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Search Results: 1 - 10 of 417121 matches for " Mahmoud M. Al-Quzwini "
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Performance Evaluation of Traffic Engineering Signal Protocols in IPV6 MPLS Networks  [PDF]
Mahmoud M. Al-Quzwini, Sarmad K. Ibrahim
Communications and Network (CN) , 2012, DOI: 10.4236/cn.2012.44035
Abstract: This paper studies the performance of Traffic Engineering (TE) signal protocols used for load balancing in Multi-Protocol Label Switching (MPLS) networks, namely; Constraint Based Routed Label Distribution Protocol LDP (CR-LDP) and Resource Reservation Protocol (RSVP). Furthermore, the performance of an MPLS network uses these TE signal protocols is compared to that of a conventional Internet Protocol (IP) network. Different applications including voice, video, File Transfer Protocol (FTP) and Hyperlink Text Transfer Protocol (HTTP) are used for the performance evaluation. Simulation results show superior performance of the MPLS network with CR-LDP TE signal protocol in all tested applications.
Low-Temperature Synthesis of Nanocrystalline Mn0.2Ni0.8Fe2O4 by Oxalate Precursor Route  [PDF]
Mahmoud M. Hessien, Zaki I. Zaki, Al-Qahtani Mohsen
Advances in Materials Physics and Chemistry (AMPC) , 2013, DOI: 10.4236/ampc.2013.31A001

Manganese nickel ferrite (Mn0.2Ni0.8Fe2O4) powder was synthesized through oxalate precursor route. The effect of annealing temperature (400 - 1100) on the formation, crystalline size, morphology and magnetic properties was systematically studied. The resultant powders were investigated by thermal analyzer (TG-DTG-DSC), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). Based on thermal analysis results, the oxalate mixture decomposed thermally in multisteps weight loss up to about 680. XRD indicated that Mn0.2Ni0.8Fe2O4 formed at much lower annealing temperature (≤400) but contained α-Fe2O3 impurity. The hematite phase decreased by increasing the annealing temperature. The lattice parameters were increased with increasing annealing temperature up to 1000.

Factor and Cluster Analysis as a Tool for Patient Segmentation Applied to Hospital Marketing in Jordan  [PDF]
Lamees M. Al-Durgham, Mahmoud A. Barghash
American Journal of Operations Research (AJOR) , 2015, DOI: 10.4236/ajor.2015.54023
Abstract: Hospital marketing is becoming important for the survival and the prosperity of the health service. In addition, it indirectly acts as a formal feedback channel for the customer requirements, preferences, suggestions and complaints. In this work we have undertaken a survey based marketing study for two main objectives: The first being to better understand the patient clusters through k-means clustering and the second to understand customer perception of the different known quality perspectives through factor rotated and unrotated analysis. All of the questionnaires were designed according to international studies. Based on general descriptive statistics, items classified with higher variance but important, are: clean environment, doctors and nurses capabilities, and specialized doctors. Items that are less important with low variance are: food type, lighting and insurance. Also, items classified as more important with low variance are: recommended, no mistakes, and the cost. Using factor analysis rotated and unrotated reduced the variables into five main variables described as: medical aspects, psychological aspects, cost aspects, hospital image and ease of access and procedures. Using k-means clustering, the customers can be clustered into four main clusters with two of them described as general patient with wide variety of interest, serious cases interested in specialized doctors and food, and very serious case with high stress on equipment, no mistakes.
