全文获取类型
收费全文 | 3218篇 |
免费 | 396篇 |
国内免费 | 1209篇 |
专业分类
安全科学 | 339篇 |
废物处理 | 147篇 |
环保管理 | 306篇 |
综合类 | 2145篇 |
基础理论 | 500篇 |
环境理论 | 2篇 |
污染及防治 | 767篇 |
评价与监测 | 223篇 |
社会与环境 | 222篇 |
灾害及防治 | 172篇 |
出版年
2024年 | 14篇 |
2023年 | 94篇 |
2022年 | 207篇 |
2021年 | 224篇 |
2020年 | 222篇 |
2019年 | 142篇 |
2018年 | 171篇 |
2017年 | 206篇 |
2016年 | 172篇 |
2015年 | 213篇 |
2014年 | 277篇 |
2013年 | 314篇 |
2012年 | 286篇 |
2011年 | 265篇 |
2010年 | 219篇 |
2009年 | 211篇 |
2008年 | 232篇 |
2007年 | 206篇 |
2006年 | 168篇 |
2005年 | 138篇 |
2004年 | 130篇 |
2003年 | 124篇 |
2002年 | 109篇 |
2001年 | 71篇 |
2000年 | 101篇 |
1999年 | 69篇 |
1998年 | 42篇 |
1997年 | 41篇 |
1996年 | 32篇 |
1995年 | 28篇 |
1994年 | 15篇 |
1993年 | 16篇 |
1992年 | 28篇 |
1991年 | 8篇 |
1990年 | 11篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有4823条查询结果,搜索用时 390 毫秒
101.
102.
103.
104.
The use of Normalized difference vegetation index (NDVI) data acquired with multiple satellite sensors has become a necessity in research fields such as agriculture, Land-Use and Land-Cover Change (LUCC) and changes in the natural environment. In this paper, vegetation 10-day composite (VGT-S10) NDVI data with a 1 km×1 km resolution, covering the period from April 1982 to December 2011 and Advanced Very High Resolution Radiometer (AVHRR) Global Inventory Modelling and Mapping Studies (GIMMS) NDVI data with a 8 km×8 km resolution, covering the period from April 1998 to December 2006 were used. The VGT NDVI covering the period from 2007 to 2011 was converted to the GIMMS NDVI for the same period. The vegetation trend during 1982 to 2011 was calculated using the extended NDVI data set.
Climate change has a large impact on the vegetation dynamics. A series of statistical analyses were employed to demonstrate the relationship between NDVI and meteorological data during 1982 to 2005. A multiple correlation analysis was applied to validate the association between the two climatic factors and monthly maximum NDVI (MNDVI). The partial correlation coefficient of MNDVI and each climate factor were calculated respectively to describe the singular influence of each meteorological variable. The results indicated that temperature made a significant positive influence on vegetation growth in the whole Loess Plateau. Precipitation is the most important climatic factor that closely correlates with MNDVI, particularly in arid and semi-arid environments. However, in some wet regions, precipitation is not a limiting factor on vegetation growth. 相似文献
105.
106.
介绍了个体接触浓度采样法和环境浓度采样法,总粉尘浓度采样法和呼吸性粉尘浓度采样法,最高容许浓度(MAC)采样法与时间加权平均容许浓度(PC-TWA)采样法的结果比较与相互转换,对已有的研究结果做了概述. 相似文献
107.
108.
研究了将青鳉鱼长期暴露于不同浓度的全氟羧酸类物质全氟十三酸(PFTriDA)后的器官分布和富集系数.结果显示, PFTriDA最高富集在性腺;其次是卵、肝脏;浓度最低的部分是残体.除了性腺之外,该器官分布与野生中华鲟的一致.在相同暴露浓度下,雄鱼体内各器官的PFTriDA的含量高于雌鱼,机理模型计算进一步表明高母子传递系数是造成雌雄差异的可能原因.随着PFTriDA暴露浓度的升高,鱼体内同一器官的生物富集系数(BCF)呈现下降趋势. 相似文献
109.
This paper attempts to provide a review of the current state of the art of how e-business/ICT affects the environment. The work reviewed is in various forms including journal papers and thesis which have been peer-reviewed, as well as other resources such as projects and project reports, conference and symposia, and websites. It is claimed that the research examined has captured the most important work to date, either for a general knowledge of this new area or for background study by experts carrying out future research. The review has found that the currently dominant approach is either a micro-level case study approach or a macro-level statistical approach. It is concluded that a more predictive and empirical model, which can be applied within a sector of society, should be more beneficial in the long term. This approach should help simulate potential impacts resulting from changes of indicators, so that positive effects can be promoted and negative ones alleviated proactively, rather than knowing and accepting outcomes passively. 相似文献
110.
目的设计一款适用于现代无线通信系统小型的滤波器天线。方法由一微带开口环谐振器、一段耦合线和一个Г型天线组成一款滤波器天线。这个Г型天线由耦合线激励,在设计中起着导纳变换器的作用。Г型天线不仅起着辐射的作用,同时也是滤波器最后一个谐振器,使滤波器和天线之间基本没有损耗,在仿真调试后,加工成实物进行测试。结果该滤波器天线在反射系数S11<-10 dB的阻抗带宽有12.7%(2.36~2.68 GHz),滤波器天线具有平坦的通带,通带内的最大差异为0.84 dB。滤波器天线通带外增益不到-15 dBi,这说明滤波器天线具有很好的带外抑制性。结论设计的滤波器天线通带内天线增益较为平坦,且拥有良好的带外抑制特性、滤波与辐射特性,并且损耗很低,很适合用于现代无线通信系统的射频前端。 相似文献