全文获取类型
收费全文 | 1252篇 |
免费 | 12篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 47篇 |
废物处理 | 55篇 |
环保管理 | 187篇 |
综合类 | 228篇 |
基础理论 | 259篇 |
环境理论 | 2篇 |
污染及防治 | 311篇 |
评价与监测 | 105篇 |
社会与环境 | 76篇 |
灾害及防治 | 9篇 |
出版年
2023年 | 15篇 |
2022年 | 25篇 |
2021年 | 28篇 |
2020年 | 17篇 |
2019年 | 21篇 |
2018年 | 33篇 |
2017年 | 28篇 |
2016年 | 33篇 |
2015年 | 30篇 |
2014年 | 43篇 |
2013年 | 60篇 |
2012年 | 62篇 |
2011年 | 74篇 |
2010年 | 51篇 |
2009年 | 70篇 |
2008年 | 60篇 |
2007年 | 80篇 |
2006年 | 52篇 |
2005年 | 52篇 |
2004年 | 57篇 |
2003年 | 41篇 |
2002年 | 46篇 |
2001年 | 34篇 |
2000年 | 19篇 |
1999年 | 16篇 |
1998年 | 22篇 |
1997年 | 13篇 |
1996年 | 18篇 |
1995年 | 18篇 |
1994年 | 13篇 |
1993年 | 9篇 |
1992年 | 13篇 |
1991年 | 8篇 |
1990年 | 15篇 |
1989年 | 7篇 |
1988年 | 8篇 |
1987年 | 4篇 |
1986年 | 10篇 |
1985年 | 9篇 |
1984年 | 11篇 |
1983年 | 9篇 |
1982年 | 8篇 |
1981年 | 3篇 |
1979年 | 3篇 |
1974年 | 3篇 |
1973年 | 2篇 |
1972年 | 4篇 |
1969年 | 2篇 |
1968年 | 3篇 |
1965年 | 2篇 |
排序方式: 共有1279条查询结果,搜索用时 31 毫秒
961.
Metal immobilization in soils using synthetic zeolites 总被引:6,自引:0,他引:6
In situ immobilization of heavy metals in contaminated soils is a technique to improve soil quality. Synthetic zeolites are potentially useful additives to bind heavy metals. This study selected the most effective zeolite in cadmium and zinc binding out of six synthetic zeolites (mordenite-type, faujasite-type, zeolite X, zeolite P, and two zeolites A) and one natural zeolite (clinoptilolite). Zeolite A appeared to have the highest binding capacity between pH 5 and 6.5 and was stable above pH 5.5. The second objective of this study was to investigate the effects of zeolite addition on the dissolved organic matter (DOM) concentration. Since zeolites increase soil pH and bind Ca, their application might lead to dispersion of organic matter. In a batch experiment, the DOM concentration increased by a factor of 5 when the pH increased from 6 to 8 as a result of zeolite A addition. A strong increase in DOM was also found in the leachate of soil columns, particularly in the beginning of the experiment. This resulted in higher metal leaching caused by metal-DOM complexes. In contrast, the free ionic concentration of Cd and Zn strongly decreased after the addition of zeolites, which might explain the reduction in metal uptake observed in plant growth experiments. Pretreatment of zeolites with acid (to prevent a pH increase) or Ca (to coagulate organic matter) suppressed the dispersion of organic matter, but also decreased the metal binding capacity of the zeolites due to competition of protons or Ca. 相似文献
962.
Trace contamination with dioxin-like chemicals: evaluation of bioassay-based TEQ determination for hazard assessment and regulatory responses 总被引:1,自引:0,他引:1
Ilse Van Overmeire George C. Clark David J. Brown Michael D. Chu W. Marcus Cooke Michael S. Denison Willy Baeyens Sarah Srebrnik Leo Goeyens 《Environmental Science & Policy》2001,4(6):1515
Many recent dioxin contamination events have been traced back to poisoned animal feed or feed ingredients. Therefore, enforcement authorities placed limits on the levels of dioxins in food and feed or implemented strict monitoring and control programs. The levels in force are generally expressed as TEQ values, which inherently accepts the underlying hypothesis that the effects of dioxin-like chemicals are additive. TEQ determination involves either chemo-analysis, with high-resolution gas chromatography in combination with high-resolution mass spectroscopy, or bio-analysis. Bio-analytical methods, more particularly the reporter gene expression method CALUX, are advantageous due to their high throughput rate and low cost. Moreover, the CALUX methodology detects the overall dioxin-like toxicity, rather than the limited number of compounds investigated by chemo-analysis. Bioanalytical methods such as CALUX also differ from chemo-analysis in that the contribution of antagonistic as well as synergistic effects, which violate the additivity principle, can be detected. The application of bio-analytical methods can facilitate a broader assessment of public health risks by intensifying the current monitoring programs in terms of both sample numbers and types. Bio-analysis provides information on the total dioxin-like activity of the samples under study (hazard assessment); however, chemo-analysis is still needed to identify the predominant contaminants (congener identification) for risk management. 相似文献
963.
