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Search Results: 1 - 10 of 338484 matches for " Rashid S. Mohammad "
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Phase Behavior of a United Arab Emirates Stock-Tank Oil and Carbon Dioxide at Reservoir Conditions: Experiments and Thermodynamic Modeling  [PDF]
Samir I. Abu-Eishah, Rashid S. Mohammad
Open Journal of Yangtze Oil and Gas (OJOGas) , 2016, DOI: 10.4236/ojogas.2016.11001
Abstract: Injection of a soluble gas like CO2 into an oil reservoir reduces the interfacial tension and oil viscosity and contributes to oil swelling, which together, in turn, enhance the oil mobility and relative permeability. In this work an experimental phase equilibrium setup for the recombination of live oil (stock-tank oil and first-stage separator gas) and measurement of the corresponding phase behaviors of CO2/live oil mixtures is described. In the recombination process, the vapor-to-oil molar ratio was adjusted until the composition of the original reservoir fluid was obtained. The average of the absolute error (AAE) in composition was about 0.77% and 1.09% for the two reservoir fluids under test (named here wells A#22 and A#33, respectively). The optimum vapor-to-oil molar ratio for zero deviation in the methane composition in the live oil (recombined) was about 0.42 for both wells. In addition, the PVTi simulator was used to reproduce the live oil (by combining the first-stage separator gas and the stock-tank oil) and also to predict the recombined oil characteristics at the reservoirs’ saturation pressure and bottom hole temperature. On the other hand, the PVTpro simulator was used to investigate the oil swelling rate and establish the relationship between saturation pressure and the injected CO2 mass fraction. The average of the absolute relative error (AARE) between experimental and predicted saturation pressures was 7.78% for well A#22 and 5.38% for well A#33.
Chemical and biological investigations of Dillenia indica Linn.
Most. Nazma Parvin, Mohammad S. Rahman, Mohammad S. Islam and Mohammad A. Rashid
Bangladesh Journal of Pharmacology , 2009,
Abstract: A total of four compounds namely, lupeol (1), betulinaldehyde (2), betulinic acid (3) and stigmasterol (4) were isolated from the stem extract of Dillenia indica Linn. The structures of the isolated compounds (1-4) were established by extensive spectroscopic studies. The crude methanolic extracts and its n-hexane, carbon tetrachloride, dichloromethane and chloroform soluble partitionates demonstrated weak antimicrobial activity against a wide range of Gram-positive and Gram-negative bacteria and fungi. The extractives revealed significant cytotoxic activity when tested by brine shrimp lethality bioassay. In addition, the extractives exhibited significant free radical scavenging activity when compared with ascorbic acid.
Phytochemical and biological investigations of Albizzia lebbeck Benth
Mohammad M. Hussain,Mohammad S. Rahman,Abdul Jabbar,Mohammad A. Rashid
Boletín Latinoamericano y del Caribe de Plantas Medicinales y Aromáticas , 2008,
Abstract: Desde la fracción soluble en hexano obtenida a partir de un extracto metanólico de las raíces de Albizzia lebbeck Benth. se aislaron lupeol (1), estigmasterol (2), ácido 4-hidroxi-3-metoxicinámico (3) y ácido trans-p-cumárico (4). Las estructuras de los compuestos aislados se establecieron por estudios espectroscópicos, incluyendo estudios de RNM de alta resolución. Las diferentes fracciones del extracto metanólico mostraron actividad antimicrobiana desde leve hasta moderada y diversos niveles de actividad toxicidad. Este es el primer informe sobre el aislamiento de los compuestos 1-4 de esta especie.
Quasinilpotent Part of w-Hyponormal Operators  [PDF]
Mohammad Rashid
Open Access Library Journal (OALib Journal) , 2014, DOI: 10.4236/oalib.1100548
Abstract: For a w-hyponormal operator T acting on a separable complex Hilbert space H, we prove that: 1) the quasi-nilpotent part Ho(- λ) is equal to Ker(T- λI); 2) has Bishop’s propertyβ; 3) if σw (T)={0}, then it is a compact normal operator; 4) If T is an algebraically w-hyponormal operator, then it is polaroid and reguloid. Among other things, we prove that ifTn and Tn* are w-hyponormal, then T is normal.
Environmentally Harmful Low Density Waste Plastic Conversion into Kerosene Grade Fuel  [PDF]
Moinuddin Sarker, Mohammad Mamunor Rashid, Muhammad Sadikur Rahman, Mohammad Molla
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.38083
Abstract: Plastics wastes from a municipal solid waste (MSW) plant have a high-energy content and are suitable for fuel generation. Thermal cracking is one of the possible ways to obtain petrochemical feedstock from polymer wastes. Municipal waste plastic of LDPE conversion to kerosene grade fuel experiments were carried out under atmospheric conditions at temperatures between 150℃ and 420℃. Low density polyethylene (LDPE) plastic waste (Code #2) was thermally depolymerized in batch process into stainless steel reactor without adding catalyst. The maximum kerosene grade fuel yield is 30%, other grade fuel 60%, light gas 6% and left over residue 4%. The composition, sulphur and Btu value of liquid products were determined by ASTM method. Produced fuel was analyzed by Gas Chromatography and Mass Spectrometer and FT-IR. Very high conversions from LDPE waste plastic to kerosene grade fuel (up to 35%) were obtained while using this technique. Detailed product analyses and characterization lead to a reasonable explanation of reaction pathways and mechanisms.
