全文获取类型
收费全文 | 1183篇 |
免费 | 92篇 |
国内免费 | 93篇 |
专业分类
安全科学 | 222篇 |
废物处理 | 14篇 |
环保管理 | 325篇 |
综合类 | 203篇 |
基础理论 | 397篇 |
环境理论 | 1篇 |
污染及防治 | 80篇 |
评价与监测 | 50篇 |
社会与环境 | 56篇 |
灾害及防治 | 20篇 |
出版年
2023年 | 35篇 |
2022年 | 35篇 |
2021年 | 57篇 |
2020年 | 51篇 |
2019年 | 37篇 |
2018年 | 17篇 |
2017年 | 32篇 |
2016年 | 47篇 |
2015年 | 44篇 |
2014年 | 32篇 |
2013年 | 67篇 |
2012年 | 30篇 |
2011年 | 93篇 |
2010年 | 60篇 |
2009年 | 100篇 |
2008年 | 73篇 |
2007年 | 58篇 |
2006年 | 80篇 |
2005年 | 52篇 |
2004年 | 33篇 |
2003年 | 31篇 |
2002年 | 30篇 |
2001年 | 21篇 |
2000年 | 23篇 |
1999年 | 17篇 |
1998年 | 22篇 |
1997年 | 14篇 |
1996年 | 14篇 |
1995年 | 13篇 |
1994年 | 9篇 |
1993年 | 9篇 |
1991年 | 4篇 |
1990年 | 7篇 |
1989年 | 8篇 |
1988年 | 6篇 |
1987年 | 9篇 |
1986年 | 6篇 |
1985年 | 8篇 |
1984年 | 4篇 |
1983年 | 6篇 |
1981年 | 9篇 |
1980年 | 7篇 |
1979年 | 12篇 |
1978年 | 6篇 |
1977年 | 6篇 |
1975年 | 4篇 |
1973年 | 6篇 |
1972年 | 7篇 |
1971年 | 5篇 |
1970年 | 3篇 |
排序方式: 共有1368条查询结果,搜索用时 15 毫秒
1.
Human factors are the largest contributing factors to unsafe operation of the chemical process systems. Conventional methods of human factor assessment are often static, unable to deal with data and model uncertainty, and to consider independencies among failure modes. To overcome the above limitations, this paper presents a hybrid dynamic human factor model considering Human Factor Analysis and Classification System (HFACS), intuitionistic fuzzy set theory, and Bayesian network. The model is tested on accident scenarios which have occurred in a hot tapping operation of a natural gas pipeline. The results demonstrate that poor occupational safety training, failure to implement risk management principles, and ignoring reporting unsafe conditions were the factors that contributed most failures causing accident. The potential risk-based safety measures for preventing similar accidents are discussed. The application of the model confirms its robustness in estimating impact rate (degree) of human factor induced failures, consideration of the conditional dependency, and a dynamic and flexible modelling structure. 相似文献
2.
3.
4.
The deposition and the re-suspension of particulate matter (PM) in urban areas are the key processes that contribute not only to stormwater pollution, but also to air pollution. However, investigation of the deposition and the re-suspension of PM is challenging because of the difficulties in distinguishing between the resuspended and the deposited PM. This study created two Bayesian Networks (BN) models to explore the deposition and the re-suspension of PM as well as the important influential factors. The outcomes of BN modelling revealed that deposition and re-suspension of PM10 occurred under both, high-traffic and low-traffic conditions, and the re-suspension of PM2.5 occurred under low-traffic conditions. The deposition of PM10 under low-volume traffic condition is 1.6 times higher than under high-volume traffic condition, which is attributed to the decrease in PM10 caused by relatively higher turbulence under high-volume traffic conditions. PM10 is more easily resuspended from road surfaces compared to PM2.5 as the particles which larger than the thickness of the laminar airflow over the road surface are more easily removed from road surfaces. The increase in wind speed contributes to the increase in PM build-up by transporting particulates from roadside areas to the road surfaces and the airborne PM2.5 and PM10 increases with the increase in relative humidity. The study outcomes provide a step improvement in the understanding of the transfer processes of PM2.5 and PM10 between atmosphere and urban road surfaces, which in turn will contribute to the effective design of mitigation measures for urban stormwater and air pollution. 相似文献
5.
对熏烟扩散模式应用的探讨 总被引:5,自引:0,他引:5
工程上应用的大气污染物扩散模式中 ,熏烟模式由于其非定常性而与其他扩散模式有很大的区别。正确处理模式中各参数及变量的相互关系才能客观地反映污染物对环境影响的结果。本研究通过对熏烟模式的非定常性和各参数、变量相互关系的分析 ,提出了正确使用该模式的方法 相似文献
6.
The printed circuit board (PCB) manufacturers face several problems regarding the waste they generate. In Austria, a detailed study for waste minimization was carried out with three PCB manufacturers and one electroplating company. In this project a lot of ecologically and economically effective options were found and implemented. The ecological evaluation of processes is still an unsolved problem. Several evaluation models are tested on selected processes of the project. 相似文献
7.
控制和降低城市上空SO2的环境浓度对于改善城市环境,促进城市生态的良性循环具有十分重要的意义。本文从上海市绿化三维量分布模型、与SO2浓度分布模型的相关分析入手,以季节变化作为对比因子,讨论了城市绿化植物群的数量及分布对城市上空SO2浓度分布的宏观影响;并据此提出了可有效地控制城市上空SO2浓度的绿地建设的基本原则。 相似文献
8.
《环境科学学报(英文版)》2023,35(2):42-49
Growing studies have linked metal exposure to diabetes risk. However, these studies had inconsistent results. We used a multiple linear regression model to investigate the sex-specific and dose-response associations between urinary metals (cobalt (Co) and molybdenum (Mo)) and diabetes-related indicators (fasting plasma glucose (FPG), hemoglobin A1c (HbA1c), homeostasis model assessment for insulin resistance (HOMA-IR), and insulin) in a cross-sectional study based on the United States National Health and Nutrition Examination Survey. The urinary metal concentrations of 1423 eligible individuals were stratified on the basis of the quartile distribution. Our results showed that the urinary Co level in males at the fourth quartile (Q4) was strongly correlated with increased FPG (β = 0.61, 95% CI: 0.17–1.04), HbA1c (β = 0.31, 95% CI: 0.09–0.54), insulin (β = 8.18, 95% CI: 2.84–13.52), and HOMA–IR (β = 3.42, 95% CI: 1.40–5.44) when compared with first quartile (Q1). High urinary Mo levels (Q4 vs. Q1) were associated with elevated FPG (β = 0.46, 95% CI: 0.17–0.75) and HbA1c (β = 0.27, 95% CI: 0.11–0.42) in the overall population. Positive linear dose-response associations were observed between urinary Co and insulin (Pnonlinear = 0.513) and HOMA–IR (Pnonlinear = 0.736) in males, as well as a positive linear dose-response relationship between urinary Mo and FPG (Pnonlinear = 0.826) and HbA1c (Pnonlinear = 0.376) in the overall population. Significant sex-specific and dose-response relationships were observed between urinary metals (Co and Mo) and diabetes-related indicators, and the potential mechanisms should be further investigated. 相似文献
9.
IntroductionCleaningthefineparticlesinhightemperature (450℃ -950℃ )andhighpressureconditioncanenhancethethermalefficiencyofcleancoaltechnologiessuchasIGCCorPFBC .Rigidceramicfiltersofavarietyofstructuresareunderdevelopmentinprogramsaroundtheworld ,whichcanfi… 相似文献
10.