Mathematics, Statistics & Physics: Recent submissions
Now showing items 561-580 of 728
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Invariant characterization of scalar third-order ODEs that admit the maximal point symmetry Lie algebra
( John Wiley and Sons Ltd , 2018 , Article)The Cartan equivalence method is used to deduce an invariant characterization of the scalar third-order ordinary differential equation u"' = f(x, u, u', u"), which admits the maximal 7-dimensional point symmetry Lie algebra. ... -
A note on the Ramsey numbers for theta graphs versus the wheel of order 5
( Kalasalingam University , 2018 , Article)The study of exact values and bounds on the Ramsey numbers of graphs forms an important family of problems in the extremal graph theory. For a set of graphs S and a graph F, the Ramsey number R(S,F) is the smallest positive ... -
Association between Soft Drink Consumption and Aggressive Behaviour among a Quarter Million Adolescents from 64 Countries Based on the Global School-Based Student Health Survey (GSHS)
( MDPI , 2020 , Article)Soft drink consumption has become a significant public health concern that is associated with various adverse health outcomes.We aim to examine the association between soft drink consumption and aggressive behavior among ... -
Doped conductive polymers and single-walled carbon nanotubes as charge storage devices
( Institute of Physics Publishing , 2018 , Article)Single-walled carbon nanotubes (SWCNTs), introduced as nano-fillers, were used as charge storage elements. Organic semiconducting polymers were produced by doping organic plasticizers with nonconductive polymers. The ... -
Statistical estimate of radon concentration from passive and active detectors in Doha
( MDPI AG , 2018 , Article)Harnessing knowledge on the physical and natural conditions that affect our health, general livelihood and sustainability has long been at the core of scientific research. Health risks of ionising radiation from exposure ... -
A comparative study of chemically reacting 2D flow of Casson and Maxwell fluids
( Elsevier B.V. , 2018 , Article)Theoretical investigation is performed to discuss the heat and mass transfer behavior of chemically reacting magnetohydrodynamic Casson and Maxwell fluids past a stretching sheet with Brownian moment and thermophoresis ... -
A one-step implicit iterative method for two finite families of asymptotically nonexpansive mappings in a hyperbolic space
( Springer Verlag , 2018 , Article)We introduce a one-step implicit iterative method for two finite families of asymptotically nonexpansive mappings in a hyperbolic space and use it to approximate common fixed points of these families. The results presented ... -
Morphology and property changes in PLA/PHBV blends as function of blend composition
( Springer Netherlands , 2018 , Article)PLA/PHBV blends were prepared by melt mixing. The morphology and physical properties of the blends and neat polymers were investigated. Scanning electron microscopy (SEM) studies provided evidence of interfacial cavities ... -
Hepatitis C virus infection spontaneous clearance: Has it been underestimated?
( Elsevier B.V. , 2018 , Article)Objectives: Hepatitis C virus (HCV) clearance rate (fclearance) is defined as the proportion of infected persons who will spontaneously clear their infection after acute infection. We aimed to estimate fclearance using a ... -
Approximating the tail probabilities of the longest run in a sequence of Bernoulli trials
( Taylor and Francis Ltd. , 2018 , Article)We consider the longest run of either successes or failures in a sequence of (Formula presented.) Bernoulli trials. The exact distribution of this random variable is obtained using probability generating function techniques. ... -
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, ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ...