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Fundamental influence of irreversible stress-strain properties in solids on the validity of the ramp loading method

Matter and Radiation at Extremes 2024年第6期9卷 94-104页

作者： Jingxiang Shen wei kang Center for Applied Physics and Technology and College of EngineeringPeking UniversityBeijing 100871China

The widely used quasi-isentropic ramp loading technique relies heavily on back-calculation methods that convert the measured free-surface velocity profiles to the stress-density states inside the compressed *** back-calculation methods are based on one-dimensional isentropic hydrodynamic equations,which assume a well-defined functional relationship P(p)between the longitudinal stress and density throughout the entire flow ***,this kind of idealized stress-density relation does not hold in general,because of the complexities introduced by structural phase transitions and/or elastic-plastic *** and to what extent these standard back-calculation methods may be affected by such inherent complexities is still an unsettled ***,we present a close examination using large-scale molecular dynamics(MD)simulations that include the detailed physics of the irreversibly compressed solid *** back-calculate the stress-density relation from the MD-simulated rear surface velocity profiles and compare it directly against the stress-density trajectories measured from the MD simulation *** exist in the cases studied here,and these turn out to be related to the irreversibility between compression and *** and compression waves are observed to propagate with different sound velocities in some parts of the flow field,violating the basic assumption of isentropic hydrodynamic models and thus leading to systematic back-calculation *** particular,the step-like feature of the P(p)curve corresponding to phase transition may be completely missed owing to these *** kind of mismatch between inherent properties of matter and the basic assumptions of isentropic hydrodynamics has a fundamental influence on how the ramp loading method can be applied.

关键词： field. irreversible solids

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Identification of a marine woloszynskioid dinoflagellate Biecheleriopsis adriatica and germination of its cysts from southern Chinese coasts

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Journal of Environmental Sciences 2018年第4期30卷 246-254页

作者： wei kang Zhao-Hui Wang Key and Open Laboratory of Marina and Estuary Fisheries Ministry of Agriculture of China East China Sea Fisheries Research InstituteChinese Academy of Fishery Sciences College of Life Science and Technology Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education InstitutesJinan University Engineering Research Center of Tropical and Subtropical Aquatic Ecological Engineering Ministry of Education

A strain of small-sized dinoflagellates, isolated from the culture of sediment incubation collected from the coastal areas in southern China, has been identified under microscopical observation and r DNA sequence. Surface sediments from two sea areas in the southern Chinese coastal waters were incubated for 20 and 40 days, and germinated vegetative cells were observed. The cells were identified as species in the Suessiaceae based on the morphological characteristics, ultrastructural features of the cell, as well as its swimming behavior. The studied strain clusters into a well-supported clade together with six sequences of Biecheleriopsis adriatica in the phylogenetic tree based on the large subunit（LSU） rDNA sequence. Therefore, the strain has been identified as B. adriatica based on morphological observation and phylogenetic analysis. B. adriatica was the dominant dinoflagellate species in the germinated phytoplankton community from both sea areas,which contributed 50%–83% to the total germinated dinoflagellates averagely. However,B. adriatica has not been reported in previous phytoplankton surveys, and was probably ignored or misidentified due to its small size and thin wall. The frequent and abundant occurrence of B. adriatica in the germinated phytoplankton community of many sea areas of the southern Chinese coastal waters suggests its wide and abundant distribution in these sea areas.

关键词： Biecheleriopsis adriatica Cyst Germination Phylogeny Southern China

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Deformation, failure and removal mechanisms of thin film structures in abrasive machining

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Advances in Manufacturing 2017年第1期5卷 1-19页

作者： Cheng-wei kang Han Huang School of Mechanical and Mining Engineering TheUniversity of Queensland Brisbane QLD 4072 Australia

Thin film structures are becoming increasingly more important for industrial applications such as the making of solar panels, microelectronic devices and micro systems. However, the challenges encountered in the machining of thin film structures have been a bottleneck that impedes further wide spread uses of such structures. The development of material removal processes that are capable of producing a damage free surface at high removal rates is critical for cost effective production. Such development relies highly on a comprehensive understanding of the deformation, failure and removal mechanisms of thin film structures involved in mechanical loading. In this paper, the current understanding of the deformation characteristics of thin film systems was reviewed to provide important insights into the interracial failure under mechanical loading, with focuses on the interfacial failure mechanisms and existing problems in the machining of thin film structures. The key characterization techniques were outlined. In particular, the recent progress in the abrasive machining of a thin film multilayer structure was summarized. The potential research directions were also presented in the end of the review.

