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   3695篇
  免费   130篇
  国内免费   758篇
安全科学   183篇
废物处理   204篇
环保管理   272篇
综合类   1743篇
基础理论   702篇
污染及防治   1058篇
评价与监测   212篇
社会与环境   137篇
灾害及防治   72篇
  2023年   38篇
  2022年   141篇
  2021年   151篇
  2020年   83篇
  2019年   65篇
  2018年   97篇
  2017年   140篇
  2016年   121篇
  2015年   148篇
  2014年   200篇
  2013年   312篇
  2012年   217篇
  2011年   231篇
  2010年   183篇
  2009年   183篇
  2008年   227篇
  2007年   170篇
  2006年   188篇
  2005年   139篇
  2004年   100篇
  2003年   82篇
  2002年   91篇
  2001年   96篇
  2000年   103篇
  1999年   86篇
  1998年   69篇
  1997年   70篇
  1996年   63篇
  1995年   52篇
  1994年   46篇
  1993年   37篇
  1992年   27篇
  1991年   43篇
  1990年   54篇
  1989年   25篇
  1988年   30篇
  1987年   21篇
  1985年   22篇
  1984年   23篇
  1983年   18篇
  1982年   32篇
  1979年   18篇
  1977年   15篇
  1974年   17篇
  1972年   18篇
  1967年   23篇
  1966年   19篇
  1965年   13篇
  1962年   13篇
  1958年   14篇
排序方式: 共有4583条查询结果,搜索用时 15 毫秒
121.
The toxicity of ammonia to Hyalella azteca at constant pH in artificial media was controlled by sodium and potassium, and not by calcium, magnesium, or anions. Small increases in the LC50 for total ammonia (from 0.15 to 0.5 mM) occurred as sodium was increased from 0.1 to 1 mM and above, but major increases in the LC50 (to over 10 mM total ammonia) required the addition of potassium. Potassium was, however, more effective at reducing ammonia toxicity at high (1 mM) sodium than at low (0.1 mM) sodium. Ammonia toxicity was independent of pH at low sodium and potassium concentrations, when ammonia toxicity appeared to be associated primarily with aqueous ammonium ion concentrations. At high sodium and potassium concentrations, the toxicity of ammonia was reduced to the point where un-ionized ammonia concentrations also affected toxicity, and the LC50 became pH dependent. A mathematical model was produced for predicting ammonia toxicity from sodium and potassium concentrations and pH.  相似文献   
122.
Evacuation mapping: the utility of guidelines   总被引:2,自引:0,他引:2  
Dymon UJ  Winter NL 《Disasters》1993,17(1):12-24
  相似文献   
123.
Bollag U 《Disasters》1979,3(4):413-415
An epidemic outbreak of typhoid fever in the largest refugee camp of the besieged capital of Phom-Penh, Cambodia; the concomitant lack of personal and public hygiene and the availability of a locally manufactured Tetanus-Typhoid-Paratyphoid vaccine, prompted us to test the practicability of a mass immunization campaign by carrying out a trial in the smaller, well delineated refugee camp of Pochentong. Attendances by adults as well as children throughout the three or four inoculation rounds showed a steady decline with only 30 (20%) of the people completing the course. The general initial acceptance by the people on the other hand was good, due to a comprehensive service (information, health education and individual care of patients). It is concluded from these results that multi-injection immunization campaigns against typhoid-paratyphoid are a waste of money in a war-torn situation with an unstable population.  相似文献   
124.
生物技术在油气田环境污染治理中的应用   总被引:1,自引:0,他引:1  
介绍了生物技术及其在环境污染治理中的应用状况,根据我国油气田环境污染治理现状,提出了生物技术在我国油气田环境污染治理中重点研究的方向和步骤以及应用前景。  相似文献   
125.
