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- 저자 : Enayet Hossain (검색결과 2 건)
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Mohammad Enayet Hossain,Saif Shahrukh,Muhammad Nurul Huda,Md. Mominul Islam,Shahid Akhtar Hossain 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
Urban air quality is one of the major issues in cities worldwide, with airborne particulate matter (PM) being recognized as one of the most harmful pollutants vis-à-vis human health. In cities, roadside vegetation is exposed to all types of air pollutants, including a wide variety of particulates-borne toxic compounds. Information on plants’ tolerance towards air and PM pollution and plant-pollutant interactions is vital for screening of suitable stress-tolerant plants as a sustainable green-filtration unit. An investigation was undertaken to assess the tolerance or sensitivity of four roadside trees (Ficus benghalensis, Ficus religiosa, Mangifera indica, and Polyalthia longifolia) towards air pollutants, including particulates. The four species were sampled from four different locations of Dhaka, Bangladesh. Air pollution tolerance index (APTI) was assessed using the total chlorophyll content, ascorbic acid content, relative water content, and the pH of the extract from the leaves of the studied plants. The results were compared with similar species at a non-polluted site in a nearby area having a similar soil-climate complex. Concentration of selected biochemical parameters was found to be lower in some plant species grown at the polluted site than at the non-polluted site. The total chlorophyll content showed a decreasing trend with the increasing particulate matter loads. Different tolerance orders of species were found at the four sampling sites, which was possibly due to the varying level of air pollution in those sampling sites. APTI of the investigated plants ranged from 10.31 to 12.51 meaning they were either sensitive or intermediately tolerant. M. indica was found to be intermediately tolerant in three sampling sites. The results indicated that these evergreen species are good indicators of air pollution and can be used as an early warning tool for air pollution level that is harmful to human health. Anticipated performance index (API) was also calculated to assess the overall performance of a plant in a particular region where some socioeconomic and biological characteristics were taken into consideration. From the API, M. indica achieved the highest score (68.75%) amongst the selected plant species irrespective of different sites. The accumulation of heavy metals (Cd, Cr, Pb, and Ni) on the leaves of four tree species were investigated, and a predictive foliar metal accumulation index (MAI) was developed. F. benghalensis was found to have the highest MAI value (13.60). Based on these three indices, the most suitable plant species for green belt development in urban areas were identified and recommended for long-term air pollution management.
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I. N. Esha,Md. Al-Amin,F. T. Z. Toma,Enayet Hossain,M. N. I. Khan,Kazi Hanium Maria 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5
Conventional double sintering ceramic method has been followed to prepare a series of Eu substituted Ni0.4Zn0.45Cu0.15Fe(2-x) EuxO4 (NZCFEO) ferrites with x = 0.00, 0.02, 0.04, 0.07, 0.10, 0.12, 0.15. X-ray diffraction peaks confirm the single phase cubic spinel structures of all the samples. The lattice parameter is found to be distorted with the addition of Eu into the samples. X-ray density and bulk density increase with the increase of Eu content. Better crystallization has been obtained with the decreasing porosity as a result of increasing Eu3+ concentration. The dielectric constant of the samples shows a decreasing trend while both AC and DC resistivities are observed to increase with the increase of Eu3+ concentration. The high resistivity offers greater value of the activation energy. Permeability is found to decrease with increasing Eu content. Saturation magnetization changed significantly with Eu3+ concentration. Noteworthy decrease of the Curie temperature is observed with the addition of Eu substituent.
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