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2016 Transactions of the American Nuclear Society, ANS 2016

作者： Schunert, Sebastian Hammer, Hans Lou, Jijie Wang, Yaqi Ortensi, Javier Gleicher, Frederick Baker, Benjamin Dehart, Mark Martineau, Richard Idaho National Laboratory Nuclear Methods Development Idaho FallsID United States Department of Nuclear Engineering Texas A and M University College StationTX United States Idaho National Laboratory Reactor Physics Analysis and Design Idaho FallsID United States Idaho National Laboratory Nuclear Science and Technology Modeling and Simulation Idaho FallsID United States

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Study on Unbalance Magnetic Pull of the Motorized Spindle under Different Rotor Eccentricities

Study on Unbalance Magnetic Pull of the Motorized Spindle un...

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International Conference on Ubiquitous Robots and Ambient Intelligence

作者： Jin Wang Minqing Jing Hongwei Fan Heng Liu Bijia Shi Key Laboratory of Education Ministry for Modern Design & Rotor-bearing System School of Mechanical Engineering Xi'an University of Science and Technology

ISBN: (纸本)9781509008223

High-speed precision machining is one of the important development directions of modern machining technology, high-speed spindle system is widely used in high-speed machining, and motorized spindle is the main choice of the high-speed machine tool spindle. The electromagnetic force caused by rotor unbalance is one of main vibration sources of motorized spindle. Firstly, the research on the frequency spectrum characteristic of electromagnetic force under different rotor eccentricities is very necessary to suppress electromagnetic vibration. An electromagnetic finite element model was built for a motorized spindle based on Ansoft Maxwell in this paper. The electromagnetic force spectrum variation under the static and dynamic eccentricities is studied. The Unbalance Magnetic Pull (UMP) of the motorized spindle under different rotating speeds and different eccentricities are analysed. The results show that the motorized spindle with the static or dynamic eccentricity both produces new components in the electromagnetic force. Simultaneously, the eccentricity increase positively results in the increase of UMP amplitude. The UMP is constant under the rotor static eccentricity, which has a small impact on rotor vibration, while the frequency of UMP under the rotor dynamic eccentricity is the rotating frequency, which will increase the motorized spindle vibration. Finally, by the experiment the correctness of theoretical analysis and simulation are verified. This work provides a theoretical foundation for the fault diagnosis and dynamic balance of the motorized spindle.

关键词： Machine tool motorized spindle Unbalance Magnetic Pull (UMP) Rotor eccentricity Finite element analysis Frequency spectrum analysis

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Large eddy simulation of turbulent flow in the rod bundle with different spacer grids 23

Large eddy simulation of turbulent flow in the rod bundle wi...

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

作者： Wei, Zonglan Yu, Zhang Liu, Songtao Science and Technology on Reactor System Design Technology Laboratory NPIC Chengdu Sichuan China Nuclear Power Design and Research Sub-Institute NPIC Chengdu Sichuan China

ISBN: (纸本)9784888982566

Large eddy simulation(LES) of the swirling flow in the rod bundle subchannels with spacer grids are presented. According to the rod bundle flow benchmark experiment, the 5×5 rod bundle with a split-type spacer grid is simulated by this transient simulation with a fine hybrid mesh. Mean velocity components, RMS (root mean square) velocity components and turbulent kinetic energy profiles at different locations downstream the mixing vanes are compared between the experiment and simulation results. LES results can reproduce the mixing turbulent flow velocity field well. We also have studied the influence of the mixing vanes' bending degree on the subchannel flow structures by using LES to simulate the 3×3 rod bundle with the typical PWR spacer grid. The mixing vanes' bending degree is modified to 35°and 40°based on the original spacer grid, whose mixing vanes' bending degree is 30°. The larger bending degree produces a stronger mean coolant mixing effect, while larger pressure loss and fluctuation come together with this effect. The increased pressure loss would generate additional flow resistance, and larger fluctuation of coolant flow would make the mixing effect unstable, as well as would cause flow-induced vibration and grid-to-rod fretting phenomena. The LES method is a viable tool to optimize the spacer grid design and provide transient flow field data for mechanical analysis. Copyright © 2015 by JSME.

