Khan M.N.H.,Uttara University |
Hasan M.R.,International Islamic University Malaysia |
Alam M.K.,Petronas University of Technology
Indonesian Journal of Electrical Engineering and Computer Science | Year: 2016
Electricity generation purposes renewable energy brings a important role especially Photovoltaic (PV) panels that can be covered our basic energy (electricity) needs. This photovoltaic panels cover a domestic level (solar power for home), commercially (solar power for commercial applications) or at the community level. Here used this photovoltaic panel as an input of PV-transformer-less inverter topology which has been compared with existed H6 transformer-less inverter topology. It’s possible to reduce the leakage current with inclined the output voltage that has been shown here by using proposed topology. This topology is made by using two extra switches with filter. Moreover, overall system actually verified with Pulse Width Modulation (PWM) switching technique. © 2016 Institute of Advanced Engineering and Science. All rights reserved.
Islam Md.D.,Uttara University |
Parvez A.,Uttara University |
Rahman M.,Uttara University
ECCE 2017 - International Conference on Electrical, Computer and Communication Engineering | Year: 2017
This paper proposes a concept that can be applied to increase the output voltage of a wind turbine in low wind speed areas. A simple and cost efficient model is introduced which follows sequential procedures to amplify the minimal generated voltage. Traditional wind turbines are mostly AC generator oriented, whereas this model deals with DC wind turbine, since this technology is becoming more and more promising day by day. The approach presented in this paper illustrates the simple way of increasing the wind speed, amplifying the generated voltage of wind turbine by mechanical system, and finally stabilizing the output voltage for DC applications. To be specific, this is a nozzle augmented DC wind turbine where the nozzle is used to boost the wind speed. Then a gear coupling is being introduced in the intermediate stage to further increase the generated voltage. At the end, a DC voltage stabilizer is used prior to final usable DC output. It is expected that, this novel approach will play a vital role in improving the output voltage of a DC wind turbine.
Islam S.M.R.,Bangladesh University |
Khan K.,Bangladesh University |
Woadud K.M.A.A.,Uttara University
Waves in Random and Complex Media | Year: 2017
The enhanced (G′/G)-expansion method presents wide applicability to handling nonlinear wave equations. In this article, we find the new exact traveling wave solutions of the Benney–Luke equation by using the enhanced (G′/G)-expansion method. This method is a useful, reliable, and concise method to easily solve the nonlinear evaluation equations (NLEEs). The traveling wave solutions have expressed in term of the hyperbolic and trigonometric functions. We also have plotted the 2D and 3D graphics of some analytical solutions obtained in this paper. © 2017 Informa UK Limited, trading as Taylor & Francis Group
Ahmed Z.U.,Cornell University |
Panaullah G.M.,Uttara University |
Gauch Jr. H.,Cornell University |
McCouch S.R.,Cornell University |
And 3 more authors.
Plant and Soil | Year: 2011
Genetic analysis of 38 rice varieties released by the Bangladesh Rice Research Institute (BRRI) identified 34 as indica, 2 as admixed between indica and aus, and 4 as belonging to the aromatic/Group V subpopulation. Indica varieties developed for the two major rice-growing seasons, the wet monsoon (aman) and the dry winter (boro), were not genetically differentiated. The Additive Main Effect and Multiplicative Interaction (AMMI) model was used to assess the effect of genotype (G), environment (E) and genotype-environment interaction (GEI) on grain arsenic (As) concentration when these rice varieties were grown at ten BRRI research stations located across diverse agro-ecological zones in Bangladesh. G, E and GEI, significantly influenced grain As concentration in both seasons. Overall, E accounted for 69%-80%, G 9%-10% and GEI 10%-21% of the observed variability in grain As. One site, Satkhira had the highest mean grain As concentration and the largest interaction principle component analysis (IPCA) scores in both seasons, indicating maximum interaction with genotypes. Site effects were more pronounced in the boro than in the aman season. The soil level of poorly crystalline Fe-oxide (AOFe), the ratio of AOFe to associated As, soil phosphate extractable As and soil pH were important sub-components of E controlling rice grain As concentration. Irrespective of environment, the mean grain As concentration was significantly higher in the boro (0.290 mg As kg-1) than in the aman (0.154 mg As kg-1) season (p < 0.0001), though the reasons for this are unclear. Based on mean grain As concentration and stability across environments, the variety BR3 is currently the best choice for the boro season, while BR 23 and BRRI dhan 38 are the best choices for the aman season. Popular varieties BR 11 (aman) and BRRI dhan 28 and 29 (boro) had grain As concentrations close to the mean value and were fairly stable across environments, while high-yielding, short-duration aman season varieties (BRRI dhan 32, 33 and 39) developed for intensified cropping had relatively high grain As concentrations. Results suggest that genetic approaches to reducing As in rice grain will require the introduction of novel genetic variation and must be accompanied by appropriate management strategies to reduce As availability and uptake by rice. © 2010 Springer Science+Business Media B.V.
