全文获取类型
收费全文 | 298篇 |
免费 | 46篇 |
国内免费 | 19篇 |
专业分类
安全科学 | 48篇 |
废物处理 | 16篇 |
环保管理 | 84篇 |
综合类 | 109篇 |
基础理论 | 43篇 |
环境理论 | 1篇 |
污染及防治 | 12篇 |
评价与监测 | 4篇 |
社会与环境 | 34篇 |
灾害及防治 | 12篇 |
出版年
2023年 | 6篇 |
2022年 | 17篇 |
2021年 | 28篇 |
2020年 | 20篇 |
2019年 | 21篇 |
2018年 | 18篇 |
2017年 | 13篇 |
2016年 | 27篇 |
2015年 | 17篇 |
2014年 | 9篇 |
2013年 | 19篇 |
2012年 | 15篇 |
2011年 | 18篇 |
2010年 | 14篇 |
2009年 | 15篇 |
2008年 | 15篇 |
2007年 | 9篇 |
2006年 | 17篇 |
2005年 | 15篇 |
2004年 | 8篇 |
2003年 | 6篇 |
2002年 | 6篇 |
2001年 | 10篇 |
2000年 | 5篇 |
1999年 | 5篇 |
1997年 | 5篇 |
1995年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1986年 | 1篇 |
排序方式: 共有363条查询结果,搜索用时 31 毫秒
291.
292.
为解决目前我国防灾减灾信息化建设中出现各自为政、低水平重复建设、信息资源整合共享不足等全局性问题和提高防灾减灾综合业务能力,研究防灾减灾信息化顶层设计问题。总结现有防灾减灾功能业务,用自上而下的顶层设计原则和自下而上的实施步骤,将信息化顶层设计内容划分为信息资源规划、信息技术规划、环境保障规划。最后,建立防灾减灾信息系统的总体目标架构。各防灾减灾相关部门可在此基础上根据业务横向整合的原则,划分防灾减灾信息系统的各个子系统。 相似文献
293.
Since its inception, the STPA technique has gained increasing popularity among researchers and industry practitioners. Nevertheless, the validity of its application has not yet received much scientific attention. Although some informal validation approaches have been used by STPA users, no formalized validation framework has been elaborated for practical use. This paper investigates the reasonableness of the recently proposed STPA validation framework, which includes 15 validation tests, each focusing on a specific step of an STPA analysis. To do so, STPA experts in both academia and industry were interviewed. First, it is investigated what approaches they have been using for validating an STPA analysis, the findings of which were categorized and mapped with the proposed validation framework. This aims to investigate the similarities and dissimilarities between the theory-based validation framework and the informal methods applied by experts in current practice. Then, the proposed framework was presented to the interviewees to seek their judgments about its reasonableness. Feedback from practitioners indicated that the proposed STPA validation framework has certain strengths, while several opportunities exist for further improvement. In particular, the findings indicate that most of the proposed theory-based tests have been already used by STPA experts in an unstructured manner. The experts appreciated the framework in that it provides clear guidance on how to validate each step of an STPA analysis systematically, and found some additional theory-based tests interesting for consideration in practice. The results also suggest that further research is needed to develop systematic techniques for performing each test to facilitate its application by STPA experts. 相似文献
294.
徐文辉 《中国安全科学学报》2007,17(10):133-139
通过对上海市安全生产"十一五"发展规划中重大科研攻关项目重大危险源监控和应急救援信息系统建设方案的研究,对整个系统的总体框架的搭建进行了初步探索。整个系统总体框架以企业安全生产管理系统、数据分析评估系统、事故应急救援指挥系统、GIS空间数据管理系统和GIS地理统计分析系统5大部分构成,辅以国际上先进的风险评估软件,使信息系统的建设更具先进性,为上海市预防和遏制重特大事故的发生,提高应急能力提供了保障条件。 相似文献
295.
According to the logic process of carbon reduction in China which arises from the measurement to reduction, from reduction to offsetting, the measurement of carbon emission in the tourism industry was the first and key step. Based on the life cycle assessment theory and input–output analysis, this article used economic and environmental measurement technologies, The System of National Accounting (SNA), Tourism Satellite Account (TSA), System of Integrated Environment and Economic Accounting (SEEA), and so on, and built up a top-down carbon emission analysis framework for the tourism industry and estimated carbon emission of the tourism industry in China in 2007. The finding showed that the total carbon emission of the tourism industry in China in 2007 was 169.78 million tons, covering 2.71% of carbon emission of all industries in China in 2007, and 2.44% of the total carbon emission in China in 2007. The direct carbon emission of the tourism industry in China in 2007 was 73.56 million tons, including transportation (50.14 million tons), sightseeing (1.33 million tons), lodging (4.19 million tons), accommodation (4.73 million tons), shopping (8.14 million tons), entertainment (0.67 million tons), communication (0.45 million tons), and others (3.90 million tons). The indirect carbon emission of the tourism industry in China in 2007 was 96.23 million tons, mostly contributed by coking, gas, and petroleum processing industries, transportation and warehousing industry, machinery and equipment manufacturing industry, and food manufacturing and tobacco processing industry, which covered 57%. 相似文献
296.
