检索结果-南通市图书馆

Multiscale Basis Functions for Singular Perturbation on Adaptively Graded Meshes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2014年第5期6卷 604-614页

作者： mei-Ling Sun Shan jiang College of Mathematics Science Yangzhou UniversityYangzhou 225002China Education and Technology Center Nantong Vocational CollegeNantong 226007China Department of Mathematics Texas A&M UniversityCollege StationTX 77843USA

We apply the multiscale basis functions for the singularly perturbed reaction-diffusion problem on adaptively graded meshes,which can provide a good balance between the numerical accuracy and computational *** multiscale space is built through standard finite element basis functions enriched with multiscale basis *** multiscale basis functions have abilities to capture originally perturbed information in the local problem,as a result our method is capable of reducing the boundary layer errors remarkably on graded meshes,where the layer-adapted meshes are generated by a given *** numerical experiments we demonstrate that the multiscale method can acquire second order convergence in the L^(2)norm and first order convergence in the energy norm on graded meshes,which is independent ofε.In contrast with the conventional methods,our method is much more accurate and effective.

关键词： Multiscale basis functions singular perturbation boundary layer adaptively graded meshes.

掺杂磷烯二维纳米材料对草甘膦吸附机理的研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第4期42卷 58-64页

作者：王群周乃武单正莉覃庆雨刘钰佳王梅梅青刚孙玉希绵阳师范学院生命科学与技术学院绵阳621006 绵阳师范学院化学与化学工程学院绵阳621000 绵阳师范学院光致功能材料重点实验室绵阳621006 曲阜师范大学生命有机分析重点实验室曲阜273165 北京市食品风味化学重点实验室北京100048

草甘膦是世界上普遍使用的除草剂之一,被广泛使用在农田和非农田杂草的防治.由于草甘膦类除草剂的大范围应用,其对动植物的危害性逐渐受到人们的关注.磷烯二维纳米材料与草甘膦之间相互作用机理的研究对草甘膦的检测及去除具有重大的意... 详细信息

草甘膦是世界上普遍使用的除草剂之一,被广泛使用在农田和非农田杂草的防治.由于草甘膦类除草剂的大范围应用,其对动植物的危害性逐渐受到人们的关注.磷烯二维纳米材料与草甘膦之间相互作用机理的研究对草甘膦的检测及去除具有重大的意义.本研究将采用基于密度泛函理论方法考察本征及Al,Ca,Ti及Fe金属原子掺杂的磷烯对草甘膦的吸附,通过吸附能,差分电荷密度,布居电荷分析本征及金属原子掺杂磷烯对草甘膦的吸附机制,从分子和原子水平上研究它们之间的详细机理.研究结果有望为掺杂磷烯材料在草甘膦吸附方面的应用提供有意义的理论参考.

关键词：磷烯掺杂磷烯草甘膦密度泛函理论

Generation of W-Type Entangled Coherent States of Three-Cavity Fields by a Driving Classical Field

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第2X期46卷 303-305页

作者： CHEN mei-Feng jiang Xia-Ping Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 China

A scheme is proposed to generate the W-type entangled coherent states of three-cavity field. The scheme is based on the resonant atom-field interaction, thus the interaction time between the atom and the cavity is greatly reduced, which is important in view of decoherence. Furthermore, the scheme does not need accurate adjustment of the interaction time.

关键词： resonant interaction driving classical field W-type entangled coherent states

Microfluidic sequential injection analysis system based on polydimethylsiloxane (PDMS) chip with integrated pneumatic-actuated valves

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2012年第4期55卷 531-536页

作者： FAN JiFeng ZHU Ying SHI XiaoTong FANG qun HUANG jiang Institute of Microanalytical Systems Department of ChemistryZhejiang UniversityHangzhou 310058China Research Center for Analytical Instrumentation Institute of Cyber-Systems and ControlState Key Laboratory of Industrial Control TechnologyZhejiang UniversityHangzhou 310058China

A sequential injection analysis (SIA) system based on polydimethylsiloxane (PDMS) chip with integrated pneumatic-actuated valves was developed. A novel SIA operation mode using multiphase laminar flow effect and pneumatic microvalve control was proposed. The sample and reagent solutions were synchronously loaded and injected in the chip-based sample injection module instead of multi-step sequential injection by a multiposition valve and a reciprocating pump as in conventional SIA system. The sample and reagent injection volumes were reduced to ca. 1.1 nL. The present system has the advantages of simple structure, fast and convenient operation, low sample and reagent consumption, and high degree of integration and automation. The system operation conditions were optimized using fluorescein as model sample. Its feasibility in biological analysis was preliminarily demonstrated in enzyme inhibition assay.

