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   9362篇
  免费   1247篇
  国内免费   5495篇
安全科学   1791篇
废物处理   369篇
环保管理   858篇
综合类   8802篇
基础理论   1889篇
环境理论   2篇
污染及防治   1404篇
评价与监测   434篇
社会与环境   332篇
灾害及防治   223篇
  2024年   53篇
  2023年   405篇
  2022年   567篇
  2021年   639篇
  2020年   630篇
  2019年   644篇
  2018年   519篇
  2017年   473篇
  2016年   554篇
  2015年   651篇
  2014年   556篇
  2013年   1014篇
  2012年   1016篇
  2011年   1090篇
  2010年   709篇
  2009年   846篇
  2008年   704篇
  2007年   828篇
  2006年   808篇
  2005年   595篇
  2004年   505篇
  2003年   409篇
  2002年   307篇
  2001年   267篇
  2000年   243篇
  1999年   186篇
  1998年   143篇
  1997年   134篇
  1996年   105篇
  1995年   108篇
  1994年   72篇
  1993年   73篇
  1992年   46篇
  1991年   18篇
  1990年   24篇
  1989年   19篇
  1988年   15篇
  1987年   5篇
  1986年   12篇
  1985年   4篇
  1984年   8篇
  1983年   11篇
  1982年   13篇
  1981年   10篇
  1980年   7篇
  1979年   4篇
  1978年   5篇
  1973年   6篇
  1972年   5篇
  1971年   33篇
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
991.
ABSTRACT .Operating rule procedures are developed for the optimal use of desalination in conjunction with surface water impoundments. Results obtained from the use of hill-climbing and dynamic programming methods are compared. Benefits to be obtained from the integrated use of desalination are demonstrated through a case study for the Barcelona area of Spain.  相似文献   
992.
ABSTRACT The selection of an evaporator design must reflect the balancing of captial cost (primarily in heat exchanger surface and vessels) against operating cost (primarily steam cost) to achieve minimum cost. In a conjunctive plant the tendency is to select a low-capital cost, high-operating cost plant. In addition, it is advantageous to use a high-capacity plant which needs to be operated much less of the time than a plant which is sized just at the needed rate. For example, in the study of a possible system to satisfy a future increase of 450 MGD in water supply to New York Qty, a plant of 750 MGD capacity was selected as optimum. This plant, of the advanced VTE-MSF process type, would have a performance ratio of 9 lb product/1000 Btu as compared to 10-13 normally used for base-loaded plants. Steam would be supplied by a multi-unit dual-purpose nuclear power plant. The most economical type of energy supply would be “interruptible”; the steam would be used by a low pressure turbine to generate electricity during periods of peak electrical demand but would be available to the desalting plant at other times. The low pressure turbine would be available as spinning reserve during desalting plant operation. It is estimated that the desalting plant would have a load factor of 27 per cent over its life.  相似文献   
993.
ABSTRACT A discussion of the various tools and techniques available for evaluation of aquifers is presented. Data for evaluation studies can be obtained from laboratory experiments, geological maps, well logs and field studies. Such data can be used in analytic or electric analog models to determine the sustained yield of the aquifer under various operating conditions.  相似文献   
994.
ABSTRACT Significant parameters for predicting thunderstorm runoff from small semiarid watersheds are determined using data from the Walnut Gulch watershed in southern Arizona. Based on these data, thunderstorm rainfall is dominant over watershed parameters for predicting runoff from multiple linear regression equations. In some cases antecedent moisture added significantly to the models. A technique is developed for estimating precision of predicted values from multiple linear regression equations. The technique involves matrix methods in estimating the variance of mean predicted values from a regression equation. The estimated variance of the mean predicted value is then used to estimate the variance of an individual predicted value. A computer program is developed to implement these matrix methods and to form confidence limits on predicted values based on both a normality assumption and the Chebyshev inequality.  相似文献   
995.
To aid in planning and design of additional flood protection on the Lower Rio Grande, the Hydroraeteorological Branch prepared a probable maximum precipitation study for the International Boundary and Water Commission (United States and Mexico) and the Republic of Mexico. Five drainages from 2,000 to over 17,000 square miles in area between Falcon and Anzalduas Dams including Rio San Juan and Rio Alamo in Mexico are the areas of concern. The great rains of hurricane Beulah, September 19–24, 1967 verified that additional protection is needed. Procedures for estimating probable maximum precipitation (PMP) are described. A particular problem was to estimate rainfall potential for the Sierra Madre Oriental in Rio San Juan and Alamo drainages. These mountains form a north-south windward-facing slope and barrier of over 7000 feet in elevation. A detailed study was made of rains from hurricane Beulah. The storm produced the greatest known rain depths in North America for 50,000 square miles or greater, and durations longer than 48 hours.  相似文献   
996.
ABSTRACT: Teodoro Ardemans, first post-Renaissance water expert of Spain, recognized problems of ground-water contamination, influence of minerals on water quality, and mutual interference between closely spaced wells. He is also noted for his achievements in architecture and the writing of the first comprehensive building code for Madrid.  相似文献   
997.
用蒽醌生产中的废硫酸制备硫酸钾   总被引:2,自引:0,他引:2  
王娉  程秀莲 《化工环保》1999,19(5):298-302
研究了以蒽醌生产中的废硫酸为原料,通过缔合,置换,解缔等步骤,制备硫酸钾的最佳工艺条件。在最佳条件下,可使废硫酸中H2SO4的质量分数从23%降至0.60%,废硫酸成盐率为89.01%,硫酸钾纯度为95.85%。  相似文献   
998.
李泽琼  谢嘉 《四川环境》1999,18(3):32-36
本文介绍了关于洗涤剂中磷对环境影响的两种典型观点和解决的办法,并从经济和环境的角度进行全面的分析,得出合理的结论和建议。  相似文献   
999.
As one of the biodegradable polymers, the blend of poly(butylene succinate) and poly(butylene terephthalate) is dealt with in this study. In our previous work, it was demonstrated that PBS and PBT are immiscible not only from the changes of T g but also from logG–log G plots. It is expected that the biodegradability of the blends could be improved by enhancing the miscibility. We tried to induce the transesterification reaction between two polyesters with various time intervals to enhance the miscibility of the blends. The extent of transesterification reaction was examined by 1H-NMR. We utilized a dynamic mechanical thermal analyzer and a rotational rheometer to investigate the changes in miscibility. We also verified the biodegradability of PBS/PBT blends after the transesterification reaction by the composting method.  相似文献   
1000.
ABSTRACT

An eQUEST model was developed to conduct a simulation study of a natural gas engine-driven heat pump (GEHP) for an office building in Woodstock, Ontario, Canada. Prior to the installation of the GEHP, the heating and cooling demands of the office building were provided by rooftop units (RTUs), comprising of natural gas heater and electric air conditioner. Energy consumption for both GEHP and RTUs were monitored for operation in alternating months. These recorded energy consumptions along with weather data were used in the regression analysis. The developed eQUEST models were validated and calibrated with the regression analysis results with respect to the ASHRAE Guideline 14–2014. The eventual models were then applied to investigate the potential annual energy consumption, greenhouse gas (GHG) emission and energy cost savings achieved by using the GEHP in Woodstock, and other cities in Canada, particularly in Ontario.  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