Biosynthesis of gold nanoparticles by Trichoderma sp. WL-Go for azo dyes decolorization

Developing an eco-friendly approach for metallic nanoparticles synthesis is important in current nanotechnology research. In this study, green synthesis of gold nanoparticles(AuNPs) was carried out by a newly isolated strain Trichoderma sp. WL-Go. UV–vis spectra of Au NPs showed a surface plasmon resonance peak at 550 nm, and transmission electron microscopy images revealed that the Au NPs were of varied shape with well dispersibility.The optimal conditions for Au NPs synthesis were HAuCl_4 1.0 mmol/L, biomass 0.5 g and pH 7–11. Moreover, the bio-Au NPs could efficiently catalyze the decolorization of various azo dyes. This research provided a new microbial resource candidate for green synthesis of Au NPs and demonstrated the potential application of bio-Au NPs for azo dye decolorization.     

炼油企业设备完整性管理初始状态评价探索与实践

针对某炼厂试点装置的设备完整性管理体系执行状况开展了初始状态评价。本次评价以美国职业安全与卫生署《化学品过程安全管理》设备完整性要素为基础,结合过程安全管理符合性导则与建议、机械完整性实施指南等业界最佳实践,编制评价问项,组建包含管理、工艺、设备人员和承包商在内的评价工作组,采取查阅档案、信息化平台纪录,面对面访谈,作业现场考察与验证,评价工作会等方式,以半定量的方式找出了设备完整性管理体系较高的残余风险,对设备完整性管理体系框架结构和管理文件体系以及绩效指标体系提出了针对性改进建议。     

危险化学品从业单位安全标准化风险评价方法的选择与应用

通过对工作危害分析法等8种常用的风险评价方法的评价目的、特点、适用范围、应用条件以及优缺点进行比较和分析,针对危化品从业单位实施安全标准化过程中风险评价方法的选择,提出了意见和建议。     

大型石化项目HSE作业指导书的应用

运用HSE管理理念,研究石化项目建设过程中HSE的有效管理模式,通过实例介绍了HSE作业指导书的具体应用。     

一次暴雨空报和预警失误分析

通过分析2009年5月17到20日的天气背景、对比分析清远本站和郴州站的探空资料,以及清远本站的湿度、风等要素,找出北部地区和南部地区在同一环流背景下,所产生量级差异较大的降水原因。得出郴州站对北部地区的强降水指示意义在一定程度上大于清远本站;而清远本站的单站资料对清远本站强降雨指示意义明显。精细分析天气系统位置,可提高强天气在同一地区内的精细落区预报。雷达资料对本站的强天气预警信号发布具有重要指示意义。     

泥浆护壁钻孔灌注桩安全施工技术

分析了泥浆护壁钻孔灌注桩施工中的安全隐患及原因,提出相应的对策.     

墨西哥湾“深水地平线”钻井平台事故分析与反思

对美国墨西哥湾“深水地平线”钻井平台爆炸事故进行了原因分析,总结了事故的经验教训,并从技术、管理、应急救援体系、技术研发4个方面为中国石化提出了预防类似事故的建议措施。     

Measuring environmental efficiency and technology inequality of China’s power sector: methodological comparisons among data envelopment analysis,free disposable hull,and super free disposable hull models

Environmental Science and Pollution Research - China’s power sector has received great research attention because of its large energy consumption and CO2 emissions. This study assesses the...     

Association of individual green space exposure with the incidence of asthma and allergic rhinitis: a systematic review and meta-analysis

The association between allergic respiratory diseases, such as asthma and allergic rhinitis (AR), and green space (GS) remains controversial. Our study aimed to summarize and synthesize the association between individual GS exposure and the incidence of asthma/AR. We systematically summarized the qualitative relationship between GS exposure and asthma and AR. The pooled odds ratio (OR) with 95% confidence intervals (CIs) was used to estimate the effect of the Normalized Difference Vegetation Index (NDVI) on asthma and AR. A total of 21 studies were included for systematic review, and 8 of them underwent meta-analysis. In the meta-analysis of current asthma, the 0?<?radius?≤?100 m group, 100?<?radius?≤?300 m group, and 500?<?radius?≤?1000 m group presented weak negative associations between the NDVI and current asthma. For ever asthma, slight positive associations existed in the 0?<?radius?≤?100 m group and 300?<?radius?≤?500 m group. In addition, the NDVI might slightly reduce the risk of AR in radius of 100 m and 500 m. Our findings suggest that the effects of GS exposure on asthma and AR were not significant. Differences in GS measurements, disease diagnoses and adjusted confounders across studies may have an impact on the results. Subsequent studies should consider potential confounding factors and use more accurate GS exposure measurements to better understand the impact of GS exposure on respiratory disease in the population.

     

Characteristics and provenance of dustfall during an unusual floating dust event

This study aims to investigate the characteristics, provenance, and particle-related pollution of an intense dustfall event that occurred in Beijing on 16–17 April 2006. Satellite images reveal that the aeolian dust originated in northeastern Alxa League of Inner Mongolia and passed southeastward across northern Ningxia, middle Inner Mongolia, northern Shaanxi, Shanxi, and Hebei provinces. The dust then moved out of continental China in the vicinity of Beijing and Tianjin. The floating dust led to severe air pollution in Huhhot, Datong, and Beijing. We measured dustfall by collecting dust samples, investigated particle morphology, and calculated the mass medium diameter (MMD) of the dustfall using a scanning electron microscope (SEM). Major elements and mineral content of the dust particles were determined by electron probe and powder X-ray diffractometer, respectively. The relative abundance of dustfall during this event was 12.5–15.0 g m^?2, making up about 10% of the total annual dustfall in Beijing. Dustfall amounted to 205 thousand tons in Beijing, the largest amount observed in recent years. The dust particles were mostly angular, subangular and subrounded in morphology, and the MMD was nearly 12 μm. Particles <10 μm accounted for 54.7% by number, but fine sand particles (larger than 50 μm) made up 53.7% by volume. Particles with diameters larger than 20 μm made up of the predominant volume of the samples (90.35%). Hence, this dustfall event was characterized by a high content of fine sand and coarse silt particles. The principal elements in the dust particles were C, O, Si, Al, Fe, and Ca, whereas the major minerals were quartz, Na-feldspar, calcite, and clay minerals.