Chemical Modification of Silk Fibers with Ethylene Glycol Dimethacrylate

Silk fibers have been grafted with ethylene glycol dimethacrylate (EGDMA) and characteristics of the grafted silk fibers were analyzed in relation to the graft yield on the basis of the tensile properties, dyeing behaviour, durability during laundering and solubility of the specimen in NaOH solution. The amount of the acid dye absorbed by the fibers decreased with increasing graft yield, while the value of rating for washing fastness on silk fibers was almost unchanged by the graft treatment The breaking loads of the fiber were almost unchanged whereas rigidity of the fibers increased after graft treatment. Graft treatment enhanced silk fiber durability during laundering and in NaOH solution.     

Isolation of Microorganisms Capable of Synthesizing Novel Biopolymers from Oil Contaminated Soil and Water

ＩｎｔｒｏｄｕｃｔｉｏｎＰｏｌｙｈｙｄｒｏｘｙａｌｋａｎｏａｔｅｓ（ＰＨＡｓ）ａｒｅｂｉｏｐｏｌｙ－ｍｅｒｓｓｙｎｔｈｅｓｉｚｅｄｂｙｍａｎｙｂａｃｔｅｒｉａ．Ａｆｔｅｒｔｈｅｄｅｔｅｃｔｉｏｎｏｆｐｏｌｙｈｙｄｒｏｘｙｂｕｔｙｒａｔｅ（ＰＨＢ）,ａ...     

两性物质溶液精确［H＋］计算的新公式和迭代判据（Ⅱ）

本文提出了计算酸式盐和ＭＢ型弱碱弱酸盐溶液［Ｈ＋］精确解的新公式和迭代判据，一般迭代１～２次便可求出［Ｈ＋］的精确解     

基于网格的协同仿真设计

介绍了网格和高层体系结构(high level architecture,HLA)的相关概念,探讨了基于网格的HLA协同仿真特点。提出了基于网格的协同仿真设计的体系结构,并将该结构分为三个层次,可有效管理和组合各仿真子系统及共享资源,较大地提高了仿真系统的开发效率。最后初步规划了协同仿真的过程并设计了编程模型,可使仿真平台具有良好的兼容性和扩展性。     

Microbial Transformation of Acetophenone to 2—Phenylethanol

Microorganisms are commonly used to transform chemicals to chiral compounds. Pseudomonas cepacia 1813, Pseudomonas stutzeri 1317, Saccharomyces cerev isiae 1912, and 5 Escherichio coil strainswere used to transform acetophenone to 2-phenylethanol. The results show that the E. coli strains have the poorest biotransformation ability. P. stutzeri 1317 provides the best transformation ability with a transformation rate of 30% achieved with either whole or broken P. stutzeri 1317 cells for a reaction pH of 8. 2 and an initial acetophenone concentration of 2 g/L. An acetophenone concentration of 10 g/L strongly inhibits the biotransformation for a pH of 8. 2. Crude alcohol dehydrogenase obtained from S. cerevisiae 1912 transforms acetophenone to 2-phenylethanol when nicotinamide adenine dinucleotide reduced (NADH) is added.     

两性物质溶液精确[H^＋]计算的新公式和迭代判据（II）

本文提出了计算酸式盐和ＭＢ型弱碱弱酸盐溶解［Ｈ＾＋］精确解的新公式和迭代判据，一般迭代１￣２次便可求出［Ｈ＾＋］的精确解。     

基于主动视觉的测量装置精度校准方法

针对工业在线监测对测量装置精度及稳定性的要求,对视觉测量装置精度校准及维护方法进行研究。分析透视原理下引入图像畸变的测量装置成像模型,推导测量装置相对基准激光做直线运动时光斑在畸变图像中的轨迹方程,提出一种基于主动视觉的测量装置精度校准方法:首先,通过控制测量装置做二维平移运动得到校准所需的特征点信息;接着,利用光斑的畸变轨迹方程求解测量图像的畸变系数并对图像进行畸变校正;最后,求解图像平面到被测平面的单应性矩阵从而完成精度校准。对特征点的布置方式进行优化。研究结果表明:校准后的定位测量峰值误差为0.373像素,均方根误差为0.178像素。该方法精度较高且易于实施,能满足工业在线检测的要求。     

汽车转向节锻造成形工艺的有限元分析

文章提出了卡车转向节卧式-火锻造成形新工艺,基于刚粘塑性有限元理论,对转向节的一火锻造成形的各个工序建立了三维热力耦合有限元模型;利用大型有限元分析软件对各成形过程进行数值模拟,优化得出制坯的合理毛坯形状和尺寸、预锻及终锻金属流动过程、应变分布和载荷-行程曲线分布;数值模拟结果与实验结果吻合,数值模拟为工艺制定和模具设计提供了可靠的理论依据.     

水稻抛秧氮肥合理施用量探讨

近年来,随着水稻抛秧技术的日趋成熟,西湖区水稻抛秧面积迅速扩大,为探明水稻在抛栽条件下高产高效的经济施氮量,于1998～1999年间通过对不同氮肥施用量的氮肥效益及产量影响的研究,对氮肥的经济合理施用量进行了初步探索,为水稻在抛栽条件下科学、合理、经济地施用氮肥提供了一定的理论依据。1材料与方法1.1供试品种双季抛秧早稻为嘉早935,晚稻为丙93-390;单季晚稻抛秧为丙96-42。以上品种均为嘉兴市农科所育成的杭嘉湖地区推广面积较大的品种。1.2试验地点与土壤条件试验地点选在西湖区袁浦镇袁家浦村大汪畈内,地力较高,土壤为…     

Biosynthesis of Polyhydroxyalkanoates Consisting of Short-chain-length Monomers and Medium-chain-length Monomers by Pseudomonas YS1

ＩｎｔｒｏｄｕｃｔｉｏｎＰｏｌｙｈｙｄｒｏｘｙａｌｋａｎｏａｔｅｓ(ＰＨＡｓ)ａｒｅａｆａｍｉｌｙｏｆｂｉｏｐｏｌｙｅｓｔｅｒｓｙｎｔｈｅｓｉｚｅｄｂｙｍａｎｙｂａｃｔｅｒｉａ[1,2 ] .ＡｍｏｎｇＰＨＡｓ ,ｐｏｌｙｈｙｄｒｏｘｙｂｕｔｙｒａｔｅｏｒＰＨＢｉｓｔｈｅｍｏｓｔｃｏｍｍｏｎｍｅｍｂｅｒ[3] .ＡｔｔｅｍｐｔｓｈａｖｅｂｅｅｎｍａｄｅｔｏｄｅｖｅｌｏｐｃｏｍｍｅｒｃｉａｌｆｅｒｍｅｎｔａｔｉｏｎｐｒｏｃｅｓｓｅｓｆｏｒｔｈｅｐｒｏｄｕｃｔｉｏｎｏｆＰＨＡｓ[4 7] .Ｂｉｏｐｏｌ,ａｃｏｍｍｅｒｃｉ…