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排序方式: 共有44条查询结果,搜索用时 15 毫秒
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22.
Sun Hui Zhang Hengyuan Mao Huimin Yu Bin Han Jian Bhat Gajanan 《Environmental Chemistry Letters》2019,17(2):1091-1096
Environmental Chemistry Letters - Dyeing wastewaters present high hazards for the environment and human health. Advanced dye removal may be achieved by magnetic metal–organic frameworks... 相似文献
23.
Gajanan Bhat John Bergstrom R. Jeff Teasley J. M. Bowker H. Ken Cordell 《Environmental management》1998,22(1):69-77
/ This paper describes a framework for estimating the economic value of outdoor recreation across different ecoregions. Ten ecoregions in the continental United States were defined based on similarly functioning ecosystem characters. The individual travel cost method was employed to estimate recreation demand functions for activities such as motor boating and waterskiing, developed and primitive camping, coldwater fishing, sightseeing and pleasure driving, and big game hunting for each ecoregion. While our ecoregional approach differs conceptually from previous work, our results appear consistent with the previous travel cost method valuation studies.KEY WORDS: Recreation; Ecoregion; Travel cost method; Truncated Poisson model 相似文献
24.
Hybridized Biocomposites from Agro-Wastes: Mechanical,Physical and Thermal Characterization 总被引:1,自引:0,他引:1
Irshad-Ul-Haq Bhat H. P. S. Abdul Khalil M. R. Nurul Fazita C. K. Abdullah 《Journal of Polymers and the Environment》2011,19(1):49-58
Agricultural wastes, oil palm trunk (OPT) veneer and oil palm empty fruit bunch (EFB) mat were used for the preparation of
hybridized plywood using 250 and 450 g/m2 of urea formaldehyde (UF) as gluing agent. The mechanical (flexural strength, flexural modulus, screw withdrawal, shear strength),
physical (density, water absorption, thickness swelling and delamination) and thermal (TGA) properties of the biocomposites
were studied. Images taken with a scanning electron micrograph (SEM) indicated an improvement in the fiber–matrix bonding
for the laminated panel glued with 450 g/m2 of UF. 相似文献
25.
A. H. Bhat H. P. S. A. Khalil Irshad ul Haq Bhat A. K. Banthia 《Journal of Polymers and the Environment》2012,20(2):395-403
Red mud emerges as the major waste material during production of alumina from bauxite by the Bayer??s process. Based on economics as well as environmental related issues, enormous efforts have been directed worldwide towards red mud management issues i.e. of utilization, storage and disposal. The present research work has been undertaken with an objective to explore the use of red mud as a reinforcing material in the polymer matrix as a low cost option. The silicate layered red mud was organophilized by aniline formaldehyde and to know the effect of various filler loading on the material properties of PVA-organophilized red mud composites, prepared by a conventional solvent casting technique and comparison of the same with that of the virgin poly (vinyl alcohol) (PVA), various characterizations was done. The modified red mud was typically characterized by X-ray diffraction. The X-ray diffraction pattern of the composite materials was also studied. The morphological image of the composite materials was studied by scanning electron microscopy (SEM). Transmission electron microscopy (TEM) was used to characterize the dispersion of the red mud within the composite materials. The surface topography of the composite materials was studied by Atomic Force Microscopy (AFM). The dielectric properties of composite materials were investigated in wide frequency ranges from 1?MHz to 1?GHz. 相似文献
26.
Assadullah Insaaf Zaman M Burhanuz Malik Khurshaid Ahmad Malik Javied Hamid Bhat Aadil Ahmad Tomar Radha 《Environmental science and pollution research international》2021,28(4):3953-3959
Environmental Science and Pollution Research - Chalcogenide nanostructures are the materials with diverse applications. Here, we report rapid hydrothermal synthesis of crystalline ZnSe quantum dots... 相似文献
27.
