自组织生长纳米半导体量子点的研究进展

纳米半导体量子点以其所具有的新颖光电性质与输运特性 ,正在成为量子功能器件研究中的一个热点领域 .作为纳米量子点的制备方法 ,自组织生长技术正在受到人们的普遍重视 .而如何实现具有尺寸与密度可控纳米量子点的自组织生长 ,更为材料物理学家所广泛关注 .因为这是由自组织方法形成的纳米量子点最终能否实现器件实用化的关键 .本文将以纳米量子点→自组织生长→形成机理→尺寸与密度可控为主线 ,简要介绍近 1 0年来纳米量子点自组织生长技术的研究进展 .     

极低频磁场的生物学效应

极低频磁场的生物学效应是当前国际上关注的研究热点 .本文介绍了极低频磁场生物学效应的物理原理及实验研究 ,并综述了极低频磁场对中枢神经的影响以及在临床上的应用 .     

Study on Technologies of Hydrogen Production and Hydrogen Power System Based on Renewable Energy

Integrating the hydrogen production technologies from renewable energy with the advanced distributed hydrogen power systems has being become an important development trend of energy science and technology in the twenty-first century, since it may satisfactorily solve such problems met in the utilization of renewable energy as low density, instability, discontinuity and changing with time, season and climate. In this paper, the status and prospect of studies on hydrogen production theories and technologies from renewable energy especially the photocatalytic water splitting and the thermochemical catalytic gasification of biomass in supercritical water are commented on, and some new suggestions to build up novel hydrogen energy power system based on renewable energy are put forward.     

Feedforward and feedback optimal control for linear time-varying systems with persistent disturbances

1 .INTRODUCTIONIn nature ,there are various external disturbancesaffecting the performances of systems . Many con-trol problemsinvolve designing a controller capableof stabilizing a given linear system while mini mi-zing the worst-case response to some additive dis-turbances . This problemis relevant to disturbancerejection and cancellation. One application area ofinterest is flight control through wind shear ,where disturbances arise from a modal for windshear based on harmonic oscillati…     

Behavior Model Construction for Client Side of Modern Web Applications

Most of the behavior models with respect to Web applications focus on sequencing of events,without regard for the changes of parameters or elements and the relationship between trigger conditions of events and Web pages.As a result,these models are not sufficient to effectively represent the dynamic behavior of the Web2.0 application.Therefore,in this paper,to appropriately describe the dynamic behavior of the client side of Web applications,we define a novel Client-side Behavior Model(CBM) for Web applications and present a user behavior trace-based modeling method to automatically generate and optimize CBMs.To verify the effectiveness of our method,we conduct a series of experiments on six Web applications according to three types of user behavior traces.The experimental results show that our modeling method can construct CBMs automatically and effectively,and the CBMs built are more precise to represent the dynamic behavior of Web applications.     

模糊偏好下社会选择问题的研究

本文研究和探讨了社会选择中的模糊偏好，在一组模糊理性条件下证明了一个不可能性定理，并将其中的独裁者区分为一般、α－和完全三种，分析了这些独裁者与偏好传递性间的关系，在一特殊传递性下还找到了一个存在α－独裁者或完全独裁者的模糊集结规则．最后，给出了一个应用例子     

用光学方法减弱导弹尾焰对可见光TV制导影响的研究

导弹发射初期尾喷焰及其烟雾对可见光TV参与全程制导的图像处理有严重影响,它是一个明显的覆盖物,研究表明,用光学方法加上图像处理技术可以减弱其影响,排除干扰,达到对双目标即飞机与导弹进行有效的跟踪与制导要求,从而较好地提高了TV制导抗干扰性能及参与全程制导独立作战的能力,无疑必然提高复合光电武器大系统的高附加值。     

合并类综合大学中师范教育的现状及发展

文章主要对合并类综合大学办师范教育与传统师范大学办师范教育的优势、不足进行了比较,并就其进一步发展策略提出了自己的建议.     

连续梁施工技术

介绍山西晋济高速公路连续刚构桥施工.采用双肢联体挂篮施工T构梁段,在0#梁段上拼装双肢联体挂篮.对称悬臂施工大跨、整幅、斜腹板箱梁.包括双肢联体挂篮的设计、加工与安装和混凝土施工工艺,为同类工程提供借鉴.     

浅淡人工影响天气

人工影响天气是深受地方政府和老百姓欢迎的一项公益事业,但是人工影响天气是需要具备一定的条件的,不是什么样的天气条件都可以做.文章主要通过对人工影响天气作业项目、作业条件、作业方法及其产生的影响和发展状况加以说明,使大家对人工影响天气有进一步的了解.