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排序方式: 共有751条查询结果,搜索用时 140 毫秒
721.
Assessment of surface water quality of selected estuaries of Malaysia: multivariate statistical techniques 总被引:2,自引:0,他引:2
Multivariate statistical techniques such as cluster analysis (CA), factor analysis (FA) were used for the evaluation of spatial
variations and the interpretation of a large complex water quality data set of two selected estuaries of Malaysia. The two
locations of interest with 10 sites in each location were Kuala Juru (Juru estuary) and Bukit Tambun (Jejawi estuary). Cluster
analysis showed that some sites in both locations have similar sources of pollution from point or non-point sources whereas
FA yielded four factors which are responsible for water quality variations explaining more than 80% of the total variance
of the data set and allowed to group the selected water quality. Correlation analysis of the data showed that some parameters
have strong association with other parameters and they share a common origin source. This study illustrates the usefulness
of multivariate statistical analysis for evaluation and interpretation of complex data sets to get better information about
the pollution sources/factors and understanding the behavior of the parameters in water quality for effective river water
quality management. 相似文献
722.
Evaluating the impact of water conservation on fate of outdoor water use: a study in an arid region 总被引:2,自引:0,他引:2
In this research, the impact of several water conservation policies and return flow credits on the fate of water used outdoors in an arid region is evaluated using system dynamics modeling approach. Return flow credits is a strategy where flow credits are obtained for treated wastewater returned to a water body, allowing for the withdrawal of additional water equal to the amount returned as treated wastewater. In the return credit strategy, treated wastewater becomes a resource. This strategy creates a conundrum in which conservation may lead to an apparent decrease in water supply because less wastewater is generated and returned to water body. The water system of the arid Las Vegas Valley in Nevada, USA is used as basis for the dynamic model. The model explores various conservation scenarios to attain the daily per capita demand target of 752 l by 2035: (i) status quo situation where conservation is not implemented, (ii) conserving water only on the outdoor side, (iii) conserving water 67% outdoor and 33% indoor, (iv) conserving equal water both in the indoor and outdoor use (v) conserving water only on the indoor side. The model is validated on data from 1993 to 2008 and future simulations are carried out up to 2035. The results show that a substantial portion of the water used outdoor either evapo-transpires (ET) or infiltrates to shallow groundwater (SGW). Sensitivity analysis indicated that seepage to groundwater is more susceptible to ET compared to any other variable. The all outdoor conservation scenario resulted in the highest return flow credits and the least ET and SGW. A major contribution of this paper is in addressing the water management issues that arise when wastewater is considered as a resource and developing appropriate conservation policies in this backdrop. The results obtained can be a guide in developing outdoor water conservation policies in arid regions. 相似文献
723.
The selective catalytic reduction (SCR) characteristics of NO and NO(2) over V(2)O(5)-WO(3)-MnO(2)/TiO(2) catalyst using ammonia as a reducing agent have been determined in a fixed-bed reactor at 200-400 degrees C. The presence of NO(2) enhances the SCR activity at lower temperatures and the optimum ratio of NO(2)/NO(x) is found to be 0.5. During the SCR reactions, there are some side reactions occurred such as ammonia oxidation and N(2)O formation. At higher temperatures, the selective catalytic oxidation of ammonia and the nitrous oxide formation compete with the SCR reactions. The denitrification (DeNO(x)) conversion decreases at lower temperatures but it increases at higher temperatures with increasing SO(2) concentration. The presence of SO(2) in the feeds inhibits N(2)O formation. 相似文献
724.
Sorption and transport of trichloroethylene in caliche soil 总被引:3,自引:0,他引:3
Sorption of TCE to the caliche soil exhibited linear isotherm at the high TCE concentrations (Co = 122-1300 mg L−1) but Freundlich isotherm at the low concentration range (1-122 mg L−1). Sorption strength of the carbonate fraction of the soil was about 100-fold lower than the sorption strength of soil organic matter (SOM) in the caliche soil, indicating weak affinity of TCE for the carbonate fraction of the soil. Desorption of TCE from the caliche soil was initially rapid (7.6 × 10−4 s−1), then continued at a 100-fold slower rate (7.7 × 10−6 s−1). Predominant calcium carbonate fraction of the soil (96%) was responsible for the fast desorption of TCE while the SOM fraction (0.97%) controlled the rate-limited desorption of TCE. Transport of TCE in the caliche soil was moderately retarded with respect to the water (R = 1.75-2.95). Flow interruption tests in the column experiments indicated that the rate-limited desorption of TCE controlled the non-ideal transport of TCE in the soil. Modeling studies showed that both linear and non-linear nonequilibrium transport models provided reasonably good match to the TCE breakthrough curves (r2 = 0.95-0.98). Non-linear sorption had a negligible impact on both the breakthrough curve shape and the values of sorption kinetics parameters at the high TCE concentration (Co = 1300 mg L−1). However, rate-limited sorption/desorption processes dominated at this concentration. For the low TCE concentration case (110 mg L−1), in addition to the rate-limited sorption/desorption, contribution of the non-linear sorption to the values of sorption kinetics became fairly noticeable. 相似文献
725.
Alnawajha Mohammad Mohammad Kurniawan Setyo Budi Imron Muhammad Fauzul Abdullah Siti Rozaimah Sheikh Hasan Hassimi Abu Othman Ahmad Razi 《Environmental science and pollution research international》2022,29(39):58430-58453
Environmental Science and Pollution Research - The increasing intensification of the aquaculture industry requires the development of new strategies to reduce the negative impacts of wastewater on... 相似文献
726.
Zare Sakhvidi Mohammad Javad Zarei Abdorreza Hachesu Vida Rezaei Zolfaghari Ahmad 《Environmental science and pollution research international》2022,29(32):48347-48347
Environmental Science and Pollution Research - 相似文献
727.
Rabbany Md Ghulam Mehmood Yasir Hoque Fazlul Sarker Tanwne Hossain Kh Zulfikar Khan Arshad Ahmad Hossain Mohammad Shakhawat Roy Rana Luo Jianchao 《Environmental science and pollution research international》2022,29(1):444-456
Environmental Science and Pollution Research - This study analyzes the effects of credit constraints on technical efficiency of Boro rice growers in the district of Pabna in Bangladesh. Using a... 相似文献
728.
Khanna Kanika Kohli Sukhmeen Kaur Ohri Puja Bhardwaj Renu Ahmad Parvaiz 《Environmental science and pollution research international》2022,29(21):30908-30934
Environmental Science and Pollution Research - Cadmium (Cd) is considered to be one of the most toxic pollutants persistent in soil for thousands of years and is ranked on seventh position among... 相似文献
729.
Environment, Development and Sustainability - Pastoralism is mostly related to specific ethnic group or group of people whose livelihoods generally depend on production of livestock in the... 相似文献
730.
Qayyum Muhammad Abdul Sultan Muhammad Habib Farooq Zahid Muddassir Khawaja Farooq Tahir Irfan Ahmad 《Environmental science and pollution research international》2022,29(55):83191-83210
Environmental Science and Pollution Research - Esophageal cancer is a very deadly disease ranking 8th most common cancer in terms of incidence and the 6th highest in terms of mortality both in the... 相似文献