全文获取类型
收费全文 | 145篇 |
免费 | 3篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 4篇 |
废物处理 | 4篇 |
环保管理 | 28篇 |
综合类 | 22篇 |
基础理论 | 32篇 |
污染及防治 | 42篇 |
评价与监测 | 9篇 |
社会与环境 | 6篇 |
灾害及防治 | 4篇 |
出版年
2021年 | 2篇 |
2020年 | 1篇 |
2018年 | 3篇 |
2017年 | 5篇 |
2016年 | 3篇 |
2015年 | 6篇 |
2014年 | 5篇 |
2013年 | 11篇 |
2012年 | 7篇 |
2011年 | 5篇 |
2010年 | 5篇 |
2009年 | 5篇 |
2008年 | 4篇 |
2007年 | 10篇 |
2006年 | 11篇 |
2005年 | 8篇 |
2004年 | 8篇 |
2003年 | 6篇 |
2002年 | 5篇 |
2001年 | 7篇 |
2000年 | 5篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1971年 | 2篇 |
1970年 | 2篇 |
1960年 | 1篇 |
排序方式: 共有151条查询结果,搜索用时 15 毫秒
91.
The authors simulate an econometric model of the world copper industry together with a financial model of a stabilization agency to evaluate the financial profitability of stabilization under alternative regimes. In particular the effects of varying the stabilization bandwidth and the initial metal endowment of the agency are examined. A major finding is that a stockpile facility considerably in excess of that proposed by UNCTAD would be required to give adequate stabilization. 相似文献
92.
Although audit programs have helped companies make big improvements in performance, more progress is still necessary and available. In this article the authors show how still bigger improvements are possible by expanding the corrective action process and utilizing total quality principles in developing corrective actions and evaluating company performance. With sufficient knowledge about the nature of its problems, not just the degree of its problems, a company should be able to rethink its basic management approaches and achieve dramatic improvements in performance. 相似文献
93.
Gilbert Gude 《The Environmentalist》1984,4(1):47-50
Summary When people are in government, they are always involved in some type of information communication, but for more than five
years now I have been involved with the Congressional Research Service, CRS, an institution which is totally committed to
research and transfer of information to the United States Congress. The Congressional Research Service works exclusively for
congress—for al the members and all the committees; and CRS’s scope—information, reference and research—covers all subject
areas, including environmental issues, which are of congressional interest. The inquiries from members and staff—by phone,
letter or in person—exceed 400 000 a year, and the number of requests has increased at an average rate of almost 9 percent
each year over the past decade. Small wonder the service employs about 825 people, 550 of whom are professionals.
Gilbert Gude is Director of the Congressional Research Service of the Library of Congress, appointed by Librarian Daniel J.
Boorstin in January 1977. Mr Gude’s career in public service began in 1953 when he was elected to the Maryland House of Delegates;
he served as a Member of the Maryland State Senate from 1962–1966, before being elected to the US House of Representatives
for the 8th District of Maryland in 1967. During his 10-year career in the House he served as ranking member of the Subcommittee
on Conservation, Energy and Natural Resources of the Government Operations Committee and ranking member of the Committee on
the District of Columbia; he was also a member of the Select Committee on Aging. Mr Gude’s legislative work concentrated in
the areas of urban and regional affairs and environmental issues. He was a key sponsor of the bill creating the C&O Canal
National Historical Park and developed a number of legislative initiatives involving the Potomac River. Mr Gude is Vice Chairman
of the Board of Trustees of The Catholic University of America and a member of the National Academy of Public Administration.
He is a former member of Members of Congress for Peace Through Law and former chairman of the 1976 Anglo-American Conference
on Africa. Mr Gude received a B.S. from Cornell University in 1948 and an M.A. in public administration from George Washington
University in 1958. 相似文献
94.
