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Dhaka, Bangladesh

Choucri N.,Massachusetts Institute of Technology | Goldsmith D.,Massachusetts Institute of Technology | Mezher T.,MIST
Proceedings of the 2011 20th IEEE International Workshops on Enabling Technologies: Infrastructure for Collaborative Enterprises, WETICE 2011 | Year: 2011

Modeling technology policy is becoming an increasingly important capability to steer states and societies toward sustainability. This paper presents a simulationmodeling approach to evaluate renewable energy readiness, that is, the ability to develop renewable energy, taking into account critical ecological, economic, governance, and institutional factors that generally shape energy policy. While the dynamics underlying shifts towards renewable energy are generic, we focus on the United Arab Emirates (UAE) as a counter-intuitive case. The UAE is a major oil rich and oil exporting country, with large untapped reserves. Yet it has made a policy decision to develop sources of renewable energy. The absence of basic institutional, managerial, and infrastructure requirements creates major barriers that must be surmounted if this policy is to be effectively pursued. For these and other reasons, the UAE serves as a "hard test" for the potentials of renewable energy and can eventually be used as a model for other oil exporting countries. The UAE hasalready made strides along a trajectory in trial and error ways. As such, it helps demonstrate in theory and practice the readiness for renewable energy-that can help articulate effective policy trajectories. © 2011 IEEE.

Rahman M.M.,MIST | Islam M.M.,MIST
1st International Conference on Electrical Engineering and Information and Communication Technology, ICEEICT 2014 | Year: 2014

Capacitor and inductor are very important circuit components in almost all electrical and electronic applications. They are used as two terminal passive components in electrical circuit. Energy storage, power conditioning, power factor correction, high and low pass filter, noise suppression, starter, oscillators and for many other purposes capacitor is used. Inductors are used extensively with capacitors and resistors to create filters for analog circuits and in signal processing. Alone, an inductor functions as a low-pass filter, since the impedance of an inductor increases as the frequency of a signal increases. For many reasons there may arise a need to exchange a capacitor with an inductor. In this paper we'll discuss about the replacement of a capacitor with an inductor keeping the current and voltage same in the electrical circuit. © 2014 IEEE.

Shafin M.K.,MIST | Kabir K.L.,MIST | Ridwan I.,MIST | Anannya T.T.,MIST | And 3 more authors.
Computational Biology and Chemistry | Year: 2015

Traditional clustering algorithms often exhibit poor performance for large networks. On the contrary, greedy algorithms are found to be relatively efficient while uncovering functional modules from large biological networks. The quality of the clusters produced by these greedy techniques largely depends on the underlying heuristics employed. Different heuristics based on different attributes and properties perform differently in terms of the quality of the clusters produced. This motivates us to design new heuristics for clustering large networks. In this paper, we have proposed two new heuristics and analyzed the performance thereof after incorporating those with three different combinations in a recently celebrated greedy clustering algorithm named SPICi. We have extensively analyzed the effectiveness of these new variants. The results are found to be promising. © 2015 Elsevier Ltd. All rights reserved.

Rahman M.L.,MIST | Saha P.K.,MIST | Mir F.,MIST | Totini A.T.,MIST | And 2 more authors.
Procedia Engineering | Year: 2015

This paper presents an experimental investigation of an open loop pulsating heat pipe of 2 mm inner diameter and 2.5 mm outer diameter with fin in condenser section to study the heat transfer performance. The setup is an open loop closed end pulsating heat pipe creating a total of 8 loops with total length of 25 cm. The performance characterization will be done for methanol as working fluid with 50% filling ratio. The evaporator section is 5 cm in length and the condensation section is of 8 cm with an adiabatic section of 12 cm. The evaporator section is heated by electrical input using Ni-Chrome wire and the condenser section is cooled by fan. The effects of fin in PHP for open loop will be analyzed for heat transfer characteristics and the results are compared with that of without fin keeping constant the other parameters. The results explore the possibility of using the open loop pulsating heat pipe as an integrated structure to achieve higher thermal conductance to the host substrate. Effect of gravity, pressure differential in the system, temperature, heat input etc. may have influence in this fact due to which 45° inclined position of finned structure shows the best performance. © 2015 The Authors.

Rahman M.L.,MIST | Mir F.,MIST | Nawrin S.,MIST | Sultan R.A.,MIST | Ali M.,Bangladesh University of Engineering and Technology
Procedia Engineering | Year: 2015

The pulsating heat pipe, a serpentine tube of capillary dimension with many turns, has great impact on today's successful thermal management. It is an ascending technology to satisfy present requirement of increasing thermal performance. Focusing on this, an experiment has been done on the open loop pulsating heat pipes (OLPHP) to observe their performance characteristics by using two types of working fluid by varying inclination angles. The experiment is performed on 2.5 mm inner diameter and 3 mm outer diameter OLPHP with an insert of copper wire of 1 mm diameter and fins are added on the condensation section. This investigation is done using methanol and ethanol with 50% filling ratio in OLPHP with 8 loops. In this experiment the effects on the performance of using fins with insert with two different fluids (methanol and ethanol) and the variation of inclination angles are investigated. The results show that the performance characteristics in all the circumstances are better for setup with fin and insert than the normal setup. As higher thermal resistance indicates better performance, so we can say that setup with methanol performs better than ethanol. This performance is best at 45° inclination angle. It can be seen that, higher the inclination angle, better the performance and this performance is best at 45° inclination angle for this experiment. © 2015 The Authors.

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