检索结果-南通市图书馆

Dynamically Exploring the QCD Matter at Finite Temperatures and Densities:A Short Review

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第8期38卷 23-31页

作者： Shanjin Wu chun shen Huichao Song Center for High Energy Physics Peking UniversityBeijing 100871China Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Department of Physics and Astronomy Wayne State University DetroitMichigan 48201USA RIKEN BNL Research Center Brookhaven National Laboratory UptonNew York 11973USA

We provide a concise review on recent theory advancements towards full-fledged(3+1)D dynamical descriptions of relativistic nuclear collisions at finite baryon ***-ion collisions at different collision energies produce strongly coupled matter and probe the QCD phase transition at the crossover,critical point,and first-order phase transition *** frameworks provide a quantitative tool to extract properties of hot QCD matter and map fireballs to the QCD phase *** challenges are highlighted when confronting current theoretical frameworks with current and forthcoming experimental measurements from the RHIC beam energy scan programs.

关键词： density Dynamical collision

Analysis on capabilities of density-based solvers within OpenFOAM to distinguish aerothermal variables in difusion boundary layer

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2013年第6期26卷 1370-1379页

作者： shen chun Sun Fengxian Xia Xinlin School of Energy Science and Engineering Harbin Institute of Technology School of Power and Energy Science Harbin Engineering University

Open source feld operation and manipulation（OpenFOAM）is one of the most prevalent open source computational fluid dynamics（CFD）*** is very convenient for researchers to develop their own codes based on the class library toolbox within *** recent years,several density-based solvers within OpenFOAM for supersonic/hypersonic compressible flow are coming *** the capabilities of these solvers to capture shock wave have already been verifed by some researchers,these solvers still need to be validated comprehensively as commercial CFD *** boundary layer where diffusion is the dominant transportation manner,the convective discrete schemes＇capability to capture aerothermal variables,such as temperature and heat flux,is different from each other due to their own numerical dissipative characteristics and from viewpoint of this capability,these compressible solvers within OpenFOAM can be validated *** this paper,frstly,the organizational architecture of density-based solvers within OpenFOAM is ***,from the viewpoint of the capability to capture aerothermal variables,the numerical results of several typical geometrical felds predicted by these solvers are compared with both the outcome obtained from the commercial software Fastran and the experimental *** the computing process,the Roe,AUSM＋（Advection Upstream Splitting Method）,and HLLC（Harten-Lax-van Leer-Contact）convective discrete schemes of which the spatial accuracy is 1st and 2nd order are utilized,*** compared results show that the aerothermal variables are in agreement with results generated by Fastran and the experimental data even if the1st order spatial precision is ***,the accuracy of these density-based solvers can meet the requirement of engineering and scientifc problems to capture aerothermal variables in diffusion boundary layer.

关键词： Aerothermal variables Boundary layer Computational fluid dynamics(CFD) Heat flux Open source Supersonic

Numerical and Experimental Investigation of an Axial Compressor Flow with Tandem Cascade

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2012年第6期21卷 500-508页

作者： chun shen Xiaoqing Qiang Jinfang Teng School of Aeronautics and Astronautics Shanghai Jiao Tong University Shanghai China

Basing on a prototype of DCA airfoil and axial displacement overlap of 10% chord,seven kinds of tangential displacements are taken to simulate the flow conditions in tandem cascade with numerical methods to select a better geometry with higher *** configuration with tangential displacement b/t=0.83 would gain better flow performance than the *** this basis,two configurations with tangential displacement b/t=0.67 and 0.83 among several configurations are chosen to take into experimental investigations by using TR-PIV system to capture the flow velocity *** configuration with b/t=0.83 is observed a better flow field performance than b/t=*** injection flow in the gap zone is much stronger,wake zone area of the front and rear blade is smaller and the stream flow is more *** shows that the flow performance in experimental investigation is quite in the same trend as the numerical results predict.

