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Journal of Hydrodynamics 2022年第3期34卷 408-421页

作者： Ming-Kang Li Shuai Zhang Yu-xiang peng A-Man Zhang College of Shipbuilding Engineering Harbin Engineering UniversityHarbin150001China Nanhai Institute of Harbin Engineering University Sanya572024China School of Marine Engineering and Technology Sun Yat-sen UniversityZhuhai519082China

The collapse of a cavitation bubble is an interesting topic and it has many applications in the engineering *** to its compressible nature,the modelling of a cavitation bubble is not easy by the Lagrangian method,like the smoothed particle hydrodynamics(SPH),as there is large variation of particle ***,there are two kinds of method that have been proposed to deal with this problem:the particle regeneration technique(PRT)and the volume adaptive scheme(VAS).They have all been validated via several numerical tests of compressible flow in the past *** is based on totally different concept,the ultimate simulation results and properties may ***,we intend to compare these two methods based on the Riemann-based SPH solver with monotone upwind-centered scheme for conservation laws(MUSCL)reconstruction via several numerical *** characteristics of these two methods are discussed and the applicable scope for them are also commented for further usage.

关键词： Compressible flow smoothed particle hydrodynamics(SPH) particle regeneration technique(PRT) volume adaptive scheme(VAS)

High retention volume covalent organic polymer for xenon capture:Dynamic separation of Xe and Kr

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Green Energy & Environment 2022年第5期7卷 948-956页

作者： Qian Wang Zhu Meng Juntao Li Shuming peng Zhonghua xiang Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyangSichuan621900China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China Department of Chemistry Imperial College London20 Gordon StreetLondonWC1H0AJUK Department of Chemistry University College LondonLondonW120BZUK

Xenon capture and Xe/Kr separation are important processes in *** instance,Xe/Kr separation is an indispensable step in recycle and treatment of nuclear fuel *** different separation methods,selectively adsorb gas molecules using porous materials is a promising way to reduce the high energy consumption in traditional cryogenic ***,many reported adsorbents still face the challenges of:ⅰ) poor separation property at low Xe/Kr concentrations;ⅱ) insufficient retention volumes,which influence the viability of whole *** this work,we present a stable covalent organic polymer,i.e.,COP-14,showing promising potential for Xe/Kr *** dynamic breakthrough experiments,COP-14 successfully separates low concentration Xe(350 ppm) and Kr(35 ppm) from target gas ***,the xenon retention volume per gram(1700 mL g^(-1) at 298 K) of COP-14 in dynamics absorption process achieves 3.8 times of benchmark active *** good performance of the newly devloped COP-14 mainly from its rich nitrogen sites and suitable pore size with xenon *** promising results of COP-14 on Xe/Kr separation in this work provide a promising way for designing efficient Xe/Kr separation mateirals.

关键词： process separation retention

Pseudo-dynamic tests on masonry residential buildings seismically retrofitted by precast steel reinforced concrete walls

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Earthquake Engineering and Engineering Vibration 2017年第3期16卷 587-597页

作者： Li Wenfeng Wang Tao Chen Xi Zhong xiang Pan peng Beijing Institute of Architectural Design Beijing 100045 China Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake Administration Sanhe 065201 China Department of Civil Engineering Tsinghua University Beijing 100084 China

A retrofitting technology using precast steel reinforced concrete（PSRC） panels is developed to improve the seismic performance of old masonry buildings. The PSRC panels are built up as an external PSRC wall system surrounding the existing masonry building. The PSRC walls are well connected to the existing masonry building, which provides enough confinement to effectively improve the ductility, strength, and stiffenss of old masonry structures. The PSRC panels are prefabricated in a factory, significantly reducing the situ work and associated construction time. To demonstrate the feasibility and mechanical effectivenss of the proposed retrofitting system, a full-scale five-story specimen was constructed. The retrofitting process was completed within five weeks with very limited indoor operation. The specimen was then tested in the lateral direction, which could potentially suffer sigifnicant damage in a large earthquake. The technical feasibility, construction workability, and seismic performance were thoroughly demonstrated by a full-scale specimen construction and pseudo-dynamic tests.

