全文获取类型
收费全文 | 3222篇 |
免费 | 147篇 |
国内免费 | 1215篇 |
专业分类
安全科学 | 185篇 |
废物处理 | 211篇 |
环保管理 | 213篇 |
综合类 | 1840篇 |
基础理论 | 567篇 |
污染及防治 | 1167篇 |
评价与监测 | 124篇 |
社会与环境 | 159篇 |
灾害及防治 | 118篇 |
出版年
2024年 | 3篇 |
2023年 | 38篇 |
2022年 | 129篇 |
2021年 | 117篇 |
2020年 | 108篇 |
2019年 | 79篇 |
2018年 | 96篇 |
2017年 | 155篇 |
2016年 | 164篇 |
2015年 | 232篇 |
2014年 | 228篇 |
2013年 | 297篇 |
2012年 | 275篇 |
2011年 | 269篇 |
2010年 | 203篇 |
2009年 | 221篇 |
2008年 | 234篇 |
2007年 | 207篇 |
2006年 | 158篇 |
2005年 | 110篇 |
2004年 | 101篇 |
2003年 | 115篇 |
2002年 | 102篇 |
2001年 | 98篇 |
2000年 | 107篇 |
1999年 | 105篇 |
1998年 | 110篇 |
1997年 | 105篇 |
1996年 | 111篇 |
1995年 | 73篇 |
1994年 | 65篇 |
1993年 | 54篇 |
1992年 | 41篇 |
1991年 | 19篇 |
1990年 | 15篇 |
1989年 | 12篇 |
1988年 | 9篇 |
1987年 | 7篇 |
1986年 | 2篇 |
1985年 | 5篇 |
1983年 | 3篇 |
1982年 | 2篇 |
排序方式: 共有4584条查询结果,搜索用时 0 毫秒
61.
62.
63.
64.
Suzhen Qi Xue Liu Lizhen Zhu Xiaofeng Chen 《Journal of environmental science and health. Part. B》2018,53(3):171-175
Tebuconazole is a chiral trizole fungicide and widely used in many crops for controlling disease. Tebuconazole is potential toxic to some aquatic organisms but relative information of its isomers is scarce. To detect the endocrine disrupting effects and difference of rac-, R-, and S-tebuconazole, the chitinase activity in Daphnia magna and chitobiase activity in each test medium were used as biomonitors after a 14-day exposure. Results showed that chitinase activity was significantly reduced by rac-, R-, and S-tebuconazole. The chitobiase activity in the test medium was reduced by rac- and R-tebuconazole before day 10, and only one peak was observed at day 10 or day 12 compared with two obvious peaks in the control group (days 6 and 12). S-tebuconazole delayed and reduced the reproduction of D. magna, but did not delay the first chitobiase activity peak, whereas the second peak could not be characterized as the exposure concentration and time increased. Compared with chitinase activity, chitobiase activity can still be used as a rudimentary model for identifying molt-interfering xenobiotics, and further studies should focus on the analysis of correlations between these parameters. 相似文献
65.
O/W型乳化液的处理 总被引:3,自引:0,他引:3
采用药剂破乳-电解破乳工艺处理O/W型乳化液,药剂破乳选用聚合硫酸铁为破乳剂,破乳时最佳PH为8,聚合硫酸铁的最佳投量为1500mg/L,电解破乳选用铁作阳极,铝作阴极,电流密度0.86A/dm^2,极距25mm,电解时间3h。在上述条件下,破乳效果良好,出水清澈透明,COD总去除率可达到96-97%。 相似文献
66.
采用溶胶-凝胶法,在聚苯乙烯(PS)/CdS核壳纳米颗粒表面包覆致密TiO_2层,制备出具有双壳层结构的PS/CdS/TiO_2纳米复合颗粒,考察了制备条件对材料结构的影响,并利用甲基橙溶液对其光催化性能进行了评价。SEM、TEM、XRD和FTIR分析结果表明,制得的微球单分散性良好,壳层包覆完整,厚度均匀。PS/CdS/TiO_2制备的适宜反应时间为12~18 h,适宜反应pH为7~9。PS/CdS/TiO_2较PS/CdS具有更为优异的可见光催化性能。 相似文献
67.
