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排序方式: 共有138条查询结果,搜索用时 62 毫秒
31.
Mohammad Mehdi Amin Nasim Rafiei Parinaz Poursafa Karim Ebrahimpour Nafiseh Mozafarian Bahareh Shoshtari-Yeganeh Majid Hashemi Roya Kelishadi 《Environmental science and pollution research international》2018,25(34):34046-34052
Benzene is a ubiquitous environmental pollutant with various health effects. It is reported that benzene exposure might be associated with insulin resistance in elderly adults. The aim of this study is to investigate the association between urinary benzene metabolite, trans, trans-muconic acid (t,t-ma) and markers of oxidative stress and insulin resistance in children and adolescents. This cross-sectional study was conducted in 2017 among 86 children and adolescents, aged 6–18 years, living in Isfahan, Iran. t,t-ma was measured as urinary benzene metabolite and homeostasis model assessment (HOMA-IR) was determined as an index of insulin resistance. Moreover, malondialdehyde (MDA) and superoxide dismutase (SOD) were assessed as oxidative stress markers. We found significant association between insulin resistance, fasting blood glucose, and fasting blood insulin with t,t-ma (p values?=?0.002, 0.03, and 0.001, respectively). Results of this study indicate that benzene metabolite in higher concentrations in comparison with lower concentrations is associated with increased risk of insulin resistance. Moreover, after adjustment for age, sex, and household passive smoking, statistically significant increase were documented in SOD and MDA (4.49- and 3.54-fold, respectively) in intermediate levels of t,t-ma vs. low levels of t,t-ma (p values?=?0.01 and 0.034, respectively). To the best of our knowledge, this is the first study in its kind in the pediatric age group. It showed that benzene exposures, even in environmental levels, might be associated with insulin resistance and oxidative stress in children and adolescents. Further longitudinal studies are necessary to assess the clinical impacts of this finding. 相似文献
32.
Seyyed Alireza Mousavi Iraj Shahbazi Rastegar Veysinejad Ali Asgar Sobhani Mehdi Bakhti 《中国人口.资源与环境(英文版)》2017,15(4):351-356
In this study, the volume and the cash value of water loss, and reduction of water loss as a result of enforcement action during 2011–2013 in the drinking water network of villages in Kermanshah Province, Iran, have been investigated. Date collected by referring to the different parts of rural water and waste water company of Kermanshah Province and checklist were completed. The study showed the volume of produced water and sold water has increased and the water loss percentage has decreased. High cost of water production compared to revenue of sold water and water loss resulted in significant detriments in terms of the water production costs. Water loss level decreased from 33% to 30% as result of measures taken to reduce water loss but, it is still 15% higher than the world average level. Also the reduction in number of water resources and increase in the number and volume of reservoirs indicates a lack of water and a growing need. As result of high water loss, waste of costs in the contrast of water production cost and also because physical water loss accounts for most of the water loss of villages, necessary measures can be effective in reducing loss and have economic justification. 相似文献
33.
Contamination by organochlorine compounds in the edible tissue of four sturgeon species from the Caspian Sea (Iran) 总被引:1,自引:0,他引:1
Hosseini SV Behrooz RD Esmaili-Sari A Bahramifar N Hosseini SM Tahergorabi R Hosseini SF Feás X 《Chemosphere》2008,73(6):972-979
This study focused on accumulation of organochlorine compounds (OCs), including dichloro-diphenyl-trichloroethanes (DDTs), hexachlorobenzene (HCB), hexachlorocyclohexanes (HCHs), and polychlorinated biphenyls (PCBs) accumulation in the muscle of four sturgeon (Persian sturgeon, Acipenser persicus; Stellate sturgeon, Acipenser stellatus; Ship sturgeon, Acipenser nudiventris and Beluga sturgeon, Huso huso) from the southern Caspian Sea. The DDT group was prominent in all of the sturgeon muscle tested constituting almost half or more of the total organochlorine content. Contaminant concentration generally followed this order: DDTs>PCBs>HCHs>HCB. The OCs concentrations in Beluga sturgeon (H. huso) were the highest and over four times higher than in the next highest species (A. nudiventris). From an ecotoxicological point of view, the concentrations of OCs in experimental fishes do not reflect a comparatively clean and pollution-free environment; however, results from this study shown that the inflow of organic pollutants into the Caspian Sea has been reduced when compared with prior studies. Levels of measured OCs in sturgeon were relatively low, but the level of some OCs in some of the specimens tested exceeded the guidelines for food; therefore, the maximum allowable daily consumption rate for sturgeon from this watershed may be limited by DDTs and PCBs content for high risk populations. 相似文献
34.
