Browsing Mathematics, Statistics & Physics by Title

Now showing items 362-381 of 666

    • A Magnetic Transport Middle Eastern Positron Beam 

      Al-Qaradawi, I.Y.; Britton, D.T.; Rajaraman, R.; Abdulmalik, D. ( Elsevier , 2008 , Article)
      A magnetically guided slow positron beam is being constructed at Qatar University and is currently being optimised for regular operation. This is the first positron beam in the Middle East, as well as being the first Arabic ...

    • Majorana fermions in a box 

      Al-Hashimi, M.?H.; Shalaby, A.?M.; Wiese, U.-J. ( American Physical Society , 2017 , Article)
      Motivated by potential applications to ultracold matter, we perform a theoretical study of Majorana fermions confined to a finite volume, whose boundary conditions are characterized by self-adjoint extension parameters. ...

    • Mass problems and density 

      Binns, Stephen; Shore, Richard A.; Simpson, Stephen G. ( World Scientific Publishing Co. Pte Ltd , 2016 , Article)
      Recall that Ew is the lattice of Muchnik degrees of nonempty effectively compact sets in Euclidean space. We solve a long-standing open problem by proving that Ew is dense, i.e. satisfies {equation presented}. Our proof ...

    • Mathematical modeling of the SARSCoV-2 epidemic in Qatar and its impact on the national response to COVID-19 

      Ayoub, Houssein H.; Chemaitelly, Hiam; Seedat, Shaheen; Makhoul, Monia; Kanaani, Zaina Al; ... more authors ( University of Edinburgh , 2021 , Article)
      Background Mathematical modeling constitutes an important tool for planning robust responses to epidemics. This study was conducted to guide the Qatari national response to the severe acute respiratory syndrome coronavirus ...

    • The mathematical theory of finite and infinite dimensional topological spaces and its relevance to quantum gravity 

      Marek-Crnjac, L.; Iovane, G.; Nada, S.I.; Zhong, Ting ( Elsevier Ltd , 2009 , Article)
      The present work gives first a review of the mathematical theory of finite and infinite dimensional topological spaces. Subsequently we connect the discussion with E-infinity theory and the theory of partially ordered sets. ...

    • Maximum Likelihood Estimation in the Inverse Weibull Distribution with Type II Censored Data 

      Alshaikh, Fatima A.; Baklizi, Ayman ( Horizon Research Publishing , 2022 , Article)
      We consider maximum likelihood estimation for the parameters and certain functions of the parameters in the Inverse Weibull (IW) distribution based on type II censored data. The functions under consideration are the Mean ...

    • Measurements of the talus in the assessment of population affinity 

      Bidmos, M.; Bidmos, Mubarak A.; Dayal, Manisha R.; Adegboye, Oyelola A. ( Elsevier Ltd , 2018 , Article)
      © 2018 Elsevier B.V. As part of their routine work, forensic anthropologists are expected to report population affinity as part of the biological profile of an individual. The skull is the most widely used bone for the ...

    • Measuring skewness: We do not assume much 

      Khan, A.A.; Cheema, S.A.; Hussain, Z.; Abdel-Salam, G.A. ( Sharif University of Technology , 2021 , Article)
      Since skewness plays a vital role in different engineering phenomena, its accurate measurement gains significance. Several measures have been taken to quantify the extent of skewness in distributions over the years, but ...

    • Measuring the fall of antihydrogen: The AEGIS experiment at CERN 

      Doser, M.; Allkofer, Y.; Amsler, C.; Belov, A. S.; Bonomi, G.; ... more authors ( Elsevier B.V. , 2011 , Conference Paper)
      Considerable efforts have been made and are still being made to verify the validity of the principle of the equivalence of gravitational and inertial mass, one of the cornerstones of the classical theory of general relativity. ...

    • Metal/Metal-Oxide Nanoclusters for Gas Sensor Applications 

      Ayesh, Ahmad I. ( Hindawi Publishing Corporation , 2016 , Article Review)
      The development of gas sensors that are based on metal/metal-oxide nanoclusters has attracted intensive research interest in the last years. Nanoclusters are suitable candidates for gas sensor applications because of their ...

    • Microscale Thermal Energy Transfer Over a Combined System of Thin Films: Analytical Approach 

      Yilbas B.S.; Alassar R.S.M.; Mansoor S.B.; Al-Dweik A.Y. ( Taylor and Francis Inc. , 2019 , Article)
      An analytical approach for the solution of the equation for phonon transport is presented for the combination thin films system. The transient phonon radiative transport model is considered and the combination of the silicon ...

    • Microstructure of heat-treated steel probed by positron annihilation 

      Al-Qaradawi, I. Y.; Abdel-Hady, E. E.; Megahed, H. (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, ...

    • Mixed EWMA-CUSUM and mixed CUSUM-EWMA modified control charts for monitoring first order autoregressive processes 

      Osei-Aning, Richard; Abbasi, Saddam Akber; Riaz, Muhammad ( Taylor and Francis Ltd. , 2017 , Article)
      In practice most processes are known to produce autocorrelated observations. Autocorrelation degrades the performance of control charts by producing frequent false alarms when the process is stable or makes the charts ...

    • Model for oscillations in the guidance of ions through insulating nanocapillaries 

      Pokhil, G.; Merabet, H.; Stolterfoht, N. ( IOP Publishing , 2011 , Conference Paper)
      The pre-equilibrium period of the ion guiding through insulating nanocapillaries is characterized by the production of temporary charge patches inside the capillaries. The dynamics of the charge patch creation is revealed ...

    • Model predictive control of selective catalytic reduction in diesel-powered vehicles 

      Pakravesh, Hallas; Dubljevic, Stevan; Hayes, Robert E.; Forbes, J. Fraser; Aksikas, Ilyasse ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)
      This paper proposes a method to synthesize an optimal controller for the SCR section of the diesel exhaust after-treatment system, which is based on a system model consisting of coupled hyperbolic and parabolic partial ...

    • Model robust profile monitoring for the generalized linear mixed model for Phase I analysis 

      Bandara, Keerthi; Abdel-Salam, Abdel-Salam G.; Birch, Jeffrey B. ( 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, ...

    • Model-based optimal boundary control of selective catalytic reduction in diesel-powered vehicles 

      Aksikas A.; Aksikas I.; Hayes R.E.; Forbes J.F. ( Elsevier Ltd , 2018 , Article)
      This paper is devoted to design a model-based boundary optimal controller for selective catalytic reduction system. The mathematical model consists of coupled parabolic-hyperbolic PDEs with an ODE. The main objective is ...

    • Modeling the population-level impact of treatment on COVID-19 disease and SARS-CoV-2 transmission 

      Monia, Makhoul; Abu-Hijleh, Farah; Ayoub, Houssein H.; Seedat, Shaheen; Chemaitelly, Hiam; ... more authors ( 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 ...

    • The modified homotopy perturbation method for solving strongly nonlinear oscillators 

      Momani, Shaher; Erjaee, G.H.; Alnasr, M.H. ( Elsevier , 2009 , Article)
      In this paper we propose a reliable algorithm for the solution of nonlinear oscillators. Our algorithm is based upon the homotopy perturbation method (HPM), Laplace transforms, and Padé approximants. This modified homotopy ...

    • Modified Profile Likelihood Estimation in the Lomax Distribution 

      Sewailem, Maisoun; Baklizi, Ayman ( 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 ...