Dey M.,Chittagong University of Engineering and Technology |
Dey M.,Premier University |
Matin M.A.,Chittagong University of Engineering and Technology |
Amin N.,National University of Malaysia
2016 International Conference on Innovations in Science, Engineering and Technology, ICISET 2016 | Year: 2016
The binary semiconductor compound Molybdenum telluride (MoTe2) is For high efficiency and better thermal stability, Molybdenum telluride (MoTe2) is considered as potential solar cell. AMPS (Analysis of Microelectronic and Photonic Structures) simulator is used to investigate the cell performance parameters for ultra-Thin MoTe2 PV cell. In this research work, it has been explored that the cell conversion efficiency of MoTe2 PV cell is improved with the insertion of Zinc Telluride (ZnTe) as back surface field (BSF) above the back contact metal. The highest conversion efficiency of 25.29% was found for ZnTe BSF with only 0.7 μm of absorber layer whereas it was 17.06% for no BSF with 1 μm thickness of absorber layer. The thermal stability of MoTe2 PV cell with ZnTe BSF showed better stability. © 2016 IEEE.
Iassinovskaia G.,Catholic University of Louvain |
Limbourg S.,HEC School of Management |
Riane F.,Premier University
International Journal of Production Economics | Year: 2016
Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their returnable transport items (RTIs) among the different partners of a closed-loop supply chain. In this paper, we consider a producer, located at a depot, who has to distribute his products packed in RTIs to a set of customers. Customers define a time window wherein the service can begin. The producer is also in charge of the collection of empty RTIs for reuse in the next production cycle. Each partner has a storage area composed of both empty and loaded RTI stock, as characterized by initial levels and maximum storage capacity. As deliveries and returns are performed by a homogeneous fleet of vehicles that can carry simultaneously empty and loaded RTIs, this research addresses a pickup and delivery inventory-routing problem within time windows (PDIRPTW) over a planning horizon. A mixed-integer linear program is developed and tested on small-scale instances. To handle more realistic large-scale problems, a cluster first-route second matheuristic is proposed. © 2016 Elsevier B.V.
Afilal M.E.,Premier University |
Elasri O.,Premier University |
Merzak Z.,Premier University
Journal of Materials and Environmental Science | Year: 2014
Biogas is the result of the anaerobic digestion of the organic matter. In this work, we undertook a series of experiments, to characterize and ferment the various substrates and to produce flammable biogas. Waste of internal organs of chicken meat presents a weak ratio C/N of 2,42 but the potential methanogene is most important among the waste studied with 15,68 m3/T. That is because there is a large fraction of lipids (32%) in its dry matter. Waste of the animalery from the university is characterized by ratio C/N of 8,21, higher with the presence of sawdusts, which leadsto a methanogenepotential of 11,52 m3/T in the second place. Chicken meat droppings present a ratio C/N of 3,68 which makes it possible to have a potential methanogenes of 11,24 m3/T. The fish scrap is characterized by the weakest ratio C/N of 1,23 leading to the production of the lowest potential methanogene 6,64 m3/T, this result is related to the presence of a large proteinic fraction (70%). This work allowed us to conclude that between 32°C and 45°C the biogas production is correctly conducted. The chemical compositions of the wastes studied bring the necessary nutrients; mainly (Zinc, Cuivre, Calcium, Nickel and Potassium) to the anaerobic bacteriadevelopment. At the end of the anaerobicdigestion, the digestat obtained keep all mineral fertilizers which makes it possible to use as an agriculturaloutput. This work opens new horizons towardan alternative of the development in the Moroccans rural area, and at the same time proposes a renewable energy allowing a better management of organic waste, the production of flammable gas and also a fertilizing mud for the amendment of the grounds. In order to complete this work, other experiments are put in prospect. They will be devoted to the design and construction of an operational fermentor adapted to the Moroccan conditions.
Iqbal S.Md.A.,Premier University |
Kabir Md.H.,Bangladesh University of Engineering and Technology
14th International Conference on Computer and Information Technology, ICCIT 2011 | Year: 2011
Internet gateways are used to access the Internet services from the Mobile Ad Hoc Network (MANET). Internet gateways need to be discovered and selected in an appropriate way to deliver more packets to the Internet and reduce end-to-end delay. Existing gateway discovery schemes do not scale well with the number of nodes, traffic load, and speed of the nodes in MANET. To make it scalable, we proposed a new gateway discovery and selection scheme. In our scheme, the gateways advertise gateway advertisement messages only on-demand. Moreover, it contains the advertisements within a limit in order to make our scheme scalable. We considered the interface queue length and the total number of neighbors along a route in addition to the hop count to bypass the loaded and dense route to the gateways in order to reduce the delay and packet loss. Simulation results show that our scheme scales well compared to that of other schemes. © 2011 IEEE.
