The Experts below are selected from a list of 34323 Experts worldwide ranked by ideXlab platform
L J Qiu - One of the best experts on this subject based on the ideXlab platform.
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Divertor modeling and design for a Low-Aspect-Ratio tokamak transmutation reactor
Fusion Engineering and Design, 2000Co-Authors: Y P Chen, Li Lin, Xiaoping Liu, L J QiuAbstract:The Low Aspect Ratio tokamak has a wider scrape-off-layer, modeling of the SOL plasma in a Low-Aspect-Ratio tokamak transmutation reactor is done in order to construct a database for the design of natural divertor in the reactor. B2 code is applied to modeling. Modeling results show that the wider SOL in Low-A tokamak can reduce plasma temperature, density and energy flux on the target plate of natural divertor compared with thin SOL in convention tokamak, radiation gas puffed into room of the divertor can reduce energy flux on the target plate to very Low level. Based on modeling and relative design experience of divertor, a new structure design of the natural divertor is proposed. The natural divertor consists of 16 modules, each module mainly includes cassette body, vertical target plate, energy dump target plate, wing and liner, dome, cooling tubes and so on, cold He gas puffing is applied to the design. Some key parameters for the design have been obtained.
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a Low Aspect Ratio tokamak transmutation system
Nuclear Fusion, 2000Co-Authors: L J Qiu, Bingjia Xiao, Qing Huang, Y X Chen, Y P Chen, Xiaoju LiuAbstract:A Low Aspect Ratio tokamak transmutation system is proposed as an alternative application of fusion energy on the basis of a review of previous studies. This system includes: (1) a Low Aspect Ratio tokamak as fusion neutron driver, (2) a radioactivity-clean nuclear power system as blanket, and (3) a novel concept of liquid metal centre conductor post as part of the toroidal field coils. In the conceptual design, a driver of 100 MW fusion power under 1 MW/m2 neutron wall loading can transmute the amount of high level waste (including minor actinides and fission products) produced by ten standard pressurized water reactors of 1 GW electrical power output. Meanwhile, the system can produce tritium on a self-sustaining basis and an output of about 2 GW of electrical energy. After 30 years of opeRation, the biological hazard potential level of the whole system will decrease by two orders of magnitude.
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A Low Aspect Ratio tokamak transmutation reactor
Fusion Engineering and Design, 1998Co-Authors: L J Qiu, Y P Chen, B.j. Xiao, O.y. Huang, Z.j. Guo, L.l. Liu, S.j. Wang, M.h. KongAbstract:The paper proposes that a Low Aspect Ratio tokamak can be a driver of a subcritical blanket to breed fissile material and transmute high level waste (HLW). The transmutation and energy amplifying principle are described. Multifunctional blanket analysis shows that this kind of reactor offers possibilities to breed fissile material, transmute HLW, and produce high energy amplification as well. After 30 years opeRation, this type of reactor can transmute all the HLW initially loaded and the BHP level is greatly decreased. By comparison with other transmutation devices, this type of reactor has many advantages and should receive more attention.
K.e. Thome - One of the best experts on this subject based on the ideXlab platform.
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On virial analysis at Low Aspect Ratio
Physics of Plasmas, 2016Co-Authors: Michael W. Bongard, J.l. Barr, Raymond J. Fonck, Joshua A. Reusch, K.e. ThomeAbstract:The validity of virial analysis to infer global MHD equilibrium poloidal beta βp and internal inductance li from external magnetics measurements is examined for Low Aspect Ratio configuRations with A
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Public Data Set: On Virial Analysis at Low Aspect Ratio
2016Co-Authors: Michael W. Bongard, J.l. Barr, Raymond J. Fonck, Joshua A. Reusch, K.e. ThomeAbstract:This public data set contains openly-documented, machine readable digital research data published in M.W. Bongard, et al., 'On Virial Analysis at Low Aspect Ratio,' Phys. Plasmas 23, 072508 (2016).