Walter G. Whitford Justin Van Zee Maliha S. Nash Walter E. Smith Jeffery E. Herrick 《Environmental monitoring and assessment》1999,54(2):143-171
The relative abundance of ant species was measured by pit-fall trapping at 44 sites in southern New Mexico and southeastern Arizona, U.S.A.. Sites were selected for study based on documentation of a history of disturbance or protection from disturbance, exposure to varying intensities of livestock grazing, dominance by an exotic species of plant and vegetation change resulting from disturbance or restoration efforts. Ant community composition, relative abundances of species, and species richness were the same on disturbed and undisturbed sites. None of the metrics based on hypothesized responses of ants to disturbance clearly distinguished between disturbed and undisturbed sites. Ant communities on sites where restoration efforts have resulted in distinct differences in vegetative cover and composition were similar to the ant communities on degraded unrehabilitated sites on the same soil type. Ant communities in riparian cottonwood gallery forests in Arizona and New Mexico were similar but differed from the assemblages in exotic salt cedar and native ash riparian woodlands. Ant species exhibited remarkable resistance to human-induced disturbances in these rangeland areas. In grasslands dominated by the South African grass, Eragrostis lehmanniana Nees, large seed harvesting ants, Pogonomyrmex spp., were greatly reduced in abundance compared to native grasslands. Other ant metrics were not different in E. lehmanniana grasslands and native grasslands. We conclude that ants cannot be used as indicators of exposure to stress, ecosystem health or of rehabilitation success on rangeland ecosystems. Ants are also not useful indicators of faunal biodiversity in rangeland ecosystems. 相似文献
964.
A. Stein J .W. Van Groenigen M. J. Jeger M. R. Hoosbeek 《Environmental and Ecological Statistics》1998,5(2):155-172
This paper presents an overview of space-time statistical procedures to analyse agricultural and environmental related phenomena. It starts with an application on root-rot development in cotton. Dependence modelling in space and time is done with the space-time variogram. Various kriging interpolators are presented for making predictions in space and time. Simulated annealing is used to design an optimal monitoring network for estimation of space-time variograms. In the application no clear indication was found for anisotropy, although strong evidence exists that the disease not only proceeds within rows but also jumps between rows. The optimal sampling scheme showed a spatial clustering of observations at the first and the last monitoring day and less observations at intermediate times. 相似文献
965.
Robert A. Van Zuidam Jamshid Farifteh Marieke A. Eleveld Cheng Tao 《Journal of Coastal Conservation》1998,4(2):191-202
The International Institute for Aerospace Survey and Earth Sciences (ITC) has a research programme that should result in an
integrated environmental coastal zone management system through three subprojects. The programme aims to develop methodologies
and tools for assessing coastal zone changes, and for the evaluation of scenarios for coastal zone management, based on a
spatio-temporal Geographical Information System (GIS) working platform which integrates remote sensing data, physical-morphodynamic
and eco-hydrologic modelling, and a decision support system.
The first subproject develops methodologies for the generation of optimum Remote Sensing (RS) data sets, leading to better
interpretation and complementary use of conventional and new remote sensing imagery. It also integrates RS, GIS, and modelling
through hypothesis generation, parameter estimation, evaluation and validation.
The second subproject facilitates qualitative and quantitative analysis and prediction of the physical aspects of coastal
landscape development under the influence of natural processes and human impacts. This subproject is based on the application
of remote sensing and dynamic modelling.
The third subproject leads to a spatio-temporal working platform which supports data integration of RS and in-situ measurements,
and qualitative and quantitative analysis for the prediction of coastal landscape development. Both support decision making
in Integrated Coastal Zone Management. 相似文献
966.
