Mathematics, Statistics & Physics: Recent submissions
Now showing items 661-680 of 804
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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)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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Shrinkage estimates of covariance matrices to improve the performance of multivariate cumulative sum control charts
( Elsevier Ltd , 2018 , Article)Multivariate cumulative sum control charts require knowledge of the in-control process covariance parameters. Here, we show that the performance of the multivariate cumulative sum control charts for individual-observation ... -
New solitary wave and multiple soliton solutions for fifth order nonlinear evolution equation with time variable coefficients
( Elsevier B.V. , 2018 , Article)In this paper, we investigate the multiple soliton solutions and multiple singular soliton solutions of a class of the fifth order nonlinear evolution equation with variable coefficients of t using the simplified bilinear ... -
Design, fabrication, and characterization of Hg2+ sensor based on graphite oxide and metallic nanoclusters
( Elsevier B.V. , 2018 , Article)In this paper, sensors with field-effect transistor structure have been developed to detect low concentration of mercury ions (Hg2+) in water. These sensors are based on graphite oxide decorated with silver nanoclusters, ... -
T-tetrominoes tiling's Markov chain mixes fast
( Elsevier B.V. , 2018 , Article)Korn and Pak (2007) [3] conjectured that there exists a fully polynomial randomized approximation scheme (fpras) for approximating the number of ways of tiling a 4n x 4m rectangular lattice with T-tetrominoes. Using a flow ... -
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 ... -
Linearization of third-order ordinary differential equations u'''=f(x,u,u',u') via point transformations
( John Wiley and Sons Ltd , 2018 , Article)The linearization problem for scalar third-order ordinary differential equations via point transformations was solved partially in the works of Al-Dweik et al by the use of the Cartan equivalence method. In order to solve ... -
The Ramsey number for two graphs of order 5
( Taylor and Francis Ltd. , 2018 , Article)For two graphs F1 and F2, the Ramsey number R(F1, F2) is the smallest positive integer r such that for every graph G on r vertices, G contains F1 as a subgraph or the complement of G contains F2 as a subgraph. We present ... -
Graphene-based nanopore approaches for DNA sequencing: A literature review
( Elsevier Ltd , 2018 , Article Review)DNA (deoxyribonucleic acid) is the blueprint of life as it encodes all genetic information. In genetic disorder such as gene fusion, copy number variation (CNV) and single nucleotide polymorphism, DNA sequencing is used ... -
Embedding algorithms and applications to differential equations
( Academic Press , 2018 , Article)Algorithms for embedding certain types of nilpotent subalgebras in maximal subalgebras of the same type are developed, using methods of real algebraic groups. These algorithms are applied to determine non-conjugate subalgebras ... -
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 ... -
Size-selected fabrication of alloy nanoclusters by plasma-gas condensation
( Elsevier Ltd , 2018 , Article)This work reports on the production of alloy Ti-Cu nanoclusters by magnetron sputtering and plasma-gas condensation inside an ultra-high compatible system. Inert-gas was introduced inside a source chamber to generate plasma, ... -
On the nonexistence of degenerate phase-shift discrete solitons in a dNLS nonlocal lattice
( Elsevier B.V. , 2018 , Article)We consider a one-dimensional discrete nonlinear Schrdinger (dNLS) model featuring interactions beyond nearest neighbors. We are interested in the existence (or nonexistence) of phase-shift discrete solitons, which correspond ... -
On generalized Littlewood–Paley functions
( Springer-Verlag Italia s.r.l. , 2018 , Article)We study the Lp boundedness of certain classes of generalized Littlewood–Paley functions S(f). We obtain Lp estimates of S(f) with sharp range of p and under optimal conditions on ?. By using these estimates along with an ... -
Iterative approximation of common attractive points of further generalized hybrid mappings
( SpringerInternationalPublishing , 2018 , Article)Our purpose in this paper is (i) to introduce the concept of further generalized hybrid mappings, (ii) to introduce the concept of common attractive points (CAP), and (iii) to write and use Picard-Mann iterative process ...
