全文获取类型
收费全文 | 3392篇 |
免费 | 233篇 |
国内免费 | 1182篇 |
专业分类
安全科学 | 244篇 |
废物处理 | 210篇 |
环保管理 | 250篇 |
综合类 | 1981篇 |
基础理论 | 578篇 |
环境理论 | 2篇 |
污染及防治 | 1062篇 |
评价与监测 | 157篇 |
社会与环境 | 172篇 |
灾害及防治 | 151篇 |
出版年
2024年 | 7篇 |
2023年 | 76篇 |
2022年 | 187篇 |
2021年 | 196篇 |
2020年 | 152篇 |
2019年 | 96篇 |
2018年 | 155篇 |
2017年 | 165篇 |
2016年 | 176篇 |
2015年 | 196篇 |
2014年 | 295篇 |
2013年 | 342篇 |
2012年 | 286篇 |
2011年 | 302篇 |
2010年 | 211篇 |
2009年 | 213篇 |
2008年 | 242篇 |
2007年 | 160篇 |
2006年 | 188篇 |
2005年 | 148篇 |
2004年 | 89篇 |
2003年 | 111篇 |
2002年 | 81篇 |
2001年 | 85篇 |
2000年 | 104篇 |
1999年 | 86篇 |
1998年 | 87篇 |
1997年 | 76篇 |
1996年 | 72篇 |
1995年 | 57篇 |
1994年 | 44篇 |
1993年 | 32篇 |
1992年 | 43篇 |
1991年 | 13篇 |
1990年 | 8篇 |
1989年 | 6篇 |
1988年 | 8篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1966年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有4807条查询结果,搜索用时 15 毫秒
241.
242.
本文采用多孔陶瓷作为基体制备了锆基金属有机骨架UiO-66@多孔陶瓷复合材料.通过扫描电子显微镜(SEM)、粉末X射线衍射(PXRD)、氮气吸附和傅里叶变换红外光谱(FTIR)等表征手段对比了氢氧化钠脱硅和乙二胺表面改性等基体活化方式对UiO-66(Zr)在多孔陶瓷表面负载情况的影响.结果表明,经过乙二胺表面改性的多孔陶瓷对UiO-66(Zr)的负载更均匀,负载效果更好.以EDTA-Cu(Ⅱ)为考察对象,研究了UiO-66(Zr)@乙二胺表面改性多孔陶瓷复合材料对络合态重金属的净化效能.结果表明,UiO-66(Zr)@多孔陶瓷复合材料在较宽的酸碱条件下(pH=3—9)对络合态重金属EDTA-Cu(Ⅱ)均表现出良好的吸附性能,饱和吸附量为1.17 mg·g~(-1),并可通过NaOH解吸再生,从而实现材料的重复利用. 相似文献
243.
Yilei Lu Yunqing Huang Siyu Zeng Can Wang 《Frontiers of Environmental Science & Engineering》2020,14(2):21
244.
Jiani Yang Xingwen Lu Yuxin Liu Fei Wang Yuanqing Chao 《Environmental science and pollution research international》2020,27(10):10404-10414
This study investigated crystallization mechanisms for the formation of lead aluminosilicate by sintering lead stabilization with kaolin-based precursors. PbAl2Si2O8 was found to be the only stable lead aluminosilicate in low-PbO system and demonstrates its highly intrinsic resistance to acid attack in leaching test. A three-stage PbAl2Si2O8 formation mechanism was supported by the results of the changing temperature in the system. Amorphization of sintered products was observed in both PbO/kaolinite and PbO/mullite systems at 600–700°C. When the temperature was increased to 750–900°C, the crystallochemical formation of lead aluminosilicates (i.e., Pb4Al4Si3O16, Pb6Al6Si2O21, and PbAl2Si2O8) was observed. Pb4Al4Si3O16 and Pb6Al6Si2O21 were found to be the intermediate phases at 700–900°C. Finally, PbAl2Si2O8 was found to be the only crystallite phase to host Pb at above 950°C. A maximum of 80% and 96.7% Pb can be incorporated into PbAl2Si2O8 in PbO/kaolinite and PbO/mullite systems, respectively, but the final products exhibited different microstructures. To reduce environmental hazard of lead, this strategy demonstrated a preferred mechanism of immobilizing lead into PbAl2Si2O8 structure via kaolin-based precursors. 相似文献
245.
Abdelnour Sameh A. Yang Chun-Yan Swelum Ayman A. Abd El-Hack Mohamed E. Khafaga Asmaa F. Abdo Mohamed Shang Jiang-Hua Lu Yang-Qing 《Environmental science and pollution research international》2020,27(31):38472-38490
Environmental Science and Pollution Research - Global warming is considered as the main environmental stress affecting ecosystems as well as physiological and biochemical characteristics, and... 相似文献
246.