On generalized vector quasivariational-like inequality problems
Abdul Khaliq,Mohammad Rashid
Fixed Point Theory and Applications , 2005, DOI: 10.1155/fpta.2005.243
Abstract: We introduce a class of generalized vector quasivariational-like inequality problems in Banach spaces. We derive some new existence results by using KKM-Fan theorem and an equivalent fixed point theorem. As an application of our results, we have obtained as special cases the existence results for vector quasi-equilibrium problems, generalized vector quasivariational inequality and vector quasi-optimization problems. The results of this paper generalize and unify the corresponding results of several authors and can be considered as a significant extension of the previously known results.
On generalized vector quasivariational-like inequality problems
Khaliq Abdul,Rashid Mohammad
Fixed Point Theory and Applications , 2005,
Abstract: We introduce a class of generalized vector quasivariational-like inequality problems in Banach spaces. We derive some new existence results by using KKM-Fan theorem and an equivalent fixed point theorem. As an application of our results, we have obtained as special cases the existence results for vector quasi-equilibrium problems, generalized vector quasivariational inequality and vector quasi-optimization problems. The results of this paper generalize and unify the corresponding results of several authors and can be considered as a significant extension of the previously known results.
A New Kind of Renewable Energy: Production of Aromatic Hydrocarbons Naphtha Chemical by Thermal Degradation of Polystyrene (PS) Waste Plastic  [PDF]
Moinuddin Sarker, Mohammad Mamunor Rashid, Muhammad Sadikur Rahman, Mohammed Molla
American Journal of Climate Change (AJCC) , 2012, DOI: 10.4236/ajcc.2012.13012
Abstract: Polystyrene (PS) waste plastic to renewable energy or naphtha grade fuel production through fractional distillation process was applied and PS liquefaction temperature range was 250?C - 430?C and fractional column temperature was 110?C - 135?C for naphtha grade fuel separation. The thermal degradation of PS waste plastic to renewable energy or naphtha grade chemical production was without adding any kind of cracking catalyst and without vacuum system. Polystyrene waste plastic is not bio-degradable and its can remain long period of landfill and creating gas emission for that reason its major cause climate change. For experimental purpose raw sample was use 1 kg of PS waste plastic and experiment was performed under Labconco fume hood and experiment was fully closed system, whole experiment was performed into stainless steel reactor. Produced fuel was analysis by gas chromatography and mass spectrometer, FT-IR and DSC. Analysis result indicate for fuel compounds chemical structure, compound band energy and enthalpy, delta H value. Produced fuel sulfur content less then environmental protection agency (EPA) level and fuel could be use for chemical feedstock refinery for further modification. By using this technology can reduce some foreign oil dependency and boost up renewable energy sector all over the world.
Explicit bounds on retarded Gronwall-Bellman inequality
Mohammad M.H Rashid
Tamkang Journal of Mathematics , 2012, DOI: 10.5556/j.tkjm.43.2012.99-108
Abstract: In this paper explicit bounds on retarded Gronwall-Bellman and Bihari-like integral inequalities are established.
HIGH ENERGY CONTENT LIQUID HYDROCARBON FUEL FROM MIXTURE OF POLYPROPYLENE AND POLYSTYRENE WASTE PLASTICS USING THERMAL CRACKING AND ACTIVATED CARBON
Moinuddin Sarker* and Mohammad Mamunor Rashid
International Journal of Bioassays , 2013,
Abstract: In this current society, petroleum is a big factor to meet the world’s energy demand. According to statistics, the consumption of petroleum is much higher than its production rate. Furthermore, countries around the world spend large amounts of money each year to import fossil fuel, which can cause major deflation in a countries economy. Many alternative proposals have been made to overcome the petroleum issue. Alternate energy sources have been developed based on reliable sources to reduce the demand of petroleum, but these sources require vast amount of land and financial complication. Research based on conversion of waste plastic into high energy content liquid fuel has the potential to overcome the world’s energy demand. Unlike fossil fuel, the source of waste plastic is virtually unlimited. Nearly 48 million tons of waste plastic is generated in the US alone. From this amount 65% is landfill, 25% is incineration and 10% is for recycling purpose. Waste plastic is not biodegradable it can remain for a long period in land fill. Incineration and recycle process crating toxic gas and affecting greenhouse gas. The presence of these waste plastic on landfill causes variety of environmental and health problems. Natural State Research Inc has developed unique technology that will remove these waste plastics from landfill and convert them into high energy content liquid hydrocarbon fuel. Preliminary test have shown that waste plastic converted into fuel burns cleaner than the current commercial fuels and it can be produced a lower cost due to its primary source being waste plastic. The present technology has already shown the capability to produce this fuel from waste plastics in a laboratory scale and plans to move on into pilot and commercialization plant.
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