全文获取类型
收费全文 | 648篇 |
免费 | 6篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 36篇 |
废物处理 | 22篇 |
环保管理 | 118篇 |
综合类 | 114篇 |
基础理论 | 135篇 |
环境理论 | 1篇 |
污染及防治 | 179篇 |
评价与监测 | 32篇 |
社会与环境 | 15篇 |
灾害及防治 | 4篇 |
出版年
2022年 | 7篇 |
2021年 | 12篇 |
2020年 | 12篇 |
2019年 | 5篇 |
2018年 | 3篇 |
2017年 | 11篇 |
2016年 | 19篇 |
2015年 | 21篇 |
2014年 | 29篇 |
2013年 | 45篇 |
2012年 | 26篇 |
2011年 | 48篇 |
2010年 | 35篇 |
2009年 | 21篇 |
2008年 | 27篇 |
2007年 | 43篇 |
2006年 | 38篇 |
2005年 | 25篇 |
2004年 | 35篇 |
2003年 | 22篇 |
2002年 | 17篇 |
2001年 | 4篇 |
1999年 | 8篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1995年 | 3篇 |
1994年 | 8篇 |
1993年 | 8篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1980年 | 5篇 |
1979年 | 3篇 |
1972年 | 3篇 |
1961年 | 3篇 |
1952年 | 2篇 |
1940年 | 3篇 |
1939年 | 2篇 |
1937年 | 2篇 |
1930年 | 2篇 |
1928年 | 2篇 |
1926年 | 3篇 |
1923年 | 2篇 |
1914年 | 3篇 |
1913年 | 4篇 |
排序方式: 共有656条查询结果,搜索用时 932 毫秒
351.
Vladimir Kucera Johan Tidblad Katerina Kreislova Dagmar Knotkova Markus Faller Daniel Reiss Rolf Snethlage Tim Yates Jan Henriksen Manfred Schreiner Michael Melcher Martin Ferm Roger-Alexandre Lefèvre Joanna Kobus 《Water, Air, & Soil Pollution: Focus》2007,7(1-3):249-258
A “multi-pollutant exposure programme” reflecting the new pollution situation where SO2 is no longer the dominating pollutant has been performed by the International Co-operative Programme on Effects on Materials,
including Historic and Cultural Monuments (ICP Materials) within the activities of the Convention on Long-range Transboundary
Air Pollution. The main results obtained in the period 1997–2003 are summarised. Dose-response functions are presented for
carbon steel, zinc, copper, bronze and limestone. Parameters involved in the functions include besides SO2 and pH, which were included in the previously developed functions from ICP Materials, also the effect of particulate matter
and HNO3. 相似文献
352.
353.
Andersson P Byegård J Tullborg EL Doe T Hermanson J Winberg A 《Journal of contaminant hydrology》2004,70(3-4):271-297
Experiments were conducted at the Asp? Hard Rock Laboratory in order to improve the understanding of radionuclide retention properties of fractured crystalline bedrock in the 10-100 m scale (TRUE Block Scale Project, jointly funded by ANDRA, ENRESA, Nirex, JNC, Posiva and SKB). A series of tracer experiments were performed using sorbing tracers in three different flow paths. The different flow paths had Euclidian lengths of 14, 17 and 33 m, respectively, and one to three water conducting structures. Four tests were performed using different cocktails made up of radioactive sorbing tracers (22,24Na+, 42K+, 47Ca2+, 85Sr2+, 83,86Rb+, 131,133Ba2+ and 134,137Cs+). For each tracer injection, the breakthrough of sorbing tracers was compared to the breakthrough of a conservative tracer, 82Br-, 131I-, HTO and 186ReO4-, respectively. In the two longer flow paths, no breakthrough of 83Rb+ and 137Cs+ was observed after 8 months of pumping. Selected tracer tests were subject to basic modelling in which a one-dimensional (1D) advection-dispersion model, including surface sorption, and an unlimited matrix diffusion were used for the interpretation of the results. The results of the modelling indicated that there is a slightly higher mass transfer into a highly porous material in the block-scale experiment compared with in situ experiments performed over shorter distances and significantly higher than what would have been expected from laboratory data obtained from studies of the interactions in nonaltered intact rock. 相似文献
354.
Fuminori Ito Yoshifumi Touyama Ayako Gotoh Shungo Kitahiro Johan Billen 《Die Naturwissenschaften》2010,97(8):725-728
Thelytokous parthenogenesis in which diploid females are produced from unfertilized eggs, was recently reported for some ant
species. Here, we document thelytokous reproduction by queens in the polygynous species Pyramica membranifera. Queens that emerged in the laboratory were kept with or without workers under laboratory conditions. Independent colony
founding was successful for a few queens if prey was provided. All artificial colonies, which started with a newly emerged
queen and workers produced new workers and some of the colonies also produced female sexuals. Some of the female sexuals shed
their wings in the laboratory and started formation of new polygynous colonies. Workers had no ovaries and thus, were obligatorily
sterile. 相似文献
355.
356.