关键词： Mixing

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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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Electro-hydraulic Load Simulation Method for Helicopter Booster

Electro-hydraulic Load Simulation Method for Helicopter Boos...

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2016 IEEE/CSAA International Conference on Aircraft Utility systems(AUS)

作者： Yang Fang Hao Yanyan He Peng Henan Provincial Key Laboratory of mechanical design and transmission system Henan University of Science and Technology Beijing Institute of Structure & Environment Engineering

In this paper we present an electro-hydraulic load simulation method for the helicopter *** on electro-hydraulic servo control technology,we construct the load simulation *** then,the mathematical model of load simulation system for the booster is *** position servo system controller is combined of hysteresis compensation with PI controller and the force servo system controller is designed by servo-compensation and fuzzy PID ***,the performance of the proposed elector-hydraulic load simulation method is validated through the position tracking and load simulation experiments.

关键词： electro-hydraulic servo system load simulation mathematical model surplus force control method

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Application of STPA to the digital reactor protection system in NPP for system safety analysis 23

Application of STPA to the digital reactor protection system...

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

作者： Liu, Zhaohui Wu, Zhiqiang Yang, Xiaohua School of Computer Science and Technology University of South China Hengyang421001 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

ISBN: (纸本)9784888982566

In NPP, the digital control system which integrated software and hardware are increasingly used to improve dependability and introduce new functionality. Traditional safety analysis can get a good result when handling accidents caused by component failures, but software does not fail in this way. STPA is a new hazard analysis technique based on systems theory rather than reliability theory. It considers the system as a whole (include the hardware and software) to analyze failure and causality of systems and treats safety as a control problem rather than a failure problem. Being a safety-critical system, RPS in NPP needs to be considered carefully in system safety. So, we adopt this new approach to analyze the design process. From the analysis results, we found that causal factors leading to safety accidents identified by STPA included all the hazards identified by the fault tree analysis. Furthermore, there are some causal factors that were identified by STPA only. We utilize these results of the analysis on causation factor to refine the safety requirements and reduce the occurrences of the hazardous scenarios. Copyright © 2015 by JSME.

关键词： Fault tree analysis

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The Software safety analysis based on sfta for reactor power regulating system in nuclear power plant 23

The Software safety analysis based on sfta for reactor power...

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

作者： Liu, Zhaohui Liao, Longtao Wu, Zhiqiang Yang, Xiaohua School of Computer Science and Technology University of South China Hengyang421001 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

ISBN: (纸本)9784888982566

The digitalized Instrumentation and Control (I&C) system of Nuclear power plants can provide many advantages. However, digital control systems induce new failure modes that differ from those of analog control systems. While the cost effectiveness and flexibility of software is widely recognized, it is very difficult to achieve and prove high levels of dependability and safety assurance for the functions performed by process control software, due to the very flexibility and potential complexity of the software itself. Software safety analysis (SSA) was one way to improve the software safety by identify the system hazards caused by software failure. This paper describes the application of a software fault tree analysis (SFTA) at the software design phase. At first, we evaluate all the software modules of the reactor power regulating system in nuclear power plant and identify various hazards. The SFTA was applied to some critical modules selected from the previous step. At last, we get some new hazards that had not been identified in the prior processes of the document evaluation which were helpful for our design. Copyright © 2015 by JSME.

关键词： Nuclear power plants

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CFD simulation of single-phase flow in a 5×5 rod bundle with spacer grid 23

CFD simulation of single-phase flow in a 5×5 rod bundle wit...

