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MEASUREMENT OF REACTIVITY OF THE FUEL AND CORE EXCESS REACTIVITY OF THE BTRR
(202-02-01) ( 202028001), ABSAR HANZALA SAMI
Newsletter 2007, Issue 11: (Jul-Dec 2007)
(R&D Wing, MIST, 2007)
Newsletter 2008, Issue 13: (Jul-Dec 2008)
(R&D Wing, MIST, 2008)
MIST Newsletter 2008, Issue 12: (Jan-Jun 2008)
(R&D Wing, MIST, 2008-12)
Newsletter 2009, Issue 14: (Jan-Jun 2009)
(R&D Wing, MIST, 2009)
Newsletter 2009, Issue 15: (Jul-Dec 2009)
(R&D Wing, MIST, 2009)
Countrywide internet connectivity using WIMAX development can boost Rural Development of Bangladesh
(Research and Development Wing, MIST, 2009-01) Hossain, Md. Azmal; Islam, Lt Cdr MD. Shahedul; Haque, Md. Rakibul
Being a popular mechanism for access based networks; wireless access medium has found its growth potentials unmatched against wired medium in areas which require rapid rollout and has constraints to infrastructure. Right now Bangladesh is experiencing a boom in Internet usage starting from 2002 when prices of access devices started to be slashed, providing options to home users to dream on wireless connectivity. After the establishment of the NFAP, it is possible to create a structured wireless access network throughout Bangladesh. A developing country which has limited infrastructure will find it increasingly difficult to compare WiMAX with access network technologies such as CDMA and GSM. In this article, I have tried to provide information which would make it logical for the development of rural people for a nationwide WiMAX deployment. As networks such as WiMAX require large bandwidth as well as supporting infrastructure, therefore the deployment of fiber optic infrastructure throughout the country would enhance the WiMAX network flourish. Fiber @ Home is the first company which acquires the NTTN (Nationwide Telecommunications Transmission Network) license in Bangladesh, issued by the BTRC is responsible to cover Bangladesh by laying out fiber optic network that will eventually become the major backbone for all kinds of telecommunications and electronic entertainment services, we are enjoying these days. A WiMAX based infrastructure deployment of such a large scale is principally dependent on the frequency allocation for the operator. And the operator will use 2.5GHz or 3.5GHz for the nationwide WiMax deployment.
Integration of telecommunication in passport making process- a pseudo means to reduce travel demand and other sufferings
(Research and Development Wing, MIST, 2009-02) Islam, Major Md. Kabirul; Hoque, Md. Shamsul
Telecommunication or Information Communication Technologies (ICT) that is changing rapidly every aspects of life, is also bringing significant changes in the traditional concept of transportation. Like other telecom enabled services (1), telecom enabled passport making process has the potential to reduce significant travel demand and associated sufferings of the clients, hence of the society. On this consideration, existing passport making, renewal, amendment processes have been critically analyzed in this paper to identify the amount and pattern of physical trips and associated sufferings involved in these processes as well as to explore the way of how telecommunication or ICT can gainfully be integrated with the system. The analysis found that for the purpose of passport making, renewal and amendment process daily approximately 18,000 trips are made around Dhaka passport office. Most of these trips are made during the peak periods availing the highly congested city transport network spending huge amount of fuel, time, money and labor. It is further estimated that effective integration of ICT in the existing system can reduce or convert 63-75 percent physical trips to Fuel Free (FF) electronic trips. In addition, ICT enabled system can also speed up and simplify the process, minimize massive paper works and corruptions, ease up the social sufferings, and increase the productivity of the system. It is expected that this study would help the transport planners and policy makers‟ better way of understanding how the ICT can reduce the need for travel demand in different fields and thereby solve local traffic induced problems.
AN ALGORITHM TO DETERMINE OPTIMAL PATH FOR GIS BASED ROAD NETWORK
(R&D Wing, MIST, 2009-02) Siddique, M.A.Q.; Shamsuddoha, Md.
