全文获取类型
收费全文 | 2671篇 |
免费 | 126篇 |
国内免费 | 107篇 |
专业分类
安全科学 | 776篇 |
废物处理 | 16篇 |
环保管理 | 526篇 |
综合类 | 694篇 |
基础理论 | 246篇 |
环境理论 | 2篇 |
污染及防治 | 118篇 |
评价与监测 | 140篇 |
社会与环境 | 133篇 |
灾害及防治 | 253篇 |
出版年
2024年 | 4篇 |
2023年 | 31篇 |
2022年 | 34篇 |
2021年 | 70篇 |
2020年 | 81篇 |
2019年 | 54篇 |
2018年 | 29篇 |
2017年 | 82篇 |
2016年 | 96篇 |
2015年 | 98篇 |
2014年 | 84篇 |
2013年 | 146篇 |
2012年 | 140篇 |
2011年 | 224篇 |
2010年 | 120篇 |
2009年 | 168篇 |
2008年 | 143篇 |
2007年 | 163篇 |
2006年 | 137篇 |
2005年 | 144篇 |
2004年 | 120篇 |
2003年 | 135篇 |
2002年 | 95篇 |
2001年 | 68篇 |
2000年 | 69篇 |
1999年 | 60篇 |
1998年 | 34篇 |
1997年 | 44篇 |
1996年 | 28篇 |
1995年 | 31篇 |
1994年 | 24篇 |
1993年 | 36篇 |
1992年 | 25篇 |
1991年 | 17篇 |
1990年 | 9篇 |
1989年 | 9篇 |
1988年 | 5篇 |
1987年 | 8篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1981年 | 9篇 |
1980年 | 3篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有2904条查询结果,搜索用时 500 毫秒
481.
应用现代信息技术及装备,设计开发“企业+监理+承包商”三级一体化工程项目HSSE管理支撑系统,具有人员管理、培训考试、施工机具管理、风险管理、监督检查、考核奖惩等主要业务流程管理功能,同时提供专家知识库支持,有效支撑项目HSSE管理。多个项目应用结果表明,该系统满足企业、监理和承包商对项目实施一体化HSSE管理的需要,优化了各业务环节管理流程,加强了管控手段,有效解决了人员能力不足、责任不落实等问题,促进了HSSE工作的规范化、标准化、精细化、高效化,具有广阔的推广应用前景。 相似文献
482.
为正确引导和控制负面安全舆情,基于安全信息学与舆情理论,利用事故树分析方法研究安全舆情演化过程,计算负面安全舆情最小割集、最小径集和结构重要度,提出安全舆情引导方法。结果表明:利用最小割集得到负面安全舆情产生原因组合,利用最小径集得到避免负面安全舆情产生最低限度事件组合,通过结构重要度得到系统改进重点及优化顺序;在事故树中增加安全舆情审核和引导组织、安全事件亲自确认、专业意见领袖3个最小径集,以期减少负面安全舆情,促进公共安全。 相似文献
483.
引水明渠的安全运行风险评价对减少和预防其在输水运行过程中的灾害发生、提高其在运营期间的社会经济效益具有重要的意义。为了对引水明渠在运行期间的风险进行合理赋权和评价,通过科学合理的方法构建了多指标参数的明渠运行风险影响因素指标体系,包括主体结构风险、自然风险、水污染风险、组织管理风险和运行调度风险5个风险因子子系统及20个二级指标在内的评价指标体系;运用G1和VPRS法分别确定各指标的主观权重和客观权重,结合MIE理论优化指标权重;根据明渠工程的运行特点,选取多层次灰色理论计算引水明渠运行风险值,并根据相关规范和安全风险评价实践确定风险评价等级。将该模型应用于引大入秦工程中,结果表明:采用序关系分析法(G1法)和变精度粗糙集理论(VPRS)并结合最小信息熵原理(MIE)的权重确定方法(G1-VPRS-MIE),不但避免了层次分析法过度依赖专家的主观经验、克服了粗糙集理论在边界刻画的局限性,而且弥补了主观和客观方法相结合的不足;对于指标权重的确定更加客观合理,既能满足所得权重的客观性,也能保证评估结果具有一定的解释性,同时能够减少单一权重计算的偏差;多层次灰色评价模型对于引水明渠安全运行风险等级的确定较为有效,并得出其风险等级为中等偏高,与实际情况一致。研究成果为引水明渠工程安全运行提供了一定的参考,同时可为类似气候环境的引水明渠区域规划、设计、施工提供有效的借鉴。 相似文献
484.
485.
基于GIS技术的危险废物资源管理系统的研究 总被引:2,自引:1,他引:1
文章将地理信息技术引入到危险废物管理中,主要通过对基于GIS危险废物管理信息系统的设计,将危险废物管理、计算机和GIS技术结合在一起,为城市的危险废物提供一个快捷、方便、科学的管理和决策支持的计算机系统。通过该系统的开发,能有效管理分布在城市各处的危险废物,减轻其对城市及周边环境的污染,对城市的开发建设和环境保护起到一定的借鉴作用。 相似文献
486.
487.
