检索结果-南通市图书馆

Load-carrying capacity and practical calculation method for hollow cylinder joints connected with H-shaped beams

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第3期13卷 174-181页

作者： Hui WU Bo-qing gao Qiang CHEN Finance and Economics of Zhejiang College Hangzhou 310018 China College of Civil Engineering and Architecture Zhejiang University Hangzhou 310058 China

A type of hollow cylinder joints connected with H-shaped beams is proposed for spatial structures. Based on von Mises yield criterion and perfect elasto-plasticity model, a series of finite element models of the joints is established, in which the effect of geometric nonlinearity is taken into account. Then mechanical behavior and load-carrying capacity of the joints were investigated, which were subjected to axial load, in- and out-plane bending moments, and their combinations. The results show that the ultimate loads of the joints are determined by the maximum displacement. Furthermore, the case of one joint connected with multiple beams was discussed. Experiments on a set of typical full-scale joints were conducted to understand the structural behavior and the failure mechanism of joint, and also to validate the finite element models. Finally, the practical calculation method was established through finite elements analysis (FEA) results and numerical fitting. The results show that the joints are more ductile and materially economical than welded hollow spherical joints, and the practical calculation method can provide a reference for direct design and the revision of relevant design codes.

关键词： Hollow cylinder joints H-shaped beams Load-carrying capacity Finite elements analysis (FEA) Practical calcu-lation method

THE PROBABILITY STABILITY OF VISCOELASTIC PLATES

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2002年第2期15卷 182-188页

作者： Li Yinghui gao qing SW Jiaotong Univ Dept Appl Mech & Engn Chengdu 610031 Peoples R China

The almost sure stability of homogeneous viscoelastic platessubjected to a random wide-band stationary in-plane load isinvestigated. The viscoelastic behavior of the plate is described interms of the Bo- ltzmann superposition principle, the relaxationkernels of which are represented by the sums of exponents. On theassumption that the in-plane load is random wide-band stationaryprocess, sufficient conditions for al- Most sure stability ofviscoelastic plates are obtained by the applications of Lyapunov'sdirect method.

关键词： almost sure stability viscoelastic plate integral constitutive law Lyapunov's direct method

Projection-based 3D bioprinting for hydrogel scaffold manufacturing

在线全文

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2022年第3期5卷 633-639页

作者： Yuan Sun Kang Yu qing gao Yong He State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Engineering for Life Group(EFL) Suzhou 215101China Key Laboratory of Materials Processing and Mold Zhengzhou UniversityZhengzhou 450002China Cancer Center Zhejiang UniversityHangzhou 310058China

Projection-based 3D bioprinting(PBP):a powerful method to fabricate 3D cellular structures Three-dimensional(3D)bioprinting has played an important role in tissue engineering and regenerative medicine areas over the past decade[1].Different from traditional cell cultures in Petri dishes,3D bioprinting can build bionic structures with a better potential to become artificial organ substitutes[2–4].With the development of photocurable biomaterials,the projection-based 3D printing method has been successfully applied in biological research[5,6].

关键词： printing biomaterials projection

The Support of the Solution for Stochastic Differential Equations Driven by G-Brownian Motion

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2012年第12期28卷 2417-2430页

作者： Fu qing gao Ming Zhou XU Department of Mathematics and Statistics Wuhan University

By a linear interpolation approximation method, we obtain a characterization of the support of the solution for stochastic differential equations driven by G-Brownian motion.

关键词： G-Brownian motion G-stochastic differential equation support theorem

Local Functional Limit Theorems of Increments for Brownian Motion

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2018年第7期34卷 1074-1086页

作者： Fu qing gao Yong Hong LIU School of Mathematics and Statistics Wuhan University Wuhan 430072 P. R. China Guangxi Colleges and Universities Key Laboratory of Data Analysis and Computation School of Mathematics and Computing Science Guilin University of Electronic Technology Guilin 541004 P. R. China

In this paper, we present a local Csorgo- Revesz type functional limit theorem for increments of Brownian motion and give its convergence rate. The results also extend the functional forms of Levy＇s modulus of contin... 详细信息

关键词： Keywords Brownian motion increment local functional limit rate of convergence large deviation small deviation

Contributions of natural systems and human activity to greenhouse gas emissions

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2018年第4期9卷 243-252页

作者： YUE Xi-Liu gao qing-Xian China Reinsurance (Group) Corporation Post-doctoral Workstation Beijing 100033 China Beijing Normal University Beijing 100875 China Chinese Research Academy of Environmental Sciences Beijing 100012 China

