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排序方式: 共有145条查询结果,搜索用时 31 毫秒
81.
Recycled Natural Fiber Polypropylene Composites: Water Absorption/Desorption Kinetics and Dimensional Stability 总被引:1,自引:0,他引:1
Detailed analysis of the effects of recycling process on long-term water absorption, thickness swelling and water desorption
behavior of natural fiber polypropylene composites is reported. Composite materials containing polypropylene and wood flour,
rice hulls or bagasse fibers were produced at constant fiber loading and were exposed to a simulated recycling process consisting
of up to five times grinding and reprocessing under controlled conditions. A wide range of analytical methods including water
absorption/desorption tests, thickness swelling tests, density measurement, scanning electron microscopy, image analysis,
contact angle, fiber length analysis and Fourier transform infrared spectroscopy was employed to understand the hygroscopic
behavior of the recycled composites. Water absorption and thickness swelling behaviors were modeled using existing predictive
models. Results indicated that generally the recycled composites had considerably lower water absorption and thickness swellings
as compared with the original composites which were attributed to changes in physical and chemical properties of the composites
induced by the recycling process. 相似文献
82.
Environmental Fluid Mechanics - For many environmental projects and plans, it is necessary to model pollutant transport in rivers. Pollutant transport modeling is a complex phenomenon with multiple... 相似文献
83.
Torkashvand Javad Rezaei Kalantary Roshanak Heidari Neda Kazemi Zohre Kazemi Zahra Farzadkia Mahdi Amoohadi Vida Oshidari Yasaman 《Environmental science and pollution research international》2021,28(35):47741-47751
Environmental Science and Pollution Research - Landfilling is known to be the most widely used method in municipal solid waste management in many countries. Landfill leachate containing different... 相似文献
84.
85.
Shafiey Dehaj Mohammad Ahmadi Mehdi Zamani Mohiabadi Mostafa 《Environmental science and pollution research international》2021,28(5):5316-5331
Environmental Science and Pollution Research - This research was designed to experimentally study the influence of using three metal oxide nanofluids at different high flow rates with various mass... 相似文献
86.
Sepand Mohammad-Reza Aliomrani Mehdi Hasani-Nourian Yazdan Khalhori Mohammad-Reza Farzaei Mohammad-Hosein Sanadgol Nima 《Environmental science and pollution research international》2020,27(30):37488-37501
Environmental Science and Pollution Research - Necroptosis is a regulated cell death that is governed by mixed lineage kinase domain-like, receptor-interacting serine-threonine kinase 3 and... 相似文献
87.
Masoumeh Mohammadi Fereidoun Azizi Mehdi Hedayati 《Environmental geochemistry and health》2018,40(1):87-97
Iodine deficiency is a global public health issue because iodine plays a major role in the thyroid hormone synthesis and is essential for normal neurological development. This review summarizes the publications on iodine status in the WHO Eastern Mediterranean Region (EMR) countries. All related studies available in main national and international databases were systematically searched using some specific keywords to find article published between 1909 and 2015. The prevention of iodine deficiency disorders (IDDs) in the WHO EMR countries is currently under control without significant side effects. Mild to severe IDDs exist in some countries of the Middle East, due to lack of effective iodine supplementation program, but the Islamic Republic of Iran, Jordan, Bahrain and Tunisia have achieved the goal of universal salt iodization. Overall, despite enormous efforts to control IDDs, still IDD remains a serious public health problem in some countries of the region, requiring urgent control and prevention measures. 相似文献
88.
89.
Laure Mamy Pauline Vrignaud Nathalie Cheviron François Perreau Mehdi Belkacem Agathe Brault Sébastien Breuil Ghislaine Delarue Jean-Pierre Pétraud Isabelle Touton Christian Mougin Véronique Chaplain 《Environmental Chemistry Letters》2011,9(1):145-150
Soil is damaged by several threats and, among them, chemical contamination by pesticides and compaction. However, the effect of compaction on the fate of pesticides in soil, and the impact of pesticides on soil biological functioning are unknown. Therefore, we studied the effect of soil compaction on the degradation of the herbicide isoproturon, and the impact of this herbicide on an enzyme activity (β-glucosidase) involved in the C soil cycle. Undisturbed soil samples were prepared at different bulk densities, treated with isoproturon then incubated at 18°C in darkness for 63 days. The results showed that soil compaction did not modify significantly the degradation of isoproturon, neither the formation rates nor the nature of its metabolites. Moreover, compaction did not modify the impact of isoproturon on β-glucosidase activity. To our knowledge, these are the first results concerning the interactions between soil compaction and the degradation and impact of a pesticide. 相似文献
90.
Rooholla Moradi Alireza Koocheki Mehdi Nassiri Mahallati 《Mitigation and Adaptation Strategies for Global Change》2014,19(8):1223-1238
Adaptation is a key factor for reducing the future vulnerability of climate change impacts on crop production. The objectives of this study were to simulate the climate change effects on growth and grain yield of maize (Zea mays L.) and to evaluate the possibilities of employing various cultivar of maize in three classes (long, medium and short maturity) as an adaptation option for mitigating the climate change impacts on maize production in Khorasan Razavi province of Iran. For this purpose, we employed two types of General Circulation Models (GCMs) and three scenarios (A1B, A2 and B1). Daily climatic parameters as one stochastic growing season for each projection period were generated by Long Ashton Research Station-Weather Generator (LARS?WG). Also, crop growth under projected climate conditions was simulated based on the Cropping System Model (CSM)-CERES-Maize. LARS-WG had appropriate prediction for climatic parameters. The predicted results showed that the day to anthesis (DTA) and anthesis period (AP) of various cultivars of maize were shortened in response to climate change impacts in all scenarios and GCMs models; ranging between 0.5 % to 17.5 % for DTA and 5 % to 33 % for AP. The simulated grain yields of different cultivars was gradually decreased across all the scenarios by 6.4 % to 42.15 % during the future 100 years compared to the present climate conditions. The short and medium season cultivars were faced with the lowest and highest reduction of the traits, respectively. It means that for the short maturing cultivars, the impacts of high temperature stress could be much less compared with medium and long maturity cultivars. Based on our findings, it can be concluded that cultivation of early maturing cultivars of maize can be considered as the effective approach to mitigate the adverse effects of climate. 相似文献