Traffic congestion is becoming a serious problem in modern cities across the globe. With the complex network of a modern city, finding optimal path for road user is a challenging task. Network analysis in Geographic Information Systems (GIS) provides strong decision support for users in searching shortest route, which considers only a single network weight. Unlike other shortest path algorithm, the author developed an algorithm which could be extensively used for GIS based global position of transport network to determine optimal path. A network matrix were generated using adjacent nodes (vertices) and travel cost (travel time). Another turn matrix was generated using adjacent nodes of intersection to estimate intersection delay and turn control. The algorithm was implemented in C++ environment.
FIELD ORIENTED SPEED CONTROL OF INDUCTION MOTOR DRIVES
(R&D Wing, MIST, 2009-02) Khatoon, Afsana; Rahman, Md. Shaifur
This paper presents the field oriented control of a three phase induction motor up to base speed to investigate the improved performances of an induction motor driven by a PI controller by using a commercially available software package Matlab/Simulink. The concept of field – orientated control (FOC), an indirect method of vector control method, has been selected to be the motion control technique because it produces controlled results that have a better dynamic response to torque variations in a wider speed range compared to other scalar methods. A PI type speed controller has been designed to investigate the performance of IM drives.
FIELD ORIENTED SPEED CONTROL OF INDUCTION MOTOR DRIVES
(R&D Wing, MIST, 2009-02) Khatoon, Afsana; Shaifur Rahman, Md.
This paper presents the field oriented control of a three phase induction motor up to base speed to investigate the improved performances of an induction motor driven by a PI controller by using a commercially available software package Matlab/Simulink. The concept of field – orientated control (FOC), an indirect method of vector control method, has been selected to be the motion control technique because it produces controlled results that have a better dynamic response to torque variations in a wider speed range compared to other scalar methods. A PI type speed controller has been designed to investigate the performance of IM drives.
INTREGRATION OF TELECOMMUNICATION IN PASSPORT MAKING PROCESS - A PSEUDO MEANS TO REDUCE TRAVEL DEMAND AND OTHER SUFFERINGS
(R&D Wing, MIST, 2009-02) Kabirul Islam, Major Md.; Hoque, Md. Shamsul
Telecommunication or Information Communication Technologies (ICT) that is changing rapidly every aspects of life, is also bringing significant changes in the traditional concept of transportation. Like other telecom enabled services (1), telecom enabled passport making process has the potential to reduce significant travel demand and associated sufferings of the clients, hence of the society. On this consideration, existing passport making, renewal, amendment processes have been critically analyzed in this paper to identify the amount and pattern of physical trips and associated sufferings involved in these processes as well as to explore the way of how telecommunication or ICT can gainfully be integrated with the system. The analysis found that for the purpose of passport making, renewal and amendement process daily approximately 18,000 trips are made around Dhaka passport office. Most of these trips are made during the peak periods availing the highly congested city transport network spending huge amount of fuel, time, money and labor. It is further estimated that effective integration of ICT in the existing system can reduce or convert 63-75 percent physical trips to Fuel Free (FF) electronic trips. In addition, ICT enabled system can also speed up and simplify the process, minimize massive paper works and corruptions, ease up the social sufferings, and increase the productivity of the system. It is expected that this study would help the transport planners and policy makers’ better way of understanding how the ICT can reduce the need for travel demand in different fields and thereby solve local traffic induced problems.
STUDY OF AERODYNAMICS OF A CRICKET BALL
(R&D Wing, MIST, 2009-02) Shameem Mahmood Ebna Hai, Bhuiyan; Md. Abdus Salam, Wing Commander
This research is concerned with the nature and aerodynamic behavior on cricket balls in flight. It is written to determine the aerodynamic characteristics of a cricket ball with a mass of 156 gm and approximate diameter of 70 mm, where a sample cricket ball was fixed with a shaft in a wind tunnel. The aerodynamic characteristics have been analyzed by varying the rotational rpm of the cricket ball, where the axis of rotation for seam and shaft is same and the pressure difference between the upper and the lower surface of the cricket ball determine by the help of static manometer. Some experimental works have also been carried out and compared with those of the results obtained numerically. The upward pressure, which creates lift, has increased almost linearly with the increase of ball position angle to approximately 15o to 30o and it also decrease with increase of ball rotational speed. Finally some conclusions have been drawn on the basis of the experimental result.
