Browsing Mathematics, Statistics & Physics by Title

Now showing items 205-224 of 689

    • Effect of mRNA Vaccine Boosters against SARS-CoV-2 Omicron Infection in Qatar. 

      Abu-Raddad, Laith J; Chemaitelly, Hiam; Ayoub, Houssein H; AlMukdad, Sawsan; Yassine, Hadi M; ... more authors ( Massachusetts Medical Society , 2022 , Article)
      Waning of vaccine protection against coronavirus disease 2019 (Covid-19) and the emergence of the omicron (or B.1.1.529) variant of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have led to expedited ...

    • Effect of Zn and Ni substitution on structural, morphological and magnetic properties of tin oxide nanoparticles 

      Bhuvana, S.; Ramalingam, H.B.; Vadivel, K.; Kumar, E. Ranjith; Ayesh, Ahmad I. ( Elsevier , 2016 , Article)
      Structural, morphological, optical and magnetic properties of Zn and Zn–Ni co-doped tin oxide (SnO2) nanoparticles synthesized by sol-gel method. The influence of doping concentration on phase and particle size of the ...

    • Effective action study of the PT-symmetric (iϕ3)6−ϵ theory and the Yang–Lee edge singularity 

      Shalaby, Abouzeid M. ( World Scientific Publishing Co. Pte Ltd , 2019 , Article)
      We use the effective potential method to study the PT-symmetric iϕ3 field theory in 6−ϵ space–time dimensions. For ϵ=0, we obtained the first two energy levels which are real as well as reflecting the stability of the ...

    • Effectiveness of two and three doses of COVID-19 mRNA vaccines against infection, symptoms, and severity in the pre-omicron era: A time-dependent gradient 

      Layan, Sukik; Chemaitelly, Hiam; Ayoub, Houssein H.; Coyle, Peter; Tang, Patrick; ... more authors ( Elsevier , 2024 , Article)
      BackgroundVaccines were developed and deployed to combat severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. This study aimed to characterize patterns in the protection provided by the BNT162b2 and ...

    • Effects of ambient climate and three warming treatments on fruit production in an alpine, subarctic meadow community 

      Alatalo, Juha M.; Jägerbrand, Annika K.; Dai, Junhu; Mollazehi, Mohammad D.; Abdel-Salam, Abdel-Salam G.; ... more authors ( Wiley , 2021 , Article)
      Premise Climate change is having major impacts on alpine and arctic regions, and inter‐annual variations in temperature are likely to increase. How increased climate variability will impact plant reproduction is ...

    • Effects of BA.1/BA.2 subvariant, vaccination, and prior infection on infectiousness of SARS-CoV-2 omicron infections. 

      Qassim, Suelen H; Chemaitelly, Hiam; Ayoub, Houssein H; AlMukdad, Sawsan; Tang, Patrick; ... more authors ( 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 ...

    • The effects of ion bombardment of ultra-high molecular weight polyethylene 

      A., Turos; Abdul-Kader, A.M.; Grambole, D.; Jagielski, J.; Piątkowska, A.; ... more authors ( Elsevier , 2006 , Article)
      Ion bombardment is a suitable tool to improve tribological properties of polymers. In this study UHMWPE samples were bombarded with 130keV He ions to the fluences ranging from 1×1014 to 2×1016cm−2. RBS and NRA techniques ...

    • Effects of Previous Infection and Vaccination on Symptomatic Omicron Infections. 

      Altarawneh, Heba N; Chemaitelly, Hiam; Ayoub, Houssein H; Tang, Patrick; Hasan, Mohammad R; ... more authors ( Massachusetts Medical Society , 2022 , Article)
      The protection conferred by natural immunity, vaccination, and both against symptomatic severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection with the BA.1 or BA.2 sublineages of the omicron (B.1.1.529) ...

    • Effects of previous infection, vaccination, and hybrid immunity against symptomatic Alpha, Beta, and Delta SARS-CoV-2 infections: an observational study 

      Heba N., Altarawneh; Chemaitelly, Hiam; Ayoub, Houssein H.; Tang, Patrick; Hasan, Mohammad R.; ... more authors ( Elsevier , 2023 , Article)
      BackgroundProtection against SARS-CoV-2 symptomatic infection and severe COVID-19 of previous infection, mRNA two-dose vaccination, mRNA three-dose vaccination, and hybrid immunity of previous infection and vaccination ...

