Search results for: S.M. Ashrafur Rahman

Items from 1 to 20 out of 23 results

article

Impact of early treatment programs on HIV epidemics: An immunity-based mathematical model

S.M. Ashrafur Rahman, Naveen K. Vaidya, Xingfu Zou

Mathematical Biosciences > 2016 > 280 > C > 38-49

While studies on pre-exposure prophylaxis (PrEP) and post-exposure prophylaxis (PEP) have demonstrated substantial advantages in controlling HIV transmission, the overall benefits of the programs with early initiation of antiretroviral therapy (ART) have not been fully understood and are still on debate. Here, we develop an immunity-based (CD4+ T cell count based) mathematical model to study the impacts...

article

Impact of fatty acid composition and physicochemical properties of Jatropha and Alexandrian laurel biodiesel blends: An analysis of performance and emission characteristics

Md. Amin Ruhul, Md. Joynul Abedin, S.M. Ashrafur Rahman, Bin Haji Hassan Masjuki, more

Journal of Cleaner Production > 2016 > 133 > C > 1181-1189

This experimental investigation deals with the effects of fatty acid methyl ester (FAME) composition and the physicochemical properties of biodiesel on engine performance and emissions. FAME compositions have a considerable influence on the physical and chemical properties of biodiesel, such as density, viscosity, heating value, cetane number (CN), oxidation stability, and cold flow properties. The...

article

Production of biodiesel from a non-edible source and study of its combustion, and emission characteristics: A comparative study with B5

M.J. Abedin, M.A. Kalam, H.H. Masjuki, M.F.M. Sabri, more

Renewable Energy > 2016 > 88 > Complete > 20-29

This investigation deals with the production of Alexandrian laurel (Calophyllum inophyllum) biodiesel (ALB) and study of the effects of its fatty acid methyl ester (FAME) compositions and physicochemical properties on the engine performance, combustion, and emissions. The experiment had been conducted in a four cylinder turbocharged diesel engine under varying speeds and full loading condition. 10%...

article

Effect of dynamic injection pressure on performance, emission and combustion characteristics of a compression ignition engine

S. Imtenan, S.M. Ashrafur Rahman, H.H. Masjuki, M. Varman, more

Renewable and Sustainable Energy Reviews > 2015 > 52 > C > 1205-1211

Diesel engine emissions produced during burning of fossil fuel are extremely accountable for numerous serious problems. In order to lessen these emissions, performance of diesel engine needs to be improved. Fuel injection pressure is one of the operating parameters that affects the performance and emissions of a diesel engine which has been reported in this review paper. Decrease in injection pressure...

article

Potential of biodiesel as a renewable energy source in Bangladesh

M. Habibullah, H.H. Masjuki, M.A. Kalam, S.M. Ashrafur Rahman, more

Renewable and Sustainable Energy Reviews > 2015 > 50 > C > 819-834

The transportation, agricultural, and power sector of Bangladesh is largely dependent on fossil fuels that decrease day by day. The government has to import large volumes of fuel from foreign sources to meet the fuel demand for power production, causing a negative impact on the country’s economy. Finding an alternative to fossil fuels is becoming the most urgent issue. Biodiesel can thus be a destined...

article

The effect of additives on properties, performance and emission of biodiesel fuelled compression ignition engine

H.K. Rashedul, H.H. Masjuki, M.A. Kalam, A.M. Ashraful, more

Energy Conversion and Management > 2014 > 88 > C > 348-364

With growing concern over greenhouse gases there is increasing emphasis on reducing CO₂ emissions. Despite engine efficiency improvements plus increased dieselization of the fleet, increasing vehicle numbers results in increasing CO₂ emissions. To reserve this trend the fuel source must be changed to renewable fuels which are CO₂ neutral. As a renewable, sustainable and alternative fuel for compression...

article

An experimental investigation of biodiesel production, characterization, engine performance, emission and noise of Brassica juncea methyl ester and its blends

Sanjid Ahmed, Masjuki Hj. Hassan, Md. Abul Kalam, S.M. Ashrafur Rahman, more

Journal of Cleaner Production > 2014 > 79 > Complete > 74-81

Diminishing fossil fuel reserves and environmental concerns have stimulated research into biofuels as potential renewable and sustainable replacements for fossil diesel. The present research aimed to investigate the feasibility of using mustard biodiesel blends for energy generation in order to reduce air and noise pollution. Mustard biodiesel (MB) was produced from waste mustard oil and the physicochemical...