Sarriot E.G.,ICF International |
Kouletio M.,U.S. Embassy |
Jahan S.,Uttara University |
Rasul I.,Concern Worldwide |
Musha A.K.M.,House 15 SW D
Health and Quality of Life Outcomes | Year: 2014
Background: Starting in 1999, Concern Worldwide Inc. (Concern) worked with two Bangladeshi municipal health departments to support delivery of maternal and child health preventive services. A mid-term evaluation identified sustainability challenges. Concern relied on systems thinking implicitly to re-prioritize sustainability, but stakeholders also required a method, an explicit set of processes, to guide their decisions and choices during and after the project. Methods: Concern chose the Sustainability Framework method to generate creative thinking from stakeholders, create a common vision, and monitor progress. The Framework is based on participatory and iterative steps: Defining (mapping) the local system and articulating a long-term vision, describing scenarios for achieving the vision, defining the elements of the model, and selecting corresponding indicators, setting and executing an assessment plan, and repeated stakeholder engagement in analysis and decisions. Formal assessments took place up to 5 years post-project (2009). Results: Strategic choices for the project were guided by articulating a collective vision for sustainable health, mapping the system of actors required to effect and sustain change, and defining different components of analysis. Municipal authorities oriented health teams toward equity-oriented service delivery efforts, strengthening of the functionality of Ward Health Committees, resource leveraging between municipalities and the Ministry of Health, and mitigation of contextual risks. Regular reference to a vision (and set of metrics (population health, organizational and community capacity) mitigated political factors. Key structures and processes were maintained following elections and political changes. Post-project achievements included the maintenance or improvement 5 years post-project (2009) in 9 of the 11 health indicator gains realized during the project (1999-2004). Some elements of performance and capacity weakened, but reductions in the equity gap achieved during the project were largely maintained post-project. Conclusions: Sustainability is dynamic and results from local systems processes, which can be strengthened through both implicit and explicit systems thinking steps applied with constancy of purpose. © 2014 Sarriot et al.
Bagmar M.S.H.,University of Dhaka |
Khudri M.M.,Uttara University
Pakistan Journal of Nutrition | Year: 2015
Over the past decade Bangladesh has maintained an impressive track record of economic growth and poverty reduction. Despite achieving significant progress in the aforementioned sectors, Bangladesh lags far behind in case of child malnutrition. This study endeavors to track the trend in child malnutrition status in terms of different indicators over the past decade in Bangladesh. The study also investigated differential impact of some characteristics belonging to child, mother and household on nutritional status. The data extracted from BDHS (2004, 2007, 2011) were used for this purpose. Pearson’s chi-square and binary logistic regression model were employed to identify the determinants of child malnutrition. Cutbacks in stunting and underweight status were observed whereas the number of wasted child was increased from BDHS (2004) to BDHS (2011). A child aged less than or equal to two years had lower risk of being stunted or under weighted in comparison with the child aged 2 to 5 years. It was found that the child whose mother was less educated was more likely to suffer from malnutrition than a well educated mother’s child. It is also discerned that the child belonging to poor family or having no toilet facility was more likely to be malnourished comparing to the child belonging to non-poor family and getting better toilet facility. © Asian Network for Scientific Information, 2015.
Islam M.D.,Uttara University |
Mondol A.S.,Rhine-Waal University of Applied Sciences
8th International Conference on Electrical and Computer Engineering: Advancing Technology for a Better Tomorrow, ICECE 2014 | Year: 2015
This paper introduces a new clinical thermometer named as 'Braille Thermometer' which will be used for measuring the body temperature of patients who are blind and also have hearing problem (deaf-blind). It is actually a microcontroller based device which collects temperature through a temperature sensor and indicates this temperature in a dial which is marked in Braille numbers. In this paper, the temperature readings of the Braille thermometer are also crosschecked with the readings of a clinical thermometer where input temperature was taken from the same source. © 2014 IEEE.
