检索结果-南通市图书馆

Theory and application of stability for stochastic reaction diffusion systems

在线全文

学校读者我要写书评

暂无评论

science in China(Series F) 2008年第2期51卷 158-170页

作者： LUO Qi DENG FeiQi MAO XueRong BAO JunDong ZHANG YuTian College of Information and Control Nanjing University of Information Science & Technology Nanjing 210044 China College of Automation South China University of Technology Guangzhou 410640 China Department of Statistics and Modelling science University of-Strathc/yde Glasgow G1 IXH Scotland UK coilege of mathematics science Inner Mongolia Normal'University Huhhot 010000 China College of mathematics and Physics Nanjing University of Information Science & Technology Nanjing 210044 China

So far, the Lyapunov direct method is still the most effective technique in the study of stability for ordinary differential equations and stochastic differential equations. Due to the shortage of the corresponding It6 formula, this useful method has not been popularized in stochastic partial differential equations. The aim of this work is to try to extend the Lyapunov direct method to the It6 stochastic reaction diffusion systems and to establish the corresponding Lyapunov stability theory, including stability in probablity, asymptotic stability in probablity, and exponential stability in mean square. As the application of the obtained theorems, this paper addresses the stability of the Hopfield neural network and points out that the main results ob- tained by Holden Helge and Liao Xiaoxin et al. can be all regarded as the corollaries of the theorems presented in this paper.

关键词： stochastic reaction diffusion system stability in probability asymptotic stability in probability exponentialstability in mean square

Fabrication of a Bi-layer Tubular Scaffold Consisted of a Dense Nanofibrous Inner Layer and a Porous Nanoyarn Outer Layer for Vascular Tissue Engineering

在线全文

学校读者我要写书评

暂无评论

Journal of Donghua University(English Edition) 2014年第5期31卷 718-722页

作者： CHEN Jian-feng LIU Wei WU Tong LI Da-wei ZHANG Jian-guang WANG Nan-ping MO Xiu-mei State KeyLaboratory for Modifications of Chemical Fibers and Polymer Materials- Coilege of Material Science and EngineeringDonghua University Shanghai 201620 China Biomaterials and Tissue Engineering Laboratory College of Chemistry Chemical Engineering and Biotechnology DonghuaUniversity Shanghai 201620 China Shanghai Fisheries Research Institute Shanghai 201620 China

Recent years, it has attracted more attentions to increase the porosity and pore size of nanofibrous scaffolds to provide the for the cells to grow into the small-diameter vascular grafts. In this study, a novel bi-layer tubular scaffold with an inner layer and an outer layer was fabricated. The inner layer was random collagen/poly （ L-lactide-co-caprolactone ） I P （ LLA- CL） ] nanofibrous mat fabricated by conventional electrospinning and the outer layer was aligned collagen/P （LLA-CL） nanoyarns prepared by a dynamic liquid dectrospinning method. Fourier transform infrared spectroscopy （FTIR） was used to characterize the chemical structure. Scanning electron microscopy （ SEM ） was employed to observe the morphology of the layers and the cross- sectioned bi-layer tubular scaffold. A liquid displacement method was employed to measure the porosities of the inner and outer layers. Stress-strain curves were obtained to evaluate the mechanical properties of the two different layers and the bi-layer membrane. The diameters of the nanofibers and the nanoyarns were （480 ± 197 ） nm and （ 19.66 ± 4.05 ） μm, respectively. The outer layer had a significantly higher porosity and a larger pore size than those of the inner layer. Furthermore, the bi-layer membrane showed a good mechanical property which was suitable as small-diameter vascular graft. The results indicated that the bi-layer tubular scaffold had a great potential application in small vascular tissue engineering.

关键词： nanoyarn poly ( L-lactide-co-caprolactone ) [ P ( LLA-CL ) ] bi-layer tubular scaffold porous structure small vascular tissueengineering

在线全文

学校读者我要写书评

暂无评论

大节竹属一新种

湖南师范大学自然科学学报 1980年第1期 102-103页

作者：赵奇僧杨保民 coilege OF FORESTRY NANJING HUNAN TEACHERS coilege

地下茎单轴型。竿直立散生,高5—7米,直径1—2厘米,竿壁厚3毫米,内壁附有1—2毫米厚的海绵状髓质物;中部节间长20—25厘米左右,分枝一侧具沟槽,微粗糙;节强烈膨大,膝曲,竿环显著,高于箨环,节上下幼时有白粉。竿鞘早落,纸质,短于节间,长... 详细信息

地下茎单轴型。竿直立散生,高5—7米,直径1—2厘米,竿壁厚3毫米,内壁附有1—2毫米厚的海绵状髓质物;中部节间长20—25厘米左右,分枝一侧具沟槽,微粗糙;节强烈膨大,膝曲,竿环显著,高于箨环,节上下幼时有白粉。竿鞘早落,纸质,短于节间,长三角形,先端平截,背面有隆起的纵条纹和稀疏的疣基针毛,边缘无纤毛,无耳和繸毛;

关键词：竹秆髓质白质海绵状纤毛绒毛基部

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国地理人的解决研究的概述和进步

Journal of Geographical sciences 2016年第8期26卷 1159-1175页

作者： MA Renfeng WANG Tengfei ZHANG wenzhong YU Jianhui WANG Dai CHEN Li JIANG Yanpeng FENG Gequn Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Department of Geography Ningbo University Ningbo 315211 Zhejiang China coilege of Arts and sciences Beijing Union'University Beijing 100191.China College of Asia and the Pacific The Australian National University Canberra ACT 0200 Australia

Increasing Chinese urbanization and industrialization has prompted greater attention to the study of human settlement and the human-land relationship in the fields of geography, architecture, and urban planning. We used bibliometric methods and statistical software to review 180 articles on human settlement in 16 Chinese geographical journals. We found that Chinese geographical human settlement research is characterized by the following：（1） Most research focuses on human settlement extension, valuation indicators, models for urban and rural settlements, theoretical exploration and the planning practices of single-factor, human settlement and complex, geographical livability in macro-scale, urban settlement differentiation and ideal patterns in medium scale, the comprehensive evaluation of settlement environment, and the planning of community units in micro-scale, community settlements; socio-cultural investigation and warnings about advancing human settlement.（2） No progress has been made in synthesizing and integrating method systems. PSR models and DPSIR models are used for targeting mechanisms, while the standard settlement evaluation system was composed of physical ＆ economic indicators by questionnaire surveys. On the other hand, spatial clustering based on GIS has been a frequent focus in recent years. Pioneering research on human settlement and theoretical systems within the context of China＇s urbanization and industrialization will provide guidance on the sustainability of Chinese cities and regions. The following five aspects require greater attention：（1） Natural suitability research on human settlement, and a survey of human settlement demands to reflect the range of different demands concerning ecologically suitable settlements in urban environments, the corresponding valuation indicators, systems, and evolution, and the impact of the residents＇ socio-economic attributes.（2） Spatial-temporal evaluation and sustainability research on urban and rural human

关键词： city and countryside region human settlement quality urbanization and industrialization human settlement evolution and control