Conference Paper

Permanent URI for this collectionhttps://hdl.handle.net/10361/6935

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Humidity sensor using surface adsorbed channel modulated Graphene nanoribbon: NEGF approach
(© 2014 Institute of Electrical and Electronics Engineers Inc., 2015-01) Shakil, Shifur Rahman; Zohra, Fatema Tuz; Pramanik, Parna; Tushar, Raihanul Islam; Department of Computer Science and Engineering
Electronic transport properties of Graphene nanoribbon (GNR) are explored by self-consistent numerical simulation. The effects of vapour (H2O) adsorption in GNR sheets on its current-voltage (I-V) characteristics, conductivity, electrostatic difference potential and device density of states were studied with necessary physical insight. We found that conductivity of GNR sheet increases in some particular energy range with the increase in number of H2O molecules adsorbed. Then we encounter the effects of metal-GNR contact to investigate the practical performance of GNR as a medium of humidity sensing. Later we propose a simple schematic model for GNR Humidity Sensor (GNRHS) to investigate its performance in applied regime.
Propasal of possible OTEC sites in Bangladesh
(© 2014 IEEE Computer Society, 2013) Shakil, Shifur Rahman; Hossain, Md. Safwat; Rouf, Nirjhor Tahmidur; Department of Computer Science and Engineering
Bangladesh, a new name among the fast developing country, has a huge population of more than 160 Million people and a large demand for electricity. Although Bangladesh is still struggling to provide a stable energy source to the growing industrial sectors and general mass, the geographical location of this country is very advantageous for the development of renewable energy. The site of Bangladesh is naturally gifted area to establish alternate energy collection sources like Ocean Thermal Energy Conversion (OTEC). Since Bangladesh lies just beneath the tropic of cancer and on the shore of the Bay of Bengal, the two vital elements: constant sunlight and large littoral areas needed for OTEC can easily be found in this region. With huge water bodies throughout, this zone is very much suitable for developing multiple OTEC plant size.
Proposal for introduction of ocean thermal energy conversion (OTEC) to the energy sector of Bangladesh
(© 2013 IEEE Computer Society, 2013) Shakil, Shifur Rahman; Hoque, Md. Anamul; Department of Computer Science and Engineering
Bangladesh is among the worst victims of the global energy crisis, but it is also in one of the most advantageous positions to make transition towards the renewable energy path. In order to solve the power crisis problem by introducing innovative renewable technologies, this paper proposes and analyses the factors behind OTEC technology establishment in Bangladesh. The main objective of this paper is to propose and present the need to set up this new cleaner and efficient source of renewable energy by analyzing its suitability on geographical position. The site of Bangladesh is naturally gifted area to establish Ocean Thermal Energy Conversion (OTEC) as Bangladesh lies just beneath the tropic of cancer and on the shore of the Bay of Bengal, the two vital elements: constant sunlight and large littoral areas needed for OTEC can easily be found in this region.
Exploring modular architecture for nano satellite and opportunity for developing countries
(© 2015 Institute of Physics Publishing, 2015) Rhaman, Md. Khalilur; Monowar, M. I.; Shakil, Shifur Rahman; Kafi, A. H.; Antara, R. S I; Department of Computer Science and Engineering
SPACE Technology has the potential to provide information, infrastructure and inspiration that meets national needs in developing countries like Bangladesh. Many countries recognize this; in response they are investing in new national satellite programs to harness satellite services. Technology related to space is one example of a tool that can contribute to development both by addressing societal challenges and by advancing a nation's technological capability. To cope up with the advanced world in space technology Bangladesh seems to be highly potential country for satellite, Robotics, embedded systems and renewable energy research. BRAC University, Bangladesh is planning to launch a nano satellite with the collaboration of KIT, Japan. The proposed nano satellite project mission is to experiment about social, commercial and agricultural survey needs in Bangladesh. Each of the proposed applications of the project will improve the lives of millions of people of Bangladesh and it will be a pathfinder mission for the people of this country. Another intention of this project is to create a cheap satellite based remote sensing for developing countries as the idea of large space systems is very costly for us therefore we have decided to make a Nano-satellite.
An autonomous industrial robot for loading and unloading goods
(© 2015 Institute of Electrical and Electronics Engineers Inc., 2015) Kadir, Md. Abdul; Chowdhury, Md. Belayet; Rashid, Jaber AL; Shakil, Shifur Rahman; Rhaman, Md. Khalilur; Department of Computer Science and Engineering
