Brown N.M.,University of Technology, Jamaica |
Lai F.C.,University of Oklahoma
Solar Energy | Year: 2011
Experiments were conducted to investigate the effectiveness of a porous manifold in the formation and maintenance of thermal stratification in a liquid storage tank. A thermal storage tank with a capacity of 315. L and a height-to-radius ratio of 4 was used for the experiment. The porous manifold used was made from rolling up a nylon screen into the shape of a tube. Stratification was observed at a Richardson number as low as 0.615. Flow visualization was also performed to confirm the effectiveness of the porous manifold in the promotion and maintenance of stable thermal stratification. From the results of flow visualization, one can conclude that a porous manifold is able to reduce the shear-induced mixing between fluids of different temperature, and thus is able to promote and maintain a stable stratification. © 2011 Elsevier Ltd.
Deans C.,University of Technology, Jamaica
Conference Proceedings - IEEE SOUTHEASTCON | Year: 2015
The concept of an intelligent transportation system has been accepted and deployed in many countries. At the same time, there are others that are yet to embrace this technology. Henceforth, the possibility has arisen for the feasibility of such a system to be researched in a Jamaican context. This paper's contribution presents a concept model for an intelligent transport system using the Internet of Things architectural model the paper also will show both the motivation and application of this model within the context of the Jamaican transportation environment. Additionally, the paper will seek to provide the next steps required for evaluating the scaled infrastructure deployments with an aim to create and discuss a proposed design and structured model of an intelligent urban transportation system for the Jamaican environment, based on the Internet of Things (IOT). © 2015 IEEE.
Hylton K.,University of Technology, Jamaica
Journal of Chemical Health and Safety | Year: 2016
In the United States, the OSHA regulation entitled "Occupational Exposure to Hazardous Chemicals in Laboratories" (29 CFR 1910.1450), requires the development of a "Chemical Hygiene Plan" which states how an organization will implement the requirements of the Laboratory Standard to provide a safe and healthy work environment for its employees. This implies a centralized system which takes into consideration specific needs of specialized departments. In Jamaica, there is no distinct regulation that focuses on university/academic laboratories. An assessment of a small university's current safety plan reveals that it is geared towards the management of personal safety and disaster management and thus focuses solely on the treatment of fire, earthquake, bomb threats and hurricanes despite the fact that the university offers pure and applied sciences and consequently procures, utilizes and generates toxic chemicals and biological hazards. Consequently, laboratory safety is at the discretion of the users of the laboratory and therefore one wonders, that in the absence of a centralized system, should science departments have their own safety department? © 2015 Division of Chemical Health and Safety of the American Chemical Society.
Barclay C.,University of Technology, Jamaica |
Osei-Bryson K.-M.,Virginia Commonwealth University
International Journal of Production Economics | Year: 2010
Performance criteria typically reflect the values of the project stakeholders in how they will be viewing their projects. A critical analysis of current research shows that several key challenges being faced in information systems (IS) projects include the lack of clearly defined objectives, mismatched stakeholders' expectations and lack of sufficient or formal methods to aid practitioners in developing relevant performance criteria. This is accentuated by growing calls to rethink the traditional measurement paradigm. Moreover, most of the known solutions in practice are without structured or easily implementable procedures to elicit and develop performance criteria and measures. Against this background, the paper proposes a formal method to develop a comprehensive set of performance criteria or objectives grounded in the views of the project stakeholders and associated measures aligned to these objectives. The project performance framework (PPDF) primarily relies on the principles and advantages of the value focused thinking (VFT) and goal question metric (GQM) to elicit and develop these performance criteria and associated measures based on the values of the stakeholders in the project. Three project cases are used to illustrate and assess the model. © 2009 Elsevier B.V. All rights reserved.
