Use of dimethyl sulfoxide as solubilization agent in the detection of 2,3,7,8-TCDD by radioimmunoassay

Immunoassays are potentially valuable tools for use in screening environmental samples for a broad range of contaminants, such as polychlorinated dibenzo-p-dioxins (PCDDs). The performance of the radioimmunoassay (RIA) for PCDDs was characterized using 4 solubilization systems: Cutscum, Triton, horse serum, and dimethyl sulfoxide (DMSO). The DMSO based assay appeared to perform best at low 2,3,7,8-TCDD levels. The effects of assay incubation time and hapten storage conditions on the DMSO based assay were assessed. The separation of bound from unbound radioactivity was accelerated without adversely affecting assay performance. Further assay development through the use of an alternative labelled hapten is considered.     

直管道电场指纹法有效检测区范围的数值模拟

目的确定电场指纹法应用于直管道时的有效检测区大小。方法采用COMSOL多物理场数值模拟的方法,研究直管道模型在电场指纹检测时的电场分布特征,并探讨电流输入方式、电源电极尺寸、管道尺寸等因素对有效检测区的影响。结果双路电流输入方式能够获得更大的有效检测区,可提高电流利用率及检测效率。有效检测区大小受电源电极尺寸、管道壁厚变化的影响极小,受管道公称直径影响较大。有效检测区与电源电极的最小间距固定,约为管道公称直径的1.5倍。结论确定了电场指纹法应用于直管道时有效检测区的大小,为电场指纹法的管道检测规范的制定提供了科学依据。     

气候旱涝指标方法及其分析

在前人研究的基础上，提出了计算单站旱涝指标和区域旱涝指标的方法。并根据１９５１～１９９６年各月降水资料，对华北地区和长江流域地区的旱涝进行了计算和分析，取得了较好的结果。     

四川省野外探伤的辐射安全现状与对策

本文对四川省的野外探伤单位探伤作业的辐射安全现状进行了调查,分析了野外探伤作业过程中存在的辐射安全问题,提出了野外探伤作业辐射安全监管对策与措施。     

我国东南地区饮用水源地多种农药的赋存特征及健康风险评估

为阐明我国东南地区典型饮用水源地农药类微污染物的污染特征及生态风险,检测评估了某省7个水库的苯并咪唑类、酰胺类、三唑类和有机磷类等19类共55种常用农药的检出频率、检出浓度以及每种农药对于绿藻、水蚤和鱼类这3种不同营养级生物的风险商.在分析的55种农药中,多菌灵和乙草胺的检出频率为100%,12种农药的检出频率在80%以上.多菌灵的检出浓度最高(77.7 ng·L^-1),其次是乙草胺(51.6 ng·L^-1).风险评估结果显示,大部分农药在目标区域都处于低风险状态.对于3种生物来说,乙草胺是绿藻的风险主导型农药,而多菌灵是鱼类和水蚤的风险主导型农药.     

轨道交通车辆段火灾探测系统对比分析

作为轨道交通网中重要的组成部分,轨道交通车辆段如果发生火灾将直接影响着轨道列车的运行。因此,适用于轨道交通车辆段的火灾探测器对保障车辆段的消防安全至关重要。结合城市轨道交通车辆段结构及环境特点,选取了管路采样吸气式和双鉴成像式线性光束式等两种火灾探测器开展了实体火灾实验。实验对比分析了两种火灾探测器在不同火源工况下的响应情况并综合分析了两种火灾探测器的响应性能,从而为实际工程中轨道交通车辆段火灾探测器的选型及布置提供参考。     

气田回注水杀菌剂配方筛选及应用研究

气田回注水中的细菌在大量繁殖过程中会严重损害注水设备及地层,检测西南某气田回注站水样,发现硫酸盐还原菌、腐生菌、铁细菌严重超标,需对其进行杀菌处理,以期达到回注标准要求（SY／T5329—94）。通过研究,筛选出了戊二醛、有机胍等高效的杀菌剂,杀菌剂投加量分别为30ppm时,对水样中的硫酸盐还原菌、腐生菌、铁细菌的杀菌率均达99％,处理后水样满足回注标准要求,在现场应用中也达到相同杀菌效果。     

采气污水中硫酸盐还原菌选育方法及其生长特性研究

从陕北某含菌采气污水中分离一株硫酸盐还原菌的过程中,对三种培养基进行了筛选,对分离出的菌株进行鉴定、数量检测,同时分别用光学显微镜和扫描电镜进行了形态观察。结果表明:该菌株革兰氏染色阴性,芽孢染色阴性,表面不光滑,有鞭毛,作摇摆式运动;菌体呈杆状或弧状,在SRB测试瓶中呈阳性反应,确定该菌株属于脱硫弧菌属(Desulfovibrio)。在适宜条件下,分离得到的SRB在筛选出的培养基中6h后进入对数生长期,48h达到生长最高峰,含菌量为9.5×108个/mL。     

Effects of Diabetic Neuropathy on Body Sway and Slip Perturbation Detection in Older Population

Postural control is a common mechanism to compensate for unexpected displacements of the body. In the older population, a slip or fall due to a failure of postural control is a common cause of morbidity and mortality. The ability of postural control decreases with aging or neuropathy. In this study, 2 groups, diabetics and non-diabetics in the older population, were compared to determine how patterns of postural sway during quiet standing were related to the detection of perturbation. The SLIP-FALLS system was applied to the measurement of sway and detection of perturbation. In phase 1 of the development of the predictive model, neural network algorithms were applied to find determinant variables for perturbation detection. In phase 2, a fuzzy logic inference system was developed to investigate the relationship between sway and perturbation detection. Results of this study may be applied to the design of floor mats or shoe insoles for preventing fatigue in workplaces.