Now showing items 80-99 of 415

• #### Effect of gallium additions on reduction, carburization and Fischer-Tropsch activity of iron catalysts ﻿

(Springer US, 2018-07)
Undoped and gallium-doped iron oxide catalysts (100Fe, 100Fe:2Ga, and 100Fe:5Ga) were prepared by following a continuous co-precipitation technique using ammonium hydroxide as precipitant. The catalysts were characterized ...
• #### Effect of H2S in syngas on the Fischer-Tropsch synthesis performance of a precipitated iron catalyst ﻿

(Elsevier B.V., 2016-03-05)
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 Fischer-Tropsch synthesis (FTS) catalyst (100 Fe/5.1 Si/2.0Cu/3.0K). ...
• #### Effect of low-temperature opacities on stellar evolution ﻿

(Wichita State University, 2021-12)
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 Fischer-Tropsch catalyst supported on silica-stabilized alumina ﻿

(MDPI, 2018-02-12)
The effect of support material pretreatment temperature, prior to adding the active phase and promoters, on Fischer-Tropsch activity and selectivity was explored. Four iron catalysts were prepared on silica-stabilized ...
• #### The effects of individual metal contents on isochrones for C, N, O, Na, Mg, Al, Si, and Fe ﻿

(IOP Publishing, 2016-07-28)
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 Schwarz-Christoffel transformations for multiply connected domains using Laurent series ﻿

(Heldermann Verlag, 2013-08)
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 ...
• #### Elementary applications of matrices ﻿

(Wichita State University, 1948-07)
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 second-order 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, 2021-11-11)
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 FeO-coated MgB2 thin films at high magnetic fields ﻿

(BEILSTEIN-INSTITUT, 2011-12-14)
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, 2020-05)
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 ﻿

(Birkhäuser-Verlag, Basel, 2004-12-01)
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, 2010-05)
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 ﻿

In competing risks studies, the Kaplan-Meier 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 star-shaped distribution function ﻿

(Taylor & Francis LTD, 2017)
A life distribution function (DF) F is said to be star-shaped 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, 2013-05)
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, 2013-12)
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 Morse-Smale diffeomorphisms in the family of Hénon maps ﻿

(Wichita State University, 2009-05)
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 ...
• #### Experimental pairwise entanglement estimation for an N-qubit system: a machine learning approach for programming quantum hardware ﻿

(Springer, 2020-11-03)
Designing and implementing algorithms for medium- and large-scale quantum computers is not easy. In the previous work, we have suggested, and developed, the idea of using machine learning techniques to train a quantum ...