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( Dr. Neaz Ahmed ),( S. Ashfaq Hussain ) 아세아여성법학연구소 2009 아세아여성법학 Vol.12 No.-
The present article is focused on a comparative analysis of the procedures of marriage and divorce as practiced in Dangladesh and India. The main puropse is to briefly outline the general concepts and legal procepts and legal procedures followed in the two countries. Secondary sources have been used for analyzing legal procedures of marriage and divorce existing in both the countries. Emphasis is placed on the institution of marriage and divorce, dower provisions, and maintenance of a divorced woman along with the legal procedures on the subject. It is main-tained that a marriage is regarded as a dynamic socio-legal institution in both the countries. Marriage registration is mandatory for Bangladeshi Muslims, while it is not in India. There are also some differences found in the case of granting divorce in Bangladesh compared to India. Both the countries consider dower as an important aspect of marriage. However, the amount of dower may differ from one country to another. In respect of maintenance, it is found that the Indiam divorced women are in a better position compared to their counter-parts in Bangladesh. In sum, it is argued that, reforms are necessary, espe-cially in matters concerning divorce procedures. Moreover, it is stressed that strong grounds for such reforms is the need of the hour to reduce the increas-ing rate of divorce in these countries.
Aisha Abdullah,Ashfaq Ahmed,Parveen Akhter,Abdul Razzaq,Muhammad Zafar,Murid Hussain,Nasir Shahzad,Khaliq Majeed,Shahzad Khurrum,Muhammad Saifullah Abu Bakar,박영권 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.11
We evaluated the thermochemical properties and suitability of a variety of lignocellulosic biomass residues in Pakistan for energy production. Proximate, ultimate and calorific value analyses were performed to know the energy perspective, whereas thermogravimetric analysis was used to study the decomposition behavior of biomass samples under pyrolysis conditions. The moisture content, volatile matter, fixed carbon and ash content in the biomass samples were found within the range of 4.38-5.69%, 63.25-80.53%, 7.97-23.13%, and 7.12-14.35%, respectively. The range of carbon, hydrogen, and oxygen content was reported as 35.83-47.23%, 5.2-6.56%, and 45.6-58.55%, respectively. Lower values of sulfur and nitrogen content amongst the samples indicated that the biomass was environmentally friendly in terms of energy production. The heating value of the biomass was reported in the range of 15.20-18.44 MJ/kg. Fourier transform infrared spectroscopy showed the existence of hydroxyl, aldehydes, ketones, aromatic compounds, carbonyl compounds, ether, and halogen groups. Orange leaf biomass indicated a greater potential in producing bio-oil, whereas the horticulture biomass and mango leaves may have greater potential for biochar
An overview of the hydropower production potential in Bangladesh to meet the energy requirements
Monirul Islam Miskat,Ashfaq Ahmed,Md Salman Rahman,Hemal Chowdhury,Tamal Chowdhury,Piyal Chowdhury,Sadiq M. Sait,Young-Kwon Park 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Current environmental catastrophes generating from fossil fuel power generation has attracted the attention of energy planners to look for sustainable energy sources. Hydropower is one of the oldest energy sources that have been utilized all over the world to generate electricity, especially in remote areas. Being one of the most densely populated countries, the majority of power demand is fulfilled from fossil fuel. Despite having lots of rivers, Bangladesh has not explored its true potential. So, this paper presents a comprehensive review of the current hydropower potential in Bangladesh. Locations having hydropower potential is evaluated. Different technologies used for hydropower generation have been reviewed. Moreover, global hydropower potential has also been discussed in this study. Based on the economic and environmental study, it is found that small scale hydropower is most feasible in Bangladesh to provide sustainable energy. With a reasonable flow rate, 232 rivers of Bangladesh can be utilized small scale hydropower generation as well as ensuring energy security for remote people. The current study is believed to provide useful information in advancing the generation of hydropower based electricity in Bangladesh.
