Browsing Mathematics, Statistics, and Physics by Title
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Effect of gallium additions on reduction, carburization and FischerTropsch activity of iron catalysts
(Springer US, 201807)Undoped and galliumdoped iron oxide catalysts (100Fe, 100Fe:2Ga, and 100Fe:5Ga) were prepared by following a continuous coprecipitation technique using ammonium hydroxide as precipitant. The catalysts were characterized ... 
Effect of H2S in syngas on the FischerTropsch synthesis performance of a precipitated iron catalyst
(Elsevier B.V., 20160305)The sulfur limit, the relationship between the sulfur added and the surface Fe atoms lost (Fe/S), and mechanism of sulfur poisoning were studied using an iron FischerTropsch synthesis (FTS) catalyst (100 Fe/5.1 Si/2.0Cu/3.0K). ... 
Effect of lowtemperature opacities on stellar evolution
(Wichita State University, 202112)Stellar evolution is studied through computational models of stars since any perceived change in the stars can take thousands if not millions of years. One of the physical quantities that defines the evolution of a star ... 
Effect of support pretreatment temperature on the performance of an iron FischerTropsch catalyst supported on silicastabilized alumina
(MDPI, 20180212)The effect of support material pretreatment temperature, prior to adding the active phase and promoters, on FischerTropsch activity and selectivity was explored. Four iron catalysts were prepared on silicastabilized ... 
The effects of individual metal contents on isochrones for C, N, O, Na, Mg, Al, Si, and Fe
(IOP Publishing, 20160728)The individual characteristics of C, N, O, Na, Mg, Al, Si, and Fe on isochrones have been investigated in this study. Stellar models have been constructed for various mixtures in which the content of each element is changed ... 
Efficient calculation of SchwarzChristoffel transformations for multiply connected domains using Laurent series
(Heldermann Verlag, 201308)We discuss recently developed numerics for the Schwarz–Christoffel transformation for unbounded multiply connected domains. The original infinite product representation for the derivative of the mapping function is replaced ... 
Eigenvalue estimates on QuaternionKähler manifolds
(Springer, 20230109)We prove lower bound estimates for the first nonzero eigenvalue of the Laplacian on a compact quaternionKähler manifold. For the closed or Neumann case, the lower bounds depend on dimension, diameter, and lower bound of ... 
Elementary applications of matrices
(Wichita State University, 194807)This treatise is concerned principally with the fundamental properties of matrices, the basic operations which may be performed with them, and some of their applications to algebra, analytic geometry, and differential ... 
Elliptic Equations: Many Boundary Measurements
(Springer, 2017)We consider the Dirichlet problem (4.0.1), (4.0.2). At first we assume that for any Dirichlet data g0 we are given the Neumann data g1; in other words, we know the results of all possible boundary measurements, or the ... 
Elliptic equations: Single boundary measurements
(Springer, 2017)In this chapter we consider the elliptic secondorder differential equation Au=finΩ,f=f0−∑j=1n∂jfjAu=finΩ,f=f0−∑j=1n∂jfj with the Dirichlet boundary data u=g0on∂Ω.u=g0on∂Ω. We assume that A = div(−a∇) + b ⋅ ∇ + c ... 
Enhanced thermal and dielectric performance in ternary $PVDF/PVP/Co_3O_4$ nanocomposites
(Wiley, 20211111)The main objective of this research was to prepare high thermal and dielectric performance $PVDF/PVP/Co_3O_4$ nanocomposites (PVDF, oply(vinylidene fluoride); PVP, polyvinylpyrrolidone) using the method of solution mixing. ... 
Enhancement of the critical current density in FeOcoated MgB2 thin films at high magnetic fields
(BEILSTEININSTITUT, 20111214)The effect of depositing FeO nanoparticles with a diameter of 10 nm onto the surface of MgB2 thin films on the critical current density was studied in comparison with the case of uncoated MgB2 thin films. We calculated the ... 
Epileptic foci localization using the inverse source problem for Maxwell's equations
(Wichita State University, 202005)Consider an application of the inverse source problem for Maxwell's equations to the matter of epileptic foci localization in the human brain. Using a current dipole to model the epileptic focus in the brain, and by ... 
Equilibrium configurations for a floating drop
(BirkhäuserVerlag, Basel, 20041201)If a drop of fluid of density ρ1 rests on the surface of a fluid of density ρ2 below a fluid of density ρ0, ρ0 < ρ1 < ρ2, the surface of the drop is made up of a sessile drop and an inverted sessile drop which match an ... 
Equivalence testing for mean vectors of multivariate normal populations
(Wichita State University, 201005)This dissertation examines the problem of comparing samples of multivariate normal data from two populations and concluding whether the populations are equivalent; equivalence is defined as the distance between the mean ... 
Estimating cumulative incidence functions when the life distributions are constrained
(Academic Press, 2010055)In competing risks studies, the KaplanMeier estimators of the distribution functions (DFs) of lifetimes and the corresponding estimators of cumulative incidence functions (CIFs) are used widely when no prior information ... 
Estimation of a starshaped distribution function
(Taylor & Francis LTD, 2017)A life distribution function (DF) F is said to be starshaped if F(x)/x is nondecreasing on its support. This generalises the model of a convex DF, even allowing for jumps. The nonparametric maximum likelihood estimation ... 
Estimation of distributions with the new better than used in expectation property
(Elsevier, 201305)A lifetime X with survival function S, mean residual life function (MRL) M, and finite mean μ is said to be new better than used in expectation (NBUE) if M(t)≤μ for all t≥0. We propose a new estimator for S, based on a ... 
Examples of discontinuity for the variational solution of the minimal surface equation with Dirichlet data on a domain with a nonconvex corner and locally negative mean curvature
(Wichita State University, 201312)The purpose of this thesis is to investigate the role of smoothness, specifically the smoothness of the boundary ∂Ω, in the behavior of the variational solution f on a domain Ω to the Dirichlet problem for the Minimal ... 
The existence of MorseSmale diffeomorphisms in the family of Hénon maps
(Wichita State University, 200905)We consider Hénon maps on ℝ² of the form fa,c(x,y)=(y,y2+c+ax) with real parameters (a, c). Due to the work of S. Hayes and C. Wolf [8], we provide a detailed investigation of the parameters 0 < a < 1 and c = 0. For each ...