全文获取类型
收费全文 | 102篇 |
免费 | 0篇 |
专业分类
安全科学 | 6篇 |
废物处理 | 9篇 |
环保管理 | 7篇 |
综合类 | 12篇 |
基础理论 | 12篇 |
污染及防治 | 38篇 |
评价与监测 | 7篇 |
社会与环境 | 11篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2019年 | 4篇 |
2018年 | 6篇 |
2017年 | 5篇 |
2016年 | 1篇 |
2015年 | 4篇 |
2014年 | 7篇 |
2013年 | 8篇 |
2012年 | 2篇 |
2011年 | 7篇 |
2010年 | 5篇 |
2009年 | 7篇 |
2008年 | 2篇 |
2007年 | 5篇 |
2006年 | 1篇 |
2005年 | 5篇 |
2004年 | 4篇 |
2003年 | 9篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1994年 | 2篇 |
1990年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1962年 | 1篇 |
排序方式: 共有102条查询结果,搜索用时 31 毫秒
1.
2.
3.
4.
F. Monna F. van Oort P. Hubert J. Dominik J. Bolte J.-L. Loizeau J. Labanowski J. Lamri C. Petit G. Le Roux C. Chateau 《Journal of environmental radioactivity》2009
An 80-year soil archive, the 42-plot experimental design at the INRA in Versailles (France), is used here to study long-term contamination by 137Cs atmospheric deposition and the fate of this radioisotope when associated with various agricultural practices: fallow land, KCl, NH4(NO3), superphosphate fertilizers, horse manure and lime amendments. The pertinence of a simple box model, where radiocaesium is supposed to move downward by convectional mechanisms, is checked using samples from control plots which had been neither amended, nor cultivated since 1928. This simple model presents the advantage of depending on only two parameters: α, a proportional factor allowing the historical atmospheric 137Cs fluxes to be reconstructed locally, and k, an annual loss coefficient from the plow horizon. Another pseudo-unknown is however necessary to run the model: the shape of historical 137Cs deposition, but this function can be easily computed by merging several curves previously established by other surveys. A loss of ∼1.5% per year from the plow horizon, combined with appropriate fluxes, provides good concordance between simulated and measured values. In the 0–25 cm horizon, the residence half time is found to be ∼18 yr (including both migration and radioactive decay). Migration rate constants are also calculated for some plots receiving continuous long-term agricultural treatments. Comparison with the control plots reveals significant influence of amendments on 137Cs mobility in these soils developed from a unique genoform. 相似文献
5.
Umar Farooq Makshoof Athar Misbahul Ain Khan Janusz A. Kozinski 《Environmental monitoring and assessment》2013,185(1):845-854
The sorption capacity parameters obtained for batch studies provide useful information about biosorption system. However, such data fail to explain the process under continuous-flow conditions. The present study is an attempt to explore the biosorption of Pb(II) and Cr(III) by straw from local wheat (Triticum aestivum). The biosorbent has been characterized by using Fourier transform infrared spectroscopy and surface area and elemental analyses and found to be porous and polyfunctional. S-shaped breakthrough curves were obtained at different column heights for the both metal ions. Various breakthrough parameters and saturation times have been determined. The column data have been successfully used to study the Bohart–Adams' bed depth service time (BDST) model and Yoon and Nelson's model. It was found that BDST model quite efficiently explained the whole column data whereas Yoon and Nelson model could explain it below 90 % breakthrough concentration. The predicted and calculated BDST parameters were in agreement with each other. Yoon and Nelson's constant decreased with an increase in the column height for both metal ions. Effect of change in flow rate on the Pb(II) biosorption has also been discussed with respect to BDST approach. 相似文献
6.
Janusz Kloskowski Marek Nieoczym Marcin Polak Piotr Pitucha 《Die Naturwissenschaften》2010,97(7):673-682
Fish may significantly affect habitat use by birds, either as their prey or as competitors. Fish communities are often distinctly
size-structured, but the consequences for waterbird assemblages remain poorly understood. We examined the effects of size
structure of common carp (Cyprinus carpio) cohorts together with other biotic and abiotic pond characteristics on the distribution of breeding waterbirds in a seminatural
system of monocultured ponds, where three fish age classes were separately stocked. Fish age corresponded to a distinct fish
size gradient. Fish age and total biomass, macroinvertebrate and amphibian abundance, and emergent vegetation best explained
the differences in bird density between ponds. Abundance of animal prey other than fish (aquatic macroinvertebrates and larval
amphibians) decreased with increasing carp age in the ponds. Densities of ducks and smaller grebes were strongly negatively
associated with fish age/size gradient. The largest of the grebes, the piscivorous great crested grebe (Podiceps cristatus), was the only species that preferred ponds with medium-sized fish and was positively associated with total fish biomass.
Habitat selection by bitterns and most rallids was instead strongly influenced by the relative amount of emergent vegetation
cover in the ponds. Our results show that fish size structure may be an important cue for breeding habitat choice and a factor
affording an opportunity for niche diversification in avian communities. 相似文献
7.
Nagasaka K Mizuno K Tanaka E Yamamoto S Iwamoto M Miki K Kajzer J 《Traffic injury prevention》2003,4(4):345-354
In vehicle-pedestrian collisions, lower extremities of pedestrians are frequently injured by vehicle front structures. In this study, a finite element (FE) model of THUMS (total human model for safety) was modified in order to assess injuries to a pedestrian lower extremity. Dynamic impact responses of the knee joint of the FE model were validated on the basis of data from the literature. Since in real-world accidents, the vehicle bumper can impact the lower extremities in various situations, the relations between lower extremity injury risk and impact conditions, such as between impact location, angle, and impactor stiffness, were analyzed. The FE simulation demonstrated that the motion of the lower extremity may be classified into a contact effect of the impactor and an inertia effect from a thigh or leg. In the contact phase, the stress of the bone is high in the area contacted by the impactor, which can cause fracture. Thus, in this phase the impactor stiffness affects the fracture risk of bone. In the inertia phase, the behavior of the lower extremity depends on the impact locations and angles, and the knee ligament forces become high according to the lower extremity behavior. The force of the collateral ligament is high compared with other knee ligaments, due to knee valgus motions in vehicle-pedestrian collisions. 相似文献
8.
Model experiments were performed to determine the influence of UV-VIS-NIR radiation on zinc bonded with humic acid (HA). The samples of HA or HA-65Zn radioisotope were overlayed on quartz sand in a glass column and subjected to elution that simulated natural conditions. The zinc concentration was chosen to that occurring in the sewage of the Central Sewage Work in Poznań. Zinc was washed with water to simulate the influence of rain. The recovery of injected radiotraces ions in the eluates was found to depend on pH, zinc and HA concentrations and on radiation exposure. The results help to evaluate the migration behavior of zinc in the presence of HA and UV-VIS-NIR radiation. From the first part of the investigation appears that radiation induces a degradation of HA-Zn layer and that the degradation process depends on pH of the environment. A decrease in pH causes an increase in photodegradation and the degree of zinc binding in the humic layer. Simultaneously, the ultra-weak luminescence (UWL) of plants was monitored to estimate the influence of zinc and HA on their development. The results show effects of HA and zinc on UWL and growth of bean and watercress which characterize the rate of plants metabolism and perturbation of their homeostasis. It was observed that high concentrations of zinc ions and HA considerably affect the development process of the plants. 相似文献
9.
10.