130 research outputs found
Narratives and outcomes of the uprisings in Syria and Bahrain
No full textThe narratives deployed by the political elites and the opposition groups in Syria and Bahrain has undergone a process of evolution since the onset of the Arab Spring. The examination of the cases of Syria and Bahrain is useful from a methodological perspective, since it enables us to determining the nuances that come about from the manner in which the Arab Spring unfolded in the region. This dissertation attempts to unite a diverse range of elements to present a comprehensive analysis of the nature of revolutionary consciousness, the nature of Arab transnational collective action movements in an era of globalization, and the mechanisms governing the evolutions of protest rhetoric. This dissertation draws attention to the particular ways in which language and rhetoric are used on both sides of the struggle and the ways in which rhetoric changes in response to the expectation of an international audience.Ph.D.Includes bibliographical referencesby Hesham Abdulaziz A. Alamma
Heat Transfer Characteristics for Natural Convection through Inline and Staggered Horizontal Banks of Tubes
No full textAbstract: In the present study, heat transfer characteristics of natural convection of air through 7x7 horizontal bank of tubes of 1cm diameter are studied numerically using Ansys-Fluent CFD code. Both the inline and staggered arrangements are considered. The study is carried out under constant heat generation in the tubes. The study is carried out at different spaces between the tubes in both the horizontal (longitudinal) and vertical (transverse) directions. The results of thermal and flow fields are obtained for each case. The effect of the longitudinal and transverse distances, SL and ST respectively, between the tubes on heat transfer is obtained for both the cases of inline and staggered arrangements. The studied range of both SL and ST is 1.2 to 4 cm. The results show that the heat transfer rate increases and the temperature decreases as a result of increasing the distance between the tubes in both the longitudinal and transverse directions. The effect of the longitudinal distance between the tubes on heat transfer is more pronounced than the corresponding effect of the transverse distance. Staggered arrangement has better heat transfer characteristics than the inline arrangement. Two correlations relating Nusselt number with tube spacing, one for the inline arrangement and the other for the staggered, were derived from the present results. Ideal tube spacing for the studied range of SL and ST was determined for the two arrangements.
Keywords: Heat transfer, horizontal tube bank, inline and staggered.
Title: Heat Transfer Characteristics for Natural Convection through Inline and Staggered Horizontal Banks of Tubes
Author: Abdelfatah Abdelmaksoud, Hesham Elbakhshawangy
International Journal of Novel Research in Electrical and Mechanical Engineering
ISSN 2394-9678
Vol. 10, Issue 1, September 2022 - August 2023
Page No: 39-53
Novelty Journals
Website: www.noveltyjournals.com
Published Date: 18-January-2023
DOI: https://doi.org/10.5281/zenodo.7547534
Paper Download Link (Source)
https://www.noveltyjournals.com/upload/paper/Heat%20Transfer%20Characteristics-18012023-2.pdfInternational Journal of Novel Research in Electrical and Mechanical Engineering, ISSN 2394-9678, Novelty Journals, Website: www.noveltyjournals.co
One-year mortality rate after hip fracture in the western region of Saudi Arabia A retrospective cohort study
No full text
SPECIAL FOCUS: TRAUMA
One-year mortality rate after hip fracture in the western region of Saudi Arabia: A retrospective cohort study
Al-Hebshi, Amro MDa; Hegaze, Adel MDa; Mustafa, Hesham N. MDb; Tash, Bayan MBBCha; Sawan, Dana MBBCha; Al-Faris, Khalid MBBCha
Author InformationCurrent Orthopaedic Practice 31(2):p 115-119, March-April 2020. | DOI: 10.1097/BCO.0000000000000841
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Abstract
Background:
The mortality rate of elderly patients who sustain a hip fracture is high compared to the general population. Identifying risk factors can help predict patients at risk of hip fracture to reduce the mortality rate. No studies have shown the mortality rate of patients with hip fractures in the western region of Saudi Arabia. Therefore, this study aimed to identify the risk factors associated with the mortality of patients with hip fractures admitted to the King Abdulaziz Hospital and compare the results with other studies.
Methods:
The mortality rate (within 1 yr or less) in 177 patients over the age of 60 yr who were admitted to the university hospital between July, 2007, and September, 2012, with hip fractures was retrospectively studied. The patients were assessed with regard to gender, age, type of hip fracture, and type of surgical intervention.
Results:
The overall mortality rate 1 yr after hip fracture was 12.43%, and the mean age was 77.77 yr old. The risk factors most associated with mortality were as follows: advanced age (71 to 80 and 81 to 90 yr old), male, peritrochanteric (extracapsular) fracture, and operative fixation with dynamic hip screw.
