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Search Results: 1 - 10 of 686213 matches for " A. S. Al-Bareda "
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Numerical Solution of MHD Flow of Micropolar Fluid with Heat and Mass Transfer towards a Stagnation Point on a Vertical Plate  [PDF]
N. T. El-Dabe, A. Y. Ghaly, R. R. Rizkallah, K. M. Ewis, A. S. Al-Bareda
American Journal of Computational Mathematics (AJCM) , 2015, DOI: 10.4236/ajcm.2015.52013
Abstract: The paper investigates the numerical solution of problem of magnetohydrodynamic (MHD) micropolar fluid flow with heat and mass transfer towards a stagnation point on a vertical plate. In this study, we consider both strong concentrations (n = 0) and weak concentrations (n = 1/2). The governing equations have been transformed into nonlinear ordinary differential equations by applying the similarity transformation and have been solved numerically by using the finite difference method (FDM) and analytically by using (DTM). The effects of various governing parameters, namely, material parameter, radiation parameter, magnetic parameter, Prandtl number, Schmidt number, chemical reaction parameter and Soret number on the velocity, microrotation, temperature and concentration have been computed and discussed in detail through some figures and tables. In order to verify the accuracy of the present results, we have compared these results with the analytical solutions by using the differential transform method (DTM) and the multi-step differential transform method (MDTM). It is observed that this approximate numerical solution is in good agreement with the analytical solution.
Numerical Solution of MHD Boundary Layer Flow of Non-Newtonian Casson Fluid on a Moving Wedge with Heat and Mass Transfer and Induced Magnetic Field  [PDF]
Nabil T. El-Dabe, Ahmed Y. Ghaly, Raafat R. Rizkallah, Karem M. Ewis, Ameen S. Al-Bareda
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.36078
Abstract: The paper investigates the numerical solution of the magnetohydrodynamics (MHD) boundary layer flow of non-Newtonian Casson fluid on a moving wedge with heat and mass transfer. The effects of thermal diffusion and diffusion thermo with induced magnetic field are taken in consideration. The governing partial differential equations are transformed into nonlinear ordinary differential equations by applying the similarity transformation and solved numerically by using finite difference method (FDM). The effects of various governing parameters, on the velocity, temperature and concentration are displayed through graphs and discussed numerically. In order to verify the accuracy of the present results, we have compared these results with the analytical solutions by using the differential transform method (DTM). It is observed that this approximate numerical solution is in good agreement with the analytical solution. Furthermore, comparisons of the present results with previously published work show that the present results have high accuracy.
Rotating Squeezed Vacua as Time Machines  [PDF]
S. Al Saleh, L. A. Al Asfar, A. Mahroussah
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.73030
Abstract: Squeezed quantum vacua seems to violate the averaged null energy conditions (ANEC’s), because they have a negative energy density. When treated as a perfect fluid, rapidly rotating Casimir plates will create vorticity in the vacuum bounded by them. The geometry resulting from an arbitrarily extended Casimir plates along their axis of rotation is similar to van Stockum spacetime. We observe closed timelike curves (CTC’s) forming in the exterior of the system resulting from frame dragging. The exterior geometry of this system is similar to Kerr geometry, but because of violation of ANEC, the Cauchy horizon lies outside the system unlike Kerr blackholes, giving more emphasis on whether spacetime is multiply connected at the microscopic level.
Asymptotic Theory for a General Second-Order Differential Equation  [PDF]
A. S. A. Al-Hammadi
Advances in Pure Mathematics (APM) , 2017, DOI: 10.4236/apm.2017.78026
Abstract:
An asymptotic theory developed for a second-order differential equation. We obtain the form of solutions for some class of the coefficients for large x.