Asif Iqbal S.Md.,Premier University |
Humayun Kabir Md.,Bangladesh University of Engineering and Technology
ICECE 2010 - 6th International Conference on Electrical and Computer Engineering | Year: 2010
Integrating nodes in a MANET to the Internet require either a connection to the Internet or they can connect to the Internet through the Internet gateways or servers. For the second case a node in a MANET has to find out the gateway or server to connect to the fixed nodes in the Internet and it can do so either by broadcasting a gateway discovery request message or it may depend on periodic gateway advertisement messages from the gateways. End to end packet delay and throughput are strongly dependent on the time needed to discover the gateways. Hosts in a MANET use number of hops as metric to select a path to a gateway, if all the nodes select its nearest gateway to access the Internet then there may be situations when the network performance degrades because some nodes along the path have too many packets waiting in the queue. This paper presents a novel solution for connecting nodes in ad hoc network to the Internet. Here the gateway replies with an advertisement message which is broadcasted to the whole network in stead of sending a unicast reply to the requestor. We also take into account the traffic load along a path in addition with minimum hop count to select an efficient gateway. The AODV routing protocol has been used for routing in the MANET domain. We investigated our new strategy of gateway discovery and impact of new metric on the gateway selection in NS-2. Simulation results show that our one has better performance having lower delay and fewer packets drop. ©2010 IEEE.
Iqbal S.M.A.,Premier University |
Chowdhury A.K.,Premier University
Proceeding of the 15th International Conference on Computer and Information Technology, ICCIT 2012 | Year: 2012
Delivering messages in Delay Tolerant Networks is a nontrivial challenge due to its sparse nature and intermittent connectivity. Therefore efficient routing of messages is vital for these networks. In this work, we aim to adapt the spray phase of the Binary Spray and Wait routing scheme in Delay Tolerant Networks to avoid large communication overhead suffered by the scheme. We define an adaptive spraying scheme to allow nodes to switch to the wait phase without lingering the spray phase unnecessarily. Binary Spray and Wait routing permits nodes to enter the wait phase when the remaining number of copies of a message reaches one. However, we permit nodes to consider the time to live value of a message instead of the number of copies to enter the wait phase. We formulate an equation to obtain a switch value to compare against the time to live value of a message to migrate to the wait phase. Furthermore, we compare our scheme with that of other schemes through simulations. Simulation results show that our proposed adaptive spraying scheme performs better than that of others in different network scenarios. © 2012 IEEE.
Iqbal S.M.A.,Premier University
Proceeding of the 15th International Conference on Computer and Information Technology, ICCIT 2012 | Year: 2012
Delivering message in Delay Tolerant Networks is challenging due to its sparse nature and intermittent connectivity. Therefore efficient routing is very important for these networks. Here, we focus on the Spray and Wait routing schemes for Delay Tolerant Networks to avoid identical spraying technique and blind forwarding by mobile nodes. To avoid those problems, we first define an adaptive spraying scheme based on the delivery predictability of nodes. We then formulate an equation based on the number of remaining copies of messages to select a specific spraying technique each time. Thus, we propose to employ multiple spraying techniques during the spray phase of our scheme. Simulation results show that our Multischeme Spray and Wait routing performs better in different network scenarios. © 2012 IEEE.
Loaney D.,Premier University
Conference Proceedings from the International Symposium for Testing and Failure Analysis | Year: 2012
Counterfeiting of electronic components continues to be an evolving issue that greatly impacts many companies around the globe. And with so many initiatives that have either been enacted or are in the works, there is a significant amount of confusion and even fear in our industry. The financial impact and potential loss of life related to counterfeit components has become so great that an enormous amount of attention is now being devoted to identifying and mitigating this risk by both private industry and governments agencies around the world. Many companies are reaching out to test labs for both the testing of their components and direction on how to address some of these issues. This paper addresses a few of the questions that our lab is getting from some of our customers regarding counterfeit IC's and how we have answered those questions. The goal is to provide some additional insight to allow others to address this issue proactively and without fear. Copyright © 2012 ASM International® All rights reserved.
Benhaddou H.,Premier University
Medecine et Chirurgie du Pied | Year: 2013
Hallux varus is a forefoot deformity consisting of medical deviation of the first metatarsophalangeal joint. The congenital form is rare and occurs in some malformative or syndromic conditions. According to its origin, the management is different. We report a case of a 9-year-old boy with congenital hallux varus neglected since childhood. The surgical procedure is described. An aesthetically acceptable, painfree and functionally adequate foot was achieved. We present here the literature data. © 2013 Springer-Verlag France.
Chekroun K.B.,Premier University |
Baghour M.,Premier University
Journal of Materials and Environmental Science | Year: 2013
The accumulation of organic pollutants (pesticides, PCBs, DDT...) and heavy metals (Cd, Pb, Se, As...) in the aquatic systems can cause serious problems on environment and organisms affecting negatively the stability of many aquatic ecosystems and can also cause difficulties for animals and human health. The accumulation of these pollutants is due to intensive anthropogenic activity. These problems of pollution can be partially solved by the application of phytoremediation technologies using algae or aquatic plants to remove pollutants from the environment. In this review, we will present different techniques used in bioremediation and the ability of some micro and macroalgae species to absorb the organic and inorganic pollutants. Some algae are characterized by fast growth rate which is an advantage for phytoremediation, but there are also some factors which may limit the efficacy of phytoremediation of contaminated sites that will also be reviewed.