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排序方式: 共有272条查询结果,搜索用时 46 毫秒
81.
Peyman Amir Nazmi Afshar Mehdy Gooya Seyed Vahid Hosseini 《International Journal of Green Energy》2017,14(11):868-877
The study deals with the design and optimization of external and internal geometry of micro-wind turbines blades. A specified objective function which consists of the power coefficient and the starting time was defined and the genetic algorithm optimization technique in conjunction with the blade-element momentum theory was adopted to find the geometry of the blades including the distributions of the chord, the twist angle and also the shell thickness. Moreover, the allowable stress of the blades was considered as a constraint to the objective function. Results show that a reasonable compromise is achievable such that the starting time of the blades reduces noticeably in return for a small drop in the power coefficient. The significant improvement of the hollow blades over the solid ones indicates that the power coefficient and the starting performance could be improved through the appropriate distributions of the considered decision variables, i.e. the chord, the twist angle and also the shell thickness. 相似文献
82.
Jahangir Mohammad Hossein Mousavi Seyed Ali Asayesh Zarchi Ruhollah 《Environment, Development and Sustainability》2021,23(10):14494-14527
Environment, Development and Sustainability - The tourism sectors consume a high amount of electrical power, which in most cases is supplied by the electrical grid and diesel generator. As a... 相似文献
83.
Karimi Pouria Azarpira Hossein Rasolevandi Tayebeh Sarkhosh Maryam Azizi Shohreh Mohseni Seyed Mohsen Sadani Mohsen 《Environmental science and pollution research international》2023,30(6):14630-14640
Environmental Science and Pollution Research - In this study, simultaneous removal of an organic matter (diazinon, DIZ) and an inorganic substance (chromium, Cr) was used. Breaking down of organic... 相似文献
84.
Groundwater and water resources management play a key role in conserving the sustainable conditions in arid and semi-arid
regions. Applying some techniques that can reveal the critical and hot conditions of water resources seem necessary. In this
study, kriging and cokriging methods were evaluated for mapping the groundwater depth across a plain in which has experienced
different climatic conditions (dry, wet, and normal) and consequently high variations in groundwater depth in a 12 year led
in maximum, minimum, and mean depths. During this period groundwater depth has considerable fluctuations. Results obtained
from geostatistical analysis showed that groundwater depth varies spatially in different climatic conditions. Furthermore,
the calculated RMSE showed that cokriging approach was more accurate than kriging in mapping the groundwater depth though there was not a distinct
difference. As a whole, kriging underestimated the real groundwater depth for dry, wet, and normal conditions by 5.5, 2.2,
and 5.3%, while cokriging underestimations were 3.3, 2, and 2.2%, respectively; which showed the unbiasedness in estimations.
Results implied that in the study area farming and cultivation in dry conditions needs more attention due to higher variability
in groundwater depth in short distances compared to the other climate conditions. It is believed that geostatistical approaches
are reliable tools for water resources managers and water authorities to allocate groundwater resources in different environmental
conditions. 相似文献
85.
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
86.
87.
Seyed Hashem Mousavi-Avval Shahin RafieeAli Jafari Ali Mohammadi 《Journal of Cleaner Production》2011,19(13):1464-1470
This study examines energy use patterns and the relationship between energy inputs and yield for canola production in Golestan province of Iran. Data used in this study were obtained from 130 randomly selected canola farms using a face to face survey. The results revealed that total energy of 17,786.36 MJ ha−1 was required for canola production and fertilizer, diesel fuel and electricity were the main energy consuming inputs. Energy use efficiency and energy productivity were 3.02 and 0.12 kg MJ−1, respectively. Moreover, in specifying a functional relationship the Cobb-Douglas production function was applied and the results showed that machinery, fertilizer, diesel fuel and water for irrigation energies significantly contributed to yield. Also, the marginal physical productivity (MPP) technique was applied to analyze the sensitivity of energy inputs. It was found that, canola production had more sensitivity on machinery, fertilizer and water for irrigation energies; so that an additional use of 1 MJ from each of the machinery, total fertilizer and water for irrigation would lead to an increase in production by 0.93, 0.61 and 0.24 kg, respectively. However, electricity and seed energies were contributed negatively to yield, which may result in inverse effect on yield and impose risks to the environment. 相似文献
88.
Hossein Kakooei Seyed Jamaleddin Shahtaheri Hossein-Ali Karbasi 《International journal of occupational safety and ergonomics》2006,12(4):443-449
Evaluation of personal inhalation exposure to methylene diphenyl diisocyanate (MDI) among 39 employees, working in the window fixation and window glue processes in an automobile manufacturing company was performed. This study was conducted for both case and control groups. After sampling and sample preparation processes, MDI was determined with a UV-VIS spectrophotometer at 590 nm; the lung function was assessed with a digital spirometer, too. The average concentration of MDI in the window fixation, and window glue workplaces were 34.53 and 27.37 micro g/m3, respectively, which was lower than the threshold limit value (TLV) recommended by the American Conference of Governmental Industrial Hygienists (ACGIH) (51 micro g/m3). Respiratory symptoms in the exposed group were significantly different compared to the unexposed group (p < .05). Lung capacities in the case group were lower than in the control group (p < .05). Therefore, MDI can be easily measured making it possible to evaluate the adverse effects caused by occupational exposure. 相似文献
89.
The potential of pennywort(Hydrocotyle vulgaris)for phytoremediation of C.I.Acid Blue 92(AB92)was evaluated.The efects of various experimental parameters including pH,temperature,dye concentration and plant weight on dye removal efciency were investigated.The results showed that the optimal condition for dye removal were pH 3.5 and temperature 25°C.Moreover,the absolute dye removal enhanced with increase in the initial dye concentration and plant weight.Pennywort showed the same removal efciency in repeated experiments(four runs)as that obtained from the first run(a 6-day period).Therefore,the ability of the plant in consecutive removal of AB92 confirmed the biodegradation process.Accordingly,a number of produced intermediate compounds were identified.The efect of treatment on photosynthesis and antioxidant defense system including superoxide dismutase,peroxidase and catalase in plant roots and leaves were evaluated.The results revealed a reduction in photosynthetic pigments content under dye treatments.Antioxidant enzyme responses showed marked variations with respect to the plant organ and dye concentration in the liquid medium.Overall,the increase in antioxidant enzyme activity under AB92 stress in the roots was much higher than that in the leaves.Nevertheless,no significant increase in malondialdehyde content was detected in roots or leaves,implying that the high efciency of antioxidant system in the elimination of reactive oxygen species.Based on these results,pennywort was founded to be a capable species for phytoremediation of AB92-contaminated water,may be efective for phytoremediation dye-contaminated polluted aquatic ecosystems. 相似文献
90.
Hadei Mostafa Mesdaghinia Alireza Nabizadeh Ramin Mahvi Amir Hossein Rabbani Shahram Naddafi Kazem 《Environmental science and pollution research international》2021,28(11):13055-13071
Environmental Science and Pollution Research - This study has systematically reviewed all of the research articles about the photocatalytic degradation of pesticides using titanium dioxide (TiO2)... 相似文献