In vitro and in vitro toxicity study of diesel exhaust particles using BEAS-2B cell line and the nematode Caenorhabditis elegans as biological models

Environmental Science and Pollution Research - It is well accepted that diesel exhaust particles (DEPs) are highly associated with improper function of organ systems. In this study, DEP toxicity...     

采用氢氧化钠溶液循环浸出法脱除高砷阳极泥中的砷

采用氢氧化钠溶液循环浸出法处理高砷阳极泥（简称阳极泥），考察了氢氧化钠溶液与阳极泥质量比（简称液固比）等因素对限极泥中砷、锑、铅浸出率的影响。在液固比为5、氢氧化钠浓度为2．0moL／L、反应温度为70～85℃、反应时间为8h的条件下，砷浸出率可达95％以上；含砷浸出液经硫化钠沉砷后可返回浸出工序重复使用，在硫化钠与砷质量比大于3时，浸出液沉砷率维持在80％以上，同时回用浸出工序后，砷浸出率达95％以上，且铅、锑流失率较低。     

深圳妈湾排海工程非设计条件下泥沙沉积分析

本文在物理模型试型的基础上，通过理论分析和试验结果的相互验证，认为“悬浮指标”和“水流挟沙力”可作为泥沙沉积之水力条件的有效判据，且提供了判断方法，并由此得出了深圳妈湾排海工程防止泥沙沉积的临界排放流量，最后提出了防止泥沙沉积的运行管理防范措施和建议。     

蓝牙技术及其应用

蓝牙技术是一种无线通信标准,它利用无线链路在各种数字设备之间实现短距离、小功耗、低成本的话音和数据通信。本文讨论了它的起源、技术特点、组网、协议体系及其广阔的应用前景。     

浅谈运油船舶的火灾危险性及防火措施

运油船舶具有油舱多、输油加油线多和输水管线多的特点,而且不同的管道一般都互相交织.近年来,国内航道发生多起运油船舶火灾事故,造成了严重的财产损失和人员伤亡.笔者结合工作实际,就如何做好运油船舶消防安全管理工作谈几点认识.     

SBR改良工艺处理北京市城乡结合部污水的研究

通过采用SBR改良工艺处理城乡结合部生活污水的试验,根据城乡结合部污水的特点,采用SBR改良工艺,研究工艺的处理效果、水量波动和排水位置对处理效果的影响。结果表明,SBR改良工艺对城乡结合部污水有良好的处理效果;SBR改良工艺耐冲击负荷能力大,在连续2倍进水量的情况下,仍有良好的处理效果;降低排水位置对出水SS有一定的影响,但SBR工艺的污泥沉降效果好。     

基于BP神经网络的企业HSE管理绩效评估

提出了根据日常HSE过程考核指标,构建基于BP神经网络的评价模型,利用神经网络较强的自培训学习、模糊推理、非线性逼近及容错能力,探索日常HSE过程考核指标与HSE绩效评估之间的函数关系,获得较为满意的绩效评估结果。经过对评估模型的评价及检验,该方法具有较好的操作性和较高的准确性。     

钻井抽吸和激动压力安全系数分析

基于流体力学和波动压力理论,研究了抽吸、激动压力安全系数的计算方法,分析结果表明,抽吸、激动压力随钻井液黏度、密度、井深的增加而增大,且与钻柱上、下行速度密切相关;大井眼中抽吸、激动压力较小,小井眼抽吸、激动压力较大;地层渗透性在一定程度也会影响抽吸、激动安全系数的取值。为不同地层钻井时合理安全地设计与调整钻井液密度,减少储层伤害提供了理论基础．     

新型颗粒粉煤灰净水剂对六价铬的吸附

采用自制颗粒粉煤灰净水剂,研究其对水溶液中的六价铬离子的吸附性能和影响因素,探讨了该净水剂对六价铬的吸附机理。研究表明:颗粒粉煤灰能有效吸附水溶液中的六价铬离子;影响吸附效果的因素重要性顺序为:pH>净水剂投加量>振荡时间>温度;该净水剂对六价铬吸附与Langmuir吸附等温方程和Freundlich吸附等温方程均很吻合,属于单分子层吸附;液膜扩散起主要作用,吸附过程符合二级动力学方程。     

Investigation of carbonyl compound sources at a rural site in the Yangtze River Delta region of China

Carbonyl compounds are important intermediates in atmospheric photochemistry, but their primary sources are still not understood well. In this work, carbonyls, hydrocarbons,and alkyl nitrates were continuously measured during November 2011 at a rural site in the Yangtze River Delta region of China. Mixing ratios of carbonyls and hydrocarbons showed large fluctuations during the entire measurement. The average level for total measured volatile organic compounds during the pollution episode from 25 th to 27 th November, 2011 was 91.6 ppb, about 7 times the value for the clean period of 7th–8th, November, 2011. To preliminarily identify toluene sources at this site, the emission ratio of toluene to benzene(T/B) during the pollution episode was determined based on photochemical ages derived from the relationship of alkyl nitrates to their parent alkanes. The calculated T/B was5.8 ppb/ppb, significantly higher than the values of 0.2–1.7 ppb/ppb for vehicular exhaust and other combustion sources, indicating the dominant influence of industrial emissions on ambient toluene. The contributions of industrial sources to ambient carbonyls were then calculated using a multiple linear regression fit model that used toluene and alkyl nitrates as respective tracers for industrial emission and secondary production. During the pollution episode, 18.5%, 69.0%, and 52.9% of measured formaldehyde, acetaldehyde, and acetone were considered to be attributable to industrial emissions. The emission ratios relative to toluene for formaldehyde, acetaldehyde, and acetone were determined to be 0.10, 0.20 and0.40 ppb/ppb, respectively. More research on industrial carbonyl emission characteristics is needed to understand carbonyl sources better.