article

Assessing idling effects on a compression ignition engine fueled with Jatropha and Palm biodiesel blends

S.M. Ashrafur Rahman, H.H. Masjuki, M.A. Kalam, M.J. Abedin, more

Renewable Energy > 2014 > 68 > Complete > 644-650

In this study, performance of a diesel engine operated with Jatropha and Palm biodiesel blends at high idling conditions has been evaluated. The result obtained from experiment elucidate that, at all idling modes HC and CO emissions of both blends decreases, however, NO _x emissions increases compared to pure diesel fuel. Jatropha biodiesel has higher viscosity compared to Palm biodiesel, which...

article

Performance, emissions, and heat losses of palm and jatropha biodiesel blends in a diesel engine

M.J. Abedin, H.H. Masjuki, M.A. Kalam, A. Sanjid, more

Industrial Crops & Products > 2014 > 59 > Complete > 96-104

After the successful implementation of B5, 5% palm (Elaeis guineensis) based biodiesel, in Malaysia on June 1, 2011, the Malaysian government is now looking to phase out B5 by replacing it with B10 or even a higher blending ratio. Being non-edible feedstock, jatropha (Jatropha curcas) can play a vital role along with the existing palm oil. This experiment was conducted in a four-cylinder diesel engine...

article

Impact of oxygenated additives to palm and jatropha biodiesel blends in the context of performance and emissions characteristics of a light-duty diesel engine

S. Imtenan, H.H. Masjuki, M. Varman, M.A. Kalam, more

Energy Conversion and Management > 2014 > 83 > Complete > 149-158

In recent years, palm and jatropha biodiesels have been considered as potential renewable energy sources in Malaysia. Therefore, this experimental investigation was conducted to improve the blend of these two biodiesels (20% biodiesel blend, named P20 and J20, respectively) with the help of oxygenated additives. The comparative improvement of P20 and J20 blends with ethanol, n-butanol, or diethyl...

article

Assessment of emission and performance of compression ignition engine with varying injection timing

S.M. Ashrafur Rahman, H.H. Masjuki, M.A. Kalam, A. Sanjid, more

Renewable and Sustainable Energy Reviews > 2014 > 35 > Complete > 221-230

Engine performance improvement and exhaust emissions reduction are the two most important issues to develop a more efficient engine with less environmental impact. For a diesel engine, injection timing is one of the major parameters that affect the engine performance and emissions. Now-a-days, alternative fuels for internal combustion engines have created interest among the researchers around the...

article

Impact of Tenofovir gel as a PrEP on HIV infection: A mathematical model

S.M. Ashrafur Rahman, Naveen K. Vaidya, Xingfu Zou

Journal of Theoretical Biology > 2014 > 347 > Complete > 151-159

Pre-exposure prophylaxis (PrEP) has been considered as one of the promising interventions for HIV infection as experiments on various groups and sites have reported its significant effectiveness. This study evaluates the effectiveness of Tenofovir gel, one of the widely used PrEPs for women, through a mathematical model. Our model has excellent agreement with the experimental data on the use of Tenofovir...

article

Effect of idling on fuel consumption and emissions of a diesel engine fueled by Jatropha biodiesel blends

S.M. Ashrafur Rahman, H.H. Masjuki, M.A. Kalam, M.J. Abedin, more

Journal of Cleaner Production > 2014 > 69 > Complete > 208-215

An engine running at low load and low rated speed is said to be subject to high idling conditions, a mode which represents one of the major problems currently the transport industry is facing. During this time, the engine can not work at peak operating temperature. This leads to incomplete combustion and emissions level increase due to having fuel residues in the exhaust. Also, idling results in increase...

article

Production of palm and jatropha based biodiesel and investigation of palm-jatropha combined blend properties, performance, exhaust emission and noise in an unmodified diesel engine

A. Sanjid, H.H. Masjuki, M.A. Kalam, S.M. Ashrafur Rahman, more

Journal of Cleaner Production > 2014 > 65 > Complete > 295-303

An ever increasing drift of energy consumption, unequal geographical distribution of natural wealth and the quest for low carbon fuel for a cleaner environment are sparking off the production and use of biodiesels in many countries around the globe. In this work, palm biodiesel and jatropha biodiesel were produced from the respective crude vegetable oils through transesterification, and the different...

article

Performance and emission analysis of Jatropha curcas and Moringa oleifera methyl ester fuel blends in a multi-cylinder diesel engine

Md. Mofijur Rahman, Masjuki Hj. Hassan, Md. Abul Kalam, Abdelaziz Emad Atabani, more

