King AbdulazizUniversity

Jeddah, Saudi Arabia

King AbdulazizUniversity

Jeddah, Saudi Arabia
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Abd El-Kader S.M.,King Abdulaziz University | Al-Jiffri O.H.,King AbdulazizUniversity
African Health Sciences | Year: 2016

Background: Depression is a highly prevalent co-morbidity in Chronic Obstructive Pulmonary Disease (COPD) which was shown to be associated with a worse course of disease, including reduced quality of life and increased symptoms burden, healthcare use, and even mortality. It has been speculated that systemic inflammation may play a role in the presence of depression. Currently, physical activity is an important lifestyle factor that has the potential to modify inflammatory cytokines and depression, however our understanding of how to use exercise effectively in COPD patients to alleviate depression related systemic inflammation is incomplete and has prompted our interest to identify the type and intensities of effective exercise. Objective: The aim of this study was to measure the changes in depression related systemic inflammation of aerobic exercise training in COPD patients in Jeddah area. Material and methods: Eighty patients with moderate severity of COPD participated in this study and were divided into two groups; the first group received aerobic exercise, whereas the second group received no exercise training for 12 weeks. Results: The mean values of tumor necrosis factor-alpha (TNF-α), interleukin-4 (IL-4), interleukin-6 (IL-6), C-reactive protein (CRP) and Beck Depression Inventory (BDI) scores were significantly decreased in in group (A) after treatments, but the changes in group (B) were not significant .Also, there were significant differences between mean levels of the investigated parameters in group (A) and group (B) at the end of the study. Conclusion: Aerobic exercise is an effective treatment policy to improve depression related to systemic inflammation in patients with chronic obstructive pulmonary disease. © 2016, Makerere University, Medical School. All rights reserved.

Khayyat S.,King AbdulazizUniversity | Selvin R.,Don Bosco Institute of Technology
Science of Advanced Materials | Year: 2017

The isomerization of citronellal to isopulegol is an important step in the synthesis of menthol. Several solid acid catalysts were evaluated for this reaction. However, to maintain economic viability, a suitable heterogeneous system which exhibit better activity and selectivity comparable or superior to the existing catalytic methods is needed. Among solid acids, larger pore zeolites have been found to exhibit superior property for isomerization of citronellal to isopulegol. However, the active sites inside the ZSM-5 micropores imposes severe mass transfer constrains. Hierarchical porous zeolite contains micro, meso and macro pores in the same material to overcome the mass transfer constrains. The present paper is aimed at an investigation of the catalytic activity of hierarchical porous nanocrystalline ZSM-5 towards the isomerization of citronellal to isopulegol. The catalyst was characterized by DLS, XRD, FT-IR, SEM, and ASAP analyses. The effects of various parameters such as, catalyst weight, reaction temperature, citronellal concentration and reusability of catalyst were studied. The results show that the hierarchical porous nanocrystalline ZSM-5 catalysts are highly efficient, selective, reusable and environmentally benign system for the isomerization of citronellal to isopulegol. © 2017 by American Scientific Publishers All rights reserved.

Huang Y.-S.,National Ilan University | Weng Y.-S.,Army Academy | Zhou M.,New Jersey Institute of Technology | Zhou M.,King AbdulazizUniversity
IEEE Transactions on Intelligent Transportation Systems | Year: 2015

Timed Petri nets (TPNs) are useful for performance evaluation of discrete event systems due to their mathematical formalism. This paper focuses on their use to model the preemption of emergency vehicle systems. The advantage of the proposed approach is the clear presentation of traffic light behaviors in terms of conditions and events that cause the preemption of phases being changed. The resulting models allow one to identify and thus avoid urgent spectacles in such systems by conditions and events of the model that control the phase of traffic light alternations. Moreover, this work proposes a new emergency vehicle preemption policy to ensure that emergency vehicles can pass through intersections with no or less delay. The analysis is performed to demonstrate how the models enforce the phase of traffic transitions by a reachability graph with time information. The liveness and reversibility of the proposed model are verified. To our knowledge, this is the first work that employs TPNs to model an emergency vehicle preemption system and identify its urgent spectacles for the purpose of their complete avoidance. This helps advance the state-of-the-art in traffic safety related to the intersection of roadways. © 2000-2011 IEEE.

Ahmed M.M.M.,King AbdulazizUniversity | Ahmed M.M.M.,Genetic Engineering and Biotechnology Research Institute GEBRI | Hafez E.E.,Genetic Engineering and Biotechnology Research Institute GEBRI | Mona A.M.,Genetic Engineering and Biotechnology Research Institute GEBRI | And 2 more authors.
World Applied Sciences Journal | Year: 2014

Food poisoning is a common, yet distressing and sometimes life-threatening problem for millions of people all over the world. More than 250 different diseases can cause food poisoning. Gram's staining test on these colonies to detect the bacterial type. This step showed that all bacterial samples were gram positive bacteria and confirmed that high degree of similarity between the aerobic and faculatitative aerobic samples in the shape. Six different antibiotics were used to study the resistance of the isolated bacteria against these antibiotics. Different concentrations were used in the culture media starting with 0.005 mg/ml. The MIC was according to the antibiotic activity against the examinated bacteria. The lowest minimum inhibition concentration (MIC) of tetracycline (0.005 mg/ml).then, ampicillin and kanamycin (0.025 mg/ml), then neomycin and spectinomycin (0.08 mg/ml) the highest MIC was in case of chloromphenicol (0.125 mg/ml). This result was confirmed that different degree of antibiotic resistance affecting on the bacterial growth, bacteria have the highest resistance to chloromphenicol and moderate resistance to ampicillin, kanamycin, neomycin and spectinomycin while have the lowest resistance to tetracycline. © IDOSI Publications, 2014.

Thabet A.,Aswan University | Mobarak Y.,King AbdulazizUniversity | Mobarak Y.,Aswan University
International Journal of Electrical and Computer Engineering | Year: 2015

Polymer nanocomposites possess promising high performances as engineering materials, if they are prepared and fabricated properly. In this research, it has been processed samples of nanocomposite polymers as electrical insulating materials for application on the electric power cables by using the latest techniques of nanotechnology. This paper has been investigated enhanced dielectric and electrical properties of Polyvinyl chloride PVC as matrix have shown that trapping properties are highly modified by the presence of costless nanofillers clay and fumed silica. An experimental work for dielectric loss and capacitance of the new nanocomposite materials have been investigated and compared with unfilled industrial materials. It is found that a good correlation exists in respect of capacitance and dielectric loss values measured with percentage of nanofillers. Thus, it has been investigated the influence of costless nanofillers material and its concentration on dielectric properties of industrial polymers-based composite systems. A comparative study is performed between the unfilled base polymers, the systems containing one type of nanoparticles clayor fumed silica inside the host polymer with various concentrations. Copyright © 2015 Institute of Advanced Engineering and Science. All rights reserved.

Djamah T.,Mouloud Mammeri University | Bettayeb M.,University of Sharjah | Bettayeb M.,King AbdulazizUniversity | Djennoune S.,Mouloud Mammeri University
Asian Journal of Control | Year: 2013

This paper deals with identification of multivariable fractional order systems. The state space model is used, based on the Guidorzi canonical form. An output error identification approach is used, and the parametric sensitivity functions model is developed as a multivariable fractional model. Its simulation is carried out using the fractional bounded integration operator. Different simulations test the method efficiency, and its statistical performance is analyzed, using Monte Carlo simulation at various signal-to-noise ratios. © 2013 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society.

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