Mathematics, Statistics & Physics: Recent submissions
Now showing items 141-160 of 738
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Genomic and Bioinformatics Approaches for Analysis of Genes Associated With Cancer Risks Following Exposure to Tobacco Smoking
( Frontiers Media S.A. , 2018 , Article Review)Cancer is a significant health problem in the Middle East and global population. It is well established that there is a direct link between tobacco smoking and cancer, which will continue to pose a significant threat to ... -
Causes of Undergraduate Students' Underachievement in a Gulf Cooperation Council Country (GCC) University
( SAGE Publications Inc. , 2022 , Article)UNESCO reports enrollment in higher education in the Arab and Gulf Cooperation Council region doubled from 5.1 million in 2000 to 10.7 million in 2015. Despite significant budgets and the world's lowest teacher-to-student ... -
An analytical study of employee happiness in service sectors: A pilot study
( Natural Sciences Publishing , 2021 , Article)The present paper aims to investigate happiness levels of employees in services and underpin disparate evidences from existing literature, to any reported differences in the levels of happiness among employees. This paper ... -
SEIRD model for Qatar COVID-19 outbreak: A case study
( Intercollegiate Biomathematics Alliance , 2021 , Article)The COVID-19 outbreak of 2020 has required many governments to develop mathematical-statistical models of the outbreak for policy and planning purposes. This work provides a tutorial on building a compartmental model using ... -
Using Grades in Core Curriculum Chain Courses as Predictors of Academic Performance in Subsequent Courses: A Study at Qatar University
( SAGE Publications Inc. , 2023 , Article)The study aimed to investigate students' final grades in a linked course or chain course to determine any effect on students' academic performance in their next linked course. Courses with high D, F, and W grades were ... -
Estimation of health-related quality of life in the presence of missing Values in EQ-5D
( Hindawi Limited , 2021 , Article)One of the notes worthy problems in analysis of clinical and observational studies is missing data and nonresponse from patients. Turning a blind eye to the missing behavior may provide biased results with overestimated ... -
Assessing spatial confounding in cancer disease mapping using R
( Blackwell Publishing Ltd , 2020 , Article)Background: Exploring spatial patterns in the context of cancer disease mapping (DM) is a decisive approach to bring evidence of geographical tendencies in assessing disease status and progression. However, this framework ... -
Semiparametric MEWMA for Phase II profile monitoring
( John Wiley and Sons Ltd , 2021 , Article)A control chart is one of the statistical process techniques that is used to monitor different processes. Some processes are characterized by functions or profiles, and a profile is a functional relationship between the ... -
Optimization of tank engine crank shaft material properties
( Taylor and Francis Ltd. , 2023 , Article)Metals and coating materials, with best material properties are highly desired in the field of engineering to control the stresses and strains, that play important role in design strategies. The crankshaft, an important ... -
On the Investigation of Monthly River Flow Generation Complexity Using the Applicability of Machine Learning Models
( Hindawi Limited , 2021 , Article)Streamflow is associated with several sources on nonstationaries and hence developing machine learning (ML) models is always the motive to provide a reliable methodology to understand the actual mechanism of streamflow. ... -
Dynamical analysis of the delayed immune response to cancer
( Elsevier , 2021 , Article)In the antitumor response, cytotoxic CD8 + T cells and the functional organization of CD4 + T cells play an important role. During this research, a mathematical model is built. In this model, the ability of CD4 + T cells, ... -
Novel Bayesian CUSUM and EWMA control charts via various loss functions for monitoring processes
( John Wiley and Sons Ltd , 2023 , Article)In this work, both the cumulative sum (CUSUM) and exponentially weighted moving average (EWMA) control charts have been reconfigured to monitor processes using a Bayesian approach. Our construction of these charts are ... -
Model robust profile monitoring for the generalized linear mixed model for Phase I analysis
( John Wiley and Sons Ltd , 2020 , Conference Paper)The generalized linear mixed model (GLMM) becomes very popular in profile monitoring, especially when the production processes follow nonnormal distribution. In most of the real-life applications in industry, medicine, ... -
Testing statistical assumptions in research
( wiley , 2019 , Book)This book facilitates researchers in checking the assumptions of statistical tests used in their research by focusing on the importance of checking assumptions in using statistical methods, showing them how to check ... -
Positron annihilation lifetime study of pure and treated polyvinyl chloride
( scientific.net , 1997 , Article)Positron annihilation lifetime technique (PAL) has been applied to investigate the behavior of the free volume in pure and doped polyvinyl chloride (PVC) as a function of Pb concentration and temperature. It is noticed ... -
Radon concentration determination in some dwellings of Doha city of Qatar
( Elsevier , 1997 , Article)Yearly average radon concentrations have not been reported yet in Qatar. Only few measurements on indoor radon concentrations have been conducted during the autumn season in 1992. To complete these measurements a determination ... -
Thermalization times of positrons in molecular gases
(2000 , Article)The time that a particle takes to reach thermal equilibrium in gas is a gross measure of the efficiency with which such particle can exchange its kinetic energy with the medium. The time taken for positrons to reach thermal ... -
Microstructure of heat-treated steel probed by positron annihilation
(2001 , Conference Paper)Positron annihilation lifetime technique has been applied to study the microstructure change in steel after heat treatment. For this purpose, the specimens are heat treated in various manners; normalizing, annealing, ... -
Three-body effects in the annihilation of positrons on molecules
( APS , 2002 , Article)The three body effects in the annihilation of positrons on molecules were discussed. The positron annihilation in ethylene gas at room temperature and at densities below one amagat, showed that the mean free positron ... -
Re-emission of slow positrons from tungsten at elevated temperatures
( Elsevier , 2002 , Conference Paper)A series of measurements have been made on the dependence of the intensity and energy spectrum of slow positrons re-emitted from polycrystalline tungsten foil held at temperatures of up to 500 °C. Irrespective of target ...
