铝、铁共聚作用的化学特征及晶貌研究

通过对铝，铁水解共聚物的合成制备及其水解共聚合过程电位滴定的研究，并通过扫描电镜对其共聚物样品的晶貌观测，ｎＡｌ／ｎＦｅ的点能谱及结构组成的红外光谱测定，对铝铁共聚作用的化学特征及其晶形貌象，共聚作用进行了研究及讨论，为深入研究铝无机共聚溶液体系化学形态组成及其絮凝剂的提供了的基础实验依据。     

越南的可持续能源网络

越南的可持续能源网络ＳｕｓｔａｉｎａｂｌｅＥｎｅｒｇｙＮｅｔｗｏｒｋｉｎＶｉｅｔｎａｍ￥ＮｇｕｙｅｎＤｕｃＬｏｃＡｂｓｔｒａｃｔ：Ｔｈｅａｕｔｈｏｒｄｅｓｃｒｉｂｅｓｔｈｅａｉｍｓａｎｄａｃｔｉｖｉｔｉｅｓｏｆａｎｅｔｗｏｒｋｅｓｔａｂｌｉｓｈｅｄｔ...     

安全知识测试不能走过场

有的企业在组织职工进行安全知识测试时,把试题和答案一道印发下去，让职工在答题卡上对照填涂，使得部分职工连测试题目都不愿意看，直接把别人的答题卡拿来照猫画虎地进行填写，虽然参与了答题活动,但根本不知道测试内容是什么；有的在组织职工安全知识测试时，图省事，不是把答卷发给每一名职工，而是找几个人集中替大家填写后统一交给组织单位，使得大部分职工根本没有机会参与测试活动,等等。     

QSAR法研究取代苯酚的生物活性

基于表征成键原子的生物活性特征值Ai构建取代苯酚的自相关拓扑指数tT,并以0T1、T为结构描述符,分别建立了取代苯酚诱发浮萍萎黄、对日本长腿蛙蝌蚪的QSAR模型:pC=-2.4591+0.51730T-6.3888×10-21T,r=0.9778;24h-LC50=2.1269+1.1013×10-20T+3.4552×10-41T2,r=0.9676.它们的估算结果均优于文献结果,用Jackknife法检验,以上模型具有总体稳健性。     

Spatial variations in daily average CO2 concentrations above wetland surface of Xianghai National Nature Reserve, China

Horizontal and vertical variations of daily average CO2 concentration above the wetland surface were studied in Xianghai National Nature Reserve of China in August, 2000. The primary purpose was to study spatial distribution characteristics of CO2 concentration on the four levels of height(0.1 m, 0.6 m, 1.2 m and 2 m) and compare the differences of CO2 concentration under different land covers. Results showed that daily average CO2 concentration above wetland surface in Xianghai National Natural Reserve was lower than that above other wetlands in northeast China as well as the worldwide average, suggesting that Xianghai wetland absorbed CO2 in August and acted as“sink” of CO2. The horizontal variations on the four levels of height along the latitude were distinct, and had the changing tendency of“decreasing after increasing” with the increase of height. The areas with obvious variations were consistent on different levels of height,and those with the highest variations appeared above surface of shore, sloping field, Typha wetland and Phragmites wetland; the vertical variations were greatly different, with the higher variations in Phragmites wetland and Typha wetland, and the lands near the shore and the sloping field with the lower variations. Spatial variations of daily average CO2 concentrations above wet!and surface were affected by surface qualities and land covers.     

偏二甲肼污染及治理方法评价

阐述了偏二甲肼 (Unsymmetricaldimethyl-hydrazine ,简称UDMH)对人体致毒机理 ,对环境的污染特征 ,着重对偏二甲肼污染治理中的臭氧氧化法、自然降解法、离子树脂交换法、活性炭吸附法等技术进行了综合评价 ,并提出了TiO2 光催化氧化法及光和细菌降解偏二甲肼的研究方向。     

农业生态环境中的锰元素

论述了锰元素的地球化学特征和分布，农作物与锰元素的关系以及锰元素有效态含量的制约因素：土壤的含量、土壤的酸碱度、土壤的氧化还原环境、土壤的有机质含量。     

蒸气爆炸系列讲座第六讲锅炉爆炸

前几讲介绍的水蒸气爆炸、低温液化气蒸气爆炸及原油沸溢等属于传热型的蒸气爆炸.本讲的锅炉爆炸则是属于平衡破坏型.平衡破坏型蒸气爆炸的特征是在高压密闭容器内存在着具有高于常压蒸气压的液体而发生的事故.如果密闭容器内液体温度升到临界温度以上,那么,容器内将不存在液体,也就不会发生蒸气爆炸[1].     

试论江河泥沙灾的生态环境评估

本文描述了江河泥沙灾害的过程，特征及成因，认为江河泥沙灾害尾于非突发性的灾害，亦即生态环境这害。它具有孕育，发生，发展的全过程，分析了江河泥潲灾害不同于传统灾害的基本原因。