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16th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2015

作者： Feng, Li Science and Technology on Reactor System Design Technology Laboratory ChangShun Avenue 328 ShuangLiuCounty ChengDu China

ISBN: (纸本)9781510811843

A 3rd generation reactor called HuaLong is developed by china national Nuclear Corporation (CNNC). S econdary passive system (PRS) is designed to remove the residual heat during 72 hours after the reactor trips. To verify the ability of PRS system, the test facility ESPRIT is built in Chengdu which is 1:1 in heigh t and 1/62.5 in power. Tests are consisted by three Steady-states and one transient. One model of RELAP5 mod3.2 is developed and used to simulate the steady and transient tests. The results of RJELAP5 show con sistent with facility results, but the early phenomenon during transients is different between RELAP5 and tests as RELAP5 underestimates the direct-contact condensation power.

关键词： Condensation

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Study on hydrogen flame acceleration and ddt properties at elevated temperatures and pressures 23

Study on hydrogen flame acceleration and ddt properties at e...

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23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015

作者： Peng, Huanhuan Yu, Hongxing Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

ISBN: (纸本)9784888982566

Hydrogen security is an important problem of the severe accident analysis in NPP, and the security of hydrogen detonation is more important. The hydrogen risk mainly focused on the risk of flame acceleration (FA) and deflagration-to-detonation transition (DDT) processes. As the processes involved in combustion and detonation are quite complex, it is difficult to present a detailed description of the whole process. Based on the physical phenomena of flame acceleration, the present paper brief introduces two criteria for hydrogen security analysis of detonation, which are FA σ criteria and DDT λ criteria. From the present paper, effect of initial pressures and temperatures on FA and DDT has been discussed. It describes the limit condition of flame acceleration by the quench/re-ignition of flammable gas mixture theory. So as to promote the flame acceleration criteria at elevated temperatures and pressures from the former one. Last the application for hydrogen safety analysis in GASFLOW code has been recommended. Copyright © 2015 by JSME.

关键词： Combustion

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Numerical research on rotating speed influence and flow state distribution of water-lubricated thrust bearing 23

Numerical research on rotating speed influence and flow stat...

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23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015

作者： Deng, Xiao Deng, Li-Ping Huang, Wei Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

ISBN: (纸本)9784888982566

Water-lubricated thrust bearing is one of the key parts in canned motor pump, for example, the RCP in AP1000, and it functions to balance axial loads. A calculation model which can handle all flow state lubrication performance for water-lubricated thrust bearing has been presented. The model first includes laminar and turbulent Reynolds' equation. Then to get continuous viscosity coefficients cross critical Reynolds number, a transition zone which ranges based on engineering experience is put up, through which Hermite interpolation is employed. The model is numerically solved in finite difference method with uniform grids. To accelerate the calculation process, multigrid method and line relaxation is adopted within the iteration procedure. A medium sized water-lubricated tilting pad thrust bearing is exampled to verify the calculation model. Results suggest that as rotating speed enlarges, lubrication state distribution of the thrust bearing gradually tends to turbulent lubrication from the intersection corner of pad outer diameter and pad inlet to the opposite, minimum water film thickness increases approximately linearly, maximum water film pressure has little change, meanwhile the friction power grows nearly in exponential law which could result in bad effect by yielding much more heat. Copyright © 2015 by JSME.

关键词： Iterative methods

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Novel magnesium borides and their superconductivity

arXiv

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arXiv 2017年

作者： Mahdi Davari Esfahani, M. Zhu, Qiang Dong, Huafeng Oganov, Artem R. Wang, Shengnan Rakitin, Maksim S. Zhou, Xiang-Feng Department of Geosciences Center for Materials by Design Institute for Advanced Computational Science State University of New York Stony BrookNY11794-2100 United States Skolkovo Institute of Science and Technology Skolkovo Innovation Center 3 Nobel St. Moscow143026 Russia Moscow Institute of Physics and Technology 9 Institutskiy Lane Dolgoprudny City Moscow Region141700 Russia International Center for Materials Design Northwestern Polytechnical University Xi’an710072 China NSLS-II Brookhaven National Laboratory UptonNY11973-5000 United States School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics Nankai University Tianjin300071 China

With the motivation of searching for new superconductors in the Mg-B system, we performed ab initio evolutionary searches for all the stable compounds in this binary system in the pressure range of 0-200 GPa. We found previously unknown, yet thermodynamically stable, compositions MgB3 and Mg3B10. Experimentally known MgB2 is stable in the entire pressure range 0-200 GPa, while MgB7 and MgB12 are stable at pressures below 90 GPa and 35 GPa, respectively. We predict a reentrant behavior for MgB4, which becomes unstable against decomposition into MgB2 and MgB7 at 4 GPa and then becomes stable above 61 GPa. We find ubiquity of phases with boron sandwich structures analogous to the AlB2-type structure. However, with the exception of MgB2, all other magnesium borides have low electron-phonon coupling constants λ of 0.32 to 0.39 and are predicted to have Tc below 3 K. Copyright © 2017, The Authors. All rights reserved.

