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Search Results: 1 - 10 of 145085 matches for " Nada F. Tawfiq "
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Radon Concentration in Soil and Radon Exhalation Rate at Al-Dora Refinery and Surrounding Area in Baghdad  [PDF]
Nada F. Tawfiq, Jaafar Jaleel
Detection (Detection) , 2015, DOI: 10.4236/detection.2015.34006
Abstract: Radongas concentrations in soil samples were determined from depths (surface, 15, and 30) cm for nine locations in Al-Dora refinery and surrounding area using “sealed can technique” and CR-39 solid state nuclear track detectors. The radon concentration in surface samples ranged from 810.08 to 1380.08 Bq/m3 with an average 1137.71 Bq/m3. The radon concentration in soil at the depth 15 cm was ranged from 490.5 to 1197.52 Bq/m3 with an average 732.78 Bq/m3 and at the depth 30 cm was ranged from 362.07 to 889.53 Bq/m3 with an average 529.41 Bq/m3. The surface exhalation rate in surface soil samples ranged was 0.44, to 0.99 Bq·m-2·h-1 with average 0.61 Bq·m-2·h-1. The surface exhalation rate in soil samples at the depth 15 cm was ranged from 0.22 to 0.64 Bq·m-2·h-1 with average 0.39 Bq·m-2·h-1. The surface exhalation rate in soil samples at the depth 15 cm was ranged from 0.22 to 0.64 Bq·m-2·h-1 with average 0.39 Bq·m-2·h-1. The surface exhalation rate and the mass exhalation rate in soil samples at the depth 30 cm ranged from 0.19, to 0.48 Bq·m-2·h-1 with average 0.28 Bq·m-2·h-1. The mass exhalation rate in surface soil samples ranged from 0.09 to 0.21 Bq·kg-1·h-1 with average 0.12 Bq·kg-1·h-1. The mass exhalation rate in soil samples from depth 15 cm was ranged from 0.046 to 0.14 Bq·kg-1·h-1 with average 0.08 Bq
Measurement of Radon Gas Concentrations in Tap Water Samples for Thi-Qar Governorate Using Nuclear Track Detector (CR-39)  [PDF]
Liath Ahmed Najam, Hazim Louis Mansour, Nada Fadhil Tawfiq, Mahmood Salim Karim
Detection (Detection) , 2016, DOI: 10.4236/detection.2016.41001
Abstract: In the present work, we have measured the radon gas concentrations in tap water samples are taken directly from drinking tap water in sites houses being carried in Thi-Qar governorate by using nuclear track detector (CR-39). The results of measurements have shown that the highest average radon concentration in water samples is found in AL-Refai region which is equal to (0.223 ± 0.03 Bq/L), while the lowest average radon gas concentration is found in AL-Fajr region which is equal to (0.108 ± 0.01 Bq/L), with an average value of (0.175 ± 0.03 Bq/L). The highest value of annual effective dose (AED) in tap water samples is found in AL-Refai region, which is equal to (0.814 μSv/y), while the lowest value of (AED) is found in AL-Fajr region which is equal to (0.394 μSv/y), with an average value of (0.640 ± 0.1 μSv/y). The present results have shown that radon gas concentrations in tap water samples are less than the recommended international value (11.1 Bq/L). There for tap water in all the studied sites in Thi-Qar governorate is safe as for as radon concentration being concerned.
One-pion transitions between heavy baryons in the constituent quark model
F. Hussain,J. G. Koerner,Salam Tawfiq
Physics , 1999, DOI: 10.1103/PhysRevD.61.114003
Abstract: Single pion transitions of S wave to S wave, P wave to S wave and P wave to P wave heavy baryons are analyzed in the framework of the Heavy Quark Symmetry limit (HQS). We use a constituent quark model picture for the light diquark system with an underlying SU(2N_{f}) X O(3) symmetry to reduce the number of the HQS coupling factors required to describe these transitions. We also use the quantum theory of angular momentum to rewrite the one-pion transitions constituent quark model results in a more general form using the 6j- and 9j-symbols. We finally estimate the decay rates of some single pion transitions between charm baryon states.
$SU(2N_{f})\otimes O(3)$ light diquark symmetry and current-induced heavy baryon transition form factors
F. Hussain,J. G. K?rner,J. Landgraf,Salam Tawfiq
Physics , 1995, DOI: 10.1007/s002880050069
Abstract: We study the current-induced bottom baryon to charm baryon transitions in the Heavy Quark Symmetry limit as $m_{q}\rightarrow \infty$. Our discussion involves $s$-wave to $s$-wave as well as $s$-wave to $p$-wave transitions. Using a constituent quark model picture for the light diquark system with an underlying $SU(2N_{f})\otimes O(3)$ symmetry and the heavy quark symmetry we arrive at a number of new predictions for the reduced form factors that describe these transitions.
Estimation of Natural Radioactivity of Some Medicinal or Herbal Plants Used in Iraq  [PDF]
Laith A. Najam, Nada F. Tafiq, Fouzey H. Kitah
Detection (Detection) , 2015, DOI: 10.4236/detection.2015.31001
Abstract: Nine medicinal or herbal plants used in Iraq were analyzed to determine natural radioactivity. The radionuclides were determined by Gross alpha, beta and gamma spectrometry Proportional counter + NaI(Tl) detector type(XLB5) and gamma-ray spectroscopy with (HPGe) techniques. The activity concentration of 40K ranged from 124.1 Bq/kg in (Crust sample) to 88.3 Bq/kg in (Chamomile sample), for gross alpha ranged from (N.D.) in (Flax sample) to 0.4 cpm in (Anise sample), while for beta ranged from 5.7 cpm in (Flax sample) to 25.6 cpm in (Latency sample) and for gamma ranged from 0.6 cpm in (Thyme sample) to 5.10 cpm in (Coriander and Flax samples).