Mohd Azmuddin Abdullah,Ashfaq Ahmad,Syed Muhammad Usman Shah,Sanaa Mahmoud Metwally Shanab,Hamdy Elsayed Ahmed Ali,Mervat Aly Mohamed Abo-State,Mohd Fariduddin Othman 한국생물공학회 2016 Biotechnology and Bioprocess Engineering Vol.21 No.2
Increased demand for energy worldwide has resulted in increasing interest in alternative renewable sources of biofuels. Demand for improved systems of bioenergy generation, environmental remediation, and coproduction of high value bioactive compounds has led to the potential use of algae in biomass utilization. In Malaysia, palm oil industries generate high amount of solid wastes. Palm Oil Mill Effluent (POME) is estimated to be three times of the amount of crude palm oil produced. POME is a heavily polluting wastewater due to its high chemical oxygen demand (COD), high biochemical oxygen demand (BOD), and high contents of minerals such as nitrogen and phosphorus that can cause severe pollution to the environment and water resources. A combination of wastewater treatment and renewable bioenergy co-generation with recovery of high-value biochemicals would benefit the palm oil industry.
Optimization analysis of the absorption-stabilization process for fluid catalytic cracking unit
Hussain Muhammad Saddam,Ahmed Ashfaq,Yibin Liu,Amin Muhammad Nadeem,Zahoor Tahir,Saleem Muhammad Afnan,Roh Kosan,Hussain Murid,Abu Bakar Muhammad Saifullah,박영권 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
The absorption-stabilization process (ASP), an important part of petroleum refinery used in the end-use products of petroleum (such as stable gasoline, liquid petroleum gas, and dry gas), is energy-intensive and has low product quality. Aspen Plus process simulator was used for the development of the ASP process model. The developed process model was validated with the actual plant data. The validated model was used to optimize to minimize the cost of the ASP. This work shows that the optimization analysis of the ASP can further improve the product quality and reduce thermal energy consumption. In the new process, changing feeding parameters of supplementary absorption oil, stripping tower intermediate reboiler, and feeding position of stabilization tower reduced the C3 contents of dry gas considerably and lowered the C2 and lighter contents of LPG. Additionally, the new process saved 1.32 MW of thermal energy consumption compared with the existing process. The operating cost has been reduced from 10.921 million USD annually to 9.830 million USD per year. Furthermore, the cost-saving effect of this optimization is about 9.99% (1.091 million USD per year).
Monirul Islam Miskat,Ashfaq Ahmed,Md Salman Rahman,Hemal Chowdhury,Tamal Chowdhury,Piyal Chowdhury,Sadiq M. Sait,Young-Kwon Park 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Current environmental catastrophes generating from fossil fuel power generation has attracted the attention of energy planners to look for sustainable energy sources. Hydropower is one of the oldest energy sources that have been utilized all over the world to generate electricity, especially in remote areas. Being one of the most densely populated countries, the majority of power demand is fulfilled from fossil fuel. Despite having lots of rivers, Bangladesh has not explored its true potential. So, this paper presents a comprehensive review of the current hydropower potential in Bangladesh. Locations having hydropower potential is evaluated. Different technologies used for hydropower generation have been reviewed. Moreover, global hydropower potential has also been discussed in this study. Based on the economic and environmental study, it is found that small scale hydropower is most feasible in Bangladesh to provide sustainable energy. With a reasonable flow rate, 232 rivers of Bangladesh can be utilized small scale hydropower generation as well as ensuring energy security for remote people. The current study is believed to provide useful information in advancing the generation of hydropower based electricity in Bangladesh.
