1,722,608 research outputs found
ゴンドワナ・Barapukuria石炭盆地 （北西バングラデシュ）の多層・長壁式採炭に伴う地質学的災害危険分析：数値シミュレーションに基づく評価
Full text link琉球大学博士（学術）This dissertation connects the Boundary Element Method (BEM) and Finite Element Method (EFM) with its practical applications to recognize underground mining related geo-environmental hazards associated with the Gondwana Barapukuria Coal Basin of northwest Bangladesh. .A total of three models are presented to recognize ground movement and water inrush/inflow. The study uses both FEM and BEM numerical analyses to evaluate stress redistribution, strata failure, and water inflow enhancements that result from the coal extraction operations. It is apparent from the fracture heights that large amounts of caving would occur towards the roof due to the multi-slice extraction of coal, and finally would be linked with the water-bearing Dupi Tila Formation. For the case of seam gas outburst, three models are also presented in this study. Model A assumes horseshoe-shaped geometry, model B assumes trapezoid-shaped geometry, and model C assumes horseshoe-shaped geometry coupled with a roof fall-induced cave generated by the break-up of rock materials along the vertical dimension of an igneous dyke. From these simulation results, it is thought that the extension of the dyke-induced perturbation zone toward the roof, floor, and rib sides of the entry roadway initially creates small tensional cracks that gradually grow into large-scale tensional features. These features could also be responsible for high concentrations of gas, which are emitted into the mine from fractured coals due to insufficient mine ventilation and low atmospheric pressure. Mining-induced fault reactivation and its impacts on main conveyor belt roadway have been focused as an adverse geo-hazard for the safe operation of the mine. The simulation results illustrate that the mining-induced redistribution of stresses causes significant deformation within and around the two faults_ Failure trajectories that extend towards the roof and left side of fault indicate that mining-induced reactivation of faults is not sufficient to generate water inflow into the mine. However, if movement of strata occurs along the fault planes due to regional earthquakes, and if the faults intersect the overlying Lower Dupi Tila aquiclude, then liquefaction could occur along the fault zones and enhance water inflow into the mine. Considering all geo-hazards, I recommend for rethinking about coal bed methane (CBM) resource potential rather than underground mining of Barapukuria coal basin.学位論
A paradox of the world population stabilization policy
No full textMd. Mahmudul Alam, Rafiqul Islam Molla, Khondaker Mizanur Rahman, Md. Wahid Mura
Urban Local Government and Environmental Management in Bangladesh: A Study on Chunarughat Paurashava
Full text linkUrban local government is a vital part for the delivery of services to people. Along with other responsibilities, urban local government in Bangladesh is also responsible for environmental management. This study aims to identify the role of Paurashavas (which are administrative units at every municipality composed of elected members) in protecting a healthy and clean environment. Examining Chunarughat Paurashava, the study finds that Paurashavas have an important role in environmental management such as garbage collection, waste disposal, sewerage construction, public park protection, and so on. However, the provision of these kinds of services is hindered by various lacks, like infrastructure, logistic support, trained manpower, and funds, as well as peoples’ participation. The study makes various recommendations to overcome these problems.local government, environmental management, Bangladesh, Paurashava, Chunarughat
Climate Change and Agricultural Growth: An Examination of the Link in Malaysia
No full textMd. Wahid Murad, Rafiqul Islam Molla, Mazlin Bin Mokhtar, Md. Abdur Raqui
Assessment of wind energy potential mapping for Peninsular Malaysia / Mohammad Rafiqul Islam
Full text linkWind energy generation is growing rapidly worldwide and will continue to do so for the foreseeable future. In this study, the most accepted 2-parameter Weibull distribution model has been applied for assessment of wind energy potentiality. The wind directions have been also identified using the WRPLOT View software. The Geographical Information System (GIS), ArcGIS 9.3 software, has been applied to present the predicted monthly and yearly mean wind speed in the form of contour maps. The wind speed data of 15 stations has been collected from the Malaysian Meteorological Department over the period of 2008-2009.
Based on the experimental data, it is found that the numerical values of both Weibull parameters (k and c) for Peninsular Malaysia vary over a wide range. It is found that the daytime, from 8 am to 6 pm, is windy for all the years, while the night time is relatively calm. Most of the monthly mean wind speed values are between 1.5 m/s to 4.5 m/s, but some are over 4.5 m/s and few are under 1.5 m/s. The mean wind speeds for all the years are lower than 4.5 m/s and the range of the yearly mean wind speed values is from 0.90 to 4.06 m/s. It is found that the yearly mean wind speed at Mersing is 4.06 m/s in 2008 and 4.01 m/s in 2009, which is capable of producing commercial wind energy by using current technology.
The monthly highest value of wind power density was found to be 227.1 W/m2 at Mersing in January, 2009 and the lowest value of wind power density was 1.3 W/m2 in November 2008 at Batu Embun. The average value of the monthly wind power density was estimated 26.76 W/m2. The range of the values of monthly wind energy density was found to be between 11.23 to 1962 kWh/m2/year whereas the average wind energy density was found to be 231.20 kWh/m2/year.
