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Coupled thermal-mechanical analysis of two ITER-like first wall mockups under heat shock of plasma disruptions

Science China(Technological Sciences) 2016年第3期59卷 476-487页

作者： HUANG ShengHong ZHAO YongQiang WANG weihua School of Engineering Science University of Science and Technology of China Institute of Applied Physics of Army Office Academic

The first wall of the fusion reactor is a plasma-facing component and is a key link to maintain the integrity of structure during thermal shock induced by plasma disruptions. Be and W/Cu functionally graded materials are two kinds of important plas- ma-facing materials （PFM） of first wall in fusion reactor currently. Previous researches seldom comparatively evaluated the normal servicing and heat shock resistance performance of first walls with those two kinds of PFMs. And also there lacks cou- pled thermal/mechanical analysis on the heat shock process in consideration of multiple thermal/mechanical phenomena, such as material melting, solidification, evaporation, etc., which is significant to further understand the heat shock damage mecha- nism of the first wall with different PFMs. With the aim of learning more detailed mechanical mechanism of thermal shock damage and then improving the thermal shock resistance performance of different first wall designs, the coupled ther- mal/mechanical response of two typical ITER-like first walls with PFM of Be and functionally graded W-Cu respectively un- der the heat shock of 1 2 GW/m2 are computed by the finite element method. Special considerations of elastic-plastic defor- mation, material melting, and solidification are included in numerical models and methods. The mechanical response behaviors of different structures and materials under the normal servicing operation as well as plasma disruption conditions are analyzed and investigated comparatively. The results reveal that heat is mainly deposited on the PFM layer in thc high energy shock pulse induced by plasma disruptions, resulting in complex thermal stress change as well as mechanical itTeversible damage of thermal elastic and plastic expansion, contraction and yielding. Compared with the first wall with Be PFM, which mitigates the damages from heat shock at most only in the PFM layer with cost of whole PFM layer plastic yielding, the first wall with graded W-Cu PFM

关键词： first wall plasma facing component plasma disruptions thermal shock resistance finite element method

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Abnormal Vertical Dynamic Performance of Subway Vehicles

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Chinese Journal of Mechanical Engineering 2010年第2期23卷 174-179页

作者： MA weihua LUO Shihui SONG Rongrong Traction Power State Key Laboratory Southwest Jiaotong University Chengdu 610031 China CSR Ziyang Locomotive Co. Ltd. Ziyang 641301 China College of Computer Science and Technology Southwest University for Nationalities Chengdu 610041 China

A serious wheel out-of-round phenomenon exists in a certain subway vehicle in China. more seriously, the vertical vibration of car body of this subway vehicle will go beyond the restriction of the standard criterion when the wheel out-of-round exceeds 0.2 mm in radial direction. And the wheel out-of-round problem could not be solved by polishing the rail or re-profiling wheels. Aimed at this problem, a further analysis is conducted on the structure and the suspension systems of the subway vehicle. It is thought that the additional stiffness function of the traction bar, caused by the short length and the bigger connection stiffness of the traction bar, leads to the problem that the subway vehicle is sensitive to the vertical impact. By taking into account the stiffness of the traction bar, dynamic simulation models of the subway vehicle are set up to study the influence of the additional stiffness function of the traction bar on the vertical dynamic performance of the subway vehicle through the simulation method. The response of the subway vehicle to vertical impact of a triangle pitch is also simulated. Simulation results indicate that the connection between the car body and the bogie will become rigid and the damping function of the secondary suspension will be decreased due to the additional stiffness of the traction bar in braking condition or running on curve track. Then the vertical response of the car body to vertical impact will be strengthened and the vertical ride index decreased. The vertical dynamic performance of the subway vehicle will be improved through the method of decreasing the connection stiffness of the traction bar, which has been validated by the simulation results. This method of improvement can effectively solve the problem of abnormal dynamic performance of this subway vehicle, and provide a foundation for a new theory about the traction bar system design.

