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Search Results: 1 - 10 of 5955 matches for " Md. Jobaer Alam "
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The Prospects of Blue Economy to Promote Bangladesh into a Middle-Income Country  [PDF]
Md. Monjur Hasan, B. M. Sajjad Hossain, Md. Jobaer Alam, K. M. Azam Chowdhury, Ahmad Al Karim, Nuruddin Md. Khaled Chowdhury
Open Journal of Marine Science (OJMS) , 2018, DOI: 10.4236/ojms.2018.83019
Abstract: This paper draws attention to the prospects of sea-based economy to promote Bangladesh in a middle-income country through the sustainable use of marine resources. About three-fourths of the earth is covered by the seas. It plays the vital role in two important functions from ancient time known as the means of communication and the source of huge living and non-living natural resources. At present, the countries are becoming very much concerned about their marine resources to resolve many of the present and future challenges of their economies. Generally for Bangladesh, ocean is contributing a significant role to its overall socio-economic progress through rising up the economic activities across the country and especially to the coastal zone at southern part. This paper investigates how much Bangladesh is capable to take of or handle the challenges to become a middle income country through the Sustainable Development Goals (SDGs). In addition, it has attempted with a closer-look to find out the barriers or limitations of these activities from different angles if exist.
A Numerical Study of MHD Laminar Flow in a Rotating Curved Pipe with Circular Cross Section  [PDF]
Md. Mainul Hoque, Md. Mahmud Alam
Open Journal of Fluid Dynamics (OJFD) , 2015, DOI: 10.4236/ojfd.2015.52014
Abstract: The incompressible viscous steady flow through a rotating curved pipe of circular cross-section with magnetic field is investigated numerically to examine the combined effects of rotation (Coriolis force), magnetic field and curvature (centrifugal force) on the flow. The curvature of the pipe has been assumed to be small, that is, the radius of the circle in which the central line of the pipe is coiled is large in comparison with the radius of the cross section. Spectral method is applied as a main tool for the numerical technique, where Fourier series, Chebyshev polynomials, Collocation methods, and Iteration method are used as secondary tools. The flow depends on the Taylor number (Tr), Dean Number (Dn), Magnetic Parameter (M) and the dimensionless curvature of the pipe δ. When Tr > 0, the rotation is in the direction so that the Coriolis force enforces the curvature effect. When Tr < 0, the rotation is in the direction so that the Coriolis force exhibits an opposite effect to that of the curvature. The calculations are carried out for 1500 ≤ Tr ≤ 1500, Dn ≥ 1000 (large Dean number), M ≥ 0 and δ = 0.01. Due to high magnetic field four-vortex solution is observed in a rotating curved pipe system. Visualization is attained with MAPLE software.
Effect of Packing Materials and Other Parameters on the Air Stripping Process for the Removal of Ammonia from the Wastewater of Natural Gas Fertilizer Factory  [PDF]
Raquibul ALAM, Md. Delwar HOSSAIN
Journal of Water Resource and Protection (JWARP) , 2009, DOI: 10.4236/jwarp.2009.13026
Abstract: Air-stripping method was used to remove ammonia from the wastewater collected from natural gas fertilizer factory. Different materials were used as packing materials for the air stripping system. The effect of pH over 10.5, air-water flow ratio, nature of packing materials, height of materials and initial influent concentration of ammonia on air stripping unit were investigated. An attempt has been made to find out the stripping con-stant. Stripping constant was found to be .001, 0014, .001 and .0009 for coal, plastic ring, stone chips and wood chips, respectively. Best result was found for plastic ring for its higher surface area. Wood chips did not give good result, because the chips amalgamate with each other and hence reduces the surface area.
Magnetohydrodynamic Boundary Layer Flow of Non-Newtonian Fluid and Combined Heat and Mass Transfer about an Inclined Stretching Sheet  [PDF]
Md. Shah Alam, Md. Rashedul Islam, Mohammad Ali, Md. Abdul Alim, Md. Mahmud Alam
Open Journal of Applied Sciences (OJAppS) , 2015, DOI: 10.4236/ojapps.2015.56029
Abstract: The steady magneto hydrodynamic (MHD) boundary layer flow and combined heat and mass transfer of a non-Newtonian fluid over an inclined stretching sheet have been investigated in the present analysis. The effects of the flow parameters on the velocity, temperature, species concentration, local skin friction, local Nusselt number, and Sherwood number are computed, discussed and have been graphically represented in figures and tables for various values of different parameters. The numerical results are carried out for several values of the combined effects of magnetic parameter M, stretching parameter λ, Prandtl number Pr, Eckert number Ec, Schmidt number Sc, Soret number S0, slip parameter A and Casson parameter n on velocity, temperature and concentration profiles and also the skin-friction coefficient ?f?\"(0)?local Nusselt number -θ'(0)?and local Sherwood number -ψ'(0)?are discussed and presented in tabular form. The results pertaining to the present study indicate that the velocity profiles decrease as the increase of magnetic field parameter, but reverse trend arises for the effect of Casson parameter and stretching ratio parameter for both Newtonian and non-Newtonian fluids. The temperature profiles increase forthe effect of magnetic parameter, Prandtl number and Eckert number in case of Newtonian and non-Newtonian fluids. The concentration profile increases for the effect of Soret number while concentration profile decreases for the increasing values of Schmidt number, magnetic parameter, Prandtl number and Eckert number for both Newtonian and non-Newtonian fluids. By considering the cooling plate the numerical results for the skin-friction coefficient f?\"(0) , local Nusselt number?-θ'(0) and local Sherwood number ?-ψ'(0) are presented in Tables 1-3.
