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121.
Norhayati Mohd. Tahir A.R. Abdullah S. Shanmugam 《Environmental geochemistry and health》1997,19(2):67-71
To determine the level of total hydrocarbon concentrations (THCs) along the eastern coastal regions of Peninsular Malaysia, samples of subsurface seawater (1 m) and surface sediments were collected from several sampling stations between June and August 1993. THCs in seawater and sediments as determined by fluorescence spectroscopy ranged from 1.4 to 21.8 µg L-1 (Seligi crude oil equivalents) and from 0.79 to 20.0 mg kg-1 (dry weight Seligi crude oil equivalents) respectively. In comparison to results obtained in similar surveys in Malaysian waters, the levels of THCs found in the present study were significantly lower indicating lower hydrocarbon contamination in the area studied. 相似文献
122.
Saad F. Tahir Carolyn A. Koh 《Environmental science and pollution research international》1996,3(1):20-23
Bench-scale experiments have been conducted to evaluate a series of titania-supported Pt-Pd (as oxides) catalysts in the presence and absence of MoO3 and Fe2O3 additives for their effectiveness in the complete catalytic oxidation of volatile organic compounds (VOCs) in air likely to be found in waste gases. Under oxidizing conditions, all of the catalysts promoted the complete oxidation of VOCs to CO2 and H2O. 99 % Conversion was achieved with a C2H4-C2H6 gas mixture in air at temperatures between about 160–450 °C and at a space velocity of 20,000 h?1. Oxidation activity for the titania supported catalysts were found to decrease in the order Pt-Pd-Mo-Fe > Pt-Pd-Mo > Pt-Pd-Fe > Pt-Pd. However, the addition of MoO3 and Fe2O3 increase the catalyst activity and reduce the reaction temperature for the complete destruction. Ageing was also performed in order to study the stability of the most active catalyst. Pt-Pd-Mo-Fe (as oxides) on titania catalyst is effective in oxidizing a wide range of volatile organic compounds at relatively low temperatures (220–405 °C) and and at a space velocity of 40,000 h?1 and is resistant to poisoning by halogenated and amine volatile organic compounds. 相似文献
123.
This paper describes a method for assessing the degree of sustainability of a business operation, in terms of indicators related to the sustainability impacts of its particular activities. The Process Analysis Method considers the impact on the capital residing in the three domains: the environment, the economy and the domain of human/social capital. It is found, using the Brundtland definition of sustainability, that these impacts can be related to two business perspectives: (1) Resource efficiency, which measures the effectiveness of conversion of natural, financial, human and social capital; (2) Fairness in benefit which describes how fairly the benefits and disbenefits of changes in the three domains are distributed amongst stakeholders.The method requires a complete review of the activities of the business within an appropriately defined system boundary, in order to make an inventory of activities which affect the capital stores of value; those effects are found to relate to the business perspectives. The effects of these activities on stakeholders are identified, and those which are deemed to be significant are characterised by issues: these determine the selection of indicators whose values are given by metrics. The methodology thus enables the development of a comprehensive set of sustainability indicators and metrics for the particular business operation. The set of indicators will be similar for businesses with similar activities, so the methodology facilitates comparison and benchmarking. Further, the value of a particular indicator can be traced back through the analysis to a particular business process, which is especially helpful in guiding remedial action, since cause is linked to effect by the method. 相似文献
124.
Muhammad Umar Hamidi Abdul Aziz Mohd. Suffian Yusoff 《Waste management (New York, N.Y.)》2010,30(11):2113-2121
Advanced oxidation processes (AOPs) such as Fenton, electro-Fenton and photo-Fenton have been applied effectively to remove refractory organics from landfill leachate. The Fenton reaction is based on the addition of hydrogen peroxide to the wastewater or leachate in the presence of ferrous salt as a catalyst. The use of this technique has proved to be one of the best compromises for landfill leachate treatment because of its environmental and economical advantages. Fenton process has been used successfully to mineralize wide range of organic constituents present in landfill leachate particularly those recalcitrant to biological degradation. The present study reviews the use of Fenton and related processes in terms of their increased application to landfill leachate. The effects of various operating parameters and their optimum ranges for maximum COD and color removal are reviewed with the conclusion that the Fenton and related processes are effective and competitive with other technologies for degradation of both raw and pre-treated landfill leachate. 相似文献
125.