关键词： Abrasive machining Thin film Bilayer Multilayer Interface Deformation Failure

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Inhibition of different types of inert dust on aluminum powder explosion

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Chinese Journal of Chemical Engineering 2020年第7期28卷 1941-1949页

作者： Linlin Dai Lin Hao wei kang wei Xu Ning Shi Hongyuanwei School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Institute of Qingdao Safety Engineering China Petroleum&Chemical CorporationQingdao 266000China

Aluminum powder explosion accidents occurred frequently,but the mechanism of aluminum powder explosion is ***,the inhibitive effect of aluminum powder explosion plays a key *** evaluate the inhibition capacity of different kinds of carbonates and phosphates:Na H2PO4,(NH4)2HPO4,NH4H2PO4,KHCO3 and Na HCO3 on aluminum deflagrations,a standard 20-L spherical chamber was used to determine the explosion severity,characterized by the maximum explosion pressure(Pmax).New parameters have been proposed:the minimum significant inert concentration(MSIC)and the minimum complete inert concentration(MCIC),which characterized the effect of *** results showed that from the minimum significant inert concentration(MSIC)and the minimum complete inert concentration(MCIC),phosphate can have a significant inhibiting effect.40%Na H2PO4 can totally inert the aluminum explosion,and 50%(NH4)2HPO4or 50%NH4H2PO4 can also suppress the *** simulation,phosphate mainly acts via a chemical inhibition pathway,which inhibits the reaction of aluminum powder and oxygen by catalyzing the recombination of H atoms and O *** performs inhibition in chemically,producing CO2,diluting the oxygen around the aluminum *** indicated that the explosion pressure of the mixture decreases as the concentration of inert dust ***,when the concentration of carbonates was low,SEEP(suppressant enhanced explosion parameter)phenomenon was *** research work has a potential industrial application in high hazard aluminum working condition,which can help decrease the explosion pressure and reduce the accident loss.

关键词： Aluminum dust explosion Inert Carbonate Phosphate Maximum explosion pressure

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Rational design of heterogeneous catalysts by breaking and rebuilding scaling relations

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Chinese Journal of Chemical Engineering 2022年第1期35卷 22-28页

作者： wei-Qi Yan Yi-An Zhu Xing-Gui Zhou wei-kang Yuan State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Various scaling relations have long been established in the field of heterogeneous catalysis,but the resultant volcano curves inherently limit the catalytic performance of catalyst *** the other hand,it is still very challenging to develop universal descriptors that can be used in various types of catalysts and reaction *** these reasons,several strategies have recently been proposed to break and rebuild scaling relations to go beyond the top of *** this review,some previously proposed descriptors have been briefly ***,the strategies for breaking known and establishing new and more generalized scaling relations in complex catalytic systems have been ***,the application of machine-learning techniques in identifying universal descriptors for future computational design and high-throughput screening of heterogeneous catalysts has been discussed.

关键词： Density functional theory(DFT) Heterogeneous catalysis Microkinetic analysis Scaling relations

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State of the art of bioimplants manufacturing： part II

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Advances in Manufacturing 2018年第1期6卷 137-154页

作者： Cheng-wei kang Feng-Zhou Fang Centre of MicroNano Manufacturing Technology (MNMT- Dublin) University College Dublin Belfield Ireland State Key Laboratory of Precision Measuring Technology & Instruments Centre of MicroNano Manufacturing Technology Tianjin University Tianjin 300072 People's Republic of China

The manufacturing of bioimplants not only involves selecting proper biomaterials with satisfactory bulk physicochemical properties, but also requires special treatments on surface chemistry or topography to direct a desired host response. The lifespan of a bioimplant is also critically restricted by its surface properties. Therefore, developing proper surface treatment technologies has become one of the research focuses in biomedical engineering. This paper covers the recent progress of surface treatment of bioimplants from the aspects of coating and topography modification. Pros and cons of various tech- nologies are discussed with the aim of providing the most suitable method to be applied for different biomedical products. Relevant techniques to evaluate wear, corrosion and other surface properties are also reviewed.

