关于亚纯函数的单充满圆

文中仅涉及亚纯函数的单级零点或极点,证明了亚纯函数的单充满圆存在性定理。     

旋流纺输送管道的形状与尺寸对纱线条干不匀率的影响

圆盘式旋流纺纱是一种新型的纺纱方法,输送管道是旋流纺设备的重要构件之一.以旋流纺输送管道为研究对象,通过对输送管道进行设计、试验与分析,阐明了输送管道的形状与尺寸对所加工纱线条干不匀率的影响.研究结果表明,纱线条干不匀率最小的条件是:输送管道进口面的宽度为22 mm,进口面高度为30 mm,下层面和进口面的夹角为30°,上层面和进口面的夹角为148°,出口圆弧高度为24 mm,出口宽度为9 mm,下层面长度为43 mm.     

低比转速离心泵圆盘损失的计算

准确计算圆盘损失的大小是预测低比转速离心泵性能的重要因素.在泵试验结果的基础上,借助流体动力计算的数值计算和模拟方法,采用RNGk-ε湍流模型封闭时均N-S方程组,以低比转速离心泵M23-12.5为对象,在假定圆盘摩擦损失只增加轴功率而不影响液体有效能量增加的基础上,通过泵的数值预测结果和实验性能曲线的对比,对3种圆盘摩擦损失的计算方法进行比较.结果表明与直接计算叶轮外圆直径的摩擦力矩作为整个泵的圆盘摩擦损失的方法相比,根据泵叶轮的形状,分别计算其前后盖板的摩擦力矩进而求得叶轮圆盘损失的方法,更适合低比转速离心泵叶轮圆盘损失功率的计算.     

基于广义最大周向应变准则的断裂特性研究

裂纹尖端应力场的非奇异性常数项(T应力)对脆性或准脆性材料的断裂特性及裂尖塑性区的形状和大小都有显著的影响.为了探究T应力对脆性或准脆性材料Ⅰ～Ⅱ复合型断裂特性的影响规律,基于先前研究中提出的计及T应力影响的广义最大周向应变准则进一步讨论了T应力、裂纹尖端的临界距离r0和泊松比y对中心裂纹圆盘试件的裂纹扩展路径以及临界...     

具有迁移性质的Ross Macdonald系统的格子Boltzmann方法

用格子Boltzmann方法研究描述疟疾病疟蚊系统的具有迁移性质的Ross Macdonald方程, 先构建Ross-Macdonald方程的格子Boltzmann模型, 再用该模型对疟疾病疟蚊系统进行数值模拟, 并将格子Boltzmann方法与有限差分方法的数值解进行比较. 结果表明, 该方法可用于模拟疟疾病疟蚊系统.     

Replication pattern of double minutes derived from an insect cell line

Summary The DNA replication pattern of double minutes derived from an established cell line ofAedes albopictus is described. Although the vast majority of double minutes replicate semiconservatively once during the S phase, some double minutes appear to exhibit different pattern(s). Two theories are suggested as possible explanations of our findings.This work was supported by a grant from the Whitehall Foundation, Inc. awarded to A.B.M.     

Purification and characterization of aβ-glucosidase (linamarase) from the haemolymph ofZygaena trifolii Esper, 1783 (Insecta,Lepidoptera)

Summary A -glucosidase (linamarase) was purified 52-fold with a recovery of 27% from the haemolymph of the larvae ofZygaena trifolii, ESPER, 1783 (Lepidoptera, Zygaenidae). The final enzyme preparation was found to be nearly homogeneous on both disc polyacrylamide gel electrophoresis and SDS-polyacrylamide gel electrophoresis. The molecular weight of the enzyme was determined to be about 130 kDa; it consisted of two subunits of about 66 kDa. The enzyme showed an optimum between pH 4.5 and 5 with linamarin and a broad optimum between pH 3.5 and 6.5 for p-nitrophenyl--D-glucoside; the temperature optimum was 40°C. The -glucosidase showed a high specificity for its endogenous substrates linamarin and lotaustralin. Among the other natural and artificial substrates tested, only prunasin and p-nitrophenyl--D-glucoside were hydrolyzed by the enzyme, whereas linustatin, salicin, cellobiose and trehalose were not. The enzyme is strongly inhibited by -glucosylpiperidine.     

关于亚纯函数的单充满圆

本文继续关于亚纯函数的单充满圆一文的研究,证明了亚纯函数的单充满圆存在性(?)理,应用它可以把庄圻泰著的亚纯函数的奇异方向一书的第五章全都定理和系理变成单级极点的情况,无穷级情况易由voliron角域不等式得到,我们仅就有穷正级、零级情况讨论之。