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Search Results: 1 - 10 of 20807 matches for " Samir Al Sharif "
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An Experimental Simulation of a Design Three-Port DC-DC Converter  [PDF]
Samir Al Sharif, Ahmad Harb, Haibing Hu, Issa Batarseh
Circuits and Systems (CS) , 2014, DOI: 10.4236/cs.2014.510026
Abstract: Traditional DC-DC converter topologies interface two power terminals: a source and a load. The construction of diverse and flexible power management and distribution (PMAD) systems with such topologies is governed by a tight compromise between converter count, efficiency, and control complexity. The broader impact of the current research activity is the development of enhanced power converter systems suitable for a wide range of applications. Potential users of this technology include the designers of portable and stand-alone systems such as laptops, hand-held electronics, and communication repeater stations. High power topology options support the evolution of clean power technologies such as hybrid-electric vehicles (HEV’s) and solar vehicles. DC-DC converter is considered as an advanced environmental issue since it is a greenhouse emission eliminator. By utilizing the advancement of these renewable energy sources, we minimize the use of fossil fuel. Thus, we will have a cleaner and pollution free environment. In this paper, a three-port DC-DC converter is designed and discussed. The converter was built and tested at the energy research laboratory at Taibah University, Al Madinah, KSA.
Assessment of the Socio-Demographic Factors Associated with the Satisfaction Related to the Childbirth Experience  [PDF]
Elie Al Ahmar, Samir Tarraf
Open Journal of Obstetrics and Gynecology (OJOG) , 2014, DOI: 10.4236/ojog.2014.410083

Assessment of the socio-demographic factors associated with the satisfaction is related to the childbirth experience. Objective: A mother’s satisfaction with the childbirth experience may have instant and lasting effects on her wellbeing, and on the bonding with her infant. The main aim of the study was to assess which socio-demographic factors are associated with this satisfaction. Most factors that authors agree on are: Pain intensity, personal control, self-efficacy, length of labor, method of delivery and numerous other demographic factors. Design: A cross-sectional study. Data was collected using a self-reported survey. Settings: The sample consisted of 100 women, selected from St Georges Hospital and CHU-NDS, who had to speak Arabic and had given birth in the past three days prior to interview. Methods: The multiple linear regressions and the mean test were used to assess which factors were associated with a positive childbirth experience. The Mackey childbirth satisfaction scale, three items from the Wijma delivery Expectancy/Experience questionnaire, a seven item mastery scale developed by Pearlin and Schooler and a background questionnaire were filled by women. Findings: Factors that were linked to a positive birth experience were: Higher age, multiparous women, higher education, high monthly income, unemployment, childbirth preparation, high personal control and self-efficacy, high childbirth and labor pain, fulfilled expectations, shorter period of labor and instrumented delivery. Conclusion: This study demonstrates that satisfaction with the childbirth experience is multi-dimensional with diverse factors foreseeing diverse dimensions of satisfaction.

Suitability of Irbid Clay as Compacted Liners for Landfill, Jordan  [PDF]
Omer S. Mughieda, Munjed Al-Sharif
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.410148

The goal of this study is to investigate the possibility of using the Irbid city clayey soil as compacted clay liner. The geotechnical properties and the permeability characteristics of compacted clayey soil sample obtained from the eastern part of Irbid city were determined to evaluate their suitability as compacted clay liner. Falling head permeability test, unconfined compressive strength and volumetric shrinkage test were conducted on soil samples that were compacted at about 0% and 3% wet of its optimum water content. The leakage rates expected through clay-only and composite geomembrane-clay liners were determined. It could be concluded based on the results of the geotechnical tests and leachate rate calculations that Irbid clay is appropriate to be used as compacted landfill liner material.