分布式能源发电的不确定性给电网公司消纳新能源带来了极大的挑战,电力物联网全域感知技术为分布式能源消纳提供了有效的数据支撑,故提出了一种基于源网荷互动的分布式能源消纳方法,构建了分布式能源总功率预测方法,采用自回归移动平均算法对新能源发电功率进行预测,并建立分布式能源发电波动影响因子,分析新能源发电波动对电网带来的影响。根据源网荷的互动情况,采用离群点自趋优算法,实现新能源机组有功功率精准控制,有效推动分布式能源的消纳。仿真验证表明:采用离群点自趋优的新能源机组控制算法能根据电网运行情况,自动调控分布式能源、电网资源,实现分布式能源最大化消纳,有效提高了园区分布式能源的经济运行水平。 相似文献
247.
盆式绝缘子、绝缘拉杆、支柱绝缘子等绝缘件作为GIS设备内部重要的绝缘、传动部件,故障率仅次于异物放电。通过绝缘拉杆运动特性分析、X射线成像检测、异物分析、微观分析、电场仿真分析等方法,对一起750 kV GIS 设备隔离开关交接试验过程击穿炸裂进行分析。针对分析结果给出了隔离开关的故障原因为连接机构侧的绝缘管粘接面加工操作不当造成了绝缘管层间疏松,导致粘接面存在气隙缺陷,缺陷逐渐延伸扩展,最终诱发绝缘拉杆层间连续放电通道。 相似文献
248.
城镇化过程中的流域面源污染时空变化 总被引:1,自引:0,他引:1
以斧头湖流域为研究对象,在野外调查的基础上,借助遥感和GIS技术,对2008年、2015年斧头湖流域土地利用格局、人畜排放进行分析,利用输出系数模型解析斧头湖的面源污染负荷时空分布及主要来源。结果表明:斧头湖流域2008~2015年面源总氮(TN)和总磷(TP)负荷输出分别从由原来的 2 915 和 178 t 增长至 3 252 和 202 t。城镇化发展使得农村耕地面积减少,耕地对TN的输出贡献比例降低,但是耕地化肥使用依然是TN最主要来源。城镇化使得居民区对面源贡献增大,特别是TP的贡献显著增加。随着人们生活水平的提高,畜禽养殖对面源污染的贡献也显著增加,应予以足够重视 相似文献
249.
Environmental distribution conflicts (EDCs) related to the construction and operation of waste incinerators have become commonplace in China. This article presents a detailed case study of citizen opposition to an incinerator in the village of Panguanying, Hebei Province. Drawing on in-depth fieldwork, we show how this case was notable, because it transcended the local arena to raise bigger questions about environmental justice, particularly in relation to public participation in siting decisions, after villagers exposed fraudulent public consultation in the environmental impact assessment. An informal network between villagers and urban environmental activists formed, enabling the Panguanying case to exert influence far beyond the village locality. This network was critical in creating wider public debate about uneven power and substandard public participation in siting disputes, a central feature in many Chinese EDCs. By transcending local specificities and exposing broader, systemic inadequacies, this case became instrumental in supporting “strong sustainability”. 相似文献
250.
Zhaoxia Chu Guijian Liu Zhongbing Dong Xianwen Lu Guangzhou Chen Fugeng Zha 《Environmental monitoring and assessment》2018,190(1):36
Copper mine tailings pose many threats to the surrounding environment and human health, and thus, their remediation is fundamental. Coal spoil is the waste by-product of coal mining and characterized by low levels of metals, high content of organic matter, and many essential microelements. This study was designed to evaluate the role of coal spoil on heavy uptake and physiological responses of Lolium perenne L. grown in copper mine tailings amended with coal spoil at rates of 0, 0.5, 1, 5, 10, and 20%. The results showed that applying coal spoil to copper mine tailings decreased the diethylenetriaminepentaacetic acid (DTPA)-extractable Cd, Cu, Pb, and Zn contents in tailings and reduced those metal contents in both roots and shoots of the plant. However, application of coal spoil increased the DTPA-extractable Cr concentration in tailings and also increased Cr uptake and accumulation by Lolium perenne L. The statistical analysis of physiological parameters indicated that chlorophyll and carotenoid increased at the lower amendments of coal spoil followed by a decrease compared to their respective controls. Protein content was enhanced at all the coal spoil amendments. When treated with coal spoil, the activities of superoxide dismutases (SOD), peroxidase (POD), and catalase (CAT) responded differently. CAT activity was inhibited, but POD activity was increased with increasing amendment ratio of coal spoil. SOD activity increased up to 1% coal spoil followed by a decrease. Overall, the addition of coal spoil decreased the oxidative stress in Lolium perenne L., reflected by the reduction in malondialdehyde (MDA) contents in the plant. It is concluded that coal spoil has the potential to stabilize most metals studied in copper mine tailings and ameliorate the harmful effects in Lolium perenne L. through changing the physiological attributes of the plant grown in copper mine tailings. 相似文献