全文获取类型
收费全文 | 227篇 |
免费 | 15篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 18篇 |
废物处理 | 17篇 |
环保管理 | 76篇 |
综合类 | 29篇 |
基础理论 | 54篇 |
污染及防治 | 21篇 |
评价与监测 | 17篇 |
社会与环境 | 8篇 |
灾害及防治 | 3篇 |
出版年
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 6篇 |
2019年 | 6篇 |
2018年 | 4篇 |
2017年 | 11篇 |
2016年 | 13篇 |
2015年 | 11篇 |
2014年 | 2篇 |
2013年 | 14篇 |
2012年 | 13篇 |
2011年 | 12篇 |
2010年 | 4篇 |
2009年 | 15篇 |
2008年 | 10篇 |
2007年 | 10篇 |
2006年 | 13篇 |
2005年 | 14篇 |
2004年 | 14篇 |
2003年 | 13篇 |
2002年 | 8篇 |
2001年 | 11篇 |
2000年 | 7篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 4篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1979年 | 1篇 |
1973年 | 1篇 |
1963年 | 1篇 |
排序方式: 共有243条查询结果,搜索用时 15 毫秒
151.
152.
Atmospheric carbon dioxide (CO2) has increased from a preindustrial concentration of about 280 ppm to about 367 ppm at present. The increase has closely
followed the increase in CO2 emissions from the use of fossil fuels. Global warming caused by increasing amounts of greenhouse gases in the atmosphere
is the major environmental challenge for the 21st century. Reducing worldwide emissions of CO2 requires multiple mitigation pathways, including reductions in energy consumption, more efficient use of available energy,
the application of renewable energy sources, and sequestration. Sequestration is a major tool for managing carbon emissions.
In a majority of cases CO2 is viewed as waste to be disposed; however, with advanced technology, carbon sequestration can become a value-added proposition.
There are a number of potential opportunities that render sequestration economically viable. In this study, we review these
most economically promising opportunities and pathways of carbon sequestration, including reforestation, best agricultural
production, housing and furniture, enhanced oil recovery, coalbed methane (CBM), and CO2 hydrates. Many of these terrestrial and geological sequestration opportunities are expected to provide a direct economic
benefit over that obtained by merely reducing the atmospheric CO2 loading. Sequestration opportunities in 11 states of the Southeast and South Central United States are discussed. Among the
most promising methods for the region include reforestation and CBM. The annual forest carbon sink in this region is estimated
to be 76 Tg C/year, which would amount to an expenditure of $11.1–13.9 billion/year. Best management practices could enhance
carbon sequestration by 53.9 Tg C/year, accounting for 9.3% of current total annual regional greenhouse gas emission in the
next 20 years. Annual carbon storage in housing, furniture, and other wood products in 1998 was estimated to be 13.9 Tg C
in the region. Other sequestration options, including the direct injection of CO2 in deep saline aquifers, mineralization, and biomineralization, are not expected to lead to direct economic gain. More detailed
studies are needed for assessing the ultimate changes to the environment and the associated indirect cost savings for carbon
sequestration. 相似文献
153.
Dr Anjan Kumer Dev Roy Jeff Gow 《Journal of Environmental Planning and Management》2015,58(2):213-228
This paper examines the challenges of achieving sustainable management of the world's largest mangrove forest, the Sundarbans (SMF) in Bangladesh. During the past two decades, conflicts between mangrove maintenance and the pressure to provide economic livelihoods to forest-dependent communities (FDCs) have emerged and persisted. The SMF is currently managed by the Bangladesh Forest Department (BFD) under a state property rights regime. This study explores an alternative property rights regime which includes participatory approaches and co-management with FDCs to achieve sustainability, both economically and environmentally. Focus group discussions and a survey were the methods used to assess the prospects. The study finds that the absence of a management partnership between the BFD and FDCs is mainly responsible for the policy failures to achieve sustainable management of the SMF. However, evidence is presented that a ‘co-management’ property rights regime cannot be established until FDC capacity is enhanced through the formation of community level institutions. 相似文献
154.
Darla Hatton MacDonald Mary Barnes Jeff Bennett Mark Morrison Michael D. Young 《Journal of the American Water Resources Association》2005,41(3):719-728
ABSTRACT: A series of reforms in the water industry in Australia has created a demand from the industry and regulators for objective methodologies to evaluate incremental changes in the customer service standards. In this paper, the use of choice modeling for estimating implicit prices associated with urban water supply attributes is explored. Results from multinomial logit (MNL) and random parameters logit (RPL) models show that increases in annual water bills and the frequency of future interruptions were the most important attributes. Implicit price confidence intervals based on the best models suggest that people are willing to pay positive amounts to achieve a water supply that is less frequently interrupted. The provision of alternative water supplies during an interruption and notification of the interruption were found to be unimportant to respondents. Choice modeling proved to be a useful technique and provided the industry and regulators with additional information for standard setting. 相似文献
155.
