自助加油站典型静电事故案例分析及防范措施

随着自助加油站在我国的不断推广和普及,其安全防护问题也日益凸显.为了促进我国自助加油站的安全管理,降低自助加油站的运营风险,首先对自助加油站面临的安全风险做了阐述,然后针对国内外自助加油站的典型静电事故案例进行了分析、整理及总结,并在参考和借鉴国外自助加油站相关法规的基础上,提出了一系列有针对性的静电事故防护措施.     

静电放电测试标准解析

设备在遭遇不同程度的静电放电时,其自身的安全性和可靠性面临着巨大的考验。GB/T 17626.2-2006、GJB 1389A-2005和RTCA/DO-160F均描述了静电放电试验项目。比较分析这三个标准对该项目在试验目的、适用对象等方面的差异,可以发现这三个标准的考核要求和试验方法也不尽相同。GB/T 17626.2-2006是一项基础性标准,适用于各种电子设备;GJB 1389A-2005主要针对垂直起吊、空中加油系统以及军械分系统,考核其在装卸、运输和垂直补给过程中的安全性和可靠性;RTCA/DO-160F主要考核的是民航空运设备在经受静电脉冲后执行预期功能的能力。     

Flooding in Texas: Examination of Temporal Changes and Impacts of Tropical Cyclones

Annual maximum peak discharge measurements from 62 stations with a record of at least 70 years are used to assess extreme flooding in Texas at the regional scale. This work focuses on examination of the validity of the stationarity assumption and on the impact of tropical cyclones (TCs) on the upper tail of the flood peak distribution. We assess the validity of the stationarity assumption by testing the records for abrupt and gradual changes. The presence of abrupt changes in the first two moments of the flood peak distribution is assessed using the Lombard test. We use the Mann‐Kendall test to examine the presence of monotonic trends. Results indicate that violations of the stationarity assumption are most commonly caused by abrupt changes, which are often associated with river regulation. We fit the time series of stationary flood records with the generalized extreme value distribution to investigate whether TCs control the upper tail of the flood peak distribution. Our results indicate that TCs play a diminished role in shaping the upper tail of the flood peak distribution compared with areas of the eastern United States subject to frequent TCs.     

Do Polynomials Adequately Describe the Hypsometry of Monadnock Phase Watersheds?

Hypsometry has been shown to be a useful tool in geomorphic analysis of watersheds with the use of third‐degree polynomial equations to express the hypsometric curve. Despite its usefulness with watersheds in the equilibrium stage, the third‐degree polynomial has been found to be inadequate to describe the hypsometry of Monadnock phase watersheds. Three other equations — a modified third‐degree polynomial with a rational term, a sigmoidal model, and a double exponential — were used to determine hypsometric attributes of 32 Monadnock phase watersheds and compared to the third‐degree polynomial form. The three other equations were found to be better fits for Monadnock phase watersheds than the third‐degree polynomial equation, regardless of which ratio — area or elevation — was plotted as the independent variable. Due to the occasional failure of each functional form to give logical values for hypsometric attributes, the importance of using more than one form equation is discussed. After determining the best‐fit equation for each watershed, the usefulness of hypsometric attributes is discussed in relation to erosion processes within Monadnock phase watersheds.     

含聚采油废水外排达标处理技术

本文针对含聚合物采油废水中聚丙烯酰胺生物毒性大、生化降解困难,采用二级气浮+活性污泥工艺对高含聚采油废水进行了现场实验研究。实验结果表明,处理后外排水中COD 80 mg/L,降解效率96.9%;石油类2 mg/L,降解效率98.6%,外排水的各项指标均能达国家和地方的相关标准。     

基于GIS环境管理平台聚类分析的实现

高效数字化管理技术是我国环境管理工作的关键和必然趋势。地理信息系统和多元统计方法虽然在环境管理中已经得到一定程度的应用,但这两种高效工具几乎处于"脱节"状态;文章在GIS平台上有效地集成了系统聚类分析方法,有利于区域环境质量管理对空间海量数据的分析,文章重点介绍了系统聚类谱系图的生成算法与绘制中的难点,并用实例验证了该算法的可靠性和实用性。     

浑河沈阳段污水排放口最优规划研究

针对沈阳市经济发展和污染加剧的特点,为合理充分利用浑河水环境容量,节约投资,建立了浑河沈阳段主要排污口最优化模型,并应用分段线性化对该模型进行了线性化,进而确定排污口最优化线性模型,最后通过M atlab软件求解出各排放口的污水允许排放浓度及最低的处理费用。     

Local Area Quotas for Industrial Emissions along Reaches of the Pearl River in Guangdong

Abstract

There is an obvious departure from the regional equilibrium of developments between the upper and lower reaches of the Pearl River in Guangdong, which resulted in “the effects of contra-geography-grads development”. It is mainly because the upriver mountainous areas have been deeply stuck in industrialization delay and marginalization plights, so that nearly 40 million local people have conceived a dream to get rid of “the vicious circle of poverty” by speeding up industrial development. But the problem is that such industrialization efforts on a large scale in mountainous areas are encountering the bottleneck of environmental capacity that strictly limits industrial emissions along the upper reaches of any water system. As a solution, an institutional arrangement called “the Local Area Quotas for Industrial Emis-sions along the Pearl River” is put forward supposed to give corresponding compensation to the rights of industrial development yielded by some areas with lower environmental capacity through the distribution and trading of IDQs.     

A Radio Communication System for Neuronal Signals

Abstract

To collect neuronal activity data from awake, freely behaving animals, we developed miniature telemetry recording system. The integrated system consists of four major components: 1) Microelectrodes and micro-driver assembly, 2) analog front end (AFE), 3) programmable system on chip (PSoC), and 4) radio transceiver and the LabVIEW were used as a platform for the graphic user interface. The result showed the system was able to record and analyze neuronal recordings in freely moving animals and lasted continuously for a time period of a week or more. This is very useful for the study of the interdisciplinary research of neuroscience and information engineering techniques. The circuits and architecture of the devices can be adapted for neurobiology and research with other small animals.     

关于控制四川省大气污染物排放的建议

本文介绍了2007年四川省废气污染物的排放情况,并提出了进一步控制大气污染物排放的建议。