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Search Results: 1 - 10 of 543157 matches for " R. M. Alotaibi "
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High Power Interleaved Boost Converter for Photovoltaic Applications  [PDF]
Ahmed A. Hafez, A. Y. Hatata, M. I. Alsubaihi, R. M. Alotaibi, F. T. Alqahtani, S. O. Alotaibi, A. M. Alhusayni, M. D. Alharbi
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.65001
Abstract: Interfacing DC sources to load/power grid requires DC converters that produce minimum level of current ripples. This is to limit the losses and hence increase the life span of these sources. This article proposes a simple inter-leaved boost converter that interfaces PhotoVoltaic (PV) module into a common DC-link. The article also addresses the faulty mode operation of the proposed circuit while advising the appropriate remedy actions. A MATLAB and Simulink dynamic platform are used to simulate the transient performance of the proposed converter. The results revealed the effectiveness and the viability of the proposed converter in reducing the ripples in the PV current without employing bulky input inductors or increasing the switching frequency.
Poor Knowledge of Tuberculosis among the Population of Jeddah and Makkah Saudi Arabia, a High-Risk Area  [PDF]
Ssakher M. AlOtaibi, Abdullah F. Almoshadq, Hosam A. Alghanmi, Fetoon Aljuiad, Yasmin R. Soliman, Abdulmajeed T. Alzuair, Osama A. Alzahrani, Abdulrahman A. Algarni, Malak Y. Ali
Journal of Tuberculosis Research (JTR) , 2016, DOI: 10.4236/jtr.2016.43010
Abstract: SETTING: Millions of pilgrims visit Makkah (Mecca), Saudi Arabia, from regions of endemic tuberculosis. Little consideration has been given to the potential impact of this disease on the local population. OBJECTIVES: To assess knowledge about TB among residents of Makkah and Jeddah (Makkah’s principal travel gateway). METHODS: A cross-sectional survey of 1004 residents. Data were analyzed by gender. RESULTS: Spread of TB by coughing was a transmission route known by 44.2% of males and 59.6% of females (P < 0.001); 20.0% of participants knew that TB is caused by bacteria; 71.6% of females and 52.3% of males knew TB is infectious (P < 0.001). Regarding approaches to TB prevention, 48.0% of respondents answered patient isolation and 15.2% vaccination. Overall, 50.6% of males and 38.3% of females (P < 0.001) would seek modern medical treatment if hemoptysis occurred. With a persistent cough, 65.4% of respondents would do nothing or wait before consulting a healthcare provider. High numbers of “don’t know” responses were recorded throughout the survey. CONCLUSIONS: Within the population across pilgrimage areas in Saudi Arabia, knowledge is lacking concerning TB transmission, the cause of the disease, means of prevention and the success of treatment, highlighting an urge need for better public education.
Infinite System of Differential Equations in Some Spaces
M. Mursaleen,Abdullah Alotaibi
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/863483
Abstract: The first measure of noncompactness was defined by Kuratowski in 1930 and later the Hausdorff measure of noncompactness was introduced in 1957 by Goldenštein et al. These measures of noncompactness have various applications in several areas of analysis, for example, in operator theory, fixed point theory, and in differential and integral equations. In particular, the Hausdorff measure of noncompactness has been extensively used in the characterizations of compact operators between the infinite-dimensional Banach spaces. In this paper, we present a brief survey on the applications of measures of noncompactness to the theory of infinite system of differential equations in some spaces and .
Cesàro Statistical Core of Complex Number Sequences
Abdullah M. Alotaibi
International Journal of Mathematics and Mathematical Sciences , 2007, DOI: 10.1155/2007/29869
Abstract: We establish some core inequalities for complex bounded sequences using the concept of statistical (C,1) summability.
