College of the North Atlantic, Qatar

Doha, Qatar

College of the North Atlantic, Qatar

Doha, Qatar
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Kurdi J.,College of the North Atlantic, Qatar | Al-Muhtaseb S.,Qatar University | Madadkhahsalmassi B.,University of Auckland | Farid M.,University of Auckland
International Journal of Energy Research | Year: 2017

Screening alternatives for producing paraffinic phase change materials (PCMs) from natural gas-based products was investigated. Based on the quality and cost of these PCMs, two sources were identified: (i) hydrogenated gas-to-liquid (GTL) products such as heavy detergent feedstocks; and (ii) linear alpha olefins. Fractionation of a typical hydrogenated GTL mixture, containing C14 - C18 alkene and alkane hydrocarbons, has been experimentally conducted to produce five paraffinic PCMs with melting points between 3 and 28 °C. ChemCAD simulation has been proved to be a valid tool for predicting the behaviour of the GTL fractionation, including optimum experimental conditions and compositions of products. Also, hydrogenation of technical 1-octadecene was experimentally carried out in order to evaluate the quality of PCM produced from one of the available technical alpha-olefins. All PCMs produced in this work were analysed by gas chromatography equipped with flame ionization detector to determine their compositions and by differential scanning calorimetry to determine their latent heats. The results showed that the PCM with a melting temperature in the range 22 to 25 °C can be technically produced through hydrogenation of commercial 1-octadecene showing a higher latent heat compared to the PCM produced from fractionation of hydrogenated GTL mixture. © 2017 John Wiley & Sons, Ltd.

PubMed | University of Michigan, Qatar Environment and Energy Research Institute and College of the North Atlantic, Qatar
Type: | Journal: Environmental research | Year: 2016

This review contends that healthy water in terms of electrolyte balance is as important as pure water in promoting public health. It considers the growing use of desalination (demineralization) technologies in drinking water treatment which often results in tap water with very low concentrations of sodium, potassium, magnesium and calcium. Ingestion of such water can lead to electrolyte abnormalities marked by hyponatremia, hypokalemia, hypomagnesemia and hypocalcemia which are among the most common and recognizable features in cancer patients. The causal relationships between exposure to demineralized water and malignancies are poorly understood. This review highlights some of the epidemiological and in vivo evidence that link dysregulated electrolyte metabolism with carcinogenesis and the development of cancer hallmarks. It discusses how ingestion of demineralized water can have a procarcinogenic effect through mediating some of the critical pathways and processes in the cancer microenvironment such as angiogenesis, genomic instability, resistance to programmed cell death, sustained proliferative signaling, cell immortalization and tumorigenic inflammation. Evidence that hypoosmotic stress-response processes can upregulate a number of potential oncogenes is well supported by a number studies. In view of the rising production and consumption of demineralized water in most parts of the world, there is a strong need for further research on the biological importance and protean roles of electrolyte abnormalities in promoting, antagonizing or otherwise enabling the development of cancer. The countries of the Gulf Cooperative Council (GCC) where most people consume desalinated water would be a logical place to start this research.

Al-Kindi G.,Sohar University | Zughaer H.,College of the North Atlantic, Qatar
Materials and Manufacturing Processes | Year: 2012

CNC machines are still suffering from machine blindness. They cannot automatically assess the performance of applied machined tasks. In this article, an approach is made to improve the performance of CNC machining by utilizing on-line vision-based monitoring and control system. To facilitate the integration of computer vision with CNC machines a system is proposed and developed to tackle a number of pinpointed issues that obstruct such integration. A practical executable methodology of these steps is developed to enable their beneficial implementation on lab-scale CNC milling machines. Two different models of bench type CNC machines are employed to generalize the findings. Two cameras are mounted on the machine spindle of each of the two employed CNC machines to provide valid image data according to the cutting direction. Proper selection and activation of relative camera is achieved automatically by the developed system which analyze the most recent conducted tool path movement to decide on which camera is to be activated. In order to assess the machining surface quality and cutting tool status, image data are processed to evaluate resulting tool imprints on the machined surface. An indicating parameter to assess resulting tool imprints is proposed and used. The overall results show the validity of the approach and encourage further development to realize real industrial scale intelligent vision-controlled CNC machines. © 2012 Copyright Taylor and Francis Group, LLC.

Das S.K.,P.O. Box LLC | Green J.A.S.,P.O. Box LLC | Kaufman J.G.,P.O. Box LLC | Emadi D.,Qatar University | Mahfoud M.,College of the North Atlantic, Qatar
JOM | Year: 2010

The aluminum industry is a leading proponent of global sustainability and strongly advocates the use of recycled metal. As the North American primary aluminum industry continues to move offshore to other geographic areas such as Iceland and the Middle East, where energy is more readily available at lower cost, the importance of the secondary (i.e., recycled metal) market in the U.S. will continue to increase. The purpose of this paper is to take an integrated, industry-wide look at the recovery of material from demolished buildings, shredded automobiles, and aging aircraft, as well as from traditional cans and other rigid containers. Attempts will be made to assess how the different alloys used in these separate markets can be recycled in the most energy-efficient manner. © 2010 TMS.

