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BNX小鼠生物学特性及其应用

上海实验动物科学 2004年第1期24卷 50-54页

作者：范士明姚明邢华李厚达上海市肿瘤研究所上海200032 扬州大学比较医学中心扬州225009

本文综述了T、B和NK细胞联合免疫缺陷BNX小鼠的培育,详细介绍其一般的生物学特性及其在血液学、肿瘤学、免疫学和微生物学等方面的应用。

关键词： BNX小鼠生物学特性血液学肿瘤学免疫学微生物学

Pitting corrosion resistance of a novel duplex alloy steel in alkali-activated slag extract in the presence of chloride ions

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International Journal of Minerals,Metallurgy and Materials 2017年第10期24卷 1134-1144页

作者： Jin-jie shi Jing ming Xin Liu Jiangsu Key Laboratory of Construction Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China

In this study, two types of reinforcing steels(conventional low-carbon steel and a novel duplex alloy steel with Cr and Mo) were exposed to chloride-contaminated extract solutions(ordinary Portland cement(OPC) extract and alkali-activated slag(AAS) extract) to investigate their pitting corrosion resistance. The results confirm that the pitting corrosion resistance of the alloy steel is much higher than that of the low-carbon steel in both extract solutions with various Na Cl concentrations. Moreover, for each type of steel, the AAS extract contributes to a higher pitting corrosion resistance compared with the OPC extract in the presence of chloride ions, likely because of the formation of flocculent precipitates on the steel surface.

关键词： pitting corrosion resistance alloy steel alkali-activated slag chloride ions electrochemical impedance spectroscopy cyclic potentiodynamic polarization

Error Analysis of A New Higher Order Boundary Element Method for A Uniform Flow Passing Cylinders

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China Ocean Engineering 2023年第3期37卷 369-377页

作者： SUN shi-yan CUI Jie BAO Chao-ming School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

A higher order boundary element method(HOBEM)is presented for inviscid flow passing cylinders in bounded or unbounded *** traditional boundary integral equation is established with respect to the velocity potential and its normal *** present work,a new integral equation is derived for the tangential *** boundary is discretized into higher order elements to ensure the continuity of slope at the element *** velocity potential is also expanded with higher order shape functions,in which the unknown coefficients involve the tangential *** expansion then ensures the continuities of the velocity and the slope of the boundary at element *** extensive comparison of the results for the analytical solution of cylinders,it is shown that the present HOBEM is much more accurate than the conventional BEM.

关键词： higher order boundary element method(HOBEM) error analysis integral equations for potential and velocity cylinders

Vertical-horizontal coupling nonlinear vibration characteristics of rolling mill under mixed lubrication

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Journal of Iron and Steel Research International 2021年第5期28卷 574-585页

作者： Dong-xiao Hou Liang Xu Pei-ming shi School of Control Engineering Northeastern University at QinhuangdaoQinhuangdao 066004HebeiChina School of Electrical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

Considering the dynamic influence of the roll vibration on the lubricant film thickness in the rolling deformation area,nonlinear dynamic rolling forces related to film thickness in the vertical and horizontal directions were obtained based on the Karman balance *** on these dynamic rolling forces and the mechanical vibration of the rolling mill,a vertical-horizontal coupling nonlinear vibration dynamic model was *** amplitude-frequency equation of the main resonance was derived by using the multiple-scale *** last,the parameters of the 1780 rolling mill were used for numerical simulation,and the time-domain response curves of the system’s vibration displacement and lubricating film thickness under the steady and unsteady conditions were *** influences of parameters such as interface contact ratio,nonlinear parameters and external disturbances on the primary resonance frequency characteristics were obtained,which provided a theoretical reference for the suppression of rolling mill vibration.

关键词： Vertical-horizontal coupling Nonlinear vibration Mixed lubrication Dynamic rolling force Main resonance Amplitude-frequency characteristic

Influence of cerium treatment on inclusion modification and as-cast microstructure of high-strength low-alloy steel

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Journal of Iron and Steel Research International 2022年第10期29卷 1659-1668页

作者： Ru-ming Geng Jing Li Cheng-bin shi State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China

The influence of cerium treatment on the inclusion evolution and as-cast microstructure of high-strength low-alloy steel was *** including the inclusions characteristics,element distribution,and the in situ solidification were analyzed by scanning electron microscopy,energy-dispersive spectroscopy,and high-temperature confocal laser scanning microscopy,*** results indicated that,after the addition of Ce,the Al_(2)O_(3) inclusions evolved to form Ce_(2)O_(2)S and CeAlO_(3) inclusions,which exhibited a decrease in size alongside corresponding increase in their number *** equiaxed grain ratio exhibited by the as-cast microstructure increased significantly upon the addition of Ce,while a reduction in the segregation and a corresponding increase in the homogeneity of the carbon distribution within the as-cast microstructure were also *** results of the in situ observation of the solidification suggested that the addition of Ce significantly reduced the solidification temperature range,thus reducing the carbon *** nucleation effect imparted by Al_(2)O_(3),Ce_(2)O_(2)S,and CeAlO_(3) on theδ-Fe formation was discussed in the context of the disregistry theory,which revealed that the formation of a large number of fine Ce_(2)O_(2)S inclusions promotedδ-Fe formation via heterogeneous nucleation.

