热挤压变形力计算的研究

本文考虑到变形区内切应力非线性分布的特点,采用球坐标系下的平衡微分方程和塑性条件联立求解,得出圆棒热挤压时变形区入口球面上的应力分布方程,然后应用功平衡法导出了圆棒热挤压力的计算公式。     

Effect of Si/Fe ratio on the boron and phosphorus doping efficiency of β-FeSi2 by magnetron sputtering

Boron-doped or phosphorus-doped β-FeSi₂ thin films have been prepared on silicon substrate by magnetron sputtering. Effects of Si/Fe ratio on the boron and phosphorus doping efficiencies have been studied from the resistivities of doped β-FeSi₂ thin films and current-voltage characteristics of doped β-FeSi₂/Si heterojunctions. The experimental results reveal that the carrier concentration and doping efficiency of boron or phosphorus dopants at the Fe-rich side are higher than that at the Si-rich side. The effect of Si/Fe ratio can be deduced from the comparison of the formation energies under two extreme conditions. At the Fe-rich limit condition, the formation energy of boron or phosphorous doping is lower than that at the Si-rich condition. Therefore, the activation of impurities is more effective at the Fe-rich side. These results demonstrate that the boron-doped and phosphorous-doped β-FeSi₂ thin films should be kept at the Fe-rich side to avoid the unexpected doping sites and low doping efficiency.     

连续混炼过程比能耗分析

将连续混炼过程的有效比能耗分为升温、混炼、脱挥和建压比能耗,并提出了计算各项的一种方法。用该方法对不同机型、不同规格、不同加工对象的连续混炼机的比能耗进行了分析。结果表明,在多数连续混炼过程中,升温比能耗在总有效比能耗中所占比例都较大,建压比能耗所占比例都很小;原料热物性是影响有效比能耗及其构成的根本因素;当原料和混炼产物质量确定时,连续混炼机的螺杆与机筒结构、螺杆直径、产量、混炼工艺等都会影响有效比能耗及其构成。     

国家潮流能试验场选址决策指标体系与分析方法

国家潮流能试验场是潮流能开发利用技术领域的海上公共试验与服务平台。目前国内尚没有海上试验场的建设经验,系统的选址决策标准仍处于空白阶段。本文在对与试验场建设相关的影响因素进行分析与归纳总结的基础上,提出了国家潮流能试验场选址决策的指标体系和分析方法。通过选址方法的研究,对丰富完善国家海洋能试验场标准体系、加快推进国家海洋能试验场建设具有重要意义。     

Application of Magnetron Sputtering in Fabricating MEMS Microbatteries

With the development of MEMS and the electronic devices's miniaturization and integration, a new kind of power sources that can satisfy the need for high energy density is required. Microbatteries are being researched abroad for their advantages of extreme thinness and long-term power supply. The development of MEMS microbatteries are reviewed and suggestedmagnetron sputtering in fabricating a high-performance microbattery. The technics as annealing are analyzed. The microbattery with a LiNi1-x Cox O2 cathode exhibited stable cycle ability and a high specific discharge capacity, which was attributed to the alloying effect of the LiNiO2and LiCoO2.     

Energy transfer in and fluorescence studies of the Eu-Tb doped BPA-phen system

To enhance the red emission efficiency of Eu³⁺ complexes, [Eu/Tb_x(BPA)₃phen] (BPA?=?bisphenol A, phen?=?1,10-phenanthroline) is designed and synthesized. The complexes are characterized fully and their luminescence properties are evaluated. Co-fluorescence is detected in the Eu/Tb_x(BPA)₃phen complexes, and the existence of Tb³⁺ enhances the luminescence intensity of the central Eu³⁺ because of the intramolecular energy transfer from the ⁵D₄ level of Tb³⁺ to the ⁵D₀ level of Eu³⁺. The luminescence intensity of europium ions at 615?nm is the highest for Eu/Tb₁(BPA)₃phen. To improve the thermal stabilities and mechanical properties of pure complexes, Eu/Tb₁(BPA)₃phen/PAN (PAN?=?polyacrylonitrile) is used to fabricate fibres by electrospinning. Compared with Eu/Tb₁(BPA)₃phen (τ?=?1.1087?ms), the fibres have a longer fluorescence lifetime of 1.533?ms. The fibres also retain a high quantum yield of 47.16%. Thus, the flexible luminescent fibres have potential applications in many fields.     

多孔材料缓冲吸能特性表征方法

分析了多孔材料缓冲吸能机理，综述了多孔缓冲材料吸能特性的几种表征方法：缓冲曲线、缓冲系数、Janssen因子、Rusch曲线、能量吸收率曲线和能量吸收图，并分析了各种表征方法的优缺点。能量吸收图汇集了应变率和材料结构特征等信息，且能够模型化，对于不同密度多孔材料吸能特性的表征具有一定的普适性。     

电力行业的循环经济模式

分析了我国电力工业现状,指出我国电力工业受到能源和环保的双重压力,走循环经济模式是电力行业的必由之路。提出了电力工业发展走循环经济的措施,即调整电力结构、合理利用资源、加强综合利用、强化污染物控制等。     

大型超市能耗动态模拟研究

建立了大型超市能耗动态模拟的计算模型。以上海某大型超市为例,应用DeST软件模拟和实际调研分析相结合的方法,对该大型超市的全年逐时能耗进行了模拟,并利用模拟结果分析了该大型超市的能耗现状和结构。利用该建筑实测能耗数据对模拟结果进行了验证,表明该计算模型准确合理。     

亚海水淡化技术处理滩涂水的中试

采用亚海水淡化技术对滩涂水库水淡化,建立了2m^3/h的试验工程,试验过程中对水温、吨水电耗、进水TDS、产水TDS等指标的相关性进行了研究。试验结果表明,滩涂水含盐量约为海水的1／10,在水温大于13℃时,吨水电耗低于2．5kWh,产水含盐量一般在200mg／L以内,出水水质达到国家生活饮用水卫生标准。