关键词： subway wheel set tread out-of-round dynamic

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DESIGN AND IMPLEMENTATION OF COMPLETELY AUTOMATIC AND CONTINUAL PRODUCTION LINE FOR WATER-IN-OIL(W/O) EMULSION EXPLOSIVE

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中国有色金属学会会刊：英文版 1999年第2期9卷 201-207页

作者： He, Jianjun Yu, Shouyi Gui, weihua Central South Univ of Technology Changsha China

１ＩＮＴＲＯＤＵＣＴＩＯＮＥｘｐｌｏｓｉｖｅｉｓｏｎｅｏｆｔｈｅｔｒｅｍｅｎｄｏｕｓｅｎｅｒｇｙｒｅｓｏｕｒｃｅｓｗｈｉｃｈｐｅｏｐｌｅｏｆｔｅｎｕｔｉｌｉｚｅ．Ｉｔｉｓｎｏｔｏｎｌｙｕｓｅｄｉｎｍｉｌｉｔａｒｙｐ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＥｘｐｌｏｓｉｖｅｉｓｏｎｅｏｆｔｈｅｔｒｅｍｅｎｄｏｕｓｅｎｅｒｇｙｒｅｓｏｕｒｃｅｓｗｈｉｃｈｐｅｏｐｌｅｏｆｔｅｎｕｔｉｌｉｚｅ．Ｉｔｉｓｎｏｔｏｎｌｙｕｓｅｄｉｎｍｉｌｉｔａｒｙｐｕｒｐｏｓｅｓ，ｂｕｔａｌｓｏｕｓ...

关键词： W/O emulsion explosiveautomatic adjusting charge ratioautomatic charge mixingautomatic adjusting output

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The enigmatic processing and secretion of interleukin-33

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Cellular & molecular Immunology 2010年第4期7卷 260-262页

作者： weihua Zhao Zhiqing Hu Department of Microbiology and Immunology Showa University School of MedicineTokyoJapan

Interleukin-33(IL-33)is the most attractive novel cytokine identified as an IL-1 family ***-33 was first named NF-HEV(nuclear factor from high endothelial venules),as it was known to interact with nuclear chromatin although its exact intracellular functions are still to be ***-33 is now recognized as the specific ligand for the orphan IL-1 receptor family member ST2 and to be involved in polarization of T cells towards T helper 2 cell phenotype and in activation of mast cells,bosophils,eosinophils and natural killer *** is essential for IL-33 to be extracellularly released in order to bind to the ST2 receptor and consequently play a crucial role in inflammatory,infectious and autoimmune ***,like the IL-1 family members,IL-1b and IL-18,IL-33 mRNA is translated without a signal sequence for ***,IL-33 cannot be released by the processing and secretion mechanism shared by IL-1b and IL-18 as IL-33 is not a substrate of caspase-1 and does not require proteolysis for *** contrast,IL-33 can be inactivated by apoptotic ***,IL-33 is proposed to be released as an alarmin from necrotic cells but to be deleted during *** the known autocrine,paracrine,intracrine,juxtacrine and retrocrine mechanisms of cellular interaction with cytokines,release by necrotic cells is another pathway for a cytokine to display its function,which we suggest might be called‘necrocrine’.This mini review summarizes recent progress of how IL-33 displays potential immunoregulatory roles with a particular focus on its enigmatic production.

关键词： Interleukin-33 Interleukin-1 family Caspase-1 Intracrine Necrocrine

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Distribution performance of gas–liquid mixture in the shell side of spiral-wound heat exchangers

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Chinese Journal of Chemical Engineering 2019年第10期27卷 2284-2292页

作者： Wenke Zheng weihua Cai Yiqiang Jiang School of Architecture Harbin Institute of TechnologyHarbin 150090China Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information TechnologyHarbin 150090China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Energy and Power Engineering Northeast Electric Power UniversityJilin 132012China

