全文获取类型
收费全文 | 1634篇 |
免费 | 20篇 |
国内免费 | 53篇 |
专业分类
安全科学 | 79篇 |
废物处理 | 34篇 |
环保管理 | 247篇 |
综合类 | 990篇 |
基础理论 | 114篇 |
污染及防治 | 118篇 |
评价与监测 | 70篇 |
社会与环境 | 34篇 |
灾害及防治 | 21篇 |
出版年
2024年 | 1篇 |
2023年 | 7篇 |
2022年 | 13篇 |
2021年 | 23篇 |
2020年 | 40篇 |
2019年 | 15篇 |
2018年 | 14篇 |
2017年 | 24篇 |
2016年 | 26篇 |
2015年 | 39篇 |
2014年 | 74篇 |
2013年 | 72篇 |
2012年 | 57篇 |
2011年 | 83篇 |
2010年 | 50篇 |
2009年 | 76篇 |
2008年 | 76篇 |
2007年 | 76篇 |
2006年 | 79篇 |
2005年 | 71篇 |
2004年 | 74篇 |
2003年 | 85篇 |
2002年 | 81篇 |
2001年 | 68篇 |
2000年 | 87篇 |
1999年 | 68篇 |
1998年 | 67篇 |
1997年 | 67篇 |
1996年 | 29篇 |
1995年 | 33篇 |
1994年 | 28篇 |
1993年 | 25篇 |
1992年 | 17篇 |
1991年 | 11篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 5篇 |
1985年 | 5篇 |
1984年 | 7篇 |
1983年 | 4篇 |
1982年 | 6篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 5篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有1707条查询结果,搜索用时 718 毫秒
801.
This article presents a case study of a successful effort to reach agreement on one of the most intractable environmental issues of our time: wolf management. This case is unusual in several ways. In this case, the members of the negotiating team were ordinary citizens rather than leaders of organized groups. This team was given an unusually high level of authority to write the plan as they saw fit; the agency pledged to implement “whatever they came up with.” The agency convened the process, but agency personnel were not members of the team and attended only when they were invited. The team members were able to reach agreement on this tough issue even though polar opposites were at the table—one who felt that wolves are a “spiritual essence” and another who felt that, as he put it, “wolves, coyotes, and cockroaches have a lot in common”. They produced a detailed plan that addressed all the issues in just 5 months. Another unusual aspect of this effort is that the final agreement does not list the team members. They explained that they wanted their plan to “stand alone” and be judged based on what it said, not on who was involved.However, just after their agreement was completed, a new, pro-wolf control government was elected that refused to endorse the plan. While the government gave various reasons for not ratifying the plan, more and more diverse interest groups came out in support for both the plan and the process that created it. Eventually, overwhelming public support forced the government to sign and implement the plan as written. This demonstrates that, while it is important for a team to seek the sanction of decision-makers, it is perhaps even more important for the general public to see the effort and the final agreement as fair. Strong support from a broad spectrum of the public can help win the necessary political support.In addition to discussing the unorthodox aspects of this consensus-building effort, this article also attempts to give the reader a front row seat to this process by using the informants' own words—words rich in detail, brimming with color and spoken straight from the heart. Certainly their experience dispels any notion that such efforts are simply a matter of following a recipe. During the process, members of the negotiating team experienced the entire gamut of emotions—anger, defeat, humor and, finally, a genuine sense of pride. As team member Patty Denison put it, “We showed that a random group of people could work together and do something truly monumental.” 相似文献
802.
803.
Antonio D. Dorado Shafik Husni Guillem Pascual Carles Puigdellivol David Gabriel 《Waste management (New York, N.Y.)》2014,34(2):344-351
Emissions of volatile organic compounds (VOCs) from the compost maturation building in a municipal solid waste treatment facility were inventoried by solid phase microextraction and gas chromatography–mass spectrometry. A large diversity of chemical classes and compounds were found. The highest concentrations were found for n-butanol, methyl ethyl ketone and limonene (ppmv level). Also, a range of compounds exceeded their odor threshold evidencing that treatment was needed. Performance of a chemical scrubber followed by two parallel biofilters packed with an advanced packing material and treating an average airflow of 99,300 m3 h?1 was assessed in the treatment of the VOCs inventoried. Performance of the odor abatement system was evaluated in terms of removal efficiency by comparing inlet and outlet abundances. Outlet concentrations of selected VOCs permitted to identify critical odorants emitted to the atmosphere. In particular, limonene was found as the most critical VOC in the present study. Only six compounds from the odorant group were removed with efficiencies higher than 90%. Low removal efficiencies were found for most of the compounds present in the emission showing a significant relation with their chemical properties (functionality and solubility) and operational parameters (temperature, pH and inlet concentration). Interestingly, benzaldehyde and benzyl alcohol were found to be produced in the treatment system. 相似文献
804.