Notas sobre precintos y ponderales. I. Varios precintos de ul a nombre de ‘Abd Allāh ibn Mālik: correcciones y una posible atribución. II Adiciones a Ponderales andalusíes
Ibrahim, Tawfiq
Al-Qantara : Revista de Estudios Arabes , 2006,
Abstract: In this paper a number of items so far unregistered are added to both the catalogue of lead seals produced during the first period of Islamic Spain, and the catalogue of coin weights related to numismatic issues of different historical periods. En el presente escrito se a aden varias piezas hasta ahora inéditas tanto al corpus de precintos producidos durante el período inicial de al-Andalus, como al de los ponderales relacionados con las emisiones monetarias de épocas diversas en la historia andalusí.
Distribution System Reliability Analysis for Smart Grid Applications  [PDF]
Tawfiq M. Aljohani, Mohammed J. Beshir
Smart Grid and Renewable Energy (SGRE) , 2017, DOI: 10.4236/sgre.2017.87016
Abstract: Reliability of power systems is a key aspect in modern power system planning, design, and operation. The ascendance of the smart grid concept has provided high hopes of developing an intelligent network that is capable of being a self-healing grid, offering the ability to overcome the interruption problems that face the utility and cost it tens of millions in repair and loss. In this work, we will examine the effect of the smart grid applications in improving the reliability of the power distribution networks. The test system used in this paper is the IEEE 34 node test feeder, released in 2003 by the Distribution System Analysis Subcommittee of the IEEE Power Engineering Society. The objective is to analyze the feeder for the optimal placement of the automatic switching devices and quantify their proper installation based on the performance of the distribution system. The measures will be the changes in the reliability system indices including SAIDI, SAIFI, and EUE. In addition, the goal is to design and simulate the effect of the installation of the Distributed Generators (DGs) on the utility’s distribution system and measure the potential improvement of its reliability.
Matlab Code to Assess the Reliability of the Smart Power Distribution System Using Monte Carlo Simulation  [PDF]
Tawfiq M. Aljohani, Mohammed J. Beshir
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.58003
Abstract: Reliability of power systems is a key aspect in modern power system planning, design, and operation. The ascendance of the smart grid concept has provided high hopes of developing an intelligent network that is capable of being a self-healing grid, offering the ability to overcome the interruption problems that face the utility and cost it tens of millions in repair and loss. In this work, we develop a MATLAB code to examine the effect of the smart grid applications in improving the reliability of the power distribution networks via Monte Carlo Simulation approach. The system used in this paper is the IEEE 34 test feeder. The objective is to measure the installations of the Automatic Reclosers (ARs) as well as the Distributed Generators (DGs) on the reliability indices, SAIDI, SAIFI, CAIDI and EUE, and make comparisons with results from a previous study done by the authors using another approach. The MATLAB code should provide close results to the output of the previous research to verify its effectiveness.
Suggest an Aspect-Oriented Design Approach for UML Communication Diagram
Mohammed F. Nather,Dr. Nada N. Saleem
Computer Science , 2013,
Abstract: More and more works are done on the design of the Unified Modeling Language (UML) which is designed to help us for modeling effective object oriented software, Existing Object-Oriented design methods are not mature enough to capture non-functional requirement such as concurrency, fault tolerance, distribution and persistence of a software approach. Our approach proposed to use aspect-oriented software development (AOSD) mechanisms to solve the issues for interactions of the communication diagram in UML that support only the Object-Oriented mechanisms,thus AOSD allow to design programs that are out of reach of strict Object-Orientation and could possibly improve the structures and implementations.
Adaptation and validation of the Charlson Index for Read/OXMIS coded databases
Nada F Khan, Rafael Perera, Stephen Harper, Peter W Rose
BMC Family Practice , 2010, DOI: 10.1186/1471-2296-11-1
Abstract: Two clinicians translated the Charlson index into Read/OXMIS codes. We tested the association between comorbidity score and increased mortality in 146 441 patients from the GPRD using proportional hazards models.This Read/OXMIS translation of the Charlson index contains 3156 codes. Our validation showed a strong positive association between Charlson score and age. Cox proportional models show a positive increasing association with mortality and Charlson score. The discrimination of the logistic regression model for mortality was good (AUC = 0.853).We have translated a commonly used comorbidity index into Read/OXMIS for use in UK primary care databases. The translated index showed a good discrimination in our study population. This is the first study to develop a co-morbidity index for use with the Read/OXMIS coding system and the GPRD. A copy of the co-morbidity index is provided for other researchers using similar databases.Studies of patient health should take into consideration any independent predictors that will affect the outcome of interest. Individual disease status is an important predictor of mortality and health care usage especially in studies of older patients, and in many cases, subjects may have more than one co-existing illness at the same time. Investigators may wish to conduct risk adjustment for the additional health effects of these co-morbid diseases.Previous research has led to the development of summary comorbidity measures which classify patients according to their disease burden [1-4]. The most widely used and validated index of comorbidity was developed by Charlson and colleagues in the late 1980s [5,6]. The Charlson index includes 17 categories of comorbid disease weighted based on their association with 1 year all-cause mortality. Because the Charlson index is weighted and allows for additive scoring, it can take into account both the number and the severity of comorbidity to provide a summary of disease burden for each individual patient
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