G. J. Korotky - One of the best experts on this subject based on the ideXlab platform.
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Low-Aspect-Ratio Rib Heat Transfer Coefficient Measurements in a Square Channel
Journal of Turbomachinery, 1998Co-Authors: Mohammad E. Taslim, G. J. KorotkyAbstract:Cooling channels, roughened with repeated ribs, are commonly employed as a means of cooling turbine blades. The increased level of mixing induced by these ribs enhances the convective heat transfer in the blade cooling cavities. Many previous investigations have focused on the heat transfer coefficient on the surfaces between these ribs and only a few studies report the heat transfer coefficient on the rib surfaces themselves. The present study investigated the heat transfer coefficient on the surfaces of round-corner, Low-Aspect-Ratio (AR rib = 0.667) ribs. Twelve rib geometries, comprising three rib height-to-channel hydraulic diameters (blockage Ratios) of 0.133, 0.167, and 0.25 as well as three rib spacings (pitch-to-height Ratios) of 5, 8.5, and 10 were investigated for two distinct thermal boundary conditions of heated and unheated channel walls. A square channel, roughened with Low-Aspect-Ratio ribs on two opposite walls in a staggered manner and perpendicular to the fLow direction, was tested. An instrumented copper rib was positioned either in the middle of the rib arrangements or in the furthest upstream location. Both rib heat transfer coefficient and channel friction factor for these Low-Aspect-Ratio ribs were also compared with those of square ribs, reported previously by the authors. Heat transfer coefficients of the furthest upstream rib and that of a typical rib located in the middle of the rib-roughened region of the passage wall were also compared.
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Low-Aspect-Ratio Rib Heat Transfer Coefficient Measurements in a Square Channel
Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration, 1997Co-Authors: Mohammad E. Taslim, G. J. KorotkyAbstract:Cooling channels, roughened with repeated ribs, are commonly employed as a means of cooling turbine blades. The increased level of mixing induced by these ribs enhances the convective heat transfer in the blade cooling cavities. Many previous investigations have focused on the heat transfer coefficient on the surfaces between these ribs and only a few studies report the heat transfer coefficient on the rib surfaces themselves. The present study investigated the heat transfer coefficient on the surfaces of round-corner, Low-Aspect-Ratio (ARrib = 0.667) ribs. Twelve rib geometries, comprising of three rib height-to-channel hydraulic diameter (blockage Ratios) of 0.133, 0.167, and 0.25 as well as three rib spacings (pitch-to-height Ratios) of 5, 8.5, and 10 were investigated for two distinct thermal boundary conditions of heated and unheated channel walls. A square channel, roughened with Low-Aspect-Ratio ribs on two opposite walls in a staggered manner end perpendicular to the fLow direction was tested. An instrumented copper rib was positioned either in the middle of the rib arrangements or in the furthest upstream location. Rib heat transfer coefficient as well as the channel friction factor for these Low-Aspect-Ratio ribs were also compared with those of square ribs, reported previously by the authors. Heat transfer coefficients of the furthest upstream rib and that of a typical rib located in the middle of the rib-roughened region of the passage wall were also compared.Copyright © 1997 by ASME
Min Jun Kim - One of the best experts on this subject based on the ideXlab platform.
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Low Aspect Ratio micropores for single-particle and single-cell analysis.
Electrophoresis, 2015Co-Authors: Gaurav Goyal, Rafael Mulero, Jamel Ali, Armin Darvish, Min Jun KimAbstract:This paper describes microparticle and bacterial translocation studies using Low Aspect Ratio solid-state micropores. Micropores, 5 μm in diameter, were fabricated in 200 nm thick free-standing silicon nitride membranes, resulting in pores with an extremely Low Aspect Ratio, nominally 0.04. For microparticle translocation experiments, sulfonated polystyrene microparticles and magnetic microbeads in size range of 1-4 μm were used. Using the microparticle translocation characteristics, we find that particle translocations result in a change only in the pore's geometrical resistance while the access resistance remains constant. Furthermore, we demonstrate the ability of our micropore to probe high-resolution shape information of translocating analytes using concatenated magnetic microspheres. Distinct current drop peaks were observed for each microsphere of the multibead architecture. For bacterial translocation experiments, nonflagellated Escherichia coli (strain HCB 5) and wild type flagellated Salmonella typhimurium (strain SJW1103) were used. Distinct current signatures for the two bacteria were obtained and this difference in translocation behavior was attributed to different surface protein distributions on the bacteria. Our findings may help in developing Low Aspect Ratio pores for high-resolution microparticle characterization and single-cell analysis.
