嵌入视角下的大学网络治理机制解析

通过社会网络分析方法,可以看到大学存在多个权力中心,各主体间具有错综复杂的网络式互动关系。我国大学在现代大学制度建设中,需要构建多元嵌入的网络治理模式,通过结构嵌入、关系嵌入和认知嵌入等形式和途径增强大学内外部网络中的多种利益主体在大学治理结构中的嵌入度,并在持续互动、平等协商中形成信任与合作机制,从而实现大学的网络治理。     

网络暴力的传播学论析

网络暴力在传播的过程中,表现出了很多特点：传播角色假借正义之名、传播活动自发形成、传播内容的社会敏感性、信息结构的开放性、恶劣影响虚拟促成和传播效果容易失控。网络暴力的这些传播学特点,与网络信息传播者的情绪有着很大的关系。     

银氨溶液呈碱性的探究

从实验测定数据、理论分析对"银氨溶液显碱性"进行了分析和探究,并详细阐述了银氨溶液氧化乙醛的反应机理及本质特征.     

网络环境下大学英语教师反思能力培养的实效性研究

开展反思性教学是教师专业发展的有效途径。通过一项基于石家庄铁道大学非英语专业部分教师和学生反思网络环境下大学英语教学的行动研究,可以看出网络环境下的大学英语教学急需解决的主要问题是大学英语教师角色的转换、教学课件制作和使用的科学性、网络环境下互动教学的开展。在网络环境下开展大学英语教师反思能力培养的行动研究,对教师的教学能力和专业发展以及全面提高大学英语教学的质量,有着重要的现实意义。     

WPT-based modal control on distributed structures with MRF-04K damper

The magnetorheological (MR) fluid damper-based semiactive control systems have received considerable attention for protecting structures against natural hazards such as strong earthquakes and high winds. In this paper, a novel modal controller using wavelet packet transform (WPT) is proposed for the vibration control of distributed structures. In the proposed control system, the WPT method is utilized to decompose the acceleration measurement and select the modes containing most of the WPT energy component as the dominant modes. Then, a modal controller is designed to control the dominant modes and the optimal active control force is solved. Finally, Clipped-optimal con- trol law is adopted to determine the voltage applied to each MR damper. A Kalman-filter observer, which estimates the full controlled modal states from local accelerometer feedbacks, is designed for rendering the controller to be more applicable to distributed structures with a large number of degrees of freedom. A numerical example of a stadium roof structure installed with MRF-04K damper is presented. The effectiveness of the controller is evaluated under both Tianjin and El Centro earthquake excitations. The superior performance and adaptability of the controller for versatile loading conditions are demonstrated through the comparison with traditional truncated modal controller.     

Stabilization of Delayed Networks with Different Nodes

In this paper,the control of complex delayed networks with different nodes is proposed.Firstly,the stabilization of coupled networks with time delay is investigated.By constructing a Lyapunov function,a linear feedback controller design procedure for the networks is converted to the problem of solving a set of linear matrix inequalities.Then the results are extended to networks with both delayed dynamical nodes and delayed couplings.It is shown that the stabilization of complex networks is determined by the dynamics of each uncoupled node,coupling matrix and feedback gain matrix of networks.Two examples are simulated.In the first example,a network with 10 nodes consisting of Lorenz systems and systems proposed by Zhang in 2009 is given.It is found that the network states are divergent without control,and convergent under designed linear feedback controllers.In the second example,a larger network with 100 nodes consisting of delayed Chen systems and delayed Lorenz systems is given.The proposed method is also effective for large scale networks.     

“和谐”词义考

考证历代文献可知,＂和＂的本义指唱歌时候声音相应,引申为不同事物的协调统一。＂和谐＂首先被使用在音律上,用来指乐器和音律的协调相应,也指自然万物的协调统一。古代对乐理与自然和谐的阐释,被进一步引申,应用到家庭和国家等社会政治领域中,其词性有名词、动词两种：作为名词是指各种事物＂各安其位、不相凌越、各得其理、相互配合、相互回应＂,作为动词是指使家庭、社会、国家和谐。     

影响聚式酶链式反应实验效果的基本因素

研究聚式酶链式反应(PCR)实验中影响其扩增效果的多种因素,寻求反应体系中理想的各因素浓度配比。选取含5+10优质亚基的小麦品种为材料,以特异扩增1DX5基因PCR实验为例,从模板DNA、引物终浓度、Taq酶、二价镁离子、4dNTPs混合液、缓冲液浓度几方面入手,通过设计梯度实验,研究不同因素对PCR扩增效果的影响。结果表明,反应体系6个基本因素,缺少任何1个都扩增不出产物。在反应总体积25μL的PCR反应体系中,模板DNA选用32 ng/μL,Mg2+终浓度2 mmol/L,Taq酶1.2 U/25μL,引物0.8μmol/μL,4dNTPs0.3 mmol/L,缓冲液1×buffer最为合适,能扩增出理想的结果。     

特定消谐变频调速实验装置的研制

研制了变频调速原理和特定消谐技术相结合的实验装置,通过控制电路中的模数转换器对存储器高位地址的切换实现变压;改变循环加法计数器的计数脉冲频率实现变频。在逆变电路中采用了三菱公司的智能功率模块,简化了系统结构,提高了整个系统的可靠性和经济性。理论分析和实验结果表明:将特定消谐技术应用于变频调速系统后在节能和环保方面具有优越性能。该实验装置便于分析特定消谐技术的特点和变频调速的运行规律。     

整合ACL和NAT的网络安全实验设计

针对在计算机网络安全实验课程中访问控制列表(ACL)实验和网络地址转换(NAT)实验分散独立的现状,利用华为3Com公司的网络实验设备来实现整合ACL和NAT的网络安全实验,采用2种由易到难的网络拓扑结构,创造性地设计和实现了该实验方案。并且,结合了WWW、Telne、tFTP 3个服务器的安装和配置,以及R IP动态路由配置,既充分地验证实验结果的正确,又让学生深刻地认识了ACL和NAT的原理和作用。