Yibo Zhang Lina Liu Yifei Sun Rong Zhu Xingbao Gao Jingling Yang Zhiqiang Han Hui Wang 《Journal of Material Cycles and Waste Management》2017,19(4):1437-1445
Effects of carbon concentration and Cu additive in simulated fly ash (SFA) and real fly ash (RFA) on the formation of polychlorinated dibenzofurans (PCDFs), polychlorinated dibenzo-p-dioxins (PCDDs), chlorobenzenes, and polychlorinated biphenyls which were all regarded as persistent chlorinated aromatics in iron ore sintering were investigated. In the annealing process of SFA with various carbon contents, the yield of chlorinated aromatics and the I-TEQ obtained their maximum at 10 wt% carbon content. Active carbon in SFA acted as the carbon source as well as an adsorbent which led to higher production of PCDD/F in solid phase at 10 wt% carbon content. The increase of carbon content will be beneficial on the formation of 2,3,7,8-Chloro-substituted PCDF compared with 2,3,7,8-Chloro-substituted PCDD. In addition, the CuCl2·2H2O was a much more powerful catalyst in the formation of chlorinated aromatic compounds compared with elementary Cu, since it served as both a catalyst and a chlorine donor. However, the RFA behaved similarly with SFA with elementary Cu in the formation of chlorinated aromatic compounds. The effect of carbon content and copper additives on formation of 2,3,7,8-chloro-substituted congeners displayed similar characteristics with the tetra- to octa-PCDD/F isomers and even the total PCDD/Fs. 相似文献
68.
Chunfeng Wang Guanfei Chen Yanchen Zhu Dan Yao Wanfeng Wang Lianjun Wang 《Frontiers of Environmental Science & Engineering》2017,11(6):5
Leaching behavior and gastrointestinal bioaccessibility of rare earth elements (REEs) from hospital waste incineration (HWI) fly and bottom ash samples collected from Beijing and Nanjing Cities were assessed. In the same ash sample, the leaching concentrations of individual REEs determined by the Toxicity Characteristic Leaching Procedure (TCLP) were higher than those detected by the European standard protocol (EN-type test), thereby suggesting that the low pH value of leaching solution was an important factor influencing the leachability of REE. The REE bioaccessibility results, which were evaluated using the physiologically based extraction test (PBET), indicated that REEs were highly absorbed during gastric phase by dissolution; and subsequently precipitated and/or re-adsorbed in small intestinal phase. The relative amounts of the total REEs extracted by the TCLP method, EN-type test and PBET test were compared. In addition to the pH value of extraction solutions, the chelating role of REEs with organic ligands used in the PBET method was also an important parameter affecting REE adsorption in human body. Additionally, this study showed that REEs were extracted by these methods as concomitants of heavy metals and anions (NO3 –, F–, SO4 2–, and Cl–) from HWI ash, which probably caused the remarkably complex toxicity on human body by the exposure pathway. 相似文献
69.
Muhammad Shakeel Muhammad Farooq Wajid Nasim Waseem Akram Fawad Zafar Ahmad Khan Waqar Jaleel Xun Zhu Haichen Yin Shuzhong Li Shah Fahad Saddam Hussain Bhagirath Singh Chauhan Fengliang Jin 《Environmental science and pollution research international》2017,24(17):14537-14550
The diamondback moth, Plutella xylostella, is recognized as a widely distributed destructive insect pest of Brassica worldwide. The management of this pest is a serious issue, and an estimated annual cost of its management has reached approximately US$4 billion. Despite the fact that chemicals are a serious threat to the environment, lots of chemicals are applied for controlling various insect pests especially P. xylostella. An overreliance on chemical control has not only led to the evolution of resistance to insecticides and to a reduction of natural enemies but also has polluted various components of water, air, and soil ecosystem. In the present scenario, there is a need to implement an environmentally friendly integrated pest management (IPM) approach with new management tactics (microbial control, biological control, cultural control, mating disruption, insecticide rotation strategies, and plant resistance) for an alternative to chemical control. The IPM approach is not only economically beneficial but also reduces the environmental and health risks. The present review synthesizes published information on the insecticide resistance against P. xylostella and emphasizes on adopting an alternative environmentally friendly IPM approach for controlling P. xylostella in China. 相似文献
70.
Yuan Zhimin Yi Honghong Wang Tianqi Zhang Yiyue Zhu Xiaozhe Yao Jun 《Environmental science and pollution research international》2017,24(27):21877-21884
Environmental Science and Pollution Research - In the present study, heavy metal (HM)-tolerant phosphate solubilizing bacteria (PSB) were isolated and their performance during the remediation of Pb... 相似文献