William A. H. Ellis Alistair Melzer Fred B. Bercovitch 《Behavioral ecology and sociobiology》2009,63(8):1181-1188
Animal movement patterns and use of space depend upon food and nonfood resources, as well as conspecific and heterospecific
interactions, but models of habitat use often neglect to examine multiple factors and rarely include marsupials. We studied
habitat use in an Australian population of koalas (Phascolarctos cinereus) over a 6-year period in order to determine how koalas navigate their environment and partition limited patchy food and nonfood
resources. Tree selection among koalas appears to be mediated by folar chemistry, but nonfood tree selection exerts a major
impact on home range use due to thermoregulatory constraints. Koalas moved on a daily basis, during both day and night, but
daytime resting site was not necessarily in the same location as nighttime feeding site. Koalas had substantial home range
overlap in the near absence of resource sharing with less than 1% of trees located in areas of overlap used by multiple koalas.
We suggest that koala spatiotemporal distribution and habitat use are probably based upon a community structure of individuals,
with a checkerboard model best describing overlap in home range area but not in resource use. Nonfood refugia and social networks
should be incorporated into models of animal range and habitat use. 相似文献
805.
806.
Francesco Di Maria Alessio Sordi Caterina Micale 《Waste management (New York, N.Y.)》2013,33(11):2557-2567
The global gaseous emissions produced by landfilling the Mechanically Sorted Organic Fraction (MSOF) with different weeks of Mechanical Biological Treatment (MBT) was evaluated for an existing waste management system. One MBT facility and a landfill with internal combustion engines fuelled by the landfill gas for electrical energy production operate in the waste management system considered. An experimental apparatus was used to simulate 0, 4, 8 and 16 weeks of aerobic stabilization and the consequent biogas potential (Nl/kg) of a large sample of MSOF withdrawn from the full-scale MBT. Stabilization achieved by the waste was evaluated by dynamic oxygen uptake and fermentation tests. Good correlation coefficients (R2), ranging from 0.7668 to 0.9772, were found between oxygen uptake, fermentation and anaerobic test values. On the basis of the results of several anaerobic tests, the methane production rate k (year?1) was evaluated. k ranged from 0.436 to 0.308 year?1 and the bio-methane potential from 37 to 12 N m3/tonne, respectively, for the MSOF with 0 and 16 weeks of treatment. Energy recovery from landfill gas ranged from about 11 to 90 kW h per tonne of disposed MSOF depending on the different scenario investigated. Life cycle analysis showed that the scenario with 0 weeks of pre-treatment has the highest weighted global impact even if opposite results were obtained with respect to the single impact criteria. MSOF pre-treatment periods longer than 4 weeks showed rather negligible variation in the global impact of system emissions. 相似文献
807.
Characteristics, treatment and utilization of residues from municipal waste incineration 总被引:12,自引:0,他引:12
Beneficial utilization of residues from municipal solid waste incineration is an important objective for integrated waste management in many jurisdictions. When residues are to be used as an aggregate substitute in construction applications, the release of constituents of concern to soils and water through leaching is an important environmental consideration. In this paper, residue characteristics that control constituent leaching and testing approaches for evaluating leaching are discussed. Quality control and potential improvement in case of beneficial application are addressed. 相似文献
808.
环境质量综合分析与创新思维 总被引:4,自引:3,他引:1
张宁红 《环境监测管理与技术》2005,17(4):1-3
阐述了创新思维的概念,提出环境质量综合分析应跳出思维定式,学会换位思考,提高成果的针对性;尝试逆向分析,提升信息的流畅性;学会流变思维,提高综合分析的科学性;运用“头脑风暴”,通过无序、有序的思维获取创意,为环境管理与综合决策提供技术支持和技术服务。 相似文献
809.
概括总结了目前涂装(前处理)废水处理工艺,并对这些工艺进行了比较分析,并针对某厂家的涂装废水提出了可行可靠的处理工艺流程。最后提出几点建议来改善和优化涂装废水工艺。 相似文献
810.
Ni-Si交联改性膨润土的制备与应用研究 总被引:1,自引:0,他引:1
以钠基膨润土为原料,制备了镍硅交联改性膨润土,并应用于模拟废水、实验室废水,探讨了镍硅交联改性膨润土对废水中COD、Cr6+、色度、浊度的去除率的影响因素,分别对镍硅交联改性膨润土的镍硅比、废水处理的pH、改性膨润土的投加量、搅拌时间等条件进行了选择。结果令人满意。 相似文献