Dig Vijay Singh Javeed Iqbal Ahmad Bhat Rouf Ahmad Bhat Moonisa Aslam Dervash Sartaj Ahmad Ganei 《Environmental monitoring and assessment》2018,190(6):353
In an effort to determine vehicular impact on soil quality, soil samples were collected from three different zones (Pahalgam, Batakote, and Chandanwari) in Pahalgam forest ecosystem. Results showed that a significant decrease in moisture content, organic carbon, available nitrogen, and potassium was observed in nearby road side soils. However, pH was observed to be on neutral side and available phosphorus recorded high concentration. The concentration of heavy metals Pb2+, Cu2+, Zn2+, Ni2+, and Cd2+ estimated was also significantly high. Furthermore, concentration of Pb2+ at high vehicular load subzones was observed to be highest (1.168 mg/Kg) followed by Zn2+ (0.896 mg/Kg), Ni2+ (0.649 mg/Kg), Cu2+ (0.415 mg/Kg), and Cd2+ (0.079 mg/Kg). An inter-zone analysis revealed that the concentration of the heavy metals (Pb2+?>?Ni2+?>?Cd2+) was observed to follow the trend, Z-I?>?Z-II?>?Z-III. Variation along the temporal gradient and the impact on soil qualities were notably higher in summer. Vehicular pollution to a great extent impacts physico-chemical characteristics and more interestingly adds substantial concentration of heavy metals in soils. 相似文献
28.
29.
Ravindranath N. H. Bhat P. R. 《Mitigation and Adaptation Strategies for Global Change》1997,2(2-3):217-230
The forestry sector is being increasingly considered for abatement of greenhouse gases. A number of projects are likely to be implemented, particularly in tropical countries. It is essential to measure, record, and verify the carbon sequestered or emission avoided due to implementation of the forestry mitigation options. In this paper a set required parameters to be monitored for estimating carbon flows, monitoring methods, and institutional arrangements are presented along with a case study of the Western Ghat Forestry and Environment project. Monitoring carbon flows in forestry sector projects is different due to a long gestation period and location- or site-specific variations in various parameters, particularly rates of C sequestration and emission. Parameters to be monitored include C sequestration in vegetation and soil, rates of wood extraction, wood use related emission, litter, production, decomposition from litter, and soil. Methods include field vegetation monitoring, soil study, houschold and industry surveys, and laboratory investigation. Investigations, analysis, and report writing should be carried out using local educational institutions, NGOs, and consultaney firms. Verification could be taken care of by external agencies. Case studies of the Western Ghat Forestry and Environment project showed that less than 10% of the project budget may be adequate for intensive monitoring of carbon flows. The parameters to be monitored and methods required for any forestry mitigation project is nearly identical to that of any typical forest conservation or reforestation project. 相似文献
30.
Sartaj Ahmad Bhat Jaswinder Singh Adarsh Pal Vig 《Environmental science and pollution research international》2014,21(13):8112-8123
Genotoxicity of pressmud (PM) to Allium cepa was investigated to assess its toxic potential and to elucidate the effect of vermicomposting to reduce its toxicity. The PM produced as a waste by product of the sugar cane industry was mixed with cow dung (CD) at different ratios of 0:100 (V0), 25:75 (V25), 50:50 (V50), 75:25 (V75) and 100:0 (V100) (PM:CD) on a dry weight basis for vermicomposting with Eisenia fetida. Different concentrations of 100 % PM sludge extract (10 %, 20 %, 40 %, 60 %, 80 % and 100 %) and negative control (distilled water) and positive control (maleic hydrazide) were analyzed with A. cepa assay to evaluate frequency of chromosomal aberrations before and after vermicomposting. Percent aberration was greatest (30.8 %) after exposure to 100 % PM extract after 6 h but was reduced to 20.3 % after vermicomposting. Exposure to the extract induced c-mitosis, delayed anaphase, laggards, stickiness and vagrant aberrations. Microscopic examination of root meristem exposed to PM sludge extract showed significant inhibition of mitotic index. Also, the mitotic index decreased with increase in concentration of PM sludge extract. After vermicomposting the mitotic index was increased. However, increasing percentages of PM significantly affected the growth and fecundity of the worms and maximum population size was reached in the 25:75 (PM:CD) feed mixture. Nitrogen, phosphorus, sodium, electrical conductivity (EC) and pH increased from initial feed mixture to the final products (i.e., vermicompost), while organic carbon, C/N ratio and potassium declined in all products of vermicomposting. Scanning electron microscopy (SEM) was recorded to identify the changes in texture with numerous surface irregularities and high porosity that proves to be good vermicompost manure. It could be concluded that vermicomposting could be an important tool to reduce the toxicity of PM as evidenced by the results of genotoxicity. 相似文献