全文获取类型
收费全文 | 1586篇 |
免费 | 25篇 |
国内免费 | 43篇 |
专业分类
安全科学 | 460篇 |
废物处理 | 20篇 |
环保管理 | 247篇 |
综合类 | 452篇 |
基础理论 | 102篇 |
污染及防治 | 128篇 |
评价与监测 | 122篇 |
社会与环境 | 45篇 |
灾害及防治 | 78篇 |
出版年
2023年 | 20篇 |
2022年 | 16篇 |
2021年 | 51篇 |
2020年 | 59篇 |
2019年 | 26篇 |
2018年 | 15篇 |
2017年 | 39篇 |
2016年 | 58篇 |
2015年 | 68篇 |
2014年 | 68篇 |
2013年 | 96篇 |
2012年 | 59篇 |
2011年 | 125篇 |
2010年 | 53篇 |
2009年 | 114篇 |
2008年 | 96篇 |
2007年 | 71篇 |
2006年 | 60篇 |
2005年 | 72篇 |
2004年 | 64篇 |
2003年 | 59篇 |
2002年 | 42篇 |
2001年 | 27篇 |
2000年 | 34篇 |
1999年 | 42篇 |
1998年 | 32篇 |
1997年 | 30篇 |
1996年 | 24篇 |
1995年 | 20篇 |
1994年 | 21篇 |
1993年 | 31篇 |
1992年 | 16篇 |
1991年 | 6篇 |
1990年 | 6篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1987年 | 6篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 7篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有1654条查询结果,搜索用时 15 毫秒
21.
22.
23.
大伙房水库上游矿产企业的潜在风险研究 总被引:2,自引:0,他引:2
对大伙房水库上游矿产企业尾矿库进行样品采集,分析其矿渣及渗滤液特征污染因子含量,并与库区沉积物中重金属含量进行比对,结果表明:金矿、铜矿的尾矿库对水库水质安全潜在威胁较大,铁矿次之,分析其污染成因,提出防范措施。 相似文献
24.
基于GIS的海岛生态脆弱性评价研究与实践——以海坛岛为例 总被引:2,自引:0,他引:2
基于生态敏感度、生态弹性度和生态压力度,构建了海岛生态脆弱性评价的指标体系,采用综合指数法和GIS相结合的方法对海坛岛的生态脆弱性进行了定量评价,并绘制了生态脆弱性等级分布图,分析了生态脆弱度的空间差异和不同区域生态脆弱性的主导成因.评价结果与该区域的生态环境状况较为一致,对于海坛岛的生态保护和资源利用具有一定的指导意... 相似文献
25.
水稻生产气象灾害危险性分析:—以湖南省常德市水稻生产为例 总被引:2,自引:0,他引:2
本文通过对研究区水稻气象灾害规律的研究和危险性评价,计算了不同等级的水稻综合风险率,为保险部门制定水稻保险费率提供了科学依据. 相似文献
26.
27.
Film boiling chemical vapor infiltration (FB-CVI) is considered as one of the fastest process methodologies for manufacturing carbon-carbon (C–C) composite products and possesses various advantages compared to conventional methodologies. However, there are safety concerns associated with this process for large-scale manufacturing, mainly owing to the intrinsic nature of the precursor and the process conditions. Considering the multifunctional interactions of the various systems during the process, a system-theoretic process analysis (STPA)/system theoretic accident model and process (STAMP) model is used to perform a safety analysis of the hazardous states of the FB-CVI process at the system level. As a case study, the FB-CVI process equipment employed for the manufacturing of C–C composites is considered. The safety constraints present in the system are assessed for adequacy through a hazard analysis by STPA/STAMP. The analysis through STPA/STAMP demonstrated the capability to create proactive strategies for the design and realization of process equipment that can be employed to manufacture C–C composite products through the FB-CVI process. 相似文献
28.
Incineration is the main option for residual Municipal Solid Waste treatment in France. This study compares the environmental performances of 110 French incinerators (i.e. 85% of the total number of plants currently in activity in France) in a Life Cycle Assessment perspective, considering 5 non-toxic impact categories: climate change, photochemical oxidant formation, particulate matter formation, terrestrial acidification and marine eutrophication. Mean, median and lower/upper impact potentials are determined considering the incineration of 1 tonne of French residual Municipal Solid Waste. The results highlight the relatively large variability of the impact potentials as a function of the plant technical performances. In particular, the climate change impact potential of the incineration of 1 tonne of waste ranges from a benefit of ?58 kg CO2-eq to a relatively large burden of 408 kg CO2-eq, with 294 kg CO2-eq as the average impact. Two main plant-specific parameters drive the impact potentials regarding the 5 non-toxic impact categories under study: the energy recovery and delivery rate and the NOx process-specific emissions. The variability of the impact potentials as a function of incinerator characteristics therefore calls for the use of site-specific data when required by the LCA goal and scope definition phase, in particular when the study focuses on a specific incinerator or on a local waste management plan, and when these data are available. 相似文献
29.
Facility Siting is an important phase of project development. A critical stage is plot plan optimisation, where significant potential hazards are eliminated due to equipment spacing. In addition to ensuring appropriate compliance with minimum spacing requirements, occupied building studies to achieve compliance with the requirements of API 752 and API 753 could also be undertaken to optimise safety outcomes. The studies are done in three stages, where the first stage is hazard identification, second stage is consequence assessment and the third stage is risk assessment. Third stage assessments are only carried, if the consequence based siting recommendations are not practical to implement.This paper presents the challenges in estimating risk due to process hazards with a focus on selecting right event likelihood data. A comparison is presented on the variation in predicted risk levels based on equipment failure rates and leak frequencies.Case study of a plot plan optimisation study is undertaken with DNVGL Phast Risk and the variation in risk levels up to two orders of magnitude are recorded. Challenges such as adaption of data for local conditions, consistent definitions of failure, sample size of data, applicability of data play a significant role in identifying and correctly quantifying the risk levels. Such challenges and its impact on risk quantification are presented in this paper as well as its impact on facility siting. 相似文献
30.
A model of multiple domino scenarios and the risk of the domino effect, which is a sequential chain escalating from the primary unit to the last unit, is presented in this paper. The trajectories of fragments from all units, the ground distribution of projectiles, and the risk of the sequential chain of the domino effect were calculated using Monte Carlo simulations. The results showed that the range affected by the fragments from each tank included the other tanks, meaning that fragments from one tank could hit the other tanks and cause multiple accidents, and that the sequential chain of the domino effect could indeed happen. The distributions of ground impacts showed that tank fragments were projected over long distances, up to 1200 m from the source. The spatial distribution of the kinetic energy at ground impact for tank fragments was also obtained. Moreover, the magnitudes of the probabilities of the primary, secondary, third, and fourth accidents in the domino chain were respectively about 10−7, 10−11, 10−15, and 10−19. These results showed that for neighboring domino effect units in the same accident chain, the risk of the most recent domino effect was 104 times that of the following domino effect. 相似文献