0708_nuclear_energy.ppt
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Nuclear fission involves splitting large atomic nuclei into smaller nuclei, producing a chain reaction that can be controlled for energy production or uncontrolled for atomic bombs. Nuclear fusion combines low mass nuclei into larger nuclei and occurs at very high temperatures in stars, but is difficult to achieve on Earth. The products of both fission and fusion reactions are radioactive, though fission produces more harmful waste that must be treated or stored.
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Nuclear energy
A power point presentation on nuclear energy and how it is used to produce electricity with wonderful sound effects, animations and videos.
0708 nuclear energy
Nuclear energy is emitted from radioactive elements during nuclear fission or fusion reactions. Nuclear fission involves splitting heavy radioactive nuclei, while nuclear fusion combines lighter nuclei. Fission is used in nuclear power plants to generate electricity through controlled chain reactions, using elements like uranium. Fusion occurs in stars and requires extremely high temperatures. While nuclear energy produces less waste than fossil fuels, the byproducts are radioactive and require careful treatment or storage due to their harmfulness.
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There are several types of power plants including steam, hydroelectric, nuclear, gas turbine, and diesel. Nuclear power plants generate electricity through nuclear fission using uranium-235 as fuel. The nucleus of U-235 splits when bombarded by neutrons, releasing energy and more neutrons to sustain a chain reaction. Key components of a nuclear power plant are the nuclear fuel rods, neutron source, reactor, control rods, and moderator. Nuclear power provides advantages of using less fuel and space compared to other options, but also has higher costs and produces hazardous waste. Major nuclear power plants are located in India at various sites.
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The document discusses nuclear fission and fusion, as well as nuclear power generation. It defines nuclear fission as the splitting of heavy isotopes by neutrons, which releases energy and more neutrons in a chain reaction. Nuclear fusion is defined as the joining of light isotopes at high temperatures, as occurs in stars. The document then discusses the key components of a nuclear reactor, including the reactor vessel, fuel rods, control rods, and containment structure. It explains how nuclear fission is used in reactors to heat water and produce steam to drive turbines that generate electricity.
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Fission is the splitting of a nucleus into smaller parts that releases energy. It can occur through nuclear chain reactions where neutrons produced in one fission induce additional fissions. Uranium-235 is commonly used as it can undergo fission when struck by slow neutrons. This results in fission products like krypton and strontium, more neutrons on average, and a large amount of energy. A controlled chain reaction in a nuclear reactor uses fissionable material as fuel, neutron moderators to slow neutrons, control rods to regulate the reaction, coolants to remove heat, and shielding to protect from radiation. Nuclear power plants generate electricity by using the heat from fission in a reactor to
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Nuclear fission occurs when the nuclei of certain isotopes split into smaller fragments upon bombardment with neutrons, producing a chain reaction that releases enormous amounts of energy. Controlled nuclear fission in reactors uses uranium or plutonium fuel rods to produce heat that is used to generate electricity, while spent fuel rods become nuclear waste. Nuclear fusion differs in that it involves the combining rather than splitting of small nuclei like hydrogen to form larger nuclei like helium, potentially releasing even more energy, but technical challenges remain in achieving and containing the necessary high temperatures.
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The document discusses nuclear power plants and nuclear reactions. It begins by explaining the basics of nuclear fission and fusion reactions, including mass defect and binding energy. It then describes some key components of nuclear power plants, such as the reactor, moderator, coolant, and steam turbine system. The document discusses controlled nuclear fission, chain reactions, and classifications of nuclear reactors based on criteria like neutron energy, fuel used, moderator, and coolant. It also provides examples of fissile and fertile nuclear materials.
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Nuclear energy
A power point presentation on nuclear energy and how it is used to produce electricity with wonderful sound effects, animations and videos.
0708 nuclear energy
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The document discusses nuclear fission and fusion, as well as nuclear power generation. It defines nuclear fission as the splitting of heavy isotopes by neutrons, which releases energy and more neutrons in a chain reaction. Nuclear fusion is defined as the joining of light isotopes at high temperatures, as occurs in stars. The document then discusses the key components of a nuclear reactor, including the reactor vessel, fuel rods, control rods, and containment structure. It explains how nuclear fission is used in reactors to heat water and produce steam to drive turbines that generate electricity.