Usama Shakeel,Murid Hussain,Rizwan Sheikh,Ashfaq Ahmed,Muhammad Shahid Nazir,Wenshu Yang,Nasir Shezad,Parveen Akhter,박영권 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.5
This study aimed at the synthesis of heterogeneous acid catalysts by incorporating 12 tungstophosphoric acid (HPW) over mesoporous silica support KIT-6 via impregnation and sol-gel methods to improve the catalytic efficiency of the esterification reaction. The catalytic activity of the KIT-6 supported catalysts was investigated for esterification of oleic acid in the presence of MeOH. Synthesized catalysts were analyzed using scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and Fourier transform infrared (FTIR) spectroscopy techniques. Characterization results showed the variation in porosity, roughness, presence of SiO2 and kegging structure after successful deposition of HPW over KIT-6 surface. Additionally, the textural property of synthesized catalysts was compared with highly active HPW and sulfated KIT-6. The ordered structure of mesoporous silica KIT-6 facilitated the dispersion of HPW resulting in better catalytic stability and activity. To evaluate the impact of synthesizing technique on catalytic activity and effectiveness of heterogeneous acid catalysts, loading of HPW over KIT-6 mesoporous silica was controlled between 10 to 30 wt%. Catalysts synthesized by impregnation and sol-gel methods showed the highest catalytic activity with 30- IM and 25-SG, respectively. The enhanced performance was ascribed to the improved textural property and amount of HPW, which led to higher activity, stability and reusability
A comparative study of linear control strategies on the aerodynamics twin rotor system
Adnan Qayyum Shah,Muhammad Awais,Muhammad Zafar,Ashfaq Ahmed,Muhammad Mudassar,Muhammad Muneer,Memoona Saif,Abdul Razzaq,Seong Ho Jang,김선형,박영권 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.8
This work presents the comparative study among pole-placement (PP), optimalcontrol using output-feedback (OCOF), linear-quadratic regulator (LQR), and PID controllers for the twin rotor multi-input multi-output system (TRMS). The pitch and yaw are key attributes for stabilizing the TRMS MIMO system and control of flight. The main objective of this study is to use these classical controller techniques to monitor the pitch and yaw angles of TRMS and show the result of these techniques. Simulation results depicts the actual performance and reveals how PP outperforms the other techniques.
Muhammad Haris Hamayun,Murid Hussain,Iqrash Shafiq,Ashfaq Ahmed,Young-Kwon Park 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.1
Exergy analysis is an important tool to identify the improvements in various industrial processes. In this study, the existing steam power plant is examined based on energy and exergy analyses. The steam network in the power plant is comprised of two sections, one of them is used for paddy drying, while other portion is used to operate the turbine for in-house electricity production. Mass, energy, and exergy balances are applied to individual equipment of the plant. The power plant is modeled and simulated using Aspen HYSYS® V10. The calculated thermodynamic values are used for in-depth analysis of the power plant. Case-studies are included in this study to show the effect of various operational parameters on the process efficiency. The analysis shows that the boiler is the major source of exergy destruction, because of the incomplete combustion process, and inappropriate insulations. The remedial actions are also suggested in the study.
Aiman Fatima,Syed Sheraz Daood,Shafia Inaam,Zaeem Bin Babar,Ashfaq Ahmed,Muhammad Zafar,Tahir Maqsood Qaisrani,Abdul Razzaq,Muhammad Usman Rashid,Sunhyung Kim,Young-Kwon Park 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.3
Fluorite (fluorspar), an important industrial mineral ore, is one of the major raw materials for the production of hydrofluoric acid. Naturally occurring fluorite ore contains gangue minerals, primarily silica (SiO2) and calcite (CaCO3). The beneficiation of fluorspar is needed to mitigate the severity of operational issues. Several studies on fluorspar beneficiation using the froth floatation technique have been executed, but the process is restricted by the use of minerals acids to remove calcite. In this study, a novel scheme for fluorspar beneficiation was investigated for the floatation of fluorite and depression of calcite and other gangue minerals simultaneously without the use of mineral acids. Moreover, mixtures of saturated and unsaturated fatty acids (oleic acid and palmitic acid) were used instead of mineral acids. Various parameters were investigated, such as the weight percent of the feed-slurry, feed pH, the effect of reagents on the process selectivity, and the effect of feed boiling and dilution on the up-gradation of fluorspar. The adopted methodology with tested reagents resulted a 67 wt. % reduction of CO32− and 75 wt. % reduction of SiO2 in gangue material at a pH 10 for the feed slurry. Fluorspar purity increased from 65–75 wt. % to 95 wt. % after the boiling and dilution steps, respectively.