关键词： Bioimplant Precision manufacturing Surfacetreatment Evaluation

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weighted Estimates for Multilinear Pseudodifferential Operators

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Acta Mathematica Sinica,English Series 2014年第8期30卷 1281-1288页

作者： kang wei LI Wen Chang SUN School of Mathematical Sciences and LPMC Nankai University

In this paper,we study the weighted estimates for multilinear pseudodifferential *** show that a multilinear pseudodifferential operator is bounded with respect to multiple weights whenever its symbol satisfies some s... 详细信息

关键词： Multiple weights nmltilinear pseudodifferential operators

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Properties of doped ZnO transparent conductive thin films deposited by RF magnetron sputtering using a series of high quality ceramic targets

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Rare Metals 2008年第1期27卷 32-35页

作者： LIN wei MA Ruixin SHAO wei kang Bo WU Zhongliang Department of Nonferrous Metallurgy University of Science and Technology Beijing Beijing 100083 China

To obtain high transmittance and low resistivity ZnO transparent conductive thin films,a series of ZnO ceramic targets（ZnO：Al,ZnO：（Al,Dy）,ZnO：（Al,Gd）,ZnO：（Al,Zr）,ZnO：（Al,Nb）,and ZnO：（Al,W）） were fabricated and used to deposit thin films onto glass substrates by radio frequency（RF） magnetron sputtering.X-ray diffraction（XRD） analysis shows that the films are polycrystalline fitting well with hexagonal wurtzite structure and have a preferred orientation of the（002） *** transmittance of above 86% as well as the lowest resistivity of 8.43 × 10^-3 Ω·cm was obtained.

关键词： ZnO transparent conductive thin film RF magnetron sputtering optical properties electrical properties

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An adaptive fuzzy filter for coding artifacts removal in video and image

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第6期8卷 841-848页

作者： WU Jing YE Xiu-qing GU wei-kang Department of Information and Communication Engineering Zhejiang University Hangzhou 310027 China

This paper proposes a new adaptive post-filtering algorithm to remove coding artifacts in block-based video coder. The proposed method concentrates on blocking and ringing artifacts removal. For de-blocking, the blocking strength is identified to determine the filtering range, and the maximum quantization parameter of the image is used to adapt the 1D fuzzy filter. For de-ringing, besides the edge detection, a complementary ringing detection method is proposed to locate the neglected ringing blocks, and the gradient threshold is adopted to adjust the parameter of 2D fuzzy filter. Experiments are performed on the MPEG-4 sequences. Compared with other methods, the proposed one achieves better detail preservation and artifacts removal performance with lower computational cost.

关键词： Adaptive fuzzy filter Blocking artifacts Ringing artifacts De-blocking De-ringing

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Clustering in nuclei:progress and perspectives

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Nuclear Science and Techniques 2024年第12期35卷 343-375页

作者： kang wei Yan‑Lin Ye Zai‑Hong Yang School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China

Nucleus is essentially composed of protons and neutrons,which are commonly known as ***,some of nucleons may group together and exhibit collective behavior inside a *** clustering efects have been known since the early stages of nuclear physics because of the observation and description ofα-cluster decay from many heavy *** studies demonstrated that cluster structures exist in many nuclear systems,especially in weakly bound or excited states,and are complementary to the shell-like *** this review article,we provide a brief historical recall of the feld,and follow it with a conceptual and logical description of the major theoretical models that have been frequently applied in the literature to describe nuclear *** methods and progress are outlined,recent outcomes are emphasized,and perspectives relevant to future studies of heavy neutron-rich systems are discussed.

关键词： Nuclear matter Cluster structure Wave-packet presentation Molecular bond Condensation confguration

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