INTRODUCTION: With many thousands of deaths still annually attributable to driving under the influence (DUI), it remains imperative that we continually address the problem of producing and sustaining effective countermeasures, and that we subject these efforts to empirical scrutiny. This article presents relevant findings from state-wide datasets. RESULTS: A formula generating a potentially useful metric for assessing aspects of the DUI prosecutorial chain is presented, focusing on the rate of proactive DUI arrests. While in need of cautious interpretation due to issues of inherent inaccuracies in large databases, small numbers of crashes and/or arrests in multiple jurisdictions, and the lack of replication in other states, the analyses show no relationship between the level of DUI arrest activity and DUI-related crashes. This finding brings into question the efficacy of the many millions of dollars devoted each year to targeted DUI enforcement, as it is currently being implemented. CONCLUSIONS: Results are discussed in terms of developing adequate disincentives to DUI so as to raise general deterrence via dramatic increases in proactive DUI enforcement and then engaging in pervasive and persistent social marketing of such efforts to maximize the perception that arrest and punishment for DUI is always imminent, that penalties will be swift, certain, and severe. It is echoed that accurate data need to be collected at all levels of the DUI arrest and prosecution process in every jurisdiction within a state, so as to facilitate the empirical assessment of countermeasure efficacy in reducing alcohol-related crashes. IMPACT ON INDUSTRY: Given that this work needs to be replicated, the impact on the traffic safety industry is potentially huge. The present data indicate that law enforcement efforts to further abate DUI-related crashes are apparently ineffective, though likely necessary to maintain reductions achieved in the 80s and early 90s. Thus, to attain additional systematic reductions, a dramatic increase in enforcement will be necessary as will a diversification of abatement efforts, including an increase in aggressive social marketing tactics to positively impact our traffic safety culture by making DUI universally unacceptable (for a discussion of this latter issue and on the use of positive reinforcement to change driver behavior, see Dula & Geller, 2007). 相似文献
95.
In a longitudinal study of laid-off industrial workers, we examined the effects of individual differences and situational characteristics on individuals' use of six job loss coping strategies. In each case the predictors explained a significant portion of the variance (30–47 percent) although different predictors were significantly associated with each of the six coping strategies. The results also suggest that the use of problem-focused and symptom-focused coping strategies are complementary rather than mutually exclusive. The study's implications and directions for future research are discussed as well. © 1998 John Wiley & Sons, Ltd. 相似文献
96.
Battle?Karimi Pierre?Alain?Maron Nicolas?Chemidlin-Prevost Boure Nadine?Bernard Daniel?Gilbert Lionel?RanjardEmail author 《Environmental Chemistry Letters》2017,15(2):265-281
Evaluating the quality of ecosystems in terms of biological patrimony and functioning is of critical importance in the actual context of intensified human activities. Microbial diversity is commonly used as a bioindicator of ecosystems functioning. However, there is a lack of sensitivity of microbial diversity indicators in the case of moderate and chronic environmental degradation, such as atmospheric deposition of pollutants, agricultural practices, diffuse pollution by wastewater and climate change. As a consequence, there is a need for alternative bioindicators of soils and water quality. Here, we discuss the interest of adopting a more integrative approach based on biotic interaction networks beyond the simple diversity indicators. We review how the various biotic interactions can be integrated in the various microbial networks such as trophic, mutualistic and co-occurrence networks. Then we discuss the efficiency of microbial networks and associated metrics to detect changes in microbial communities. We conclude that the connectance, the number of links and the average degree of co-occurrence networks could vary from 10 to 50% in response to minor perturbations when microbial diversity parameters remain stable. Finally, we analyze studies that aimed at linking microbial networks and activity to evaluate the potential of such networks for providing simple and operational indicators of ecosystem quality and functioning. 相似文献
97.
