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Search Results: 1 - 10 of 2184 matches for " Sharif Hossain "
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An Econometric Analysis for CO2 Emissions, Energy Consumption, Economic Growth, Foreign Trade and Urbanization of Japan  [PDF]
Sharif Hossain
Low Carbon Economy (LCE) , 2012, DOI: 10.4236/lce.2012.323013
Abstract: This paper examines the dynamic causal relationship between carbon dioxide emissions, energy consumption, economic growth, foreign trade and urbanization using time series data for the period of 1960-2009. Short-run unidirectional causalities are found from energy consumption and trade openness to carbon dioxide emissions, from trade openness to energy consumption, from carbon dioxide emissions to economic growth, and from economic growth to trade openness. The test results also support the evidence of existence of long-run relationship among the variables in the form of Equation (1) which also conform the results of bounds and Johansen conintegration tests. It is found that over time higher energy consumption in Japan gives rise to more carbon dioxide emissions as a result the environment will be polluted more. But in respect of economic growth, trade openness and urbanization the environmental quality is found to be normal good in the long-run.
Liberalizing Agriculture by OECD Countries: Welfare, Growth and Distributional Impact in Developing Countries
Sharif Mosharraf Hossain
International Journal of Economics and Finance , 2011, DOI: 10.5539/ijef.v3n3p167
Abstract: Although it is often argued that liberalization provides opportunities for growth and development in all over the world, there are divergent views about the effects of agricultural trade liberalization on growth and income distribution in developing countries. The developing countries’ main complaint in this regard is that trade distorting activities in agriculture by developed countries adversely affecting their exports and consequently growth, and income and employment of the people therein. There is a general perception among the policymakers and academia that the developing countries would gain much from the removal of existing distortion in the agricultural market because of the tremendous importance of the agricultural sector in their economies. The current paper has analyzed the effect of trade liberalization in agriculture on welfare, growth and income distribution in developing countries, using a computable general equilibrium (CGE) model and indicates that the effect is not similar for all the developing countries.
Power Quality Improvement of Large Power System Using a Conventional Method  [PDF]
Nazmus Sahadat, Shakhawat Hossain, Arifur Rahman, Sharif Taufique Atique
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.38100
Abstract: Operation of a large power system with maintaining proper power quality is always been a difficult task. It becomes more difficult to maintain the power quality when rapid expansion of previously designed power system occurred. To redesign of such a power system is not feasible and also cost effective. To improve the quality of power of such a large system, conventional methods of compensation can be used. In this paper a power system of 419 buses is analyzed. It is found that 76 buses have under voltage problem. Conventional shunt compensation method is used by connecting capacitor in parallel to the bus. After compensation the system is simulated again and found that the under voltage problem of this large power system is removed. Power factor of the system is also improved.
Conjugate Effect of Radiation and Thermal Conductivity Variation on MHD Free Convection Flow for a Vertical Plate  [PDF]
Rowsanara Akhter, Mohammad Mokaddes Ali, Babul Hossain, M. Sharif Uddin
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.33035
Abstract:

A numerical investigation is performed to study the effect of thermal radiation on magnetohydrodynamic (MHD) free convection flow along a vertical flat plate in presence of variable thermal conductivity in this paper. The governing equations of the flow and the boundary conditions are transformed into dimensionless form using appropriate similarity transformations and then solved employing the implicit finite difference method with Keller-box scheme. Results for the details of the velocity profiles, temperature distributions as well as the skin friction, the rate of heat transfer and surface temperature distributions are shown graphically. Results reveal that the thermal radiation is more significant in MHD natural convection flow during thermal conductivity effect is considered. To illustrate the accuracy of the present results, the results for the local skin fraction and surface temperature distribution excluding the extension effects are compared with results of Merkin and Pop designed for the fixed value of Prandtl number and a good agreement were found.


