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91.
Amin U. Khan 《Environmental monitoring and assessment》2010,168(1-4):121-131
This paper provides a framework for the managers to devise means to protect, restore, and maintain the remaining bi-species groves for sustainable management of fragile arid land ecosystem. At the moment, there is no information available about the structural and functional ecology of these dwindling remnants. The selection criteria for the classification of the groves are based on understanding the positive association between the two species, Prosopis cineraria and Salvadora oleoides, in terms of spatial pattern and morphological features. It was achieved by highlighting the attributes of the benchmark grove and classification of other groves in reference to it. The results clearly show that positive association in the groves is due to differences in the growth strategies of the two species in terms of above- and belowground biomass allocation and architecture. Most of the groves are in various stages of degradation, and anthropogenic interferences are the major determinant linked with the declining status of the groves. These activities affect the complimentary attributes of the bi-species groves, thus disturbing the characteristic structural features which contributed to the stability of this fragile landscape. 相似文献
92.
Sayed?Mahdi?ZandiEmail authorView authors OrcID profile Amin?Rafizadeh Ahamd?Shanehsazzadeh 《Environmental Fluid Mechanics》2017,17(5):1015-1034
A meshless method based on exponential basis functions (EBFs) is developed to simulate the propagation of solitary waves and run-up on the slope. The presented method is a boundary-type meshless method applying the exponential basis functions with complex exponents. The solution of governing equations is considered as a series of these basis functions. Boundary conditions are satisfied through a point-wise collocation approach. Based on the presented EBF meshless method, a new formula is introduced for the maximum run-up height on different slopes, valuable for engineering applications. The results obtained through the numerical method in the prediction of solitary wave propagation and estimation of run-up are verified through the comparison with experimental data. The comparison with 159 experimental data indicates that this new formula is more accurate than the preceding formulas in predicting the maximum run-up of non-breaking solitary waves. Minimum calculation time and convenient performances are the other advantages of this method. 相似文献
93.
Contamination of freshwater by estrogens from manure applied to agricultural land is of grave concern because of the potentially harmful effects on aquatic life and human health. Recent developments in liquid manure (slurry) management include partial removal of particulate slurry dry matter (PSDM) by separation technologies, which may also remove parts of the estrogens and enhance infiltration of the slurry on field application and hence the interaction between estrogens and the soil matrix. This study investigated how 17β-estradiol (E2), a natural estrogen commonly found in pig manure, sorbs to agricultural soils, to different size fractions of pig slurry separates, and to soils amended with each size fraction to simulate conditions in the soil-slurry environment. A crude fiber fraction (SS1) was prepared by sieving (<500 μm) the solids removed by an on-farm separation process. Three other size fractions (SS2 > SS3 > SS4) were prepared from the liquid fraction of the separated slurry by sedimentation and centrifugation. Sorption experiments were conducted in 0.01 mol L(-1) CaCl(2) and in natural pig urine matrix. Sorption in 0.01 mol L(-1) CaCl(2) was higher than that in pig urine for all solids used. Sorption of E2 to soil increased with its organic carbon content for both liquid phases. The solid-liquid partition coefficients of slurry separates were 10 to 30 times higher than those of soils, but the organoic carbon normalized partition coefficient values, reflecting sorption per unit organic carbon, were lower for slurry separates. Mixing slurry separates with soil increased the sorption of E2 to the solid phase significantly in the order: SS1 < SS3 < SS2 for both liquid phases. In contrast, SS4 reduced the sorption of E2 to the solid phase by increasing the sorption to suspended or dissolved organic matter. The study suggested that potentially 50 to 75% of E2 in slurry can be removed from the liquid fraction of slurry by physical separation. 相似文献
94.
This study reviews research on cash and voucher assistance (CVA) by applying a humanitarian supply chain management perspective. A systematic literature review was conducted to identify, analyse, and synthesise past academic research. The content, context, and process framework was used to structure the content analysis. The findings reveal that the outcomes of CVA programmes are dependent on critical context-specific variables that influence feasibility and operability. Humanitarian actors must consider factors that are external (the nature of disaster, politics, economy, and infrastructure) and internal (local market availability and accessibility, supplier/donor interest, supplier/vendor selection and contracting, and beneficiary preference) to the supply chain. The delivery process is influenced by them, impacting on programme responsiveness and cost-efficiency. The results provide insights that humanitarian practitioners can utilise to reconsider their supply chain strategies when deciding on the selection and implementation of CVA programmes. Potential literature gaps are identified, and recommendations for further research are provided. 相似文献
95.
