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81.
Ahmad Firoz Uddin Md Meraj Goparaju Laxmi Talukdar Nazimur Rahman Rizvi Javed 《Environment, Development and Sustainability》2021,23(10):15183-15203
Environment, Development and Sustainability - The study utilized the tree covers per cent, agroforestry suitability, present and future (2050) climate, agriculture vulnerability (2050), percentage... 相似文献
82.
M. M. Rahman Saad Mekhilef R. Saidur A. G. M. Mustayen Billah S. M. A. Rahman 《International Journal of Green Energy》2016,13(4):344-351
This article presents two mathematical models for drying mushrooms considering the shrinkage effect. Both the models consider the physical changes of mushrooms during drying using the diffusion equation. A convective term is presented in the first model while, in the second model, the effective diffusion co-efficient is employed. Although the diffusion co-efficient is mainly dependent on the water content of the mushrooms, both models are suitable for analyzing the drying process. Moreover, in this study it has been demonstrated that both models are equivalent. The Genetic Algorithmic process was used to estimate the parameter values in different conditions. The information regarding the moisture content and the thickness evaluation taken from the models shows the best fit with the experimental data. The mathematical models developed to simulate the drying curve of mushroom have been evaluated and compared. 相似文献
83.
Kheng Soo Tay Noorsaadah Abd Rahman Mhd Radzi Bin Abas 《Environmental Chemistry Letters》2011,9(4):539-546
Contamination of wastewater by organic pollutants is a major worldwide issue. For instance plastic additives such as phthalates
are found in wastewater. Efficient techniques are thus needed to clean wastewaters. The Fenton reaction involving H2O2 and Fe(II) salts can be used to treat polluted water. During the Fenton reaction pollutants are decomposed directly by hydroxyl
radicals. In some cases toxic by-products are produced. Here dimethyl phthalate, diethyl phthalate, and dipropyl phthalate
by-products formed during the Fenton reaction were studied. Fenton degradation of selected phthalates yielded numerous transformation
products such as hydroxylated phthalates. The hydroxylation reaction occurred at the aromatic ring of phthalates and yielded
mono- and dihydroxylated phthalates. For monohydroxylated phthalate, 3-hydroxy- and 4-hydroxydialkylphthalates are the main
transformation products. In addition to hydroxylated derivatives, aliphatic chain degraded mono- and dihydroxylated phthalates
were also detected. 相似文献
84.
Ismail Md. Mofizur Rahman M. Monirul Islam M. Mosharraf Hossain M. Shahadat Hossain Zinnat A. Begum Didarul A. Chowdhury Milan K. Chakraborty M. Azizur Rahman M. Nazimuddin Hiroshi Hasegawa 《Environmental monitoring and assessment》2011,173(1-4):669-684
The concern over ensuing freshwater scarcity has forced the developing countries to delve for alternative water resources. In this study, we examined the potential of stagnant surface water bodies (SSWBs) as alternative freshwater resources in the densely populated Chittagong metropolitan area (CMPA) of Bangladesh??where there is an acute shortage of urban freshwater supply. Water samples were collected at 1-month intervals for a period of 1 year from 12 stations distributed over the whole metropolis. Samples were analyzed for pH, water temperature (WTemp), turbidity, electrical conductivity (EC), total dissolved solids, total solids, total hardness, dissolved oxygen (DO), chloride, orthophosphates, ammonia, total coliforms (TC), and trace metal (Cd, Cr, Cu, Pb, As, and Fe) concentrations. Based on these parameters, different types of water quality indices (WQIs) were deduced. WQIs showed most of CMPA-SSWBs as good or medium quality water bodies, while none were categorized as bad. Moreover, it was observed that the minimal water quality index (WQIm), computed using five parameters: WTemp, pH, DO, EC, and turbidity, gave a reliable estimate of water quality. The WQIm gave similar results in 72% of the cases compared with other WQIs that were based on larger set of parameters. Based on our finding, we suggest the wider use WQIm in developing countries for assessing health of SSWBs, as it will minimize the analytical cost to overcome the budget constraints involved in this kind of evaluations. It was observed that except turbidity and TC content, all other quality parameters fluctuated within the limit of the World Health Organization suggested standards for drinking water. From our findings, we concluded that if the turbidity and TC content of water from SSWBs in CMPA are taken care of, they will become good candidates as alternative water resources all round the year. 相似文献
85.