关键词： Aluminum compounds

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Simulation of body force effect on steady and unsteady flow induced by DBD plasma actuator 47

Simulation of body force effect on steady and unsteady flow ...

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47th AIAA Plasmadynamics and Lasers Conference, 2016

作者： Wu, Bin Gao, Chao Liu, Feng Xiong, Juntao Department of Fluid Mechanics Northwestern Polytechnical University Xi’an710072 China National Key Laboratory of Science and Technology on Aerodynamic Design and Research Northwestern Polytechnical University Xi’an710072 China Department of Mechanical and Aerospace Engineering University of California IrvineCA92697-3975 United States

ISBN: (数字)9781624104343

ISBN: (纸本)9781624104343

The density field induced by Dielectric-Barrier-Discharge (DBD) plasma actuation is visualized through the schlieren photography. Meanwhile, based on PIV system, velocity fields are accurately measured. In steady plasma flow, continuous discharge is applied. On the other side, duty-cycle discharge is used in unsteady plasma flow study. By solving the Maxwell’s electromagnetic equations, a model of body force is established. Based on this electro-static model, numerical simulation of flow over the plate with DBD plasma actuators are presented. Comparisons of computation and experiment of steady and unsteady plasma flows are consistent in both continuous discharge and duty-cycle discharge. Experiment of PIV and schlieren results verify the correctness of the model which can be applied to both steady and unsteady flow. The result also shows that there are vortexes forming upon the encapsulated electrode near the gap side, and move with the direction of other side of encapsulated electrode in the duty-cycle discharge. When duty-cycle increasing fromt =0.3 tot =0.5, vortexes near the plasma actuator are more concentrated. In continuous discharge, that ist =1, the vortex flow become the jet flow. The vortexes play a very important role in the mechanism research of flow induced by DBD plasma actuators. © 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Vortex flow

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Multiple unpinned Dirac points in group-Va single-layers with phosphorene structure

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npj Computational Materials 2016年第1期2卷 142-148页

作者： Yunhao Lu Di Zhou Guoqing Chang Shan Guan Weiguang Chen Yinzhu Jiang Jianzhong Jiang Xue-sen Wang Shengyuan A Yang Yuan Ping Feng Yoshiyuki Kawazoe Hsin Lin School of Materials Science and Engineering Zhejiang UniversityHangzhouChina State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhouChina Centre for Advanced 2D Materials and Graphene Research Centre National University of SingaporeSingaporeSingapore Department of Physics National University of SingaporeSingaporeSingapore Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingaporeSingapore College of Physics and Electronic Engineering Zhengzhou Normal UniversityZhengzhouChina New Industry Creation Hatchery Center Tohuku UniversitySendaiJapan Institute of Thermophysics Siberian Branch of Russian Academy of SciencesNovosibirskRussia

Emergent Dirac fermion states underlie many intriguing properties of graphene,and the search for them constitutes one strong motivation to explore two-dimensional(2D)allotropes of other ***,the ultrathin layers of black phosphorous,has been a subject of intense investigations recently,and it was found that other group-Va elements could also form 2D layers with similar puckered lattice ***,by a close examination of their electronic band structure evolution,we discover two types of Dirac fermion states emerging in the low-energy *** pair of(type-I)Dirac points is sitting on high-symmetry lines,while two pairs of(type-II)Dirac points are located at generic k-points,with different anisotropic dispersions determined by the reduced symmetries at their *** fully-unpinned(type-II)2D Dirac points are discovered for the first *** the absence of spin-orbit coupling(SOC),we find that each Dirac node is protected by the sublattice symmetry from gap opening,which is in turn ensured by any one of three point group *** SOC generally gaps the Dirac nodes,and for the type-I case,this drives the system into a quantum spin Hall insulator *** suggest possible ways to realise the unpinned Dirac points in strained phosphorene.

关键词： structure spectrum Dirac

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An Algorithm for Global Path Planning and Multi-objective Optimization Using Cell Mapping

An Algorithm for Global Path Planning and Multi-objective Op...

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第十届全国动力学与控制学术会议

作者： XUE Yang XIONG Fu-rui SUN Jian-qiao Department of Mechanics Tianjin UniversityTianjin300350China Science and Technology on Reactor System Design Technology LaboratoryNuclear Power Institute of ChinaChengdu 610041China School of EngineeringUniversity of CaliforniaMercedCA 95343USA

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Multi-objective Optimization of Elastic Beams For Minimum Weight and Sound Radiation

Multi-objective Optimization of Elastic Beams For Minimum We...

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第十届全国动力学与控制学术会议

作者： Meng-xin He Fu-Rui Xiong Yousef Naranjani Qian Ding Jian-Qiao Sun Department of Mechanics Tianjin University Tianjin300072China Science and Technology on Reactor System Design Technology LaboratoryNuclear Power Institute of ChinaChengdu 610041China School of EngineeringUniversity of California MercedCA 95343USA

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CFD simulation of direct contact condensation phenomenon of vapor in subcooled water tank 23

CFD simulation of direct contact condensation phenomenon of ...