Mahfoud M.,College of the North Atlantic, Qatar | Emadi D.,CANMET Energy
Advanced Materials Research | Year: 2010

Aluminum has experienced significant growth in several sectors over the last decade as a result of its properties and performance attributes. Aluminum is being recognized by different sectors such as automotive, construction, aerospace, etc. as a one of the best candidate material for various applications. Increasing demand for aluminum-based products and further globalization of the aluminum industry have contributed significantly to the higher consumption of aluminum scrap for re-production of aluminum alloys. In automotive applications, for example, the opportunities for continued growth in powertrain and suspension applications plus lightweighting of body structures offer the potential for considerable further growth. Today, a large amount of the aluminum going into new products is coming from recycled products. This represents a growing "energy bank" of aluminum that will become available for recycling at the end of vehicles' lives, and thus recycling is becoming a major issue, and it is essential to tackle this problem before it is too late. The future growth offers opportunity for new recycling technologies and practices to maximize scrap quality, improve efficiency and reduce cost. The present paper highlights some of the current development work in recycling, the challenges facing the implementation of recycling technologies and the future prospective of the idea. © (2010) Trans Tech Publications.

Mahfoud M.,College of the North Atlantic, Qatar | Rao A.K.P.,College of the North Atlantic, Qatar | Emadi D.,Qatar University
Journal of Thermal Analysis and Calorimetry | Year: 2010

Recycling of aluminum scrap has gained interest owing to its economic and ecological benefits. Unfortunately, during the collection of scrap from a mixer of junk from various sectors it is difficult to ensure that the recycled alloy has the same chemical composition as that of already existing commercial alloys. Consequently, some of the alloying elements become trace/tramp elements in the recycled alloy. Therefore, in order to obtain high performance recycled alloys, controlling the impurity levels of the aluminum melt is of vital importance. Normally, computer aided cooling curve analysis (CA-CCA) is used to find the relationship between cooling curve parameters, melt treatments, alloy composition, and properties. In the present study, the first differential thermal analysis (DTA) approach has been used to detect and quantify impurity elements in scrap-like liquid aluminum alloys. © Akadémiai Kiadó, Budapest, Hungary 2010.

Emadi D.,Qatar University | Rao A.K.P.,College of the North Atlantic, Qatar | Mahfoud M.,College of the North Atlantic, Qatar
Materials Science and Engineering A | Year: 2010

Recycling of aluminum scrap alloys by melting is gaining its importance in foundry sector. During recycling, some of the alloying elements present in scrap alloys eventually become trace/tramp impurities in the recycled alloy. These elements could potentially affect the alloy's microstructure and hence its mechanical properties. In the present work, an attempt has been made to investigate the effect of one of such trace elements on the microstructure and mechanical properties of A319 alloy. The element chosen for the present investigation is scandium (Sc). This paper discusses the effects of the additions of trace amount of Sc on the microstructure and mechanical properties of A319 alloy in as-cast, T6 and T7 heat treated conditions. © 2010 Elsevier B.V.

MacRae B.,College of the North Atlantic, Qatar
Canadian Journal of Respiratory Therapy | Year: 2010

CNA-Q Faculty of Respiratory Therapy has joined with the Division of Perinatology, Women's Hospital, Hamad Medical Corporation, Qatar, in developing and providing a professional development program for existing Respiratory Therapy Staff as well as considering post graduate training of Respiratory Therapy graduates.

Power R.,College of the North Atlantic, Qatar
CEUR Workshop Proceedings | Year: 2012

Qatar presents a unique opportunity to explore potential mLearning applications in a theoretical context. The geographically small country in the Arabian Gulf has nearly ubiquitous mobile and wireless network coverage. The penetration of devices such as smartphones is also incredibly high, including amongst students. And those students have expressed an overwhelming desire to integrate their mobile devices into their learning. With its virtual absence of infrastructural barriers, Qatar offers the potential to focus research on how mobile technologies can fulfill the promise of increasing student engagement by creating novel situated learning experiences. QR Cache was developed to provide an exemplar of mobile reusable learning objects (RLOs). In the pilot phase, RLOs accessed by scanning Quick Response (QR) codes were developed to teach English computer terminology. Feedback was solicited from participating students and instructors to demonstrate the desirability of using such RLOs in combination with learners' own mobile devices. The study also draws upon Transactional Distance Theory (TDT) (Moore, 1989, 1991) and Koole's (2009) FRAME model to provide theoretical grounding for both RLO and instructional design decisions. Early results show increased engagement, and reduced transactional distance. They also indicate that the RLOs show a strong convergence of the activity types delineated by the FRAME model.

Prasada Rao A.K.,College of the North Atlantic, Qatar
Transactions of the Indian Institute of Metals | Year: 2011

The work presented in this article is focused on the effect of vanadium content on the microstructure of the A319 alloy, both in as-cast and heat treated conditions. It has been found that, vanadium has significant influence on refinement of constituent phases in the above alloy. In particular, heat treated alloys exhibit much better distribution and modification of eutectic silicon than in as-cast alloys for a given addition level of vanadium. © 2011 Indian Institute of Metals.

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