Mathematics, Statistics & Physics: Recent submissions
Now showing items 581-600 of 738
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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 ... -
Numerical Conformal Mapping onto the Parabolic, Elliptic and Hyperbolic Slit Domains
( Springer , 2018 , Article)This paper presents a numerical method for computing the conformal mappings onto the parabolic slit domain, the elliptic slit domain and the hyperbolic slit domain. The method relies on a boundary integral equation with ... -
Selective gas sensors using graphene and CuO nanorods
( Elsevier B.V. , 2018 , Article)This work reports on the fabrication of sensitive and selective gas sensors fabricated using graphene and/or copper oxide (CuO) nanorods. Herein, three batches of sensors were produced based on graphene/SiO2/Si, CuO nanorods, ... -
Model-based optimal boundary control of selective catalytic reduction in diesel-powered vehicles
( 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 ... -
Multivariate coefficient of variation control charts in phase I of SPC
( Springer London , 2018 , Article)Multivariate control charts are mostly available for monitoring the process mean vector or the covariance matrix. Recently, work has been done on monitoring the multivariate coefficient of variation (CV) in phase II of the ... -
Noise pollution in the hospital environment of a developing country: A case study of Lahore (Pakistan)
( Taylor and Francis Inc. , 2018 , Article)The present study investigates the noise pollution levels in public- and private-sector hospitals of Lahore. The noise pollution parameters were investigated from 20 public and 10 private hospitals. We observed that the ... -
Interval estimation of quantile difference in the two-parameter exponential distributions
( ASTM International , 2018 , Article)We consider the interval estimation of the difference between the quantiles of two random variables with independent two-parameter exponential distributions based on Type II censored data. We derive asymptotic intervals ... -
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 ... -
Green synthesis of metallic nanoparticles using biopolymers and plant extracts
( wiley , 2018 , Book chapter)Over the last few decads, the metal nanoparticles (MNPs) have been extensively studied because of their attractive optical and electronic properties related to the quantum size effect in addition to their promising ... -
A boundary integral method for the general conjugation problem in multiply connected circle domains
( Springer International Publishing , 2018 , Article)We present a boundary integral method for solving a certain class of Riemann-Hilbert problems known as the general conjugation problem. The method is based on a uniquely solvable boundary integral equation with the generalized ... -
Statistical analysis for the impact of smoking on the behavior and health of Qatari adolescents
( De Gruyter , 2018 , Article)The links between the use of tobacco and health risks are well known. Most of the younger smokers reside in Asia which includes Qatar, the focus country of this study. Cigarette smoking among children is rising at an ... -
Artificial Neural Network versus Linear Models Forecasting Doha Stock Market
( Institute of Physics Publishing , 2018 , Conference Paper)The purpose of this study is to determine the instability of Doha stock market and develop forecasting models. Linear time series models are used and compared with a nonlinear Artificial Neural Network (ANN) namely Multilayer ... -
Bright breathers in nonlinear left-handed metamaterial lattices
( Institute of Physics Publishing , 2018 , Article)In the present work, we examine a prototypical model for the formation of bright breathers in nonlinear left-handed metamaterial lattices. Utilizing the paradigm of nonlinear transmission lines, we build a relevant lattice ... -
Parametric Model Based on Imputations Techniques for Partly Interval Censored Data
( Institute of Physics Publishing , 2018 , Conference Paper)The term 'survival analysis' has been used in a broad sense to describe collection of statistical procedures for data analysis. In this case, outcome variable of interest is time until an event occurs where the time to ... -
Classification of the Lie and Noether point symmetries for the Wave and the Klein–Gordon equations in pp-wave spacetimes
( Elsevier B.V. , 2018 , Article)A complete classification of the Lie and Noether point symmetries for the Klein–Gordon and the wave equation in pp-wave spacetimes is obtained. The classification analysis is carried out by reducing the problem of the ... -
Analysis of spatial data with a nested correlation structure
( Blackwell Publishing Ltd , 2018 , Article)Spatial statistical analyses are often used to study the link between environmental factors and the incidence of diseases. In modelling spatial data, the existence of spatial correlation between observations must be ... -
SU (5) with nonuniversal gaugino masses
( World Scientific Publishing Co. Pte Ltd , 2018 , Article)We explore the sparticle spectroscopy of the supersymmetric SU(5) model with nonuniversal gaugino masses in light of latest experimental searches. We assume that the gaugino mass parameters are independent at the GUT scale. ... -
Boundary linear-quadratic control for a system of coupled parabolic-hyperbolic PDEs and ODE
( Institute of Electrical and Electronics Engineers Inc. , 2018 , Conference Paper)The paper deals with the design of a boundary optimal controller for a general model of parabolic-hyperbolic PDEs coupled with an ODE. The augmented infinite-dimensional state space representation has been used in order ... -
A fast numerical method for ideal fluid flow in domains with multiple stirrers
( Institute of Physics Publishing , 2018 , Article)A collection of arbitrarily-shaped solid objects, each moving at a constant speed, can be used to mix or stir ideal fluid, and can give rise to interesting flow patterns. Assuming these systems of fluid stirrers are ... -
Estimation of common location parameter of two exponential populations based on records
( Taylor and Francis Inc. , 2018 , Article)Consider the problem of estimating the common location parameter of two exponential populations using record data when the scale parameters are unknown. We derive the maximum likelihood estimator (MLE), the modified maximum ...