EXPLORING ALTERNATIVE ENERGY TO MEET ENERGY CRISIS OF BANGLADESH
(R&D Wing, MIST, 2009-02) M Mahbubur Rahman, Commander (L). psc, BN
The explosive growth of worldwide energy demand has made it painfully clear that our traditional sources of electricity can no longer be expanded without creating a major environmental tragedy. Coal burning during the industrial revolution created localized disasters but the massive scale today is creating disaster on a global scale. Fuel costs are growing exponentially as the limits of our planet's resources is reached. Oil and natural gas supplies are running short but coal supplies were thought to be plentiful and cheap. The problem is that every ton of coal burned produces 3.7 tons of CO2! The idea of transporting and hiding forever that much CO2 was ludicrous from the start. To make matters worse, coal prices have quadrupled since 2003. Even if we ignore CO2, coal is an environmental nightmare. Mercury emissions make it dangerous to eat many fish today and may be responsible for our epidemic of autism. It will bring an end to the denial of coal's unsolvable problems. Already new laws are being considered to ban coal outright. But what is the alternative? Solar power works mainly during midday and wind power can stop almost completely from late night through morning. Weather conditions can completely disable both wind and solar. Geothermal power uses no fuel, produces no pollution and works reliably and steadily all day and every day. To choose the best alternatives for power solution, resource, capability, economic condition, geographic location, politics demand, growth rate, environmental factors etc are very vital. These factor are the prime consideration for power modeling. Keywords
MIST Prospectus 2009
(Research and Development Wing, MIST, 2009-12)
FABRICATION OF A LOW TEMPERATURE DIFFERENTIAL STIRLING ENGINE
(DEPARTMENT OF MECHANICAL ENGINEERING, 2009-12) ALAM, MD. KHURSHED; ISLAM, MD. ARAFAT; UDDIN, MD. AHSAN
In recent years, understanding of the stirling engine has enjoyed considerable growth. Research and development on the stirling engine has steady progressed, and many new insights, inventions, and potential applications have many discovered and explored. One of the most exciting recent developments is the so called “low temperature differential” stirling engine. This new type of stirling is capable of running on very small differences in temperature between the hot and cold sides, or better to say, between the warm and cool sides. Low temperature differential stirling engine have been built that run on differentials ranging from just under 100°C (180°F) down to an incredible 1/2°C (1°F). This means that stirling engines can now utilize low grade heat sources for their operation ranging from passive solar or geothermal energy to industrial process waste heat. Weather low temperature differential stirling engines can be put to practical use is an open question and still the subject of ongoing research and development work is being carried out worldwide at universities, government laboratories, and in private sector. The objective of this project was to examine the history and development of Stirling Engines and through the process of examination, take the concepts and fundamental Characteristics of Stirling engines, and build a working model. The ultimate goal of this Project was to create a reproduction of James Senft’s N-92 Low Temperature Differential Stirling Engine and also built another N-92 model stirling engine with rescaling of its size and then analyze their performance, make some comparisons between two models and also fine out various difficulties of this fabrication technique.
Performance of Wireless DS-CDMA System with Fading
(Military Institute of Science and Technology, 2009-12) Sultana, Nigar; Rahman, Himika
This paper develops and models a DS-CDMA wireless network by simulation. It present an over view of CDMA transmission systems as compared to other multiple access schemes. The channel parameters and channel conditions are varied and the performance studied. The investigation of spreading, modulation and coding is carried out. BPSK modulation techniques are used to see the performance of the system when each is used. The BER is used as a tool to monitor the system output as SNR is varied. The AWGN channel is used in the simulation. The simulation starts with a single user and later the number of users is increased and the results evaluated. The final results are compared to the theoretically calculated results and finally concluded.
