Safety-related conclusions for the application of ultrasound in explosive atmospheres

International safety regulations such as EN 1127-1 consider ultrasound to be an ignition source. Currently, applications of ultrasound in explosive atmospheres have to comply with a threshold value of 1 mW/mm². However, it is unclear as to how this intensity has to be measured and, therefore, this threshold value is poorly defined. Moreover, it is based on theoretical estimations in analogy to other ignition sources and there are no publications or significant records on these estimations. Within a research project at PTB, it has now been investigated experimentally in relation to worst-case considerations including airborne ultrasound, focused MHz ultrasound in liquids and acoustic cavitation. On the basis of the results of the research it is now possible to revise the current regulations and to specify measures for safe operation of ultrasonic applications in explosive atmospheres. In this context, for ultrasound coupled directly to gaseous atmospheres a new threshold value of 170 dB (re. 20 μPa) can be suggested, and for ultrasonic applications in liquids, an augmentation can be made to the threshold to 400 mW/mm².     

我国目前伤亡事故接连发生和难以遏制的致因是违背人类工效学原理

运用人类工效学的基本原理与方法。指出一些企业任意延长劳动工时，无视劳动保护和劳动保障。事故发生后对事故的分析不全面、不科学。是导致我国目前伤亡事故频频发生的致因。     

我国民爆行业安全管理存在的主要问题及其对策

今年以来，民爆企业重、特大事故多发，安全生产日趋严峻。随着我国国民经济的快速发展，民爆行业安全问题已日益成为社会关注的热点，也成为安全监管的重点。本文从政府行业监管职责、企业主体责任两个层面存在的突出问题的剖析入手，为进一步强化民爆行业安全监督管理工作，在实施产业技术政策，落实政府监管责任，推进企业技术进步，加强企业基础管理，完善法律法规标准，深化安全专项整治，强化安全许可工作等方面提出了对策建议。     

当代大学生思想政治状况分析及对策

根据高校大学生思想教育工作和公共理论课教学工作问卷调查统计,分析了当代大学生的思想政治状况及特点,指出了其成因,提出了加强大学生思想政治工作的方法和途径,为做好高校学生工作提供了借鉴。     

Numerical model of flow and pollutant transportation in non-orthogonal curvilinear coordinates

The planar 2D k-ε double equations‘ turbulence model was adopted and transformed into non-orthogonal curvilinear coordinates. The concentration convection-diffusion was introduced to planar 2D SIMPLEC algorithm of flow in non-orthogonal curvilinear coordinates. The numerical model of pollutant transportation in non-orthogonal curvilinear coordinates was constructed. The model was applied to simulate the flow and pollutant concentration fields. In the testing concentration field, two optimal operations of contamination discharging both along bank and in the centerline at the first bend of the meandering channel were adopted. Comparison with available data showed the model developed was successful, was valuable to engineering application.     

环境地表γ计量率、工频电磁场和射频电场监测实验结果对比分析研究

本文通过两实验室针对环境地表γ计量率、工频电磁场和射频电场仪器对比实验,并对结果进行了统计检验。分析结果表明,两者监测数据无显著差异。     

2004—2017年浙江省较大以上生产安全事故统计分析

为充分探究浙江省生产安全事故发生规律,以2004—2017年浙江省生产安全事故为研究对象,从事故发生的时间关系、区域分布、行业分布、事故类型分布等方面对全省总体、工矿商贸领域、化工领域、典型危险作业4个分类的较大以上事故特点进行了剖析研究;并从政府监管的角度,提出事故防范的措施和建议。     

The moderating role of calling in the work–family interface: Buffering and substitution effects on employee satisfaction

This research seeks for improved understanding regarding the interaction of meaningful work and the work–family interface. Existing literature suggests that experiencing a sense of calling toward work makes the work domain particularly salient to employees compared to other life domains. In this article, we draw on this idea, rooted in identity theory, to hypothesize that a sense of calling toward work diminishes the effects of work–family conflict and work–family enrichment on employee's job and life satisfaction. We test these ideas in two studies. First, we surveyed an alumni sample of 598 employees from various jobs, industries, and job levels. Then, in a constructive replication, we surveyed 327 employees using a time-lagged design. Calling was found to significantly buffer the effect of work–family conflict on job satisfaction in Study 2, but not Study 1. Calling did not buffer the effect of conflict on life satisfaction in either study. However, both studies demonstrated that calling attenuated (substituted for) the effect of work–family enrichment on job satisfaction. Study 1 supported the idea that calling attenuates the effect of enrichment on life satisfaction; however, this interactive effect was reversed in Study 2, contrary to expectations. We discuss implications for theory and practice related to callings and career choices, as well as for the role of calling and work identity in the work–family interface.     

我国安全专业人员职业化建设现状与分析

我国安全生产形势严峻的深层原因在于安全专业队伍的数量不足、素质不高。有关安全专业人员执业资格的部门规章和地方法规不仅存在交叉,而且法律效力低,这导致许多取得注册安全工程师执业资格安全专业人员在企业得不到重视和重用。参照发达国家和地区安全专业执业资格制度取得的效果和启示,本文提出了实施人才兴安战略的几点对策建议。     

中国安全生产大趋势已进入拐点——生产安全事故宏观预警与发展态势分析

为认清我国安全生产形势现状与发展趋势,作者应用比较研究和预测分析方法,回顾总结了我国生产安全事故历史演变特点,对事故死亡人数、十万死亡率和重大事故发生频率等安全生产指标作了近中期预测模拟分析;结合我国经济社会发展现状,提出了中国安全生产大趋势已进入拐点的判断,并建议在新的历史机遇面前,对安全生产监管模式做重大调整,推进安全生产形势根本性好转,实现安全发展。