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Search Results: 1 - 10 of 401229 matches for " M. Alamgir "
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A Statistical Study of Socio-economic and Physical Risk Factors of Myocardial Infarction
M. Alamgir,M. Salahuddin
Pakistan Journal of Statistics and Operation Research , 2005, DOI: 10.1234/pjsor.v1i1.113
Abstract: A sample of 506 patients from various hospitals in Peshawar was examined to determine significant socio-economic and physical risk factors of Myocardial Infarction (heart attack). The factors examined were smoking (S), hypertension (H), cholesterol (C), diabetes (D), family history (F), residence (R), own a house (OH), number of dependents (ND), household income (I), obesity and lack of exercise (E). The response variable MI was binary. Therefore, logistic regression was applied (using GLIM and SPSS packages) to analyze the data and to select a parsimonious model. Logistic regression models have been obtained indicating significant risk factors for both sexes, for males and for females separately. The best-selected model for both sexes is of factors S, F, D, H and C. The best-selected model for males is of factors CIFH, S, H, D, C and F, while the best-selected model for females is of factors D, H, C and F.
M. Alamgir, A. Ahsan
Iranian Journal of Environmental Health Science & Engineering , 2007,
Abstract: A total of 7690 tons of municipal solid waste generated daily at the six major cities of Bangladesh, namely, Dhaka, Chittagong, Khulna, Rajshahi, Barisal and Sylhet, as estimated in 2005. Sampling was done at different waste generation sources such as residential, commercial, institutional and open areas, in different seasons. The composition of the entire waste stream was about 74.4% organic matter, 9.1% paper, 3.5% plastic, 1.9% textile and wood, 0.8% leather and rubber, 1.5% metal, 0.8% glass and 8% other waste. The per capita generation of municipal solid waste was ranged from 0.325 to 0.485 kg/cap/day while the average rate was 0.387 kg/cap/day as measured in the six major cities. The potential for waste recovery and reduction based on the waste characteristics are evaluated and it is predicted that 21.64 million US$/yr can be earned from recycling and composting of municipal solid waste.
A unique common fixed point theorem in non-Archimedean Menger PM-spaces
M. Alamgir Khan,Shamsul Haq
International Journal of Mathematical Analysis , 2012,
Influence of Landfill Operation and Tropical Seasonal Variation on Leachate Characteristics: Results from Lysimeter Experiment
Islam M. Rafizul,Muhammed Alamgir
Iranica Journal of Energy and Environment (IJEE) , 2012,
Abstract: This study demonstrates the influence of lysimeter operational condition and tropical seasonal variation of leachate characteristics generated from municipal solid waste (MSW) deposited in landfill lysimeter at KUET campus, Bangladesh. Three different situations of landfill were considered here as well as both the open dump lysimeter-A having a base liner and sanitary landfill lysimeter-B and C at two different types of cap liner were simulated. The leachate characteristics, leachate generation and climatic influence parameter had been continually monitored, from June 2008 to May 2010. This period covers both dry and rainy season. The leachate generation followed the rainfall pattern and the open dump lysimeter-A without top cover was recorded to have the highest leachate generation. Moreover, the open dump lysimeter-A had lower concentration and load of total kjeldahl nitrogen (TKN), ammonia nitrogen (NH4-N) and dissolved organic carbon (DOC), while chemical oxygen demand (COD) and biological oxygen demand (BOD5) concentration were higher compared with sanitary lysimeter-B and C. On the other hand, sanitary lysimeter-B, not only had lowest leachate generation, but also produced reasonably low COD and BOD5 concentration compared with open dump lysimeter-A. Based on evaluated results, it was also concluded that metal concentrations which were comparatively higher in leachate of open dump lysimeter were Ca and K, however, the heavy metal concentrations of Cd, Cu, Zn and Mn, and those apparently lower were metals of Na, Mg and Fe as well as heavy metals of Cr, Pb and Ni. However, significant release of heavy metals under open dump lysimeter was observed compared to sanitary lysimeter. Moreover, meaningful correlation between DOC and leaching of Cu and Pb was observed. Result reveals that lysimeter operational mode had direct effect on leachate quality. Finally, it can be concluded that the knowledge of leachate quality will be useful in planning and providing remedial measures of proper liner system in landfill design and leachate treatment.
Penetrative turbulence associated with mesoscale surface heat flux variations
Jahrul M. Alam,M. Alamgir Hossain
Physics , 2015,
Abstract: This article investigates penetrative turbulence in the atmospheric boundary layer. Using a large eddy simulation approach, we study characteristics of the mixed layer with respect to surface heat flux variations in the range from 231.48 W/m$^2$ to 925.92 W/m$^2$, and observe that the surface heterogeneity on a spatial scale of $20$ km leads to downscale turbulent kinetic energy cascade. Coherent fluctuations of mesoscale horizontal wind is observed at 100m above the ground. Such a surface induced temporal oscillations in the horizontal wind suggest a rapid jump in mesocale wind forecasts, which is difficult to parameterize using traditional one-dimensional ensemble-mean models. Although the present work is idealized at a typical scale (20km) of surface heterogeneity, the results help develop effective subgrid scale parameterization schemes for classical weather forecasting mesoscale models.
