Exponential stability of linear distributed parameter switched systems with time-delay

In this paper, the exponential stability analysis for ODE switched systems with time delay is extended to distributed parameter switched systems (DPSS) in Hilbert space. For a given family of exponential stable subsystems, this paper focuses on finding conditions to guarantee the overall DPSS’ exponential stability. Based on semigroup theory, by applying piecewise Lyapunov-Krasovskii functionals method incorporated average dwell time approach, sufficient conditions for exponential stability are derived. These conditions are given in the form of linear operator inequalities (LOIs) where the decision variables are operators in Hilbert space, and the stability properties depend on switching rule. Being applied to heat switched propagation equations, these LOIs are reduced to standard Linear Matrix Inequalities (LMIs). Finally, a numerical example is given to illustrate the effectiveness of the proposed result.     

LTE系统中基于估计波束到达角的多用户调度算法

根据3GPP TR 25.996中描述的空间信道模型(SCM),提出了波束到达角估计算法和基于波束到达角的多用户调度算法.针对具有明显来波方向的无线通信系统,基站首先根据上行信道信息估计出每个用户的波束到达角,然后根据用户无线信道到达角将多用户进行分组,从每个分组中选择信道质量最好的用户,以实现多用户分集增益.相对于传统的波束到达角估计算法,该估计算法具有较低的复杂度.与基于信道容量的用户调度算法相比,该调度算法能够明显降低运算量,在系统中更容易实现.仿真结果表明,该调度算法可以在有效降低系统计算复杂度和反馈信息量的前提下,获得与传统方案相近的多用户调度性能增益,同时还能获得较好的公平性.     

苏州太湖周边地区农民体育健身工程实施现状与发展对策研究

采用问卷调查、数理统计及实地考察等研究方法，对苏州太湖周边地区7个乡镇部分行政村农民体育健身工程实施现状进行了调查，结果表明：农村公共体育场地设施建设状况良好，促进了农民体育健身意识的增强，但对农民体育健身活动组织与指导的缺乏，已成为影响农民参与体育健身锻炼的重要因素．针对上述问题提出发展对策，为进一步推动农民体育健身工程深入开展提供依据．     

苏州地区肥胖大学生课外体育锻炼行为的调查与分析

对苏州地区340名肥胖大学生的身体发育程度和体育锻炼态度、动机、组织形式、锻炼频率、持续时间、影响锻炼因素等方面进行了调查与分析，并提出了相应的对策与建议．     

Visual Evaluation of the Morphologic Structure of Nonwovens Using Image Analysis and Fractal Geometry

IntroductionNonwovensarefibermaterialswhicharebasedonnonwoventechnologies.Theirmostadvantagesarethattheprocessingtechnologiesandformingmethodsfortheproductscanbedesignedscientificallyaccordingtotheirenduse.Sothattheresourcescanbeusedmostadequatelyandthesatisfactoryproductsbeobtained.Theapplicationsofnonwovensinindustry,agriculture,civilconstruction,sanitary,homeuseandsoon,arewiderandwider.Theycanbeusedasvariouskindsoffilters,adsorbents,geotextiles,insulationmaterialsofheat,soundandelectricity…     

The Recognition of Silk Fabric Defects Based on Biorthogonal Wavelet Analysis and SOM Neural Network

A feasible approach fog the recognition of silk fabric defects based on wavelet transform and SOM neural network is proposed in this paper, the indispensable processes of which are defect images denoising and enhancement, image edge detection, feature extraction and defects identification. Both geometrical and textural feature panuneters are extracted from the edge image and the enhanced defect image, and utifize SOM neural network to recognize the common defects which silk fabrics have, including warp- lacking, weft-lacking, double weft, loom bars, oll-stalin. Experimental results show the advantages with high identification correctness and high inspection speed.     

高校体育课程教学质量监控体系的构建与实践

在体育课程教学的日常管理工作中,对教学管理中的决策系统、信息反馈系统和监督控制系统的有关内容、功能以及相互间的关系进行了专题的研究与实践,旨在摸索一套适合于高校体育课程教学质量的监控体系,使课程教学的管理日趋科学化、现代化.     

农民健身工程——对建设社会主义新农村的思考

对当前农村开展农民健身工程的现状进行了分析,指出制约农民健身工程开展的主要因素是观念落后、经济制约、场所受限、政府不重视,并提出了强化农民健身意识、培养农民健身指导员、合理开展农民健身运动的建议。     

健美操选项课分层教学的实验研究

采用调查访谈、实验、数理统计等方法，对健美操选项课进行了分层教学实验研究．研究结果表明：分层教学能提高学生的整体素质；能激发不同层次学生的学习兴趣，有利于个性的发展和终身体育意识的形成；分层教学还能提高学生的编操能力．     

Chemical Modification of Silk Fibers with Ethylene Glycol Dimethacrylate

Silk fibers have been grafted with ethylene glycol dimethacrylate (EGDMA) and characteristics of the grafted silk fibers were analyzed in relation to the graft yield on the basis of the tensile properties, dyeing behaviour, durability during laundering and solubility of the specimen in NaOH solution. The amount of the acid dye absorbed by the fibers decreased with increasing graft yield, while the value of rating for washing fastness on silk fibers was almost unchanged by the graft treatment The breaking loads of the fiber were almost unchanged whereas rigidity of the fibers increased after graft treatment. Graft treatment enhanced silk fiber durability during laundering and in NaOH solution.