全文获取类型
收费全文 | 2813篇 |
免费 | 50篇 |
国内免费 | 35篇 |
专业分类
安全科学 | 1174篇 |
废物处理 | 13篇 |
环保管理 | 382篇 |
综合类 | 774篇 |
基础理论 | 179篇 |
环境理论 | 1篇 |
污染及防治 | 100篇 |
评价与监测 | 179篇 |
社会与环境 | 57篇 |
灾害及防治 | 39篇 |
出版年
2024年 | 3篇 |
2023年 | 30篇 |
2022年 | 20篇 |
2021年 | 77篇 |
2020年 | 114篇 |
2019年 | 33篇 |
2018年 | 23篇 |
2017年 | 47篇 |
2016年 | 78篇 |
2015年 | 69篇 |
2014年 | 110篇 |
2013年 | 102篇 |
2012年 | 112篇 |
2011年 | 133篇 |
2010年 | 93篇 |
2009年 | 157篇 |
2008年 | 111篇 |
2007年 | 104篇 |
2006年 | 103篇 |
2005年 | 140篇 |
2004年 | 172篇 |
2003年 | 145篇 |
2002年 | 110篇 |
2001年 | 73篇 |
2000年 | 124篇 |
1999年 | 127篇 |
1998年 | 102篇 |
1997年 | 65篇 |
1996年 | 59篇 |
1995年 | 82篇 |
1994年 | 33篇 |
1993年 | 49篇 |
1992年 | 34篇 |
1991年 | 22篇 |
1990年 | 10篇 |
1989年 | 7篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1979年 | 1篇 |
1977年 | 2篇 |
排序方式: 共有2898条查询结果,搜索用时 796 毫秒
951.
目前,生态文明视角下县域经济产业结构调整面临着工业化快速发展和生态环境日益恶化的局面,面对新的挑战,一方面必须大力发展县域绿色经济、建立县域生态消费保障机制;另一方面要转变传统产业发展模式,通过以产业结构重组实现产业结构生态化,推进生态产业发展,从而创造出一种由生态产业支撑的循环经济发展模式。 相似文献
952.
953.
954.
Kontogiannis T 《Journal of Safety Research》2011,42(2):73-85
Introduction
Research in human error has provided useful tools for designing procedures, training, and intelligent interfaces that trap errors at an early stage. However, this “error prevention” policy may not be entirely successful because human errors will inevitably occur. This requires that the error management process (e.g., detection, diagnosis and correction) must also be supported. Research has focused almost exclusively on error detection; little is known about error recovery, especially in the context of safety critical systems. The aim of this paper is to develop a research framework that integrates error recovery strategies employed by experienced practitioners in handling their own errors.Method and Results
A control theoretic model of human performance was used to integrate error recovery strategies assembled from reviews of the literature, analyses of near misses from aviation and command & control domains, and observations of abnormal situations training at air traffic control facilities. The method of system dynamics has been used to analyze and compare error recovery strategies in terms of patterns of interaction, system affordances, and types of recovery plans. System dynamics offer a promising basis for studying the nature of error recovery management in the context of team interactions and system characteristics.Impact on industry
The proposed taxonomy of error recovery strategies can help human factors and safety experts to develop resilient system designs and training solutions for managing human errors in unforeseen situations; it may also help incident investigators to explore why people's actions and assessments were not corrected at the time. 相似文献955.
制定适合企业自身发展的职业安全健康方针至关重要,然而目前这方面的研究相对较少。本文收集了国内27家、国外10家知名企业的职业安全健康方针,统计分析了国内外职业安全健康方针在形式和内容上的区别与联系。通过定性分析和定量研究,得出国外企业职业安全健康方针的共性特点和国内企业职业安全健康方针的最常见组合模式。理论联系实际,将我国《职业安全健康管理体系规范(》GB/T28001-2004)中方针的编写要求与研究结论相结合,探讨在新形势下,如何制定企业职业安全健康方针的方法。 相似文献
956.
Malika Ghazi Gaetana Quaranta Joelle Duplay Raja Hadjamor Mohamed Khodja Hamid Ait Amar Zoubir Kessaissia 《Resources, Conservation and Recycling》2011,55(12):1222-1231
The objective of this work is to assess the environmental impacts of the drilling mud system in Algeria's arid region. Water-based mud (WBM) and oil-based mud (OBM) are used during well drilling in Hassi Messaoud petroleum field, and have a considerable pollution potential particularly on the aquifer system which constitutes the single resource of drinking water in the Sahara. The Life-Cycle Assessment (LCA) approach is applied to evaluate the impacts of several drilling mud systems across all stages of their life cycle, e.g. use, treatment and disposal. Environmental impacts of five treatments scenarios corresponding to the drilling waste management applied in Hassi Messaoud are compared: reserve pit without treatment (burial option), secondary high centrifugation (vertical cuttings dryer), stabilisation/solidification online, stabilisation/solidification off line and thermal desorption. The impact assessment is carried on using the LCIA models of Impact 2002+ method in SIMAPRO7 software. This assessment identifies human toxicity and terrestrial eco-toxicity as the major impact categories in this specific arid context and quantifies the emissions contributions. The local environmental impact is the most important of the drilling mud life cycle and is mainly linked to emissions from reserve pits, treated cuttings, and drilling phase 16″ through the Turonian and Albian aquifer. The main contributing substances are aromatic hydrocarbons fraction and metals in particular barium, zinc, antimony, arsenic, and aluminium. Concerning the comparison of the treatment scenarios, it appears that stabilisation/solidification online is the best one; it has the lowest impact score in the two dominating categories because of the waste minimisation: mud storage avoided in the reserve pit. The second best scenario is the thermal desorption which obtains the lowest impact score in carcinogen effects due to hydrocarbons reduction (<1%) and avoided impacts of recovered oil. The toxic substances fate modeling will be improved by taking into account their site-specific impact. 相似文献
957.
