Mathematics, Statistics & Physics: Recent submissions
Now showing items 361-380 of 740
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The effect of doping MoSe2 by clusters of noble metals on its adsorption for NH3
( Elsevier , 2022 , Article)The development of industrial activities is associated with negative impacts on the quality of the environment including emission of hazardous gases. Therefore, it is critical to produce sensitive and selective gas detectors ... -
Tunable Hydroxyapatite/Magnetite Nanohybrids with Preserved Magnetic Properties
( Wiley , 2022 , Article)Magnetic nanoparticles (MNPs) have been extensively investigated in a wide range of biomedical applications. Controlled coating of the MNPs is commonly utilized to protect and maintain their magnetic properties and to ... -
Modeling the population-level impact of treatment on COVID-19 disease and SARS-CoV-2 transmission
( Elsevier , 2022 , Article)Different COVID-19 treatment candidates are under development, and some are becoming available including two promising drugs from Merck and Pfizer. This study provides conceptual frameworks for the effects of three types ... -
Patient Counseling Practices among Community Pharmacists in Qatar
( Hamad bin Khalifa University Press (HBKU Press) , 2016 , Conference Paper)Patient counseling is a term used in the field of pharmacy to describe the communication that takes place between a pharmacist and a patient in regards to his or her medication therapy. Patient counseling is deemed to be ... -
Assessment of Student Learning Outcomes for Assurance of Learning at Qatar University
( Hamad bin Khalifa University Press (HBKU Press) , 2014 , Conference Paper)From 2006 to 2012 Qatar University transitioned from doing no program level outcomes-based assessment of student learning to implementation of a robust, effective, and institutionally pervasive Student Learning Outcomes ... -
Production Of Size-selected Copper Nanoclusters For Petroleum Refinery Applications
( Hamad bin Khalifa University Press (HBKU Press) , 2014 , Conference Paper)Atomic nanoclusters exhibit large surface to volume ratio which enhances their ability to interact with external materials, thus, they can be utilized efficiently for catalysts and gas sensing applications. Copper (Cu) ... -
Social And Behavioral Risk Factors Influencing Driver's Involvement In Rd Traffic Accidents In Qatar
( Hamad bin Khalifa University Press (HBKU Press) , 2014 , Conference Paper)On average, traffic accidents kill around 137 people around the world every hour. In 2004, road injuries were the first leading cause of death and predicted to be the fifth leading cause of death by 2030. Although the ... -
Modified Profile Likelihood Estimation in the Lomax Distribution
( Horizon Research Publishing , 2022 , Article)In this paper, we consider improving maximum likelihood inference for the scale parameter of the Lomax distribution. The improvement is based on using modifications to the maximum likelihood estimator based on the ... -
On Indefinite Quadratic Optimization over the Intersection of Balls and Linear Constraints
( Springer , 2022 , Article)In this paper, we study the minimization of an indefinite quadratic function over theintersection of balls and linear inequality constraints (QOBL). Using the hyperplanesinduced by the intersection of each pair of balls, ... -
Online monitoring of climatic parameters: a statistical study about environmental changes in Qatar
( Hamad bin Khalifa University Press (HBKU Press) , 2016 , Conference Paper)Twentieth century has witnessed unprecedented changes in the climate whose profound effects are also observed on ecosystem and human life. The source of these changes are presumed to be increasing concentration of greenhouse ... -
Fabrication of Selective Sensors for Hg2+ Traces in Water Using Graphene Decorated with Metal Nanoclusters
( Hamad bin Khalifa University Press (HBKU Press) , 2016 , Conference Paper)Mercury metal is released into water by different sources including sewage industrial waste, thus, it can enter human food chain. It is considered one of the most harmful pollutant of heavy metals since it is non-biodegradable, ... -
"The use of Arabic version of Social Communication Questionnaires (SCQ) in School Screening for Autism Spectrum Disorder (ASD) in Qatar"
( Hamad bin Khalifa University Press (HBKU Press) , 2016 , Conference Paper)Introduction: The prevalence rate of Autism Spectrum Disorder (ASD) in Qatar is uncertain, obtaining a reliable estimate is important in shedding the light on the magnitude of the problem, and help in better planning for ... -
Oyster oscillator: a novel mega-stable nonlinear chaotic system
( Springer , 2021 , Article)Designing novel mega-stable chaotic oscillators has been a hot topic of research lately. In the current paper, a two-dimensional mega-stable oscillator is presented. The oscillator has a vast amount of coexisting limit ... -
A symmetric oscillator with multi-stability and chaotic dynamics: bifurcations, circuit implementation, and impulsive control
( Springer , 2021 , Article)Finding chaotic oscillators with unique properties is a hot topic. In this paper, a symmetric oscillator with multi-stability is proposed. This oscillator has bounded dynamics for any initial conditions. It is also shown ... -
Symmetric oscillator: Special features, realization, and combination synchronization
( MDPI , 2021 , Article)Researchers have recently paid significant attention to special chaotic systems. In this work, we introduce an oscillator with different special features. In addition, the oscillator is symmetrical. The features and ... -
System of variational inequalities with interconnected obstacles
( Taylor and Francis , 2020 , Article)Our objective with this paper is to discuss multi-switching problems, arising as variational inequalities, that models decision under uncertainty. We prove general existence theory through monotone scheme and discuss ... -
Enhancing the detection ability of control charts in profile monitoring by adding RBF ensemble model
( Springer , 2022 , Article)While numerous contributions and applications have been extended in profile monitoring, little attention has been paid to employing machine learning techniques in development of control charts. In this paper, a novel control ... -
Nonparametric multivariate covariance chart for monitoring individual observations
( Elsevier , 2022 , Article)Parametric and nonparametric multivariate control charts that are proven very useful in monitoring the covariance matrix of multivariate normally or “nearly” normally distributed continuous datasets have been proposed in ... -
Multivariate control charts for monitoring process mean vector of individual observations under regularized covariance estimation
(2021 , Article)Multivariate control charts are generally used in industries for monitoring and diagnosing processes characterized by several process variables. The applications of charts assume that the in-control process parameters are ... -
Exponentially weighted moving average control charts for monitoring coefficient of variation under ranked set-sampling schemes
( Taylor and Francis , 2021 , Article)Several coefficients of variation (CV) control charts under simple random schemes (SRS) have been proposed to monitor process relative variability. However, little attention has been given to investigating the performance ...