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

作者： Li, Quan Jiao, Yongjun Chen, Jie Yu, Junchong Department of Engineering Physics Tinghua University Beijing China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9784888982566

Spacer grid is an important component in PWR fuel assemblies for its significant influence on thermal-hydraulic characteristics of the reactor core. In this study, single-phase CFD technology is used to study the flow and resistance in a 5×5 rod bundle with spacer grid. CFX 12 is chosen as the tool software. The geometries of spacer grid and rod bundle are finished by UG code. To simulate the contact of springs and dimples with fuel rods, small gaskets are induced. The SST model is chosen for turbulent simulation. The results of resistance coefficients including both local loss coefficients and frictional loss coefficients under different Re numbers are conformed well to the experiment. The agreement of calculated liquid velocity distribution downstream the spacer grid with the experiment is also well but less satisfactory. We draw attention to the influence of mixing vanes and find that mixing vanes are the main components that induce the lateral flow, but take up little percents in the local loss coefficient of spacer grid. The lateral flow caused by mixing vanes will increase the frictional loss coefficient downstream the spacer grid. These results are beneficial to the optimization design of spacer grid. Copyright © 2015 by JSME.

关键词： Turbulence models

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The Liver Tumor Segmentation Benchmark (LiTS)

arXiv

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arXiv 2019年

作者： Bilic, Patrick Christ, Patrick Li, Hongwei Bran Vorontsov, Eugene Ben-Cohen, Avi Kaissis, Georgios Szeskin, Adi Jacobs, Colin Mamani, Gabriel Efrain Humpire Chartrand, Gabriel Lohöfer, Fabian Holch, Julian Walter Sommer, Wieland Hofmann, Felix Hostettler, Alexandre Lev-Cohain, Naama Drozdzal, Michal Amitai, Michal Marianne Vivanti, Refael Sosna, Jacob Ezhov, Ivan Sekuboyina, Anjany Navarro, Fernando Kofler, Florian Paetzold, Johannes C. Shit, Suprosanna Hu, Xiaobin Lipková, Jana Rempfler, Markus Piraud, Marie Kirschke, Jan Wiestler, Benedikt Zhang, Zhiheng Hülsemeyer, Christian Beetz, Marcel Ettlinger, Florian Antonelli, Michela Bae, Woong Bellver, Míriam Bi, Lei Chen, Hao Chlebus, Grzegorz Dam, Erik B. Dou, Qi Fu, Chi-Wing Georgescu, Bogdan Giró-I-Nieto, Xavier Gruen, Felix Han, Xu Heng, Pheng-Ann Hesser, Jürgen Moltz, Jan Hendrik Igel, Christian Isensee, Fabian Jäger, Paul Jia, Fucang Kaluva, Krishna Chaitanya Khened, Mahendra Kim, Ildoo Kim, Jae-Hun Kim, Sungwoong Kohl, Simon Konopczynski, Tomasz Kori, Avinash Krishnamurthi, Ganapathy Li, Fan Li, Hongchao Li, Junbo Li, Xiaomeng Lowengrub, John Ma, Jun Maier-Hein, Klaus Maninis, Kevis-Kokitsi Meine, Hans Merhof, Dorit Pai, Akshay Perslev, Mathias Petersen, Jens Pont-Tuset, Jordi Qi, Jin Qi, Xiaojuan Rippel, Oliver Roth, Karsten Sarasua, Ignacio Schenk, Andrea Shen, Zengming Torres, Jordi Wachinger, Christian Wang, Chunliang Weninger, Leon Wu, Jianrong Xu, Daguang Yang, Xiaoping Yu, Simon Chun-Ho Yuan, Yading Yue, Miao Zhang, Liping Cardoso, Jorge Bakas, Spyridon Braren, Rickmer Heinemann, Volker Pal, Christopher Tang, An Kadoury, Samuel Soler, Luc van Ginneken, Bram Greenspan, Hayit Joskowicz, Leo Menze, Bjoern Department of Informatics Technical University of Munich Germany Department of Quantitative Biomedicine University of Zurich Switzerland Ecole Polytechnique de Montréal Canada Department of Medical Imaging Radboud University Medical Center Nijmegen Netherlands Department of Biomedical Engineering Tel-Aviv University Israel Germany Pattern Analysis and Learning Group Department of Radiation Oncology Heidelberg University Hospital Heidelberg Germany Philips Research China Philips China Innovation Campus Shanghai China School of Biomedical Engineering & Imaging Sciences King0s College London London United Kingdom Institute for AI in Medicine Technical University of Munich Germany Department of Computer Science Guangdong University of Foreign Studies China Institute for diagnostic and interventional radiology Klinikum rechts der Isar Technical University of Munich Germany Institute for Diagnostic and Interventional Neuroradiology Klinikum Rechts der Isar Technical University of Munich Germany Department of Hepatobiliary Surgery The Affiliated Drum Tower Hospital Nanjing University Medical School China Department of Computing Imperial College London London United Kingdom Institute for Tissue Engineering and Regenerative Medicine Helmholtz Zentrum München Neuherberg Germany Brigham and Women's Hospital Harvard Medical School United States School of Computer Science and Engineering The Hebrew University of Jerusalem Israel University of Pennsylvania PA United States Pte. Ltd. Singapore Medical Imaging and Reconstruction Lab Department of Engineering Design Indian Institute of Technology Madras India Sensetime Shanghai China Department of Radiology Perelman School of Medicine University of Pennsylvania United States Department of Pathology and Laboratory Medicine Perelman School of Medicine University of Pennsylvania PA United States Co. Ltd China MontréalQC Canada Department of Radiology Radiation Oncology and Nuclear Medicine University of Montréal

