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Abu Dhabi, United Arab Emirates

Spitler C.,University of Florida | Repetto J.,University of Florida | Cavanaugh C.,Abu Dhabi Mens College
American Journal of Distance Education

For students with disabilities who are at risk of leaving high school without graduating, virtual schools have become a popular alternative to traditional schools. One promising approach to increasing graduation rates is to design learning environments that serve students with disabilities through the 5 Cs framework designed to increase school completion: Connect, Climate, Control, Curriculum, and Caring Community. A utilization-focused evaluation guided our investigation to determine the presence of and application of the 5 Cs in a special education program in a public cyber charter school. Specific examples are provided, and recommendations for practice and future research are discussed. © 2013 Copyright Taylor & Francis Group, LLC. Source

Kennedy K.,International Association for K 12 Online Learning | Cavanaugh C.,Abu Dhabi Mens College | Dawson K.,University of Florida
American Journal of Distance Education

Situated in the theoretical perspective of phenomenology, the purpose of this study was to understand the experiences of three preservice teachers who voluntarily participated in a field placement in a virtual school in the southeastern United States. The preservice teachers were paired with online teachers for four weeks. Their experiences were documented via four phenomenological interviews. Using phenomenological analysis, the interview data were analyzed, resulting in the essence of the virtual school field placement. The essence of the virtual school field placement was made up of six shared horizons, consisting of (1) communication with supervising teacher, (2) information systems at the virtual school, (3) modification of course content, (4) exposure to new technologies, (5) balancing act, and (6) unmet expectations. The results have implications for preservice teachers, teacher education programs, virtual schools, education policymakers, and teacher certification organizations. Suggestions for future research are provided. © 2013 Copyright Taylor & Francis Group, LLC. Source

Bayoumi E.H.E.,Abu Dhabi Mens College | Salmeen Z.A.,Abu Dhabi Company for Onshore Oil Operations
International Journal of Power Electronics

Instant messaging among mobile phone allows rapid transmission of short messages that permit any person to share ideas, opinions and other appropriate information. In this paper, the proposed control system is based on the 3G technology, which allows sending a text message with the control command from a remote area to the desired location. The mathematical model and the design PID speed controller for the brushless DC motor drive system are presented. A Hybrid Bacterial Foraging Particle Swarm Optimisation (HBF-PSO) algorithm is employed in order to obtain the controller parameters assuring enhanced step response performance criterion. Simulation results of the designed controllers are compared with that of classical evolutionary algorithm controllers whose parameters are adjusted using Practical Swarm Optimisation (PSO) and Bacterial Foraging Optimisation (BFO). Experimental and simulations results signify the superiority of the proposed technique over the PSO and BFO methods and allow the proposed system a greater degree of freedom to control and monitor the electric drive system. Copyright © 2014 Inderscience Enterprises Ltd. Source

Bataineh M.,Helmholtz Center for Environmental Research | Bataineh M.,Abu Dhabi Mens College | Lubcke-von Varel U.,Helmholtz Center for Environmental Research | Hayen H.,Leibniz Institute for Analytical Sciences | Brack W.,Helmholtz Center for Environmental Research
Journal of the American Society for Mass Spectrometry

Identification of unknown compounds remains one of the biggest challenges for the assignment of adverse effects of sediment contamination and other complex environmental mixtures to responsible toxicants by effect-directed analysis (EDA). The identification depends on information gained from biotesting, chromatographic separation, and mass spectrometric detection. Thus, a methodology is provided for non-target identification of partial polar mutagenic polyaromatic compounds in sediment extracts by using polymeric reversed-phase HPLC column, high-resolution mass spectrometry and PubChem database. After visualization and processing the chromatogram constituents by using deconvolution software, the unambiguous elemental compositions generated were used as input in PubChem database to find a possible identity for the suspected species. The retrieved structures from the database search were refined by characterized chromatographic and mass spectrometric classifiers based on 55 model compounds comprising eight different classes representing mutagenic substructures. The applicability of the method was demonstrated by positive and tentative identification of constituents of mutagenic sediment fractions similar to selected model compounds. © 2010 American Society for Mass Spectrometry. Source

Gallampois C.M.J.,Umea University | Gallampois C.M.J.,Helmholtz Center for Environmental Research | Schymanski E.L.,Eawag - Swiss Federal Institute of Aquatic Science and Technology | Bataineh M.,Abu Dhabi Mens College | And 4 more authors.
Analytical and Bioanalytical Chemistry

Many environmental mutagens, including polyaromatic compounds are present in surface waters, often in complex mixtures and at low concentrations. The present study provides and applies a novel, integrated approach to isolate polyaromatic mutagens in river water using a sample from the River Elbe. The sample was taken downstream of industrial discharges using blue rayon (BR) as a passive sampler that selectively adsorbs polyaromatic compounds and was subjected to effect-directed fractionation in order to characterise the compounds causing the detected effect(s). The procedure relies on three complementary fractionation steps, the Ames fluctuation assay with strains TA98, YG1024 and YG1041 with and without S9 activation and analytical screening. Several mutagenic fractions were isolated by combining mutagenicity testing with fractionation. The enhanced mutagenicity in the nitroreductase and/or O-acetyltransferase overexpressing strains YG1024 and YG1041 strains suggested amino- and/or nitro-compounds causing mutagenicity in several fractions. Analytical screening of mutagenic fractions with LC-HRMS/MS provided a list of molecular formulas typically containing one to ten nitrogen and at least two oxygen atoms supporting the presence of amino and nitro-compounds in the mutagenic fractions. [Figure not available: see fulltext.] © 2013 Springer-Verlag Berlin Heidelberg. Source

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