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761.
Sunderasan Srinivasan Raj Kumar Singh 《Environment, Development and Sustainability》2010,12(5):825-837
Civil coercion has its limitations, government regulation is only as effective as enforcement and investors base their estimates of firm value on information available from the firms themselves and from other sources. While voluntary disclosure is construed as being selective or incomplete, negative non-financial news such as details of fines imposed for environmental violation is reflected in lower stock prices for a short duration. This paper evaluates the persistence of goodwill capital for a sample of Indian companies from select industries, graded by their environmental performance. We conclude that investor concern differs across industries and that the correlation of environmental performance with firm valuation is, at best, weak and short-lived. Periodic scrutiny and announcement of industry environmental performance by appropriately equipped independent agencies could help coordinate and sustain stake-holder pressure on industry. 相似文献
762.
Evaluation of suitable tiger habitat in Chandoli National Park,India, using spatial modelling of environmental variables 总被引:1,自引:0,他引:1
Application of remote sensing and Geographic Information System (GIS) as a tool has assumed an immense significance in habitat suitability modelling for various wildlife species and now a days these are widely used in conservation biology and wildlife management. 相似文献
763.
Evaluation of the QUIC-URB fast response urban wind model for a cubical building array and wide building street canyon 总被引:3,自引:0,他引:3
Balwinder Singh Bradley S. Hansen Michael J. Brown Eric R. Pardyjak 《Environmental Fluid Mechanics》2008,8(4):281-312
This paper describes the QUIC-URB fast response urban wind modeling tool and evaluates it against wind tunnel data for a 7 × 11 cubical building array and wide building street canyon. QUIC-URB is based on the Röckle diagnostic wind modeling strategy that rapidly produces spatially resolved wind fields in urban areas and can be used to drive urban dispersion models. Röckle-type models do not solve transport equations for momentum or energy; rather, they rely heavily on empirical parameterizations and mass conservation. In the model-experiment comparisons, we test two empirical building flow parameterizations within the QUIC-URB model: our implementation of the standard Röckle (SR) algorithms and a set of modified Röckle (MR) algorithms. The MR model attempts to build on the strengths of the SR model and introduces additional physically based, but simple parameterizations that significantly improve the results in most regions of the flow for both test cases. The MR model produces vortices in front of buildings, on rooftops and within street canyons that have velocities that compare much more favorably to the experimental results. We expect that these improvements in the wind field will result in improved dispersion calculations in built environments. 相似文献
764.
The treatment of groundwater contaminated with low concentrations of methyl tertiary butyl ether (MTBE) is of nationwide concern. Many treatment techniques include removing MTBE vapors from groundwater, resulting in airstreams that require treatment. One method used for air‐phase MTBE treatment is biofiltration. In a biofilter, the vapors pass through a reactor that contains MTBE‐biodegrading organisms attached to a porous media. This article reports the results of a biofiltration study to treat air contaminated with MTBE at concentrations of 0.2 to 0.33 mg/l, concentrations frequently encountered in the field. The results indicate that MTBE removal at these low concentrations is not as efficient as removals seen at higher concentrations. Activated carbon was shown to be a superior biofiltration medium, compared with media that do not adsorb MTBE vapors. Activated carbon was especially helpful in treatment shock loads of MTBE. © 2002 Wiley Periodicals, Inc. 相似文献
765.
Use of adjuvants to minimize leaching of herbicides in soil 总被引:1,自引:0,他引:1
Excessive leaching of herbicides affects their efficacy against target weeds and results in contamination of groundwater.