Role of NGOs and CBOs in Waste Management
A Ahsan,M Alamgir,NN Nik Daud
Iranian Journal of Public Health , 2012,
Abstract: Background: Developing cities like Khulna, the third largest metropolitan city in Bangladesh, have now begun to confess the environmental and public health risks associated with uncontrolled dumping of solid wastes mainly due to the active participation of non-governmental organizations (NGOs) and community-based organizations (CBOs) in municipal solid waste (MSW) management.Methods: A survey was conducted to observe the present scenarios of secondary disposal site (SDS), ultimate disposal site (UDS), composting plants, medical wastes management and NGOs and CBOs MSW management activities.Results: A total of 22 NGOs and CBOs are involved in MSW management in 31 wards of Khulna City Corporation. About 9 to 12% of total generated wastes are collected by door-to-door collection system provided by mainly NGOs and CBOs using 71 non-motorized rickshaw vans. A major portion of collected wastes is disposed to the nearest SDS by these organizations and then transferred to UDS or to private low-lying lands from there by the city authority. A small portion of organic wastes is going to the composting plants of NGOs.Conclusion: The participation of NGOs and CBOs has improved the overall MSW management system, especially waste collection process from sources and able to motivate the residents to store the waste properly and to keep clean the premises.
Modified Weighted Kaplan-Meier Estimator
Mohammad Shafiq,Shuhrat Shah,M. Alamgir
Pakistan Journal of Statistics and Operation Research , 2007, DOI: 10.1234/pjsor.v3i1.75
Abstract: In many medical studies majority of the study subjects do not reach to the event of interest during the study period. In such situations survival probabilities can be estimated for censored observation by Kaplan Meier estimator. However in case of heavy censoring these estimates are biased and over estimate the survival probabilities. For heavy censoring a new method was proposed (Bahrawar Jan, 2005) to estimate the survival probabilities by weighting the censored observations by non-censoring rate. But the main defect in this weighted method is that it gives zero weight to the last censored observation. To over come this difficulty a new weight is proposed which also gives a non-zero weight to the last censored observation.
Potential Visitors of Mirpur Zoological Garden as an Outdoor Recreation Area of Dhaka, Bangladesh
M. Jashimuddin, M. Alamgir,M. Alamgir,R. Majumder,M.R.A. Patwary
Pakistan Journal of Biological Sciences , 2004,
Abstract: The study describes the potential visitors of Mirpur Zoological garden, an outdoor recreation area of Dhaka, Bangladesh. The maximum number of visitors was found in the age of below 30 years (72%) and older age groups represents only 28%. Sixty three percent male and 37% female constitute the visitors group in the study area. Literate person constitutes about 93% and student represents 38% visitors in the study area. About 40% visitors are employed. Most of the visitors (62%) were found visiting in family groups and the least numbers (5%) were visiting alone. Maximum visitors (45%) have come from medium family and the lowest numbers (18%) were from rich family. Maximum number of visitors (36%) visit the area with a cost of 51-100 Tk. Maximum visitors (76%) of the study area is city dwellers. Highest number of visitors (71%) preferred to get recreation in the holidays. It was found that most of the visitors (40%) visit the garden more than twice, 33% visit the garden twice and the least number (26%) visitors have not visited the area before. Maximum visitors (67%) stay at the zoological garden for 2-3 h and only 3% visitors stay in the garden for whole day.
An Object-oriented Approach to Support Faster Retrieve and Manipulation of Spatial Data
M.S. Hossain,M. Alamgir,M.S. Hossain
Asian Journal of Information Technology , 2012,
Abstract: Spatial data are inherently complex because they deal with location as well as spatial variation, distribution, and interaction of the spatial features in the environment. Further, they are characterized by their multidimensional nature, involving large storage of data and therefore high processing cost. Spatial database are developed using relational data model, resulting unacceptable performance during retrieving and manipulation of data. On the other hand, object-oriented data model can be seen as an appropriate alternative at this point. The paper will present a comparison between the two approaches, in the light of their database architectures, in handling spatial data. This is followed by the object-oriented presentation of the implementation framework for one of the complex spatial data models (polygon). The complexity analysis between relational and object-oriented approaches taking the mentioned data model (polygon) into account will also be presented. This will demonstrate that object-oriented approach provides a better way in retrieving spatial data.
Analysis of Errors Involved in the Estimation of Leachate Pollution Index Due to Nonavailability of Leachate Parameter
Islam M. Rafizul,Mahmud M. Minhaz,1Muhammed Alamgir
Iranica Journal of Energy and Environment (IJEE) , 2012,
Abstract: An important part of maintaining a solid waste landfill is managing the leachate through proper treatment to prevent pollution into the surrounding ground and surface water. Any assessment of potential impact of a landfill on groundwater quality requires consideration of the component of leachate most likely to cause an envionental impact as well as the source of concentration of those components. Leachate pollution index (LPI) is an environmental index used to quantify and compare the leachate contamination potential of solid waste landfill. This index is based on concentration of 18 pollutants in leachate and their corresponding significance. That means, for calculating the LPI of a landfill, concentration of these 18 parameters are to be known. However, sometimes the data for all the 18 pollutants included in the LPI may not be available to calculate the LPI. In this study, the possible errors involved in calculating the LPI due to nonavailability of data are reported by the author. The leachate characteristic data for solid waste landfill at Chittagong in Bangladesh have been used to estimate these errors. Based on this study, it can be concluded that the errors may be high if the data for the pollutants having significantly high or low concentration are not available. However, LPI can be reported with a marginal error if the concentrations of the nonavailable pollutants are not completely biased.
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