Grid-Connected Emergency Back-Up Power Supply  [PDF]
Dhiman Chowdhury, Mohammad Sharif Miah, Md. F. Hossain
Circuits and Systems (CS) , 2019, DOI: 10.4236/cs.2019.101001
Abstract: This paper documents design and modeling of a grid-connected emergency back-up power supply for medium power applications. Back-up power supplies are very important in regard to support electrical loads in the events of grid power outage. However, grid-integration of a back-up power supply substantiates continual power transfer to the loads, especially to the critical loads, which should not suffer from power interruptions. Therefore, design and circuit modeling of switching converters based reliable grid-tied emergency back-up power supply are presented in this paper. There are a rectifier-link boost derived battery charging circuit and a 4-switch push-pull power inverter circuit which are controlled by high frequency pulse width modulation (PWM) signals. This paper presents a state averaging model and Laplace domain transfer function of the charging circuit and a switching converter model of the power inverter circuit. A changeover relay based transfer switch controls the power flow towards the utility loads. During off-grid situations, loads are fed power by the proposed inverter circuit and during on-grid situations, battery is charged by an ac-link rectifier-fed boost converter. However, there is a relay switching circuit to control the charging phenomenon of the battery. The proposed design is simulated in PLECS and the simulation results corroborate the reliability of the presented framework.
Determination of abscisic acid hormone (ABA), mineral content, and distribution pattern of 13C photoassimilates in bark-ringed young peach trees
A. B. M. Sharif Hossain
Maejo International Journal of Science and Technology , 2008,
Abstract: Abscisic acid (ABA), mineral content, and 13C photoassimilates in young leaf, shoot and root of peach trees (Prunus persica Batsch cv. Hikawahakuho) as affected by phloemic stress (bark ring) were studied. The trees were treated as control (no phloem ringing), partial phloem ringing (PR) and complete ringing (CR). Phloem ringing was made by peeling out 2 cm length of bark (phloem) from the trunk leaving a connecting 2 mm thickness of phloem strip (a band) while complete ringing (CR) left no phloem strip. Free, bound and total ABA content in peach shoot and leaf were higher in CR and PR treated trees than in control trees. The N and Ca content in the root were higher in PR and CR than in control. 13C photoassimilates were higher in leaf, shoot and upper trunk in PR and CR than in control. The results show that PR and CR increase ABA content in leaf, 13C photoassimilate content in shoot and leaf, and mineral content in root. The increase in the hormone (ABA) and mineral content in the leaf and root seems to affect the overall plant nutrition that leads to small-sized peach trees.
A Dynamic Causality Study between Electricity Consumption and Economic Growth for Global Panel: Evidence from 76 Countries
Md. Sharif Hossain,Chikayoshi Saeki
Asian Economic and Financial Review , 2012,
Abstract: This paper empirically examines the dynamic causal relationships between electricity consumption and economic growth for five different panels (namely high income, upper middle income, lower middle income, low income based on World Bank income classification and global) using time series data from 1960 to 2008. Three panel unit root tests results support that both the variables are integrated of order 1 for all panels except low income panel. Only the variable economic growth is integrated of order 1 for low income panel. The Kao and Johansen Fisher panel conintegration tests results support that both the variables are cointegrated for high income, upper middle income and global panels but for lower middle income and low income panels are not cointegrated. Bidirectional causality between economic growth and electricity consumption both in the short-run and long-run is found for high income, upper middle income and global panels from the Granger causality test results. Unidirectional short-run causality is found from economic growth to electricity consumption for lower middle income panel and no causal relationship is found for low income panel. It is found that the long-run elasticity of economic growth with respect to electricity consumption is higher for high income, upper middle income and for global panels indicates that over times higher electricity consumption gives rise to more economic growth in these panels.
