全文获取类型
收费全文 | 161篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 6篇 |
环保管理 | 7篇 |
综合类 | 39篇 |
基础理论 | 44篇 |
污染及防治 | 46篇 |
评价与监测 | 12篇 |
社会与环境 | 6篇 |
出版年
2023年 | 1篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 4篇 |
2017年 | 3篇 |
2016年 | 2篇 |
2015年 | 1篇 |
2014年 | 12篇 |
2013年 | 7篇 |
2012年 | 4篇 |
2011年 | 8篇 |
2010年 | 7篇 |
2009年 | 3篇 |
2008年 | 9篇 |
2007年 | 8篇 |
2006年 | 14篇 |
2005年 | 10篇 |
2004年 | 3篇 |
2003年 | 6篇 |
2002年 | 9篇 |
2001年 | 7篇 |
2000年 | 3篇 |
1999年 | 8篇 |
1998年 | 6篇 |
1997年 | 3篇 |
1995年 | 5篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1991年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1968年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有162条查询结果,搜索用时 343 毫秒
141.
Uwe Buczko Michael van Laak Bettina Eichler-Löbermann Wolfgang Gans Ines Merbach Kerstin Panten Edgar Peiter Thomas Reitz Heide Spiegel Sabine von Tucher 《Ambio》2018,47(1):50-61
Phosphorus (P) fertilizer recommendations in most European countries are based on plant-available soil P contents and long-term field experiments. Site-specific conditions are often neglected, resulting in excessive P fertilizer applications. P fertilization experiments including relevant site and soil parameters were evaluated in order to analyze the yield response. The database comprises about 2000 datasets from 30 field experiments from Germany and Austria. Statistical evaluations using a classification and regression tree approach, and multiple linear regression analysis indicate that besides plant-available soil P content, soil texture and soil organic matter content have a large influence on the effectiveness of P fertilization. This study methodology can be a basis for modification and specification of existing P fertilization recommendations and thus contribute to mitigate environmental impacts of P fertilization. 相似文献
142.
Robert Preusche Sibylle Böhlmann Holger Ecke Uwe Gampe 《International Journal of Greenhouse Gas Control》2011
Air leakages compromise the CO2 capture rate and auxiliary power consumption of oxyfuel power plants. Constructive measures can significantly improve the leakage rate in newly built plants. However, the mitigation of increasing leakage rates during the plant lifetime is crucial for high plant efficiency. In this paper, we apply three statistical methods on experimental process data gathered in an air leakage test in Vattenfall's Oxyfuel Pilot Plant in Schwarze Pumpe, Germany. The performance of the methods in identifying increasing leakage rates and localizing the leakage source is investigated. It was found that all three methods can identify and localize even small increases of the leakage rate. A combination of all three methods allows taking advantage of the individual features of each method. Additional installation of CO2, O2, H2O, and SO2 measurements in the oxidizer can considerably enhance localization performance. Finally, it is shown that the results can be transferred to commercial-scale oxyfuel pilot plants by generating training data with thermodynamic plant models. 相似文献
143.
Yu Y Schleicher N Norra S Fricker M Dietze V Kaminski U Cen K Stüben D 《Journal of environmental monitoring : JEM》2011,13(2):334-346
Systematic sampling and analysis were performed to investigate the dynamics and the origin of suspended particulate matter smaller than 2.5 μm in diameter (PM(2.5)), in Beijing, China from 2005 to 2008. Identifying the source of PM(2.5) was the main goal of this project, which was funded by the German Research Foundation (DFG). The concentrations of 19 elements, black carbon (BC) and the total mass in 158 weekly PM(2.5) samples were measured. The statistical evaluation of the data from factor analysis (FA) identifies four main sources responsible for PM(2.5) in Beijing: (1) a combination of long-range transport geogenic soil particles, geogenic-like particles from construction sites and the anthropogenic emissions from steel factories; (2) road traffic, industry emissions and domestic heating; (3) local re-suspended soil particles; (4) re-suspended particles from refuse disposal/landfills and uncontrolled dumped waste. Special attention has been paid to seven high concentration "episodes", which were further analyzed by FA, enrichment factor analysis (EF), elemental signatures and backward-trajectory analysis. These results suggest that long-range transport soil particles contribute much to the high concentration of PM(2.5) during dust days. This is supported by mineral analysis which showed a clear imprint of component in PM(2.5). Furthermore, the ratios of Mg/Al have been proved to be a good signature to trace back different source areas. The Pb/Ti ratio allows the distinction between periods of predominant anthropogenic and geogenic sources during high concentration episodes. Backward-trajectory analysis clearly shows the origins of these episodes, which partly corroborate the FA and EF results. This study is only a small contribution to the understanding of the meteorological and source driven dynamics of PM(2.5) concentrations. 相似文献
144.
