霸螨灵与Cu2+对蝌蚪的急性毒性试验研究

以蝌蚪为试验材料，采用室内试验方法，研究了霸螨灵和Cu^2＋对蝌蚪的急性毒性和联合毒性。实验结果表明，霸螨灵对蝌蚪的毒性大于Cu^2＋，且两者对于蝌蚪均属高毒物质。     

约束求解的数据模型及算法

此文针对参数化造型系统中约束方程组的求解问题,深入分析了匹配求解的核心思想,提出了一种简单实用的约束网络建模方法,并且围绕该数据模型介绍了与其相关的算法.     

Sequence analytical approach to the Upper Kimmeridgian-Lower Tithonian storm-dominated ramp deposits of the Boulonnais (Northern France). A landward time-equivalent to offshore marine source rocks

An interdisciplinary approach based on high-resolution physical stratigraphy, biostratigraphy, organic matter analysis and clay mineralogy has been applied to the mixed siliciclastic/carbonate Kimmeridgian/Tithonian deposits of the Boulonnais (north-western France). These rocks are the age-equivalents of some of the offshore marine source rocks of the North Sea and were deposited in an overall storm-dominated homoclinal ramp setting which may represent one of the most shore-proximal sediments of this age cropping out in north-western Europe. Comparison with data from the Yorkshire, Dorset, Lorraine and Aquitaine areas allows the discrimination of three major transgressive-regressive sediment packages with disconformities of interregional extent: (1) from the Baylei Zone to top Eudoxus Zone; (2) from the Autissiodorensis Zone to base Scitulus Zone; (3) from the upper Scitulus Zone to the Pectinatus Zone. The lower two regionally correlative disconformities correspond to the sequence boundaries at the top of the Eudoxus Zone and the top of the Autissiodorensis Zone, formed by high-frequency relative sea-level variations during the periods of maximum transgression of the platform. The latter disconformity (the P1 nodule bed) reflects a major tectonically induced reorganization of the north-west European intrashelf sedimentary basin, characterized by a shift in both the location of the main depocentre and the sources of sediment production.     

XII Ecdysone Workshop July 22–26, 1996 Barcelona,Spain

XII Ecdysone Workshop July 22–26, 1996 Barcelona, Spain     

铁路建设对动物生态行为的影响与控制策略

从动物生境的破坏与污染两方面分析了铁路建设对动物生态行为的影响，并从铁路的路线选择、防噪减噪、设置动物通道、加强管理等方面论述了其控制对策。     

Effects of atmospheric gases on terrestrial plants and critical levels of air pollution

An integrated approach was developed to determine the critical levels of air pollution for ecological standard setting based on the unified index of biological response, by taking into account the effects of all pollution components simultaneously. An empirical model of plant productivity was taken as the dose response model for gaseous pollutant effect on the productivity of trees and the annual productivity of plants was used as the above mentioned index. The CO2 increase in the lower atmosphere was considered to potentially increase plant productivity and NO2 was estimated as neutral while being dangerous for plants as a chemical precursor of ozone or as a source of acidification. The maximum permissible chronic O3 and SO2 levels for trees were estimated and it was found that O3 is much more phytotoxic, as compared to SO2 , with a rather narrow range of permissible levels (27-33 ppb) which complicates its monitoring and control.     

宿迁3次突发性空气重污染过程对比分析

利用空气质量资料、常规观测资料、NCEP1.0°×1.0°再分析资料，应用数理统计、天气学等方法对宿迁市3次突发性重污染天气进行对比分析.结果表明：①宿迁"突发"空气重污染时，AQI级别由前一日的一、二级至第2日转为五级以上，AQI值迅速上升.②3次空气重污染过程天气背景相似，高层为宽广平直的偏西气流，地面受高压控制，中低层风向和温度平流突然转变，且都有深厚的逆温层结；持续变化较小的气压梯度、较低风速、温度日较差及相对湿度的增大（150328过程（即2015年3月28日—4月1日污染过程）除外）为颗粒物浓度迅速增长提供了条件.③大气稳定度级别迅速变高和混合层高度迅速降低并维持，对污染物快速聚集有显著影响.④物理量诊断表明，污染发生前期上空为弱上升运动，随后迅速转为下沉运动，或气流下沉运动区域迅速扩大、升高，是空气质量迅速转差的重要动力因素.⑤内蒙古地区的沙尘远距离输送形成的污染，是造成150328过程与另外两次过程明显不同的主要原因.     

基于文献计量的PPP研究趋势与热点分析

近年来,我国在能源、农业、交通运输、市政工程、生态建设和环境保护等领域广泛使用政府和社会资本合作(PPP)模式开展建设和运营。为客观地掌握国内外PPP的研究现状,明确当前的研究前沿与热点问题,笔者基于Web of Science核心合集中的SCI和SSCI数据库,采用文献计量工具Histcite Pro对当前国内外PPP研究工作进行了系统的计量学分析与评价。研究结果表明:PPP研究最早开始于1952年,且从1993年开始文献呈现增加趋势;美国、中国和英国在该领域发表文献最多,且国际上具有较强影响力的单位主要集中在美国境内,我国研究实力较强的有香港理工大学、香港大学、清华大学等;基础设施建设、中国PPP项目、风险、绩效、疾病、药物研发、金融、可持续、公共卫生等是该领域的研究热点。     

杂多化合物脱硫化氢动力学研究

在双搅拌、无浓度梯度气液反应器中考察了磷钼杂多化合物吸收H2S过程的宏观动力学行为.结果表明,吸收剂浓度提高,脱硫效果增强,当磷钼酸钠浓度超过6.25×10-3mol/L后,单一与复配体系对H2S的吸收速率均趋恒定.从工业操作角度来看,6.25×10-3mol/L是适宜的操作浓度温度提高,吸收效果略有降低,但变化幅度不大,实际操作温度可选择常温;进气H2S浓度提高,吸收效果增强.两种脱硫体系中,以复配体系脱硫性能为优.实验测得25℃下反应器中H2S的气、液相传质系数分别为:kGH-2S =8.201×10-10kmol/(m2.s.Pa),kLH-2S=3.440×10-4m/s.吸收反应对磷钼酸钠及硫化氢的反应级数分别为0.339与1.055.     

陆地与海洋气溶胶的相互输送及其对彼此环境的影响

陆地和海洋源产生的气溶胶通过大气的流动向对方的环境系统输送，从而改变了对方环境大气的化学组成，影响着大气污染物的化学反应过程和反应速度，其沉降过程也会对对方的生态系统产生一定的影响。；沿海的岖稠密的人口。较为发达的经济活动，较高的大气污染排放强度，使得陆海气溶胶的交换和沉降对谝我域的环境具有不可忽视的影响。