检索结果-南通市图书馆

CONVERGENCE RATE OF A GENERALIZED ADDITIVE SCHWARZ ALGORITHM

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2006年第5期24卷 635-646页

作者： jin-ping Zeng Gao-jie Chen College of Mathematics and Econometrics Hunan University Changsha 410082 China

The convergence rate of a generalized additive Schwarz algorithm for solving boundary value problems of elliptic partial differential equations is studied. A quantitative analysis of the convergence rate is given for the model Dirichlet problem. It will be shown that a greater acceleration of the algorithm can be obtained by choosing the parameter suitably. Some numerical tests are also presented in this paper.

关键词： Schwarz additive algorithm Convergence rate Dirichlet problem.

A new stationary droplet evaporation model and its validation

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 Aeronautics 2017年第4期30卷 1407-1416页

作者： Fang WANG jie YAO Shaofeng YANG Rui LIU jie jin Aero-engine Numerical Simulation Research Center School of Energy and Power Engineering Beihang University Beijing100083 China Co-Innovation Center for Advanced Aero-Engine Beijing 100083 China

The liquid droplet evaporation character is important for not only combustion chamber design process but also high-accuracy spray combustion simulation. In this paper, the suspended droplets＇ evaporation character was measured in a quiescent high-temperature environment by micro high-speed camera system. The gasoline and kerosene experimental results are consistent with the reference data. Methanol, common kerosene and aviation kerosene droplet evaporation characteristics, as well as their evaporation rate changing with temperature, were obtained. The evaporation rate experimental data were compared with the prediction result of Ranz-Marshall boiling temperature model（RMB）, Ranz-Marshall low-temperature model（RML）, drift flux model（DFM）, mass analogy model（MAM）, and stagnant film model（SFM）. The disparity between the experimental data and the model prediction results was mainly caused by the neglect of the natural convection effect, which was never introduced into the droplet evaporation concept. A new droplet evaporation model with consideration of natural convection buoyancy force effect was proposed in this paper. Under the experimental conditions in this paper, the calculation results of the new droplet evaporation model were agreed with the experimental data for kerosene, methanol and other fuels, with less than 20% relative deviations. The relative deviations between the new evaporation model predictions for kerosene and the experimental data from the references were within 10%.

关键词： Droplet Evaporation model Evaporation rate Kerosene Natural convection Thick exchange layer theory

Filter implantation for double inferior vena cava: A case report and literature review

在线全文

学校读者我要写书评

暂无评论

World Journal of Emergency Medicine 2021年第4期12卷 332-334页

作者： Lei Jiang chuan-feng Yang jie Lin Department of Emergency the Fourth Affi liated Hospital of Zhejiang University School of MedicineYiwu 322000China

Dear editor,Deep vein thrombosis (DVT) is a common peripheral vascular disease, causing pulmonary embolism, post-venous thrombosis syndrome, chronic thrombotic pulmonary hypertension, and other complications.[1] The inferior vena cava filter (IVCF) implantation combined with adequate anticoagulation could lower the incidence of fatal PE to <1%.[2] In clinical practice, the double inferior vena cava (IVC) malformation along with lower extremity DVT (LEDVT) is rarely seen.

关键词： vena cava implantation

Sod gene of Curvularia lunata is associated with the virulence in maize leaf

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2017年第4期16卷 874-883页

作者： GAO Shi-gang NI Xuan LI Ying-ying FU Ke-he YU chuan-jin GAO jin-xin WANG Meng LI Ya-qian CHEN jie School of Agriculture and Biology Shanghai Jiao Tong University/State Key Laboratory of Microbial MetabolismShanghai Jiao Tong University/Key Laboratory of Urban Agriculture(South)Ministry of Agriculture School of Biology Nanchang Normal University

Curvularia leaf spot, caused mainly by Curvularia lunata, is a widespread plant disease in China. In the recent years, di- rectional host selection by the pathogen, which likely results in the virulence differentiation in pathogens, is widely reported. Among the hallmarks potentially associated to pathogen variation in virulence, superoxide dismutase gene Sod has been found to be closely related to the enhancement of virulence. In the present study, the full-length of Sod was obtained via Blastn alignment against GenBank and the whole genome of C. lunata. In order to understand the role of Sod in the vir- ulence variation in C. lunata, targeted gene disruption was performed to construct Sod mutants. The cell wall degrading enzyme （CWDE） activities and toxin production of ASod were not distinctly different from wild-type strain CX-3 and its complon. However, at an early stage of infection, 3Sod virulence appeared to be lower than CX-3 and the complon, while at a later stage, its virulence gradually returned to the level of CX-3 and the complon. Furthermore, the melanin production of ASod was significantly reduced compared to CX-3 and the complon, suggesting that Sod gene influences the virulence by regulating melanin production at an early stage of infection but is not essential for pathogenicity. However, the disruption of Sod did not significantly affect the transcriptional expression of the melanin biosynthesis-associated genes, bml and scd. Therefore, we infer that Sod in C. lunata are involved, to some extent, with the virulence in maize leaf, but still needs further studies to have a clear understanding of its mechanism.