AN ANALYSIS OF ALTERNATIVE INDUSTRIALIZATION STRATEGIES FOR DEVELOPING ECONOMIES
(R&D Wing, MIST, 2009-12) Jahan, Masud; Rashid, Samiur
Industrialization is the process of social and economic change whereby a human group is transformed from a preindustrial society into an industrial one. Import Substitution Industrialization (ISI) is an industrialization policy based on the premise that a country should attempt to reduce its foreign dependency through the local production of industrialized products. Because of limitations of ISI, the concept of Export-led industrialization was supported by economists. Export-led industrialization (ELI) is an industrialization policy aiming to speed-up the industrialization process of a country through exporting goods for which the nation has a comparative advantage. Export-oriented industrialization is often contrasted with import substitution industrialization. The objective of this paper is to critically appraise the role of Easy ISI strategy in economic development.
ANALYSIS OF MODELING RESULTS FOR RIVER BANK PROTECTION OF THE MOST VULNERABLE PART OF TAZUMUDDIN UPAZILA UNDER BHOLA DISTRICT
(R&D Wing, MIST, 2009-12) Aziz, Md. Abdul; Alam, Rubayat; Mahamud, Upal; Haque Khan, Zahirul
Bhola is the largest Island of Bangladesh situated in the south central region (latitude approximately from 430000N to 525000N and longitude 555000E to 590000E) of Bangladesh in the highly dynamic Meghna Estuary. In recent years the erosion along eastern shoreline of Bhola Island has become a serious issue. Attempts are taken to establish the base line condition to simulate the natural phenomena. Baseline condition for Tazumuddin Upazilla (under Bhola district) has been developed based on hydrodynamic and morphological modelling and historical data of bank line shifting, thalweg line shifting, bathymetric data, char movement etc. To calibrate and validate the model water levels and discharge are successfully calibrated. From modeling result, erosion/deposition pattern at and outside the protective works, new vulnerable areas due to revetment have been identified. Hydrodynamic (HD) simulations during ebb tide the maximum depth integrated near bank velocity is found within the range of 1.5-3.0 m/s along the riverbank of Tazumuddin and 1.0-1.5 m/s along the riverbank of Lalmohan. Morphological simulation shows the channel is further extended towards the south-east part. Further computational simulation showed that channel in front of Tazumuddin become deeper and it is extended more towards the south-east direction. From bathymetry survey data in May, 05 it is found that there is a tendency to deepen the channel in front of Tazumuddin where protective work was suggested and the deep channel is further extended towards south-east direction like simulation result. So it can be concluded that simulation result and real condition near Tazumuddin follows the same trend of channel development.
STUDY OF SCATTERING PARAMETERS OF WAVEGUIDE DEVICES USING COMSOL MULTYPHYSICS
(Military Institute of Science and Technology, 2009-12) Ahmed, Tanjila; Islam, Samiul; Islam, Shajid
S-parameters refer to the scattering matrix. The concept was first popularized around the time that Kaneyuke Kurokawa of Bell Labs wrote his 1965 IEEE article Power Waves and the Scattering Matrix. It helped that during the 1960s, Hewlett Packard introduced the first microwave network analyzers. The scattering matrix is a mathematical construct that quantifies how RF energy propagates through a multi-port network. The S-matrix is what allows us to accurately describe the properties of incredibly complicated networks as simple "black boxes. One difficulty associated with transmission parameters is that in a practical high-frequency circuit it is extremely difficult to obtain the perfect opencircuit and short-circuit conditions required to make good measurements. The Sparameter method circumvents the open/short difficulties by always connecting both ports to transmission lines with stable, well-defined impedances. To the extent that such a test setup better represents the actual working conditions of your circuit, the S-parameter method generates a more accurate model. These are the reasons why this thesis topic is chosen. In this thesis paper, an idea about what is S-parameters, it’s classification and usefulness is described elaborately. Then here the mathematical and network based analysis is done which helps to know about S-parameters more accurately. Here Sparameters are expressed with mathematical equations. Examples are being done by the help of the software named FEMLAB. FEMLAB is a powerful, interactive environment for modeling and solving scientific and engineering problems based on partial differential equations. It has helped to know the detailed status of waves in different types of waveguides. These detailed statuses are being described at the end of this thesis.