原始燃煤生产有害元素的检测与控制

原始燃煤在开采阶段会产生多种有害元素,若处理控制不当会对生产人员的健康造成不利,也容易引起各种安全事故的发生。从煤矿企业的可持续发展角度考虑,加强有害元素的检测与控制是极为重要的。     

无铅无DOP的PVC护套料配方的研究

介绍了不含铅等有害重金属和 DOP,而且符合美国 U L6 2柔软线及装配线要求的电缆料的研究过程 ,阐述了无铅无 DOP配方中 PVC、增塑剂、稳定剂、防火剂、抗氧剂、填充剂、着色剂等原料的选择要求及配方的安全性能     

深基坑工程病害事故的应急处理

随着城区建筑物的日趋密集，深基坑工程的施工环境亦日趋恶劣，在施工过程中难免遭遇各种病害事故，如漏水漏砂、过大沉降、过大水平位移等。主要探讨几种易发事故产生的原因及其处理措施。     

金川不良岩体巷道支护技术可行性研究

金川不良岩体中巷道支护一直是困扰矿山生产的重大难题。由于矿区特殊的地质构造 ,形成很大的地质构造应力 ,岩体结构发育 ,巷道支护相当困难。借助于FLAC有限差分软件 ,进行模拟分析和方案优选 ,调整支护强度及刚度 ,限制围岩变形 ,以达到支护稳定的目的     

基于水华爆发的水源地安全模糊评价

根据水源地频发的水华爆发现象,采用故障树分析法,分析导致水源地水华爆发的原因.根据故障树分析结果,结合2010—2011年东营市某水源地水源数据资料,建立评价指标体系.采用模糊综合评价分析法,从水华爆发的角度对东营市某水源地进行安全评价,最终确定该水源地的安全等级.     

未确知测度理论在爆破飞石安全评价中的应用

根据土岩爆破中爆破飞石危害效应影响众多且难准确测定的特点,通过引入未确知测度方法,建立了爆破飞石的安全评价模型,并结合工程实例,对某土岩爆破工程中飞石的危害效应进行了基于未确知测度理论的安全评价。评价分析表明:基于未确知测度的爆破飞石安全评价模型,采用信息熵确定评价指标权重,在识别准则的确定上采用置信度识别准则,将各因素对爆破飞石危害效应的影响程度定量化,使评价结果更具客观性,为合理有效地控制爆破飞石的危害效应提供了决策依据。     

HR-ICP-MS测定婴幼儿奶粉的有害金属元素

HNO3/H2O2作为消解剂对婴幼儿奶粉样品进行微波消解,然后应用高分辨电感耦合等离子质谱仪(HR-ICP-MS)对其中的铅、砷、镉、铍、铜五种有害元素进行检测,元素的回收率85.2%~110.7%,方法检出限0.3~4.5μg/L,精密度0.9%~4.6%。方法快速简便、准确率高、精密度好。     

汽油辛烷值促进剂T1109D-T1110在国Ⅴ汽油调合中的应用

汽油辛烷值促进剂对甲酰胺基苯乙醚T1109D-T1110是有机无灰类辛烷值促进剂。该剂用于国V标准汽油的调合,可产生明显的经济效益:在研究法辛烷值(RON)为87.2、含抽余油20%的汽油中添加1.9%的T1109D-T1110,可将其调制成92#汽油。与空白汽油相比,RON和抗爆指数有效提高,而其它各项技术指标均无不良变化。     

Phytoplankton development and ecological status during a cyanobacterial bloom in a tributary bay of the Three Gorges Reservoir, China

Reservoirs can provide suitable conditions for cyanobacterial bloom development, which may impact on water quality and biological communities. Weekly surveys in a cyanobacterial bloom process were carried out in the mainstream and Xiangxi Bay of the Three Gorges Reservoir (China), from June 6 to July 18 in 2008. By application of the phytoplankton functional group approach, the spatiotemporal pattern, impact factors, and the ecological status based on Q index (assemblage index) were analyzed. The depth of euphotic layer was apparently the key factor driving the phytoplankton functional group variations. Longitudinal patterns of phytoplankton distribution were detected during this bloom: in the beginning phase, groups D (mainly Stephanodiscus hantzschii) and B (Cyclotella stelligera) dominated in the mainstream of the Three Gorges Reservoir and the mouth area of Xiangxi Bay, group Y (Cryptomonas species) dominated in the upper area, while groups J (mainly Pediastrum duplex), F (mainly Sphaerocystis schroeteri) and G (Pandorina morum and Eudorina elegans) were important in other areas; in the mid phase, group M became absolutely dominant in the whole region; and in the ending phase, besides groups M and Y, groups X2 (Chroomonas acuta, Pyramimonas nanella, etc.) and Lo (Ceratium hirundinella) became more important in the lower and upper area respectively. Generally the ecological status was bad, temporally varied with the bloom process. No spatial difference of ecological status was found in the mainstream, while longitudinal patterns in Xiangxi Bay were detected for different phases: firstly a few sites had relatively better status than the others, then nearly all the sites were in the bad condition, and at last the status in the downstream was better than that in the upstream. The longitudinal patterns of ecological status were related to phytoplankton distribution, disturbed by jacking from the downstream and flood from the upstream of Xiangxi Bay.