The non-uniformity of gas–liquid mixture is a critical issue which leads to the heat transfer deterioration of spiralwound heat exchangers(SWHEs).Two-phase mass flow rate and the content of gas are important parameters as well as structural parameters which have prominent influences on flow distribution uniformity of SWHE shell *** order to investigate the influences of these parameters,an experimental test system was built using water and air as mediums and a novel distributor named"tubes distributor"was *** effects of mass flow rate and the content of gas on two-phase distribution performance were analyzed,where the mass flow rate ranged from 28.4 to 171.9 kg·h-1 and the content of gas changed from 0.2 to 0.8,*** results showed that the mixture mass flow rate considerably influenced the liquid distribution than that of gas phase and the larger mass flow rate exhibited the better distribution uniformity of two-phase *** was also found that the tubes distributor had the better two-phase uniformity when the content of gas was around *** diameter played an important role in the distribution of gas phase and slit width was more significant for the uniformity of liquid phase.

关键词： Spiral-wound heat exchanger Gas–liquid mixture Multiphase flow Distribution uniformity

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Secure DRM Scheme Based on Blockchain with High Credibility

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Chinese Journal of Electronics 2018年第5期27卷 1025-1036页

作者： MA Zhaofeng HUANG weihua GAO Hongmin School of Cyberspace Security Beijing University of Posts and Telecommunications

Upon the fairness, security and flexibility problems of traditional digital rights management, we proposed a blockchain infrastructure service based DRM platform with high-level credit and security, in which we first proposed a Blockchain as a service(Baa S) architecture to decrease the complexity and difficulty of building up a blockchain-based business model, the Baa S infrastructure transparently provides easily-developed user interface to implement all core functions such as genesis block creation, consensus mechanism definition, node initialization and running, wallet management, address management,blockchain explorer et al. Then based on the Baa S infrastructure we proposed a blockchain-based DRM platform with high-level credit and security for Content provider(CP), Service provider(SP) and customers. We designed the blockchain as infrastructure service for DRM business model and provided core content rights information storage in blockchain for tamper-resistant copyrights protection from being misused, and the content consumers can use blockchain-based digital assets for content consumption payment, and the platform can help the content demandside and supply-side trading and the blockchain recorded the trade data as tamper-resistant evidence. Evaluation experiments manifests the proposed scheme is reliable and secure, and provided an efficient methodology for blockchain application business model implementation.

关键词： Blockchain infrastructure Digital rights management Tamper-resistance DRM trade

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Effects of Anti—Caries Antibodies on Lactobacillus GG in Its Fermentation and Storage Periods

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Biomedical and Environmental Sciences 2002年第2期15卷 153-165页

作者： weihua Marn.P 等 Jiangxi－OAIJointResearchInstitute Nanchang330047JiangxiChina AgriculturalResearchCenterofFinland Fin－31600Jokioinenfinland

Objective To investigate how antibodies influence the fermentation of Lactobacillus GG and how Lactobacillus GG influences the biological properties of antibodies during the fermentation and storage periods. Methods Anti-caries immune colostrum powder (IP) and control colostrum powder (CP), skimmed milk powder (SP) at concentrations of 1%, 2.5%, 5% and 10% (w/v) were added to MRS and 50mM Hepes buffer system was used in the milk, the growth curves of Lactobacillus GG including viable cells, lactic acid concentatrion and pH, and also the titer of specific antibodies were determined during the fermentation and storage periods. Results In MRS, SP could improve the growth of Lactobacillus GG in all periods of fermentation, especially at the concentrations of 5% and 10%. CP at the concentrations of 1% and 2.5% had a good initial velocity at the beginning and CP (1%, 2.5%, 5%, 10%) in all the groups could reach a high viable cell concentration at the end of fermentation, which suggested that there were some growth factors for Lactobacillus GG in CP overcoming the inhibition of unspecific antibodies. IP at 1%, 2.5%, 5% and 10% could inhibit the growth of Lactobacillus GG in all the fermentation periods, the critical concentration point was between 2.5%-5%, and there was a competition between growth factors and the inhibition of specific antibodies. In pasteurized milk, the influence of Hepes could help the fermentation start quickly and reach the log phase earlier than in the control group; however, when combined with 5% IP, the growth of Lactobacillus GG was strongly inhibited during all the fermentation periods. The fermentation of Lactobacillus GG had no significant effect on the titer change of anti-caries antibodies during the fermentation and storage periods. Conclusion SP and CP is beneficial to the growth of Lactobacillus GG in MRS, whereas there is a competition between growth factors and the inhibition of specific antibodies to the growth of Lactobacillus