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Low Aspect Ratio RESISTIVE PULSE SENSOR FOR SINGLE CELL ANALYSIS
2014Co-Authors: Gaurav Goyal, Rafael Mulero, Min Jun KimAbstract:This paper reports the use of Low-Aspect Ratio micropores for analysis of inorganic particles and bacterial cells using resistive pulse technique. 5 µm diameter pores were drilled in 50 nm thick free standing silicon nitride (SixNy) membranes to obtain an Aspect Ratio of 0.01. Low-Aspect Ratio pore results in high spatial resolution along the analyte length as the ionic current blockade corresponds to sub-parts of analyte present inside the pore. In our experiments, population statistics and shapes of the current blockades were used to determine size and polydispersity for microparticles and distinguish flagellated from non-flagellated bacteria.
Y P Chen - One of the best experts on this subject based on the ideXlab platform.
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Divertor modeling and design for a Low-Aspect-Ratio tokamak transmutation reactor
Fusion Engineering and Design, 2000Co-Authors: Y P Chen, Li Lin, Xiaoping Liu, L J QiuAbstract:The Low Aspect Ratio tokamak has a wider scrape-off-layer, modeling of the SOL plasma in a Low-Aspect-Ratio tokamak transmutation reactor is done in order to construct a database for the design of natural divertor in the reactor. B2 code is applied to modeling. Modeling results show that the wider SOL in Low-A tokamak can reduce plasma temperature, density and energy flux on the target plate of natural divertor compared with thin SOL in convention tokamak, radiation gas puffed into room of the divertor can reduce energy flux on the target plate to very Low level. Based on modeling and relative design experience of divertor, a new structure design of the natural divertor is proposed. The natural divertor consists of 16 modules, each module mainly includes cassette body, vertical target plate, energy dump target plate, wing and liner, dome, cooling tubes and so on, cold He gas puffing is applied to the design. Some key parameters for the design have been obtained.
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a Low Aspect Ratio tokamak transmutation system
Nuclear Fusion, 2000Co-Authors: L J Qiu, Bingjia Xiao, Qing Huang, Y X Chen, Y P Chen, Xiaoju LiuAbstract:A Low Aspect Ratio tokamak transmutation system is proposed as an alternative application of fusion energy on the basis of a review of previous studies. This system includes: (1) a Low Aspect Ratio tokamak as fusion neutron driver, (2) a radioactivity-clean nuclear power system as blanket, and (3) a novel concept of liquid metal centre conductor post as part of the toroidal field coils. In the conceptual design, a driver of 100 MW fusion power under 1 MW/m2 neutron wall loading can transmute the amount of high level waste (including minor actinides and fission products) produced by ten standard pressurized water reactors of 1 GW electrical power output. Meanwhile, the system can produce tritium on a self-sustaining basis and an output of about 2 GW of electrical energy. After 30 years of opeRation, the biological hazard potential level of the whole system will decrease by two orders of magnitude.
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A Low Aspect Ratio tokamak transmutation reactor
Fusion Engineering and Design, 1998Co-Authors: L J Qiu, Y P Chen, B.j. Xiao, O.y. Huang, Z.j. Guo, L.l. Liu, S.j. Wang, M.h. KongAbstract:The paper proposes that a Low Aspect Ratio tokamak can be a driver of a subcritical blanket to breed fissile material and transmute high level waste (HLW). The transmutation and energy amplifying principle are described. Multifunctional blanket analysis shows that this kind of reactor offers possibilities to breed fissile material, transmute HLW, and produce high energy amplification as well. After 30 years opeRation, this type of reactor can transmute all the HLW initially loaded and the BHP level is greatly decreased. By comparison with other transmutation devices, this type of reactor has many advantages and should receive more attention.
