首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   20887篇
  免费   195篇
  国内免费   160篇
安全科学   560篇
废物处理   872篇
环保管理   2644篇
综合类   3262篇
基础理论   5611篇
环境理论   5篇
污染及防治   5381篇
评价与监测   1338篇
社会与环境   1444篇
灾害及防治   125篇
  2022年   180篇
  2021年   181篇
  2020年   130篇
  2019年   182篇
  2018年   286篇
  2017年   293篇
  2016年   451篇
  2015年   301篇
  2014年   478篇
  2013年   1608篇
  2012年   569篇
  2011年   841篇
  2010年   710篇
  2009年   696篇
  2008年   900篇
  2007年   895篇
  2006年   860篇
  2005年   685篇
  2004年   733篇
  2003年   698篇
  2002年   622篇
  2001年   905篇
  2000年   604篇
  1999年   366篇
  1998年   275篇
  1997年   266篇
  1996年   272篇
  1995年   297篇
  1994年   325篇
  1993年   266篇
  1992年   293篇
  1991年   266篇
  1990年   308篇
  1989年   284篇
  1988年   244篇
  1987年   214篇
  1986年   207篇
  1985年   204篇
  1984年   227篇
  1983年   218篇
  1982年   226篇
  1981年   200篇
  1980年   158篇
  1979年   176篇
  1978年   155篇
  1977年   144篇
  1975年   133篇
  1974年   143篇
  1973年   137篇
  1972年   155篇
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
721.
A growing literature has suggested that high performance goals can have unintended consequences within organizations as employees engage in unethical behavior to achieve outcomes associated with goal attainment. Extending research on the dark side of goal setting, we suggest that high performance goals not only create a desire to achieve a particular outcome but also alter moral reasoning processes related to goal attainment. Integrating goal-setting theory with motivated moral reasoning, we hypothesize an indirect effect of high performance goals on unethical behavior via state moral disengagement. We also examine goal commitment—which tends to amplify the relationship between high goals and performance—as a key boundary condition associated with this indirect effect. We build this conditional indirect effect model across three studies conducted in the field and the laboratory. Our results provide new insight into both when and why high goals can facilitate moral disengagement and unethical behavior within organizations.  相似文献   
722.
This research seeks for improved understanding regarding the interaction of meaningful work and the work–family interface. Existing literature suggests that experiencing a sense of calling toward work makes the work domain particularly salient to employees compared to other life domains. In this article, we draw on this idea, rooted in identity theory, to hypothesize that a sense of calling toward work diminishes the effects of work–family conflict and work–family enrichment on employee's job and life satisfaction. We test these ideas in two studies. First, we surveyed an alumni sample of 598 employees from various jobs, industries, and job levels. Then, in a constructive replication, we surveyed 327 employees using a time-lagged design. Calling was found to significantly buffer the effect of work–family conflict on job satisfaction in Study 2, but not Study 1. Calling did not buffer the effect of conflict on life satisfaction in either study. However, both studies demonstrated that calling attenuated (substituted for) the effect of work–family enrichment on job satisfaction. Study 1 supported the idea that calling attenuates the effect of enrichment on life satisfaction; however, this interactive effect was reversed in Study 2, contrary to expectations. We discuss implications for theory and practice related to callings and career choices, as well as for the role of calling and work identity in the work–family interface.  相似文献   
723.
Behavioral Ecology and Sociobiology - In the animal kingdom, conspicuous colors are often used for inter- and intra-sexual communication. Even though primates are the most colorful mammalian taxon,...  相似文献   
724.
Maintaining a living plant collection is the most common method of ex situ conservation for plant species that cannot be seed banked (i.e., exceptional species). Viability of living collections, and their value for future conservation efforts, can be limited without coordinated efforts to track and manage individuals across institutions. Using a pedigree-focused approach, the zoological community has established an inter-institutional infrastructure to support long-term viability of captive animal populations. We assessed the ability of this coordinated metacollection infrastructure to support the conservation of 4 plant species curated in living collections at multiple botanic gardens around the world. Limitations in current practices include the inability to compile, share, and analyze plant collections data at the individual level, as well as difficulty in tracking original provenance of ex situ material. The coordinated metacollection framework used by zoos can be adopted by the botanical community to improve conservation outcomes by minimizing the loss of genetic diversity in collections. We suggest actions to improve ex situ conservation of exceptional plant species, including developing a central database to aggregate data and track unique individuals of priority threatened species among institutions and adapting a pedigree-based population management tool that incorporates life-history aspects unique to plants. If approached collaboratively across regional, national, and global scales, these actions could transform ex situ conservation of threatened plant species.  相似文献   
725.
Ambio - Muskoxen (Ovibos moschatus) are an integral component of Arctic biodiversity. Given low genetic diversity, their ability to respond to future and rapid Arctic change is unknown, although...  相似文献   
726.
Environmental Economics and Policy Studies - U.S. output has steadily outpaced the rise in greenhouse gas (GHG) emissions over the past several decades. The decoupling of these two trends...  相似文献   
727.
Environmental Science and Pollution Research - Acrylamide (AA), an industrial monomer, may cause multi-organ toxicity through induction of oxidative stress and inflammation. The antioxidant...  相似文献   
728.
Environmental Science and Pollution Research - This study investigates the kinked exponential growth, degree of association, and causation between economic growth, energy consumption, population,...  相似文献   
729.
超高效液相色谱法测定土壤中微量阿特拉津   总被引:1,自引:0,他引:1  
采用超高效液相色谱仪,建立了土壤中微量阿特拉津的快速检测方法.研究结果表明:采用反相C18色谱柱,以甲醇/水(70:30,v/v)为流动相,流速为0.2 ml/min,柱温为30℃,检测波长为220 nm条件下,在12.5~1000μg/L质量浓度范围内线性关系良好(r=0.9999),检出限0.18×10-3 mg/...  相似文献   
730.
Point Sampling Digital Imagery with ‘Samplepoint’   总被引:1,自引:0,他引:1  
Measuring percent occurrence of objects from digital images can save time and expense relative to conventional field measurements. However, the accuracy of image analysis had, until now, not reached the level of the best conventional field measurements. Additionally, most image-analysis software programs require advanced user training to successfully analyze images. Here we present a new software program, ‘SamplePoint,’ that provides the user a single-pixel sample point and the ability to view and identify the pixel context. We found SamplePoint to allow accuracy comparable with the most accurate field-methods for ground-cover measurements. Expert use of the program requires minimal training and its ease of use allows rapid measurements from image data. We recommend SamplePoint for calibrating the threshold-detection level of image-analysis software or for making direct measurements of percent occurrence from digital images.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号