Daniel M. Evans Carl E. Zipper Erich T. Hester Stephen H. Schoenholtz 《Journal of the American Water Resources Association》2015,51(5):1436-1452
Surface coal mining operations alter landscapes of the Appalachian Mountains, United States, by replacing bedrock with mine spoil, altering topography, removing native vegetation, and constructing mine soils with hydrologic properties that differ from those of native soils. Research has demonstrated hydrologic effects of mining and reclamation on Appalachian landscapes include increased peakflows at newly mined and reclaimed watersheds in response to strong storm events, increased subsurface void space, and increased base flows. We review these investigations with a focus on identifying changes to hydrologic flow paths caused by surface mining for coal in the Appalachian Mountains. We introduce two conceptual control points that govern hydrologic flow paths on mined lands, including the soil surface that partitions infiltration vs. surface runoff and a potential subsurface zone that partitions subsurface storm flow vs. deeper percolation. Investigations to improve knowledge of hydrologic pathways on reclaimed Appalachian mine sites are needed to identify effects of mining on hydrologic processes, aid development of reclamation methods to reduce hydrologic impacts, and direct environmental mitigation and public policy. 相似文献
357.
Seasonal and Regional Patterns in Performance for a Baltic Sea Drainage Basin Hydrologic Model
下载免费PDF全文
![点击此处可从《Journal of the American Water Resources Association》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Steve W. Lyon Roya Meidani Ype van der Velde Helen E. Dahlke Dennis P. Swaney Carl‐Magnus Mörth Christoph Humborg 《Journal of the American Water Resources Association》2015,51(2):550-566
This study evaluates the ability of the Catchment SIMulation (CSIM) hydrologic model to describe seasonal and regional variations in river discharge over the entire Baltic Sea drainage basin (BSDB) based on 31 years of monthly simulation from 1970 through 2000. To date, the model has been successfully applied to simulate annual fluxes of water from the catchments draining into the Baltic Sea. Here, we consider spatiotemporal bias in the distribution of monthly modeling errors across the BSDB since it could potentially reduce the fidelity of predictions and negatively affect the design and implementation of land‐management strategies. Within the period considered, the CSIM model accurately reproduced the annual flows across the BSDB; however, it tended to underpredict the proportion of discharge during high‐flow periods (i.e., spring months) and overpredict during the summer low flow periods. While the general overpredictions during summer periods are spread across all the subbasins of the BSDB, the underprediction during spring periods is seen largely in the northern regions. By implementing a genetic algorithm calibration procedure and/or seasonal parameterization of subsurface water flows for a subset of the catchments modeled, we demonstrate that it is possible to improve the model performance albeit at the cost of increased parameterization and potential loss of parsimony. 相似文献
358.
This paper provides background information on emergency Safe Spaces for children and specific information for responses in Haiti and the Solomon Islands. In 2007, both countries experienced natural disasters that resulted in internal displacement of thousands of people. The Save the Children Alliance created Safe Spaces for children living in camps for internally displaced persons. The project sought to accomplish ‘B‐SAFE’ strategies through emergency education, psychosocial, and protection interventions. The B‐SAFE strategies are to (B)uild relationships, cooperation, and respect among peers; to (S)creen for high‐risk children and youth; (A)ctive, structured learning and life saving information; to (F)acilitate children's natural resilience and a return to normalcy; and to (E)stablish a sense of security and self‐esteem. The project made use of child and parent surveys and observation tools that measured B‐SAFE indicators. Analysed data demonstrated an improvement in children's behavior participating in the programme. 相似文献
359.
Seungho Jung Dedy Ng Carl D. Laird M. Sam Mannan 《Journal of Loss Prevention in the Process Industries》2010,23(6):824-830
The present work is focused on developing a methodology to find the optimal placement of a hazardous process unit and other facilities using optimization theory while considering a risk map in the plant area. Incidents can have possible consequences resulting from flammable gas releases, which can be evaluated by using consequence modeling programs. The probability of each incident can be derived from initial leak hole size estimation through event tree analysis. In this methodology the plant area was divided into square grids and risk scores were estimated for each grid. The overall cost is a function of the probable cost of property damage due to fires or explosions and the interconnection cost including piping, cable, and management. The proposed approach uses a mixed integer linear optimization programming (MILP) that identifies attractive locations by minimizing the overall cost. A case study is presented for a hexane–heptane separation facility that considers the meteorological data for the given area in order to show the applicability of the proposed methodology. Results from this study will be useful in assisting the selection of locations for facilities and for risk management. 相似文献
360.
Worker allocation in insect societies: coordination of nectar foragers and nectar receivers in honey bee (Apis mellifera) colonies 总被引:1,自引:0,他引:1
Nectar collection in the honey-bee is partitioned. Foragers collect nectar and take it to the nest, where they transfer it
to receiver bees who then store it in cells. Because nectar is a fluctuating and unpredictable resource, changes in worker
allocation are required to balance the work capacities of foragers and receivers so that the resource is exploited efficiently.
Honey bee colonies use a complex system of signals and other feedback mechanisms to coordinate the relative and total work
capacities of the two groups of workers involved. We present a functional evaluation of each of the component mechanisms used
by honey bees – waggle dance, tremble dance, stop signal, shaking signal and abandonment – and analyse how their interplay
leads to group-level regulation. We contrast the actual regulatory system of the honey bee with theory. The tremble dance
conforms to predicted best use of information, where the group in excess applies negative feedback to itself and positive
feedback to the group in shortage, but this is not true of the waggle dance. Reasons for this and other discrepancies are
discussed. We also suggest reasons why honey bees use a combination of recruitment plus abandonment and not switching between
subtasks, which is another mechanism for balancing the work capacities of foragers and receivers. We propose that the waggle
and tremble dances are the primary regulation mechanisms, and that the stop and shaking signals are secondary mechanisms,
which fine-tune the system. Fine-tuning is needed because of the inherent unreliability of the cues, queueing delays, which
foragers use to make recruitment decisions.
Received: 15 December 1998 / Received in revised form: 6 March 1999 / Accepted: 12 March 1999 相似文献