Sustained Deficit Irrigation and Mulching on Growth of Sourani Olive Trees in Kuwait  [PDF]
A. Al-Shatti, Habibah S. Al-Menaie
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.33B009
Abstract:

Olea europaea, a native plant of the Mediterranean region, is of great interest to agronomists worldwide, owing to its health beneficial properties and tolerance to harsh environmental conditions, along with its economic importance. The productivity and production efficiency of olive is linearly related to both the level of transpiration and the amount of water supplied. Under conditions of limited supply of good quality water for irrigation in Kuwait, deficit irrigation applied at selected phenological stages can maximize economic gains and minimize environmental damage. Moreover, mulching contributes to a significant reduction in water requirements via reducing soil water losses and increasing soil water retention. In this study, the effects of different irrigation levels, a restitution of 50%, 75% or 100% of the estimated evapotranspiration rate (ETc), and the application of mulching on plant growth under the Kuwait environmental conditions were determined to evaluate the possibilities of reducing the amounts of water supplied with irrigation. Various parameters determining the vegetative growth of the trees such as average height, stem girth and number of branches were recorded at three months intervals. Both the irrigation level and mulching were shown to possess a significant impact on growth of Sourani olive cultivar under the Kuwait environmental conditions. Statistical analysis revealed no significant difference in the height of the trees under all the three irrigation treatments with mulch and trees under 100% ETc devoid of mulch. In contrast, a significant difference was exhibited by trees under 100% ETc with mulch and 50% ETc without mulch. Within each irrigation treatment, trees with mulch presented higher values for plant height, stem girth and number of shoots. Thus deficit irrigation of 50% ETc along with organic mulch was shown to enhance vegetative growth close to its maximum potential by conserving the scarce water resources.

Combined Procedure for Coronary Artery Bypass Grafting and Pulmonary Hydatid Disease  [PDF]
A. Al Khaddour, S. Al Hashimi, N. Abbas
World Journal of Cardiovascular Surgery (WJCS) , 2016, DOI: 10.4236/wjcs.2016.61003
Abstract: In this study we reported one case of combined procedure for coronary artery bypass grafting and excision of right pulmonary hydatid cyst. Concerns of possible hydatid systemic dissemination as a result of direct vascular breaches are raised. We suggest that avoidance of cardiopulmonary bypass (CPB) if that possible is beneficial for the treatment. If not possible then the excision and clearance of the hydatid cyst should be done in the first place before going on bypass.
Solving the Linear Oscillatory Problem without Damping with Random Loading Condition Using the Decomposition Method  [PDF]
Amnah S. Al-Juhani, Aleh A. Al-Shammari
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.73038
Abstract: In this paper we study the solution of random linear oscillatory equation \"\"?without damping and with random leading condition using the method. Finally, the time evolution of the mean, variance and standard deviation has been plotted for a range of values of the natural frequency w.
Knowledge and Attitude of Health Care Workers toward Human Immunodeficiency Virus Infection in King Abdulaziz Medical City  [PDF]
Fahad A. Al-Owais, Mohammed S. Al-Abdullah, Adel F. Al-Othman
Advances in Infectious Diseases (AID) , 2015, DOI: 10.4236/aid.2015.52010
Abstract: Background: Worldwide data shows that the stigma and discrimination for AIDS patients by health care providers have a negative impact on its epidemic. It discourages people from seeking care or being tested for HIV, thus reducing access to HIV/AIDS prevention. The study aims to evaluate the knowledge of the HCWs (health care workers) in King Abdulaziz Medical City about human immunodeficiency virus infection and their attitudes whenthey encounter HIV/AIDS patients. Methodology: A cross-sectional study was designed to collect data using self-administered structured questionnaire from 90 health care workers. It was distributed among HCWs in different wards in King Abdulaziz Medical City in Riyadh in August 2014. Results: The study included a total number of 90 heath care workers, of which 31 were physicians and 59 were nurses. Around 81 (90%) of HCWs knew the causative agent for AIDS. Only 22 (24%) of HCWs knew the level of risk of HIV transmission following needle stick injury. Most of HCWs 66 (73%) knew that sexual practice was the most common mode of transmission. Around 27 (87%) of physicians and 33 (56%) of nurses were able to answer that antiretroviral therapy had the ability to control HIV-infection. In addition, 9 (10%) of HCWs believed that AIDS was curable. Conclusion: It was obvious from our study that there was some amount of general information and knowledge with our HCWs. However, an educational campaign will try to increase the level of awareness and clear any misconception or misleading theories about HIV infection with our health care workers.