关键词： masonry buildings precast SRC panel seismic retrofit pseudo-dynamic test seismic performance

Plastic deformation and heat treatment of Mg-Li alloys:a review

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Journal of Materials Science & Technology 2022年第4期99卷 193-206页

作者： xiang peng Wencai Liu Guohua Wu Hao Ji Wenjiang Ding National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

As the lightest structural metallic materials,Mg-Li alloys have a bright development prospect in the fields of aerospace,weapon equipment,electronic technology and *** this paper,the research progress of deformation processing and heat treatment of Mg-Li alloys is reviewed,with particular emphasis on the factors affecting the plastic deformation,the effects of plastic deformation on microstructural evolution and mechanical properties,and the heat treatment behavior of Mg-Li *** problems existing in the scale application of Mg-Li alloys are pointed out,and the research focus of Mg-Li alloys in the future are also prospected.

关键词： Mg-Li alloy Plastic deformation Heat treatment Aging softening Research progress

Permissible Minimum Thickness in Asymmetrical Cold Rolling

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Journal of Iron and Steel Research International 2013年第11期20卷 21-26页

作者： TANG De-lin LIU xiang-hua LI xiang-yu peng Liang-gui State Key Laboratory of Rolling and Automation Laboratory Northeastern University

The minimum rolling thickness in asymmetrical rolling was analyzed compared with that in symmetrical rolling. The differential equilibrium equations on forces were established to calculate the asymmetrical rolling force equation by slab method. An implicit expression of the minimum rolling thickness was then derived from the rolling force equation and Hitehcock equation. The results show that permissible minimum rolling thickness of asymmetrical rolling only exists within a specific range of cross-shear ratio, which is termed the cross-shear zone proportion of the whole de- formation zone. Numerical computation was carried out to obtain a discrete solution of the minimum rolling thick- ness. Experiments were designed to investigate the influence factors on cross-shear ratio. Finally, experimental re- sults prove the correctness of the improved formula given.

关键词： asymmetrical roiling minimum permissible thickness cross-shear ratio asymmetrical ratio friction peak value

Recent progresses on improving CO_(2)adsorption and proton production for enhancing efficiency of photocatalytic CO_(2)reduction by H_(2)O

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Green Chemical Engineering 2020年第1期1卷 33-39页

作者： peng Liu Xingcui peng Yu-Long Men Yun-xiang Pan Dept.of Instrument Science and Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai200240PR China Dept.of Chemical Engineering School of Chemistry and Chemical EngineeringState Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai200240PR China

Photocatalytically reducing CO_(2)by H_(2)O into valuable carbon-containing chemicals is one of the greatest concerns for both scientific and industrial communities,due to its great potential in solving energy and environmental ***,the photocatalytic reduction efficiency is still much lower than the need of large-scale ap*** of photocatalysts in adsorbing CO_(2)and splitting H_(2)O to produce protons are crucial factors determining the photocatalytic reduction *** research efforts have been devoted to addressing the issues on CO_(2)adsorption and proton *** present review discusses the recent progresses in improving CO_(2)adsorption and proton production on photocatalysts for increasing the photocatalytic reduction *** research opportunities and challenges are also *** is hoped that the present review can stimulate more deep insights on adsorption of CO_(2)and production of proton for increasing the photocatalytic reduction efficiency。

关键词： Carbon dioxide Photocatalysis Adsorption of carbon dioxide Production of proton Water splitting

A new perspective in pyroptosis:lifting the veil on GSDMA activation

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Frontiers of Medicine 2023年第3期17卷 581-583页

作者： Pian Yu xiang Chen Cong peng Department of Dermatology Xiangya HospitalCentral South UniversityChangsha 410008China National Clinical Research Center for Geriatric Disorders Xiangya HospitalChangsha 410008China Hunan Key Laboratory of Skin Cancer and Psoriasis Xiangya HospitalChangsha 410008China Hunan Engineering Research Center of Skin Health and Disease Xiangya HospitalChangsha 410008China xiangya Clinical Research Center for Cancer Immunotherapy Central South UniversityChangsha 410008China

Pyroptosis is an inflammatory form of death mediated by gasdermin that recruits immune cells to the site of infection and promotes protective *** gasdermin is a family of pore-forming proteins,including GSDMA(Gsdma1,Gsdma2,Gsdma3),GSDMB,GSDMC(Gsdmc1,Gsdmc2,Gsdmc3,Gsdmc4),GSDMD(Gsdmd),GSDME/DFNA5(Dfna5)and GSDMF/DFNB59/PJVK(Dfnb59)[1,2].Though activation of GSDMB/C/D/E has been gradually illustrated[3],the details of GSDMA activation,particular in epithelial cells such as skin and upper gastrointestinal tract,still remain so far largely elusive.