关键词： Compressor DCA tandem cascade Tangential displacement Numerical simulation TR-PIV

Initiation of dendritic NMDA spikes co-regulated via distance-dependent and dynamic distribution of the spine number and morphology in neuron dendrites

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第2期66卷 429-438页

作者： CAO YuWei shen chun QIU Hu GUO WanLin State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Mechanics and Control of Mechanical Structure and Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education Institute for Frontier Science and Institute of NanoscienceNanjing University of Aeronautics and AstronauticsNanjing 210016China

Dendritic spines are small membranous protrusions that receive synaptic inputs from other neurons,enabling the initiation of dendritic N-methyl-D-aspartic(NMDA)spikes and somatic action *** learning and memory processes,both the number of spines on a dendrite and the morphology of individual spines are constantly *** individual influence of spine number and morphology on dendritic NMDA spikes has already been revealed,but the functional significance of the coregulation of spine number and morphology on NMDA spikes remains ***,we systematically investigated the initiation of local dendritic NMDA spikes by the dynamic distributions of the spine number and morphology on single dendrites in reconstructed neuron *** from the traditional cognition,we found the threshold number of spines required to generate local dendrite NMDA spikes on distal dendrites is fewer than that on proximal ones,because the thinner distal dendrites own higher *** for the spine morphology,the presence of moreα-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid(AMPA)receptors on the spine leads to larger NMDA spikes rather than an increase in the spine dimension ***,we first suggested that a single dendrite containing spines with gradually increasing head diameters away from the soma could generate larger NMDA spikes than that irrational distribution of spine morphology containing spines with decreasing head diameters,which can be compensated by the increasing spine ***,the distance-dependent distribution of spine number and morphology co-regulate the intension of dendritic NMDA *** findings about the threshold for NMDA spikes provide novel insights into the role of the irrational dynamic distribution of the spine number and morphology in senescence and disease processes such as Alzheimer’s disease,schizophrenia,and Parkinson’s disease,which causes abnormal neuron firing.

关键词： dendritic spine spine number spine morphology NMDA spikes memory neurological diseases

Green synthesis and enhanced photocatalytic activity of Ce-doped TiO2 nanoparticles supported on porous glass

在线全文

学校读者我要写书评

暂无评论

Particuology 2017年第5期15卷 103-109页

作者： chun shen Kexia Pang Le Du Guangsheng Luo Beijing Key Laboratory of Bioprocess College of Life Science and Technology Beijing University of Chemical Technology Beijing 100029 China State Key Laboratory of Chemical Resource Engineering Belting Key Laboratory of Membrane Science and Technology Beijing University of Chemical Technology Beijing 100029 China State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University Beijing 100084 China

A facile and green method to prepare Ce-doped TiO2 nanoparticles supported on porous glass beads is reported. An ion exchange process and subsequent calcination yielded Ce-doped TiO2 nanoparticles with a mean size of 4.8±0.3 nm. The nanoparticles were dispersed on the surface of porous glass beads. The addition of Ce enhanced the visible light absorption of the TiO2 nanoparticles in the 400-500 nm spectral window. The band gap of the as-prepared catalyst was 2.80 eV. The Ce-doped TiO2 nanoparticles immobilized on porous glass beads exhibited excellent photocatalytic activity for the visible-light-degradation of methyl orange （MO） and rhodamine B （RhB）; with rate constants of 0.095 and 0.230 min^-1 ; respectively. The effects of Ce dosage; reaction duration; and initial solution pH on the conversion of MO and RhB dyes were investigated. The green synthesis and favorable photocatalytic activity makes the Ce-doped TiO2 nanoparticles immobilized on porous glass an attractive alternative for the efficient degradation of organic pollutants.

关键词： Ce-doped TiO2 catalystSupported nanoparticlesPorous glass beadsPhotocatalytic degradation

Ni nanoparticles supported on carbon as efficient catalysts for steam reforming of toluene(model tar)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2018年第2期26卷 322-329页

作者： chun shen Wuqing Zhou Hao Yu Le Du Beijing Key Laboratory of Bioprocess College of Life Science and TechnologyBeijing University of Chemical Technology The State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Membrane Science and TechnologyBeijing University of Chemical Technology

This paper investigated the influences of surface properties of carbon support and nickel precursors(nickel nitrate, nickel chloride and nickel acetate) on Ni nanoparticle sizes and catalytic performances for steam reforming of toluene. Treatment with nitric acid helped to increase the amount of functional groups on the surface and hydrophilic nature of carbon support, leading to a homogeneous distribution of Ni nanoparticles. The thermal decomposition products of nickel precursor also played an important role, Ni nanoparticles supported on carbon treated with acid using nickel nitrate as the precursor exhibited the smallest mean diameter of 4.5 nm. With the loading amount increased from 6 wt% to 18 wt%, the mean particle size of Ni nanoparticles varied from4.5 nm to 9.1 nm. The as-prepared catalyst showed a high catalytic activity and a good stability for toluene steam reforming: 98.1% conversion of toluene was obtained with the Ni content of 12 wt% and the S/C ratio of3, and the conversion only decreased to 92.0% after 700 min. Because of the high activity, good stability, and low cost, the as-prepared catalyst opens up new opportunities for tar removing.