Bramwell L.,University of Technology, Jamaica
Journal of Exposure Science and Environmental Epidemiology | Year: 2015
Typical resuspension activities within the home, such as walking, have been estimated to contribute up to 25% of personal exposures to PM10. Chamber studies have shown that for moderate walking intensities, flooring type can impact the rate at which particles are re-entrained into the air. For this study, the impact of residential flooring type on incremental average daily (24 h) time-averaged exposure was investigated. Distributions of incremental time-averaged daily exposures to fine and coarse PM while walking within the residential micro-environment were predicted using CONTAM, the multizone airflow and contaminant transport program of the National Institute of Standards and Technology. Knowledge of when and where a person was walking was determined by randomly selecting 490 daily diaries from the EPA’s consolidated human activity database (CHAD). On the basis of the results of this study, residential flooring type can significantly impact incremental time-averaged daily exposures to coarse and fine particles (α=0.05, P<0.05, N=490, Kruskal–Wallis test) with high-density cut pile carpeting resulting in the highest exposures. From this study, resuspension from walking within the residential micro-environment contributed 6–72% of time-averaged daily exposures to PM10.Journal of Exposure Science and Environmental Epidemiology advance online publication, 13 May 2015; doi:10.1038/jes.2015.31. © 2015 Nature America, Inc.
Reid D.,University of Technology, Jamaica
Conference Proceedings - IEEE SOUTHEASTCON | Year: 2015
This paper demonstrates the use of OpenModelica, an open source, standards based software tool, to model and evaluate algorithms for the control of power inverters. The rotating frame PI control of a single-phase inverter is used as an example for the purposes of demonstrating OpenModelica's capabilities in this regard. The results show the simulation of the DQ-frame PI control algorithm regulating and stabilizing the single-phase inverter's output voltage after a step change in the inverter load during stand-alone operation. © 2015 IEEE.
Cooke K.O.,University of Calgary |
Khan T.I.,University of Calgary |
Oliver G.D.,University of Technology, Jamaica
Materials and Design | Year: 2012
Transient liquid phase diffusion bonding (TLPDB) of Al-6061 containing 15vol.% alumina particles was carried out at various bonding temperatures. A 5μm thick electrodeposited Ni-coating containing 18vol.% nano-size alumina particles was used at the interlayer. Joint formation was attributed to the solid-state diffusion of Ni into the Al-6061 alloy followed by eutectic formation and isothermal solidification at the joint interface. Examination of the joint region using scanning electron microscopy (SEM), wavelength dispersive spectroscopy (WDS) and X-ray diffraction (XRD) showed the formation of intermetallic phases such as Al3Ni, Al9FeNi and Ni3Si within the joint zone. The results indicate that the incorporation of nano-size Al2O3 dispersions into the interlayer can be used to improve joint strength. © 2011 Elsevier Ltd.
Cooke K.O.,University of Technology, Jamaica
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2012
Transient liquid phase (TLP) diffusion bonding of Al-6061 containing 15 vol pct alumina particles was carried out at 873 K (600 °C) using electrodeposited nanocomposite coatings as the interlayer. Joint formation was attributed to the solid-state diffusion of Ni into the Al-6061 alloy followed by eutectic formation and isothermal solidification of the joint region. An examination of the joint region using an electron probe microanalyzer (EPMA), transmission electron microscopy (TEM), wavelength-dispersive spectroscopy (WDS), and X-ray diffraction (XRD) showed the formation of intermetallic phases such as Al 3Ni, Al 9FeNi, and Ni 3Si within the joint zone. The result indicated that the incorporation of 50 nm Al 2O 3 dispersions into the interlayer can be used to improve the joint significantly. © The Minerals, Metals &Materials Society and ASM International 2012.
Reid D.,University of Technology, Jamaica
Conference Proceedings - IEEE SOUTHEASTCON | Year: 2016
Large ramp down rates of renewable energy sources (RES) can cause power quality issues in microgrids due to their relatively large penetration levels. Energy storage can mitigate these issues but they present a large upfront cost and require relatively frequent replacement. To reduce or eliminate these costs, microgrids can be implemented without energy storage but then ramp down power quality issues arise. This paper presents a method using a reduced amount of storage to provide ramping support to the conventional generators in a microgrid. The EMS in a hierarchical control structure provides this support by sensing RES ramp down and directing the energy storage controller to compensate immediately using the stored energy. The level of compensation is then reduced as a much lower ramp rate than the original RES ramp down rate. Simulation results show how different compensation ramp down rates affect microgrid power quality and demonstrate that a much lower ramp down rate can reduce power quality fluctuations. © 2016 IEEE.
University of Technology, Jamaica | Date: 2013-07-02
Disclosed is a method and apparatus for optical computing using magneto-optical elements as logic devices. Essential logic and computing elements have been implemented.