全文获取类型
收费全文 | 6791篇 |
免费 | 285篇 |
国内免费 | 683篇 |
专业分类
安全科学 | 858篇 |
废物处理 | 103篇 |
环保管理 | 1217篇 |
综合类 | 4274篇 |
基础理论 | 325篇 |
污染及防治 | 533篇 |
评价与监测 | 284篇 |
社会与环境 | 80篇 |
灾害及防治 | 85篇 |
出版年
2024年 | 16篇 |
2023年 | 59篇 |
2022年 | 112篇 |
2021年 | 145篇 |
2020年 | 150篇 |
2019年 | 191篇 |
2018年 | 80篇 |
2017年 | 93篇 |
2016年 | 189篇 |
2015年 | 228篇 |
2014年 | 623篇 |
2013年 | 420篇 |
2012年 | 457篇 |
2011年 | 541篇 |
2010年 | 450篇 |
2009年 | 511篇 |
2008年 | 498篇 |
2007年 | 443篇 |
2006年 | 385篇 |
2005年 | 365篇 |
2004年 | 330篇 |
2003年 | 309篇 |
2002年 | 215篇 |
2001年 | 146篇 |
2000年 | 175篇 |
1999年 | 112篇 |
1998年 | 103篇 |
1997年 | 67篇 |
1996年 | 68篇 |
1995年 | 81篇 |
1994年 | 53篇 |
1993年 | 41篇 |
1992年 | 32篇 |
1991年 | 26篇 |
1990年 | 29篇 |
1989年 | 16篇 |
排序方式: 共有7759条查询结果,搜索用时 15 毫秒
31.
小城镇生活污水问题往往由于治理资金不足、人们水环境保护意识淡薄等原因得不到正确的处理,导致水体水质逐年下降。随着我国社会主义新经济建设的不断推进,解决小城镇生活污水问题具有重要的现实意义,加强对小城镇生活污水处理技术的研究,创新污水处理模式也是刻不容缓。本文结合生物滴滤池的特点,介绍了复合式生物滴滤池技术的优越性,并就该技术在实践中的应用进行了探讨。 相似文献
32.
本文从填埋场选址、底层防渗、渗滤液收集处理、大气污染控制、生态恢复等方面探讨了城市生活垃圾填埋场项目环评阶段的要点。 相似文献
33.
34.
35.
36.
曝气生物滤池是一种新型的废水处理应用技术,集生物氧化、生物絮凝、过滤、反冲洗更新等功能于一体[1],非常适合我国目前水资源紧缺的现状。本文从运行方式方面通过间歇曝气考察分析了曝气生物滤池的污水处理效果,试验结果研究表明:不同的曝气时间和间歇时间对有机物、氨氮的去除效果和效率明显不同,选择合适的时间能够使去除效果达到最好。本文去除实验研究数据能够为以后生物过滤处理生活污水方面提供借鉴和支持。 相似文献
37.
38.
39.
Xuejun Guo Kunpeng Wang Mengchang He Ziwei Liu Hailin Yang Sisi Li 《环境科学学报(英文版)》2014,26(7):1549-1556
A large amount of solid waste has been produced by the antimony smelting process in the"World Capital of Antimony", Xikuangshan area in China. This study comprehensively investigated the physical and chemical characteristics of the various solid wastes, as well as the leaching behavior of the solid wastes, which included water-quenched slag,arsenic-alkali residue, desulfurized slag and blast furnace dust. These four types of waste were enriched in a variety of heavy metals and metalloids and more specifically with As and Sb levels up to 8.6 × 104 and 3.16 × 105mg/kg, respectively, in arsenic-alkali residue. For desulfurized slag and water-quenched slag, the leaching concentration of Sb significantly exceeded the acceptable limits during the leaching tests using the toxicity characteristic leaching procedure and the synthetic precipitation leaching procedure. In addition, As leaching in arsenic-alkali residue was extraordinarily hazardous, being three orders of magnitude higher than the regulatory level of As. According to the results of the extraction tests, all the tested wastes were classified as hazardous waste. 相似文献
40.
Taste and odor (T/O) in drinking water often cause consumer complaints and are thus regulated in many countries. However, people in different regions may exhibit different sensitivities toward WO. This study proposed a method to determine the regional drinking water odorant regulation goals (ORGs) based on the odor sensitivity distribution of the local population. The distribution of odor sensitivity to 2-methylisobomeol (2-MIB) by the local population in Beijing, China was revealed by using a normal distribution function/model to describe the odor complaint response to a 2-MIB episode in 2005, and a 2-MIB concentration of 12.9 ng/L and FPA (flavor profile analysis) intensity of 2.5 was found to be the critical point to cause odor complaints. Thus the Beijing ORG for 2-MIB was determined to be 12.9 ng/L. Based on the assumption that the local FPA panel can represent the local population in terms of sensitivity to odor, and that the critical FPA intensity causing odor complaints was 2.5, this study tried to determine the ORGs for seven other cities of China by performing FPA tests using an FPA panel from the corresponding city. ORG values between 12.9 and 31.6 ng/L were determined, showing that a unified ORG may not be suitable for drinking water odor regulations. This study presents a novel approach for setting drinking water odor regulations. 相似文献