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   440篇
  免费   13篇
  国内免费   5篇
安全科学   13篇
废物处理   20篇
环保管理   170篇
综合类   27篇
基础理论   108篇
环境理论   1篇
污染及防治   76篇
评价与监测   28篇
社会与环境   12篇
灾害及防治   3篇
  2023年   2篇
  2022年   1篇
  2021年   2篇
  2020年   5篇
  2019年   2篇
  2018年   12篇
  2017年   8篇
  2016年   12篇
  2015年   11篇
  2014年   9篇
  2013年   24篇
  2012年   12篇
  2011年   27篇
  2010年   10篇
  2009年   21篇
  2008年   25篇
  2007年   19篇
  2006年   32篇
  2005年   19篇
  2004年   22篇
  2003年   15篇
  2002年   19篇
  2001年   10篇
  2000年   12篇
  1999年   5篇
  1998年   7篇
  1997年   10篇
  1996年   4篇
  1995年   4篇
  1994年   12篇
  1993年   5篇
  1992年   7篇
  1991年   4篇
  1990年   8篇
  1989年   7篇
  1988年   7篇
  1987年   2篇
  1986年   2篇
  1985年   6篇
  1984年   6篇
  1983年   5篇
  1982年   5篇
  1981年   1篇
  1979年   6篇
  1978年   6篇
  1977年   4篇
  1976年   2篇
  1973年   1篇
  1971年   1篇
排序方式: 共有458条查询结果,搜索用时 15 毫秒
51.
"二噁英"是指具有相似化学结构和生物特征的一族化合物,分别属于三大类别:多氯代二苯并二噁英(PC-DDs),多氯代二苯并呋喃(PCDFs)以及多氯联苯(PCBs).PCDDs和PCDFs无商业目的性生产,而是在大量的人类活动中产生的.自然过程也可以产生PCDDs和PCDFs.在过去的十年里,环境立法机构和企业一起致力于减少二噁英的排放.  相似文献   
52.
53.
We present conceptual and quantitative models that predict changes in fertilizer‐derived nitrogen delivery from rowcrop landscapes caused by agricultural conservation efforts implemented to reduce nutrient inputs and transport and increase nutrient retention in the landscape. To evaluate the relative importance of changes in the sources, transport, and sinks of fertilizer‐derived nitrogen across a region, we use the spatially explicit SPAtially Referenced Regression On Watershed attributes watershed model to map the distribution, at the small watershed scale within the Upper Mississippi‐Ohio River Basin (UMORB), of: (1) fertilizer inputs; (2) nutrient attenuation during delivery of those inputs to the UMORB outlet; and (3) nitrogen export from the UMORB outlet. Comparing these spatial distributions suggests that the amount of fertilizer input and degree of nutrient attenuation are both important in determining the extent of nitrogen export. From a management perspective, this means that agricultural conservation efforts to reduce nitrogen export would benefit by: (1) expanding their focus to include activities that restore and enhance nutrient processing in these highly altered landscapes; and (2) targeting specific types of best management practices to watersheds where they will be most valuable. Doing so successfully may result in a shift in current approaches to conservation planning, outreach, and funding.  相似文献   
54.
55.
The investigation is concerned with the reported incidence and frequency of homesickness following an environmental transition to university in a group of 101 first year university students. Definitions provided by students indicated that homesickness is a collective term for a number of cognitive and emotional/motivational experiences primarily associated with missing home and wanting to visit it. 60% reported homesickness. Geographical distance of the move and relative lack of satisfaction with features of the psychosocial and physical environment in the new place were found to be associated with homesickness reporting. Personality and circumstantial factors such as decisional control over the move and cognitive failure levels were also associated with homesickness reporting. A two-stage risk model is proposed in which an environmental relocation is a necessary but not a sufficient condition for homesickness; features of the new place combine with personality factors to precipitate the experience.  相似文献   
56.
Although many researchers have examined the impact of organizational tenure on newcomer socialization dynamics, few have explored whether relative tenure influences perceptions and behaviors inside organizations. This study introduces the concept of relative tenure and shows through a sociometric survey of 200 employees across four organizations that an individual's relative position in his or her firm's tenure distribution explains a significantly greater percentage of variance in newcomer status, social network position, and information‐providing behavior than does absolute measures of tenure. The results suggest that organizational growth and turnover may have a bigger impact on newcomer socialization dynamics than has been discussed in the literature. The implications of the findings for socialization researchers and managers are discussed. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   
57.
58.
In situ treatability studies are being conducted to evaluate various in situ technologies to manage groundwater contamination at the NASA Marshall Space Flight Center in Huntsville, Alabama. The focus of these studies is to evaluate remediation options for contaminated (mostly aerobic) groundwater occurring within the basal portion of a clayey residuum called the rubble zone. The tension‐saturated media and unsaturated media lying above the rubble zone are also being treated where they make up a significant component of the contaminant mass. An in situ chemical reduction field pilot test was implemented (following bench‐scale tests) during July and August 2000. The test involved the injection of zero‐valent iron powder in slurry form, using the FeroxSM process patented by ARS Technologies, Inc. The pilot test focused on trichloroethene (TCE)‐contaminated groundwater within the rubble zone. Maximum pre‐injection concentrations of about 72,800 micrograms per liter (μg/l) were observed and no secondary sources are believed to exist beneath the area. The potential presence of unexploded ordnance forced an implementation strategy where source area injections were completed, as feasible, followed by overlapping injections in a down gradient alignment to create a permeable reactive zone for groundwater migration. Eight post‐injection rounds of groundwater performance monitoring were completed. The results are encouraging, in terms of predicted responses and decreasing trends in contaminant levels. © 2003 Wiley Periodicals, Inc.  相似文献   
59.
60.
The investigation concerns the impact of the new school environment on a group of 50 male and female children aged 11–16 years, who leave home to reside temporarily at boarding school, in terms of the characteristics of problems and worries reported and the incidence of spontaneous reports of homesickness. More problems relating to the school than to the home environment were reported but proportionally more worry units were reported associated with home problems for both males and females. There was no sex differences in this respect. The reported level of spontaneously reported homesickness was 16% and there were no sex differences. Factors such as age, geographical distance of move and decision to go away to school were not influential in determining the level of reported problems or incidence of spontaneous reports of homesickness. A relationship was found with level of problems reported and recent life history but the result proved difficult to interpret.  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