关键词： protective activation lifting

Adaptive Backstepping Control for Hypersonic Vehicles with Actuator Amplitude and Rate Saturation

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第2期36卷 242-252页

作者： xiang Kai DU Yanli ZHANG peng LIN Haibing College of Astronautics Nanjing University of Aeronautics and Astronautics

This paper presents a constrained control strategy for the hypersonic vehicle with actuator amplitude,rate constraints and aerodynamic ***,a vehicle-actuator control model is derived in consideration of actuator dynamics properties ***,a nonlinear disturbance observer is designed to estimate the aerodynamic uncertainties,and then an adaptive backstepping control technique is adopted with a modified first-order-filter to eliminate the“explosion of terms”***,for handling the actuator amplitude and rate constraints,a novel auxiliary compensation system is constructed to generate quickly compensating signals to ensure tracking performance of command *** the Lyapunov stability proof,the proposed control scheme can enssure that the tracking errors converge to an arbitrarily small neighborhood around zero when the actuator constraints and aerodynamic uncertainties ***,numerical simulations are implemented to illustrate the effectiveness of the proposed control method.

关键词： hypersonic vehicle amplitude and rate saturation adaptive backstepping aerodynamic uncertainty

Rapid Finite Element Analysis of Bulk Metal Forming Process Based on Deformation Theory

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Journal of Iron and Steel Research International 2009年第5期16卷 23-28,42页

作者： WANG peng DONG xiang-huai FU Li-jun Department of Plasticity Technology Shanghai Jiao Tong University Shanghai 200030 China

The one-step finite element method （FEM）, based on plastic deformation theory, has been widely used to simulate sheet metal forming processes, but its application in bulk metal forming simulation has been seldom investigated, because of the complexity involved. Thus, a bulk metal forming process was analyzed using a rapid FEM based on deformation theory. The material was assumed to be rigid-plastic and strain-hardened. The constitutive relationship between stress and total strain was adopted, whereas the incompressible condition was enforced by penalty function. The geometrical non-linearity in large plastic deformation was taken into consideration. Furthermore, the force boundary condition was treated by a simplified equivalent approach, considering the contact history. Based on constraint variational principle, the deformation FEM was proposed. The one-step forward simulation of axisymmettic upsetting process was performed using this method. The results were compared with those obtained by the traditional incremental FEM to verify the feasibility of the proposed method.

关键词： bulk metal forming finite element method (FEM) deformation theory rapid simulation

Probe Selection for Over-the-Air Test in 5G Base Stations with Massive Multiple-Input Multiple-Output

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China Communications 2019年第7期16卷 1-12页

作者： xiang Zhang Shangbin Qiao Mugen peng Yong Li China Academy of Information and Telecommunications Technology (CAICT) Beijing 100191 China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and 0Telecommunications Beijing 100876 China

In 5G systems, massive multiple-input multiple-output (MIMO) has been adopted in base stations (BSs) to improve spectral efficiency and coverage. The traditional conductive performance test techniques are challenging due to the unaffordable cost and high complexity when testing a large number of antennas. To solve this problem, the over-the-air (OTA) test has been presented, in which probe selection is the key to reduce the number of channel emulators and probes. In this paper, a novel artificial bee colony (ABC) algorithm is introduced to enhance the efficiency and accuracy of probe selection procedure. A sectoring- based multi-probe anechoic chamber (MPAC) is built to evaluate the throughput performance of massive MIMO equipped in 5G BS. In addition, link level simulation is carried out to evaluate the proposal’s performance gain under the commercial network assumptions, where the average throughput of three velocity is given with different SNR region. The results suggest that OTA chamber and multi-probe wall are available not only for 5G BSs, but also for user equipments (UEs) with end-to-end communication.

关键词： anechoic chamber massive MIMO base stations over-the-air test probe selection performance evaluation