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Browsing Mathematics, Statistics, and Physics by Title

Now showing items 68-87 of 87

Stability estimates for inverse problems of some elliptic equations

Ingle, William Nathan (Wichita State University, 2011-12)

In this dissertation we obtain new Carleman formulas for the solution of the Cauchy problem for equations P u = h, in Ω, u|E = f , where E ⊂ ∂Ω and | E | > 0. Our elliptic operator is of the form P = [ [2∂¯ 0 ; ...
Stability of continuation and obstacle problems in acoustic and electromagnetic scattering

Subbarayappa, Deepak Aralumallige (Wichita State University, 2010-12)

Study of the Cauchy problem for Helmholtz equation is motivated by the inverse scattering theory and more generally by remote sensing. In this dissertation the increased stability of the Cauchy problem for Helmholtz ...
Stability of coupled strings vibration system due to different boundary conditions

Sarhangi, G.R.; Najafi, M.; Wang, H. (IEEE, 1993-06-02)

We study the rate of convergence of a coupled wave systems under two different boundary conditions, energy absorbing in two ends for one and free or fixed boundary controls in two ends for the other one. We will observe ...
The stabilization of a linearized self-excited wave equation by an energy absorbing boundary

Sarhangi, G.R.; Najafi, M.; Wang, H. (IEEE, 1992-06-24)

We study the linrized self-excited wave quation tt - A £ -P(s) tg=0, where P(s)>0, P(r)eL(f), in a bounded domain 0cRI with smooth bounar r whee boun y dampig is prst. coniering the prtii Fr 1r.).of he bouM~ ron which ...
Stationary and isotropic vector random fields on spheres

Ma, Chunsheng (Springer, 2012-08)

This paper presents the characterization of the covariance matrix function of a Gaussian or second-order elliptically contoured vector random field on the sphere which is stationary, isotropic, and mean square continuous. ...
Status and latest results from MIPP

Meyer, Holger (Elsevier, 2012-12)

We briefly review the need for high quality hadron production data. The Main Injector Particle Production experiment (MIPP) at Fermilab collected data in 2005/2006 and published final results on forward neutron production ...
Steady axisymmetric vortex flows with swirl and shear

Elcrat, Alan; Fornberg, Bengt; Miller, Kenneth G. (Cambridge University Press, 2008-10)

A general procedure is presented for computing axisymmetric swirling vortices which are steady with respect to an inviscid flow that is either uniform at infinity or includes shear. We consider cases both with and without ...
Student's t vector random fields with power-law and log-law decaying direct and cross covariances.

Ma, Chunsheng (Taylor & Francis, Inc, 2013-01-01)

This article deals with the Student's t vector random field, which is formulated as a scale mixture of Gaussian vector random fields, and whose finite-dimensional distributions decay in power-law and have heavy tails. There ...
A study of particular coordinate systems

Ragan, Jennifer D. (Wichita State University, 2011-05)

This thesis is a study of the properties and relationships between isothermal, harmonic and characteristic coordinate systems. The proof of the existence of isothermal and characteristic coordinates on a manifold which ...
Superconductivity and structural variation of the electron-correlated layer systems Sr(Pd1-xTx)(2)Ge-2 (T = Co, Ni, Rh; 0 <= x <= 1)

Wang, J. W.; Chen, I. A.; Hung, T. L.; You, Y. B.; Ku, H. C.; Hsu, Y. Y.; Ho, J. C.; Chen, Y. Y. (American Physical Society, 2012-01-31)

Superconductivity variations deduced from the x-ray diffraction and the magnetic and heat-capacity measurements in the pseudoternary Sr(Pd1-xTx)(2)Ge-2 layer system [Pd(4d(8)), T = Co(3d(7)), Ni(3d(8)), or Rh(4d(7)); 0 <= ...
Testing homogeneity of a parameter matrix some of the rows of which are under synchronized order restrictions

Banerjee, Arijit (Wichita State University, 2011-12)

This research considers a multiple multivariate linear regression model with a parameter matrix some of the rows of which are constrained by synchronized order restrictions. The test on the homogeneity of the parameter ...
Testing homogeneity of a parameter matrix with some rows constrained by synchronized order restrictions

Banerjee, Arijit (Wichita State University. Graduate School, 2010-04-23)

A multivariate linear regression model Y~N (βM',Σ) is considered where some of the rows in the coefficient matrix β are constrained by synchronized order restrictions. A test scheme is derived for the homogeneity of the ...
Theoretical results in inverse problems for size, solvability, and uniqueness in the p-n junction and doping profile of semiconductors

Myers, Joseph Kenneth (2006-05)

We present an overview of mathematical models for electrons and holes in semiconductors. We use these to pose some inverse problems for determining the doping profile of a semiconductor. We establish the solvability of ...
Translating vortex pairs with prescribed profiles

Albrecht, Trenton R. (Wichita State University. Graduate School, 2010-04-23)

We generate translating vortex pairs with smooth or more arbitrary profiles that reflect modern vortex pairs being generated using prescribed domains of vorticity. Instead of prescribing the domain, we fix the area of the ...
Typical points, invariant measures, and dimension for rational maps on the Riemann sphere

Kaufmann, Jacie L. (2006-05)

We present three original results for the dynamics of rational maps on the Riemann sphere. Using methods from dimension and ergodic theory, we discuss generalized physical measures and prove their existence for hyperbolic ...
Uniqueness of inverse source problems for some semilinear elliptic equations

Myers, Joseph Kenneth (Wichita State University. Graduate School., 2007-04-27)

Uniqueness of positive f is established in the inverse source problem − Δu + c(x,u) = f (x) under conditions on the known coefficient c. This inverse problem is significant in the areas of semiconductor manufacturing, and ...
Variogram matrix functions for vector random fields with second-order increments

Du, Juan; Ma, Chunsheng (Springer, 2012-05)

The variogram matrix function is an important measure for the dependence of a vector random field with second-order increments, and is a useful tool for linear predication or cokriging. This paper proposes an efficient ...
Vector random fields with compactly supported covariance matrix functions

Du, Juan; Ma, Chunsheng (Elsevier, 2013-03)

The objective of this paper is to construct covariance matrix functions whose entries are compactly supported, and to use them as building blocks to formulate other covariance matrix functions for second-order vector ...
Vertical blow ups of capillary surfaces in R3, part 2: nonconvex corners

Jeffres, Thalia; Lancaster, Kirk (Texas State University - San Marcos, 2008-12)

The goal of this note is to continue the investigation started in Part One of the structure of “blown up” sets of the form P × R and N × R when P,N R2 and P (or N) minimizes an appropriate functional and the domain ...
Vertical blow ups of capillary surfaces in R3, part one: convex corners

Jeffres, Thalia; Lancaster, Kirk (Texas State University - San Marcos, 2007-11)

One technique which is useful in the calculus of variations is that of “blowing up”. This technique can contribute to the understanding of the boundary behavior of solutions of boundary value problems, especially when they ...