Conclusions:
The mortality rate of patients with hip fractures within 1 yr has a high-risk potential, especially for male patients over 71 yr of age with peritrochanteric (extracapsular) fractures. Surgical treatment with dynamic hip screw also was shown to be a risk factor between the different treatment options.</p
Study of Outputs Power of Broadly Tunable InGaAsp/InP AMQW Lasers
No full textTitle: Study of Outputs Power of Broadly Tunable InGaAsp/InP AMQW Lasers, Author: Hesham Enshasy, Location: MillsBroadly tunable InGaAsP/InP asymmetric multiple quantum well (AMQW) ridge waveguide laser diodes suffer from low output power. The output power problem of the AMQW laser diodes limits the use of these lasers in certain applications. Both theoretical and experimental studies were carried out in this work to understand the reasons behind this output power problem and to put forth solutions to this problem. As a starting point a commercial beam propagation method (BPM) optical simulator was used to optimize the confinement factor of the laser diodes. The laser diode output power almost doubled as a result of optical confinement optimization, which opens the door for improvement from electrical and thermal optimization. A commercially available partial differential equation solver, FlexPDE, was used to solve the main electronic and thermal equations and simulate a laser diode device. The FlexPDE simulations -which were validated with published data-showed poor current injection efficiency to the center of the device active region. The FlexPDE simulations showed that the main reason for this poor current injection efficiency is the ridge structure. Since the ridge structure is an essential part of this type of laser diode, effort was put forth to reduce the effect of the ridge structure on the current injection efficiency. Both simulation and experimental data showed that extending the doping profile closer to the active area would improve significantly the output power. On the other hand, a proposed forced electrical confinement method showed potential to improve the output power of the device theoretically and experimentally. The over all output power improvement went from a range of 2-5 m W to a range of 15-18 m W as a result of this study. A discussion of the two distinct output power profiles is included in the study, while detailed explanations of the dip in the power profile supported by experimental data are reported. A new method of distance measurement using one of the first, optimized, broadly tunable InGaAsP/InP short-external-cavity diode lasers is reported. Non-linear, least squares fitting method was used to extract estimates of distance from the raw data. This fitting method together with the wide tuning range (100 nm) made it possible to achieve sub-micron resolution of distance even in the presence of noise.ThesisDoctor of Philosophy (PhD
Correction to: Naturally occurring radioactive materials (NORM) concentration and health risk assessment of aerosols dust in Nicosia, North Cyprus (Journal of Radioanalytical and Nuclear Chemistry, (2024), 333, 3, (1073-1082), 10.1007/s10967-023-09346-w)
No full textThe article “Naturally occurring radioactive materials (NORM) concentration and health risk assessment of aerosols dust in Nicosia, North Cyprus”, written by Hesham M. H. Zakaly, Akbar Abbasi, Nouf Almousa and Ahmet Savaşan, was originally published Online First without Open Access. After publication in volume 333, issue 3, page 1073–1082, the author decided to opt for Open Choice and to make the article an Open Access publication. Therefore, the copyright of the article has been changed t
RETRACTED ARTICLE: Effects of dexamethasone on foetal Doppler flow velocimetry
No full textWe, the Editor and Publisher of Journal of Obstetrics and Gynaecology, have retracted the following article: Ahmed M. Nofal, Tarek M. Sayyed, Hesham S. Mahmoud & Tamer Y. Atia (2021). Effects of dexamethasone on foetal Doppler flow velocimetry. Journal of Obstetrics and Gynaecology, 41 (3), 390–394. DOI: 10.1080/01443615.2020.1742677. Since publication, significant concerns have been raised about the statistical analysis in the article. When approached for an explanation, the authors fully cooperated and provided their data, but they have not sufficiently addressed the concerns raised, and concerns remain about the statistical methods in the article. As verifying the validity of published work is core to the integrity of the scholarly record, we are therefore retracting the article. The corresponding author listed in this publication has been informed. The authors do not agree with the retraction. We have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines. The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as ‘Retracted’
Project Risk Management during Construction Stage According to International contract (FIDIC)
No full textAbstract: Whereas the construction industry represents a significant proportion of national income in comparison with other industries, and project management during the construction stage has a very important role through which most of the project cost is spent out, therefore the project management team has to use the best techniques in project management to get the best results. Risk Management which requires more time and effort in the preliminary stage in order to avoid or mitigate risks that may occur during construction, all project stakeholders are taking responsibility for risks during the construction stage, so it is important to take care of risk management and allocation between client and contractor according to contractual terms and conditions to achieve the project. There are many types of contracts that govern the relationship between the contractual parties either locally or internationally, study proposed FIDIC contracts to govern the relationship during construction. Study proposed risk management process to Plan Risk Management, Identify Risks, Risk Allocation, Perform Qualitative Risk Analysis, Perform Quantitative Risk Analysis, Implement Risk Responses, and Monitor. Instead of Plan Risk Management, Identify Risks, Perform Qualitative Risk Analysis, Perform Quantitative Risk Analysis, Implement Risk Responses, Monitor Risks, as mentioned in PMBOK 6th edition. risk management flow chart for governance during the construction, and automate project risk management reports and interactive dashboard that demonstrate project progresses.
Keywords: construction industry, project management team, Risk Management.
