全文获取类型
收费全文 | 1232篇 |
免费 | 1篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 24篇 |
废物处理 | 25篇 |
环保管理 | 111篇 |
综合类 | 837篇 |
基础理论 | 107篇 |
污染及防治 | 100篇 |
评价与监测 | 24篇 |
社会与环境 | 4篇 |
灾害及防治 | 3篇 |
出版年
2022年 | 11篇 |
2021年 | 9篇 |
2020年 | 5篇 |
2019年 | 8篇 |
2017年 | 11篇 |
2016年 | 18篇 |
2015年 | 16篇 |
2014年 | 19篇 |
2013年 | 61篇 |
2012年 | 10篇 |
2011年 | 11篇 |
2010年 | 14篇 |
2009年 | 19篇 |
2008年 | 24篇 |
2007年 | 16篇 |
2006年 | 12篇 |
2005年 | 12篇 |
2004年 | 11篇 |
2003年 | 20篇 |
2002年 | 14篇 |
1998年 | 13篇 |
1995年 | 56篇 |
1994年 | 52篇 |
1993年 | 38篇 |
1992年 | 35篇 |
1991年 | 28篇 |
1990年 | 32篇 |
1989年 | 27篇 |
1988年 | 37篇 |
1987年 | 30篇 |
1986年 | 25篇 |
1985年 | 15篇 |
1984年 | 13篇 |
1983年 | 14篇 |
1982年 | 10篇 |
1981年 | 4篇 |
1979年 | 5篇 |
1976年 | 6篇 |
1975年 | 9篇 |
1974年 | 4篇 |
1973年 | 10篇 |
1971年 | 4篇 |
1961年 | 4篇 |
1919年 | 47篇 |
1918年 | 44篇 |
1917年 | 36篇 |
1916年 | 53篇 |
1915年 | 37篇 |
1914年 | 71篇 |
1913年 | 106篇 |
排序方式: 共有1235条查询结果,搜索用时 250 毫秒
91.
Conan C Bouraoui F Turpin N de Marsily G Bidoglio G 《Journal of environmental quality》2003,32(6):2026-2032
In the intensive pig-farming (Sus scrofa) area of Brittany (western France), many surface and subsurface water resources are contaminated by nitrate (NO3) with concentrations that chronically exceed the European Community 50 mg L(-1) drinking standard. To ensure sustainable water supply, the fate of NO3 must be considered in both surface water and ground water. The fate of N was investigated in a Britain catchment, the Co?t-Dan watershed, with an integrated management tool: the hydrological SWAT model coupled with the ground water model MODFLOW, and its companion contaminant and solute transport model MT3DMS. The model was validated with respect to water quantity during a 6-yr period and for the NO3 concentration during a 44-mo period, at two gauging stations in the catchment. The coupled models reproduced accurately the measurements. At the basin outlet, the Nash-Sutcliffe coefficients were 0.88 for monthly flow for the entire period and 0.87 for monthly N load. Alternative scenarios were simulated and showed potential benefits of decreasing manure application from 210 to 170 kg N ha(-1) as required by the European Commission Nitrates Directive. 相似文献
92.
Extension of EU Emissions Trading Scheme to Other Sectors and Gases: Consequences for Uncertainty of Total Tradable Amount 总被引:1,自引:0,他引:1
Emissions trading in the European Union (EU), covering the least uncertain emission sources of greenhouse gas emission inventories
(CO2 from combustion and selected industrial processes in large installations), began in 2005. During the first commitment period
of the Kyoto Protocol (2008–2012), the emissions trading between Parties to the Protocol will cover all greenhouse gases (CO2, CH4, N2O, HFCs, PFCs, and SF6) and sectors (energy, industry, agriculture, waste, and selected land-use activities) included in the Protocol. In this paper,
we estimate the uncertainties in different emissions trading schemes based on uncertainties in corresponding inventories.