环境与健康是人类永恒的主题。本文介绍了环境与健康的关系,总结了在全球气候变化、臭氧层损耗、生物多样性的丧失、土地荒漠化和干旱、环境污染以及城市化等多方面给人类健康带来的影响,探讨了人体总暴露研究、地理信息系统技术在本领域的应用,最后概括了我国在这一领域的研究现状。 相似文献
488.
Vulnerability assessment and adaptation to the impacts of sea level rise on the Kingdom of Bahrain 总被引:2,自引:0,他引:2
S. Al-Jeneid M. Bahnassy S. Nasr M. El Raey 《Mitigation and Adaptation Strategies for Global Change》2008,13(1):87-104
This paper assesses quantitatively the impact of sea level rise (SLR) at the global and regional scale as a result of climate
change (CC) on the coastal areas of the Kingdom of Bahrain’s islands (36 Islands). The standard Intergovernmental Panel on
Climate Change (IPCC) guidelines was modified as appropriate for the situation of the study area. Geographic Information Systems
(GIS) coupled with Remote Sensing (RS) were used as the main techniques of collecting, analyzing, modeling simulating and
disseminating information to build SLR scenarios in a geographically referenced context. Also, these tools were used to assess
vulnerability and risk of the coastal area of the islands with the expectation that coastal planner and government authorities
will profit from integrating these knowledge into a broad based environmental decision making. Three SLR scenarios: low, moderate
and high were developed to examine the impacts from SLR on all islands. The low SLR scenario (Optimistic) assumes a 0.5-m
rise above current sea level, the moderate scenario (Intermediate) assumes a one meter rise, and the high scenario (Pessimistic)
assumes a 1.5 m rise in sea level. Two more SLR scenarios were assumed to perform risk analysis, a 2 and 5 meter rise above
current sea level. The simulation of SLR are quite straightforward, emphasizing on the uses of both of the data that are incorporated
from the satellite images and the created Digital Elevation Model (DEM) to estimate SLR scenarios that are adapted in the
study. These data were used to predict consequences of the possibility of the rise in sea level at different scenarios which
may alter the landuse and patterns of human communities. Results indicate that low-lying coastal areas of Bahrain islands
are at risk from the effects of any SLR resulting from CC. These islands are vulnerable under different SLR Scenarios. More
than 17% of the country total area may be inundated under 1.5 m SLR in 2100. The total area that might be lost under different
sea level scenarios will vary from more than 77 km2 if SLR reaches 0.5 m, to about 100 km2 under 1.0 m SLR and may reach 124 km2 under 1.5 m SLR scenario. The total inundated areas due to risk scenarios will reach 133 km2, if the SLR rises to 2.0 m, and it is estimated to be more than (22%) of the main island total area. Under the second scenario,
if the SLR reaches 5.0 m, the main islands will lose approximately half of its area (47%) equal to 280 km2. Hawar islands group will lose about (30%) of its total area under 2.0 m SLR, which is about 15.5 km2.A SLR adaptation policy framework (APF) and adaptation policy initiatives (APIs) are suggested for planners to build upon
for reducing the likely effects of SLR in the Kingdom of Bahrain. The framework is composed of four steps namely, acquisition
of information, planning and design, implementation and monitoring and evaluation. A general policy framework for a national
response to SLR is suggested. Additionally, a range of policy adaptation options/initiatives to sustain coastal developments
under the likely effects of SLR are recommended. 相似文献
489.
Asako Takimoto P. K. Ramachandran Nair Janaki R. R. Alavalapati 《Mitigation and Adaptation Strategies for Global Change》2008,13(7):745-761
The recognition of agroforestry as a greenhouse-gas mitigation strategy under the Kyoto Protocol to the United Nations Framework
Convention on Climate Change (UNFCCC) offers an opportunity to agroforestry practitioners to benefit from the global Carbon
(C) credit market. Our knowledge on this important topic from the semiarid regions such as the West African Sahel (WAS) is,
however, very limited. In order to fill this gap, this study was undertaken in the Ségou region of Mali (annual temperature,
29°C; annual rainfall, 300–700 mm in 60 to 90 days), focusing on two improved agroforestry systems (live fence and fodder
bank) along with traditional parkland agroforestry systems of the region. A cost–benefit analysis was conducted to assess
the economic profitability and risks associated with the systems considering them as 25-year projects and their potential
for participation in C credit market. The traditional systems had high C stock in their biomass and soil, but little potential
for sequestering additional C; on the other hand, the improved systems had low C stock, but high sequestration potential.
For the standard size live fence (291 m) and fodder bank (0.25 ha) projects, the estimated net present values (NPV) were $
96.0 and $158.8 without C credit sale, and $109.9 and $179.3 with C sale, respectively. From the C sale perspective, live
fence seemed less risky and more profitable than fodder bank. Carbon credit sale is likely to contribute to economic development
of the subsistence farmers in the WAS.
相似文献
Asako TakimotoEmail: |
490.
企业环境等级评价制度将公众第三方引入环境管理体系,着重分析三方在管理中的各自作用,以及如何实现利益的最大化。公众的参与是核心,政府引导是保证企业环境等级评价制度顺利和健康实施的基础,而企业可以通过环境等级评价提高企业环境信息的透明度,并进一步利用市场增大企业的利益。 相似文献