Kerstin?JantkeEmail author Uwe?A.?Schneider 《Environmental Modeling and Assessment》2011,16(3):227-238
Nature reserves are often designated ad hoc. Despite increasing conservation efforts, loss of biodiversity is still accelerating.
Considering land scarcity and demand for alternative uses, efficiency in conservation strongly correlates with efficiency
in land allocation. Systematic conservation planning can effectively prioritize conservation activities. Previous studies
minimize opportunity costs for given conservation targets. However, these studies assume constant marginal costs of habitat
protection. We extend this cost minimization approach by also considering a dynamic representation of marginal costs. The
more land is allocated to nature reserves, the higher are opportunity costs, i.e., costs of forgone agricultural production.
This increase in costs results from changes in the prices of agricultural commodities. We employ a deterministic, spatially
explicit mathematical optimization model to allocate species habitats by minimizing opportunity costs for setting aside land
for conservation purposes. The model is designed as a mixed integer programming problem and solved with GAMS/CPLEX. Our results
show the need for integrating land market feedbacks into conservation planning. We find that ignoring land rent adjustments
can lead to highly cost-ineffective solutions in reserve selection. 相似文献
145.
Alberto Pistocchi Jan Groenwold Joost Lahr Mark Loos Marelys Mujica Ad M. J. Ragas Robert Rallo Serenella Sala Uwe Schlink Kathrin Strebel Marco Vighi Pilar Vizcaino 《Environmental Modeling and Assessment》2011,16(2):119-133
We present examples of cumulative chemical risk mapping methods developed within the NoMiracle project. The different examples illustrate the application of the concentration addition (CA) approach to pesticides at different scale, the integration in space of cumulative risks to individual organisms under the CA assumption, and two techniques to (1) integrate risks using data-driven, parametric statistical methods, and (2) cluster together areas with similar occurrence of different risk factors, respectively. The examples are used to discuss some general issues, particularly on the conventional nature of cumulative risk maps, and may provide some suggestions for the practice of cumulative risk mapping. 相似文献
146.
Christina Jarke Anja Petereit Karsten Fehlhaber Peggy G. Braun Uwe Truyen Thiemo Albert 《Food and environmental virology》2013,5(3):135-143
Until now, little is known about the influence of food additives on heat inactivation of noroviruses. Only a few studies have shown a protective or inhibiting effect on virus infectivity caused by the food matrix. Therefore, the aim of this study was to examine the influence of sodium chloride, sucrose and milk on heat stability of the surrogates murine norovirus (MNV) and MS2 phage at 60 °C for 1–5 min in PBS for MNV and for 5–120 min in suspension medium buffer for MS2 phage. Different concentrations of sodium chloride (5, 10 %) and sucrose (5, 50 %) were added to the respective buffers. In addition, commercially available milk with different fat concentrations (0.3, 1.5, 3.5 %) was investigated in this study. In general, a linear titre reduction for MNV and MS2 phage could be observed, except for the heat treatment of MNV in PBS with 50 % sucrose. A protective effect of PBS with 50 % sucrose and of the matrix milk on MNV could be concluded. All other tested conditions did not show any influence on virus inactivation. However, MS2 phage did show a higher heat resistance throughout the experiments compared to MNV. In future investigations, it should be tested, whether the achieved data may be considered in risk assessments of heat-treated food products with high concentrations of sugar. Furthermore, it should be clarified, whether these results can also be referred to complex food matrices. 相似文献
147.
148.
149.
150.
Kinetics of ammonium removal with suspended and immobilized nitrifying bacteria in different reactor systems 总被引:4,自引:0,他引:4
The degradation of ammonium by free and immobilized bacteria in different reactor systems was investigated. It was found that the start-up of a nitrifying system is enhanced if a reservoir of immobilized bacteria is present. It was also found that in a single stage system with suspended nitrifying bacteria a stable ammonium removal > 95 % could be established up to an influent ammonium concentration of 1000 mg/1 and a volumetric loading rate (VLR) of 2.3 kg NH4+ m−3 d−1. The oxygen uptake rate (OUR) due to nitrification processes was greatly enhanced with increasing volumetric loading rates. Using nitrifying bacteria immobilized on Siran material it was demonstrated that the ammonium degradation rate was directly proportional to the initial ammonium concentration. 相似文献