Wetlands research and restoration has become one of the critical concern due to their importance in providing ecosystem services. This study proposes a holistic methodology to assess the wetland ecosystem based on cosmic exergy as a thermodynamic orientor. This new approach is applied to two typical wastewater treatment facilities (an activated sludge system and a cyclic activated sludge system) and to a constructed wetland ecosystem in Beijing for comparison. Results show that the Beijing wetland ecosystem gains positive net present ecological value of 3.08E+14 Jc regarding its total life cycle. Comparison with the activated sludge system and cyclic activated sludge system, shows that the wetland ecosystem has greater dependencies on local resources (22% vs. 0% vs. 0%) and renewable resources (67% vs. 38% vs. 31%) as well as a larger ecological sustainability index (0.64157 vs. 0.00005 vs. 0.00008). This implies that the wetland ecosystem is more environmentally friendly and sustainable method for water treatment. 相似文献
958.
Gert Everaert Pieter BoetsKoen Lock Sašo D?eroskiPeter L.M. Goethals 《Ecological modelling》2011,222(14):2202-2212
Polder lakes in Flanders are stagnant waters that were flooded by the sea in the past. Several of these systems are colonized by exotic species, but have hardly been studied until present. The aim of the present study was: (1) to assess the influence of exotic macrobenthic species on the outcome of the Multimetric Macroinvertebrate Index Flanders (MMIF) and (2) to use classification trees for evaluating to what extent physical-chemical characteristics affect the presence of exotic species.In total, 27 mollusc and 10 macro-crustacean species were present in the monitored lakes of which respectively five and four were exotic. The exclusion of the exotic species from the MMIF resulted in a significant decline of this ecological index (−0.03 ± 0.04; p = 0.00). This elimination often resulted into a lower ecological water quality class and more samples were classified into the bad and poor ecological water quality classes.Single-target classification trees for Gammarus tigrinus and Potamopyrgus antipodarum were constructed, relating environmental parameters and ecological status (MMIF) to the occurrence of both exotic invasive species. The major advantages of using single-target classification trees are the transparency of the rule sets and the possibility to use relatively small datasets. However, this classification technique only predicts a single-target attribute and the trees of the different species are often hard to integrate and use for water managers. As a solution, a multi-target approach was used in the present study. Exotic molluscs and crustaceans communities were modelled based on environmental parameters and the ecological status (MMIF) using multi-target classification trees. Multi-target classification trees can be used in management planning and investment decisions as they can lead to integrated decisions for the whole set of exotic species and avoid the construction of many models for each individual species. These trees provide general insights concerning the occurrence patterns of individual crustaceans and molluscs in an integrated way. 相似文献
959.
G.R. Larocque D. MaillyT.-X. Yue M. AnandC. Peng C. KazanciM. Etterson P. GoethalsS.E. Jørgensen J.R. SchramskiE.J.B. McIntire D.J. MarceauB. Chen G.Q. ChenZ.F. Yang B. NovotnaN. Luckai J.S. BhattiJ. Liu A. MunsonA.M. Gordon J.C. Ascough II 《Ecological modelling》2011,222(14):2456-2468
The eleven symposia organized for the 2009 conference of the International Society for Ecological Modelling (ISEM 2009) held in Quebec City, Canada, October 6-9, 2009, included facilitated discussion sessions following formal presentations. Each symposium focused on a specific subject, and all the subjects could be classified into three broad categories: theoretical development, population dynamics and ecosystem processes. Following discussions with the symposia organizers, which indicated that they all shared similar issues and concerns, the facilitated discussions were task-oriented around four basic questions: (1) key challenges in the research area, (2) generating and sharing new ideas, (3) improving collaboration and networking, and (4) increasing visibility to decision-makers, partners and clients. Common challenges that emerged from the symposia included the need for improved communication and collaboration among different academic disciplines, further progress in both theoretical and practical modelling approaches, and accentuation of technology transfer. Regarding the generation and sharing of new ideas, the main issue that emerged was the type of positive interactions that should be encouraged among potential collaborators. The usefulness of the Internet, particularly for the sharing of open-source software and conducting discussion forums, was highlighted for improving collaboration and networking. Several communication tools are available today, and it is important for modellers to use them more intensively. Visibility can be increased by publishing professional newsletters, maintaining informal contacts with the public, organizing educational sessions in primary and secondary schools, and developing simplified analytical frameworks and pilot studies. Specific issues raised in each symposium are also discussed. 相似文献
960.