关键词： microfluidic chip PDMS chip pneumatic-actuated valve sequential injection analysis

Liver fibrosis evaluation by ARFI and APRI in chronic hepatitis C

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第28期20卷 9528-9533页

作者： Su-mei Li Guang-Xia Li Dong-mei Fu Yu Wang Li-qun Dang Department of Physical Diagnosis B Ultrasound Room Daqing Longnan Hospital Qiqihar Medical College Affiliated Fifth Hospital

AIM: To explore the value of liver fibrosis assessment by acoustic radiation force impulse (ARFI) and the AST/PLT ratio index (APRI) in chronic hepatitis C patients.

关键词： Liver fibrosis Chronic hepatitis C Acoustic radiation force impulse AST/PLT ratio index Sensitivity Specificity

Study Under AC Stimulation on Excitement Properties of Weighted Small-World Biological Neural Networks with Side-Restrain Mechanism

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第2期47卷 369-373页

作者： YUAN Wu-Jie LUO Xiao-Shu jiang Pin-qun College of Physics and Electronic Engineering Guangxi Normal University Guilin 541004 China Department of Physics Huaibei Coal Industry Teachers College Huaibei 235000 China

In this paper, we propose a new model of weighted small-world biological neural networks based on biophysical Hodgkin-Huxley neurons with side-restrain mechanism. Then we study excitement properties of the model under alternating current （AC） stimulation. The study shows that the excitement properties in the networks are preferably consistent with the behavior properties of a brain nervous system under different AC stimuli, such as refractory period and the brain neural excitement response induced by different intensities of noise and coupling. The results of the study have reference worthiness for the brain nerve electrophysiology and epistemological science.

关键词： small-world networks biological neural networks side-restrain mechanism Hodgkin-Huxley equations

The anodic behavior of cerium in AlCl_3-1-ethyl-3-methyl-imidazolium chloride ionic liquid

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2018年第11期36卷 1221-1225页

作者： Yidong jiang Lizhu Luo Jun mei Xiaolin Wang Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908 China College of Nuclear Science and Technology University of Science and Technology of China Hefei 230026 China

The anodic behavior of cerium （Ce） in A1C13-1-ethyl-3-methyl-imidazolium chloride （A1CI3-EMIC） ionic liquid has been investigated. Linear sweep voltammetry （LSV）, electrochemical impedance spectra （EIS）, Raman spectra, scanning electron microscopy （SEM） and energy dispersive X-ray spectroscopy （EDS） were carried out to state the process and mechanism during anodic reaction. The results show that Ce can be electrochemically oxidized and dissolved in the ionic liquid. The oxide film of Ce markedly affects its anodic behavior by blocking the dissolution of the underlying metal. Moreover. the dissolution of metal surface brings about the stripping of the oxide film on Ce, thus leading to an oxide free surface. This work demonstrates a theoretical foundation for electrolytic etching of Ce in ionic liquids,

关键词： Ce Ionic liquid Anodic behavior Electrolytic etching

Ensuring consistency of Web services transaction

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2009年第4期16卷 59-66页

作者： WANG Xiao-jun LI Yang-qun WU Xiao-mei MIN Li-juan Institute of Information and Network Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China Foreign Languages Office Nanjing Institute of Politics Nanjing 210003 China

Composite Web services provide promising prospects for conducting cross-organizational Web service transactions. Such transactions generally require longer processing time and manipulate financially critical data. To efficiently manage these Web services transactions, isolation is commonly relaxed, but inconsistency will be caused by concurrently executing isolation-relaxing transactions. This article proposes an extension to the WS-Business Activity Protocol, which ensures the consistent executions of isolation-relaxing Web service transactions, and which is based on transaction dependency graphs distributed over multiple nodes. Furthermore, this article presents several algorithms implementing the protocol, and introduces the implement of a prototype system.

关键词： Web services transaction model transaction management protocol consistency

SCREEN:predicting single-cell gene expression perturbation responses via optimal transport

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2024年第3期18卷 255-257页

作者： Haixin WANG Yunhan WANG qun jiang Yan ZHANG Shengquan CHEN Cadre Medical Department The 1st Clinical CenterChinese PLA General HospitalBeijing 100853China School of Statistics Renmin University of ChinaBeijing 100872China Ministry of Education Key Laboratory of Bioinformatics Bioinformatics Division of BNRISTDepartment of AutomationTsinghua UniversityBeijing 100084China School of Mathematical Sciences and LPMC Nankai UniversityTianjin 300071China

1 Introduction Recent advances in single-cell RNA sequencing(scRNA-seq)have enabled the study of how individual cells respond to various external perturbations such as drug stimulation at gene expression level[1].Precisely inferring perturbation responses allows us to explore how and why individual tumor cells evade cancer treatment,greatly advancing personalized medicine research and deepening our understanding of biological mechanisms[2].However,considering the high costs of sequencing and the complexity of obtaining perturbed samples,utilizing computational methods to predict cellular responses to perturbations holds great potential[2].

关键词： stimulation perturbation deepening