Mallick Javed Talukdar Swapan Almesfer Mohammed K. Alsubih Majed Ahmed Mohd. Islam Abu Reza Md. Towfiqul 《Environmental science and pollution research international》2022,29(17):25112-25137
Environmental Science and Pollution Research - In Saudi Arabia, identifying homogenous zones based on rainfall patterns is critical for ensuring a predictable and stable water resource and... 相似文献
126.
Nasser Ibrahim Mohammed Ibrahim Mohd Haziman Wan Zuki Sharifah Salwa Mohd Algaifi Hassan Amer Alshalif Abdullah Faisal 《Environmental science and pollution research international》2022,29(11):15318-15336
Environmental Science and Pollution Research - Exposing concrete to high temperatures leads to harmful effects in its mechanical and microstructural properties, and ultimately to total failure. In... 相似文献
127.
The decomposition of sodium dodecylbenzene sulfonate (SDBS) in water by means of ultrasound irradiation at 20kHz was investigated. Experiments were conducted at surfactant concentrations of 175, 260 and 350 mg l(-1), liquid volumes of 120, 170 and 220 ml, temperatures of 20, 30 and 45 degrees C and applied power of 40, 80 and 125 W. The extent of degradation was followed monitoring substrate and organic carbon concentrations, while hydrogen peroxide concentration was also measured; the latter is a product of water sonolysis due to hydroxyl radical recombination. 80% SDBS conversion was achieved after 120 min of sonication at 125 W and 30 degrees C; nonetheless, SDBS and its degradation intermediates proved difficult to oxidise as only about 20-25% of the initial carbon content was transformed to carbon dioxide. At the initial stages of the reaction, degradation rate appears to be only weakly dependent on the substrate concentration with the rate increasing from 3.1 to 4 mg l(-1)min(-1) with increasing concentration from 175 to 350 mg l(-1). Degradation appears to occur at the bubble-liquid interface through hydroxyl radical-mediated reactions whose role was established by performing experiments in the presence of radical scavengers, namely potassium bromide and sodium benzoate. Degradation rates increased with increasing power and decreasing temperature and volume. 相似文献
128.
Salman Abdo Al-Shami Mad Rawi Che Salmah Ahmad Abu Hassan Mohd Nor Siti Azizah 《Environmental monitoring and assessment》2011,177(1-4):233-244
Morphological mentum deformities which represent sublethal effect of exposure to different types of pollutants were evaluated in Chironomus spp. larvae inhabiting three polluted rivers of Juru River Basin in northwestern peninsular Malaysia. Using mentum deformity incidences, the modified toxic score index (MTSI) was developed based on Lenat??s toxic score index (TSI). The suggested MTSI was compared with TSI in terms of its effectiveness to identify different pollutants including heavy metals. The MTSI showed stronger relationship to total deformity incidence expressed as percentage. Additionally, the multivariate RDA model showed higher capability of MTSI to explain the variations in heavy metal contents of the river sediments. The MTSI was recommended in bioassessment of water and sediment quality using the mentum deformities of Chironomus spp. larvae from aquatic ecosystems receiving anthropogenic, agricultural, or industrial discharges. 相似文献
129.
Sarijan Shazani Azman Shamila Said Mohd Ismid Mohd Jamal Mohamad Hidayat 《Environmental science and pollution research international》2021,28(2):1341-1356
Environmental Science and Pollution Research - The utilization of plastics has now become a threat to the environment as it generates microplastic particles (<5 mm in size). The increasing... 相似文献
130.
Abu Bakar Suriani Jusoh Norhafizah Mohamed Azmi Muqoyyanah Muqoyyanah Othman Mohd Hafiz Dzarfan Mamat Mohamad Hafiz Ahmad Mohd Khairul Mohamed Mohd Ambri Azlan Muhammad Noor Hashim Norhayati Birowosuto Muhammad Danang Soga Tetsuo 《Environmental science and pollution research international》2021,28(46):65171-65187
Environmental Science and Pollution Research - In this work, waste cooking palm oil (WCPO)-based carbon nanotubes (CNTs) with encapsulated iron (Fe) nanoparticles have been successfully produced... 相似文献