全文获取类型
收费全文 | 1617篇 |
免费 | 64篇 |
国内免费 | 669篇 |
专业分类
安全科学 | 120篇 |
废物处理 | 92篇 |
环保管理 | 132篇 |
综合类 | 940篇 |
基础理论 | 299篇 |
污染及防治 | 595篇 |
评价与监测 | 48篇 |
社会与环境 | 45篇 |
灾害及防治 | 79篇 |
出版年
2024年 | 2篇 |
2023年 | 26篇 |
2022年 | 84篇 |
2021年 | 67篇 |
2020年 | 49篇 |
2019年 | 38篇 |
2018年 | 57篇 |
2017年 | 72篇 |
2016年 | 82篇 |
2015年 | 73篇 |
2014年 | 132篇 |
2013年 | 159篇 |
2012年 | 156篇 |
2011年 | 128篇 |
2010年 | 116篇 |
2009年 | 113篇 |
2008年 | 128篇 |
2007年 | 108篇 |
2006年 | 90篇 |
2005年 | 77篇 |
2004年 | 34篇 |
2003年 | 60篇 |
2002年 | 59篇 |
2001年 | 49篇 |
2000年 | 48篇 |
1999年 | 58篇 |
1998年 | 53篇 |
1997年 | 43篇 |
1996年 | 39篇 |
1995年 | 38篇 |
1994年 | 22篇 |
1993年 | 25篇 |
1992年 | 20篇 |
1991年 | 14篇 |
1990年 | 6篇 |
1989年 | 7篇 |
1988年 | 8篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
排序方式: 共有2350条查询结果,搜索用时 312 毫秒
851.
Lu Li Bing Yuan Shi-Wei Liu Shi-Tao Yu Cong-Xia Xie Fu-Sheng Liu Li-Juan Shan 《Journal of Polymers and the Environment》2012,20(2):388-394
Chitosan oligomers because of its water solubility has some special physiological functions, such as binding lipid, affecting the mitogenic response, restraining the growth of tumors, and was widely used in cosmetics and health. H2O2/Gly (Glycine) series ionic liquids system, a new solvable-catalytic system, was an efficient clean process for preparation of chitosan oligomers. The effects of the anions of Gly series ionic liquids on the solubility and degradation for chitosan were investigated, and the results showed that [Gly]Cl aqueous solution was of good solubility and assistant degradation for chitosan. In additional, the mechanism for oxidative degradation of chitosan in ionic liquids (ILs) was studied. The effect on the property of chitosan oligomers catalyzed by H2O2, in two different kinds of solvents (HAc and [Gly]Cl) were compared. It was found that the performance of moisture absorption and retention of chitosan oligomers using ionic liquid aqueous solution as solvent was better than that using HAc aqueous solution as solvent, and even superior to that of hyaluronic acid. Furthermore, [Gly]Cl could be easily separated from the product and reused with only slight loss. It could provide an efficient and environmental friendly method for the preparation of chitosan oligomers in H2O2/ILs system. 相似文献
852.
853.
854.
以现场注水试验和实验室实验结果为依据,分析并讨论了目前研究甚少而又对注水防尘实施,特别是在软煤层综放工作面实施很重要的工艺问题,提出了适宜的钻孔、封孔、润湿效果考察方法以及表面活性剂应用中的浓度选择、种类选择和应用的必要性评价方法 相似文献
855.
856.
Haiguang Zhang Lei Du Jiajian Xing Gaoliang Wei Xie Quan 《Frontiers of Environmental Science & Engineering》2023,17(5):59
857.
Mourin Jarin Zeou Dou Haiping Gao Yongsheng Chen Xing Xie 《Frontiers of Environmental Science & Engineering》2023,17(2):16
858.
Xiaoying Wang Haiguang Zhang Xu Wang Shuo Chen Hongtao Yu Xie Quan 《Frontiers of Environmental Science & Engineering》2023,17(1):1
859.
860.
Yufei Hu Jun Chen Huihui Fan Ping Xie Jun He 《Environmental science and pollution research international》2016,23(8):7211-7219
Cyanobacterial blooms-produced microcystins are secondary metabolites which can accumulate in the food chain and contaminate water, thus posing a potential threat to the health of aquatic animals and even humans. Microcystin toxicity affects not only the liver but also the other organs, i.e., the brain. The serious neurotoxicity effects caused by microcystins then lead to various symptoms. This review focuses on the neurotoxicity of microcystins. Microcystins can cross blood-brain barrier with the transport of Oatps/OATPs, causing neurostructural, functional, and behavioral changes. In this review, potential uptake mechanisms and neurotoxicity mechanisms are summarized, including neurotransmissions, neurochannels, signal transduction, oxidative stress, and cytoskeleton disruption. However, further researches are needed for detailed studies on signaling pathways and the downstream pathways of neurotoxicity of microcystins. 相似文献