Dora Sheau‐Yun Chiang Everett W. Glover Jeff Peterman Joseph Harrigan Bill DiGuiseppi David S. Woodward 《补救:环境净化治理成本、技术与工艺杂志》2008,19(1):19-37
1,4‐Dioxane entered the environment as a result of historic leaks and spills in the production area at an industrial facility in the southeastern coastal plain. The areal extent of the 1,4‐dioxane plume is several hundred acres and is largely contained on the site. Land use adjacent to the plant property is primarily undeveloped (wetlands or woods) or industrial, with a small area of mixed land use (commercial/residential) to the southwest and north. The surficial aquifer is a relatively simple hydrogeologic system with well‐defined boundaries and is comprised of a 50‐ to 70‐foot‐thick deposit of alluvial/fluvial sand and gravel that overlies an aquitard in excess of 100 feet thick. A groundwater flow model, developed and calibrated using field‐measured data, was used for the fate‐and‐transport modeling of 1,4‐dioxane. The flow‐and‐transport model, combined with the evaluation of other site geochemical data, was used to support the selection of monitored natural attenuation (MNA) as the proposed groundwater remedy for the site. Since the active sources of contamination have been removed and the modeling/field data demonstrated that the plume was stable and not expanding, the proposed MNA approach was accepted and approved by the regulatory agency for implementation in 2004. Subsequent accumulated data confirm that concentrations in the 1,4‐dioxane plume are declining as predicted by the fate‐and‐transport modeling. © 2008 Wiley Periodicals, Inc. 相似文献
156.
Neil LeBlanc Réjean Tremblay Jeff Davidson Thomas Landry Mary McNiven 《Marine Biology》2008,153(6):1141-1152
This study examined the effects of two selection treatments (elevated water temperature and air exposure) on the genetic and
physiological characteristics of the juvenile marine mussel, Mytilus edulis (<10 mm). Genetic effects were measured on five allozymes and fitness assessed using physiological tests to estimate energy
balance (scope for growth) as well as size, growth and survival. The in vitro treatments resulted in 48% mortality from an
air exposure of 11 h at 27°C and 76% mortality from a 6-h exposure to 33°C water. Survivors (n = 1,152) of each treatment along with controls (n = 2,304) were measured and randomly placed in compartmentalized cages. Mussels were deployed to three bays in Prince Edward
Island, Canada and monitored over a 10-month period. Initially, both of the treatments had an effect on mussel size and increased
the heterozygosity of the surviving mussels. Physiological analyses after 3 months in the field showed that the two treated
mussels showed lower metabolic rate that the control group. After 10 months in the field, the treated mussels were larger
and had lower mortality than the untreated control mussels. Unexplained environmental interaction in each of the bays had
an effect on allelic frequencies and heterozygosity. Overall, the results demonstrate that simple husbandry techniques can
be used to increase the productivity of mussel seed and heterozygosity measures can be used to assess fitness. However, more
field data is needed to determine the consistency of the increased productivity and if the increased productivity justifies
the costs of a selective treatment. Furthermore, because the level of heterozygosity in juvenile mussel populations can vary
considerably, both spatially and temporally, it may be effective as a warning of future natural mass mortality when overall
heterozygosity levels are found to be low. 相似文献
157.
Gajanan Bhat John Bergstrom R. Jeff Teasley J. M. Bowker H. Ken Cordell 《Environmental management》1998,22(1):69-77
/ This paper describes a framework for estimating the economic value of outdoor recreation across different ecoregions. Ten ecoregions in the continental United States were defined based on similarly functioning ecosystem characters. The individual travel cost method was employed to estimate recreation demand functions for activities such as motor boating and waterskiing, developed and primitive camping, coldwater fishing, sightseeing and pleasure driving, and big game hunting for each ecoregion. While our ecoregional approach differs conceptually from previous work, our results appear consistent with the previous travel cost method valuation studies.KEY WORDS: Recreation; Ecoregion; Travel cost method; Truncated Poisson model 相似文献
158.
Kai Li Hui Chen Yajuan Wang Zhihua Shan Jeff Yang Patrick Brutto 《Journal of Cleaner Production》2009,17(17):1603-1606
During the last few decades new materials and technologies have being studied and applied in order to reduce the ecological impact of leather production. Severe restrictions imposed by the pollution control authorities on the disposal of chromium, total dissolved solids and chlorides in tannery effluents have forced the tanners and researchers to look for eco-benign pickling and tanning processes. In this study, we would focus on the novel process development of pickling with the presence of oxazolidine based product. Investigations indicated that oxazolidine is a potential material to replace neutral salts in pickling and, realize high chrome exhaustion in the subsequential chrome tanning. 相似文献
159.
Patricia A. Fair Hing-Biu Lee Jeff Adams Colin Darling Grazina Pacepavicius Mehran Alaee Gregory D. Bossart Natasha Henry Derek Muir 《Environmental pollution (Barking, Essex : 1987)》2009,157(8-9):2248-2254
The presence of triclosan, a widely-used antibacterial chemical, is currently unknown in higher trophic-level species such as marine mammals. Blood plasma collected from wild bottlenose dolphins (Tursiops truncatus) in Charleston, SC (CHS) (n = 13) and Indian River Lagoon, FL (IRL) (n = 13) in 2005 was analyzed for triclosan. Plasma concentrations in CHS dolphins ranged from 0.12 to 0.27 ng/g wet weight (mean 0.18 ng/g), with 31% of the sampled individuals having detectable triclosan. The mean IRL dolphin plasma concentrations were 0.072 ng/g wet weight (range 0.025–0.11 ng/g); 23% of the samples having detectable triclosan. In the CHS area, triclosan effluent values from two WWTP were both 190 ng/L and primary influents were 2800 ng/L and 3400 ng/L. Triclosan values in CHS estuarine surface water samples averaged 7.5 ng/L (n = 18) ranging from 4.9 to 14 ng/L. This is the first study to report bioaccumulation of anthropogenic triclosan in a marine mammal highlighting the need for further monitoring and assessment. 相似文献
160.