γ-环状糊精生产用菌的筛选及初步鉴定

通过对新疆吐鲁番葡萄沟的土壤中所筛选到的一株芽孢杆菌32－3－10进行研究，认为其环状糊精葡萄糖基转移酶（cyclodextrin glucosyltransferase,CGT酶）作用于马铃薯淀粉后，生成的环状糊精产物主要为γ－环状糊精（γ－cyclodextrin，简称γ－CD），可以作为工业生产γ－CGTase的出发菌株。     

Controllable fabrication of Au micro/nanostructures on self-doped polyaniline nanofibers via electrochemical deposition and its application for DNA immobilization

Four electrochemical methods, cyclic voltammetric deposition, potentiostatic electrodeposition, multi-potential step electrodeposition and three-step electrodeposition, were used to fabricate Au micro/nanostructures on self-doped polyaniline nanofibers-coated glassy carbon electrodes (Au/nanoSPAN/GCEs). The Au micro/nanostructures deposited on the nanoSPAN-modified electrodes were shown by scanning electron microscopy to exhibit different morphologies, such as Au nanoparticle clusters, monodisperse nanoparticles and homogeneously dispersed flower-like microparticles, depending on the deposition method. This phenomenon demonstrates that control over the morphology of Au metal can be easily achieved by adjusting the electrodeposition method. The electrochemical behaviors of the Au/nanoSPAN/GCEs also varied with above four methods, which were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. In comparison with Au nanoparticle clusters and monodisperse Au nanoparticles, homogeneously dispersed flower-like Au microparticles had the largest surface area and obviously enhanced electrochemical response towards the redox reactions of [Fe(CN)₆]^3?/4? on the modified electrode. DNA immobilization on the Au/nanoSPAN/GCEs was investigated by differential pulse voltammetry using [Fe(CN)₆]^3?/4? as an indicator. The efficiency of DNA immobilization was inherently related to their different Au micro/nanostructure morphologies. The Au/nano-SPAN/GCE fabricated by three-step electrodeposition showed the largest capacity for immobilization of single stranded DNA, which makes it a promising DNA biosensor.     

An Investigation of Stimulating the Autoclave Curing Process of Resin Matrix／Fiber Reinforced Composite Material, Ⅰ ： Process model

A mathematical model is made which describes the curing process of composites constructed from continuous fiber-reinforced, thermosetting resin matrix prepreg materials, and the consoli-dation of the composite is developed. The model provides the variation of temperature distribu-tion, the entre reaction process in the resin, the resin flow and fibers stress inside the composite,and the void variation and the residual stress distribution. It can be used to illustrate the mecha-nism of curing process and optimize the cure cycle of composite material in order to ensure the quality of a product.     

旋转填充床中柠檬酸钠法烟气脱硫的实验研究

以柠檬酸-柠檬酸钠缓冲溶液作为吸收液,在旋转填充床中进行模拟烟气中SO₂（体积分数约为0.4%）的吸收实验,考察了各操作条件对脱硫率的影响。实验结果表明：脱硫率随转子转速、液气比的增大而逐渐增大,但均是达到某一值以后基本不再增加;吸收液的初始pH值越大、温度越高、柠檬酸钠浓度越大,则脱硫效果越好。旋转床中柠檬酸钠法烟气脱硫的适宜工艺条件为：旋转填充床转速1200r/min,液气比8~12L/m^₃,吸收液的初始pH值4.5～5.0,柠檬酸钠浓度0.6mol/L。     

I-fuzzy拓扑空间中的pre-分离性的研究

目的 讨论I-fuzzy拓扑空间中的pre-分离公理.方法利用连续值逻辑语义的方法.方法 利用连续值逻辑语义的方法.结果 首先在I-fuzzy拓扑空间框架下引入了I-fuzzy pre-开集、I-fuzzy pre-重域及I-fuzzy pre-闭包等概念,进而在I-fuzzy拓扑空间中讨论了I-fuzzy pre-分离性.结论 得到了I-fuzzy pre-分离性和一些它们的等价命题.     

酸性介质中黄铜表面缓蚀研究

本文研究了复合型缓蚀剂通过多种组分的协合作用抑制黄铜表面在酸性介质中腐蚀的情况,并用多种物理化学方法进行了检测。经工业应用,收到了良好效果。     

以经济为基础的图书出版种数预测模型研究及完善

分析了当前图书出版种数预测模型存在的缺陷,以经济基础决定上层建筑和哈佛学派实证研究的SCP理论为基础,结合回归分析和概率学的数理方法,提出了以经济因素为自变量的预测模型以及利用预测置信度的概念修正预测结果的表达方式。     

高速铁路绝缘轨距块用增强尼龙专用料研究

以尼龙(PA)为基体树脂,通过不同黏度的PA复合,优化选择了具有较好加工性能和机械强度的基体材料。同时,选择不同直径的玻璃纤维,研究玻璃纤维种类和含量对复合材料性能的影响,对比普通玻璃纤维和无碱玻璃纤维对复合材料的耐醇解性能影响,使复合材料具有优异的耐高温性能和较好的耐醇解性能。为了提高抗氧剂的物理损耗性能,制备了纳米二氧化硅表面负载抗氧剂,并采用红外光谱法研究了接枝结构。     

克隆整合在糙花箭竹补偿更新中的作用

克隆整合是克隆植物在遭受采食干扰后特有的补偿生长机制。糙花箭竹(Fargesia scabrida Yi)是大熊猫主食竹的一种,为研究克隆整合在该物种分株种群补偿更新中的作用,设置了不剪除和剪除25%、50%、75%等4种模拟采食强度的糙花箭竹样方,并对样方四周根状茎进行了切断、不切断处理。实验结果表明：1)切断根状茎连接使得出笋提前,并且出笋受切断根状茎和剪除强度的交互作用影响。2)除根状茎连接时剪除25%处理后补充率显著低于不剪除样方外,不论根状茎连接还是切断,糙花箭竹均能通过补偿生长消除剪除25%和50%的负面影响。剪除75%处理后,切断根状茎连接时出笋率和补充率显著高于不剪除样方,根状茎连接时恰好相反;新生分株的株高、基径和单株生物量不论根状茎连接还是切断均显著低于不剪除样方。3)与保持根状茎连接时相比,切断根状茎连接降低了不剪除样方的出笋率、补充率和新生分株的生长,但增加了剪除75%处理下的出笋率和补充率。因此,糙花箭竹能够通过补偿生长耐受25%和50%强度的采食干扰,75%强度的采食干扰显著降低了新生分株的生长能力以及根状茎连接时的出笋率和补充率,但刺激了切断根状茎后的出笋。研究提示克隆整合对糙花箭竹新生笋的萌发和生长具有重要的支持作用,但并不是补偿生长过程中主要的补偿机制。
     

A new improvement of TCP based on adaptive filtering

On the basis of studying the standard TCP retransmission mechanism,this paper proposes a method to adopt the theory of adaptive filtering in the field for the estimation of round trip time (RTT).Then t...