2维流形上的旋转向量场

本文藉助微分型引入了2维流形上旋转向量的定义且证明了以下定理: 定理3 设X(m,μ),μ∈[0,T],是M上的旋转向量场。那末X(m,μ),μ∈[0,T],不存在单边的周期轨线。定理5 设X(m,μ),μ∈[0,T],是M上的C~1旋转向量场且是X(m.μ_0),μ_0∈[0,T],的一半侧稳定极限环。那末当μ从μ_0向适当方向变化时,X(m,μ)在稳定的那一侧中至少有一单侧稳定极限环和一单侧不稳定极限环。(它们可能重合。) 定理6 设X(m,μ),μ∈[0,T],是M上的C~1旋转向量场且是X(m,μ_0),μ_0∈[0,T],的一半稳环。那末当μ向适当方向变化时至少蜕变为一个稳定环和一个不稳定环,分别位于这半稳环的两侧,而当μ向另一方向变化时消失。文中对一些特殊的2维流形给出了旋转向量场的例子。     

现行量子力学存在的一个突出问题

现行量子力学存在的一个突出问题燕光（内蒙古师范大学物理系，呼和浩特，０１００２２）中图分类号Ｏ４１３·１自量子力学问世７０多年来，对有关该理论的解释、哲学意义的探讨等问题一直进行着有益的争论．其中尤为突出的是量子力学在极限条件下向经典力学过渡的问题．...     

相转移催化法合成ACC

ACC(1—氨基环丙烷—1—羧酸)是一种新型植物生长调节剂。本文报导的是通过相转移催化法以氰乙酸乙酯为原料合成ACC的方法。该法具有反应步骤少、时间短、产率高的特点,是适用于生产的合成路线。     

复式半背斜及其形成的动力学初探

作者于1980年提出了《复式半背斜》术语。根据近年来研究,可以断定,它是一个广泛存在的构造型。它具有一系列特征,如:1.连续发育的褶皱呈束状,褶皱束的中部略向前突出呈一弧形;2.物质水平运动具有明显定向性;3.复式半背斜为一巨型断裂限制,在此断裂的一侧离开限制性断裂的距离越大,复式半背斜所暴露的地层带的年龄就越年轻,在另一侧不存在与复式半背斜相应的地质构造,而出现花岗岩带、地槽褶皱带或古老的基岩,等等。笔者划分出复式半背斜的五种动力学类型:1.重力滑动型;2.深断裂挤压型;3.重力滑动与深断裂挤压复合型;4.早期重力滑动与晚期断裂深部挤压复合型;5.深断裂挤压与重力扩张复合型。     

Application of intervention analysis to a road fatality series in ontario

Effect of an intervention on a road fatality time series is studied using (i) the usual intervention analysis of Box and Tiao (1975), and (ii) CUSUM charts for the one-step-ahead forecast errors. It is shown that the seat belt and speed limit legislations of the Ontario Government had some impact in bringing down the road toll level.     

f(x)~(g(x))的极限及应用

本书阐明 limf(x)~(g(x))在 limf(x)≥0或+∝,limg(x)存在或无穷的前提下,只有1~∞、0~0、+∝~0三种不定型。并说明此结论在简化极限运算中的作用。     

Species-specific differences in the mitogenic activity of heparin-binding growth factors in the sera of various mammals

Sera from different mammalian species displayed great differences in mitogenic activity, as measured by stimulation of DNA synthesis in BALB/c 3T3 cells (3T3 cells). Among the sera examined, fetal bovine serum was least active, and increasing activity was detected in calf serum, human serum, rat serum and mouse serum, in that order. Rat and mouse sera exhibited extremely high mitogenic activity with 3T3 cells, but when TIG-1 human fetal lung fibroblasts were used for the DNA assay instead, the activity levels of all of the sera were lower, and the differences between them were smaller. To determine the reasons for these differences, the heparin-binding growth factors in each serum were separated on a heparin affinity column. Five peaks of DNA-stimulating activity were obtained. Three of these were found in all sera examined, with both 3T3 cells and TIG-1 cells. Two other peaks were found only with 3T3 cells; one was peculiar to rat and mouse sera, with extremely high activity in the rat, and the other was specific to fetal serum. The dependence of the activity of these peaks on the cells used for the test was confirmed using normal rat lung fibroblasts and immortalized rat kidney cells. These findings adequately explain the species-specific differences in mitogenic activity of whole sera, and the variation in activity depending on the cells used for assay of DNA synthesis.     

高温溶液结晶过程的光学研究法(一)——饱和温度和自发成核温度的测定

本文介绍了一套自行设计和组装的、高温热台显微镜实验装置,建立了一套高温溶液饱和点及自发成核温度测定法,测定了 KTP一磷酸盐熔液溶解度曲线和过冷度曲线。饱和温度测定精度在1℃左右。本装置及所介绍的方法,适于某些高温溶液晶体生长的定量实验研究。     

人脐静脉内皮细胞原代培养方法的建立

目的：探索并建立人脐静脉内皮细胞（删Ⅶc）体外稳定培养的方法。方法：以1％Ⅱ型胶原酶消化收集人脐静脉内皮细胞，用嘲加10％的胎牛血清进行培养，免疫细胞化学方法鉴定内皮细胞。结果：原代培养的内皮细胞镜下呈典型的铺路石或者鹅卵石样排列，3～4d时生长最快。5d左右融合；免疫细胞化学染色显示内皮细胞Ⅷ因子相关抗原表达阳性。结论：酶消化法获得的原代血管内皮细胞有较高的存活率，可以作为基础和临床研究的良好模型。