关键词： Ce treatment Non-metallic inclusion As-cast microstructure In situ observation Disregistry theory

Rylene Diimide and Dithienocyanovinylene Copolymers for Polymer Solar Cells

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Chinese Journal of Polymer Science 2017年第2期35卷 230-238页

作者： Shui-xing Dai shi-ming Zhang 凌启淡占肖卫 Fujian Key Laboratory of Polymer Materials College of Materials Science andEngineering Fujian Normal University Fuzhou 350007 China Department of Materials Science and Engineering College of Engineering Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Peking University Beijing 100871 China Key Laboratory of Flexible Electronics & Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 China

Two polymers containing （E）-2,3-bis（thiophen-2-yl）acrylonitrile （CNTVT） as a donor unit, perylene diimide （PDI） or naphthalene diimide （NDI） as an acceptor unit, are synthesized by the Stille coupling copolymerization, and used as the electron acceptors in the solution-processed organic solar cells （OSCs）. Both polymers exhibit broad absorption in the region of 300-850 nm. The LUMO energy levels of the resulted polymers are ca. -3.93 eV and the HOMO energy levels are -5.97 and -5.83 eV. In the binary blend OSCs with PTB7-Th as a donor, PDI polymer yields the power conversion efficiency （PCE） of up to 1.74%, while NDI polymer yields PCE of up to 3.80%.

关键词： Perylene diimide Naphthalene diimide Polymer solar cell Non-fullerene acceptor

Microstructure and tribological behavior of tungsten inert gas welding arc brazing tin-based babbit

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Rare Metals 2020年第2期39卷 193-199页

作者： Fang-ming Zhou Qing-Ya Zhang ming-Xiao shi Hui Li Jun-Wu Guo Jiangsu Province Key Laboratory of Advanced Welding Technology Jiangsu University of Science and TechnologyZhenjiang212003China

The microstructure of the tin-based babbit obtained by the method of tungsten inert gas welding(TIG)arc brazing was studied by optical microscopy(OM)and X-ray diffraction(XRD).Tribological behavior was investigated by high-temperature friction and wear testing machine(HTFWT),laser scanning confocal microscopy(LSCM),scanning electron microscopy(SEM)and energydispersive spectrometer(EDS).It can be found that the higher welding current of the melting tin-based babbit makes it possible to form isomer structure with fine crystals of the cubic SnSb compounds and large star Cu6Sn5 compounds so that a higher hardness can be achieved,and a lower wear rate can be obtained over the entire distance of sliding *** the applied load is 2 N,the contact surface is oxidized due to the accumulation of friction heat and oxide,which plays a role of lubricated ***,the softer Sn-based solid solution forms obvious furrow under abrasive wear,and the harder SbSn and Cu6Sn5 intermetallic compounds shatter and leave a hole under friction.

关键词： Tin-based babbit TIG arc brazing Microstructure Tribological behavior

Fast Computation of Electrostatic Interactions for a Charged Polymer with Applied Field

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Chinese Journal of Polymer Science 2020年第6期38卷 665-672页

作者： Hao Lin Zi-Tong Lei ming-ming Ding Hong-Jun Wang Tong-Fei shi School of Mathematics Jilin Normal UniversityChangchun 130103China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 730022China College of Computer Jilin Normal UniversitySi ping 136000China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026China

Using a hybrid simulation approach that combines a finite difference method with a Brownian dynamics,we investigated the motion of charged *** to the fact that polymer-solution systems often contain a large number of particles and the charged palymer chains are in a state of random motion,it is a time consuming task to calculate the electrostatic interaction of the ***,we propose a new strategy to shorten the CPU time by reducing the iteration *** simulation results ilustrate the effect of preset parameters on CPU time and accuracy,and demonstrate the feasibility of the"local iteration"***,we find that the increase in the number of charged beads has no signifiant infuence on the time of global iterations and local *** a number of 80×80×80 grids,when the relative error is controlled below 1.5%,the computational efficiency is increased by 8.7 times in the case that contains 500 charged *** adition,for a number of 100×100×100 grids with 100 charged beads,the computational efciency can be increased up to 12 *** work provides new insights for the optimization of iterative algorithms in special problems.

关键词： Finite dfference method Brownian dynamics Charged polymers Electrostatic interaction Local iteration

Analysis of lateral stability of I-section aluminum beams

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Science China(Technological Sciences) 2006年第6期49卷 742-751页

作者： CHENG ming shi Yongjiu WANG Yuanqing Department of Civil Engineering Key Laboratory of Structural Engineering and Vibration of the Ministry of Education Tsinghua University Beijing 10084 China Department of Civil Engineering Key Laboratory of Structural Engineering and Vibration of the Ministry of Education Tsinghua University Beijing 10084 China Department of Civil Engineering Key Laboratory of Structural Engineering and Vibration of the Ministry of Education Tsinghua University Beijing 10084 China

This paper focuses on the lateral buckling of laterally-unrestrained aluminum beams subjected to a concentrated, uniformly loading; pure-bending action. The design methods of lateral stability of aluminum beams in the current codes are discussed. The influence of material property on the lateral buckling of aluminum beams is investigated with finite element analysis (FEA) methods. Some numerical examples are given,; the results from current codes are compared with the FEA solutions. The design method on lateral stability of steel beams specified in the Chinese standard GB 50017-2003 is modified to calibrate the stability factors of aluminum beams according to the European code, British code,; American code,; the modified method is verified by FEA results. Through comparison with the available test results, the modified design method for overall stability of aluminum bending members is proposed in this paper; proved applicable in the design of lateral stability of aluminum beams.

关键词： aluminum bending members, lateral buckling, stability factor, finite element analysis (FEA), design method.