually applied in data analysis. The authors provide an example of MapReduce as used in data filtering. They indicate that when one has sets of records that require arrangements to ensure they meet a certain condition, he can filter them using MapReduce. For instance, one can filter the records using Mappers which produce transformed versions of the