Title: Project Risk Management during Construction Stage According to International contract (FIDIC)
Author: Rizk Elimam A. Younis, Hesham Abdelkhalek, Ahmed Mohammed Abdelalim
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
Vol. 10, Issue 2, October 2022 - March 2023
Page No: 76-93
Research Publish Journals
Website: www.researchpublish.com
Published Date: 13-February-2023
DOI: https://doi.org/10.5281/zenodo.7635679
Paper Download Link (Source)
https://www.researchpublish.com/papers/project-risk-management-during-construction-stage-according-to-international-contract-fidicInternational Journal of Civil and Structural Engineering Research, ISSN 2348-7607 (Online), Research Publish Journals, Website: www.researchpublish.co
Electrochemical Reduction of CO2 to CO in Membrane Electrode Assembly (MEA) Setup
No full textThe global concern of the increasing levels of CO2 is growing quickly in the recent years. Therefore, a lot of research is currently underway with respect to closing the carbon cycle. The electrochemical reduction of CO2 is a promising technology that could help utilize the CO2 as a feedstock to produce chemicals and fuels, while storing the excess energy generated from renewable energy sources in chemical bonds. Due to its simplicity and economic feasibility, the conversion of CO2 to CO has a high potential in the industrial market. Membrane Electrode Assembly (MEA) is an interesting electrochemical reactor configuration to produce CO on industrial scale due to the low ohmic losses and reduced risk of catalyst poisoning. Optimizing the catalyst and operating conditions are key steps towards the commercialization of the process. This research focuses on understanding the influence of different process parameters on the CO selectivity while analyzing the performance challenges. Multiple inlet flow rates of CO2 were tested at different current densities to evaluate its impact on the faradaic efficiency. The experiments were performed using KOH-exchange MEA cell with gas diffusion electrodes and Sustainion membrane. Since the product of interest is CO, Ag-based catalyst layer was sputtered on the gas diffusion electrode. The cathodic products were identified and quantified using gas chromatograph. The experimental results have shown that increasing current density resulted in lower CO selectivity, while the inlet flow rate did not have a significant effect. It was also shown that the cell could not achieve higher than 200mA/cm2 due to the accumulation of salts blocking the gas flow channel.On top of that, a simple 2D model was developed in COMSOL Multiphysics to understand the mass transport and concentration distribution in the gas flow channel. The model was not able to simulate the complexities of the electrochemical process and represented an ideal plug flow reactor. It is understood that the incorporation of reaction kinetics and current distribution is necessary to replicate the real scenario.Electrical Engineering | Sustainable Energy Technolog
WITHDRAWN: Clinical and hemodynamic effects of using Ivabradine in patients with heart failure due to left ventricular systolic dysfunction
No full textThis article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy
Les formes de cortesia verbal. Comparació àrab-català
No full textEl present estudi proporciona una comparació i un anàlisi de les formes de cortesia en àrab i la seva equivalència al català. En primer lloc, a la part teòrica, s'introdueixen les formes de cortesia mitjançant els estudis d'autors com H. Haverkate, Farghal i Borini o Venuti i la seva aplicació al camp de la traducció; i també es parla del llibre del qual partirem i del seu autor, Naguib Mahfuz. En segon lloc, a la part pràctica, es procedeix a fer l'anàlisi del llibre en sí mitjançant un recull de frases de cortesia i la seva equivalència a la seva versió catalana extretes del llibre original àrab i la seva traducció al català. Durant aquest apartat ens basem en les tècniques de traducció proposades per Molina. La part pràctica, no obstant, també consta d'una secció on s'analitzen altres formes de cortesia extretes de traduccions alternatives, contes i faules.El presente estudio proporciona una comparación y un análisis de las fórmulas de cortesía árabe y su equivalencia al catalán. En primer lugar, en la parte teórica se introducen las fórmulas de cortesía mediante los estudios de autores como H. Haverkate, Farghal y Borini o Venuti y su aplicación en el campo de la traducción; así como también se habla del libro a partir del cual trabajaremos y de su aturo, Naguib Mahfuz. En segundo lugar, en la parte práctica se procede a hacer el análisis del libro en sí a través de una recopilación de frases de cortesía y su traducción al catalán. Durante este apartado nos basamos en las técnicas de traducción propuestas por Molina. No obstante, la parte práctica también consta de una sección donde se analizan otras frases de cortesía extraídas de traducciones alternativas, cuentos y fábulas.The study provides a comparison and an analysis of the formulas of linguistic politeness in Arabic and their equivalence into Catalan. Firstly, in the theoretical part, through the research of authors such as H. Haverkate, Farhal and Borni or Venuti, we are introduced to formulas of politeness and their role in the translation field. Moreover, there will also be an explanation of the book which the practical part is based on and its author, Naguib Mahfuz. Secondly, in the practical part, the formulas of linguistic politeness drawn from the original Arabic book and its Catalan version are deeply analysed. This procedure is based on the translation techniques suggested by Molina.Nevertheless, the practical part is also featured by a section where other formulas of linguistic politeness drawn from alternatives translations, tales and stories are also analysed
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