Obesity in Relation to Ovarian Response in IVF Treatment  [PDF]
Howaida Hashim, Mahmoud Gehad, Badawi Khalid, Fahad Al Salman, Samar Hassan, Afaf Felemban, Haya Al Fozan, M. Al Bugnah
Advances in Reproductive Sciences (ARSci) , 2018, DOI: 10.4236/arsci.2018.62005
Abstract: Introduction: The effect of Body Mass Index (BMI), which reflects the woman’s obesity, in IVF treatment cycle, remains unclear. In 1997, the World Health Organization (WHO) provided authoritative refinements to the over-weight terminology and BMI cutoffs [1]. Objective: To verify the relationship between BMI and ovarian response in IVF treatment cycle. Design: Retrospective study. Materials & Methods: The study includes 2625 IVF treatment cycles performed in our IVF center in the period of 4 years. Patients were divided into five groups using the WHO criteria according to their BMI [2]. Cancellation rate, mean last E2 before hCG administration, mean endometrial thickness, mean duration of stimulation, number of eggs retrieved, fertilization rate, pregnancy and abortion rates were analyzed. The unpaired t-test was used in statistical analysis. Results: There was statistically significant less mean oestradiol level prior to hCG, less endometrial thickness and less number of simulation days as BMI gets higher. In contrast, there was a positive relationship between cancellation rate and higher BMI except with BMI >39 which was not, possibly due to lower number of patients available. But if we look at the cause of cancellation, it was 100% due to insufficient number of follicles obtained for this group (BMI >39). Also, days of stimulation are significantly lower for the same group of patients in comparison with the other groups. Retrieval, fertilization and pregnancy rates were not significant between all groups. Abortion rate gets significantly higher as BMI increased. Conclusion: Overweight affects ovulation, if we consider the cause of cancellation being insufficient number of follicles reflects the poor response. The fertilization and pregnancy rate were not affected once oocytes retrieved. The reduction of weight is an important part of infertility treatment in obese women with regards to the ovarian response and abortion rate in IVF cycle.
On the Electrical and Optical Properties of Polycarbonate /MNCl2 Composite  [PDF]
Hasan M. El Ghanem, Subhi A. Saq’an, Mahmoud Al Saadi, Sa’di M. Abdul Jawad
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.212189
Abstract: The nature of the MnCl2 salt as a filler to polycarbonate , including their composition, particles dimensions and homogeneity of distribution have been studied using different spectroscopic techniques (XRD, DSC and TGA). A slight increases in the chain-chain separation due to the interaction of the MnCl2 salt with the polycarbonate chains was observed , while a decrease in the optical energy gap (Eopt ) of the polycarbonate polymer with increasing the salt concentration was detected .However employing impedance spectroscopy in the frequency range 10Hz up to 106 Hz. reveals an increase in the dielectric permittivity and conductivity with increasing salt content
Automotive Ride Comfort Control Using MR Fluid Damper  [PDF]
Mahmoud El-Kafafy, Samir M. El-Demerdash, Al-Adl Mohamed Rabeih
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.44024
Abstract: In this paper, the performance of automotive ride comfort using Bouc-Wen type magneto-rheological (MR) fluid damper is studied using a two degree of freedom quarter car model. The sliding mode control is used to force the MR damper to follow the dynamics of ideal sky-hock model. The model is tested on two excitations, the first is a road hump with severe peak amplitude and the second is a statistical random road. The results are generated and presented in time and frequency domains using Matlab/Simulink software. Comparison with the fully active, ideal semi-active and conventional passive suspension systems are given as a root mean square values. Simulation results, for the designed controller, show that with the controllable MR damper has a significant improvement for the vehicle road holding then its lateral stability as well as road damage in comparison with passive, fully active and ideal semi-active suspension systems.
Investigating Supply Chain Integration Effects on Environmental Performance in the Jordanian Food Industry  [PDF]
Zu’bi M. F. Al-Zu’bi, Ekhleif Tarawneh, Ayman Bahjat Abdallah, Mahmoud A. Fidawi
American Journal of Operations Research (AJOR) , 2015, DOI: 10.4236/ajor.2015.54019
Abstract: The purpose of this study was to examine the effects of supply chain integration on environmental performance of food manufacturing companies in Jordan. Data for this study were collected from one hundred and nineteen food companies. To answer the study questions, and to verify its hypotheses, descriptive statistical tools and linear regression tests were used. The study results indicated that supply chain integration positively affected environmental performance. Additionally, the results showed that supply chain integration positively affected environmental control and pollution management.
