带压堵漏作业防护探索与研究

本文分析了泄露现场的化学和物理危害因素及由此导致的各种后果,而且针对泄露事故对作业人员不同部位的伤害提出了相对应的个人防护用品,同时提供了与之相对应的国家行业标准.     

基于AI芯片的输电通道外破隐患边缘智能监测装置研制及应用

塔吊、挖掘机等外破隐患导致输电通道事故频繁发生,有效地检测输电通道周围的外破隐患对保障输电线路安全稳定的运行意义重大。该文以边缘智能芯片为基础,研制了一种输电通道外破隐患边缘智能检测装置,并提出了一种适用于计算资源有限前端装置的轻量化外破隐患识别方法。利用深度残差网络对输电通道图像进行视觉特征提取;利用候选区域生产网络RPN捕获外破隐患目标的候选区域,再用全卷积神经网络FCN进行外破隐患的目标分类与定位。以实际采集的输电通道图像构建成样本集,进行模型测试与验证,结果表明所提方法在边缘装置中表现出良好的适用性。     

基于应变信号的复合材料层合板低速冲击损伤识别研究

为了进行复合材料层合板的冲击损伤识别研究, 设计了由小到大的14个等级的冲击能量, 对应由小到大的冲击损伤, 其中最小能量的冲击没有造成损伤, 最大能量的冲击造成穿透复合材料板的损伤。应用冲击过程中测试得到的应变响应进行损伤识别。基于冲击过程中获得的脉冲应变信号, 提出了10个新的冲击损伤识别指标：脉冲上升时间、下降时间、总时间、上升时间比下降时间、下降时间比上升时间;脉冲上升面积、下降面积、总面积、上升面积与下降面积之比、下降面积与上升面积之比。将提出的10个新冲击损伤识别指标与冲击能量的关系进行了对比研究。研究表明：脉冲下降时间、脉冲总时间、脉冲下降面积、脉冲总面积与冲击能量之间的关系大体上都是单调的, 这4个指标适合0.8J/mm到6.67J/mm的大范围的冲击损伤程度识别, 其余6个指标在一定的冲击能量范围内可以识别冲击损伤程度。应用脉冲下降面积、脉冲总面积指标进行了冲击定位识别研究, 研究表明, 这两个指标也可以识别冲击损伤的位置。     

试论减少浸渍坯表面黏附沥青的途径

在浸渍生产过程中,浸渍坯表面经常出现沥青"反渗"现象,这一现象直接影响到浸渍制品的质量。同时增加了生产过程浸渍剂的消耗,导致工序成本增加,污染了环境。本文分析了浸渍坯表面黏附沥青的原因、危害,并提出相应的解决途径。     

Micropatterning of photosensitive glass-ceramic-polymer composite by sand blasting

Abstract

A photosensitive, sandblasted composite was used to achieve a high aspect ratio of barrier ribs. The authors investigated the erosion of the photosensitive composite prepared with two different pastes: normal and photosensitive. The barrier ribs underwent micropatterning with calcium carbonate powder as the sand blasting erodent material. The patterned green barrier ribs were fired in an air atmosphere and the thermal, physical and mechanical properties of the resulting composites were determined by thermal gravimetric analysis, atomic force microscopy, nanoindentation, and peel testing. The photosensitive composite had better adhesion with a dry film resist and showed lower porosity, surface roughness, stiffness and elastic modulus than a normal composite, which was attributed to the remaining polymer. In the process, the developed photosensitive composite and the dry film resist film were able to withstand the impact of the separated particles or clusters. These results support the use of sand blasting to fabricate the micropatterning of barrier ribs with two layers of photosensitive composite.     

Effect of Ce,Sb and Sn on mechanism and activation energy for crystallisation of X‐ray irradiated photosensitive glass

Abstract

Abstract

This work aims to determine the effect of Ce, Sb, Sn and Ag on the mechanism and activation energy of crystallisation for an X‐ray irradiated photosensitive lithium silicate glass composition and to compare it with the one that contained only Ag. According to the obtained results, while the addition of Ce, Sb and Sn changed the crystallisation mechanism of lithium silicate crystal from two‐ to three‐dimensional growths, these additions did not affect the activation energy of crystallisation for lithium metasilicate. Differential thermal analysis was used for studying the mechanism and activation energy for crystallisation of these glasses through the Matusita and the modified Kissinger methods; SEM and XRD were used to investigate the lithium silicate and silver crystallisation in the glasses.     

层燃锅炉燃烧设备损坏的原因及改进措施

层燃锅炉的煤闸门、两侧密封、炉门、炉排片易被烧坏，分析了被烧坏的原因，并提出了相应的改进措施。     

水库水有机污染物遗传毒性的研究简

为研究水库水经国内常规给水处理工艺的各阶段出水中有机提取物对细胞DNA损伤的情况,于8月和1月取水库水作为原水,设定采集4个水样：原水（A）、经混凝沉淀后的沉后水（B）、滤后水（C）和经氯消毒的出水（D）。提取水样中的有机物配成不同浓度溶液,喂食小白鼠,取小白鼠脾脏细胞做彗星实验。结果无论在枯水期还是丰水期,水处理工艺各阶段出水对DNA都有不同程度的损伤,损伤程度顺序：A〉B〉D〉C;丰水期水样对DNA损伤程度高于枯水期水样对DNA的损伤。结果表明,水库水中的有机物污染物具有一定的遗传毒性,常规给水处理工艺对遗传毒性有削减作用,但不能消除。加氯消毒增加了水库水的遗传毒性。     

Simulation of the Crashing of Sandwich Structures under Impact Loads by Movable Cellular Automata

Movable cellular automata (MCA) method is applied in the analysis of dynamic characters of ceramic armor composite structures under impact loading. As a new approach, MCA is different from the traditional numerical methods such as the finite element method and boundary element method. Based on the theory of particle mechanics, MCA is applied as a powerful tool in relying specific structural analysis of materials loss and penetrating damages. In this paper the method is used to study responses of multi-layered ceramic plates as a base of armor structures under impact loading, thus assisting further investigations in the crashing process and to improve ceramic armor structures.