    • Effects of SARS-CoV-2 Alpha, Beta, and Delta variants, age, vaccination, and prior infection on infectiousness of SARS-CoV-2 infections 

      Qassim, Suelen H.; Hasan, Mohammad R.; Tang, Patrick; Chemaitelly, Hiam; Ayoub, Houssein H.; ... more authors ( Frontiers Media , 2022 , Article)
      In 2021, Qatar experienced considerable incidence of SARS-CoV-2 infection that was dominated sequentially by the Alpha, Beta, and Delta variants. Using the cycle threshold (Ct) value of an RT-qPCR-positive test to proxy ...

    • Effects of time-lagged meteorological variables on attributable risk of leishmaniasis in central region of Afghanistan 

      Adegboye M.A.; Olumoh J.; Saffary T.; Elfaki F.; Adegboye O.A. ( Elsevier B.V. , 2019 , Article)
      Background Leishmaniasis remains one of the world's most neglected vector-borne diseases, affecting predominantly poor communities mainly in developing countries. Previous studies have shown that the distribution and ...

    • An Efficient Audio Encryption Scheme Based on Finite Fields 

      Shah, Dawood; Shah, Tariq; Hazzazi, Muhammad Mazyad; Haider, Muhammad Imran; Aljaedi, Amer; ... more authors ( IEEE , 2021 , Article)
      Finite fields are well-studied algebraic structures with enormous efficient properties which have applications in the fields of cryptology and coding theory. In this study, we proposed a lossless binary Galois field ...

    • Efficient bivariate EWMA charts for monitoring process dispersion 

      Osei-Aning, Richard; Abbasi, Saddam Akber ( John Wiley and Sons Ltd , 2020 , Article)
      To ensure high quality standards of a process, the application of control charts to monitor process performance has become a regular routine. Multivariate charts are a preferred choice in the presence of more than one ...

    • Efficient control charts for monitoring process CV using auxiliary information 

      Abbasi, Saddam Akbar ( Institute of Electrical and Electronics Engineers Inc. , 2020 , Article)
      Coefficient of variation (CV) control charts are a suitable choice for the monitoring of variation in cases when the process standard deviation is proportional to the process mean. This study is aimed at enhancing the ...

    • Efficient cv control charts based on ranked set sampling 

      Abbasi, Saddam Akber; Abbas, Tahir; Adegoke, Nurudeen Adedayo ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Article)
      Monitoring process variability is essential for establishing efficient process-control schemes. In practice, when the mean levels of a parameter are constant, and the process variance (or standard deviation) is independent ...

    • An efficient dynamical systems method for solving singularly perturbed integral equations with noise 

      Sweilam, N.H.; Nagy, A.M.; Alnasr, M.H. ( Elsevier , 2009 , Article)
      In this paper we apply the dynamical systems method (DSM) proposed by A. G. Ramm, and the variational regularization method (VRM), to obtain numerical solution to some singularly perturbed ill-posed problems contaminated ...

    • Efficient GLM-based control charts for Poisson processes 

      Mahmood, Tahir; Iqbal, Anam; Abbasi, Saddam Akber; Amin, Muhammad ( John Wiley & Sons, Ltd , 2022 , Article)
      The control charts are essential instruments that can impart crucial insights to quality controllers for maintaining the productivity of manufacturing processes. The conventional charting designs are based on a single study ...

    • Efficient homogeneously weighted dispersion control charts with an application to distillation process 

      Abbasi, Saddam Akber; Nassar, Sara Hussam; Aldosari, Mashael Mohammed; Adeoti, Olatunde A. ( Wiley , 2021 , Article)
      Monitoring disturbances in process dispersion using control chart is mostly based on the assumption that the quality characteristic follows normal distribution, which is not the case in many real-life situations. This paper ...

    • Efficient linear profile schemes for monitoring bivariate correlated processes with applications in the pharmaceutical industry 

      Dawod, Abdaljbbar B.A.; Adegoke, Nurudeen A.; Abbasi, Saddam Akbar ( Elsevier , 2020 , Article)
      The complexity of chemical processes warrants that collection of information about the processes will continue as they proceed through the various stages of industrialization. Process monitoring has emerged as an essential ...

    • Efficient monitoring of coefficient of variation with an application to chemical reactor process 

      Mahmood, Tahir; Abbasi, Saddam Akber ( John Wiley and Sons Ltd , 2021 , Article)
      Control chart is a useful tool to monitor the performance of the industrial or production processes. Control charts are mostly adopted to detect unfavorable variations in process location (mean) and dispersion (standard ...