Mathematics, Statistics & Physics: Recent submissions

Now showing items 481-500 of 814

    • Association of Prior SARS-CoV-2 Infection With Risk of Breakthrough Infection Following mRNA Vaccination in Qatar. 

      Abu-Raddad, Laith J; Chemaitelly, Hiam; Ayoub, Houssein H; Yassine, Hadi M; Benslimane, Fatiha M; ... more authors ( American Medical Association , 2021 , Article)
      The effect of prior SARS-CoV-2 infection on vaccine protection remains poorly understood. To assess protection from SARS-CoV-2 breakthrough infection after mRNA vaccination among persons with vs without prior SARS-CoV-2 ...

    • BNT162b2 and mRNA-1273 COVID-19 vaccine effectiveness against the SARS-CoV-2 Delta variant in Qatar. 

      Tang, Patrick; Hasan, Mohammad R; Chemaitelly, Hiam; Yassine, Hadi M; Benslimane, Fatiha M; ... more authors ( Nature Researc , 2021 , Article)
      With the global expansion of the highly transmissible SARS-CoV-2 Delta (B.1.617.2) variant, we conducted a matched test-negative case-control study to assess the real-world effectiveness of COVID-19 messenger RNA vaccines ...

    • Epidemiological impact of prioritising SARS-CoV-2 vaccination by antibody status: Mathematical modelling analyses 

      Ayoub, H.H.; Ayoub, Houssein H.; Chemaitelly, Hiam; Makhoul, Monia; Al Kanaani, Zaina; ... more authors ( BMJ Publishing Group , 2021 , Article)
      Background Vaccines against SARS-CoV-2 have been developed, but their availability falls far short of global needs. This study aimed to investigate the impact of prioritising available doses on the basis of recipient ...

    • SARS-CoV-2 antibody-positivity protects against reinfection for at least seven months with 95% efficacy 

      Laith J., Abu-Raddad; Chemaitelly, Hiam; Coyle, Peter; Malek, Joel A.; Ahmed, Ayeda A.; ... more authors ( Elsevier , 2021 , Article)
      Background Reinfection with the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been documented, raising public health concerns. SARS-CoV-2 reinfections were assessed in a cohort of antibody-positive persons ...

    • mRNA-1273 COVID-19 vaccine effectiveness against the B.1.1.7 and B.1.351 variants and severe COVID-19 disease in Qatar 

      Chemaitelly, Hiam; Yassine, Hadi M.; Benslimane, Fatiha M.; Al Khatib, Hebah A.; Tang, Patrick; ... more authors (2021 , Article)
      The SARS-CoV-2 pandemic continues to be a global health concern. The mRNA-1273 (Moderna) vaccine was reported to have an efficacy of 94.1% at preventing symptomatic COVID-19 due to infection with ‘wild-type’ variants in a ...

    • Bayesian inference for Pr ( Y<X ) in the exponential distribution based on records 

      Baklizi, Ayman ( Elsevier , 2014 , Article)
      We consider Bayesian estimation of the stress–strength reliability based on record values. The estimators are derived under the squared error loss function in the one parameter as well as two-parameter exponential ...

    • Multi-soliton solutions of the BBM equation arisen in shallow water 

      Alsayyed, O.; Jaradat, H. M.; Jaradat, M. M.M.; Mustafa, Zead ( International Scientific Research Publications , 2016 , Article)
      In this work, multiple soliton solutions and multiple singular soliton solutions are formally derived for the BBM equation. A novel transformation method combined with the Hirota's bilinear method are used to determine the ...

    • New solitary wave and multiple soliton solutions for the time-space coupled fractional mKdV system with time-dependent coefficients 

      Jaradat, H. M; Al-Shara', Safwan; Jaradat, M. M. M; Mustafa, Zead; Alsayyed, O; ... more authors ( American Scientific Publishers , 2016 , Article)
      In this paper, a simplified bilinear method combined with a fractional transform has been used to obtain new multiple soliton solutions for the Fractional coupled modified KdV systems with variable coefficients. These ...

    • Selective hydrogen gas sensor using CuFe 2 O 4 nanoparticle based thin film 

      Haija, Mohammad Abu; Ayesh, Ahmad I.; Ahmed, Sadiqa; Katsiotis, Marios S. ( Elsevier B.V. , 2016 , Article)
      Hydrogen gas sensors based on CuFe2O4 nanoparticle thin films are presented in this work. Each gas sensor was prepared by depositing CuFe2O4 thin film on a glass substrate by dc sputtering inside a high vacuum chamber. ...

