全文获取类型
收费全文 | 2648篇 |
免费 | 92篇 |
国内免费 | 762篇 |
专业分类
安全科学 | 153篇 |
废物处理 | 169篇 |
环保管理 | 204篇 |
综合类 | 1217篇 |
基础理论 | 464篇 |
环境理论 | 1篇 |
污染及防治 | 997篇 |
评价与监测 | 115篇 |
社会与环境 | 61篇 |
灾害及防治 | 121篇 |
出版年
2023年 | 34篇 |
2022年 | 109篇 |
2021年 | 106篇 |
2020年 | 64篇 |
2019年 | 71篇 |
2018年 | 79篇 |
2017年 | 117篇 |
2016年 | 135篇 |
2015年 | 132篇 |
2014年 | 212篇 |
2013年 | 267篇 |
2012年 | 241篇 |
2011年 | 247篇 |
2010年 | 183篇 |
2009年 | 174篇 |
2008年 | 172篇 |
2007年 | 149篇 |
2006年 | 157篇 |
2005年 | 107篇 |
2004年 | 71篇 |
2003年 | 88篇 |
2002年 | 77篇 |
2001年 | 60篇 |
2000年 | 56篇 |
1999年 | 67篇 |
1998年 | 51篇 |
1997年 | 58篇 |
1996年 | 34篇 |
1995年 | 37篇 |
1994年 | 29篇 |
1993年 | 22篇 |
1992年 | 26篇 |
1991年 | 13篇 |
1990年 | 19篇 |
1989年 | 15篇 |
1988年 | 6篇 |
1987年 | 5篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1958年 | 2篇 |
排序方式: 共有3502条查询结果,搜索用时 15 毫秒
991.
992.
分析了油品长输管道泄漏的3种主要原因:外力破坏、管道腐蚀穿孔和管道本体缺陷,并根据这3种主要原因提出了具有针对性的防范措施,通过这些措施的实施可以有效地降低管道的泄漏风险. 相似文献
993.
采集呼和浩特市武川县三个村庄15个土壤样品,并对5种重金属进行分析,结果显示:三个村15个点位土壤单项污染指数均小于1,土壤污染程度均属无污染,土壤环境质量分级为Ⅰ级。 相似文献
994.
根据加油站实际工况,模拟埋地油罐人孔井内发生汽油泄漏时,挥发的油气在人孔井内积聚并遇到点火源发生爆炸的事故.埋地油罐内布置压力传感器,实验人孔井内布置压力传感器,人孔井周围布置热流传感器,以获得事故对埋地油罐、人孔井口人员及设备的影响数据.实验结果表明:爆炸在人孔井内产生的压力冲击波和热辐射冲击,会对人孔井口的人员造成严重伤害,但对埋地油罐罐内不会造成影响.油气闪爆后,人孔井盖可能处于关闭或打开两种状态,使得人孔井内火焰熄灭或形成稳定燃烧,燃烧限制于人孔井,对埋地油罐和周围设施影响较小. 相似文献
995.
Measurements of surface O3 and carbon monoxide(CO) were made from September 2009 to August 2011 at Dangxiong(30.48°N, 91.10°E, 4187 m a.s.l.), a remote highland site in a southern valley of the Nyainqêntanglha Mountains in the Tibetan Plateau, China. The monthly mean O3 mixing ratio ranged from 29.1 to 51.4 ppb, with an average of 38.5 ppb, and the maximum value was observed in May. The average diurnal cycle of O3 concentration showed a minimum in early morning and a maximum in the afternoon, with a broader "high platform" from the late morning to the late afternoon, and resembled that of surface wind speed. The concentration of surface O3 was highly significantly correlated with tropospheric column O3 over the regions surrounding Dangxiong and with that of surface O3 observed at a site north of the Nyainqêntanglha Mountains, suggesting a good regional representativeness of surface O3 at Dangxiong. In the afternoon when stronger winds blew, surface air showed distinct features of free-atmospheric air, with higher O3, lower CO, and lower relative humidity(RH). The negative O3–CO and O3–RH correlations in most months indicate a significant influence of air masses from the free troposphere. Trajectory analysis suggests that air masses originating from the south of the site make a negative net contribution to surface O3 and a positive contribution to CO and humidity, and those from the northwest sector contribute conversely to the respective quantities. 相似文献
996.
NOx emissions from biogenic sources in soils play a significant role in the gaseous loss of soil nitrogen and consequent changes in tropospheric chemistry. In order to investigate the characteristics of NOx fluxes and factors influencing these fluxes in degraded sandy grasslands in northern China, diurnal and spatial variations of NOx fluxes were measured in situ. A dynamic flux chamber method was used at eight sites with various vegetation coverages and soil types in the northern steppe of China in the summer season of 2010. Fluxes of NOx from soils with plant covers were generally higher than those in the corresponding bare vegetation-free soils, indicating that the canopy plays an important role in the exchange of NOx between soil and air. The fluxes of NOx increased in the daytime, and decreased during the nighttime, with peak emissions occurring between 12:00 and 14:00. The results of multiple linear regression analysis indicated that the diurnal variation of NOx fluxes was positively correlated with soil temperature (P < 0.05) and negatively with soil moisture content (P < 0.05). Based on measurement over a season, the overall variation in NOx flux was lower than that of soil nitrogen contents, suggesting that the gaseous loss of N from the grasslands of northern China was not a significant contributor to the high C/N in the northern steppe of China. The concentration of NOx emitted from soils in the region did not exceed the 1-hr National Ambient Air Quality Standard (0.25 mg/m3). 相似文献
997.
998.
999.
系统分析了PX项目的环境风险,结果表明:PX项目装置各单元均不是危险化工工艺单元,安全设施和污染治理水平相较于其它石油化工装置更高,但是基于装置物料的危险性和生产企业的高环境敏感度,PX项目的环境保护工作面临较大挑战。在此基础上,剖析了目前国内PX项目存在的主要环境风险问题,并提出相应的对策建议。 相似文献
1000.