非线性年龄依赖种群分布模型的偏指数增长性

讨论了一类非线性年龄依赖种群分布模型的偏指数增长性，此外还得到了对应的线性模型在测度空间的适应性。     

The range of life in amber: significance and implications in DNA studies

A survey of the major fossiliferous amber deposits is provided, including ages and various categories of life forms reported from each. The frequence of occurrence of the major groups of plants and animals in these amber deposits is also given. Thus far, DNA from four insect and one plant species has been extracted from amber fossils. In the case of the stingless bee in Dominican amber, evidence of reproducibility is provided, since two independent laboratories isolated DNA from six or more different specimens of the same insect.Amber sources for DNA studies are listed together with their advantages and disadvantages. The important points are the availability of desired pieces, the proper identification of the fossil, verification of the amber deposit, the cost involved, and the feasibility of causing damage to the specimen. The availability of several types of amber (Mexican, Dominican, Baltic, Chinese, Canadian, Siberian and Lebanese) at four major sources (academic collections, commercial dealers, private collections and amber mines) is discussed. The scientific implications of obtaining DNA from amber inclusions are presented.     

绕线工艺理论分析

在磁与电转换器件生产中。都会有绕线工艺。绕线工艺已成为电器、电子、仪表生产中重要工序。本文对绕线工艺进行理论分析,建立绕线工艺参数的计算方法,为生产、技术和绕线工艺装备设计,提供理论依据。     

Epidemic Prediction of Hemorrhagic Fever with Renal Syndrome Using Grey Multivariable Model

ＥｐｉｄｅｍｉｃＰｒｅｄｉｃｔｉｏｎｏｆＨｅｍｏｒｒｈａｇｉｃＦｅｖｅｒｗｉｔｈＲｅｎａｌＳｙｎｄｒｏｍｅＵｓｉｎｇＧｒｅｙＭｕｌｔｉｖａｒｉａｂｌｅＭｏｄｅｌＧＥＮＧＪｉａｎｐｉｎｇ（Ｆｉｒｓｔｔｅａｍ，ＦｏｕｒｔｈＭｉｌｉｔａｒｙＭｅｄｉｃａｌＵ...     

两部件并联可修系统解的存在惟一性

用纯分析的方法证明了两部件并联可修系统动态非负解的存在惟一性。     

非均匀内热源组合球壁稳态导热微分方程组的解

用热流分流和叠加，直接得出非均匀内热源组合球壁稳态导热微分方程组，分别在第一类、第二类和第三类边界条件下的解。     

EXISTENCE OF NONTRIVIAL SOLUTIONS FOR CRITICAL SEMILINEAR BIHARMONIC EQUATIONS

ＥＸＩＳＴＥＮＣＥＯＦＮＯＮＴＲＩＶＩＡＬＳＯＬＵＴＩＯＮＳＦＯＲＣＲＩＴＩＣＡＬＳＥＭＩＬＩＮＥＡＲＢＩＨＡＲＭＯＮＩＣＥＱＵＡＴＩＯＮＳ￥ＧＵＹｏｎｇｇｅｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＳｙｓｔｅｍｓＳｃｉｅｎｃｅ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｂｅ...     

抬臀侧卧纠正臀位120例分析

抬臀侧卧纠正臀位简单易行 ,能大大降低臀位发生率 ,降低围产期婴儿的死亡率 ,确保母婴的身体健康。