X线胸透受检者的体表照射量分布及评价

本文应用热释光剂量元件测定了苏州市第一人民医院９０人次Ｘ线胸透时受检者体表照射量的分布。测量结果表明：相应于第６胸椎处的照射量最大，以此处为参考点照射量向四周逐渐下降。每次胸透受检者最大入口体表照射量的平均值和单次测量标准差分别为２．１５×１０￣（－４）和１．３４×１０￣（－４）Ｃ·ｋｇ￣（－１），每次胸透所致平均有效剂量当量为０．２２ｍＳｖ。     

数控机床基材——花岗石应用探讨和改进

对花岗石作为数控机床机身的应用进行分析。对花岗石作为基材与传统的铸铁材料应用于设备制造中优缺点进行比较。根据花岗石的物理特性和在实际使用过程中存在的问题。提出改进意见。旨在提高花岗石在机床制造业中的使用价值和性能。     

多探头全身计数器探测效率随体模大小的变化及修正

本文介绍利用计算机对全身计数器进行效率刻度的方法，文中计算一个固定多探头全身计数器系统对不同大小体模的探测效率，分析了探测效率随体模长度和体厚因子变化的关系，并给出了对于＾１３７Ｃｓ源，通过修正参考人体模的探测效率而得到不同大小（身长１４５～１８５ｃｍ体，重４５～８７ｋｇ）体模探测器效率的近似公式。     

上海纱罩厂部分职工体内钍含量调查

本文介绍了利用呼气中(气土)浓度测定法对上海纱罩厂部分工作人员体内钍含量进行调查的结果。调查人数为51人,其中行政人员6人,体内钍含量平均值为0.36Bq,与对照组0.33Bq 相比无显著差异;操作工人45人,平均值为1.65Bq,比对照组高4倍,最大值为8.35Bq,约高出24倍。还分析了呼气中(气土)浓度及体内钍含量与工种、工龄的关系,比较了呼气中(气土)浓度测定法与中子活化测定法的调查结果。     

改良型双滤膜法测定呼气的研究

本文叙述了一个用于测定呼气的改良型双滤膜装置。改良型双滤膜装置是在通用型双滤膜装置上加入了一个气溶胶输给系统,因而显著降低了原装置的壁吸附,大大提高了灵敏度。根据本文采用的程序能测出~(232)Th 在人体内最大容许体负荷量的0.03%。本方法不但能测定呼气(气土),还可以测定环境空气中的氡、(气土)浓度。本文详细介绍了该装置的原理、设备、计算方法以及测定结果。     

The effect of knife handle shape on stabbing performance

A quantitative knowledge of stabbing ability is a pre-requisite to establishing protection standards for stab resistant body armour. In order to determine the validity of measurements it is necessary to understand all the mechanisms that determine performance. This paper describes a series of tests that were performed in order to determine the effect of handle size and shape on the forces and impact energy that could be produced during stabbing of an armoured target. It was found that the single largest variable was that of the test participants with all other variables such as handle size and shape having only slight effects on the magnitude of impact energy. The use of a finger guard or hilt was shown to increase the mean energy delivered to the target by approximately 5J compared to a handle having no guard. It was also found that the characteristics of energy delivery were strongly influenced by the position of the grip relative to this guard. This reinforces the conclusions of previous work (Horsfall et al., 1999; Chadwick et al., 1999) on the serial nature of momentum transfer during a stabbing impact.     

文峪河水库右岸山体的稳定分析及加固处理

本文根据文峪河水库右岸山体的地形地质特点、所处位置的重要性及稳定分析成果 ,提出了右岸山体稳定的关键是降低地下水位、防止软弱夹层泥化 ,并针对地下水的来水途径提出了相应的加固措施。     

电动轮自卸车车厢结构有限元建模与分析

通过测绘建立电动轮自卸车车厢结构的三维实体模型,采用壳单元、焊接单元和实体单元实现车厢结构的有限元网格划分,在归纳车厢工作载荷特征的基础上,建立了车厢结构有限元模型。针对典型载荷工况对车厢结构进行了有限元分析,获得了车厢结构的应力场和位移场分布,计算结果符合车厢使用损坏情况,对车厢的结构改进与制造维修具有指导意义。     

称重传感器弹性体的有限元分析

本文利用有限元法，通过对两种材料１００ｋｇ称重传感器弹性体的多次有限元计算、数据的分析和整理，给出了这种传感器弹性体的应力场分布状况和变形状态，并提出了作者的几点看法，供设计制造高可靠性传感器弹性体时参考。     

Comparison of the desiccation effects of marine and freshwater diatomaceous earths on insects

The desiccating effects of two different types of diatomaceous earths (DEs), of freshwater and marine origin, applied by two different methods, were compared on four species of insects, Cryptolestes ferrugineus, Rhyzopertha dominica, Sitophilus oryzae and Sitophilus granarius. The purpose was to investigate the performance of DEs, including their abrasive and absorptive effects through the accumulation of silica dusts on the insect cuticle, resulting in death of the insects by desiccation. The data obtained showed that similar insects treated with the same type of diatom, but applied either by spraying or dusting, did not have the same initial mortality rate.

After examining and comparing the data obtained, it appeared that weight loss at death of insects subjected to the action of sprayed DEs was slightly less than for insects subjected to dust application, while mortality was slightly more rapid during the observation period. The extra weight of dusted insects was ascribed to greater adherence of dust particles to the treated insects.