Mathematics, Statistics & Physics: Recent submissions
Now showing items 341-360 of 738
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Duration of mRNA vaccine protection against SARS-CoV-2 Omicron BA.1 and BA.2 subvariants in Qatar.
( Nature Research , 2022 , Article)SARS-CoV-2 Omicron BA.1 and BA.2 subvariants are genetically divergent. We conducted a matched, test-negative, case-control study to estimate duration of protection of the second and third/booster doses of mRNA COVID-19 ... -
Harmonic image inpainting using the charge simulation method
( Springer , 2022 , Article)It was recently reported that harmonic inpainting or Laplace interpolation when used in the context of image compression can yield impressive reconstruction results if the encoded pixels were carefully selected. Mathematically, ... -
Simulating local fields in carbon nanotube-reinforced composites for infinite strip with voids
( Springer , 2022 , Article)A numerical simulation of the thermal properties is conducted for an isotropic and homogeneous infinite strip composite reinforced by carbon nanotubes (CNTs) and containing voids. The CNTs can be uniformly or randomly ... -
Effects of BA.1/BA.2 subvariant, vaccination, and prior infection on infectiousness of SARS-CoV-2 omicron infections.
( Oxford University Press , 2022 , Article)Compared to BA.1, BA.2 was associated with lower RT-qPCR cycle threshold (Ct) value-3.53 fewer cycles (95% CI: 3.46-3.60), signifying higher infectiousness. This may reflect higher viral load and/or longer duration of ... -
Likelihood and Bayesian Inference in the Lomax Distribution under Progressive Censoring
( Horizon Research Publishing(HRPUB) , 2022 , Article)The Lomax distribution has been used as a statistical model in several fields, especially for business failure data and reliability engineering. Accurate parameter estimation is very important because it is the base for ... -
Impact of COVID-19 Pandemic News on the Cryptocurrency Market and Gold Returns: A Quantile-on-Quantile Regression Analysis
( MDPI , 2022 , Article)In this paper, we investigate the relationship between the RavenPack news-based index associated with coronavirus outbreak (Panic, Sentiment, Infodemic, and Media Coverage) and returns of two commodities—Bitcoin and gold. ... -
Chimera states in a multi-weighted neuronal network
( Elsevier , 2022 , Article)There are multiple types of interactions among neurons, each of which has a remarkable effect on the neurons' behavior. Due to the significance of chimeras in neural processes, in this paper, we study the impact of different ... -
Differential cryptanalysis of diffusion and confusion based information confidentiality mechanism
( Elsevier , 2022 , Article)Wireless multimedia communications have progressed significantly in recent years. As a result, there is an increasing demand for more secure media transmission to protect multimedia information. Image encryption systems ... -
Image encryption scheme for multi-focus images for visual sensors network
( Springer , 2022 , Article)Image fusion is the technique to obtain an image, possessing spatially and spectrally enhanced as compared to the individual high spatial and high spectral images. After obtaining a detailed image, propagation over an ... -
A dual layer security scheme for medical images using Hessenberg and singular value decompositions
( Springer , 2022 , Article)Due to the recent advancement in the field of the Internet of Medical things (IoMT). To facilitate doctors and patients, in the process of diagnosis and treatment, the medical imaging equipment is connected to the IoMT. ... -
Hidden and Self-Excited Collective Dynamics of a New Multistable Hyper-Jerk System with Unique Equilibrium
(2022 , Article)Nonlinear dynamical systems with hidden attractors belong to a recent and hot area of research. Such systems can exist in different forms, such as without equilibrium or with a stable equilibrium point. This paper focuses ... -
A simple one-dimensional map-based model of spiking neurons with wide ranges of firing rates and complexities
( Elsevier , 2022 , Article)This paper introduces a simple 1-dimensional map-based model of spiking neurons. During the past decades, dynamical models of neurons have been used to investigate the biology of human nervous systems. The models simulate ... -
A Novel Highly Nonlinear Quadratic System: Impulsive Stabilization, Complexity Analysis, and Circuit Designing
( Hindawi , 2022 , Article)This work introduces a three-dimensional, highly nonlinear quadratic oscillator with no linear terms in its equations. Most of the quadratic ordinary differential equations (ODEs) such as Chen, Rossler, and Lorenz have at ... -
A Simple Conservative Chaotic Oscillator with Line of Equilibria: Bifurcation Plot, Basin Analysis, and Multistability
( Hindawi , 2022 , Article)Here, a novel conservative chaotic oscillator is presented. Various dynamics of the oscillator are examined. Studying the dynamical properties of the oscillator reveals its unique behaviors. The oscillator is multistable ... -
CGST: Provably Secure Lightweight Certificateless Group Signcryption Technique Based on Fractional Chaotic Maps
( Institute of Electrical and Electronics Engineers , 2022 , Article)In recent years, there has been a lot of research interest in analyzing chaotic constructions and their associated cryptographic structures. Compared with the essential combination of encryption and signature, the signcryption ... -
Multistable dynamics and control of a new 4D memristive chaotic Sprott B system
( Elsevier , 2022 , Article)This work proposes and investigates the dynamic behavior of a new memristive chaotic Sprott B system. One of the interesting features of this system is that it has a bias term that can adjust the symmetry of the proposed ... -
Developing, implementing and improving learning outcomes assessment in Qatar's public higher education
( Hamad bin Khalifa University Press (HBKU Press) , 2014 , Article)This study reports on the development and implementation of the Student Learning Outcomes Assessment process and the system implemented at Qatar University. This system consists of two phases, initiation and enhancement, ... -
Investigation on inlet obstruction in transitional flow regime: Heat transfer augmentation and pressure drop analysis
( Elsevier , 2022 , Article)Thermohydraulic characteristics of air as the working medium in a circular heated channel fitted with inlet obstruction (ribbed prism) at the inlet is carried out experimentally for transitional flow regime. The ribbed ... -
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 ...