This article attempts to examine the influence of some selected predictor variables on female age at first marriage in slum areas of Bangladesh. A path and multiple classification analysis (MCA) approach have been adopted. Authors thought that respondent’s educational level and the mass media such as watching television have a significant direct impact on age at marriage, while the types of family and occupational status have an indirect effect on age at marriage. 相似文献
86.
Siddique Md Abu Bakar Islam Abu Reza Md Towfiqul Hossain Md Saddam Khan Rahat Akbor Md Ahedul Hasanuzzaman Md Sajid Md Wasiq Mamun Mia Md Younus Mallick Javed Rahman M. Safiur Rahman Md Mostafizur Bodrud-Doza Md 《Environmental science and pollution research international》2022,29(6):8577-8596
Environmental Science and Pollution Research - Currently, a well-developed combination of irrigation water quality index (IWQIs) and entropy water quality index (EWQIs) for surface water appraisal... 相似文献
87.
Aslam Muhammad Shoaib Huanxue Pan Sohail Sidra Majeed Muhammad Tariq Rahman Saeed ur Anees Shoaib Ahmad 《Environmental science and pollution research international》2022,29(7):10091-10100
Environmental Science and Pollution Research - Global warming and food security have led to increasing concern about agricultural crop production efficiency, especially wheat and rice farming. The... 相似文献
88.
Mazumder Mohammad Abu Jafar Chowdhury Imran Rahman Chowdhury Shakhawat Al-Ahmed Amir 《Environmental science and pollution research international》2022,29(36):54432-54447
Environmental Science and Pollution Research - A solid polymer, poly[(sodium methacrylate)-co-2-(methacryloyloxy)ethyl acetoacetate], p(MAA-co-MEAA) was synthesized and then grafted onto carbon... 相似文献
89.
This study attempted to determine the effects of heavy metals on the photosynthetic blue-green algae for their potential to use as a biosensor. The bioaccumulation of metals and its effects on pigments of Nostoc muscorum and Synechococcus PCC 7942 were assessed. The culture was grown in BG 11 liquid medium supplied with different metals like mercury (Hg), lead (Pb), and cadmium (Cd) and incubated (µM 20 concentrations) for 10 days under optimal conditions. The accumulated amounts of metals were determined by atomic absorption spectroscopy (AAS). The stress effects on photosynthetic pigment chlorophyll a (Chl a) were monitored by laser-induced fluorescence (LIF). Bio-concentration factor (BCF) reached a peak in cells on the 2nd day of incubation followed by a gradual reduction. The highest reduction in the pigment concentrations (Chl a and β carotene) was observed at 20?µM?L?1 Hg treatment. The results indicate that, cyanobacteria may serve as both potential species to be used as a biosensor and used to clean up heavy metals from contaminated water. These changes were analyzed with the long-term goal of exploiting cyanobacterial cells as biosensors. 相似文献
90.
Muhammad Nadeem Asghar Aneela Anwar Hafiz Muhammad Abdur Rahman Sammia Shahid Iram Nadeem 《毒物与环境化学》2013,95(8-10):659-676
AbstractThe objective of the present study is to synthesize various metal ions mixed TiO2 nanoparticles using a continuous hydrothermal synthesis pilot reactor for dye-sensitized solar cells (DSCs). In the pilot plant, aqueous solutions of the metal salts are mixed with a flow of supercritical water (450?°C and 24.1?MPa) in a confined jet mixer for continuous synthesis of metal ions-mixed nano-titania. Characterization of the particles was made using Brunauer–Emmett–Teller technique for specific surface area, powder X-ray diffraction analysis and transmission electron microscopy for identification and crystallite size, X-ray photoelectron spectroscopy for surface analysis and infrared spectroscopy for distinct group identification. Following the already existing procedures and using the titanates synthesized, dye-sensitized cells of 1?cm2 area were assembled and their photovoltaic parameters were evaluated under standard test conditions. The power conversion efficiencies (η %) for 40?mol % Zn2+, 5?mol % Zr4+ and 10?mol % Zn4+ titania were obtained to be 4.8, 4.95 and 4.9, respectively. The promising efficiency results from a greener and large-scale production of nano-titania is a step forward towards commercializing DSC technology. 相似文献