Quality Study of Rice Husk Ash (RHA) Brick Using Neutron Radiography Technique  [PDF]
Md. Khurshed Alam, Md. Moniruz Zaman, Md. Al Amin
Journal of Building Construction and Planning Research (JBCPR) , 2015, DOI: 10.4236/jbcpr.2015.33013
Abstract: A powerful non-destructive testing (NDT) technique is adopted to study the quality of RHA brick-1 and RHA brick-2. In that case, rice husk ash has been utilized for the preparation of bricks in full replacement of clay. In these studies, homogeneity of elemental distribution, water absorption and size and shape of the pores have been observed. From the studies, it was observed that elemental distribution is very good at various level, large number of porosity is presented with little bit size, initial rate of absorption (IRA) due to first five minutes immersion of water is higher compared to other immersion time (>5 minute), incremental water intrusion area increases very slowly with the increasing immersion time and the water absorption for RHA brick-2 becomes saturated very early than that of the RHA brick-1.
Understanding the Trends of Maternal and Neonatal Mortality in Bangladesh in the Context of South Asia  [PDF]
Halima Akhter, Md. Mahbubur Rahman Alam
Advances in Anthropology (AA) , 2019, DOI: 10.4236/aa.2019.91004
Abstract: Introduction: This article is presenting the overall situation of maternal and neonatal health in Bangladesh in comparison to other South Asian countries. Bringing down the maternal mortality ratio from 569 to 143 was the target for Bangladesh which was achieved up to 176 per 100,000 live births by 2015 but the target as per the Millennium Development Goal 5 was not fulfilled yet and remained as a challenge. Besides, the improvement in reducing the neonatal mortality rate during 1993-2014 shows a national level decline from 52 to 28 per 1000 live births, which is almost half during this period with a percentage change of about 46% and so more care is needed here also. Objectives and Methods: The manuscript has three objectives: to present the trends of maternal and neonatal mortality, to explain the maternal and neonatal mortality rate by background characteristics and the causes of maternal and neonatal deaths in Bangladesh on the basis of South Asian perspective. The main source of data collection and analysis was the secondary sources, from different journals and project reports published between the years 2001 to May 2018. Main Text: In Bangladesh, 35% maternal deaths occurred as indirect causes and 9% causes of deaths are still remaining unidentified. In addition, hemorrhage (31%) and pre-eclampsia-eclampsia (20%) are found two vital causes of maternal deaths with two more causes which are due to obstructed labor (7%), and termination of pregnancy (1%). It is found that Bangladesh has shown a great improvement in maternal mortality ratio by reducing maternal mortality to 176 in 2015 from 569 deaths per 100,000 live births in 1990, with an increase of 69% as progress. On the other hand, it is found that 43% of neonatal deaths in Bangladesh occurred due to birth asphyxia, 24% due to neonatal pneumonia, 22% due to prematurity, 5% due to sepsis, 0.2% due to meningitis and encephalitis, 0.1% due to congenital malformation and 5% causes are still remain undetermined. While comparing the situation to other South Asian countries, it is seen that the causes of neonatal deaths by prematurity are in the highest position that causes 29.7%, 43.8%, 30.8% and 39.3% deaths and birth asphyxia is in the second highest position that causes 22.9%, 18.9%, 23.4% and 20.9% deaths in Bangladesh, India, Nepal and Pakistan respectively. Conclusion: This paper will support health researchers and medical anthropologist for further studies and specifically for
Asymptotic Solutions for the Fifth Order Critically Damped Nonlinear Systems in the Case for Small Equal Eigenvalues  [PDF]
Md. Firoj Alam, M. Abul Kawser, Md. Mahafujur Rahaman
American Journal of Computational Mathematics (AJCM) , 2015, DOI: 10.4236/ajcm.2015.54036
Abstract:

This article examines a fifth order critically damped nonlinearsystem in the case of small equal eigenvalues and tries to find out an asymptotic solution. This paper suggests that the solutions obtained by the perturbation techniques based on modified Krylov-Bogoliubov-Mitropoloskii (KBM) method is consistent with the numerical solutions obtained by the fourth order Runge-Kutta method.