Role of Serum Zinc Level and P300 Event Related Potential in Detection of Minimal Hepatic Encephalopathy  [PDF]
Ghada M. Galal, Mahmoud Saif-Al-Islam, Mohammed Abd Al-Ghafar Abd Al Rahman, Nagwa S. Ahmed, Mona M. Abd El Rhman
Open Journal of Gastroenterology (OJGas) , 2015, DOI: 10.4236/ojgas.2015.56011
Abstract: Background: Minimal hepatic encephalopathy (MHE) is defined as hepatic encephalopathy (HE) without symptoms on clinical/neurological examination, but with deficits in some cognitive areas that can only be measured by neuropsychometric testing. Aim: Our aim was to study serum zinc levels in cirrhotic patients with and without MHE and correlate it with the results of neuropsychological tests and P300 event related potential. Patients and Methods: Fifty-five patients with liver cirrhosis were recruited for the present study. All patients were subjected to full history taking, clinical examination, abdominal ultrasonography, laboratory investigations including liver function tests and serum zinc, psychometric studies (line tracing test and serial dotting test) and P300 event related potential. According to the results of psychometric studies and P300 event related potential, the patients were divided into 3 groups in addition to the control group. Results: Among the 55 patients included in the study, 30 patients had no clinical evidence of HE and 25 patients had overt HE with different grades. In patients with no clinical evidence of HE, psychometric tests and P300 event related potential revealed that 13 patients had MHE, while 17 had no HE. There were significantly lower serum zinc levels in patients with MHE and in cirrhotic patients without HE compared with the healthy controls. Also, zinc levels were significantly lower in higher grades of hepatic encephalopathy. Serum zinc levels showed positive correlation with serum albumin levels and inverse correlation with serial dotting test and P300 latency. Conclusion: Reduced serum zinc level and prolonged P300 latency can serve as predictors of minimal hepatic encephalopathy in cirrhotic patients. Zinc deficiency is common in cirrhotic patients with MHE. These findings may have important prognostic and therapeutic implications in MHE and overt HE patients with zinc deficiency.
Using the Circuit Training Method to Promote the Physical Fitness Components of the Hashemite University Students  [PDF]
Mahmoud Al-Haliq
Advances in Physical Education (APE) , 2015, DOI: 10.4236/ape.2015.53021
Abstract: This study aimed at identifying the effect of using the circuit training method on promoting the physical fitness components among the Hashemite University freshmen students who were enrolled in the Physical Fitness Course. The experimental design was utilized. The study sample consisting of (15) male and (15) female students was enlisted in the Physical Fitness Course in the first semester of the university academic year 2014/2015. The study sample was chosen by the intentional method. The researcher determined the tests that measured the physical fitness components based on those utilized by the Physical Fitness Course lecturers. The psychometric properties of these tests were estimated (i.e., the instrument reliability coefficient was 0.82). Prior and post measurements were taken. Means, standard deviations, and (t) test was computed. The primary result revealed a clear improvement in the participants’ physical fitness components level in the post-measurements.
Evaluation of Oxidative Stress and Antioxidant Status in Diabetic and Hypertensive Women during Labor
Mashael M. Al-Shebly,Mahmoud A. Mansour
Oxidative Medicine and Cellular Longevity , 2012, DOI: 10.1155/2012/329743
Abstract: Pregnancy in insulin-dependent diabetes mellitus is associated with a greater incidence of fetal abnormality. Animal studies suggested that increased free-radical production and antioxidant depletion may contribute to this risk. The objective of this work was to evaluate oxidative stress and antioxidant capacity in hypertensive, diabetics, and healthy control women during labor. Simultaneous determination of antioxidant enzymes activities, namely glutathione peroxidase (GSH-Px), glutathione reductase (GSH-red), superoxide dismutase (SOD), total antioxidant, and lipid peroxides measured as thiobarbituric acid-reactive substances (TBARS) levels, were carried out in maternal plasma during labor. Plasma GSH-Px activity was found to be significantly increased as it doubled in hypertensive, and diabetic women when compared with healthy control women (<0.05). In contrast, plasma SOD activity was significantly decreased in both groups when compared to the control group (<0.05). No significant differences were detected in GSH-Red activity between diabetic, hypertensive and control groups. Alterations in antioxidant enzyme activities were accompanied by a significant increase in the levels of plasma lipid peroxides in hypertensive and diabetic women during labor. Plasma levels of total antioxidants were significantly increased in diabetic women as compared with the control group. Based on our results, it may be concluded that enhanced generation of oxidative stress causes alteration of antioxidant capacity in diabetic and hypertensive women during labor. Alterations in antioxidant and prooxidant components may result in various complications including peroxidation of vital body molecules which may be regarded as an increased risk factor for pregnant women as well as the fetus.
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