提高基层班组JSA质量的管理实践

工作安全分析(简称JSA)作为有效的危害识别和风险控制工具被广泛使用,但基层班组员工所做JSA的质量一直不高,具体表现为员工虽然清楚JSA的各个环节,却不能高质量的完成.尽管这在一定程度上与基层员工文化素质低,文字表达能力差有关,但也是管理者缺乏具体和优秀的指导所致.针对实施JSA的各个环节,分析制约质量提升的具体原因,以标准规范为基础提出具体可行的改进措施,实施效果良好.     

高可视性服装标准ISO 20471：2013简介及应对策略

高可视服装国际标准ISO 20471：2013正式生效,该标准规定了警示服的设计和材料的性能要求,以保证使用者在高风险环境中的日间夜间条件下的可视性。该标准相对于曾经执行的标准EN 471：2003＋A1：2007进行了多处修改和调整,了解这些标准中的变化对于出口欧盟等国家的成衣制造商应对服装的设计和材料的要求将有非常好的借鉴意义。     

白炽灯灯丝残骸微观形貌分析

本文模拟火灾中不同情况,制备普通白炽灯破坏的灯丝残骸,利用扫描电子显微镜（SEM）分析灯丝残骸的微观形貌,研究灯丝在不同情况下破坏的特征。发现通电状态下破坏的灯丝氧化严重,与未通电状态的灯丝具有明显的区别。即使经历了高温或火焰灼烧作用后,微观形貌特征仍具有明显的差别。根据这种微观特征可以判断火场中白炽灯的通电状态。     

滑坡体三维构造及稳定性分析

采用体元技术建立滑坡体真三维模型,通过基本三棱柱体构建具有复杂曲面结构的空间组合体,每个单元都赋予不同的属性,为滑坡体三维稳定性分析提供基本的前、后处理功能.以此为基础,并结合三维极限平衡分析计算方法,开发了相关的滑坡三维模拟与稳定性分析软件,并成功应用于清江库岸大型滑坡的三维仿真计算.     

Polycyclic aromatic hydrocarbon and n-alkane pollution characteristics and structural and functional perturbations to the microbial community: a case-study of historically petroleum-contaminated soil

Characterization of the typical petroleum pollutants, polycyclic aromatic hydrocarbons (PAHs) and n-alkanes, and indigenous microbial community structure and function in historically contaminated soil at petrol stations is critical. Five soil samples were collected from a petrol station in Beijing, China. The concentrations of 16 PAHs and 31 n-alkanes were measured by gas chromatography-mass spectrometry. The total concentrations of PAHs and n-alkanes ranged from 973 ± 55 to 2667 ± 183 μg/kg and 6.40 ± 0.38 to 8.65 ± 0.59 mg/kg (dry weight), respectively, which increased with depth. According to the observed molecular indices, PAHs and n-alkanes originated mostly from petroleum-related sources. The levels of ΣPAHs and the total toxic benzo[a]pyrene equivalent (ranging from 6.41 to 72.54 μg/kg) might exert adverse biological effects. Shotgun metagenomic sequencing was employed to investigate the indigenous microbial community structure and function. The results revealed that Proteobacteria and Actinobacteria were the most abundant phyla, and Nocardioides and Microbacterium were the important genera. Based on COG and KEGG annotations, the highly abundant functional classes were identified, and these functions were involved in allowing microorganisms to adapt to the pressure from contaminants. Five petroleum hydrocarbon degradation-related genes were annotated, revealing the distribution of degrading microorganisms. This work facilitates the understanding of the composition, source, and potential ecological impacts of residual PAHs and n-alkanes in historically contaminated soil.

     

Biodegradable microplastics (BMPs): a new cause for concern?

Environmental Science and Pollution Research - With the increasingly serious pollution of plastics, biodegradable plastics (BDPs) have attracted attention as a new material that can replace...     

How air pollution lowers the domestic value-added ratio in exports: an empirical study of China

Environmental Science and Pollution Research - This paper analyzes the theoretical mechanism and transmission channel for the impact of air pollution on firms’ domestic value-added ratio...     

Evaluating provincial eco-efficiency in China: an improved network data envelopment analysis model with undesirable output

Environmental Science and Pollution Research - In this study, an improved matrix-type network data envelopment analysis (NDEA) model with undesirable output was developed to evaluate the...     

Analysis of metabolic changes in Trichoderma asperellum TJ01 at different fermentation time-points by LC-QQQ-MS

Trichoderma spp. are among the most widely recognized biocontrol fungi used to inhibit pathogens and promote plant growth. These functions are related to primary and secondary metabolites. This study investigated the different metabolites in Trichoderma asperellum TJ01 cultured for 24 and 72?h using liquid chromatography with triple-quadrupole mass spectrometry. Compared to the 24?h culture of T. asperellum TJ01, the 72?h culture with amino acid metabolism tended to decrease while sugar and lipid metabolisms tended to increase. Furthermore, the 72?h culture had a higher proportion of upregulated flavonoids, in combination with a higher proportion of downregulated alkaloids, and equal proportions of upregulated and downregulated polyphenols and hormones. This study also identified a few valuable medicinal substances such as trigonelline and 5-hydroxytryptophan in T. asperellum TJ01 fermentation cultures.     

Dissipation,residues, and risk assessment of imidacloprid in Zizania latifolia and purple sweet potato under field conditions using LC-MS/MS

A shortened version of Quick, Easy, Cheap, Effective, Rugged, and Safe method (QuEChERS) for determining the dissipation and residue of imidacloprid present in Zizania latifolia and purple sweet potato was established by using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The average recoveries of imidacloprid in the two crops ranged from 82.12 to 113.79%, with relative standard deviation (RSD) of <7.32%. The dissipation dynamics of imidacloprid in Z. latifolia plants and purple sweet potato plants followed first-order kinetics, with half-lives of 3.2–5.5?days in each of sampling locations. The terminal imidacloprid residues in Z. latifolia and purple sweet potato at each of location were <0.005–0.120?mg kg^?1. According to the risk assessment results, both the acute dietary risk quotient and chronic dietary risk quotient values were <1, indicating that imidacloprid is unlikely to pose health risks to humans with normal recommended use. The present study may serve as a valuable reference for the safe and reasonable use of imidacloprid in Z. latifolia and purple sweet potato fields.