关键词： Antibody Lactobacillus GG Fermentation

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Chinese urbanization 2050： SD modeling and process simulation

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Science China Earth Sciences 2017年第6期60卷 1067-1082页

作者： GU ChaoLin GUAN weihua LIU HeLin School of Architecture Tsinghua University Beijing 100084 China School of Architecture and Urban Planning Huazhong University of Science & Technology Wuhan 430074 China School of Geographical Sciences Nanjing Normal University Nanjing 210023 China

Is Chinese urbanization going to take a long time, or can its development goal be achieved by the government in a short time? What is the highest stable urbanization level that China can reach? When can China complete its urbanization? To answer these questions, this paper presents a system dynamic(SD) model of Chinese urbanization, and its validity and simulation are justified by a stock-flow test and a sensitivity analysis using real data from 1998 to 2013. Setting the initial conditions of the simulation by referring to the real data of 2013, the multi-scenario analysis from 2013 to 2050 reveals that Chinese urbanization will reach a level higher than 70% in 2035 and then proceed to a slow urbanization stage regardless of the population policy and GDP growth rate settings; in 2050, Chinese urbanization levels will reach approximately 75%, which is a stable and equilibrium level for China. Thus, it can be argued that Chinese urbanization is a long social development process that will require approximately20 years to complete and that the ultimate urbanization level will be 75–80%, which means that in the distant future, 20–25% of China's population will still settle in rural regions of China.

关键词： Chinese urbanization System dynamic (SD) model Scenario simulation

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Delay-dependent decentralized H_∞ filtering for uncertain interconnected systems

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Journal of Systems Engineering and Electronics 2008年第4期19卷 766-774页

作者： Chen Ning Gui weihua Zhang Xiaofeng School of Information Science and Engineering Central South Univ. Changsha 410083 P. R. China

This article considers delay dependent decentralized H∞ filtering for a class of uncertain interconnected systems, where the uncertainties are assumed to be time varying and satisfy the norm-bounded conditions. First, combining the Lyapunov-Krasovskii functional approach and the delay integral inequality of matrices, a sufficient condition of the existence of the robust decentralized H∞ filter is derived, which makes the error systems asymptotically stable and satisfies the H∞ norm of the transfer function from noise input to error output less than the specified up-bound on the basis of the form of uncertainties. Then, the above sufficient condition is transformed to a system of easily solvable LMIs via a series of equivalent transformation. Finally, the numerical simulation shows the efficiency of the main results.

关键词： interconnected systems H∞ filtering delay-dependent LMI.

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High resolution wide swath revisit synthetic aperture radar imaging mode and algorithm

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Journal of Systems Engineering and Electronics 2015年第2期26卷 274-281页

作者： weihua Zuo Yiming Pi Rui Min School of Electronic Engineering University of Electronic Science and Technology of China Department of Physics and Information Engineering Huaihua University

Based on the squint mode, a high resolution wide swath revisit synthetic aperture radar （SAR） imaging mode is pro- posed. The transmitting antennas are configured as the single phase center multiple azimuth beams （SPC MAB）. The formed two beams point to two different directions to obtain two images of the observed scenario. The receiving antennas are configured as displaced phase center multiple azimuth beams （DPC MAB） to decrease the required pulse repetition frequency （PRF）. The de- creased PRF can ensure the high resolution wide swath imaging. Based on the analysis of the character of the return signal, a pro- cessing method named multiple beam multiple channel algorithm （MBMCA） is proposed to separate the aliased sub-beams＇ echoes. The separated echoes are focused respectively to get the revisit imaging to the observed scenario. The simulation experiments ve- rify the validity and correctness of the proposed imaging mode and processing algorithm.

关键词： synthetic aperture radar(SAR) high resolution wide swath revisit

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