Largely influenced by the passage of the Swamp Land Act of 1849, many wetlands were lost in the coastal plain region of the southeastern United States, primarily as a result of drainage for agricultural activities. To better understand the chemical response of soils during wetland conversion, soil core samples were collected from the converted beef cattle pastures and from the natural wetland at Plant City, FL in the summers of 2002 and 2003. Data collected from the natural wetland sites were used as reference data to detect potential changes in soil properties associated with the conversion of wetlands to improved beef cattle (Bos taurus) pastures from 1940 to 2003. The average concentration of total phosphorus (TP) in pasture soils (284 mg kg(-1)) was significantly (p = 0.001) lower than its levels in natural wetland soils (688 mg kg(-1)). Compared with the adjoining natural wetlands, the beef cattle pasture soils, 63 yr after being drained exhibited: (1) a decrease in TOC (-172 g kg(-1)), TN (-10 g kg(-1)), K (-0.7 mg kg(-1)), and Al (-130 mg kg(-1)); (2) an increase in soil pH (+1.8), Ca (+88 mg kg(-1)), Mg (+7.5 mg kg(-1)), Mn (+0.3 mg kg(-1)), and Fe (+6.9 mg kg(-1)); and (3) no significant change in Na, Zn, and Cu. Wetland soils had higher concentrations (mg kg(-1)) of Al-P (435), CaMg-P (42), FeMn-P (43), and Org-P (162) than those of 172, 11, 11, and 84 mg kg(-1), respectively, found in the pasture soils. The levels of water-soluble P and KCl-bound P were comparable between wetland and pasture soils in 2003. Results of this study therefore suggest that wetland conversion to beef cattle pastures did not function as a source of nutrients, especially P and N, even with manure and urine additions due to the presence of grazing cattle. 相似文献
98.
Jamal Al Abdullah Hervé Michèl Geneviève Barci Funel Gilbert Féraud 《Environmental monitoring and assessment》2014,186(12):8175-8189
This study reports on the determination of trace element (TE)—Li, As, Co, Cs, Cu, Pb, U, and Zn—and major element (ME)—Si, Al, Fe, Mg, Ca, Mn, Na, and K—concentrations in 18 riverbed sediments and a sediment core from the Var River catchment using inductively coupled plasma mass spectrometry (ICP-MS). The results were compared with those of a reference sediment core, and the contribution of clay and organic carbon contents in the distribution of TE and ME in the sediment samples was investigated. The mean concentrations of the ME were comparable in both core and riverbed samples and were within the natural averages. In the case of TE, the concentrations were lower in riverbed sediment samples than those found in the sediment core. High mean concentration of As was observed (7.6 μg g?1) in both core and riverbed sediments, relatively higher than the worldwide reported values. The obtained data indicated that the natural high level of arsenic might be originated from the parent rocks, especially metamorphic rocks surrounding granites and from Permian sediments. Statistical approach, viz., Pearson correlation matrix, was applied to better understand the correlation among TE in both riverbed and sediment core samples. No significant metallic contamination was detected in the low Var valley despite of the localization of several industrial facilities. Therefore, results confirm that the concentrations of the TE obtained in the riverbed sediments could be considered as a baseline guide for future pollution monitoring program. 相似文献
99.
100.
J. van den Bergh A. Barendregt A. Gilbert M. van Herwijnen P. van Horssen P. Kandelaars C. Lorenz 《Environmental Modeling and Assessment》2001,6(2):87-100
Wetlands provide many important goods and services to human societies, and generate nonuse values as well. Wetlands are also very sensitive ecosystems that are subject to much stress from human activities. Reducing the stress on wetlands requires a spatial matching between physical planning, hydrological and ecological processes, and economic activities. Spatially integrated modelling and evaluation can support this. The present study has developed a triple layer model that integrates information and concepts from social and natural sciences to address the analysis and evaluation of land-use scenarios for a wetlands area in the Netherlands, the Vecht area. This is the floodplain of river Vecht, located in the centre of the Netherlands. The study has resulted in a set of linked spatial hydrological, ecological and economic models, formulated at the level of grids and polders. The main activities incorporated in the system of models are housing, infrastructure, agriculture, recreation and nature conservation. The formulation of alternative development scenarios is dominated by land use and land cover options that are consistent with the stimulation of agriculture, nature or recreation. Two aggregate performance indicators have been constructed from model output, namely net present value of changes and environmental quality. The spatial characteristics of these indicators are retained in a spatial evaluation that ranks scenarios. 相似文献