According to the results, uncertainty in emissions from the EU15 and the EU25 included in the first phase of the EU emissions
trading scheme (2005–2007) is ±3% (at 95% confidence interval relative to the mean value). If the trading were extended to
CH4 and N2O, in addition to CO2, but no new emissions sectors were included, the tradable amount of emissions would increase by only 2% and the uncertainty
in the emissions would range from −4 to +8%. Finally, uncertainty in emissions included in emissions trading under the Kyoto
Protocol was estimated to vary from −6 to +21%. Inclusion of removals from forest-related activities under the Kyoto Protocol
did not notably affect uncertainty, as the volume of these removals is estimated to be small. 相似文献
93.
The future supplies of iron ore, coking coal and ferrous scrap are discussed. There is no likelihood of the resources of iron ore being exhausted until well into the twenty-first century. Coking coal, on the other hand, is in shorter supply but it is being eked out by blending with non-coking coal and by making blast furnaces more efficient. Briquettes made completely from non-coking coal will play a part in iron making in the future. To ensure greater flexibility in steel making, hydrocarbons are being considered as possible substitutes for coal. Scrap has always played an important part in steel making and the amount recycled is increasing every year. But more effort is needed, for example, to ensure that the steel in car scrap is fully utilised and that refuse is efficiently recycled. Steel making increasingly demands the scrap to have few impurities and to be in uniform sized pieces. A cryogenic method of preparing such scrap is described. A futuristic way of extracting iron, non-ferrous metals and other saleeable by-products from refuse, by using redundant blast furnaces, is also discussed. 相似文献
94.
95.
Alberto Pivato Stefano Vanin Luca Palmeri Alberto Barausse Giovanni Mangione Michele Rasera Monego Gianluca 《Waste management (New York, N.Y.)》2013,33(7):1607-1615
The Biopotentiality Index is a landscape ecology indicator, which can be used to estimate the latent energy of a given land and to assess the environmental impacts due to the loss of naturalness on a landscape scale. This indicator has been applied to estimate the effectiveness of the measures put in place to provide an environmental compensation for the revamping of a composting plant. These compensation measures are represented by a green belt with a minimum width of 25 m all around the plant, representing both a windbreak and a buffer zone, and by two wide wooded zones acting as core natural areas.This case-study shows that the compensation index could be used as a key tool in order to negotiate the acceptance of waste treatment plant with the population. 相似文献
96.
97.
Giovanni Bella 《Environmental Modeling and Assessment》2013,18(6):629-638
The model presented in this paper describes an economy with endogenous technical change and polluting production techniques. The main question we want to address is whether the adoption of “dirty” production processes might lead to a sustainable unique steady state, or guarantee the emergence of multiple equilibria. The application of the original Bogdanov–Takens theorem allows us to characterize the regions of the parametric space where the model exhibits either a global indeterminate equilibrium or a poverty-environment trap. 相似文献
98.
Marine Conservation on Paper 总被引:1,自引:0,他引:1
Giovanni Bearzi 《Conservation biology》2007,21(1):1-3
99.
100.
Antonio Bucci Vincenzo Allocca Gino Naclerio Giovanni Capobianco Fabio Divino Francesco Fiorillo Fulvio Celico 《环境科学学报(英文版)》2015,(1):131-138
The aim of the research was to evaluate, at site scale, the influence of freezing and freeze/thaw cycles on the survival of faecal coliforms and faecal enterococci in soil, in a climate change perspective. Before the winter period and during grazing, viable cells of faecal coliforms and faecal enterococci were detected only in the first 10 cm below ground, while,after the winter period and before the new seasonal grazing, a lower number of viable cells of both faecal indicators was detected only in some of the investigated soil profiles, and within the first 5 cm. Taking into consideration the results of specific investigations, we hypothesise that the non-uniform spatial distribution of grass roots within the studied soil can play an important role in influencing this phenomenon, while several abiotic factors do not play any significant role. Taking into account the local trend in the increase of air temperature, a different distribution of microbial pollution over time is expected in spring waters, in future climate scenarios. The progressive increase in air temperature will cause a progressive decrease in freeze/thaw cycles at higher altitudes, minimising cold shocks on microbial cells, and causing spring water pollution also during winter. 相似文献