    • A new numerical method for heat equation subject to integral specifications 

      Jaradat, H. M.; Jaradat, M. M. M.; Awawdeh, F.; Mustafa, Z.; Alsayyed, O. ( International Scientific Research Publications , 2016 , Article)
      We develop a numerical technique for solving the one-dimensional heat equation that combine classical and integral boundary conditions. The combined Laplace transform, high-precision quadrature schemes, and Stehfest inversion ...

    • Stagnation point flow study with water based nanoparticles aggregation over a stretching sheet: numerical solution 

      Akbar, Noreen Sher; Mustafa, M. T.; Khan, Zafar Hayat ( American Scientific Publishers , 2016 , Article)
      Intention of the current study is to examined the two dimensional stagnation point flow of waterbased nanofluid towards a stretching sheet. To simplify the problem similarity transformations are smearing on basic boundary ...

    • Some common fixed point results of graphs on b-metric space 

      Mustafa, Zead; Jaradat, Husein M.; Jaradat, M. ( International Scientific Research Publications , 2016 , Article)
      The aim of this paper is to present some coincidence point results and common fixed points for pair of self-mappings satisfying generalized contractive condition in the framework of b-metric spaces endowed with a graph. ...

    • Enhancing passive UHF RFID backscatter energy using chirp spread spectrum signals and channel shortening 

      Ben-Jabeur, Taoufik; Kadri, Abdullah; Hazaa, Khalifa Abdulla ( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference)
      Performance of passive ultrahigh frequency radio-frequency identification (UHF RFID) systems depends on the energy level of the backscattered signal from the RF tag to the RFID reader. In the indoor environment, the ...

    • A strongly secure certificateless digital signature scheme in the random oracle model 

      Hassouna, Mohammed; Bashier, Eihab; Barry, Bazara ( Femto Technique Co., Ltd. , 2016 , Article)
      The main purpose of this paper is to provide a security proof for the certificateless digital signature scheme found in [Hassouna, Bashier, and Barry, A short certificateless digital signature scheme, International Conference ...

    • Bioinformatic analysis of human opn3 alternative promoters associated with cancer 

      Ibrahim Al-Obaide, Mohammed A.; Abdel-Salam, Abdel Salam G.; Alobydi, Hytham; Srivenugopal, Kalkunte S. ( Natural Sciences Publishing Co. , 2016 , Article)
      In this bioinformatics study we analyzed the functional motifs and structural features of regulatory regions of OPN3, a member of the guanine nucleotide-binding protein (G protein)-coupled receptor super-family, which is ...

    • An algorithm approach to maximal monotone operators and pseudo-contractions 

      Zhu, Xinhe; Yao, Zhangsong; Hamdi, Abdelouahed ( International Scientific Research Publications , 2016 , Article)
      The purpose of this article is to find the minimum norm solution of maximal monotone operators and strict pseudo-contractions in Hilbert spaces. A parallel algorithm is constructed. Some analysis techniques are used to ...

    • Logarithmic Bounds for Oscillatory Singular Integrals on Hardy Spaces 

      Al-Qassem, Hussain; Cheng, Leslie; Pan, Yibiao ( Hindawi Publishing Corporation , 2016 , Article)
      We establish a logarithmic bound for oscillatory singular integrals with quadratic phases on the Hardy space H 1 (R n). The logarithmic rate of growth is the best possible. 2016 Hussain Al-Qassem et al.

    • Weak and strong convergence theorems for generalized nonexpansive mappings 

      Khan, Safeer Hussain; Karahan, Ibrahim ( Universitatii Al.I.Cuza din Iasi , 2016 , Article)
      We consider a class of generalized nonexpansive mappings introduced by Karapinar and seen as a generalization of Suzuki (C)-condition. We prove some weak and strong convergence theorems for approximating fixed points of ...

    • Estimation procedures based on preliminary test in exponential distribution under progressive censoring 

      Baklizi, A.; Asgharzadeh, A.; Sharifi, M. ( Nova Science Publishers, Inc. , 2016 , Article)
      This paper considers the preliminary test estimator of the unknown parameter of the exponential distribution based on progressively Type-II censored samples. The mean squared error of the proposed estimator is derived and ...

    • Axisymmetric Powell-Eyring fluid flow with convective boundary condition: optimal analysis 

      Hayat, T.; Makhdoom, S.; Awais, M.; Saleem, S.; Rashidi, M. M. ( Springer Netherlands , 2016 , Article)
      The effects of axisymmetric flow of a Powell-Eyring fluid over an impermeable radially stretching surface are presented. Characteristics of the heat transfer process are analyzed with a more realistic condition named the ...