Effect of the water–oil ratio on brine/surfactant/alcohol/oil systems optimized for soil remediation
The optimum middle-phase microemulsion used for remediation of oily contaminated soils is often obtained by mixing a certain
amount of a surfactant/alcohol mixture with oil and adjusting the salinity concentrations at a constant water–oil ratio. Upon
introduction to the subsurface, however, the system may not be in the optimum state throughout the remediation process owing
to the change in the water–oil ratio. This research has attempted to investigate the effect of the water–oil ratio on the
phase behavior of systems containing brine, anionic surfactant, alcohols, and different oils. By systematically changing the
water–oil ratio, while keeping the others variables constant, the systems exhibited different phase behavior. The results
revealed that the effect of the water–oil ratio on system behavior was significant, and analogous to that of salinity. Increasing
the water–oil ratio led the system change from winsor I → winsor III → winsor II. The greater the water–oil ratio the lower
the salinity required to produce the middle-phase microemulsion, but the narrower the salinity range of the three-phase region.
An empirical correlation has been developed in order to predict the changes in phase behavior with the changes in water–oil
ratio. This provides a useful tool for designing optimum formulations suitable for soil remediation.
Received: October 5, 1999 / Accepted: March 27, 2000 相似文献
35.
36.
Ali Asghar Tofigh Mohammad Reza Rahimipour Mohsen Ostad Shabani Mehdi Alizadeh Fatemeh Heydari Ali Mazahery Mansour Razavi 《Journal of Manufacturing Processes》2013,15(4):518-523
In this research, an experimental study of reinforcing alumina nano-particles into the aluminum alloy matrix was implemented to verify the accuracy of modeling results obtained by feed forward neural networks. Artificial neural network combined with numerical technique were used to predict the various parameters of mechanical properties such as hardness, tensile and compressive yield stress, UTS and elongation percentage. Much experimentation were taken to discover a suitable number of hidden neurons, avoid detraction from the trainability and enable feed forward neural networks to solve more complex problems. The predictions were found to be consistent with experimental measurements. 相似文献
37.
Mirsadeghi Somayeh Zandavar Hamed Tooski Hamed Farhad Rahimi Mostafa Sohouli Esmail Rahimi-Nasrabadi Mehdi Ganjali Mohammad Reza Pourmortazavi Seied Mahdi 《Environmental science and pollution research international》2021,28(5):5430-5442
Environmental Science and Pollution Research - We reported the tin (II) tungstate nanoparticles as the photocatalyst and sensor modifier that were synthesized via chemical precipitation reaction... 相似文献
38.
Mehdi Bidabadi Saeedreza Zadsirjan Seyed Alireza Mostafavi 《Journal of Loss Prevention in the Process Industries》2013,26(1):172-176
This article has investigated the propagation and extinction of aluminum dust cloud flame in a narrow channel. The burned and burning dust particles act as heat sources and the channel walls act as heat sinks. In this method, discrete heat source has been used to analyze dust combustion in a narrow channel. Using the superposition of sources and sinks, the preheat zone temperature is predicted as an indicator of flame propagation or extinction. Dust concentration and channel width are two major parameters which affect the quenching distance and flame propagating speed. Wall temperature affects the heat loss; and by preheating the walls, quenching distance is reduced and flame propagation speed is increased. 相似文献
39.
Mohammad Mehdi Amin Bijan Bina Amir Masoud Samani Majd Hamidreza Pourzamani 《Frontiers of Environmental Science & Engineering》2014,8(3):345-356
Benzene removal evaluated using Fe304 nano continuous condition. A 44 initial benzene concentration, from aqueous solutions was magnetic particles (NM) in factorial design including NM dose, contact time and pH was investigated in 16 experiments (Taguchi OA design). The results indicated that all factors were significant and the optimum condition was: pH 8, NM dose of 2000 mg.L-1, benzene concentrations of 100 mg.L-1 and contact time of 14min. The maximum benzene uptake and distribution ratio in the optimum situation were 49.4mg.g-1 and 38.4L.g-1, respectively. The nano particles were shown to capture 98.7% of the benzene in optimum batch condition and 94.5% in continuous condition. The isotherm data proved that the Bmnauer-Emmett-Teller model fit more closely and produced an isotherm constant (b) less than one, indicating favorable adsorption. Regeneration studies verified that the benzene adsorbed by the NM could be easily desorbed by temperature, and thereby, NM can be employed repeatedly in water and wastewater management. 相似文献
40.
The effect of biochar on severity of soil water repellency of crude oil-contaminated soil 总被引:2,自引:0,他引:2
Ebrahimzadeh Omran Samaneh Shorafa Mehdi Zolfaghari Ali Asghar Soltani Toolarood Ali Ashraf 《Environmental science and pollution research international》2020,27(6):6022-6032
Environmental Science and Pollution Research - Crude oil contamination adversely affects soil water repellency. In this study the effect of biochar on this soil characteristic has been investigated... 相似文献