Vandenhove H Van Hees M Wouters K Wannijn J 《Environmental pollution (Barking, Essex : 1987)》2007,145(2):587-595
Present study aims to quantify the influence of soil parameters on soil solution uranium concentration for (238)U spiked soils. Eighteen soils collected under pasture were selected such that they covered a wide range for those parameters hypothesised as being potentially important in determining U sorption. Maximum soil solution uranium concentrations were observed at alkaline pH, high inorganic carbon content and low cation exchange capacity, organic matter content, clay content, amorphous Fe and phosphate levels. Except for the significant correlation between the solid-liquid distribution coefficients (K(d), L kg(-1)) and the organic matter content (R(2)=0.70) and amorphous Fe content (R(2)=0.63), there was no single soil parameter significantly explaining the soil solution uranium concentration (which varied 100-fold). Above pH=6, log(K(d)) was linearly related with pH [log(K(d))=-1.18 pH+10.8, R(2)=0.65]. Multiple linear regression analysis did result in improved predictions of the soil solution uranium concentration but the model was complex. 相似文献
967.
Verliefde A Cornelissen E Amy G Van der Bruggen B van Dijk H 《Environmental pollution (Barking, Essex : 1987)》2007,146(1):281-289
The occurrence of organic micropollutants in ground- and surface waters has become an important concern for the drinking water industry, mainly because of possible related health effects. Due to the polar nature of some of these pollutants, they are not completely removed by traditional water treatment barriers. This paper offers an overview of priority organic micropollutants and their occurrence in Flemish and Dutch water sources. Furthermore, rejection by nanofiltration is qualitatively predicted for the selected priority micropollutants. The qualitative prediction is based on the values of key solute and membrane parameters in nanofiltration. Predicted values are then compared with experimental values obtained from literature. Overall, the qualitative predictions are roughly in agreement with literature values. Prediction based on key parameters may thus prove to be a very quick and useful technique to assess the implementation of nanofiltration as a treatment step for organic micropollutants in drinking water plant design. 相似文献
968.
A number of chemicals released into the environment share structural similarity to the thyroid hormones (THs), thyroxine (T(4)) and triiodothyronine (T(3)) and it is thought that they may interfere with the thyroid axis and behave as endocrine disruptors (EDs). One of the ways by which such environmental contaminants may disrupt the TH axis is by binding to TH transporter proteins. Transthyretin (TTR) is one of the thyroid hormone binding proteins responsible for TH transport in the blood. TTR forms a stable tetramer that binds both T(4) and T(3) and in fish it is principally synthesized in the liver but is also produced by the brain and intestine. In the present study, we investigate the ability of some chemicals arising from pharmaceutical, industrial or agricultural production and classified as EDs, to compete with [I(125)]-T(3) for sea bream recombinant TTR (sbrTTR). Ioxinyl, a common herbicide and several polybrominated diphenyl ethers were strong inhibitors of [I(125)]-T(3) binding to TTR and some showed even greater affinity than the natural ligand T(3). The TTR competitive binding assay developed offers a quick and effective tool for preliminary risk assessment of chemicals which may disrupt the thyroid axis in teleost fish inhabiting vulnerable aquatic environments. 相似文献
969.
Van Gerven T Cornelis G Vandoren E Vandecasteele C 《Waste management (New York, N.Y.)》2007,27(7):977-985
Porosity is possibly an important parameter with respect to leaching of constituents from cement monoliths. During its lifetime, the pore structure of cementitious matrices changes due to carbonation and leaching. This paper discusses the effects of both accelerated carbonation and continuous leaching on the porosity, and, conversely, how porosity affects leaching properties. Two sample types are investigated: a mortar with MSWI-bottom ash substituting the sand fraction and a cement paste with 30 wt% of the cement substituted by a flue gas cleaning residue. The samples have been intensively carbonated in a 20% CO(2) atmosphere for up to 60 days and were subsequently leached. The porosity was investigated by mercury intrusion porosimetry. Accelerated carbonation decreases total porosity by 12% in the case of 60 days of treatment of bottom ash mortars, whereas continuous leaching during 225 days increases it by 16%. Both carbonation and leaching decrease the amount of smaller capillary pores. Carbonation decreases both porosity and pH. Decreasing porosity diminishes leaching of sodium and potassium, while the decrease in pH increases leaching. However, the former process dominates the latter, resulting in a net decreasing effect of carbonation on the release of sodium and potassium from these cement matrices. 相似文献