对200AGeV~(32)S与核乳胶相互作用产生的靶核碎片的研究

本文对200AGeV~(32)S 与核乳胶相互作用产生的靶核碎片进行鉴别.对靶核碎片多重数及角分布进行了测量。测出黑、灰粒子质子能谱。分析测出的黑粒子质子能谱,认为黑粒子主要是从激发的剩余靶核蒸发出来的,但有相当数量的黑粒子是从核内级联碰撞产生的。     

群体评价中的并合方法

在生产和社会实践中,经常遇到诸如设计方案评选、企业评价、成果评奖之类的评价问题。在评价实践中,常有多个评价者同时参与,当评价者意见(评价结果)不一致时,就需集各评价者的意见为一体,用其作为群体的意见。这种集各评价者意见的方法及其用于评价的行为称为群体评价,相应单个评价者的方法及评价行为称为个体评价。群体评价是在个体评价的基础上进行的。     

H-Y antigen expression in heterogametic males (XY) and females (ZW): a factor in reproductive strategy?

The cells of heterogametic females with ZW sex chromosomes express H-Y or H-W antigen. A hypothesis is formulated to explain why these animals are capable of 'practicing' amphigonia retardata, i.e., delay in actual fertilization of eggs by retaining viable sperm within the oviduct for a considerable time (several months).     

软件系统设计中的模块化思想和技术

本文回顾了设计大型数据处理系统中广泛应用的结构化设计(SD)方法、结构化分析(SA)及结构化程序设计(SP),阐明控制问题复杂性的抽象和分解思想、模块特性、划分模块的原则和评价模块质量标准及模块独立性概念。     

钟表厂生产与货仓动态管理系统

介绍钟表厂生产与货仓动态管理系统的研制及其设计技巧。     

Reproductive consequences of mega vitamin E supplements in female rats

Summary Female rats fed 0, 25, 2500 and 10,000 IU vitamin E/kg diet for 3 months were examined for reproductive performance. On 10,000 IU vitamin E/kg diet, the fertility of inseminated rats was significantly reduced as compared to rats given normal or nutritional levels of vitamin E.This work was supported by research grants from the National Research Council of Canada and the Research Committee of The University of British Columbia. We thank Mrs Virginia Green for her help in statistical analysis. Reprint requests should be addressed to Dr I. D. Desai, Professor of Nutrition.     

龙头锰矿缓倾斜多层邻近薄矿体采矿方法试验研究

本文根据龙头锰矿试验矿块的地质条件和试采一年多以来的实测数据,以及室内相似材料模拟试验结果,分析研究缓倾斜多层邻近薄矿体的开采方法。研究表明,矿层群的开采,特别是近距、低品位矿层群的开采,多以分采为宜;只要合理选择凿岩爆破参数,和采取正确的台阶形式,能安全回采多层矿体而又不破坏厚度仅为2.7～2.9米的隔层。     

Reliability Analysis of Some Typical Repairable Systems with Arbitrary Repair-Time Distribution

In this paper, reliability of some typical non-Markov repairable systems, including series systems, m-out-of- n or majority vote systems, and n : m cross-strapping standby redundant systems with general repair-time distribution, are studied by applying the generalized Markov renewal process (GMRP). The stochastic behavior of the typical systems is analyzed here. Formulas for mean time to first system failure, MTBF, MTTR, and availability are then developed.