In this study, we conducted a literature review of relevant research and then statistically analyzed global greenhouse gas (GHG) emissions from natural systems, including forest fires, oceans, wetlands, permafrost, mud volcanoes, volcanoes, and earthquakes. Drawing on the Global Carbon Project (GCP) report, we also summarized the global anthropogenic GHG emissions. We then compared the global annual GHG emissions from natural systems with those generated by human activity. The results indicate that the global annual GHG emissions range approximately between 54.33 and 75.50 Gt CO2-eq, of which natural emissions account for 18.13e39.30 Gt CO2-eq, with the most likely value being approximately 29.07 Gt CO2-eq. According to the GCP report, the global anthropogenic emissions have increased from 22 Gt CO2-eq in 1990 to 36.2 Gt CO2-eq in 2016. The amounts of natural and anthropogenic GHGs emissions are roughly of the same order of magnitude. Anthropogenic emissions account for approximately 55.46% of the total global GHGs emissions (2016 value), i.e., the ratio of natural to anthropogenic emissions is approximately 0.8. In addition, the annual amount of GHGs absorbed by Earth systems (ocean and terrestrial ecosystems) ranges between approximately 14.4 Gt CO2-eq and 26.5 Gt CO2-eq, with natural system GHG emissions and sinks also having roughly the same order of magnitude. This finding indicates that the GHG emissions generated by human activity exert extra pressure on what is otherwise a self-balancing Earth system.

关键词： Greenhouse gases Natural emission Anthropogenic emission Global emission Natural system

Large Deviations for Parameter Estimators of Some Time Inhomogeneous Diffusion Process

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

Acta Mathematica Sinica,English Series 2011年第11期27卷 2245-2258页

作者： Shou Jiang ZHAO Fu qing gao School of Mathematics and Statistics Wuhan University Wuhan 430072 P. R. China School of Science China Three Gorges University Yichang 443002 P. R. China

The goal of this paper is to study large deviations for estimator and score function of some time inhomogeneous diffusion process. Large deviation in the non-steepness case with explicit rate functions is obtained by ... 详细信息

关键词： Parameter estimation large deviations time inhomogeneous diffusion process

Large Deviations and Moderate Deviations for Kernel Density Estimators of Directional Data

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

Acta Mathematica Sinica,English Series 2010年第5期26卷 937-950页

作者： Fu qing gao Li Na LI School of Mathematics and Statistics Wuhan University Wuhan 430072 P. R. China Department of Mathematics Tongji University Shanghai 200092 P. R. China

Let fn be the non-parametric kernel density estimator of directional data based on a kernel function K and a sequence of independent and identically distributed random variables taking values in d-dimensional unit sphere Sd-1. It is proved that if the kernel function is a function with bounded variation and the density function f of the random variables is continuous, then large deviation principle and moderate deviation principle for {sup x∈sd-1 ｜fn（x） - E（fn（x））｜, n ≥ 1} hold.

关键词： kernel density estimator directional data moderate deviations large deviations

The Fabrication of Bio-ceramsite for the Removal of Heavy Metals and Its Toxicity to Bacteria

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2015年第3期30卷 649-654页

作者：石岩 SUN Ken 齐学斌 gao qing Farmland Irrigation Research Institute Chinese Academy of Agricultural Sciences School of Environmental and Municipal Engineering North China University of Water Resources and Electric Power School of Water Resource & Environment China University of Geosciences

Bio-ceramsite technology is one of the most effective technologies in the pretreatment of drinking water. In this work, bio-ceramsite was fabricated by Citrobacterfreundii （C. freundii） immobilization on the ceramsite. The findings of the current study suggest that the bio-ceramites showed biosorption abilities for Cd（II） and Pb（II） and the removal efficiency for Pb（II） is lower than Cd（II）. The adsorption mechanism can be attributed to electrostatic attraction and covalent bond. The morphology of the cells changed after the adsorption of Cd（II） and Pb（II） due to the dissociation of the assembly of peptidoglycan and lipopolysaccharide. The fluorescence polarization has shown a significant decrease in membrane fluidity and an increase of permeability of cell membrane. The spectral profile of C. freundii suggests the alteration of carbonyl, amide and phosphonic groups on the cell membrane.

关键词： immobilization biosorption bio-ceramsite dissociation cell membrane