关键词： Ni nanoparticles Steam reforming Tar removing Catalytic performance

Buckling of composite cylindrical shells with ovality and thickness variation subjected to hydrostatic pressure

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2022年第5期18卷 862-875页

作者： Zhun Li Ke-chun shen Xin-hu Zhang Guang Pan School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an710072China Key Laboratory for Unmanned Underwater Vehicle Northwestern Polytechnical UniversityXi'an710072China Structural Ceramics and Composites Engineering Research Center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China

The initial geometric imperfection is one of the primary factors affecting the buckling behaviors of composite cylindrical shells under hydrostatic *** this study,ovality and thickness variations as two representative types of the geometric imperfections are *** measuring the geometric imperfections,a typical carbon fiber reinforced polymers(CFRP)cylindrical shell is tested to obtain the buckling *** buckling behaviors of the shell sample are analyzed in combination with the strain *** using the nonlinear numerical analysis,the buckling shapes of the CFRP cylinder shells with different combinations of ovality and thickness variation are firstly *** rules of influence of such imperfections on the buckling pressure are then obtained by nonlinear regression ***,an empirical formula is proposed to predict the buckling pressure of the composite cylinder shells,and the calculated results from the formula are in good agreement with the numerical results.

关键词： Composite Cylindrical shell Buckling Hydrostatic pressure Imperfections

Strong electron-ion coupling in gradient halide perovskite heterojunction

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第4期14卷 1012-1017页

作者： Hongye Chen Liaoyu Wang chun shen Jiahuan Zhang Wanlin Guo State Key Laboratory of Mechanics and Control of Mechanical Structures Key Laboratory for Intelligent Nano Materials and Devices of Ministry of EducationInstitute of Nano ScienceNanjing University of Aeronautics and AstronauticsNanjing 210016China

The electron-ion coupling in iontronics has great significance and potential for energy conversion and storage ***,it is a substantial challenge to integrate iontronics into all-solid-state semiconductor circuits and explore the electron-ion coupling in semiconductor ***,by utilizing the organic-inorganic halide perovskite,we fabricate a planar heterojunction with a gradient distribution of halide *** diode-like halide migration was investigated by bias voltage induced asymmetric blue shift in photoluminescence *** pseudo-ionic diode behaviour was found to result from asymmetric charge injection characterized by I-V curves and gradient-halides-induced vacancy hopping indicated by energy dispersive spectroscopy(EDS).The planar gradient perovskite heterojunction provides a viable route for extending iontronic devices into the regime of all-solid-state semiconductors.

关键词： halide perovskite films gradient heterojunctions electron-ion couplings photoluminescence

Simulation and verification of core–shell MC carbide design in Fe–C–Ni–V–Ti steel

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2021年第1期28卷 58-65页

作者： Chen‑chong Wang chun‑guang shen Zhen Zhang Wei Xu State Key Laboratory of Rolling and Automation School of Materials Science and EngineeringNortheastern UniversityShenyang 110819LiaoningChina

Thermodynamic theory was used to calculate the formation temperature and site fraction of MC carbides in Fe–C–Ni–V–Ti *** calculation results showed the theoretical formation conditions of core–shell MC ***-step and two-step heat treatment processes were used in Fe–C–Ni–V–Ti alloy to,respectively,obtain homogeneous and core–shell MC carbides,which was consistent with the thermodynamic calculation *** transmission electron microscopy observations showed that the core–shell MC carbide obtained by the two-step heat treatment process contained homogeneous(Ti,V)C as the core and basically VC as the *** mechanical test results proved that compared with homogeneous MC carbides,core–shell MC carbides could improve the basic mechanical properties of the alloy because VC shell greatly increased the bonding strength and separation work of Fe/MC ***,the core–shell MC carbide with a VC shell structure can be a better grain refiner and can be used in steels with a high standard of fracture toughness.

关键词： Core–shell carbide Thermodynamic calculation Microstructure observation Grain refiner Mechanical