Abdullah Q.N.,Universiti Sains Malaysia |
Abdullah Q.N.,University of Tikrit |
Yam F.K.,Universiti Sains Malaysia |
Mohmood K.H.,University of Tikrit |
And 6 more authors.
Ceramics International | Year: 2016
Large-scale β-Ga2O3 nanostructures (nanowires-NWs, nanobelts-NBs and nanosheets-NSs) were synthesized via thermal evaporation of GaN powder in an ambient argon atmosphere. The effect of the substrate type (Si, AlN-thin film/Si and ZnO-thin film/Si) on the growth of β-Ga2O3 nanostructures was investigated. The morphology changes from NWs to NBs or NSs when the substrate changes from Si to AlN-thin film/Si or ZnO-thin film/Si, respectively. The size and dimensionality were the most influential parameters on the structure of the as-grown β-Ga2O3. The as-grown nanostructures crystallize within the monoclinic crystal structure of the β-Ga2O3 phase. The obtained nanostructures show intense blue-red emission characterized by a broadband photoluminescence spectrum with peaks located at 430, 500-525 and 688-700nm. These emissions originate from the defect-related donor-acceptor pair recombination mechanism and depend on the nanostructure dimensionality and morphology. A vapor-solid growth mechanism for the growth of various β-Ga2O3 nanostructures was also proposed. © 2016 Elsevier Ltd and Techna Group S.r.l.
Soliman A.M.,The Kingdom University |
Soliman A.M.,U.S. Department of Interior |
Soliman A.M.,Minia University
Journal of Architectural and Planning Research | Year: 2015
Master plans for urban settlements must allocate land for a variety of uses, including special land uses such as sewage treatment plants, garbage treatment areas, and cemeteries, which should be located outside the habitable settlement spaces. However, master plans often do not adequately account for these special land uses, which can result in unplanned developments that may hinder urban growth in both the short and long terms. This is clearly happening in Egypt, as evidenced in the cemetery of Ghafeer in Cairo, which became a part of the residential area over time, and in many small towns like Kharga, Beni Mazar, Minia, Assiut, and Qena. This paper presents a study examining the issue of land use for cemeteries in Egypt and their unplanned development. It explores the burial culture of Egyptians and the specifics of certain cemeteries from the perspective of urban planning. It also presents the findings of a survey carried out in the cities of Minia and Kharga that involved residents' general observations about their cemeteries and a structured questionnaire to ascertain the problems related to sprawling, unplanned cemeteries. The paper discusses the importance of planning cemeteries, which should take into account the moral, legal, and religious needs of the society. To conclude, the paper derives several principles and guidelines for cemetery site selection that could be used in the preparation of structural plans for urban settlements in Egypt. Copyright © 2015, Locke Science Publishing Company, Inc.
Ali El-Wageeh S.M.,The Kingdom University
Electronic Government | Year: 2012
This paper suggests a conceptual model for applying the Virtual Reality (VR) technology on the information sector of the e-Government. A conceptual model for applying VEs in e-Government websites is suggested. The model is empirically applied on the electronic services offered to citizens through the website of the Ministry of Municipalities and Urban Planning affairs in the Kingdom of Bahrain. It is found that engaging VEs as interactive visual gates of information in such websites can help in developing the quality and interactivity of services offered to citizens. Moreover, it can strengthen the interoperability between governmental authorities and sub-directorates. Copyright © 2012 Inderscience Enterprises Ltd.
Janahi W.,University of Bahrain |
Albareeq J.M.,The Kingdom University
Bahrain Medical Bulletin | Year: 2015
Background: Post-tonsillectomy hemorrhage is a serious complication; if not managed properly, it could be life threatening. Objective: To evaluate the incidence of post-tonsillectomy bleeding. Design: A Retrospective Study. Setting: ENT Department, King Hamad University Hospital, Bahrain. Method: Seven hundred twenty-nine patients operated for tonsillectomy from February 2012 to February 2014 were included in the study. Patients who had tonsillectomy in other hospitals were excluded from the study. Some surgeons used hot technique, others used cold technique. Some patients had been operated for adenoidectomy and turbinate reduction by laser. Data documented were age, gender, type of tonsillectomy technique used, type of hemorrhage (primary or secondary), type of management postoperatively and other postoperative complications. Result: Seven hundred twenty-nine patients were operated for tonsillectomy from February 2012 to February 2014. Twenty-eight (3.8%) patients had post-tonsillectomy bleeding, 9 (1.2%) were children and 19 (2.6%) were adults. Two (0.2%) were primary and 26 (3.6%) were secondary bleeding. Twelve (1.6%) patients underwent tonsillectomy by hot technique and 16 (2.2%) by cold technique. Twenty (2.7%) patients were managed by admission and observation. Eight (1.1%) were managed by cautery or ligation in the operation theater. The female to male ratio was 11:17. Other complications encountered were broken tooth, neck pain, nasal bleeding, and fever. Conclusion: In this study, the incidence of post-tonsillectomy bleeding was 3.8% and no mortality was recorded during the period of the study. Further multicentric study with a larger sample is recommended. © 2015, Bahrain Medical Bulletin. All Rights Reserved.
Sarac B.,Karadeniz Technical University |
Al-Madani H.,The Kingdom University |
Ayhan T.,University of Bahrain
Energy Conversion and Management | Year: 2011
Heat transfer from a heated plate placed behind an obstacle in cross-flow was investigated in this experimental study. In the experiment three types of obstacles were investigated circular; rectangular and triangular cross-sectioned, in order to test the effects of geometrical shape of the obstacle on heat transfer from the test plate for various orientation angles of the plate (β = 0°, +45°, 90° and -45°). The experiments have been conducted for three different obstacle sizes of each geometry. During the study the effects of obstacle size, and separation between the obstacle and test plate for different orientation angles were examined for range of Reynolds number 2700 < Rel < 13,000, dimensionless separation number P ranging from 1.81 to 13.82 and flow blockage ratio varied of ζ = 9.33%, ζ = 18.66%, and ζ = 28% for D = l, 2l and 3l respectively. Based on the measurements, average Nusselt number was determined using lump heat capacitance method. From the results, it was found that the shape and size of the obstacle and plate orientation angle significantly affect the heat transfer from a plate in the wake flow region. © 2011 Elsevier Ltd. All rights reserved.