Penetration of soil dust through woven and nonwoven fabrics

Abstract

Several types of fabrics were laboratory‐tested for their effectiveness in worker protection to pesticide‐laden dust encountered in the agricultural environment. Of the applied <100 mesh dust, penetrations through knitted jersey and woven fabrics were greater than 87% and less than 5.8%, respectively. Treatment of woven fabrics with fluorocarbon polymers curtailed penetration by greater than 60%. Nonwoven fabrics allowed less than 0.5% dust penetration. Parathion mixed with 100‐mesh sieved dust resulted in increasing “ppm”; levels with decreasing particle size; extent of parathion conversion to paraoxon was independent of particle size for the sandy loam dust used.     

电子设备的屏蔽技术

在电子设备的屏蔽设计中，不能有直接穿过屏蔽体的导体和屏蔽体的导电连续性是两个最基本的原则。     

大学生对废旧服装回收利用认识的调查分析

对大学生对废旧服装回收利用的认识进行了问卷调查与分析.首先对大学生希望的废旧服装处理方式及回收方式、对废旧服装回收的认识进行了调查与分析,然后对大学生二手服装购买的态度、购买二手服装时注重的因素、对穿着二手服装的认识进行了调查与分析.研究结果：多数学生期望废旧服装应由慈善公益机构或商业机构回收,捐给有需要的人或循环利用、或作为二手服装销售;多数学生购买二手服装时最注重的因素是卫生安全,能够认识到穿着二手服装和废旧服装回收是环保和节约资源的需要.其研究结果以期对我国废旧服装的回收体系及回收渠道的建立提供一定的参考价值;对大学生及家度对废旧服装回收再利用认识的提高具有一定的促进作用.     

Parallel and Serial Methods of Calculating Thermal Insulation in European Manikin Standards

Abstract

Standard No. EN 15831:2004 provides 2 methods of calculating insulation: parallel and serial. The parallel method is similar to the global one defined in Standard No. ISO 9920:2007. Standards No. EN 342:2004, EN 14058:2004 and EN 13537:2002 refer to the methods defined in Standard No. EN ISO 15831:2004 for testing cold protective clothing or equipment. However, it is necessary to consider several issues, e.g., referring to measuring human subjects, when using the serial method. With one zone, there is no serial-parallel issue as the results are the same, while more zones increase the difference in insulation value between the methods. If insulation is evenly distributed, differences between the serial and parallel method are relatively small and proportional. However, with more insulation layers overlapping in heavy cold protective ensembles, the serial method produces higher insulation values than the parallel one and human studies. Therefore, the parallel method is recommended for standard testing.     

Thermal Strain in Fire Fighters While Wearing Task-Fitted Versus EN 469:2005 Protective Clothing During a Prolonged Rescue Drill

Fire fighters are normally overprotected during their working hours because of the tendency to keep the personal protection level sufficiently high in case of the worst possible scenarios. This study investigated the effects of task-fitted protective clothing on thermal strain in fire fighters as compared to EN 469:2005 protective clothing during a prolonged (2 1/2 hrs) job-related rescue drill under neutral and hot climates. The subjects were 23 healthy, physically fit professional male fire fighters aged 26–44 years. Measurements included cardiovascular and thermal responses and subjective assessments. Wearing task-fitted clothing during rescue tasks in a neutral climate considerably reduced total thermal and cardiovascular strain in prolonged rescue work. The fire fighters also perceived physical work as significantly harder on average, and reported more intense subjective discomfort while wearing EN 469:2005 as compared to task-fitted clothing.     

电加热服装的研制

本文采用电加热原理,研制了一种加热服装,由背心、电池和加热载体三部分组成,可遥控操作不同的发热功率,全功率发热时间大于3h,衣内表面温度不低于50℃。     

新型组合式消防服热防护性能分析

本文对不同隔热层材料组成的消防服的热防护性能进行了实验测试与分析验证,评价了新型组合式消防服和传统组合式消防服的隔热性能优劣。结果表明以SiO2气凝胶材料为隔热层的新型组合式消防服的导热系数约为传统型的1/4,具有更显著的热防护效果。     

建筑行业职业工装的应用设计

本文通过对建筑行业工作特点及其安全性的要求分析,研究建筑行业职业工装的款式结构、服装安全色彩的选择以及服装加工过程中的规范,对建筑行业职业工装提出了具体的设计方法,总结出了较系统的思路,以期为建筑行业安全生产提供必要的保障。     

气凝胶消防服概念研究

对现役消防服的隔热材质和使用性能,以及气凝胶作为新型纳米隔热材料在服装方面的应用现状进行了分析。根据初步对比讨论了SiO2气凝胶复合材料用于消防服的可行性,得出以下结论：在同样的热防护性能前提下,采用SiO2气凝胶复合材料可使消防服重量及厚度降低70％以上。     

新型消防员隔热防护服外层面料结构及加工

本文描述了一种新型消防员隔热防护服的外层面料。面料的结构由铝箔、聚酯膜和基布组成。通过对铝箔复合、涂胶等加工方法的摸索试验,试制了新型消防员隔热防护服的外层面料。