Browsing Mathematics, Statistics & Physics by Title
Now showing items 491-510 of 689
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On the numerical simulation of population dynamics with density-dependent migrations and the Allee effects
( IOP Publishing , 2008 , Article)In this paper, the variational iteration method (VIM) and the Adomian decomposition method (ADM) are presented for the numerical simulation of the population dynamics model with density-dependent migrations and the Allee ... -
On the origins of antiferromagnetic order in a frustrated spin system at high pressure
( National Academy of Sciences , 2015 , Article)In this letter, I would like to complement the discussion on the antiferromagnetic (AFM) order in the model-frustrated quantum magnet SrCu2(BO3)2 at high pressure. -
On the performance of coefficient of variation control charts in Phase I
( John Wiley and Sons Ltd , 2018 , Article)Control charts are mainly carried out in 2 interconnected phases: Phase I (retrospective phase) and Phase II (monitoring phase). Phase I uses a stable historical sample to establish control limits that will be used later ... -
On the preparation of electron sensor using LiRbSO4 samples
( WILEY-VCH Verlag GmbH & Co. , 2005 , Article)The dielectric spectroscopy of metal�metal sulfate LiRbSO4 samples are described with particular emphasis on sensor performance to be used in the field of radiation. The obtained results as the effect of different electron ... -
On the Valence State of Iron in Sr0.52+Ca0.52+Fe0.54+ Me0.54+O32−
( WILEY-VCH Verlag GmbH & Co. , 1989 , Article)Powder samples of Sr0.5Ca0.5Fe0.5Me0.5O3 (Me = Co, Zr or Mn) and Sr0.3La0.7FeO3 are investigated by X-ray diffraction and Mossbauer effect spectroscopy. Analysis of the completely ordered spectra suggested three kinds ... -
On Thermal Distribution for Darcy-Forchheimer Flow of Maxwell Sutterby Nanofluids over a Radiated Extending Surface
( MDPI , 2022 , Article)This study addresses thermal transportation associated with dissipated flow of a Maxwell Sutterby nanofluid caused by an elongating surface. The fluid passes across Darcy-Forchheimer sponge medium and it is affected by ... -
On Time-Dependent Rheology of Sutterby Nanofluid Transport across a Rotating Cone with Anisotropic Slip Constraints and Bioconvection
( MDPI , 2022 , Article)The purpose and novelty of our study include the scrutinization of the unsteady flow and heat characteristics of the unsteady Sutterby nano-fluid flow across an elongated cone using slip boundary conditions. The bioconvection ... -
On Transformations and Perturbations of Orthogonal r-Frames
( WILEY-VCH Verlag GmbH & Co. , 1993 , Article)A decomposition of Cn into a finite direct sum of orthogonal subspaces can be conveniently represented by its orthogonal projector frame, which is the collection of the corresponding orthogonal projectors. Two such ... -
One and two sample confidence intervals for estimating the mean of skewed populations: an empirical comparative study
( TAYLOR & FRANCIS LTD , 2009 , Article)In this paper we consider and propose some confidence intervals for estimating the mean or difference of means of skewed populations. We extend the median t interval to the two sample problem. Further, we suggest using the ... -
One-Sided and Two One-Sided Multivariate Homogeneously Weighted Moving Charts for Monitoring Process Mean
( Institute of Electrical and Electronics Engineers Inc. , 2021 , Article)Multivariate memory-type control charts that use information from both the current and previous process observations have been proposed. They are designed to detect shifts in both upper and downward directions with equal ... -
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 ... -
Optical fluorescent spider silk electrospun nanofibers with embedded cerium oxide nanoparticles
( SPIE , 2018 , Article)The work demonstrates an electrospun nanocomposite of recombinant spider silk protein (rSSp) nanofibers with embedded cerium oxide (ceria) nanoparticles. RSSP (MaSp1) has been produced, extracted from goat milk, and ... -
Optimal Boundary Control for Selective Catalytic Reduction Distributed Parameter Model
( Elsevier B.V. , 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 ... -
Optimal boundary control of coupled parabolic PDE-ODE systems using infinite-dimensional representation
( Elsevier , 2015 , Article)The optimal boundary control problem is studied for coupled parabolic PDE-ODE systems. The linear quadratic method is used and exploits an infinite-dimensional state-space representation of the coupled PDE-ODE system. ... -
Optimal control and duality-based observer design for a hyperbolic PDEs system with application to fixed-bed reactor
( Taylor and Francis Ltd. , 2021 , Article)This paper is devoted to the design of an optimal infinite-dimensional Luenberger observer combined with a linear-quadratic state feedback controller for a system of hyperbolic PDEs. The design is based on the duality fact ... -
Optimal control of a time-varying system of coupled parabolic-hyperbolic PDEs
( IEEE Computer Society , 2017 , Conference Paper)This paper is devoted to design an optimal linear quadratic controller for a time-varying system of coupled parabolic and hyperbolic partial differential equations (PDEs). Infinite-dimensional state space approach is adopted ... -
Optimal control of an advection-dominated catalytic fixed-bed reactor with catalyst deactivation
( Elsevier , 2013 , Article)The paper focuses on the linear-quadratic control problem for a time-varying partial differential equation model of a catalytic fixed-bed reactor. The classical Riccati equation approach, for time-varying infinite-dimensional ... -
Optimal control of coupled parabolic–hyperbolic non-autonomous PDEs: infinite-dimensional state-space approach
( Taylor and Francis Ltd. , 2018 , Article)This paper deals with the design of an optimal state-feedback linear-quadratic (LQ) controller for a system of coupled parabolic–hypebolic non-autonomous partial differential equations (PDEs). The infinite-dimensional state ... -
Optimal linear–quadratic control of coupled parabolic–hyperbolic PDEs
( Taylor and Francis Ltd. , 2017 , Article)This paper focuses on the optimal control design for a system of coupled parabolic-hypebolic partial differential equations by using the infinite-dimensional state-space description and the corresponding operator Riccati ... -
Optimal output-feedback temperature regulation of a catalytic reverse flow reactor PDEs model
( Elsevier , 2021 , Article)In this work, control and estimation problems have been studied for a catalytic reversal flow reactor (CFRR). A stabilizing compensator is developed on the basis of the infinite-dimensional state-space description of the ...