全文获取类型
收费全文 | 187篇 |
免费 | 1篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 5篇 |
环保管理 | 13篇 |
综合类 | 76篇 |
基础理论 | 33篇 |
污染及防治 | 46篇 |
评价与监测 | 10篇 |
社会与环境 | 5篇 |
灾害及防治 | 1篇 |
出版年
2018年 | 7篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 11篇 |
2012年 | 4篇 |
2011年 | 10篇 |
2009年 | 4篇 |
2008年 | 6篇 |
2007年 | 8篇 |
2006年 | 12篇 |
2005年 | 13篇 |
2004年 | 3篇 |
2003年 | 6篇 |
2002年 | 4篇 |
2001年 | 7篇 |
2000年 | 2篇 |
1998年 | 3篇 |
1985年 | 3篇 |
1981年 | 2篇 |
1976年 | 2篇 |
1972年 | 2篇 |
1970年 | 2篇 |
1969年 | 3篇 |
1967年 | 3篇 |
1966年 | 3篇 |
1964年 | 2篇 |
1960年 | 2篇 |
1958年 | 3篇 |
1957年 | 3篇 |
1956年 | 5篇 |
1955年 | 2篇 |
1953年 | 1篇 |
1952年 | 2篇 |
1941年 | 2篇 |
1939年 | 2篇 |
1937年 | 1篇 |
1936年 | 1篇 |
1935年 | 1篇 |
1932年 | 1篇 |
1928年 | 1篇 |
1925年 | 1篇 |
1924年 | 2篇 |
1923年 | 2篇 |
1921年 | 3篇 |
1920年 | 2篇 |
1918年 | 1篇 |
1917年 | 1篇 |
1916年 | 1篇 |
排序方式: 共有190条查询结果,搜索用时 15 毫秒
171.
172.
173.
This paper presents results of the assessment of the design parameters leading to the definition of the crest level of a coastal
dike along the German North Sea. Procedures to estimate the design water level have been proposed, distinguishing between
comparative and single value procedures. The transformation of the wave characteristics from deep water towards the shallow
foreshore was achieved through the application of a spectral wave model. To improve the wave parameter estimations, the existing
model was nested to a grid with a higher resolution closer to the coast. The estimation of the wave run-up followed the Dutch
procedure with some adjustments to the local wave characteristics and dike geometry. The computed maximum crest level of 8.4 m
is below the crest height of the existing dike, which is 8.8 m. However a proposal for a more economical design should be
carefully evaluated, paying attention to the uncertainties encountered in this research. The general recommendation is to
enhance the reliability of the hindcasted wave parameters through calibration and validation of the wave model and to include
in the design process an investigation of the effect of the medium term morphological developments. 相似文献
174.
A field experiment was carried out to determine the effect of different land use systems such as continuous grass and agricultural crops rotation on the bioavailability of heavy metals in soils contaminated by former excessive sewage sludge application. The results show that Cd and Zn concentrations increased to 2 and 3.5 folds within 3 cuts of grass, respectively. Even 10 years after the end of excessive sewage sludge application the concentration of Cd in winter and summer wheat is 3.4 and 2.5 folds higher than the control, respectively. Zn concentration increased by two folds for both crops. In conclusion, the uptake depends on plant species and the degree of soil contamination. The availability of heavy metals was not changed with time. 相似文献
175.
B. Schulz 《Die Naturwissenschaften》1928,16(33):659-660
176.
177.
178.
André Sceia Juan-Carlos Altamirano-Cabrera Laurent Drouet Thorsten F. Schulz Marc Vielle 《Environmental Modeling and Assessment》2012,17(3):193-207
The residential sector presents a great potential for greenhouse gases (GHG) mitigation. We perform an integrated assessment
of different mitigation policies for Switzerland focusing on the residential sector. We analyze the case of pure incentive
taxes and technical regulations. For our analysis, we have coupled a general equilibrium model with a Swiss residential energy
model. We find that a progressive GHG tax of more than 200 USD2000/tCO2 eq is necessary to reach a target of 50% reduction of GHG emissions in 2050. Finally, we also find that efficiency-based
technical regulations provide limited additional abatement incentives. 相似文献
179.
R Schulz 《Chemosphere》2001,45(4-5):543-551
Spray drift and edge-of-field runoff are regarded as important routes of nonpoint-source pesticide input into aquatic surface waters, with current regulatory risk assessment in Europe focussing largely on spray drift. However, the two routes of entry had rarely been compared directly in the same catchment. To this end, the concentrations and loads of the current-use insecticides azinphos-methyl (AZP) and endosulfan (END) were monitored in the Lourens River, South Africa downstream of a 400-ha fruit orchard area during normal farming practice. Spray drift-related peak pesticide levels in the tributaries were in the range of 95th-percentiles of standard drift values according to regulatory risk assessment procedures. Resulting concentrations in Lourens River water samples (n = 3) at a discharge of 0.28 m3/s were as high as 0.04 +/- 0.01 microg/l AZP and 0.07 +/- 0.02 microg/l END. Pesticide levels at the same site during runoff following 3 storm events varying in rainfall between 6.8 and 18.4 mm/d (discharge: 7.5-22.4 m3/s) were considerably higher: by factors between 6 and 37 for AZP (0.26-1.5 microg/l) and between 2 and 41 for END (0.13-2.9 microg/l). Levels of pesticides associated with suspended particles were increased during runoff only up to 1247 microg/kg AZP and 12082 microg/kg END. A possible reason for the relative importance of runoff is that runoff largely integrates potential pesticide input over both time and space, because the prerequisites for the occurrence of runoff in terms of application and plot characteristics as well as meteorological conditions are far less specific than for spray drift. A probability analysis based on pesticide application patterns and 10-yr rainfall data indicates that the frequencies of rainfall events > or = 10 and > or = 15 mm/d are 3.4 and 1.7 per spraying season, respectively. 相似文献
180.