Wang Xianbin Wang Ting Pan Tingting Huang Mei Ren Weihua Xu Geliang Amin Hatem K. Kassab Rami B. Abdel Moneim Ahmed E. 《Environmental science and pollution research international》2020,27(6):5981-5992
Environmental Science and Pollution Research - Senna alexandrina is traditionally used for its antioxidant and anti-inflammatory properties, but little information is available concerning its... 相似文献
96.
Basit Abdul Amin Noor Ul Shah Syed Tanveer Ahmad Imran 《Environment, Development and Sustainability》2022,24(9):11424-11448
Environment, Development and Sustainability - Conservation of greenbelts is the most enduringly successful and popular basic need for today to protect green land, preserve ecological landscape and... 相似文献
97.
Mitigation of climate change impacts on maize productivity in northeast of Iran: a simulation study 总被引:1,自引:0,他引:1
Azam Lashkari Amin Alizadeh Ehsan Eyshi Rezaei Mohammad Bannayan 《Mitigation and Adaptation Strategies for Global Change》2012,17(1):1-16
Development and evaluation of mitigation strategies are fundamental to manage climate change risks. This study was built on
(1) quantifying the response of maize (Zea mays L.) grain yield to potential impacts of climate change and (2) investigating the effectiveness of changing sowing date of
maize as a mitigation option for Khorasan Province which is located in northeast of Iran. Two types of General Circulation
Models (GCM: (United Kingdom Met Office Hadley Center :HadCM3) and (Institute Pierre Simon Laplace: IPCM4)) and three scenarios
(A1B, A2 and B1) at four locations (Mashhad, Birjand, Bojnourd and Sabzevar) employed in this study. Long Ashton Research
Station-Weather Generator (LARS-WG) was employed for generating the future climate. The Cropping System Model (CSM)-CERES-Maize
was used for crop growth simulation under projected climate conditions. The results showed the simulated grain yields of maize
gradually would decrease (from −1% to −39%) during future 100 years compared to baseline under different scenarios and two
GCM at all study locations. The simulation results suggested that delayed sowing date from May to June at all study locations,
except Sabzevar location is the most effective mitigation option for avoiding thermal stress at end of growth period. In addition,
shifting in sowing date to March or April will be beneficial in terms of obtaining higher yields in Sabzevar. Grain yield
did not show special trend from north to south of Khorasan Province in the future climate. In general, change of sowing date
may be quite beneficial to mitigate climate change impacts on grain yield of maize in northeast of Iran. 相似文献
98.
Oscar Amin Laura Comoglio Carla Spetter Claudia Duarte Ra��l Asteasuain Rub��n Hugo Freije Jorge Marcovecchio 《Environmental monitoring and assessment》2011,175(1-4):63-73
The study deals with the determination of physico-chemical parameters, inorganic nutrients, particulate organic matter, and photosynthetic pigments on a monthly basis during an annual cycle from nine sampling sites of the coastal zone of a high-latitude ecosystem (Tierra del Fuego, Argentina). Nitrites and phosphates concentrations were similar to other systems of the south Atlantic coast (median, 0.30 and 1.02 ??M, respectively), while nitrates were higher in all sampling periods (median, 45.37 ??M), and silicates were significantly smaller (median, 7.76 ??M). Chlorophyll a and phaeopigments have shown median values of 0.38 and 0.85 mg m???3, respectively, while saturated values of dissolved oxygen were recorded throughout the study. The analysis reflected that nutrient enrichment seems to be linked to an anthropogenic source, the presence of peatlands areas, and a sink of Nothofagus pumilio woods. The area could be characterized in three zones related to (1) high urban influence, (2) natural inputs of freshwater, and (3) mixed inputs coming from moderate urban impacts. 相似文献
99.
Jan Amin Ullah Hadi Fazal Shah Abdullah Ditta Allah Nawaz Muhammad Asif Tariq Muhammad 《Environmental science and pollution research international》2021,28(32):43417-43430
Environmental Science and Pollution Research - Soil pollution due to potentially toxic elements is a worldwide challenge for health and food security. Chelate-assisted phytoextraction along with... 相似文献
100.
Ataei Seyed Milad Aghayan Iman Pouresmaeili Mohammad Amin Babaie Meisam Hadadi Farhad 《Environmental science and pollution research international》2022,29(4):5105-5123
Environmental Science and Pollution Research - The drive mode is an important factor that affects the adjustment requirements for emission factors of the conventional simulation methods in... 相似文献