系统论下区域图书馆联盟特征分析及动力机制研究

图书馆联盟是一种现代图书馆协作形式,其类型也是多样化的,区域性图书馆联盟是特定区域内图书馆组成的联盟,对其动力机制进行研究,有动于联盟的顺利发展.图书馆联盟是一个开放的复杂系统,系统论下的图书馆联盟具有整体性、关联性、层次性、统一性、开放性的特性.区域图书馆联盟动力机制的影响因素主要包括动力的来源、动力动因、动力成果及成果转化4个因素.构建动力机制时,需建立适合本联盟的管理机构与管理制度、构建以“用户为中心”的服务动力、构建合理的资金投入与利益分配方案、加强信息文化建设,加强联盟与各方的信息交流,充分协调各要素之间的利益平衡.     

Construction and operation of a microrobot based on magnetotactic bacteria in a microfluidic chip

Magnetotactic bacteria (MTB) are capable of swimming along magnetic field lines. This unique feature renders them suitable in the development of magnetic-guided, auto-propelled microrobots to serve in target molecule separation and detection, drug delivery, or target cell screening in a microfluidic chip. The biotechnology to couple these bacteria with functional loads to form microrobots is the critical point in its application. Although an immunoreaction approach to attach functional loads to intact MTB was suggested, details on its realization were hardly mentioned. In the current paper, MTB-microrobots were constructed by attaching 2 μm diameter microbeads to marine magnetotactic ovoid MO-1 cells through immunoreactions. These microrobots were controlled using a special control and tracking system. Experimental results prove that the attachment efficiency can be improved to ∼30% via an immunoreaction. The motility of the bacteria attached with different number of loads was also assessed. The results show that MTB can transport one load at a velocity of ∼21 μm/s and still move and survive for over 30 min. The control and tracking system is fully capable of directing and monitoring the movement of the MTB-microrobots. The rotating magnetic fields can stop the microrobots by trapping them as they swim within a circular field with a controllable size. The system has potential use in chemical analyses and medical diagnoses using biochips as well as in nano/microscale transport.     

中国东北地区外来入侵植物的风险评估

通过对野外调查资料和相关文献资料的分析,共确定东北地区外来入侵植物23科95种.在综合分析前人建立的外来入侵物种风险评估方法的基础上,结合东北地区外来入侵植物的实际情况,建立东北地区外来入侵植物的风险评估体系.通过对东北地区外来入侵植物进行风险评估,确定风险等级为A的植物25种,风险等级为B的植物53种,风险等级为C的植物17种.针对各风险等级的外来入侵植物提出防治对策.     

漫谈如何有效提高高中学生语文阅读能力

高中语文教学中,阅读能力教学是重要方面,也是考察高中语文教师教学的重要标尺。在提高高中语文阅读教学方面要做到：激发学生的阅读内驱力;合作探究深入阅读;延伸学生的阅读空间;阅读教学需落实。只有师生共同努力方可有效地完成高中语文阅读教学,提高学生的阅读能力。     

关于“水污染控制工程”国家精品资源共享课建设的思考

国家精品资源共享课是对原有国家精品课程的转型与升级。课程通过现代信息技术构建共享系统,向高校师生和社会学习者提供优质教育资源服务。文章结合水污染控制工程资源共享课的建设经验,指出明确课程定位;从理论教学、实验教学和工程教育几方面完善教学内容;精心组织课程资源;注重师资队伍建设和课程长效管理机制等措施是建设国家精品资源共享课的有效途径。     

Adaptive finite-time control for stochastic nonlinear systems subject to unknown covariance noise

This paper is devoted to the adaptive finite-time control for a class of stochastic nonlinear systems driven by the noise of covariance. The traditional growth conditions assumed on the drift and diffusion terms are removed through a technical lemma, and the negative effect generated by unknown covariance noise is compensated by combining adaptive control technique with backstepping recursive design. Then, without imposing any growth assumptions, a smooth adaptive state-feedback controller is skillfully designed and analyzed with the help of the adding a power integrator method and stochastic backstepping technique. Distinctive from the global stability in probability or asymptotic stability in probability obtained in related work, the proposed design algorithm can guarantee the solution of the closed-loop system to be finite-time stable in probability. Finally, a stochastic simple pendulum system is skillfully constructed to demonstrate the effectiveness of the proposed control scheme.     

Iterative learning control for boundary tracking of uncertain nonlinear wave equations

This work presents a framework of iterative learning control (ILC) design for a class of nonlinear wave equations. The main contribution lies in that it is the first time to extend the idea of well-established ILC for lumped parameter systems to boundary tracking control of nonlinear hyperbolic distributed parameter systems (DPSs). By fully utilizing the system repetitiveness, the proposed control algorithm is capable of dealing with time-space-varying and even state-dependent uncertainties. The convergence and robustness of the proposed ILC scheme are analyzed rigorously via the contraction mapping methodology and differential/integral constraints without any system dynamics simplification or discretization. In the end, two examples are provided to show the efficacy of the proposed control scheme.     

专业学习共同体中教师专业发展研究

随着教师专业发展研究的深入,教师专业发展逐渐引起教育界的普遍关注。本文通过分析专业学习共同体的内涵、特征及其对教师专业发展的价值以揭示专业学习共同体是教师专业发展的理想环境,最后提出专业学习共同体的构建策略。     

对流层风廓线仪探测资料比对分析

本文利用对流层风廓线仪和二次测风雷达的测风实验数据,对其数据处理、统计、比对和分析。结果表明,在低空和高空,二者探测存在一定差值,中间高度具有较好的一致性。     

影响技术并购绩效的关键因素研究

 面对激烈的竞争、快速的技术更新,技术并购已经成为企业提升能力的一种重要方式。那么,技术并购到底有什么作用呢？究竟是什么因素影响企业技术并购的绩效呢？为什么技术并购行为不断增多,失败率却居高不下呢？在这三问题的指引下,基于文献综述,总结了技术并购的重要性,提出了企业技术并购绩效的影响因素之理论框架和研究命题,并为企业成功进行技术并购提出启示性建议。