转制科研单位建立和完善内部会计控制的探讨

针对目前大多数科研单位在内部会计控制中存在的问题,根据财政部颁布的《内部会计控制规范一基本规范》,探讨了科研单位在转制过程中应如何建立和完善内部会计控制制度,以达到防范经营风险,保护资产安全、完整,确保经营管理目标和政策有效实施.     

云南省水环境状况及问题分析

根据2000年云南省主要河流水质监测评价结果，全省评价河段总长9280km中，水质为Ⅰ－Ⅲ类的河长占76．3％，总体上，云南省内各大水系水质良好，但水污染总体上正在加重，从1985－2000年，Ⅰ类河长年均减少2．3％，V类河长年均增长0．6％，废污水直接排入江河是引起污染的重要原因。水环境问题已成为社会经济可持续发展的关键问题，要切实加强水资源的保护，科学地开发利用水土资源，为了有效地改善水环境的质量，污染控制应从源头开始并采取综合治理措施。     

电子封装用金属基复合材料的制备

分析了电子封装用金属基复合材料的性能特点及其对制备工艺的要求，在此基础上论述了该种材料的各种制备工艺的特点及发展现状。     

Shear ductility and toughenability study of highly cross-linked epoxy/polyethersulphone

The objective of the present study was to determine whether the ductility and toughenability of a highly cross-linked epoxy resin, which has a high glass transition temperature, T _g, can be enhanced by the incorporation of a ductile thermoplastic resin. Diglycidyl ether of bisphenol-A (DGEBA) cured by diamino diphenyl sulphone (DDS) was used as the base resin. Polyethersulphone (PES) was used as the thermoplastic modifier. Fracture toughness and shear ductility tests were performed to characterize the materials. The fracture toughness of the DDS-cured epoxy was not enhanced by simply adding PES. However, in the presence of rubber particles as a third component, the toughness of the PES–rubber-modified epoxy was found to improve with increasing PES content. The toughening mechanisms were determined to be rubber cavitation, followed by plastic deformation of the matrix resin. It was also determined, through uniaxial compression tests, that the shear ductility of the DDS-cured epoxy was enhanced by the incorporation of PES. These results imply that the intrinsic ductility, which had been enhanced by the PES addition, was only activated under the stress state change due to the cavitation of the rubber particles. The availability of increasing matrix ductility seems to be responsible for the increase in toughness. This revised version was published online in November 2006 with corrections to the Cover Date.     

高炉鼓风机就地扩容改造方案及经济效益

介绍了利用高炉鼓风机基础实施不易地扩容改造的设计工艺方法，该方法不仅降低了设计、施工、安装费用，而且缩短了施工周期，降低了固定资产投资。     

Call admission control schemes under generalized processor sharing scheduling

Provision of Quality‐of‐Service (QoS) guarantees is an important and challenging issue in the design of integrated‐services packet networks. Call admission control is an integral part of the challenge and is closely related to other aspects of networks such as service models, scheduling disciplines, traffic characterization and QoS specification. In this paper we provide a theoretical framework within which call admission control schemes with multiple statistical QoS guarantees can be constructed for the Generalized Processor Sharing (GPS) scheduling discipline. Using this framework, we present several admission control schemes for both session‐based and class‐based service models. The theoretical framework is based on recent results in the statistical analysis of the GPS scheduling discipline and the theory of effective bandwidths. Both optimal schemes and suboptimal schemes requiring less computational effort are studied under these service models. The QoS metric considered is loss probability. This revised version was published online in June 2006 with corrections to the Cover Date.     

大化水电站通航建筑物型式的再研究

本文较详细介绍了大化通航建筑的研究过程并针对大化水电站的现状，论证分析了大化水电站升船机改型为船闸的可能性，技术上的优越性和经济上的合理性，是较好的合理化建议文章。     

4×622Mb／sWDM40km光通信系统实验

本文完成了我国第一个４×６２２Ｍｂ／ｓ波分复用（ＷＤＭ）光通信系统实验，使单根光纤线路通信容量达２．４Ｇｂ／ｓ。该系统以ＤＦＢ－ＬＤ为光源，工作波长在１．５５μｍ附近，ＬＤ的工作频率稳定度优于±１５０ＭＨｚ，信道间隔２ｎｍ左右，无中继传输距离为４３．６ｋｍ，采用Ｆ－Ｐ调谐光滤波器作为解复用器，接收机灵敏度达－３０ｄＢｍ。     

As压对LT-GaAs/AlGaAs多量子阱光学特性的影响

在衬底温度为 3 5 0°C的条件下 ,用分子束外延的方法 ,在不同的砷压条件下生长了 Ga As/Al0 .3Ga0 .7As多量子阱结构。 77K的荧光实验证明 ,砷压对样品的光学特性影响显著。认为砷压对低温多量子阱光学特性的影响是点缺陷随砷压的演化和能级间相互补偿的共同结果。通过优化砷压 ,样品的荧光峰的半峰宽减小到 3 me V,这是到目前为止所报道过的最窄的低温多量子阱的荧光峰。相应的垂直场光折变器件的电吸收为 60 0 0 cm     

Bright Blue Light—emitting Diodes Based on a Novel Fluorescent Dye Containing Heterocyclic Groups

Novel molecular material ,1-benzothiazoly-3-pheny1-pyrazoline (BTPP) was found to function as bright blue light emitting dye in organic electroluminescent device, and its optical and electric characteristics were investigated. This heterovyclic compound exhibited good characteristics of blue photoluminescence and electroluminescence,which had the emission peak at 450nm .The single layer light-emitting devices using BTPP as light -emitting material dispersed in poly(N-vinylcarbazole)(PVK) and double layer ones using PBD as hole block layer above the light-emitting layer were fabricated using conventional spin-casting and vaccum vapour deposition methods. The introduction of PBD has enhanced electron injection and luminance efficiency, compared with the single layer LEDs.