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   18126篇
  免费   332篇
  国内免费   459篇
安全科学   650篇
废物处理   774篇
环保管理   2648篇
综合类   3208篇
基础理论   4648篇
环境理论   7篇
污染及防治   4737篇
评价与监测   1034篇
社会与环境   1064篇
灾害及防治   147篇
  2023年   96篇
  2022年   212篇
  2021年   192篇
  2020年   225篇
  2019年   177篇
  2018年   309篇
  2017年   291篇
  2016年   452篇
  2015年   353篇
  2014年   504篇
  2013年   1461篇
  2012年   651篇
  2011年   940篇
  2010年   703篇
  2009年   801篇
  2008年   862篇
  2007年   897篇
  2006年   740篇
  2005年   631篇
  2004年   636篇
  2003年   576篇
  2002年   554篇
  2001年   656篇
  2000年   534篇
  1999年   321篇
  1998年   213篇
  1997年   229篇
  1996年   225篇
  1995年   271篇
  1994年   213篇
  1993年   214篇
  1992年   176篇
  1991年   185篇
  1990年   184篇
  1989年   184篇
  1988年   157篇
  1987年   133篇
  1986年   158篇
  1985年   144篇
  1984年   191篇
  1983年   149篇
  1982年   171篇
  1981年   158篇
  1980年   131篇
  1979年   149篇
  1978年   96篇
  1977年   98篇
  1974年   95篇
  1973年   89篇
  1972年   96篇
排序方式: 共有10000条查询结果,搜索用时 281 毫秒
351.
352.
353.
Beinin L 《Disasters》1981,5(2):142-146
Thus the hazards to health observed from these two earthquakes can be summarised as follows: (a) massive immediate damage, the main victims being women and children; (b) the seriously injured suffer mainly from fractures (17%), head injuries (15-30%) and soft tissue conusions with haemhorrage; (c) a change in the physical features of a country which unfavourably affect the environment; (d) some time after the earthquake the appearance of communicable disease; (e) increases in cases of cardiovascular disease neuroses and psychoses.  相似文献   
354.
The conscientious and planned integration of frontier areas into the national economy can at least partially alleviate both environmental and economic problems that are common to many developing countries. Full development of the agricultural potential of frontier areas can lessen the environmental deterioration often found in traditionally settled regions. Exploitation of mineral resources, in particular energy resources, can lessen economic burdens associated with increased costs of imported energy. The authors examine how recent international developments have spurred the government of Guatemala to undertake measures designed to develop a previously underutilized region. The short term negative consequences of increased costs for imported grains and petroleum may well have a positive result in the long term insofar as they lead to more balanced and rational use of land and resources.  相似文献   
355.
Involuntary eye movements in salamanders   总被引:1,自引:0,他引:1  
  相似文献   
356.
Snarr DN  Brown EL 《Disasters》1979,3(3):287-292
To some degree it is unfair to evaluate a post-disaster housing program as to its effectiveness in decreasing vulnerability and preventing future disasters. As Burton states, "With rare exceptions, administrators and techniques have been trained to cope with disaster rather than to prevent it" [reference (2), p.197]. These were certainly not goals articulated by the agency responsible for constructing housing after Fifi. However, the authors feel that failure to evaluate specific projects by persons knowledgeable of the projects functioning, will only forestall the shift which Cuny calls for, "… from disaster response to disaster mitigation and prevention" [reference (4), p.123). In doing this we hope to add some specific case study data to the growing literature on disaster mitigation and prevention. Disaster vulnerability in Honduras is overwhelmingly related to flooding. More crucial than the materials and construction of housing is the issue of siting. If appropriately sited, houses made of bajarique, wood, or concrete block are able to withstand the heavy rains associated with a hurricane. Regarding the siting of the projects, the Honduras Project clearly has one positive and one negative accomplishment in the cases of Santa Rica and Flores, respectively. San Jose is less clear but is certainly a much safer site than those formerly occupied by the residents, in that there is no danger of flooding. The present site was not flooded during Fifi nor did it experience mudslides. However, the future is not so clear regarding the latter. Within the village proper a large amount of vegetation has been added which will tend to stabilise the soil on the steeper slopes. The streets, however, are seriously eroded and probably can not be maintained for vehicle usage, which does not pose a serious problem to the residents as none possess automobiles or trucks. One large gully bisects the village and receives run-off from the adjacent hills. It has been expanding, which would suggest that the slopes above the village could prove problematic in case of a Fifi-sized storm. Flores is located on a very poor site in reference to prevention and mitigation. It is located in a portion of the Sula Valley which is prone to flooding and, as mentioned before, was inundated by over 2m of water during hurricane Fifi. No prevention techniques were possible by NAEA/HEA and the houses were built on earthen mounds barely adequate to keep water out during the rainy season. The nearby dike which could possibly provide protection is non-functional due to poor maintainance. Given a storm of Fifi's magnitude, or possibly smaller, this site will again be flooded. Santa Rica is clearly well sited concerning flooding: it did not experience flooding during Fifi and is not flood prone. However, houses did experience some wall damage due to earthquakes following and associated with the Guatemalan quake of 1976. Due to the size and nature of the latter much "re-adjustment" occurred in the neighbouring fault system; however, damage to the houses was all superficial. We feel the residents were vocal about their concern due to the severity of the Guatemalan disaster and their lack of experience with concrete block houses. That the two sites (particularly Flores and partially San Jose) are vulnerable to future disasters cannot be considered solely the fault of an outside agency without local knowledge and understanding. In the engineering report issued during the construction it was explicitly stated that in Flores, "Future flooding remains a danger," [reference (6), p.49]. The future residents of Flores had gained access to the land from the National Agrarian Institute and were anxious to receive assistance in building homes. In fact, CARE, which had previously given these people tin roofing for houses, was threatening to take it back since the people had not yet started building. NAEA/HEA were responding to people in a rather desperate situation. But, on the other hand, they were responding to people who had been promised (not given) land by an agency of the Honduran national government which would be cognizant of the potential flooding at this site. Likewise, in San Jose, where mudslides and erosion remain a threat, the land was provided by a local government agency, the municipality. Although our goal in this discussion has not been to establish blame, we feel it imperative to mention the sequence of events that resulted in the questionable siting of Flores and San Jose. It is very easy and often accurate to place blame on outsiders who lack sophistication and knowledge about such matters. In this case local input did not result in post-disaster planning that is actually precautionary. This, we feel, illustrates the extreme complexity of cross-cultural aid, especially in the post-disaster period. It also points to the need for precautionary planning with reference to permanent post-disaster reconstruction.  相似文献   
357.
358.
359.
360.
This study quantifies the short-run impacts of reclamation on strip mining costs, coal prices, production, and employment in Appalachia. A process analysis model is developed and used to estimate short-run strip-mined coal supply functions under conditions of alternative reclamation requirements. Then, an econometric model is developed and used to estimate coal demand relations. Our results show that full reclamation has rather minor impacts. In 1972, full reclamation would have increased strip-mined coal production costs an average of $0.35 per ton, reduced strip-mined coal production by 10 million tons, and cost approximately 1600 jobs in Appalachia.  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