全文获取类型
收费全文 | 325篇 |
免费 | 14篇 |
国内免费 | 58篇 |
专业分类
安全科学 | 40篇 |
废物处理 | 15篇 |
环保管理 | 64篇 |
综合类 | 175篇 |
基础理论 | 25篇 |
污染及防治 | 49篇 |
评价与监测 | 18篇 |
社会与环境 | 8篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 3篇 |
2022年 | 1篇 |
2021年 | 6篇 |
2020年 | 6篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 6篇 |
2016年 | 9篇 |
2015年 | 4篇 |
2014年 | 13篇 |
2013年 | 32篇 |
2012年 | 23篇 |
2011年 | 22篇 |
2010年 | 24篇 |
2009年 | 16篇 |
2008年 | 15篇 |
2007年 | 38篇 |
2006年 | 22篇 |
2005年 | 14篇 |
2004年 | 17篇 |
2003年 | 17篇 |
2002年 | 15篇 |
2001年 | 21篇 |
2000年 | 20篇 |
1999年 | 10篇 |
1998年 | 8篇 |
1997年 | 4篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1988年 | 2篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有397条查询结果,搜索用时 297 毫秒
91.
92.
The aim of this work was to evaluate the Ames assay and mixed function oxidase (MFO)-Induct Test used in parallel with chemical group tests (ECD fingerprint and PAH estimation) for the characterization of the organic pollution of water sediment materials. Sediment materials were collected from “clean” and relatively heavily polluted locations in the Middle Adriatic Sea, and from some locations in continental Croatia polluted with wastewaters from different enterprises. Characterization of the organic extracts of the sediment materials investigated was performed chemically using UV spectrofluorometry for the determination polyaromatic hydrocarbons (PAH) and gas chromatography for the determination of volatile EC detector sensitive materials. Genotoxic analysis of the extracts was performed using the MFO-Induct Test and mutagenicity testing using the Standard Plate Incorporation Test as described by Maron and Ames with Salmonella typhimurium TA 98. Measurement of the BaPMO enzyme activity in the livers of carp treated i.p. with total extracts of the sediment investigated confirmed that the methanol extracts generally contained more inducing matter than the petroleum ether extracts. Ames assay showed that for all the samples following the elimination of the sulfur, there was an increase in the number of revertants in comparison to the control number, which indicates that the samples contained mutagenic substances. The larger doses of extracts generally demonstrated cytotoxicity, as evidenced by a reduced number of spontaneous revertants in the Salmonella/Microsome Test. Investigation of the correlation of the chemical parameters with the biological parameter showed that the induction of BaPMO exhibited a statistically significant correlation with the level of the ECD fingerprint of the petroleum ether sediment extract. 相似文献
93.
造纸行业是资金密集型、技术密集型产业,企业能耗、水耗、资源消耗很大。随着产品产量的增加,行业污染物排放重势必存在增长趋势,造纸行业清洁生产潜力巨大,造纸项目环境影响评价中的清洁生产水平评价变得越来越重要。就造纸行业环境影响评价中清洁生产水平评价的评价指标、评价方法、评价工作中遇到的实际问题以及当前形势对环境影响评价的更高要求以及应对办法等进行了论述。 相似文献
94.
为适应地质资料汇交要求,提高汇交地质资料的质量,本文以华东地区为例,分析了地质资料汇交中存在的问题,并提出几点改进意见。 相似文献
95.
介绍了几种废纸资源化的新技术:生产木材、制作农用育苗盒,改善土壤土质、生产动物饲料,采用生物技术生产乳酸等化工产品,生产各种功能材料如复合材料、新型建筑和装饰材料,包装材料、保温材料、耐火材料和除油材料,制造家庭用品和文具,用作燃料。并指出了废纸资源化的发展方向。 相似文献
96.
Agro-based pulp and paper mills in India are one of the most polluting industries; in addition, they are high consumers of raw water. Growing scarcity of high quality freshwater as well as stringent regulatory standards is compelling these units to explore appropriate water management options. Based on data obtained through a questionnaire survey and plant visits, this work provides an overview of the water use and effluent treatment status in Indian agro-residue and recycled pulp and paper mills. The challenges faced by this sector are reviewed and practices adopted by progressive units to minimize freshwater use are illustrated through case studies. 相似文献
97.
S. Höss W. Ahlf H. Hollert M. Hammers-Wirtz 《Environmental pollution (Barking, Essex : 1987)》2010,158(9):2999-3010
Freshwater sediments with low levels of anthropogenic contamination and a broad range of geochemical properties were investigated using various sediment-contact tests in order to study the natural variability and to define toxicity thresholds for the various toxicity endpoints. Tests were performed with bacteria (Arthrobacter globiformis), yeast (Saccharomyces cerevisiae), nematodes (Caenorhabditis elegans), oligochaetes (Lumbriculus variegatus), higher plants (Myriophyllum aquaticum), and the eggs of zebrafish (Danio rerio). The variability in the response of some of the contact tests could be explained by particle size distribution and organic content. Only for two native sediments could a pollution effect not be excluded. Based on the minimal detectable difference (MDD) and the maximal tolerable inhibition (MTI), toxicity thresholds (% inhibition compared to the control) were derived for each toxicity parameter: >20% for plant growth and fish-egg survival, >25% for nematode growth and oligochaete reproduction, >50% for nematode reproduction and >60% for bacterial enzyme activity. 相似文献
98.
T. Matsuda M. Yashima M. Nifuku H. Enomoto 《Journal of Loss Prevention in the Process Industries》2001,14(6):449-453
The dust explosion committee of the Association of Powder Process Industry and Engineering, Japan recently established two testing standards for dust explosions. In the investigations for the standardization, many experimental data have been obtained for the dusts currently used in Japanese industries. Data for zirconium, tantalum and silicone dusts are presented to discuss the use of test methods, which have been accepted internationally. The test methods for dust explosions have to consider a variety of kinds and forms of dusts to be tested. 相似文献
99.
造纸污泥硫化氢释放量及控制研究 总被引:1,自引:0,他引:1
研究TCuSO_4、NaClO、KMnO_4、H_2O_2处理液及其浓度对造纸污泥硫化氢释放量的影响.结果表明.随各处理液浓度增大,硫化氢释放量有不同程度的减少;各种处理液均能明显降低造纸污泥硫化氢释放量,效果从好到差依次为CuSO_4、NaClO、KMnO_4、H_2O_2;CuSO_4的除臭机制是铜离子抑制细菌生长,同时与硫化氢反应生成不溶的CuS;而NaClO、KMnO_4、H_2O_2除臭机制是抑制细菌生长和氧化硫化氢产生单质硫;干污泥硫化氢释放量比湿污泥大. 相似文献
100.
Syed Ashfaq Nabi Ajay Gupta 《Journal of environmental science and health. Part. B》2013,48(2):239-254
Abstract Paper electrophoretic movements of a number of pesticides belonging to organophosphorus, organochlorine and pyethroid groups in various acid background electrolytes have been studied. The effect of pH and pKa of the acids on the movement of these pesticides have also been studied. It has been observed that the movement of most of the pesticides is enhanced with increase in the degree of ionisation of the acids (pKa) studied as background electrolytes. The movement also increases with increase in the pH of acids. On the basis of differential movement of pesticides towards cathode and anode, a number of separations have been achieved from binary mixtures. Monocrotophos, rogor and malathion have been determined quantitatively (28.6 ‐ 29.2 μg) in alcoholic extracts of soil samples. 相似文献