Islam C.S.,Uttara University
2015 18th International Conference on Computer and Information Technology, ICCIT 2015 | Year: 2015
The goal of this paper is to design a new interference alignment (IA) precoders and decoders algorithm capable of finding perfect alignment solutions which is similar to the AltMin-IA in terms of convergence speed and reliability. Finally, extended the AltMin-IA algorithm to incorporate the rank constraint in the form of a minimum eigenvalue condition, and a transmit power constraint, which results in a generalized eigenvalue problem at each step of the alternating optimization procedure. In the interference channel (IC), K transmitter-receiver pairs exploit the channel state information (CSI) to jointly design their transmit strategies. Specifically here, consider orthogonal frequency-division multiplexing (OFDM) transmissions, where the application of existing IA algorithms require an additional level of cooperation; time synchronization. To avoid such demand, apply the precoders and decoders at the sample level in the time domain, which allows the users to transmit asynchronously. © 2015 IEEE.
Ahmed Z.U.,Cornell University |
Panaullah G.M.,Uttara University |
DeGloria S.D.,Cornell University |
Duxbury J.M.,Cornell University
Science of the Total Environment | Year: 2011
Knowledge of the spatial correlation of soil arsenic (As) concentrations with environmental variables is needed to assess the nature and extent of the risk of As contamination from irrigation water in Bangladesh. We analyzed 263 paired groundwater and paddy soil samples covering highland (HL) and medium highland-1 (MHL-1) land types for geostatistical mapping of soil As and delineation of As contaminated areas in Tala Upazilla, Satkhira district. We also collected 74 non-rice soil samples to assess the baseline concentration of soil As for this area. The mean soil As concentrations (mg/kg) for different land types under rice and non-rice crops were: rice-MHL-1 (21.2) > rice-HL (14.1) > non-rice-MHL-1 (11.9) > non-rice-HL (7.2). Multiple regression analyses showed that irrigation water As, Fe, land elevation and years of tubewell operation are the important factors affecting the concentrations of As in HL paddy soils. Only years of tubewell operation affected As concentration in the MHL-1 paddy soils. Quantitatively similar increases in soil As above the estimated baseline-As concentration were observed for rice soils on HL and MHL-1 after 6-8. years of groundwater irrigation, implying strong retention of As added in irrigation water in both land types. Application of single geostatistical methods with secondary variables such as regression kriging (RK) and ordinary co-kriging (OCK) gave little improvement in prediction of soil As over ordinary kriging (OK). Comparing single prediction methods, kriging within strata (KWS), the combination of RK for HL and OCK for MHL-1, gave more accurate soil As predictions and showed the lowest misclassification of declaring a location "contaminated" with respect to 14.8. mg As/kg, the highest value obtained for the baseline soil As concentration. Prediction of soil As buildup over time indicated that 75% or the soils cropped to rice would contain at least 30. mg/L As by the year 2020. © 2011 Elsevier B.V.
Khudri M.M.,Uttara University |
Sultana S.,Uttara University
British Food Journal | Year: 2015
Purpose - The purpose of this paper is to seek the determinants of service quality and evaluate the impact of service quality and consumers’ characteristics on channel selection in the context of beverage industry in Bangladesh. Design/methodology/approach - Data were collected using convenience sampling method. Initially exploratory factor analysis was performed to extract the key dimensions of service quality and then confirmatory factor analysis structural equation modeling was employed to verify the causal relationships between the dimensions of service quality and service quality itself. χ2 test was used to determine whether any association exists between service quality or demographic variables and choice of channel types. Cramer’s V was performed to measure the strength of association. One-way ANOVA was carried out to identify significant impact of demographic variables on perception of service quality. Findings - The research findings indicated that personal interaction, appearance, reliability, policy, and problem solving are the key determinants of service quality in terms of beverage industry in Bangladesh. It is observed that customers preferring factors like personal interaction and problem solving intend to purchase beverage items from super shop. Customers who are deemed socioeconomically high taking profession and monthly income into account prefer shopping at super shop. Customers who are female or married with no kid or service holders showed better satisfaction with service quality. Research limitations/implications - Due to money and time constraints the study could not cover up the whole country. Conclusions and predictions to be applied to consumers in general may not be appropriate entirely since specific age group was deemed, given that the subject was beverage products. Practical implications - The model proposed in this study will help managers and suppliers understand how consumers assess the quality of services. In order to strengthen brand and create brand loyalty, marketing planners, managers, and suppliers must be aware of the dimensions of service quality, and consumers’ characteristics. Selecting an optimal sales channel is imperative for suppliers in order to make their products reach to target consumers. Originality/value - Service quality plays crucial role in ameliorating customer satisfaction and creating competitive advantage whereas sales channels have impact on sustaining the long-term profitability of the company. This paper has contributed significantly to these issues and sought consumers’ characteristics and preference as well. © Emerald Group Publishing Limited.