静压下GaAs_(1-x)P_x混晶的喇曼散射

在77K下和0—60kbar静压范围内测量了GaAs_(1-x)P_x(0.76 ≤x≤1)混晶的喇曼散射谱。得到了这些混晶的类GaP的LO模的压力系数。发现在所研究的x范围内GaAs_(1-x)P_x混晶的类GaP的LO模的压力行为与Gap的LO模基本相同。利用测得的压力系数计算了类GaP的LO模的模式Gruneisen参数。     

SD理论与实验研究

在放电长度740mm、放电间隙16mm 下,获得 SD 电流2.5A,放电功率密度达43.7W/cm~3,介质功率注入效率为99.45%。在理论上,提出 SD 介质功耗矢量图和 SD 参量计算公式。     

苯丙氨酸酯类衍生物对映异构体的拆分

利用手性Ｃｈｉｒａｌｃｅｌ ＯＤ柱高效液相色谱对一系列苯丙氨酸酯类衍生物对映异构体进行了拆分，获得了良好的分离结果。讨论了化合物的结构对拆分效果的影响。     

拓扑空间的若干分离性及关于杨忠道定理的两个等价条件

在一般拓扑学中，有一个著名的杨忠道定理，拓扑空间X的任意子集的导集是闭集的充分必要条件是每个单点集的导集是闭集，本文给出另外两个等价条件，并讨论了T0，T1空间与我们称之为T0．5空间之间的关系。     

A new explanation of decreasing failure rate of a mixture ofexponentials

It is well known that the mixture of exponential distributions has a decreasing failure rate, even though each component in the mixture has a constant failure rate. This result is elegant but sometimes seen as a paradox. This paper shows that the proportion of strong (weak) subpopulation with small (large) failure rates in the mixture increases (decreases) as time passes. Based on this fact, a non-Bayes explanation is given for the mixture of exponentials to have a decreasing failure rate     

振放交叠独立调谐的双波长染料激光器

报道了一种新型的双被长染料激光器，它的两个波长的振荡和放大通过一块半反镜的耦合而相互交叠，具有压低ASE背景和提高激光效率等多方面的优点。     

Interval estimation of availability of a series system

For a system that consists of n independent subsystems connected in series, based on a sample of complete periods for each subsystem, an approximate interval estimate of the steady-state availability of the system is presented for three cases: when each lifetime and repair-time has an exponential distribution; when each lifetime has an exponential distribution and each repair-time has a log-normal distribution; and the case where each lifetime and repair-time has a log-normal distribution. For a large system it often costs less to test subsystems than to test the system. Consequently, it is more economical to estimate the steady-state availability of the system by using the data from each subsystem. Moreover, it is time-saving since subsystems can be tested simultaneously prior to assembly of the system. Numerical examples show good confidence bounds for the steady-state availability     

HPTLC Determination of Flavonoids and Phenolic Acids in Some Croatian Stachys Taxa

JPC – Journal of Planar Chromatography – Modern TLC - Stachys is a large genus belonging to the family Lamiaceae. In common with many other representatives of this family, the aerial...     

Reversible interconversion of thiazolidine-tetrahydrothiazine in the thiadiazabicyclooctanone system

Summary The interconversion of thiazolidine-tetrahydrothiazine in some derivatives of thiadiazabicyclooctanone in aqueous HCl has been studied. In the case of 6- and 7-substituted hydroxy or methoxy thiadiazabicyclooctanone a reversible rearrangement was found. The sulfoxide of thiadiazabicyclooctanone under the same reaction conditions undergoes epimerisation, while reaction with PCl₅ — via a corresponding sulfenyl chloride — affords a mixture of 6-and 7-substituted hydroxy or methoxy derivatives of thiadiazabicyclooctanone.The authors dedicate this paper to Dr. B. Gapert for his 60th birthday