I-I型易溶盐溶度积的探讨(Ⅱ)

定量地研究了I-I型易溶盐的溶度积。研究了"代溶剂效应"和活度效应对该溶度积的影响。     

异步电动机精确圆图几何作图法

本文根据异步电动机的有关参量,运用几何作图的方法,给出了异步电动机的精确圆图。     

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     

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.     

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。     

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

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

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。     

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…     

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.