Knowledge Level about HIV/AIDS among the Villagers of Comilla District, Bangladesh  [PDF]
Md. Shafiur Rahman, Md. Nuruzzaman Khan, Md. Nazrul Islam Mondal, Md. Shamsher Alam, Kazi Mohiuddin Ahmed, Md. Rafiqul Islam
World Journal of AIDS (WJA) , 2014, DOI: 10.4236/wja.2014.44052
Abstract: The HIV/AIDS epidemic has grown on an unprecedented scale since it was first recognized, and presently it is considered as a well known global public health crisis. In making the health policy where millions of populations are at risk, it is necessary to understand the knowledge level about HIV/AIDS. So, this study aimed at to investigate the knowledge level about HIV/AIDS among the villagers. Data and necessary information were collected from one hundred villagers of Salmanpur from Comilla district, Bangladesh through a structured questionnaire. The collected data were used for univariate analysis, to carry out the description of the variables; and to justify the total score of knowledge about HIV/AIDS among the respondents, Cronbach’s alpha (α) was calculated. The results revealed that almost all the respondents (92.00%) were ever heard about HIV/AIDS and half of them (51.00%) were known it as a communicable disease. Majority of the respondents (62.00%) believed that it is caused by heterosexual relation as well as sex with HIV positive persons. However, a good number of respondents were found unaware about the major causes and preventive ways of AIDS. Less than half of the respondents (45.00%) had medium knowledge (α = 0.34 - 0.66) and only 36.00% had the enough knowledge about HIV/AIDS. The knowledge level is increasing with the increase of education level, and the respondents who involved in agricultural works are found the lowest knowledge level (47.00%) about HIV/AIDS. The villagers were known about HIV/AIDS but they do not have accurate information about the ways in which AIDS virus can or cannot be transmitted. Therefore, effective programs should be taken to increase the knowledge level about HIV/AIDS among the villagers in Bangladesh.
Modelling Volatility of the BDT/USD Exchange Rate with GARCH Model
Md. Zahangir Alam
International Journal of Economics and Finance , 2012, DOI: 10.5539/ijef.v4n11p193
Abstract: The key objective of the study is to explore the application of GARCH type models, like GARCH; EGARCH; TARCH; and PARCH; when applied to task for modelling the BDT/USD exchange rate using the daily foreign exchange rate series fixed up by Bangladesh Bank. This study is conducted by benchmarking their results with AR and ARMA models.The BDT/USD time series from July 03, 2006 to April 30, 2012 are used for the study purpose out of which in-sample and out-of-sample date set cover from July 03, 2006 to May 13, 2010 and May 14, 2010 to April 30, 2012 respectively.The major finding of this study is that all GARCH type models demonstrate that past volatility of exchange rate significantly influence current volatility. Both the AR and ARMA models are found as the best model as per in-sample statistical performance results, whereas according to out-of-sample, GARCH model is the best model with transaction costs. Moreover, Both the ARMA and AR models are nominated as the best model as per in-sample statistical performance results, whereas according to out-of-sample, the TARCH model is nominated as the best model without transaction costs. The EGARCH and TARCH models outperform all the other models as per to in-sample and out-of-sample trading performance outcomes respectively including transaction costs.
Adsorption kinetics of Rhodamine-B on used black tea leaves
Hossain Mohammad,Alam Md
Iranian Journal of Environmental Health Science & Engineering , 2012, DOI: 10.1186/1735-2746-9-2
Abstract: Rhodamine B (Rh-B) is one of the most common pollutants in the effluents of textile industries effluents in developing countries. This study was carried out to evaluate the applicability of used black tea leaves (UBTL) for the adsorptive removal of Rh-B from aqueous system by investigating the adsorption kinetics in batch process. The effects of concentration and temperature on adsorption kinetics were examined. First-, second- and pseudo-second order kinetic equations were used to investigate the adsorption mechanism. The adsorption of Rh-B on UBTL followed pseudo-second order kinetics. The equilibrium amount adsorbed and the equilibrium concentration were calculated from pseudo-second-order kinetic plots for different initial concentrations of Rh-B to construct the adsorption isotherm. The adsorption isotherm was well expressed by Langmuir equation. The maximum adsorption capacity of UBTL to Rh-B was found to be 53.2 mg/g at pH = 2.0. The equilibrium amount adsorbed, calculated from pseudo-second-order kinetic plots, increased with temperature increase. The positive value of enthalpy of adsorption, ΔHads = 31.22 kJ/mol, suggested that the adsorption of Rh-B on UBTL at pH = 2.0 is an endothermic process.
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