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开源软件系统中社会-技术网络的协同演化分析

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复杂系统与复杂性科学 2015年第2期12卷 38-45页

作者：何鹏李兵程璨曾诚武汉大学软件工程国家重点实验室计算机学院武汉430072 武汉大学国际软件学院武汉430072 武汉大学复杂网络研究中心武汉430072 湖北大学计算机与信息工程学院武汉430062

收集了开源软件项目Vuze 10个连续版本的源代码与开发者交互历史数据,构建对应的软件网络与开发者网络,依次从网络规模、平均度、最短路径和聚类系数,以及社区结构4个方面对比了两类网络的协同演化。结果表明:软件网络以3-4个版本周期... 详细信息

收集了开源软件项目Vuze 10个连续版本的源代码与开发者交互历史数据,构建对应的软件网络与开发者网络,依次从网络规模、平均度、最短路径和聚类系数,以及社区结构4个方面对比了两类网络的协同演化。结果表明:软件网络以3-4个版本周期性增长,而开发者网络呈明显的线性增长;整体上平均度均满足近似线性增长;'小世界'特性越来越明显,最短路径周期性下降,但开发者间局部合作更明显;模块度呈下降趋势,但开发者网络中波动更大。

关键词：社会-技术网络软件网络开发者网络软件演化

超高清内窥镜成像及智能控制系统关键技术研究

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中国医疗器械信息 2024年第15期30卷 49-52页

作者：陈顺俊龙淑嫔刘万里区奕猛廖炯辉潘江罗灿成罗汉军刘宽余朱醒悟刘雄张丽迪广东埃纳生医学科技有限公司广东河源517000 河源职业技术学院广东河源517000

针对当前内窥镜设备获取图像清晰度较低、拍摄镜头无法调整角度导致拍摄范围较小无法满足需求、内窥镜手持部分结构不合理导致操作不方便以及易造成医务工作者手部握持疲劳、图像数据处理主机系统功能单一和数据传输有限等问题,通过对... 详细信息

针对当前内窥镜设备获取图像清晰度较低、拍摄镜头无法调整角度导致拍摄范围较小无法满足需求、内窥镜手持部分结构不合理导致操作不方便以及易造成医务工作者手部握持疲劳、图像数据处理主机系统功能单一和数据传输有限等问题,通过对内窥镜成像系统进行结构设计和优化、采用微型工作者进行数据处理,设计了一种能够实现多角度拍摄、多数据接口输出的高效超高清内窥镜成像及控制系统。

关键词：内窥镜超高清分辨率可旋转插管智能控制

Polymer Fiber Rigid Network with High Glass Transition Temperature Reinforces Stability of Organic Photovoltaics

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Nano-Micro Letters 2024年第11期16卷 56-69页

作者： Qiao Zhou Cenqi Yan Hongxiang Li Zhendong Zhu Yujie Gao Jie Xiong Hua Tang can Zhu Hailin Yu Sandra P.Gonzalez Lopez Jiayu Wang Meng Qin Jianshu Li Longbo Luo Xiangyang Liu Jiaqiang Qin Shirong Lu Lei Meng Frédéric Laquai Yongfang Li Pei cheng College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065People’s Republic of China KAUST Solar Center Physical Science and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)ThuwalKingdom of Saudi Arabia Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190People’s Republic of China Department of Material Science and Technology Taizhou UniversityTaizhou 318000People’s Republic of China

Organic photovoltaics(OPVs)need to overcome limitations such as insufficient thermal stability to be *** reported approaches to improve stability either rely on the development of new materials or on tailoring the donor/acceptor morphology,however,exhibiting limited ***,it is timely to develop an easy method to enhance thermal stability without having to develop new donor/acceptor materials or donor–acceptor compatibilizers,or by introducing another third ***,a unique approach is presented,based on constructing a polymer fiber rigid network with a high glass transition temperature(T_(g))to impede the movement of acceptor and donor molecules,to immobilize the active layer morphology,and thereby to improve thermal stability.A high-T_(g) one-dimensional aramid nanofiber(ANF)is utilized for network *** OPVs with ANF network yield superior thermal stability compared to the ANF-free *** ANF network-incorporated active layer demonstrates significantly more stable morphology than the ANF-free counterpart,thereby leaving fundamental processes such as charge separation,transport,and collection,determining the device efficiency,largely *** strategy is also successfully applied to other photovoltaic *** strategy of incorporating a polymer fiber rigid network with high T_(g) offers a distinct perspective addressing the challenge of thermal instability with simplicity and universality.

