Now showing items 212-231 of 372

    • Observation of seasonal variation of atmospheric multiple-muon events in the NOvA Near Detector 

      Cedeno, Alan J.; Meyer, Holger; Solomey, Nickolas; Altakarli, Sef (American Physical Society, 2019-06-28)
      Using two years of data from the NOvA Near Detector at Fermilab, we report a seasonal variation of cosmic ray induced multiple-muon $(N\mu\ge2)$ event rates which has an opposite phase to the seasonal variation in the ...
    • On an ad hoc test for order restricted multivariate normal means 

      Hu, Xiaomi (Taylor & Francis Group, 2016)
      For several normal mean vectors restricted by a simple ordering with respect to a multivariate order, this article derives sufficient and necessary conditions for the restricted MLEs for both mean vectors and covariance ...
    • On convergence sets of divergent power series 

      Fridman, Buma L.; Ma, Daowei; Neelon, Tejinder S. (Polish Academy of Sciences Institute of Mathematics, 2012)
      A nonlinear generalization of convergence sets of formal power series, in the sense of Abhyankar-Moh [J. Reine Angew. Math. 241 (1970)], is introduced. Given a family y = phi(s)(t, x) = sb(1)(x)t + b(2)(x)t(2) + ... of ...
    • On convergence sets of formal power series 

      Al-Shutnawi, Basma (Wichita State University, 2013-12)
      In this thesis we consider the convergence sets of formal power series of the form f(z, t)=sigma infinity j=0 pj(z)tj, where pj(z) are polynomials. A subset E of the complex plane C is said to be a convergence set if there ...
    • On cusp solutions to a prescribed mean curvature equation 

      Echart, Alexandra K.; Lancaster, Kirk E. (Pacific Journal of Mathematics, 2017-05)
      The nonexistence of "cusp solutions" of prescribed mean curvature boundary value problems in Omega x R when Omega is a domain in R-2 is proven in certain cases and an application to radial limits at a corner is mentioned.
    • On determining sets for holomorphic automorphisms 

      Fridman, Buma L.; Kim, Kang-Tae; Krantz, Steven G.; Ma, Daowei (Rocky Mountain Mathematics Consortium, 2006-01-14)
      We study sets K in the closure of a domain D Cn such that, if an automorphism ' of D fixes each point of K, then ' is the identity mapping. A separate result is proved for the case that K lies entirely in the boundary of D.
    • On increased stability in the continuation of the Helmholtz equation 

      Aralumallige, Deepak; Isakov, Victor, 1947- (IOP Publishing, 2007-08)
      In this paper, we give analytical and numerical evidence of increasing stability in the Cauchy problem for the Helmholtz equation in the whole domain when frequency is growing. This effect depends upon the convexity ...
    • On increasing stability in the two dimensional inverse source scattering problem with many frequencies 

      Entekhabi, Mozhgan (Nora); Isakov, Victor, 1947- (IOP Publishing, 2018-03-29)
      In this paper, we will study the increasing stability in the inverse source problem for the Helmholtz equation in the plane when the source term is assumed to be compactly supported in a bounded domain O with a sufficiently ...
    • On increasing stability of the continuation for elliptic equations of second order without (Pseudo)convexity assumptions 

      Isakov, Victor, 1947- (American Institute of Mathematical Sciences, 2019-10)
      We derive bounds of solutions of the Cauchy problem for general elliptic partial differential equations of second order containing parameter (wave number) k which are getting nearly Lipschitz for large k. Proofs use energy ...
    • On inverse gravimetry problem 

      Titi, Aseel (Wichita State University, 2020-05-01)
      The inverse problem in gravimetry is to find a domain D inside the unit disk Ω from boundary measurements of exterior gravitational force. We found that about five parameters of the unknown D can be stably determined given ...
    • On the asymptotic behavior of solutions of quasilinear elliptic equations 

      Lancaster, Kirk E.; Stanley, Jeremy (Springer-Verlag, 2003-01-01)
      The asymptotic behavior of solutions of second-order quasilinear elliptic and nonhyperbolic partial differential equations defined on unbounded domains in R n contained in {(Xl, ..., Xn): Ix,~ I < ~(~/x~ +... + x~_ 1)} ...
    • On the convergence of row-modification algorithm for matrix projections 

      Hu, Xiaomi; Hansohm, Juergen; Hoffmann, Linda; Zohner, Ye Emma (Elsevier, 2012-02)
      This paper proposes an algorithm for matrix minimum-distance projection, with respect to a metric induced from an inner product that is the sum of inner products of column vectors, onto the collection of all matrices with ...
    • On the correction of anomalous phase oscillation in entanglement witnesses using quantum neural networks 

      Behrman, Elizabeth C.; Bonde, Richard E. F.; Steck, James E.; Behrman, Joanna F. (IEEE, 2013-10-01)
      Entanglement of a quantum system depends upon the relative phase in complicated ways, which no single measurement can reflect. Because of this, "entanglement witnesses'' (measures that estimate entanglement) are necessarily ...
    • On the existence of central fans of capillary surfaces 

      Khanfer, Ammar (Wichita State University, 2013-05)
      We prove that under some conditions, the central fans of capillary surfaces exist and are stable. We perturb the contact angle of a capillary surface for a bounded domain which is not necessarily symmetric, that has a ...
    • On the existence of convex classical solutions to a generalized Prandtl-Batchelor free boundary problem 

      Acker, Andrew (Birkhäuser Verlag, Basel, 2004)
      Under reasonably general assumptions, we prove the existence of convex classical solutions for the Prandtl-Batchelor free boundary problem in fluid dynamics, in which a flow of constant vorticity density is embedded in ...
    • On the inverse doping profile problem 

      Isakov, Victor, 1947-; Myers, Joseph Kenneth (American Institute of Mathematical Sciences, 2012-08)
      We obtain new analytic results for the problem of the recovery of a doped region D in semiconductor devices from the total flux of electrons/holes through a part of the boundary for various applied potentials on some ...
    • On the inverse gravimetry problem with minimal data 

      Titi, Aseel (Wichita State University, 2021-04-02)
      The inverse problem in gravimetry is to find a domain D inside the reference domain Ω from measurements of gravitational force outside Ω. We first considered the two-dimensional case where we found that about five parameters ...
    • On the inverse gravimetry problem with minimal data 

      Titi, Aseel (Wichita State University, 2021-07)
      In this dissertation we considered the inverse source problem $\Delta u = \mu,$ where lim $u (x) = 0$ as |x| goes to $\infty$ and $\mu$ is zero outside a bounded domain $\Omega$. The inverse problem of gravime- try is to ...
    • On the inverse source problem with boundary data at many wave numbers 

      Isakov, Victor, 1947-; Lu, Shuai (Springer, 2020-02-04)
      We review recent results on inverse source problems for the Helmholtz type equations from boundary measurements at multiple wave numbers combined with new results including uniqueness of obstacles. We consider general ...
    • On the Kolmogorov-Arnold representation theorem for continuous functions 

      Bragg, Aaron R. (Wichita State University, 2018-12)
      In 1900 at the International Congress of Mathematicians in Paris, D. Hilbert posed 23 questions that later became known as Hilbert's 23 problems. Number 13 remained unresolved for over half a century until 1956 and 1957 ...