In this work, we report the set-up and results of the Liver Tumor Segmentation Benchmark (LiTS), which was organized in conjunction with the IEEE International Symposium on Biomedical Imaging (ISBI) 2017 and the International Conferences on Medical Image Computing and Computer-Assisted Intervention (MICCAI) 2017 and 2018. The image dataset is diverse and contains primary and secondary tumors with varied sizes and appearances with various lesion-to-background levels (hyper-/hypo-dense), created in collaboration with seven hospitals and research institutions. Seventy-five submitted liver and liver tumor segmentation algorithms were trained on a set of 131 computed tomography (CT) volumes and were tested on 70 unseen test images acquired from different patients. We found that not a single algorithm performed best for both liver and liver tumors in the three events. The best liver segmentation algorithm achieved a Dice score of 0.963, whereas, for tumor segmentation, the best algorithms achieved Dices scores of 0.674 (ISBI 2017), 0.702 (MICCAI 2017), and 0.739 (MICCAI 2018). Retrospectively, we performed additional analysis on liver tumor detection and revealed that not all top-performing segmentation algorithms worked well for tumor detection. The best liver tumor detection method achieved a lesion-wise recall of 0.458 (ISBI 2017), 0.515 (MICCAI 2017), and 0.554 (MICCAI 2018), indicating the need for further research. LiTS remains an active benchmark and resource for research, e.g., contributing the liver-related segmentation tasks in http://***/. In addition, both data and online evaluation are accessible via ***. © 2019, CC BY-NC-ND.

关键词： Deep learning

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Research of the bundle CHF prediction based on the minimum DNBR point and the BO point methods 16

Research of the bundle CHF prediction based on the minimum D...

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

作者： Liu, Wei Shan, Jianqiang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China School of Nuclear Science and Technology Xi'an Jiao Tong University Xi'an710049 China

ISBN: (纸本)9781510811843

There are two ways in the development of CHF correlation in rod bundles: one is based on round tube CHF correlations, considering the effects of spacers and CHF promoters, effects of cold walls, etc. The other one is to develop the correlation directly using the rod bundles CHF experimental data which includes two methods: me minimum DNBR point method and the BO point method. In this study, the local thermal-hydraulic parameters at DNB occurrence point of each set of bundle CHF data were obtained by using the subchannel code ATHAS. Both of the minimum DNBR point and the BO point methods were then applied to develop a new CHF correlation for rod bundles. The so-called "three-step method" was used to determine the shape of me correlation and the non-linear regression analysis method was applied to determine the coefficients of the correlation. Based on the large database of CHF tests, a new CHF correlation named the ACC correlation has been developed. The analysis and assessment results indicate that me ACC correlation can fit the experimental data well with high prediction accuracy and correct parametric trends. Compared with the minimum DNBR point method, me BO point method is recommended to predict me risk of DNB because it is more reasonable and conservative with better predication rate. Coupled with subchannel code ATHAS, this correlation can simulate the thermalhydraulics performances of rod bundles exactly.

关键词： Forecasting

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