In recent years, there has been a boom in environmental assessment reports utilizing environmental indicators. Most of these
publications are based on the casual chain frameworks (e.g., Pressure–State–Response (PSR), Driving force–State–Response (DSR),
and Driving force–Pressure–State–Impact–Response (DPSIR)). These frameworks have made an important contribution by emphasising
the importance of causality. However, the reliance on simple uni-directional chains is at the same time not very conducive
to a good understanding of the complexity of the processes behind environmental indicators. This limits the usefulness of
these frameworks for environmental (impact) assessments. In this paper we propose an enhanced DPSIR (eDPSIR) framework for
environmental indicators that takes inter-relations of indicators into account by relying on the use of causal networks rather
than causal chains. It will be shown how the concept of causal networks can increase insight into the inter-relation of environmental
issues and associated indicators, can facilitate the identification of key indicators for particular kinds of questions, and
can provide a useful first step to the establishment of dose–response functions. Working with causal networks can contribute
to more appropriate environmental policies and better management decisions. 相似文献
297.
Mike Hutchins Carlo Fezzi Ian Bateman Paulette Posen Amelie Deflandre-Vlandas 《Environmental management》2009,44(2):256-267
A case study of the Yorkshire Derwent (UK) catchment is used to illustrate an integrated approach for assessing the viability
of policy options for reducing diffuse nitrate losses to waterbodies. For a range of options, modeling methods for simulating
river nitrate levels are combined with techniques for estimating the economic costs to agriculture of modifying those levels.
By incorporating spatially explicit data and information on catchment residence times (which may span many decades particularly
in areas of groundwater discharge) a method is developed for efficient spatial targeting of measures, for example, to the
most at-risk freshwater environments. Combining hydrological and economic findings, the analysis reveals that, in terms of
cost-effectiveness, the ranking of options is highly sensitive to both (i) whether or not specific stretches of river within
a catchment are regarded as a priority for protection, and (ii) the criterion of nitrate concentration deemed most appropriate
as an indicator of the health of the environment. Therefore, given the focus under European legislation upon ecological status
of freshwaters, these conclusions highlight the need to improve understanding of mechanistic linkages between the chemical
and biological dynamics of aquatic systems. 相似文献
298.
本文主要讨论军用通信舱室组合机柜电气和结构设计方面的基本技术要求,并在可靠性设计方面提出了相关的要求。 相似文献
299.
Nurul K. Wan Ahmad Marisa P. de Brito Jafar Rezaei Lóránt A. Tavasszy 《Journal of Environmental Planning and Management》2017,60(4):577-601
This paper proposes a framework for understanding the contextual factors of sustainable supply chain management (SSCM) practices in the O&G industry. It is based on a literature review of studies related to SSCM of O&G topics. The review reveals that there is a lack of SSCM research specific to the industry. Present studies focus on individual stages of its supply chain and do not consider all dimensions of sustainable development, namely economic, environmental and social factors. In addition, existing frameworks lack important contextual aspects of the industry's business and organizational environment. To address these gaps, our research develops an overarching framework operationalizing the internal and external contextual factors of the O&G industry environment that can influence the outcome of its SSCM practices. The proposed framework is useful as a tool in the formulation and implementation of SSCM strategy that enables alignment of a company's internal capabilities with its external environment. 相似文献
300.
Determining the performance of ecosystem services at the city or regional level cannot accurately take into account the fine differences between green or gray structures. The supply of regulating ecosystem services in, for instance, parks can differ as parks vary in their land cover composition. A comprehensive ecosystem service assessment approach also needs to reflect land use to consider the demands placed on ecosystem services, which are mostly neglected by current research yet important for urban planning. For instance, if a sealed surface is no longer used, it could be unsealed to improve ecosystem service supply. Because of these scientific shortcomings, this article argues for a conceptual framework for the non-monetary assessment of urban ecosystem services at the site scale. This paper introduces a standardized method for selecting representative sites and evaluating their supply of and demand on ecosystem services. The conceptual design is supplemented by examples of Salzburg, Austria. 相似文献