Use of adjuvants that can weakly bind herbicides and in turn release them slowly is a valuable technique to prolong the efficacy
of herbicides and to minimize their leaching into groundwater. Effects of activated charcoal, three humic substances (Enersol
SP 85%, Enersol 12%, and Agroliz), or a synthetic polymer (Hydrosorb) on the leaching of bromacil, dicamba, and simazine were
investigated in leaching columns using a Candler fine sand (Typic Quartzipsamment). The addition of adjuvants had no harmful
effects on physical properties of the soil as evident from lack of its affects on water percolation. When no adjuvants were
used, 69%, 37%, and 4% of applied dicamba, bromacil, and simazine, respectively, were leached in the first pore volume of
leachate (⋍3.2 cm rainfall). With five pore volumes of leachate (⋍16 cm rainfall), bromacil and dicamba were leached completely
and only 80% of simazine was leached. Using Enersol 12% adjuvant resulted in a 13%–18% reduction in leaching of dicamba and
bromacil in five pore volumes of leachate. The leaching of simazine was significantly decreased when any of the five adjuvants
mentioned above were used. However, the decrease in leaching was significantly greater when using Enersol SP 85% or Enersol
12% (24%–28%) than when using the other adjuvants (12%–16%). 相似文献
766.
M. L. Cropper Dwight R. Lee Sukhraj Singh Pannu 《Journal of Environmental Economics and Management》1979,6(4):341-349
This paper examines conditions for extinction when the net benefits from a renewable resource are a nonlinear function of the harvest rate. As in the linear case, extinction depends on the size of the interest rate relative to the growth potential of the species. Here, however, the size of the initial resource stock is also crucial. It is shown that extinction is optimal if the interest rate is greater than the growth potential of the species, but only for small initial stocks. Indeed, if the initial stock is sufficiently high, extinction need not be optimal even if the interest rate is infinite. 相似文献
767.
J. M. Hill V. P. Singh H. Aminian 《Journal of the American Water Resources Association》1987,23(1):21-27
ABSTRACT: A computerized geographic information system (GIS) was created in support of data requirements by a hydrologic model designed to predict the runoff hydrograph from ungaged basins. Some geomorphologic characteristics (i.e., channel lengths) were manually measured from topographic maps, while other parameters such as drainage area and number of channels of a specified order, land use, and soil type were digitized and manipulated through use of the GIS. The model required the generation of an integrated Soil Conservation Service (SCS) curve number for the entire basin. To this end, soil associations and land use (generated from analysis of Landsat satellite data) were merged in the GIS to acquire a map representing SCS runoff curve numbers. The volume of runoff obtained from the Watershed Hydrology Simulation (WAHS) Model using this map was compared to the volume computed by hydrograph separation and found to be accurate within 19 percent error. To quantify the effect of changing land use on basin hydrology, the GIS was used to vary percentages from the drainage area from forest to bare soil. By changing the basin runoff curve numbers, significant changes in peak discharge were noted; however, the time to peak discharge remained essentially independent of change in area of land use. The GIS capability eliminated many of the more traditional manual phases of data input arid manipulation, thereby allowing researchers to concentrate on the development and calibration of the model and the interpretation of presumably more accurate results. 相似文献
768.
Chandni Singh 《Local Environment》2013,18(8):790-791
769.
Rohit Sharma Ranjit Singh 《International journal of occupational safety and ergonomics》2013,19(2):363-373
The main aim of this paper was to identify job stressors, gender responses and association of psychosocial work stressors with prevalence of work related musculoskeletal disorders (MSDs) among foundry workers. The data were obtained with ergonomics checklist using Likert scale. The results of this study showed a high prevalence of MSDs among workers. The male workers were more prone to pain in neck while the female workers were more prone to MSDs in upper back and shoulders. Correlation analysis showed significant relationship of dimensions of work aspects with pain and discomfort. It proved that the work-related MSDs are the results of interaction of multiple stressors associated with work and work environment, and other personal factors. ANOVA indicated that the perception of work aspects as stressors differed significantly between male and female workers. 相似文献
770.
The stability of coumaphos [O,O-diethyl O-(3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7 yl)phosphorothioatel was studied in model dipping vats under field conditions using 14C-labelled and unlabelled coumaphos, with or without additives. The stability of coumaphos in model vats increased significantly by maintaining a pH of 5 by addition of superphosphate. Copper sulphate amendment did not seem to have any additional effect on stability. Potasan was the major metabolite in addition to chlorferon and 4-methylumbelliferone. Coumaphos concentration was doubled in the sediment of vat treated with copper sulphate as compared to the control vat as a result of emulsion breakdown. Chlorferon was the only metabolite detected in the sediment of the former vat indicating inhibition of the anaerobic degradation. 相似文献