关键词： Inverted organic photovoltaics Thermal stability Aramid nanofibers Morphology control Charge carrier dynamics

基于瞬发伽马中子活化分析技术的金属样品检测研究

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光谱学与光谱分析 2022年第6期42卷 1928-1933页

作者：程璨黑大千贾文宝单卿凌永生赵冬南京航空航天大学材料科学与技术学院核科学与技术系江苏南京211106 兰州大学核科学与技术学院甘肃兰州730000

在合金材料的生产过程中,不同金属元素的含量改变对产品的性能以及可靠性有重要的影响,通过在线检测技术能够对产品中不同元素含量进行实时分析,从而指导其工业生产过程,提高产品质量。目前常规的无损检测方法受限于分析深度,无法对样... 详细信息

在合金材料的生产过程中,不同金属元素的含量改变对产品的性能以及可靠性有重要的影响,通过在线检测技术能够对产品中不同元素含量进行实时分析,从而指导其工业生产过程,提高产品质量。目前常规的无损检测方法受限于分析深度,无法对样品内部成分进行分析,从而影响测量结果的准确性。瞬发伽马中子活化分析(PGNAA)技术是一种高灵敏度、多元素同时分析的无损检测技术,可以对大块样品进行快速分析。针对PGNAA技术在大体积金属样品检测的可行性进行研究,通过测量快中子与样品发生非弹性散射反应激发的伽马射线对样品成分进行分析。搭建了一套测量系统,包括D-T中子发生器,中子反射体,中子准直体,高纯锗(HPGe)探测器及探测器屏蔽防护。首先,对Fe,Ti,Cr,Ni和Cu等5种金属元素进行了分析研究。对不同质量下的样品进行测量,通过伽马能谱处理软件GAMMAFIT对HPGe探测器测量到的特征伽马峰进行拟合,获得全能峰的净面积。分析全能峰净面积与样品质量之间的响应,对探测器的探测效率变化造成的非线性响应进行修正,得到不同元素的校准曲线,结果显示各元素修正后的校准曲线均具有良好的线型关系。对不同元素的质量检测限进行分析,不同金属元素的质量检测限分别为Fe(44 g),Ti(25 g),Cr(33 g),Ni(108 g)和Cu(72 g)。利用测量系统对不锈钢合金样品中的Fe和Cr元素含量测量开展了研究,通过测量标准样品建立了Fe和Cr元素的定标曲线,并对未知样品进行了测量分析。同时与X射线荧光光谱(XRF)测量结果进行了对比分析,结果表明两种方法的Fe元素和Cr元素测量值偏差分别为4.08%和2.97%。研究结果表明,利用PGNAA技术可以对多种金属元素和合金样品进行测量分析,为后续其他金属样品的检测奠定了研究基础。

关键词：瞬发伽马中子活化分析大块金属样品元素分析中子发生器

Cohomology groups of a new class of Kadison-Singer algebras

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Science China Mathematics 2024年第3期67卷 593-606页

作者： Guangyu An Xing cheng Jun Sheng School of Mathematics and Data Science Shaanxi University of Science and TechnologyXi’an 710021China

Let N be a maximal discrete nest on an infinite-dimensional separable Hilbert space H,ξ=∑^(∞)_(n=1)en/2n be a separating vector for the commutant N',E_(ξ)be the projection from H onto the subspace[Cξ]spanned by the vectorξ,and Q be the projection from K=H⊕H⊕H onto the closed subspace{(η,η,η)^(T):η∈H}.Suppose that L is the projection lattice generated by the projections(E_(ξ) 0 0 0 0 0 0 0 0),{(E 0 0 0 0 0 0 0 0):E∈N},(I 0 0 0 I 0 0 0 0) and *** show that L is a Kadison-Singer lattice with the trivial ***,we prove that every n-th bounded cohomology group H~n(AlgL,B(K))with coefficients in B(K)is trivial for n≥1.

