解Fuzzy关系方程。■=

本文将给出有限论域U、V上的Fuzzy关系方程。■==a_1,a_2,…,a_n)∈U,=(b_1,b_2,…,b_n)∈V)有解的充要条件,有最小解的充要条件以及极小解个数等几个定理。本文所采用的符号与[1]的符号一致。     

用数学书写的墓碑和遗嘱

古往今来,大概只有数学家的墓碑上不是长篇传记,而是用言简意赅的数学(数字,图形,题目等)来表达的.这些简单的图形或数,不仅歌颂他们光辉的一生,而且还表达了他们执着的追求和闪光的业绩.这些遗嘱有的成为数学名题,有的成为数学故事.     

Quasielastic Scattering of the Halo Nucleus ^6He at 25 MeV／u from a ^9Be Target

The differential cross sections of quasielastic scattering of a 25 MeV/u ^6He from ^9Be target have been measured.The double-folding model approach is applied to generate the real part of the optical potential. The imaginary potential parameters as well as some of the real potential parameters are studied in comparison with the experimental data. The effect of the unstable nucleus is discussed.     

稳态锁模产生4ps激光脉冲

首次利用ＧａＡｓ光电导开关，控制Ｎｄ：ＹＬＦ激光器腔内Ｑ值，实现稳态锁模，获得脉宽和能量稳定性极高的４ｐｓ激光脉冲。     

拟协调元的精度分析

利用双参数有限元的框架，证明利用拟协调元方法构造的非协调三角形板元都具有一个非常特殊的性质。即相容误差比插值误差高一阶。这是常规有限元和一般非协调元所不具备的。     

Riccati方法与微分方程的渐近积分

考虑二阶常微分方程x″ f(t)x=0,t≥a,(1)假设应用Riccati方法得到方程(1)的主解(principal solution)的一个渐近积分并研究其副解(nonprincipal solutions)的三种不同的渐近性质.主要结果如下:定理1 若(Ⅰ)成立,则方程(1)有解x_1满足及另一解x_2满足x_2(t)=t[1 o(1)]. 反之,若方程(1)有解x(t)→1,t→∞,则(Ⅰ)成立. 定理2 设(Ⅰ)成立.(i)若(Ⅱ)成立,则方程(1)有解x_2使x_2’(t)=1 [tF(t) G(t)][1 o(1)] o(1). (ii) 反之,若方程(1)有解x使x’→1,t→∞,则(Ⅱ)成立. 定理3 若(Ⅲ)和(Ⅳ)成立,则方程(1)有解x_1满足(2)及解x_2满足     

海螵蛸入药部分和废弃部分8种无机元素分析

为合理开发利用海螵蛸 ,用原子吸收分光光度法测定了海螵蛸中入药部分和废弃部分中8种人体必需无机元素含量。结果表明 ,入药部分和废弃部分中钙含量丰富 ,分别达到 742 1 3× 1 0 - 3和 65 9 76× 1 0 - 3。入药部分铜、铁含量较废弃部分高 ,分别为 9 41× 1 0 - 6 、 91 86× 1 0 - 6 和2 3 5× 1 0 - 6 、 2 5 7× 1 0 - 6 。废弃部分含锌丰富 ,为 3 5 3 62× 1 0 - 6 ,数倍于入药部分 64 65× 1 0 - 6 。可见海螵蛸入药部分和废弃部分均具有良好的开发前景     

南海东北部沉积类型的分布规律

本文以沉积物的粒度类型为基础,结合沉积物的生物、矿物、化学组成的特征,从沉积物的成因观点综合分析,把本区沉积物分为陆源碎屑沉积(含五个沉积物带)、生源-陆源沉积(含三个沉积物带),自生-陆源沉积(含某些自生沉积矿物)和火山-陆源沉积(含某些火山碎屑物)等四种沉积类型,并论述了各类型的特征和相互关系及其空间分布等。     

Development of an RPLC-based Method for Measurement of Indoprofen Stability and Validation of the Method

A method for quantitative measurement of the photochemical decomposition of the anti-inflammatory agent, indoprofen （INP） is descriped. An RPLC-based assay that could determine the extent of degradation of INP in a rapid, sensitive, and accurate manner was developed. The method was validated under photoirradiation. Quantitation was monitored with an Inertsil ODS-3V column using a mobile phase of acetonitril and 1% HOAc solution in deionized H2O. Statistics relevant to the system criteria, peak integrity and resolution among the parent drug and its degradation products were performed. From the intra- and inter-day tests, the coefficients of variation were found to range from 0.59% to 4.25% for the former and from 0.71% to 4.86% for the latter. The good selectivity and specificity of this RPLC-based procedure render it suitable for measurements of INP stability.     

线弹性问题的一个四面体元分析

构造了一个新的locking-free非协调四面体元,研究了单元对三维纯位移弹性问题的一致收敛性,得到了最优的误差估计结果.