关键词： Curvularia lunata Sod gene function infection

The journey of nisin development in China,a natural-green food preservative

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2015年第10期6卷 709-711页

作者： jie Zhang jin Zhong Institute of Microbiology Chinese Academy of Sciences

In 2005,the project“Research and Development of Nisin”led by *** Huan was awarded the National Science&Technology Progress Prize(Second Class Prize)and China National Food Industry Association(CNFIA)Science&Technology Prize(Special Prize).Nisin is a lantibiotic(bacteriocin containing unusual amino acids)(Fig.1)mainly produced by gram-positive lactic acid

关键词： natural-green development preservative

Integrating outlier filtering in large margin training

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第5期12卷 362-370页

作者： Xi-chuan ZHOU Hai-bin SHEN jie-ping YE College of Communication Engineering Chongqing University Chongqing 400044 China School of Electrical Engineering Zhejiang University Hangzhou 310027 China Dcpartment of Computer Science and Engineering Arizona State University Tempe 85281 USA

Large margin classifiers such as support vector machines (SVM) have been applied successfully in various classification ***,their performance may be significantly degraded in the presence of *** this paper,we propose a robust SVM formulation which is shown to be less sensitive to *** key idea is to employ an adaptively weighted hinge loss that explicitly incorporates outlier filtering in the SVM training,thus performing outlier filtering and classification *** resulting robust SVM formulation is *** first relax it into a semi-definite programming which admits a global *** improve the efficiency,an iterative approach is *** have performed experiments using both synthetic and real-world *** show that the performance of the standard SVM degrades rapidly when more outliers are included,while the proposed robust SVM training is more stable in the presence of outliers.

关键词： Support vector machines Outlier filter Semi-definite programming Multi-stage relaxation

An Analytical Approach to Thermal and Electrical Transport in a Mesoscopic Conductor

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第4X期44卷 735-742页

作者： WANG Zheng-chuan SU Gang LI Ling GAO jie Department of Physics Graduate School of the Chinese Academy of Sciences Beijing 100049 China Department of Physics Sichuan University Chengdu 610018 China

In order to consider the thermal and electrical coherent transport in a mesoscopic conductor under the influence of electron-electron interaction, in this paper, we establish a method in terms of which one can analytically obtain the Hartree self-consistent potential instead of computing it by the numerical iterative procedure as usual, which is convenient for us to describe the thermal and electric current flow through a mesoscopic conductor. If we study the electron-electron interaction at the Hartree approximation level, the Hartree potential satisfies the Poisson equation and Schroedinger equation, so when we expand the action function S（x） by Planck constant h, the self-consistent potential and the wavefunction can be solved analytically order by order, and the thermal and electrical conductance can thus be obtained readily. However, we just show the quantum corrections up to the second order.

关键词： mesoscopic conductor thermal and electrical transport

Biomimetic Design and Optimal Swing of a Hexapod Robot Leg

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2014年第1期11卷 26-35页

作者： jie Chen Yubin Liu jie Zhao He Zhang Hongzhe jin State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin 150001 P. R. China

Biological inspiration has spawned a wealth of solutions to both mechanical design and control schemes in the efforts to develop agile legged machines. This paper presents a compliant leg mechanism for a small six-legged robot, HITCR-ll, based on abstracted anatomy from insect legs. Kinematic structure, relative proportion of leg segment lengths and actuation system were analyzed in consideration of anatomical structure as well as muscle system of insect legs and desired mobility. A spring based passive compliance mechanism inspired by musculoskeletal structures of biological systems was integrated into distal segment of the leg to soften foot impact on touchdown. In addition, an efficient locomotion planner capable of generating natural movements for the legs during swing phase was proposed. The problem of leg swing was formulated as an optimal control procedure that satisfies a series of locomotion task terms while minimizing a biologically-based objective function, which was solved by a Gauss Pseudospectral Method （GPM） based numerical technique. We applied this swing generation algorithm to both a simulation platform and a robot prototype. Results show that the proposed leg structure and swing planner are able to successfully perform effective swing movements on rugged terrains.

关键词： biomimetic design legged robot optimal control biological movement principle Gauss pseudospectral method

Anisotropic coal permeability and its stress sensitivity

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

International Journal of Mining Science and Technology 2019年第3期29卷 507-511页

作者： Zhiming Yan Kai Wang jie Zang chuan Wang Ang Liu Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining & TechnologyBeijing 100083China Yangquan Coal Industry (Group) Co. LTDYangquan 045000China Faculty of Resource & Safety Engineering China University of Mining & TechnologyBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining & TechnologyBeijing 100083China

This paper focuses on anisotropy of coal permeability and its stress *** blocks were taken from Xinjing Coal Mine in Yangquan Coal *** cores were then drilled along the strike,dip,and vertical *** permeabilities were measured with respect to stress by using a self-developed coal permeability measurement *** used samples exhibited significant permeability *** permeability along the strike direction was greatest among the three directions,the permeability along the vertical direction was the smallest,and the permeability along the dip direction was between the other two *** sensitivity of coal permeability to stress was transversely *** stress sensitivity coefficient was greater along the horizontal directions than along the vertical *** permeability exhibited anisotropic stress sensitivity due to anisotropy in Young’s modulus and *** results obtained in this study are useful for optimizing the arrangement of pre-drainage boreholes.

关键词： Coal permeability Anisotropy Stress sensitivity Gas drainage Experiment