In industries loading and unloading of heavy loads manually is one of the most important task which turns out to be quite difficult, time-consuming and risky for humans. This paper illustrates the mechanical design of the industry based automated robot which include: Ackerman Steering Mechanism and Differential Mechanism. Ackerman Steering allows front two wheels to turn left and right in the track without going out of the track. Differential has been mounted with two back wheels and a DC motor has been used with its controller to start motion of the robot. The autonomous robot is designed to start its movement from a starting position where goods are loaded on it, then follow a path of white line drawn on black surface and unload goods by itself after reaching a destination place. Digital Line Following sensor has been mounted in front of the robot so that the sensor can detect path by emitting and receiving signals allowing it to move in the pre-defined track having left and right turns while carrying goods from starting position to the destination. The main objective is to load and unload heavy goods that has been achieved by two large linear actuators for producing required torque and force necessary to unload heavy loads up to 150kg sideways to the ground safely. Besides, the robot has been built up having the ability to avoid collision with any obstacles that come in its way. Building an industrial robot with moderate speed, good efficiency for loading and unloading purpose within a short time to ease human suffering has been the main focus of this paper.
An automated fire fighting system
(© 2015 IEEE, 2016) Shams, Rafat; Hossain, Shafkat; Priyom, Shaoni; Fatema, Nusrat; Shakil, Shifur Rahman; Rhaman, Md. Khalilur; Department of Computer Science and Engineering
This paper presents the implemented procedure and result of a new ceiling mount firefighting system which uses computer vision theory to detect fire in an indoor environment and subdue it in root level. A domestic home or office can be brought under constant surveillance with the aid of various nodes at different strategic positions. An Alarm can be deployed for ensuring the safety issue. The number of fire accidents which take alarming number of lives of garments workers in Bangladesh can be reduced by implementing this proposed system.
Transition in electronic transport properties of graphene nanoribbon due to the adsorption of atoms and molecules
(© 2015 Institute of Electrical and Electronics Engineers Inc., 2015) Shakil, Shifur Rahman; Saha, Atanu Kumar; Bhuian, Md. Belal Hossain; Department of Electrical and Electronic Engineering
The adsorption effects of gas molecules on semiconducting armchair graphene nanoribbon (A-GNR) are studied considering on the significant changes over current-voltage characteristics, device density of states and electrostatic difference potential. The orientation of gas molecules and adsorption sites play an important role on charge transfer between the graphene surface and the molecules. The charge transfer mechanism is discussed in the light of molecular orbital theory. We have used three gas molecules-CO2, NH3 and NO as adsorbates and chose such orientation that adsorbates can act only as donor. Finally, we have made a conclusion that semiconducting A-GNR shows metallic behaviour after adsorbing optimum number of adsorbates corresponding to the area of A-GNR. Such semiconducting to metal transition can be used as sensing parameters.
Vapor adsorption limitation of graphene nanoribbons in quasi conductance increment: a NEGF approach
(© 2015 Institute of Electrical and Electronics Engineers Inc., 2015) Shakil, Shifur Rahman; Zohra, Fatema Tuz; Pramanik, Parna; Tushar, Raihanul Islam; Saha, Atanu Kumar; Bhuian, Md Belal Hossain; Department of Electrical and Electronic Engineering
The adsorption of H2O molecules on Armchair Graphene Nanoribbons (A-GNR) was theoretically studied using Non Equilibrium Green Function (NEGF) formalism to determine Device Density of States (DDOS), Electrostatic Effective Potential (EDP), Conductivity (G) and Current-Voltage (I-V) characteristics. This paper analyzed the performance of semiconducting graphene nanoribbon (N=10), metallic graphene nanoribbon (N=11) and cascade hetero-graphene nanoribbon to consider the effect of H2O adsorption on GNR and conclude that for low voltage application semiconducting A-GNR will be a better choice over metallic A-GNR and cascade A-GNR. The optimum area for adsorbing maximum number of H2O molecules on A-GNR has been studied. It has been observed that the increment of quasi conductance resulting sensing performance for limited number of H2O adsorption. To overcome this problem, a new device model has been proposed.
Donor/acceptor and adsorbate effects over transport properties of Graphene Armchair Nanoribbon/MoS2 device
(© 2016 Institute of Electrical and Electronics Engineers Inc., 2015) Shakil, Shifur Rahman; Ahmed, Sheikh Ziauddin; Department of Electrical and Electronic Engineering
Sensing properties and quasi conductivity of Graphene Armchair Nanoribbon/MoS2 heterostructure devices are investigated using Non Equilibrium Green's Function (NEGF) formalism. Both metallic and semiconducting Armchair Graphene Nanoribbon (A-GNR) are used as sensing medium, while two dimensional (2D) molybdenum disulfide (MoS2) is used as contacts. A comparative study about sensing performance of NH3 adsorbed pristine-, defect-, doped GNR and unadsorbed GNR has been carried out. The non-linear spin dependent transport properties of such devices have been studied on the basis of doping with an atom of group III & V elements. The effects of applied gate voltage over sensing properties have been observed extensively. Also in this literature, the effects of metal contacts are discussed and a new device model has been proposed to increase sensing properties.

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