Control of Instable Chaotic Small Power System  [PDF]
Samir M. Al Shariff, Ahmad M. Harb
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.32001
Abstract: In this paper, we aim to control an instable chaotic oscillation in power system that is considered to be small system by using a linear state feedback controller. First we will analyze the stability of the mentioned power system by means of modern nonlinear theory (Bifurcation and Chaos). Our model is based on a three bus power system that consists of multi generators containing both dynamic and static loads. They are considered to be in the form of an induction motor in parallel with a capacitor, as well as a combination of constant power along with load impedance, PQ. We consider the load reactive power as the control parameter. At this stage, after changing the control parameter, the study showed that the system is experiencing a subcritical Hopf bifurcation point. This leads to a chaos within the system period doubling path. We then discuss the system controllability and present that the all chaotic oscillations fade away through the linear controller that we impose on the system.
Physicians’ Perception of Drug Information Resources in the Emirate of Abu Dhabi-UAE  [PDF]
Hadaya Gharibyar, Yasser Sharif, Kefah Al Qawasme, Sahar Fahmy
Pharmacology & Pharmacy (PP) , 2013, DOI: 10.4236/pp.2013.41007
Abstract: Objectives: To determine physicians’ preferences for different drug information resources in the United Arab Emirates. Methods: A questionnaire survey to determine preferences for different drug information resources was created and sent electronically from April 1 to May 13, 2012. A total of 3463 licensed physicians were identified from a comprehensive list of healthcare professionals provided by the Health Authority-Abu Dhabi Licensing Department. A total of 431 started the survey but only 372 physicians completed it entirely. Key Findings: Continuing medical education (46%) was ranked as the most favored source of information, followed by drug information references (28%), diagnosis/patient information (20%), and lastly peer-to-peer interactions (7%). Online sources of drug information were preferable (74%) to hardcopy (26%). A comparison of different physicians’ qualifications (consultant, specialist, and general practitioner) and number of references utilized for a particular topic (up to 3 resources versus 3 references or more) showed that their differences were statistically significant (p-value = 0.000). The most utilized sources of drug information by physicians was the British National Formulary (BNF), followed by Package Inserts, UpToDate, Drugs in Pregnancy & Lactation, Physicians’ Desk Reference, and Micromedex. When asked which drug information resource they would like to have access to, the majority of physicians choose the BNF, followed by UpToDate, MD Consult, Drugs in Pregnancy & Lactation, Micromedex, and Drugs Facts & Comparisons. Physicians from Europe/USA/Australia spent less time utilizing drug information resources (p-value of 0.013) compared to other nationalities. Conclusion: Preferences for different drug information resources did not vary significantly even amongst a diverse group of expatriate physicians licensed to practice in the United Arab Emirates.
Non-Negative Integer Solutions of Two Diophantine Equations 2x + 9y = z2 and 5x + 9y = z2  [PDF]
Md. Al-Amin Khan, Abdur Rashid, Md. Sharif Uddin
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.44086
Abstract: In this paper, we study two Diophantine equations of the type px + 9y = z2 , where p is a prime number. We find that the equation 2x + 9y = z2 has exactly two solutions (x, y, z) in non-negative integer i.e., {(3, 0, 3),(4, 1, 5)} but 5x + 9y = z2 has no non-negative integer solution.