The use of pressure-volume-temperature (PVT) studies in processing of a biodegradable plastic composition made from soy protein isolate and corn starch is described. The ability of PVT measurements to predict the combined effects of pressure, volume, and temperature effects is demonstrated. The results show that the PVT relations of the plastic can be predicted by using a regression analysis similar to the Tait equations of state. A change in slope of the PVT curves was observed at around 80‡C, which is ascribed to the glass-transition process of the plastic. Evidence of onset of thermal degradation of the plastic was observed at ca. 160‡C under 0 to 200 MPa isobaric pressure. This thermal degradation precluded determination of the crystal melting point of the plastic.  相似文献   
126.
笔者综述了三峡库区地质灾害监测技术的应用现状。在论述当前地质灾害监测技术存在的问题的基础上,提出了新型的基于Internet的地质灾害远程、集中监测系统,并详细讨论了该技术的原理、结构、应用前景以及功能完善和发展方向。新型安全监测系统的使用可有效防止库区地质灾害的发生,控制其潜在危害;提高库区整体预警管理水平,有效增强防灾减灾能力;显著降低库区安全监测系统运行成本。  相似文献   
127.
The distribution and impacts of different nitrogen pollutants are inextricably linked. To understand the problem fully, the interactions between the different pollutants need to be taken into account. This is particularly important when it comes to abatement techniques, since measures to reduce emissions of one nitrogen pollutant can often lead to an increase in another. This project represents a step towards greater understanding of these issues by linking together new and existing nitrogen flux models into a larger framework. The modelling framework has been constructed and some of the nitrogen flows between fields, farms and the atmosphere have been modelled for a UK study area for typical farm management scenarios.  相似文献   
128.
稠油污水处理系统改造与絮凝剂筛选试验研究   总被引:2,自引:1,他引:2  
河南油田井楼稠油联合站含油污水中的污油和悬浮物含量较高,超过150mg/L。为此,对该处理系统进行了改造,并对絮凝剂的筛选进行了试验。结果表明:无机絮凝剂与有机絮凝剂联合作用,可对污水中所含有的污油和有机物杂质的悬浮物产生很好的絮凝沉降效果。加药浓度、加药顺序及沉降时间均对絮凝沉降效果有一定的影响。改造后的污水处理系统实现了污水达标回注,降低了无效回注费用。同时还回收了污油,降低了药剂成本,产生了十分明显的经济效益,每年节约成本约500万元。  相似文献   
129.
ABSTRACT: Dynamic linear models (DLM) and seasonal trend decomposition (STL) using local regression, or LOESS, were used to analyze the 50‐year time series of suspended sediment concentrations for the Yadkin River, measured at the U.S. Geological Survey station at Yadkin College, North Carolina. A DLM with constant trend, seasonality, and a log10 streamflow regressor provided the best model to predict monthly mean log10 suspended sediment concentrations, based on the forecast log likelihood. Using DLM, there was evidence (odds approximately 69:1) that the log10 streamflow versus log10 suspended sediment concentration relationship has changed, with an approximate 20 percent increase in the log10 streamflow coefficient over the period 1981 to 1996. However, sediment concentrations in the Yadkin River have decreased during the decade of the 1990s, which has been accompanied by a concomitant increase in streamflow variability. Although STL has been shown to be a versatile trend analysis technique, DLM is shown to be more suitable for discovery and inference of structural changes (trends) in the model coefficient describing the relationship between flow and sediment concentration.  相似文献   
130.
基于可接受安全间距的单车道交通流模拟模型   总被引:1,自引:1,他引:1  
交通流微观模拟是采用计算机对交通流进行描述及分析的方法。尤其对于复杂的交通流而言,微观模拟具有明显的优势,然而模拟的准确与否,关键在于模型的建立。笔者即是在研究我国单车道交通流特点的基础上,借鉴车道变换理论,基于驾驶员可接受的交通安全间距,分析安全变换车道的各间距之间的关系,阐述了有超车的单车道交通流模拟模型的建立方法  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