Journal of Cleaner Production > 2014 > 65 > Complete > 304-310

Research on alternative fuels is increasing due to environmental concerns and diminishing fossil fuel reserves. Biodiesel is one of the best renewable replacements for petroleum-based fuels. This paper examines the potential of biodiesel obtained from Jatropha curcas and Moringa oleifera oils. The physico-chemical properties of J. curcas and M. oleifera methyl esters were presented, and their 10%...

article

Engine combustion, performance and emission characteristics of gas to liquid (GTL) fuels and its blends with diesel and bio-diesel

H. Sajjad, H.H. Masjuki, M. Varman, M.A. Kalam, more

Renewable and Sustainable Energy Reviews > 2014 > 30 > Complete > 961-986

Crude oil price hikes, energy security concerns and environmental drivers have turned the focus to alternative fuels. Gas to liquid (GTL) diesel is regarded as a promising alternative diesel fuel, considering the adeptness to use directly as a diesel fuel or in blends with petroleum-derived diesel or bio-diesel. GTL fuel derived from Fischer–Tropsch synthesis is of distinctly different characteristics...

article

Experimental Investigation of Palm-jatropha Combined Blend Properties, Performance, Exhaust Emission and Noise in an Unmodified Diesel Engine

A. Sanjid, H.H. Masjuki, M.A. Kalam, S.M. Ashrafur Rahman, more

Procedia Engineering > 2014 > 90 > Complete > 397-402

Ever increasing drift of energy consumption, unequal geographical distribution of natural wealth and the quest of low carbon fuel for cleaner environment are sparking off the production and use of biodiesels in many countries around the globe. In this work, different physicochemical property of palm and jatropha combined biodiesels have been presented which is acceptable according to ASTM standard...

article

Effect of DLC Coating on Tribological Behavior of Cylinder Liner-piston Ring Material Combination When Lubricated with Jatropha Oil

H.M. Mobarak, H.H. Masjuki, E. Niza Mohamad, S.M. Ashrafur Rahman, more

Procedia Engineering > 2014 > 90 > Complete > 733-739

The expansion of modern engines would have been unfeasible without advanced lubricant chemistry and proper lubricant formulation. Introduction of diamond like carbon (DLC) coatings opens further possibilities in improving performance of engine and transmission components, which cannot longer be achieved only by lubricant design.DLC coatings show extremely good promise for a number of applications...

article

Production of palm and Calophyllum inophyllum based biodiesel and investigation of blend performance and exhaust emission in an unmodified diesel engine at high idling conditions

S.M. Ashrafur Rahman, H.H. Masjuki, M.A. Kalam, M.J. Abedin, more

Energy Conversion and Management > 2013 > 76 > Complete > 362-367

Rapid depletion of fossil fuels, increasing fossil-fuel price, carbon price, and the quest of low carbon fuel for cleaner environment – these are the reason researchers are looking for alternatives of fossil fuels. Renewable, non-flammable, biodegradable, and non-toxic are some reasons that are making biodiesel as a suitable candidate to replace fossil-fuel in near future. In recent years, in many...

article

Impact of palm, mustard, waste cooking oil and Calophyllum inophyllum biofuels on performance and emission of CI engine

A. Sanjid, H.H. Masjuki, M.A. Kalam, S.M. Ashrafur Rahman, more

Renewable and Sustainable Energy Reviews > 2013 > 27 > Complete > 664-682

Present energy situation of the world is unsustainable due to unequal geographical distribution of natural wealth as well as environmental, geopolitical and economical concerns. Ever increasing drift of energy consumption due to growth of population, transportation and luxurious lifestyle has motivated researchers to carry out research on biofuels as a sustainable alternative fuel for diesel engine...

