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.
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.
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.
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.
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.