甲基二氯硅烷甲醇醇解产物含量的红外与核磁共振分析

本文对二甲苯溶剂中ＭｅＳｉＨＣｌ２ 和甲醇的反应产物Ｍｅ （ＯＭｅ）２ＳｉＨ 及ＭｅＳｉ（ＯＭｅ）３ 作了红外和核磁共振分析， 结果表明： 以红外谱图中Ｓｉ－Ｈ 和苯环吸收带作为含量分析谱带， 采用比例法， 借助工作曲线，可确定反应产物的含量。亦可以通过对各组分处于不同化学位移下质子的核磁共振分析，采用归一化法，经过换算测定反应产物混合液中各组份含量。两种测定方法均简便快捷， 并对两法的测定结果作了分析比较。     

“4+1“模式军事人才培养综合素质评价研究

利用突变级数法的基本思想和突变系统的4种常用类型:尖点突变、燕尾突变、蝴蝶突变、因第安人茅舍突变,依据灰色理论和模糊数学,建立多目标的突变评价方法模型。在建立新型军事人才综合素质评价指标体系的基础上,运用突变模型对新型军事人才的综合素质进行了综合评价。     

光电编码器在调速系统中的应用

本文阐述了用光电编码器代替传统的测速电机和旋转变压器作调速系统反馈元件的技术。结果表明,光电编码器可有效地简化转换电路,更精确地测定出速度和位移两个参数。     

实用D/A变换器引起的信号抖动分析

本文针对模拟信号数字化处理后,其信号会出现抖动这一实际现象,进行了深入的理论分析和计算,指出产生抖动的主要原因是数字离散信号在Ｄ／Ａ变换器滤波后残留了部分高频分量。本文推导了残留高频分量引起幅度抖动和相位抖动的表达式,分析了影响幅、相抖动的主要因素,并提出了减小抖动的措施。本文得出的结论对数字化系统设计,具有实际指导意义。     

有限服务能力的损失制排队系统M/M/1分析

提出了随机服务系统的服务能力问题,给出有限服务能力的损失制M／M／1模型的描述和其稳态解,并求出了评价系统运行的几个主要数量指标。     

简易方便的陀螺漂移微机测试系统

本文介绍了一种采用微计算机的简易方便的陀螺漂移测试系统。它利用低成本高分辨率的A/D转换装置完成陀螺漂移及温度的测量。本系统能实时地对陀螺漂移进行计算、分析、显示和记录,并对陀螺温度实施精确的控制。     

差分GPS导航系统的设计

本文详细地介绍了差分GPS导航系统的设计方法。试验结果证明了该方法是正确可行的。     

Flintlock brass fittings from the 19th-century Akko 1 shipwreck,Israel

The Akko 1 shipwreck is the remains of a 26-metre-long Egyptian armed vessel or auxiliary naval brig built at the beginning of the 19th century. Remains of six flintlock muskets were retrieved from the shipwreck, and characterised by various metallurgical methods. The research aimed to study the composition and microstructure of the musket fittings and their manufacturing processes, and if possible, to determine the date and origin of the raw materials. The lead isotope analysis of the fittings suggests that their raw material originated in Great Britain. Based on their typology and composition, the fittings were made in Great Britain of brass alloy and manufactured by casting, probably at the same workshop; and the staple was manufactured by casting and drawing. Considering the zinc content, combined with the manufacturing techniques, the fittings were manufactured between the latter part of the 18th and the early 19th centuries, which might indicate that they were purchased in the course of 19th century weapons trade to be used on board the Egyptian ship.     

知识分子的“心灵史”——从《绿化树》到《饥饿的山村》

20世纪80年代以前,1959-1961年的大饥荒书写成为当代文学作品的重要题材之一,其中右派知识分子的"饥饿"体验更是受到作家的关注。本文仅就张贤亮的《绿化树》和智量的《饥饿的山村》两部描写"右派"在饥荒年代农村生活的小说为研究对象,通过分析文本对饥荒生活的呈现方式和对女性的态度,进而探讨知识分子的精神困境以及在80、90年代不同的自我身份认同危机。     

Preparation and characterization of HMX/EVA/hBNNSs micro-composites with improved thermal stability and reduced sensitivity

Hexagonal boron nitride nanosheets(HBNNSs)have huge potential in the field of coating materials owing to their remarkable chemical stability,mechanical strength and thermal conductivity.Thin-layer hBNNSs were obtained by a liquid-phase exfoliation of h-BN powders and incorporated into EVA coatings for improving the safety performance of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane(HMX).HBNNSs and ethylene-vinyl acetate copolymer(EVA)were introduced to HMX by a solvent-slurry process.For com-parison,the HMX/EVA and HMX/EVA/graphene(HMX/EVA/G)composites were also prepared by a similar process.The morphology,crystal form,surface element distribution,thermal decomposition property and impact sensitivity of HMX/EVA/hBNNSs composites were contrastively investigated.Results showed that as prepared HMX/EVA/hBNNSs composites were well coated with hBNNSs and EVA,and exhibited better thermal stability and lower impact sensitivity than that of HMX/EVA and HMX/EVA/G composites,suggesting superior performance of desensitization of hBNNSs in explosives.