全文获取类型
收费全文 | 954篇 |
免费 | 52篇 |
国内免费 | 364篇 |
专业分类
安全科学 | 58篇 |
废物处理 | 55篇 |
环保管理 | 89篇 |
综合类 | 520篇 |
基础理论 | 197篇 |
污染及防治 | 307篇 |
评价与监测 | 28篇 |
社会与环境 | 34篇 |
灾害及防治 | 82篇 |
出版年
2023年 | 16篇 |
2022年 | 53篇 |
2021年 | 41篇 |
2020年 | 30篇 |
2019年 | 27篇 |
2018年 | 45篇 |
2017年 | 47篇 |
2016年 | 45篇 |
2015年 | 71篇 |
2014年 | 82篇 |
2013年 | 98篇 |
2012年 | 95篇 |
2011年 | 96篇 |
2010年 | 69篇 |
2009年 | 61篇 |
2008年 | 66篇 |
2007年 | 58篇 |
2006年 | 40篇 |
2005年 | 38篇 |
2004年 | 21篇 |
2003年 | 25篇 |
2002年 | 26篇 |
2001年 | 26篇 |
2000年 | 23篇 |
1999年 | 26篇 |
1998年 | 22篇 |
1997年 | 20篇 |
1996年 | 22篇 |
1995年 | 22篇 |
1994年 | 11篇 |
1993年 | 9篇 |
1992年 | 8篇 |
1991年 | 9篇 |
1990年 | 8篇 |
1989年 | 3篇 |
1988年 | 6篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
排序方式: 共有1370条查询结果,搜索用时 78 毫秒
481.
气候变化对长江源地区高寒草甸生态系统的影响 总被引:16,自引:1,他引:16
近十几年来,长江源区气候暖干化趋势明显,冰川退缩、湖泊萎缩、草场退化、土地沙漠化、水土流失等环境问题日益严重。高寒草甸是长江源地区主要的植被类型之一,在全球变化影响下,以耐低温寒冷的嵩草属(Kobresia)植物为建群种的高寒草甸将面临更严重的生态胁迫。以长江源地区高寒草甸生态系统为研究对象,采用国际通用的生物地球化学模型模拟高寒草甸生物量、生产力和土壤有机质等的动态变化,并综合考虑人类活动对生态系统生产力和营养元素生物地球化学循环的影响,探讨了全球气候变化对高寒草甸生态系统可能造成的影响。 相似文献
482.
483.
柴油机排气微粒对环境危害严重,研究开发排气过滤技术是解决问题的有效措施之一.利用表面密集排列短纤维的导电泡沫陶瓷作为微粒过滤器的滤芯,对柴油机排气微粒的过滤效率可达90%,并可进行原位通电加热再生,再生后过滤效率不下降.同时,对表面纤维化导电泡沫陶瓷的过滤机理进行了初步探讨. 相似文献
484.
485.
辽宁省大气可吸入颗粒物中重金属及多环芳烃污染特征研究 总被引:4,自引:0,他引:4
为全面了解辽宁省大气可吸入颗粒物污染状况,2004年在省内选取了5个城市进行分季节采样,并对颗粒物中重金属元素含量和美国优先控制的16种多环芳烃(PAHs)进行了定量研究。结果表明,大气PM10和PM2.5中重金属元素和PAHs污染较重,且冬季高于其它季节,重金属元素和PAHs主要富集在PM2.5及以下细小颗粒物中。 相似文献
486.
487.
A toxicity-based method for evaluating safety of reclaimed water for environmental reuses 总被引:1,自引:0,他引:1
A large quantity of toxic chemical pollutants possibly remains in reclaimed water due to the limited removal efficiency in traditional reclamation processes. It is not enough to guarantee the safety of reclaimed water using conventional water quality criteria. An integrated assessment method based on toxicity test is necessary to vividly depict the safety of reclaimed water for reuse. A toxicity test battery consisting of lethality, genotoxicity and endocrine disrupting effect was designed to screen the multiple biological effects of residual toxic chemicals in reclaimed water. The toxicity results of reclaimed water were converted into the equivalent concentrations of the corresponding positive reference substances(EQC). Simultaneously, the predicted no-effect concentration(PNEC) of each positive reference substance was obtained by analyzing the species sensitivity distribution(SSD) of toxicity data. An index "toxicity score" was proposed and valued as 1, 2, 3, or 4 depending on the ratio of the corresponding EQC to PNEC. For vividly ranking the safety of reclaimed water, an integrated assessment index "toxicity rank" was proposed, which was classified into A, B, C, or D rank with A being the safest. The proposed method was proved to be effective in evaluating reclaimed water samples in case studies. 相似文献
488.
Release Characteristics of Nutrients from Polymer-coated Compound Controlled Release Fertilizers 总被引:2,自引:0,他引:2
Reliable information regarding release characteristics of nutrients from a polymer-coated controlled release fertilizer (CRF) is essential for beneficial agronomic and environmental results. Significant knowledge regarding nitrogen release from polymer-coated urea was gained while the information regarding the release of the different nutrients contained in polymer-coated compound N–P–K CRF remains limited. An experiment in which major factors affecting the differential release of nutrients from two coated compound CRF was performed in free water, water saturated sand and sand at field capacity. In general, nitrate release was the fastest, followed by ammonium and potassium whereas phosphate was significantly slower, with a rate of linear release in free water 45–70% slower than that of nitrate. Little differences were obtained for the lag periods of nitrate, ammonium and potassium release (2–10 days) under the experimental conditions, whereas for P they were one order of magnitude larger. The main factor slowing the release was assumed to be the lower solubility of ions with P being the least soluble. Release into free water was, expectedly, somewhat faster than that into saturated sand and significantly faster as compared to sand at field capacity and particularly so for P. Raising the temperature from 20 °C to 40 °C increased the rate of linear release of the different nutrients. The energy of activation, EArel, estimated for the linear release, of the different nutrients, was narrow ranging between 37 to 46 (KJ mol−1) whereas the mean values obtained for the two CRF, differing by 50% in coating thickness, was non-significant. However, EArel was significantly different in different media. The complex effect of temperature on the lag period and nutrient interactions during release deserve further investigation. 相似文献
489.
490.
Concerns over exposure to mercury have motivated the exploration of cost-effective, rapid, and reliable method for monitoring Hg2 + in the environment. Recently, surface-enhanced Raman scattering (SERS) has become a promising alternative method for Hg2 + analysis. SERS is a spectroscopic technique which combines modern laser spectroscopy with the optical properties of nano-sized noble metal structures, resulting in substantially increased Raman signals. When Hg2 + is in a close contact with metallic nanostructures, the SERS effect provides unique structural information together with ultrasensitive detection limits. This review introduces the principles and contemporary approaches of SERS-based Hg2 + detection. In addition, the perspective and challenges are briefly discussed. 相似文献