Mersing is the most „windy‟ place with the largest scale parameter c, and its most frequent wind speed is 3.5 m/s. The maximum percentage of error between Weibull and observed wind speed frequencies occur at 3 m/s or more than 3 m/s is around 20%. From cumulative distribution function, it is found that Mersing will have the highest operating possibility of 67% (around 5789 hours per year). For all the sites, the prevailing winds from the most probable wind directions on the percentage ranging from 15 to 41% and the wind speeds less than 3 m/s are ranging from 11.2-89.2%.
The geographical parameters (latitude, longitude, and altitude), and months of the year were used as input data, while the monthly and yearly mean wind speeds were found as the output. It is seen that the southern part of Peninsular Malaysia is windier than that of the other parts in Peninsular Malaysia. The predicted wind speed values are given in the form of monthly and yearly maps, which can be easily used for assessment of wind energy potential for different locations within Peninsular Malaysia
How to create a self-sustaining business model for promoting NESCAFE
No full textThis internship report is submitted in a partial fulfillment of the requirements for the degree of Bachelor of Business Administration,2014.Cataloged from PDF version of Internship report.Includes bibliographical references (page 62).Nestlé is world‟s largest health, nutrition and wellness company with a mission of “Good Food, Good Life” which actually drives the company to provide consumers with the best tasting and most nutritious food choices in a wide range of food and beverage categories and eating occasions. Although globally it is twice in size of its near-est FMCG (fast moving consumer goods) competitors, in Bangladesh its journey is compara-tively new. Nestlé Bangladesh Limited, a wholly owned subsidiary of Nestlé S.A., started its commercial production in 1994 .Today Nestlé Bangladesh Limited is strongly positioned to grow through its policy of constant innovation and renovation, concentrating on its core competencies and commitment to high quality, with the aim of providing the best quality food to the people of Bangladesh.
The report is based on a working project and the aim of the report is to figure out how to de-velop a sustainable self-sustaining business model to promote Nescafé and the perception of people about street selling of Nescafé .This report is designed in six major chapters. Initially the opening words about the report were described in the first segment titled “Introduction”. The next segment “Company Profile” contains the history of Nestlé, Product/service offerings, Operational network organogram, Nestlé Bangladesh Ltd. and Visions & mission for the future. Next chapter is about my job and major responsibilities; where i have tried to describe my job and some of its drawbacks. Then comes the project that i was assigned in. In the following part of this I have discussed about the project “Amra Korbo Joy” in details like how to develop a project, its financials and possible future etc. The last & final part contains the concluding part. Before drawing any conclusion based on this report it may be noted that there might be lack in data, but still it may be useful for designing any further study.Md. Rafiqul Islam MithilB. Business Administratio
Japan-Malaysia free trade agreement: expectations and achievements
No full textThe Japan-Malaysia free trade agreement (FTA) was signed in 2005 and implemented from 2006 with the expectation that it would further enhance the trade and investment relationship between the two countries. Yet, research suggests that the trade agreement and other tools for expanding trade between partner countries are substantially losing effectiveness. In light of this phenomenon, this study examines the role and effectiveness of the Japan-Malaysia FTA in influencing their bilateral trade. From analyses of time series data for Malaysia’s trade with the world and Japan, in terms of trade volume, trade share, and rate of growth, it is observed that during the first two years of this FTA, its influence on bilateral trade between these two countries was not significant. This research indicates that the agreement is still at a fledgling stage, and has limited scope for influencing and revamping mutual trade. The results provide weak support for the thesis that formation of a free trade agreement or bloc is an effective tool for enhancing trade between partner countries. Although a two years of engagement is not long enough to test any rigorous model nor draw valid conclusions, a FTA is indeed an effective tool as long as partners do not enter into such arrangements with many countries, which may dilute the anticipated outcome of an agreement between two countries.Khondaker Mizanur Rahman, Rafiqul Islam Molla Md. and Wahid Mura
Circular and ribbon-like silk fibroin nanofibers
No full textSilk fibroin, from Bombyx mori solutions were electrospun into nanofibers with circular and ribbon like morphology. Diameters of the electrospun fibers were ranged from 60 to 7000 nm. The effects of electrospinning temperature, solution concentration and electric field on the formation of nanofibers and their morphology were studied. Optical and scanning electron microscope were used to study the morphology and diameter of electrospun nanofibers. It was observed that the nanofibers morphology depends on the electrospinning parameters and became flattened with ribbon like shape with increasing the electrospinning temperature. The nanofiber diameter increased with the increase in the concentration of silk solution at all electrospinning temperature. Electric field showed different effects on the nanofiber morphology at 25 °C. Referring to the literature the probable mechanism responsible for the change of morphology was pointed out. Response surface methodology (RSM) was used to obtain a quantitative relationship between selected electrospinning parameters and average fiber diameter and its distribution. It was shown that concentration of silk fibroin solution and electrospinning temperature had a significant effect on the fiber diameter
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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