高中新课程实施中的问题与对策

自2008年秋季开始,我省普通高中起始年级全面实施新课程实验,学分制、选课制、模块学习、成长记录这些新鲜概念让高中生体验到了全新的学习方式。各级教育行政部门高度重视基础教育课程改革工作,认真研究,悉心指导,教师培训及时有效;各中学积极实践,稳步实施,课程改革工作稳步进行。     

美国科学家发现线虫线粒体代谢状态是控制生命长度的关键

据2010年12月4日好参考消息》援引美国每日科学网站2010年12月2日报道,美国得克萨斯大学卫生科学中心圣安东尼奥校区的杰弗里·巴特勒和沙恩·雷在《美国实验生物学联合会会志》月刊封面上发表了他们的这一研究结果。     

想象过滤与建构控制——萨义德《东方学》的教育想象

人是多面性和复杂化的异样存在。不同的地缘性存在、文化性存在和价值性存在及其不同群体在社会政治经济文化资本权力上的不同,使得双方的交往互动表现出建构或被建构、殖民或被殖民、主导或被主导的权力话语或文化霸权特征,教育亦如是。在既有的教育生活世界中,我国教育领域教师与学生、学校与教师和政府与学校三重基本关系之间也存在着想象与控制。可以以师生关系为范例阐明两相关系的基本样态、合理抉择及其和谐关系构建下的可能路径。     

集成式模块课程在农村教师培训中的运用

集成式模块课程满足了农村教师对实践能力、专业发展及培训课程多元化的需求,能有效解决现行农村教师培训“职后继续教育职前化、城乡继续教育同一化”的弊端,是农村教师培训课程变革的必然诉求。将集成式模块课程用于农村教师培训,需结合农村实际,建立以“集中培训为辅助,以网络平台为载体,以校本教研为依托”的三级统整培训模式,以及“政企联动、城乡联动、院校联动”的双边联动保障体系。     

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.     

伺服技术在卷烟机烟支重量控制系统中的应用

目前主流卷接机组烟支重量控制系统的执行部分均采用110V普通单相电机,存在着重量控制精度偏低、维修费用较高的问题．通过技术创新和改造,在ZJ15XG型机组上构建了由伺服系统、微型PLC组成的控制系统,有效地解决了原系统存在的问题,一台机组每年可节约费用近5万元．     

汉代的社会谣言和谣言控制

我国古代广泛存在的以民歌、民谣、童谣、讹言和流言为代表的社会谣言,作为一种特殊的公众舆论,具有复杂的社会政治和文化背景。汉代统治者重视这类社会谣言及其造成的社会影响,并对之作出积极的政治回应或政策调整。但在一定的社会和政治背景下,汉代统治者也会对社会谣言加以疏导、利用或限制、打击,以维护其统治权威和社会政治秩序。     

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。     

试论高校集中采购内部控制制度的构建

内部控制制度是指经济单位和组织在经济活动中建立的一种相互制约的业务组织形式和职责分工制度[1]。从理论与实践的角度研究集中采购内部控制制度,分析高校集中采购存在的不足,探讨高校集中采购内部控制制度的建设内容,对规范高校集中采购行为,提高集中采购质量,防范采购风险,保证集中采购健康、高效进行,有着非常重要的现实意义。