全文获取类型
收费全文 | 175篇 |
免费 | 1篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 7篇 |
环保管理 | 7篇 |
综合类 | 108篇 |
基础理论 | 23篇 |
污染及防治 | 20篇 |
评价与监测 | 4篇 |
社会与环境 | 5篇 |
出版年
2019年 | 2篇 |
2018年 | 3篇 |
2016年 | 3篇 |
2013年 | 4篇 |
2011年 | 6篇 |
2010年 | 3篇 |
2009年 | 4篇 |
2008年 | 5篇 |
2007年 | 5篇 |
2006年 | 2篇 |
2005年 | 5篇 |
2003年 | 7篇 |
2002年 | 5篇 |
2000年 | 5篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 5篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1986年 | 2篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1974年 | 2篇 |
1969年 | 3篇 |
1967年 | 3篇 |
1965年 | 4篇 |
1964年 | 2篇 |
1963年 | 7篇 |
1962年 | 8篇 |
1961年 | 3篇 |
1960年 | 3篇 |
1959年 | 4篇 |
1958年 | 4篇 |
1957年 | 8篇 |
1956年 | 5篇 |
1954年 | 4篇 |
1950年 | 2篇 |
1940年 | 1篇 |
1939年 | 2篇 |
1938年 | 1篇 |
1934年 | 1篇 |
1932年 | 1篇 |
1924年 | 1篇 |
1920年 | 1篇 |
1919年 | 2篇 |
排序方式: 共有176条查询结果,搜索用时 15 毫秒
71.
72.
Begg Katherine Van der Horst Dan 《Mitigation and Adaptation Strategies for Global Change》2004,9(2):181-200
The European Union EU project PROBASE hasexplored a range of possible multi projectstandardised benchmarks as a way ofencouraging projects under Joint Implementation (JI) and the Clean Development Mechanism (CDM)by minimising transaction costs. The aim ofthis paper is to examine the environmentalintegrity of the use of standardisedbaselines and to explore the role ofadditionality. The environmental integritydepends on the uncertainty in emissionreductions, which was estimated bygenerating scenario baselines and comparingthese with the standardised baselines. Thishas allowed a comparison of selected multiproject baselines with the envelope ofuncertainty on the reductions. The projectsincluded a range of electricity supply,heat sector, cogeneration and methane(CH$_{4}$) projects in different countries. Theanalysis showed that the key uncertaintieswere in the technology fuel selection inthe baseline, the continued additionalityof the project emission reductions,uncertainties in some project emissions(e.g. spinning reserve emissions for wind)and data uncertainties. The effect on theestimation of reductions was in the range±12% to ±46% for the electricityprojects and from ±19% to ±57%for the heat and Combined Heat and Power CHP sector projects.Comparison with the envelope of uncertaintyfor the range of projects showed that multiproject electricity sector baselines whichhave been weighted or use high technologyperformance benchmarks (e.g. Organization for Economic Cooperation and Development OECD)can provide conservative estimates buttheir general nature can lead to variationsbetween countries. We would recommend thatthe country-specific context must be takeninto account so that standardised baselinesfor the electricity sector are generated onthe basis of country specificcharacteristics, the project type, andwhether it provides new or existing demand.The conservative scenario produced shouldthen be weighted. Whereas weightings havebeen applied to account for uncertaintiesor to bias towards renewables, we havesuggested a weighting factor of 25% on theelectricity baseline for large projectsbased on an analysis of the effect ofnon-additionality on emission reductionuncertainty. For heat projects, theappropriate benchmark is a technology/fuelbenchmark which is deemed relevant for theheat sector in that (part of the) country.Again we suggest that a weighted sectorbaseline is required to take account of theuncertainties. These recommendations applyto large projects only for a 10-yearcrediting lifetime. 相似文献
73.
74.
75.
76.
77.
78.
79.
In 1995-1998 the contents of polychlorinated dibenzodioxins and dibenzofurans of 184 pooled fish samples were analysed. Sampling focused on fish and fishery products with a market share of more than 1% and covered all fishing grounds important for the supply of the German market. Investigation included 15 different fish species, shrimp, mussel and squid samples and various fishery products, typically on the German market. Generally lean fish species like cod, saithe or Alaska pollock were less contaminated on fresh weight basis than fat fish species like herring, Greenland halibut and sardine. In herring the dioxin content is related to the fishing ground. Low concentrations were found in North Sea herring, high concentrations measured in samples from the Baltic Sea. Dioxin contents in fishery products did not differ significantly from the raw fish samples. Results allow an estimation of the daily intake of dioxins and furans via fish consumption in Germany. Based on a daily fish consumption of 20 g the average intake of dioxins via fish is 6.2 pg WHO-PCDD/F-TEQs per person and day. 相似文献
80.
Horst Wachs 《Die Naturwissenschaften》1924,12(51):1189-1194