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Keywords

BIODIESEL (9)
EMISSION (7)
ENGINE PERFORMANCE (6)
DIESEL ENGINE (5)
PERFORMANCE (5)
FUEL CONSUMPTION (4)
CHARACTERIZATION (3)
EMISSION ANALYSIS (3)
EMISSIONS (3)
EXHAUST EMISSION (3)
IDLING (3)
NOISE (3)
BIODIESEL PRODUCTION (2)
COMBUSTION (2)
ETHANOL (2)
HEAT LOSS (2)
HIV (2)
INJECTION TIMING (2)
JATROPHA CURCAS (2)
PALM-JATROPHA COMBINED BLEND (2)
TRANSESTERIFICATION (2)
ADDITIVES (1)
AIR PROCESS HEATER (1)
ALTERNATIVE FUELS (1)
ANTIRETROVIRAL THERAPY (1)
BAFFLE (1)
BASIC REPRODUCTION NUMBER (1)
BIO-DIESEL (1)
BIO-LUBRICANT (1)
BIODIESEL–DIESEL BLENDS (1)
BIOFUEL (1)
BLENDING (1)
CALOPHYLLUM (1)
CALOPHYLLUM INOPHYLLUM OIL (1)
CARTRIDGE HEATER (1)
CD4+ T CELL COUNT (1)
COMMUNITY-LEVEL IMMUNITY (1)
DIESEL (1)
DIETHYL ETHER (1)
ENERGY BALANCE (1)
FATTY ACID COMPOSITION (1)
FATTY ACID METHYL ESTER (1)
FRICTION (1)
FUEL PROPERTIES (1)
GAS TO LIQUIDS (GTL) (1)
HEAT TRANSFER CORRELATIONS (1)
HEAT TRANSFER ENHANCEMENT (1)
HUMAN HEALTH (1)
HYDROGENATED AMORPHOUS CARBON (A-C: H)DLC COATING (1)
IDLE (1)
IDLE-REDUCTION TECHNOLOGIES (1)
INJECTION PRESSURE (1)
MATHEMATICAL MODEL (1)
MORINGA OLEIFERA (1)
MUSTARD BIODIESEL (1)
MUSTARD OIL (1)
N-BUTANOL (1)
PALM (1)
PALM OIL (1)
PERFORMANCE AND EMISSION (1)
PREP (1)
PRODUCTION (1)
PROPERTIES (1)
RENEWABLE (1)
RENEWABLE ENERGY (1)
TENOFOVIR GEL (1)
THERMAL BALANCE (1)
TRANSMISSION RATE (1)
WASTE COOKING OIL (1)
WEAR (1)
more

Journal

Renewable and Sustainable Energy Reviews (6)
Journal of Cleaner Production (5)
Energy Conversion and Management (4)
Procedia Engineering (3)
Renewable Energy (2)
Industrial Crops & Products (1)
Journal of Theoretical Biology (1)
Mathematical Biosciences (1)

INFONA - science communication portal

Search results for: S.M. Ashrafur Rahman

Impact of early treatment programs on HIV epidemics: An immunity-based mathematical model

Impact of fatty acid composition and physicochemical properties of Jatropha and Alexandrian laurel biodiesel blends: An analysis of performance and emission characteristics

Production of biodiesel from a non-edible source and study of its combustion, and emission characteristics: A comparative study with B5

Effect of dynamic injection pressure on performance, emission and combustion characteristics of a compression ignition engine

Potential of biodiesel as a renewable energy source in Bangladesh

The effect of additives on properties, performance and emission of biodiesel fuelled compression ignition engine

An experimental investigation of biodiesel production, characterization, engine performance, emission and noise of Brassica juncea methyl ester and its blends

Assessing idling effects on a compression ignition engine fueled with Jatropha and Palm biodiesel blends

Performance, emissions, and heat losses of palm and jatropha biodiesel blends in a diesel engine

Impact of oxygenated additives to palm and jatropha biodiesel blends in the context of performance and emissions characteristics of a light-duty diesel engine

Assessment of emission and performance of compression ignition engine with varying injection timing

Impact of Tenofovir gel as a PrEP on HIV infection: A mathematical model

Effect of idling on fuel consumption and emissions of a diesel engine fueled by Jatropha biodiesel blends

Production of palm and jatropha based biodiesel and investigation of palm-jatropha combined blend properties, performance, exhaust emission and noise in an unmodified diesel engine

Performance and emission analysis of Jatropha curcas and Moringa oleifera methyl ester fuel blends in a multi-cylinder diesel engine

Engine combustion, performance and emission characteristics of gas to liquid (GTL) fuels and its blends with diesel and bio-diesel

Experimental Investigation of Palm-jatropha Combined Blend Properties, Performance, Exhaust Emission and Noise in an Unmodified Diesel Engine

Effect of DLC Coating on Tribological Behavior of Cylinder Liner-piston Ring Material Combination When Lubricated with Jatropha Oil

Production of palm and Calophyllum inophyllum based biodiesel and investigation of blend performance and exhaust emission in an unmodified diesel engine at high idling conditions

Impact of palm, mustard, waste cooking oil and Calophyllum inophyllum biofuels on performance and emission of CI engine

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