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Numerical investigation and design of thin-walled complex section steel columns

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第2期12卷 131-138页

作者： su-qing HUANG Ju CHEN Wei-liang JIN Department of Civil Engineering Zhejiang College of Construction Hangzhou 311200 China Department of Civil Engineering Zhejiang University Hangzhou 310058 China

A numerical investigation of thin-walled complex section steel columns with intermediate stiffeners was performed using finite element analysis. An accurate and reliable finite element model was developed and verified against test results. Veri-fication indicates that the model could predict the ultimate strengths and failure modes of the tested columns with reasonable accuracy. Therefore,the developed model was used for the parametric study. In addition,the effect of geometric imperfection on column ultimate strength and the effect of boundary conditions on the elastic distortional buckling of complex section columns were investigated. An equation for the elastic distortional buckling load of fixed-ended columns having different column lengths was proposed. The elastic distortional buckling load obtained from the proposed equation was used in the direct strength method to calculate the column ultimate strength. Generally,it is shown that the proposed design equation conservatively predicted the ultimate strengths of complex section columns with different column lengths.

关键词： Complex section column Distortional buckling Finite element method (FEM) Intermediate stiffener

Nothing but the facts: a journey together

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Zoological Research 2020年第1期41卷 1-2页

作者： su-qing Liu Zoological Research Kunming Institute of Zoology Chinese Academy of Sciences

Peer review plays an essential role in academic quality control of scientific journals and is central to scholarly *** exists in many aspects of academia,including funding applicati ons,career buildi ng,academic performa nee evaluation,and publish!*** regard to publishing,different forms of publication,from traditional hardcopies and orvline journals to preprint articles(e.g.,arXiv:https://***/,BioRxiv:https://***/),continue to fine-tune the requirements of peer review,and vice versa,peer review continuously refines the quality of publications.

关键词： academic arXiv continue

Quantum Radiative Correction on the Mass of Electron in a Cavity

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Chinese Physics Letters 1997年第1期14卷 9-12页

作者： NI Guang-jiong CHEN su-qing Department of Physics Fudan UniversityShanghai 200433

When an electron is moving through a cavity,its mass is modified due to the boundary effect on the virtual *** shift of self energy is calculated at the one loop level by means of Plana formula to yield analytical res... 详细信息

关键词： Electron boundary moving

High-Precision Direct Method for the Radiative Transfer Problems

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Communications in Theoretical Physics 2013年第6期59卷 782-788页

作者： ZHANG Yan HOU su-qing YANG Ping WU Kai-su Beijing University of Chemical Technology Beijing 100029 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049 China

It is the main aim of this paper to investigate the numerical methods of the radiative transfer equation. Using the five-point formula to approximate the differential part and the Simpson formula to substitute for integral part respectively, a new high-precision numerical scheme, which has 4-order local truncation error, is obtained. subsequently, a numerical example for radiative transfer equation is carried out, and the calculation results show that the new numerical scheme is more accurate.

关键词： radiative transfer equation direct method five-point numerical formula truncation error

Relative importance of climatic and edaphic factors as drivers of plantδ^(15)N along a longitudinal transect

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Ecosystem Health and sustainability 2022年第1期8卷 94-108页

作者： Xianzhao Liu Tianhao Wang and qing su School of Geosciences and Spatial Information Hunan University of Science and TechnologyXiangtanHunanChina

Many studies have shown that climatic and edaphic factors influence the variations in nitrogen isotopes(δ^(15)N)in terrestrial ***,the relative importance of co-varying climatic and edaphic controls on plantδ^(15)N remains somewhat *** address this issue,regional-scale plant(***)and soil samples were collected along a longitudinal transect across the temperate grasslands in northern *** influences of climatic and edaphic factors on the plantδ^(15)N were disentangled using the variable importance in projection(VIP)*** found that the climatic and edaphic variables explained 52.4%and 31.2%,respectively,of the variation in plantδ^(15)*** mean annual precipitation(MAP),soil N,and mean annual temperature(MAT)were the most important variables,but the soil water content(SWC),aridity index(AI),and soil clay content were also important *** soil pH and soil C:N ratios were identified as unimportant ***,a high-performance model for simulating plantδ^(15)N values was constructed based on the important variables(VIP>0.8).Further investigations should focus on the effects of the interaction between the climatic and edaphic variables on the N cycles in the temperate grasslands to provide more reliable predictions of plantδ^(15)N.