Experimental Investigation into the Effect of Mechanical Design of an Escalator and Passenger Loading on its Energy Consumption
Lutfi R. Al-Sharif
Lecture Notes in Engineering and Computer Science , 2008,
Trends of Pediatric Outpatients Prescribing in Umm Al Quwain, United Arab Emirates  [PDF]
Suleiman I. Sharif, Aseel H. Nassar, Fatima K. Al-Hamami, Maha M. Hassanein, Ashkur H. Elmi, Rubian S. Sharif
Pharmacology & Pharmacy (PP) , 2015, DOI: 10.4236/pp.2015.61002
Abstract: Background: Data with regard to local drug prescribing in pediatric population is scarce. This study was carried out to investigate the patterns of drug prescribing for pediatric outpatient in a general hospital in the United Arab Emirates. Methods: A total of 707 prescriptions were collected from a governmental hospital in Umm Al Quwain, United Arab Emirates covering the months of June and July, 2014. Encounters issued for patients older than 12 years were rejected. A total of 520 prescriptions for age groups ranging from 1 week to 12 years were studied. Prescriptions were analyzed using WHO drug use indicators. Results: All prescriptions were electronic and head lettered by the name of the hospital. Average number of drugs per prescriptions was 2.6 and all drugs were generics. Name of patient, age and gender and prescriber’s name and E-signature were present in 100%. Patient’s address, allergy and diagnosis were present in 21.15%, 83.26% and 64.42% of prescriptions respectively. Complete dosage regimen was present in all encounters. Patients were prescribed one, two, three, four or more than four drugs per prescription in 23.84%, 27.88%, 26.53%, 12.69%, and 8.65% respectively. The most commonly prescribed therapeutic classes of drugs were antibiotics (44.60%), antihistamines (43.65%), and analgesics/antipyretics (32.30%). The most commonly prescribed drugs among each class were amoxicillin (40%), xylometazoline (61.23%), and paracetamol (87.5%). Conclusion: Present results indicate that prescribing trends for pediatric population seems to be rational. However, there is over use of antibiotics and there are some areas that warrant further attention by the prescribers for a more significantly rational prescribing.
On Simultaneous Farthest Points in
Sh. Al-Sharif,M. Rawashdeh
International Journal of Mathematics and Mathematical Sciences , 2011, DOI: 10.1155/2011/890598
Abstract: Let be a Banach space and let be a closed bounded subset of . For , we set?? . The set is called simultaneously remotal if, for any , there exists such that?? . In this paper, we show that if is separable simultaneously remotal in , then the set of -Bochner integrable functions, , is simultaneously remotal in . Some other results are presented. 1. Introduction Let be a Banach space and a bounded subset of . For , set . A point is called a farthest point of if there exists such that . For , the farthest point map , that is, the set of points of farthest from . Note that this set may be empty. Let . We call a closed bounded set remotal if and densely remotal if is a norm dense in . The concept of remotal sets in Banach spaces goes back to the sixties. However, almost all the results on remotal sets are concerned with the topological properties of such sets, see [1–4]. Remotal sets in vector valued continuous functions was considered in [5]. Related results on Bochner integrable function spaces, , , are given in [6–8]. The problem of approximating a set of points simultaneously by a point (farthest point) in a subset of can be done in several ways, see [9]. Here, we will use the following definition. Definition 1.1. Let be a closed bounded subset of . A point is called a simultaneous farthest point of if We call a closed bounded set of a Banach space simultaneously remotal if each -tuple admits a farthest point in and simultaneously densely remotal if the set of points , where is norm dense in . Clearly, if , then simultaneously remotal is precisely remotal. In this paper we consider the problem of simultaneous farthest point for bounded sets of the form in the Banach space , where is a Banach space. Throughout this paper, is a Banach space, is a closed bounded subset of and , the space of all -valued essentially bounded functions on the unit interval . For , we set . For , we set , almost all . 2. Distance Formula The farthest distance formula is important in the study of farthest point. In this section, we compute the -farthest distance from an element to a bounded set . We begin with the following proposition. Proposition 2.1. Let , then = . Proof. For , Hence, Theorem 2.2. Let be a Banach space and let be a closed bounded subset of . If a function defined by , where , then and Proof. Let . Being strongly measurable, there exist sequences of simple functions , such that as for almost all . We may write . Since is a continuous function of , the inequality implies that Set . Then, So is a simple function for each and for almost all . Hence is measurable.
Best Simultaneous Approximation in Orlicz Spaces
M. Khandaqji,Sh. Al-Sharif
International Journal of Mathematics and Mathematical Sciences , 2007, DOI: 10.1155/2007/68017
Abstract: Let X be a Banach space and let LΦ(I,X) denote the space of Orlicz X-valued integrable functions on the unit interval I equipped with the Luxemburg norm. In this paper, we present a distance formula dist(f1,f2,LΦ(I,G))Φ, where G is a closed subspace of X, and f1,f2∈LΦ(I,X). Moreover, some related results concerning best simultaneous approximation in LΦ(I,X) are presented.
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