全文获取类型
收费全文 | 4194篇 |
免费 | 218篇 |
国内免费 | 1660篇 |
专业分类
安全科学 | 285篇 |
废物处理 | 290篇 |
环保管理 | 293篇 |
综合类 | 2532篇 |
基础理论 | 670篇 |
环境理论 | 2篇 |
污染及防治 | 1513篇 |
评价与监测 | 153篇 |
社会与环境 | 137篇 |
灾害及防治 | 197篇 |
出版年
2024年 | 8篇 |
2023年 | 80篇 |
2022年 | 214篇 |
2021年 | 183篇 |
2020年 | 147篇 |
2019年 | 115篇 |
2018年 | 147篇 |
2017年 | 214篇 |
2016年 | 200篇 |
2015年 | 242篇 |
2014年 | 300篇 |
2013年 | 422篇 |
2012年 | 351篇 |
2011年 | 355篇 |
2010年 | 281篇 |
2009年 | 291篇 |
2008年 | 305篇 |
2007年 | 266篇 |
2006年 | 229篇 |
2005年 | 180篇 |
2004年 | 123篇 |
2003年 | 148篇 |
2002年 | 168篇 |
2001年 | 101篇 |
2000年 | 124篇 |
1999年 | 146篇 |
1998年 | 115篇 |
1997年 | 106篇 |
1996年 | 102篇 |
1995年 | 111篇 |
1994年 | 82篇 |
1993年 | 69篇 |
1992年 | 48篇 |
1991年 | 33篇 |
1990年 | 14篇 |
1989年 | 6篇 |
1988年 | 15篇 |
1987年 | 3篇 |
1986年 | 5篇 |
1985年 | 2篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 9篇 |
1981年 | 3篇 |
1976年 | 1篇 |
排序方式: 共有6072条查询结果,搜索用时 15 毫秒
201.
Environmental Geochemistry and Health - The causes of Kashin–Beck disease (KBD) in children are multifactorial, and particular consideration has been given to childhood selenium (Se)... 相似文献
202.
Kun Zhang Jialuo Xu Qing Huang Lei Zhou Qingyan Fu Yusen Duan Guangli Xiu 《Frontiers of Environmental Science & Engineering》2020,14(6):92
203.
Environmental Fluid Mechanics - A hydraulic jump forming in the stilling basin at the base of a high-head dam spillway is often characterized by high Froude number and inflow pre-aeration... 相似文献
204.
205.
Reem Hajjar Peter Cronkleton Emily Etue Peter Newton Aaron J.M. Russel Januarti Sinarra Tjajadi Wen Zhou Arun Agrawal 《Conservation biology》2016,30(6):1357-1362
Conservation and development practitioners increasingly promote community forestry as a way to conserve ecosystem services, consolidate resource rights, and reduce poverty. However, outcomes of community forestry have been mixed; many initiatives failed to achieve intended objectives. There is a rich literature on institutional arrangements of community forestry, but there has been little effort to examine the role of socioeconomic, market, and biophysical factors in shaping both land‐cover change dynamics and individual and collective livelihood outcomes. We systematically reviewed the peer‐reviewed literature on community forestry to examine and quantify existing knowledge gaps in the community‐forestry literature relative to these factors. In examining 697 cases of community forest management (CFM), extracted from 267 peer‐reviewed publications, we found 3 key trends that limit understanding of community forestry. First, we found substantial data gaps linking population dynamics, market forces, and biophysical characteristics to both environmental and livelihood outcomes. Second, most studies focused on environmental outcomes, and the majority of studies that assessed socioeconomic outcomes relied on qualitative data, making comparisons across cases difficult. Finally, there was a heavy bias toward studies on South Asian forests, indicating that the literature on community forestry may not be representative of decentralization policies and CFM globally. 相似文献
206.
207.
The inhibition and dispersion of polyepoxysuccinate (PESA, self-manufactured) to inorganic scale was evaluated by scale static beaker test to CaC03 and Ca3(P04)2, stability test to zinc salt, and dispersion test to ferric oxide. The experimental results demonstrated that PESA functioned excellent scale inhibition to CaC03 and Ca3(P04)2, good stability to zinc salt and special dispersion to ferric oxide. Under the water with hardness 500-1200 mg/L, alkalinity 1000 mg/L, and dosage of PESA 31.2 mg/L, PESA scale inhibition ratio reached more than 85.0%. At dosage of PESA 20.8 mg/L inhibition ratio on calcium phosphate reached 38.9%, at optimum dosage of PESA 9.1 mg/L, the stability ratio was up to 96.1%; while at dosage of PESA 3.6 mg/L, transmittance ratio reached 64.4%. Therefore, PESA can be considered a soluble, high effective and versatile inhibitor. 相似文献
208.
南京北郊秋冬季相对湿度及气溶胶理化特性对大气能见度的影响 总被引:8,自引:4,他引:4
为了解南京北郊秋冬季相对湿度与气溶胶理化特性对大气能见度的影响,利用2012年秋冬季气象要素资料、颗粒物浓度及其主要成分和气溶胶粒子谱分布等观测数据,分析了南京北郊大气能见度与气象要素、颗粒物污染之间的关系.结果表明,南京北郊秋冬季节平均大气能见度仅为4.76 km.颗粒物浓度与能见度存在一定的负相关关系,尤其细粒子对能见度的影响更为显著.随细粒子质量浓度和相对湿度(RH)的增大,低能见度出现的频率呈现上升趋势.能见度从5~10 km衰减到5km时,PM10和PM2.1质量浓度分别增加了7.56%和37.64%;其中SO2-4和NO-3质量浓度均有显著增加.气溶胶粒子数浓度对能见度的影响与相对湿度有关,粒径0.5~2μm的气溶胶数浓度随RH增加增长缓慢,而2~10μm范围内的粒子数浓度随RH增加而减小;结合气溶胶表面积浓度与能见度进行相关性分析,表明0.5~2μm的细粒子及相对湿度是导致南京北郊秋冬季大气能见度下降的主要因素. 相似文献
209.
Xia Chengcheng Liu Guodong Zhou Jing Meng Yuchuan Chen Ke Gu Pengfei Yang Mengxi Huang Xiaohua Mei Jie 《Environmental science and pollution research international》2021,28(30):40160-40177
Environmental Science and Pollution Research - In recent years, the development and utilization of water resources have imposed great impacts on hydrological characteristics and ecological... 相似文献
210.
Dixit Rewati Gupta Anirudh Jordan Norbert Zhou Shengqiang Schild Dieter Weiss Stephan Guillon Emmanuel Jain Rohan Lens Piet 《Environmental science and pollution research international》2021,28(30):40264-40274
Environmental Science and Pollution Research - Bioreduction of selenium oxyanions to elemental selenium is ubiquitous; elucidating the properties of this biogenic elemental selenium (BioSe) is thus... 相似文献