关键词： Relative importance nitrogen isotopes climatic variables edaphic variables L.chinensis

A natural component as initiator for photopolymerization of 1,6-hexanedioldiacrylate

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Chinese Chemical Letters 2007年第6期18卷 750-753页

作者： su qing Shi Hong Gao Jun Nie Key Laboratory of Biomedical Polymers of Ministry of Education Department of ChemistryWuhan UniversityWuhan 430072China State Key Laboratory of Chemical Resource Engineering and College of Material Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

1,3-Benzodioxole (BDO) as a simple model compound for the BDO derivatives from natural plant was used as coinitiator for p-chlorobenzophenone (CBP) and initiator for UV photopolymerization of 1,6-hexanedioldiacrylate (HDDA), respectively. The results showed that, BDO was an effective coinitiator for CBP. Although BDO as initiator led to very low rate of polymerization, it was still meaningful for the photocuring field.

关键词： 1,3-Benzodioxole Coinitiator Initiator Photopolymerization FTIR

Cross-Shock Electrostatic Potential and Ion Reflection in Quasi-Parallel supercritical Collisionless Shocks

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Chinese Physics Letters 2012年第8期29卷 318-321页

作者： su Yan-qing LU Quan-Ming CAS Key Laboratory of Basic Plasma Physics Department of Geophysics and Planetary ScienceUniversity of Science and Technology of ChinaHefei 230026 State Key Laboratory of Space Weather Chinese Academy of SciencesBeijing 100190

The time evolution of the cross-shock electrostatic potential jump during one specific high Mach number quasi-parallel shock reformation cycle is examined via a 1D hybrid *** is shown that when the average value of the electrostatic potential jump is low,its instant value can be large so that the shock is in a favorable profile to directly reflect the incident *** simulation also suggests that,for the ones that finally become injected ions(which can be further accelerated by diffusive shock acceleration mechanism),the first step of their reflections should be mainly attributed to the electrostatic potential jump,instead of the magnetic force,as stated in some previous studies.

关键词： electrostatic shock stated

Synthesis, Structure and Luminescent Property of a Zinc(Ⅱ) Coordination Polymer Incorporating Flexible Cyclohexane-1,2,3,4,5,6-hexacarboxylate Ligand

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Chemical Research in Chinese Universities 2011年第3期27卷 354-357页

作者： WANG jind LIU Zhao-qing su Ting-ting School of Chemistry and Chemical Engineering Guangzhou University Guangzhou 510006 P. R. China

The hydrothermal reaction of Zn（NO3）2·4H2O, cyclohexane-1,2,3,4,5,6-hexacarboxylic acid hydrate （H6LI·H2O, cis-conformation LI： a,e,a,e,a,e） and 2,2＇-bpy yielded a new coordination polymer [Zn2（H2LII）（2,2＇-bpy）]·2H2O（trans-conformation LII： e,e,e,e,e,e）, which was characterized by single-crystal X-ray diffraction, elemental analysis, IR and XRPD（X-ray powder diffraction）. This complex crystallized in the triclinic system, with P1 space group and parameters a=0.66922（5） nm, b=0.97291（8） nm, c=1.22184（9） nm, α=99.0020（10）°, β=99.1300（10）°, γ=99.1910（10）°, V= 0.76176（10） nm3 and Z=2. The structure is a three-dimensional supramolecular network based on linear coordination chains through π-π stacking and hydrogen bonding interactions. The confromation of the starting ligand H6LI transfromed to the H2LII. The complex emits strong luminescence at room temperature.

关键词： Coordination polymer Cyclohexane-1 2 3 4 5 6-hexacarboxylate Conformation Luminescent property

Electrostatic force of dust deposition originating from contact between particles and photovoltaic glass

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Chinese Physics B 2021年第10期30卷 267-273页

作者： Xing-Cai Li Juan Wang Guo-qing su School of Physics and Electronic-Electrical Engineering Ningxia UniversityYinchuan 750021China Ningxia Key Laboratory of Intelligent Sensing&Desert Information Ningxia UniversityYinchuan 750021China Xinhua College of Ningxia University Yinchuan 750021China

Charged photovoltaic glass produces an electrostatic *** electrostatic field exerts an electrostatic force on dust particles,thus making more dust particles deposited on the *** this paper,the contact electrification between the deposited dust particles and the photovoltaic glass is ***,the surface charge density model of the photovoltaic glass and the electrostatic force of charged particles are *** results show that with the increasing of the particle impact speed and the inclination angle of the photovoltaic panel,the charges on particles increase to different *** a given condition,the electrostatic forces acting on the charged particles at different positions above the glass plate form a bell-shaped distribution at a macro level,and present a maximum value in the center of the *** the distance between the particle and the charged glass decreases,the electrostatic force exerted on the particle increases significantly and fluctuates ***,its mean value is still higher than the force caused by gravity and the adhesion force,reported by some ***,we suggest that photovoltaic glass panels used in the severe wind-sand environment should be made of an anti-static transparent material,which can lessen the dust particles accumulated on the panels.

关键词： particle electrification electrostatic force photovoltaic glass dust deposition