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23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015

作者： Ji, Yu Quan, Yan Zhang, Yining Zhang, Haochun Wang, Yahui Harbin Institute of Technology Harbin Heilongjiang China Science and Technology on Reactor System Design Technology Laboratory Chengdu Sichuan China

ISBN: (纸本)9784888982566

The direct contact condensation (DCC) is a significant phenomenon in nuclear reactor and its balance facilities, together with other chemical engineering systems. DCC occurs when the vapor is injected into the subcooled water, contacts and condenses on the interface directly. The DCC phenomenon accompanied with the heat transfer and mass transfer will result in the temperature and pressure fluctuations in the tank. This paper discusses the DCC in the subcooled water tank from the view of computation fluid dynamics. The numerical simulation was performed with the CFD software, Fluent, in which the direct contact condensation phenomenon was modeled with the Euler-Euler framework for two phases flow, and the evaporation & condensation model was adopted to simulate the mass transfer process. During the simulation process, the flow field and temperature field are derived. In addition, the shape and size of plume jet are also investigated. Copyright © 2015 by JSME.

关键词： Heat transfer

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The Blood Compatibility Challenge

SSRN

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SSRN 2019年

作者： Jaffer, Iqbal H. Weitz, Jeffrey I. Brash, John L. Horbett, Thomas A. Latour, Robert A. Tengvall, Pentti Gorbet, Maud Sperling, Claudia Maitz, Manfred F. Siedlecki, Christopher A. Werner, Carsten Sefton, Michael V. Maitz, Manfred F. Martins, M. Cristina L Grabow, Niels Matschegewski, Claudia Huang, Nan Chaikof, Elliot L. Barbosa, Mário A. Werner, Carsten Thrombosis and Atherosclerosis Research Institute McMaster University 237 Barton Street East HamiltonONL8L 2X2 Canada McMaster University HamiltonON Canada University of Washington SeattleWA United States Clemson University ClemsonSC United States Gothenburg University Gothenburg Sweden Department of System Design Engineering University of Waterloo WaterlooON Canada Institute Biofunctional Polymer Materials Max Bergmann Center of Biomaterials Leibniz-Institut für Polymerforschung Dresden e.V. Dresden Germany Department of Surgery The Pennsylvania State University College of Medicine Hershey PA17033 United States Department of Bioengineering The Pennsylvania State University College of Medicine Hershey PA17033 United States University of Toronto Institute Biofunctional Polymer Materials Max Bergmann Center of Biomaterials Leibniz-Institut für Polymerforschung Dresden e.V. Dresden Germany i3S Instituto de Investigacao e Inovacao em Saude INEB Instituto de Engenharia Bionedica Rua Alfredo Allen 208 Porto4200-135 Portugal ICBAS Instituto de Ciencias Bioedicas Abel Salazar Universidade do Porto Porto Portugal Institut für Biomedizinische Technik Universitätsmedizin Rostock Friedrich-Barnewitz-Str. 4 Rostock18119 Germany Key Laboratory of Advanced Technology for Materials of Education Ministry School of Materials Science and Engineering Southwest Jiaotong University Chengdu610031 China Beth Israel Deaconess Medical Center Harvard Medical School 330 Brookline Avenue BostonMA02115 United States Wyss Institute for Biologically Inspired Engineering Harvard University 3 Blackfan Circle BostonMA02115 United States Harvard-MIT Division of Health Sciences and Technology 77 Massachusetts Avenue CambridgeMA02139 United States

Despite >50 years of study, there are no materials that are considered truly nonthrombogenic. Some materials minimize protein adsorption or cell adhesion while others actively inhibit thrombin generation through heparinization. Nonetheless the problem of biomaterial associated thrombogenicity remains. While once an active area of research, the problem has not only not been solved, it has also been largely abandoned. It is considered too hard or efforts attack only one particular aspect of the problem or more broadly new ideas and approaches have not been brought to bear. This frustration has led to a series of review papers where we summarize the features of broad agreement and provide commentary on those aspects of the problem that were subject to dispute. These are (see also Figure 1): 1. Blood-contacting medical devices: The scope of the problem;2. Protein adsorption phenomena governing blood reactivity;3. Material associated activation of blood cascades and cells;4. Surface modification for hemocompatible materials: passive and active approaches to guide blood-material interactions. We were inspired by the structure of the >1500 year old book of Jewish laws, called the Talmud, in which commentaries are layered on commentaries to interpret and reinterpret a biblical law. It takes the form of a record of discussions pertaining to Jewish law, ethics, philosophy, customs and history. Here we began with what we believed to be a generally accepted truth regarding thrombogenicity and then added our thoughts and commentaries regarding with respect to aspects that were not as scientifically firm as the opening "truth." We hope that future investigators will update these reviews as new scholarship resolves the uncertainties of today. © 2019, The Authors. All rights reserved.

关键词： Cell adhesion

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