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Fission is the splitting of a nucleus into smaller parts that releases energy. It can occur through nuclear chain reactions where neutrons produced in one fission induce additional fissions. Uranium-235 is commonly used as it can undergo fission when struck by slow neutrons. This results in fission products like krypton and strontium, more neutrons on average, and a large amount of energy. A controlled chain reaction in a nuclear reactor uses fissionable material as fuel, neutron moderators to slow neutrons, control rods to regulate the reaction, coolants to remove heat, and shielding to protect from radiation. Nuclear power plants generate electricity by using the heat from fission in a reactor to
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Nuclear fission occurs when the nuclei of certain isotopes split into smaller fragments upon bombardment with neutrons, producing a chain reaction that releases enormous amounts of energy. Controlled nuclear fission in reactors uses uranium or plutonium fuel rods to produce heat that is used to generate electricity, while spent fuel rods become nuclear waste. Nuclear fusion differs in that it involves the combining rather than splitting of small nuclei like hydrogen to form larger nuclei like helium, potentially releasing even more energy, but technical challenges remain in achieving and containing the necessary high temperatures.
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8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters
represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions
among stars.
Aims. In this paper we present the Extended Westerlund 1 and 2 Open Clusters Survey (EWOCS) project, which aims to investigate
the influence of the starburst environment on the formation of stars and planets, and on the evolution of both low and high mass stars.
The primary targets of this project are Westerlund 1 and 2, the closest supermassive star clusters to the Sun.
Methods. The project is based primarily on recent observations conducted with the Chandra and JWST observatories. Specifically,
the Chandra survey of Westerlund 1 consists of 36 new ACIS-I observations, nearly co-pointed, for a total exposure time of 1 Msec.
Additionally, we included 8 archival Chandra/ACIS-S observations. This paper presents the resulting catalog of X-ray sources within
and around Westerlund 1. Sources were detected by combining various existing methods, and photon extraction and source validation
were carried out using the ACIS-Extract software.
Results. The EWOCS X-ray catalog comprises 5963 validated sources out of the 9420 initially provided to ACIS-Extract, reaching a
photon flux threshold of approximately 2 × 10−8 photons cm−2
s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
with 1075 sources located within the central 1 arcmin. We have successfully detected X-ray emissions from 126 out of the 166 known
massive stars of the cluster, and we have collected over 71 000 photons from the magnetar CXO J164710.20-455217.
Bob Reedy - Nitrate in Texas Groundwater.pdf
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ESR spectroscopy in liquid food and beverages.pptx
With increasing population, people need to rely on packaged food stuffs. Packaging of food materials requires the preservation of food. There are various methods for the treatment of food to preserve them and irradiation treatment of food is one of them. It is the most common and the most harmless method for the food preservation as it does not alter the necessary micronutrients of food materials. Although irradiated food doesn’t cause any harm to the human health but still the quality assessment of food is required to provide consumers with necessary information about the food. ESR spectroscopy is the most sophisticated way to investigate the quality of the food and the free radicals induced during the processing of the food. ESR spin trapping technique is useful for the detection of highly unstable radicals in the food. The antioxidant capability of liquid food and beverages in mainly performed by spin trapping technique.
Pests of Storage_Identification_Dr.UPR.pdf
InIndia-post-harvestlosses-unscientificstorage,insects,rodents,micro-organismsetc.,accountforabout10percentoftotalfoodgrains
Graininfestation
Directdamage
Indirectly
•theexuviae,skin,deadinsects
•theirexcretawhichmakefoodunfitforhumanconsumption
About600speciesofinsectshavebeenassociatedwithstoredgrainproducts
100speciesofinsectpestsofstoredproductscauseeconomiclosses
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0708_nuclear_energy.ppt
- 2. Nuclear Fission • Nuclear fission is the process of splitting a nucleus into two nuclei with smaller masses. • Fission means “to divide” • Remember that fission has 2 s’s, therefore it splits into TWO parts.
- 3. Fission cont. • Only large nuclei with atomic numbers above 90 can undergo fission. • Products of fission reaction usually include two or three individual neutrons, the total mass of the product is somewhat less than the mass of Uranium- 235.
- 4. Chain Reaction • A chain reaction is an ongoing series of fission reactions. Billions of reactions occur each second in a chain reaction.
- 5. Chain Reaction cont. • On earth, nuclear fission reactions take place in nuclear reactors, which use controlled chain reactions to generate electricity.
- 6. Chain Reaction cont. • Uncontrolled chain reactions take place during the explosion of an atomic bomb.
- 7. Fission Products • The products of nuclear fission reactions are radioactive, but the energy released from these reactions is less harmful to the environment than the use of fossil fuels. • The products are intensely radioactive and must be treated and/or stored.
- 8. Nuclear Fusion • Nuclear fusion is the combining of two nuclei with low masses to form one nucleus of larger mass. • Nuclear fusion reactions are also called thermonuclear reactions.
- 9. Nuclear Fusion cont. • Fusion reactions exist in stars. • Our sun is a good example of a thermonuclear (fusion) reaction. • It is almost impossible to create fusion reactions on earth since they need temperatures above one million degrees Celsius in order to take place.
- 10. Nuclear Fusion cont. • Nuclear fusion produces less nuclear waste than nuclear fission and the materials are easier to obtain.