全文获取类型
收费全文 | 164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 | 42篇 |
基础理论 | 41篇 |
污染及防治 | 47篇 |
评价与监测 | 14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 | 6篇 |
2012年 | 4篇 |
2011年 | 9篇 |
2010年 | 7篇 |
2009年 | 3篇 |
2008年 | 8篇 |
2007年 | 8篇 |
2006年 | 14篇 |
2005年 | 10篇 |
2004年 | 3篇 |
2003年 | 8篇 |
2002年 | 8篇 |
2001年 | 7篇 |
2000年 | 3篇 |
1999年 | 9篇 |
1998年 | 6篇 |
1997年 | 3篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1981年 | 1篇 |
1968年 | 1篇 |
1966年 | 2篇 |
1965年 | 1篇 |
1958年 | 1篇 |
1915年 | 1篇 |
排序方式: 共有165条查询结果,搜索用时 0 毫秒
161.
Luca Geranio Gregor Hommes Patrick Shahgaldian Amina Wirth-Heller Uwe Pieles Philippe F.-X. Corvini 《Environmental Chemistry Letters》2010,8(3):247-251
A new and efficient synthetic route to fluorescent and 14C-double-labeled silica-based nanoparticles (NPs) is described. The synthesis has been carried out using the “oil-in-water”
micro-emulsion technique. Fluorescent and radioactive labeling have been achieved entrapping labeled poly(ethylene glycol)
(PEG) molecules in the NPs. The produced particles have been analyzed by means of scanning electron microscopy, photon correlation
spectroscopy, confocal microscopy, scintillation counting and oxidation/combustion experiments. Fluorescence quenching experiments
confirm that the label is entrapped in the particles. The results presented suggest that the silica matrix does not block
the β-radiations emitted from the labeled PEG molecules entrapped in the NPs. 相似文献
162.
The appropriate prediction of the fate of the contaminant is an essential step when evaluating the risk of severe groundwater pollutions-in particular in the context of natural attenuation. We numerically study the reactive transport of phenanthrene at the field scale in a multilayer soil profile based on experimental data. The effect of carrier facilitation by dissolved organic carbon is emphasized and incorporated in the model. Previously published simulations are restricted to the saturated zone and/or to homogeneous soil columns at the laboratory scale. A numerical flow and transport model is extended and applied to understand and quantify the relevant processes in the case of a strongly sorbing hydrophobic organic compound that is subject to carrier facilitation in the unsaturated zone. The contaminant migration is investigated on long- and short-term time scales and compared to predictions without carrier facilitation. The simulations demonstrate the importance of carrier facilitation and suggest strongly to take this aspect into account. By carrier facilitation breakthrough times at the groundwater level decreased from 500 to approximately 8 years and concentration peaks increased by two orders of magnitude in the long-term simulation assuming a temporary spill in an initially unpolluted soil with a non-sorbing carrier. 相似文献
163.
164.
Uwe Greggers Caspar Schöning Jacqueline Degen Randolf Menzel 《Die Naturwissenschaften》2013,100(8):805-809
Harmonic radar tracking was used to record the flights of scout bees during takeoff and initial flight path of two honeybee swarms. One swarm remained intact and performed a full flight to a destination beyond the range of the harmonic radar, while a second swarm disintegrated within the range of the radar and most of the bees returned to the queen. The initial stretch of the full flight is characterized by accelerating speed, whereas the disintegrating swarm flew steadily at low speed. The two scouts in the swarm displaying full flight performed characteristic flight maneuvers. They flew at high speed when traveling in the direction of their destination and slowed down or returned over short stretches at low speed. Scouts in the disintegrating swarm did not exhibit the same kind of characteristic flight performance. Our data support the streaker bee hypothesis proposing that scout bees guide the swarm by traveling at high speed in the direction of the new nest site for short stretches of flight and slowing down when reversing flight direction. 相似文献
165.
Randolf Menzel Jacqueline Fuchs Leonard Nadler Benjamin Weiss Nicole Kumbischinski Daniel Adebiyi Sergej Hartfil Uwe Greggers 《Die Naturwissenschaften》2010,97(8):763-767
Honeybees use their visual flow field to measure flight distance. It has been suggested that the experience of serial landmarks
encountered on the flight toward a feeding place contributes to distance estimation. Here, we address this question by tracing
the flight paths of individual bees with a harmonic radar system. Bees were trained along an array of three landmarks (tents),
and the distance between these landmarks was either increased or decreased under two test conditions. We find that absolute
distance estimation dominates the search for the feeding place, but serial position effects are also found. In the latter
case, bees search only or additionally at locations determined by serial experience of the landmarks. 相似文献