Patient Enablement in Chronic Diseases in Primary Health Care, Riyadh City, KSA  [PDF]
Rabaa K. Al Momen, Mishal M. Alotaibi, Osama Abdelhay
International Journal of Clinical Medicine (IJCM) , 2015, DOI: 10.4236/ijcm.2015.69082
Abstract: Background: Chronic diseases continue to cause high morbidity and mortality in Saudi Arabia. Patients severing from diabetes mellitus, hypertension and associated complications have recently increased and most of these patients find it extremely difficult to understand or cope with their illness. The objective of this study is to determine the level of patients’ enablement in chronic disease and its predictors. Methods: A community based cross-sectional study was conducted between December 2014 and January 2015. Six hundred and four (604) Patients attending the Chronic Disease Clinic in Alwazarat Health center were randomly selected to participate in the study. Patients aged 18 years and above, who willingly agreed to participate, were included in the study. Self-reported questionnaire was used to determine patient level of enablement. Descriptive statistics such as mean and median were calculated and binary logistic regression was employed to determine the predictors of patient’s enablement to chronic disease. Results: Our results show that five hundred and sixty five (565) out of (604) patients participated in the study with 86.6% response rate. Type 2 diabetes mellitus affecting 40.65% while hypertension affecting 37.79% of the patients in Al wazarat health center. Patient’s enablement to chronic disease was very low and ranged between 2.41 and 1.53 out of 5.0. Binary logistic regression shows that age (male: OR; 0.84, 95% CI, 0.72 - 1.04, female. OR; 1.04, 95% CI 0.88 - 1.39), marital status (male: OR; 0.72, 95% CI 0.54 - 1.11, female: OR 1.01; 95% CI 0.82 - 1.29), patient educational level and number of problems discussed with physician and consultation length between male patients and their physician were statistically significant and correlated with patients enablement to chronic disease (P < 0.05). Conclusion: This study shows that patient’s enablement in chronic disease is very low but constitutes an important arm in patients care management. It should be considered as a measurable patient outcome from healthcare services. More prospective studies on this important topic are highly recommended.
Elemental Compositions of Some Eye Shadow Products Marketed in Saudi Arabia  [PDF]
Faten M. Ali Zainy, Fatima Bannani, Ohoud A. Alotaibi
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2018, DOI: 10.4236/jcdsa.2018.84024
Abstract: This study focuses on the determination, as well as, the composition of some heavy metals contained in 12 eye shadow cosmetic samples. An elemental analysis of heavy metals (Ti, Cr, Fe, Ni, Cu, Co, Mn, Pb, and Zn) was performed by X-ray Fluorescence. The constitution of some samples was studied by Powder X-Ray Diffraction. Heavy metals exist as zinc oxide, Titanium dioxide, Iron oxide, Bismuth oxychloride, and lead sulfide. The quantification of selected toxic heavy metals lead, copper and nickel were achieved by Inductively Coupled Plasma-Optical Emission Spectrometry after digestion with concentrated acids. In all analyzed samples lead had a concentration less than 20 ppm, which indicated good manufacturing practice. Copper and nickel levels were within acceptable concentrations, but overpasses the safe limit appeared in China samples. The prolonged use of cosmetics case an allergic problem for consumers. Therefore, quality controls are highly controlled for imported products with different regulations.
Invariant and Absolute Invariant Means of Double Sequences
Abdullah Alotaibi,M. Mursaleen,M. A. Alghamdi
Journal of Function Spaces and Applications , 2012, DOI: 10.1155/2012/465364
Abstract: We examine some properties of the invariant mean, define the concepts of strong -convergence and absolute -convergence for double sequences, and determine the associated sublinear functionals. We also define the absolute invariant mean through which the space of absolutely -convergent double sequences is characterized.
Double-double electromagnetically induced transparency with amplification
Hessa M. M. Alotaibi,Barry C. Sanders
Physics , 2013, DOI: 10.1103/PhysRevA.89.021802
Abstract: We show that an alkali atom with a tripod electronic structure can yield rich electromagnetically induced transparency phenomena even at room temperature. In particular we introduce double-double electromagnetically induced transparency wherein signal and probe fields each have two transparency windows. Their group velocities can be matched in either the first or second pair of transparency windows. Moreover signal and probe fields can each experience coherent gain in the second transparency windows. We explain using a semi-classical-dressed-picture to connect the tripod electronic structure to a double-\Lambda\ scheme.
Statistical Convergence of Double Sequences in Locally Solid Riesz Spaces
S. A. Mohiuddine,Abdullah Alotaibi,M. Mursaleen
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/719729
Abstract: Recently, the notion of statistical convergence is studied in a locally solid Riesz space by Albayrak and Pehlivan (2012). In this paper, we define and study statistical -convergence, statistical -Cauchy and -convergence of double sequences in a locally solid Riesz space.
Statistical Approximation for Periodic Functions of Two Variables
Abdullah Alotaibi,M. Mursaleen,S. A. Mohiuddine
Journal of Function Spaces , 2013, DOI: 10.1155/2013/491768
Abstract: We prove a Korovkin type approximation theorem for a function of two variables by using the notion of statistical summability . We also study the rate of statistical summability of positive linear operators. Finally we construct an example to show that our result is stronger than those previously proved for Pringsheim's convergence and statistical convergence.
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