Privacy Preserving Risk Mitigation Approach for Healthcare Domain  [PDF]
Shaden S. Al Aqeeli, Mznah A. Al-Rodhaan, Yuan Tian, Abdullah M. Al-Dhelaan
E-Health Telecommunication Systems and Networks (ETSN) , 2018, DOI: 10.4236/etsn.2018.71001
Abstract: In the healthcare domain, protecting the electronic health record (EHR) is crucial for preserving the privacy of the patient. To help protect the sensitive data, access control mechanisms can be utilized to restrict access to only legitimate users. However, an issue arises when the authorized users abuse their access privileges and violate privacy preferences of the patients. While traditional access control schemes fall short of defending against the misbehavior of authorized users, risk-aware access control models can provide adaptable access to the system resources based on assessing the risk of an access request. When an access request is deemed risky, but within acceptable thresholds, risk mitigation strategies can be exploited to minimize the risk calculated. This paper proposes a risk-aware, privacy-preserving risk mitigation approach that can be utilized in the healthcare domain. The risk mitigation approach controls the patient’s medical data that can be exposed to healthcare professionals, according to their trust level as well as the risk incurred of such data exposure, by developing a novel Risk Measure formula. The developed Risk Measure is proven to manage the risk effectively. Furthermore, Risk Mitigation Data Disclosure algorithms, RIMIDI0 and RIMIDI1, which utilize the developed risk measures, are proposed. Experimental results show the feasibility and effectiveness of the proposed method in preserving the privacy preferences of the patient. Since the proposed approach exposes the patient’s data that are relevant to the undergoing medical procedure while preserving the privacy preferences, positive outcomes can be realized, which will ultimately bring forth quality healthcare services.
Prevalence and Risk Factors of Hepatitis B and Hepatitis C Virus Infections among Patients with Chronic Renal Failure in Zabeed City, Yemen Republic  [PDF]
Mohammed A. Al-Hegami, Abdullah Al-Mamari, Abdulrahman S. Al-Kadasse, Fadhl A. S. Al-Gasha’a, Sadeq Al-Hag, Adel A. S. Al-Hegami
Open Journal of Medical Microbiology (OJMM) , 2015, DOI: 10.4236/ojmm.2015.53017
Abstract: Background and Aims: Patients on hemodialysis (HD) are at high risk of viral hepatitis due to high number of blood transfusion sessions, prolonged vascular access, high exposure to infected patients and contaminated equipment, or cross contamination from the dialysis circuits and pose problems in the management of patients in the renal dialysis units. This study was done to determine the prevalence of Hepatitis B virus (HBV) & Hepatitis C virus (HCV), in patients on hemodialysis in Zabeed City, Yemen Republic, and address the major risk factors for transmission of these viruses among HD patients. Materials and Methods: In this cross-sectional study, during June, 2013 to October, 2014, a total of 243 chronic hemodialysis patients were tested. Patients were selected from many regions by cluster sampling from Zabeed public hospital, (hemodialysis center) in Zabeed City, Yemen Republic. A close ended and multiple choice-based questionnaires were completed and HBsAg and anti-HCV antibodies were assessed using third generation enzyme linked immunoassay kit as serological testing and data were analyzed using the SPSS-20 software. Results: The overall prevalence of positive HBsAg was (48.83%) while positive anti-HCV was (46.01%) and (5.16%) mixed infection with HBV and HCV. Analysis of risk factors in patients with HBV & HCV infection is showed the history of blood transfusion and duration of hemodialysis was found to be a statistically significant (P < 0.05) as risk factor for HBV and HCV infection. Conclusion: The evaluation suggests that blood transfusion and duration of hemodialysis may be the main most important risk factor for HBV and HCV infection among hemodialysis patients.
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