Effect of ethanol on the longevity and abscission of bougainvillea flower
A. B.M.Sharif Hossain
Maejo International Journal of Science and Technology , 2007,
Abstract: The experiment was carried out to study the effect of different concentrations of ethanol on bougainvillea flower vase life and delay abscission. Young and fresh flowers were harvested from 4 years bougainvillea trees randomly. Flower stems (petiole) were placed individually in an open solution containing different concentrations of ethanol immediately after harvesting and were placed at 28 0C of room temperature. The treatments were water control, 2, 4, 8, 10, 20, 30, 40, 50 and 70% ethanol. Positive response was found in case of 8 and 10% ethanol after 5 days of treatment. Dry weight was higher in lower concentration of ethanol and lower in higher concentration. Flower longevity was 2 days more in 8 and 10% ethanol than water control and other concentrations of ethanol. Petal wilting and abscission occurred 2 days later than water control. Perianth abscission was later in 8 and 10% ethanol than water control. Percent petal scar (color changing) was later in water control, 2, 4, 8 and 10 than 20, 30, 40, 50 and 70% ethanol The result showed flower vase life was significantly affected by ethanol concentrations and longevity was more in 8 and 10% ethanol than water control and other concentrations.
Investigation of the Phytochemicals, Antioxidant, and Antimicrobial Activity of the Andrographis paniculata Leaf and Stem Extracts  [PDF]
Shakil Ahmed Polash, Tanushree Saha, Md. Sharif Hossain, Satya Ranjan Sarker
Advances in Bioscience and Biotechnology (ABB) , 2017, DOI: 10.4236/abb.2017.85012
Abstract: Andrographis paniculata (Kalmegh) has been considered as a medicinal shrub and used as a medicinal plant in the remote areas of Bangladesh. A. paniculata leaf and stem extracts were prepared using the polar (i.e., water, and 70% ethanol) and nonpolar (i.e., hexane) solvents. The phytochemical contents, total phenol contents (TPC), antioxidant activity, and antibacterial activity of all the extracts of A. paniculata leaf and stem were investigated. Both the gram-positive (i.e., Bacillus subtillis) and gram-negative (i.e., E. coli, and Salmonella typhi) strains of bacteria were used for the antibacterial activity assay of the sample extracts. The ethanolic stem extracts contained the maximum amount of TPC when compared to that of the leaf extracts. However, the aqueous stem extracts had the highest free radical scavenging activity in vitro. The extracts prepared from A. paniculata stem showed better antibacterial activity against all the strains of bacteria (i.e., E. coli, S. typhi, and B. subtillis) when compared to that of the leaf extracts. More specifically, the aqueous stem extract showed superior antibacterial effect against E. coli, and B. subtillis, and the zones of inhibition were 21 mm, and 29 mm in diameter, respectively. On the other hand, the ethanolic stem extract showed the maximum antibacterial activity against S. typhi and the zone of inhibition was 8.15 mm. The minimum inhibitory concentration (MIC) value and IC50 value for all the A. paniculata extracts were ~0.05 μg/μL, and ~1 μg/μL, respectively.
Investigation of the Phytoconstituents and Bioactivity of Various Parts of Wild Type and Cultivated Phyllanthus emblica L.  [PDF]
Ratna Mondal, Shakil Ahmed Polash, Tanushree Saha, Zinia Islam, Md. Maniruzzaman Sikder, Nuhu Alam, Md. Sharif Hossain, Satya Ranjan Sarker
Advances in Bioscience and Biotechnology (ABB) , 2017, DOI: 10.4236/abb.2017.87016
Abstract: Phyllanthus emblica L. belonging to the family Euphorbiaceae is a common medicinal plant in Bangladesh. In order to evaluate the phytoconstituents and bioactivity of various parts of P. emblica, both the wild type (i.e., small) and cultivated (i.e., big) fruits were collected from the local market of Bangladesh and six ethanolic extracts were prepared from various parts of the collected fruits for this current study. A comparative analysis of the phytochemical compositions and various bioactivities especially antibacterial, antifungal, and antioxidant activity of the six ethanolic extracts were accomplished. The qualitative phytochemical analysis of plant extracts revealed the presence of large amounts of proteins, carbohydrates, phenolic compounds, glycosides, alkaloids, coumarins, flavonoids, tannins, saponins and resins etc. The maximum antioxidant activity was observed for wild type P. emblica seed extracts and the minimum activity was observed for cultivated flesh extracts. Moreover, among the samples the wild type P. emblica extracts have excellent amount of total phenol contents and the highest free radical scavenging activity. It is also found that
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