关键词： Kadison-Singer algebra Kadison-Singer lattice derivation cohomology group

Rational Schur Superalgebras

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Algebra Colloquium 2024年第2期31卷 209-220页

作者： Andrew Riesen Shun-Jen cheng Department of Mathematical and Statistical Sciences University of Alberta 1132489 Ave NWEdmontonAlbertaCanada 不详

We develop and study the generalization of rational Schur algebras to the super *** to the classical case,this provides a new method for studying rational supermodules of the general linear supergroup GL(m|n).Furthermore,we establish a Schur-Weyl duality result for rational Schur superalgebras and conclude that under certain conditions these objects will be semisimple.

关键词： Schur algebra supermathematics general linear supergroup

Study on Construction of Forestry Socialized Service Systems Based on Barnard's Organizational Structure Theory

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Agricultural Science & Technology 2011年第4期12卷 603-607页

作者： WANG can-fu cheng Xiao-qiu Xiushui Forestry BureaU Xiushui 332400

Construction of forestry socialized service systems is the important content for reform of collective forestry tenure *** on the necessity,possibility and problem of construction of forestry socialized service system,according to Barnard's Organizational Structure theory,the path and countermeasure of forestry socialized service system in China are discussed.

关键词：社会化服务体系建设结构理论林业组织制度改革使用权集体林

Friction Characteristics Between Marine Clay and Construction Materials

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Journal of Ocean University of China 2024年第2期23卷 427-437页

作者： KOU Hailei HUANG Jiaming cheng Yang College of Engineering Ocean University of ChinaQingdao 266100China Fourth Division Organization Department of the CPC Qingdao Municipal CommitteeQingdao 266100China

Structure-soil interface friction characteristics is of importance to investigate the interaction between engineering structures and soils,especially for offshore *** interface friction behavior between marine clay and structural materials with different roughness was studied in this paper by using 3D optical scanning tests,a modified direct shear device and numerical *** between the surface roughness of structures,water content and interface friction angle were presented by model *** increase of water contents decreased the interface friction *** interfaces with different roughness,the interface friction angles will be smaller than that of the soil when the water content exceeds a certain *** roughness of the interface and the water content of the soil are mutually coupled to influence the coefficient of friction(COF).This paper proposed a Finite Element Method(FEM)to simulate the interface direct shear tests of structures with different *** surface models with different roughness are established based on the structure data obtained by 3D *** Coupled Eulerian-Lagrangian(CEL)approach was employed to analyse soils sheared by irregular *** interface behavior for interfaces with different roughness under cyclic shear stresses was analyzed by FEM.

关键词： marine clay construction material interface friction behavior surface roughness Finite Element Method

Continuous Orbit Equivalence of Semigroup Actions

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Acta Mathematica Sinica,English Series 2024年第6期40卷 1581-1598页

作者： Xiang Qi QIANG cheng Jun HOU School of Mathematical Science Yangzhou UniversityYangzhou 225002P.R.China

We introduce notions of continuous orbit equivalence and its one-sided version for countable left Ore semigroup actions on compact spaces by surjective local homeomorphisms,and characterize them in terms of the corresponding transformation groupoids and their operator *** particular,we show that two essentially free semigroup actions on totally disconnected compact spaces are continuously orbit equivalent if and only if there is a canonical abelian subalgebra preserving C^(∗)-isomorphism between the associated transformation groupoid C^(∗)-*** also give some examples of orbit equivalence,consider the special case of semigroup actions by homeomorphisms and relate continuous orbit equivalence of semigroup actions to that of the associated group actions.

关键词： Semigroup action continuous one-sided orbit equivalence continuous orbit equivalence groupoid C^(∗)-algebras