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  • Structural analysis and cations distribution of nanocrystalline Ni1-xZnxFe1.7Ga0.3O4 

    Heiba, Zein K.; Mohamed, Mohamed Bakr; Hamdeh, Hussein H.; Ahmed, M. A. (Elsevier B.V., 2014-09-09)
    Nanostructured Ni1-xZnxFe1.7Ga0.3O4, with x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5 were prepared by citrate method and were investigated using X-ray diffraction and Mossbauer spectroscopy. The structure characterized using X-ray ...
  • Improved asymptotics of a decreasing mean residual life estimator 

    Lorenzo, Edgardo; Mukerjee, Hari (Taylor & Francis Group, 2014-09-17)
    The mean residual life of a life distribution, X, with a finite mean is defined by M(t) = E[X - t|X > t] for t > 0. Kochar etal. (2000) provided an estimator of M when it is assumed to be decreasing. They showed that its ...
  • Applications of the h-Cobordism Theorem 

    Burkemper, Matthew Bryan (Wichita State University, 2014-05)
    We provide an exposition of J. Milnor's proof of the h-Cobordism Theorem. This theorem states that a smooth, compact, simply connected n-dimensional manifold W with n greater than or equal to 6, whose boundary boundaryW ...
  • Geometry of horizontal bundles and connections 

    Ryan, Justin M. (Wichita State University, 2014-05)
    An Ehresmann connection on a fiber bundle pi: E --> M is defined by prescribing a suitable horizontal subbundle H of the tangent bundle piT: TE --> E. For a horizontal bundle to be suitable, it must have a property called ...
  • Isochrones for old (> 5 GYR) stars and stellar populations. I. models for-2.4 <= [Fe/H] <=+0.6, 0.25 <= Y <= 0.33, and-0.4 <= [alpha/Fe] <=+0.4 

    VandenBerg, Don A.; Bergbusch, Peter A.; Ferguson, Jason W.; Edvardsson, Bengt (IOP Publishing, 2014-10-10)
    Canonical grids of stellar evolutionary sequences have been computed for the helium mass-fraction abundances Y = 0.25, 0.29, and 0.33, and for iron abundances that vary from 2.4 to +0.4 (in 0.2 dex increments) when [alpha/Fe] ...
  • Fischer-Tropsch synthesis: morphology, phase transformation, and carbon-layer growth of iron-based catalysts 

    Pendyala, Venkat Ramana Rao; Graham, Uschi M.; Jacobs, Gary; Hamdeh, Hussein H.; Davis, Burtron H. (John Wiley & Sons, Inc., 2014-07)
    The morphological, phase transformations and carbon-layer growth for unpromoted and K-promoted iron catalysts were investigated over time during Fischer-Tropsch synthesis. Catalysts were activated in CO for 24 h, which ...
  • Fischer-Tropsch synthesis: deactivation as a function of potassium promoter loading for precipitated iron catalyst 

    Pendyala, Venkat Ramana Rao; Graham, Uschi M.; Jacobs, Gary; Hamdeh, Hussein H.; Davis, Burtron H. (Springer, 2014-10)
    The effect of potassium promoter loading (0, 0.5, 1.0 and 2.0 atomic ratio) on the performance of precipitated iron catalysts was investigated during Fischer-Tropsch synthesis using a continuously stirred tank reactor. ...
  • Fischer-Tropsch synthesis: effect of activation gas after varying Cu promoter loading over K-promoted Fe-based catalyst 

    Pendyala, Venkat Ramana Rao; Jacobs, Gary; Hamdeh, Hussein H.; Shafer, Wilson D.; Sparks, Dennis E.; Hopps, Shelley; Davis, Burtron H. (© Springer, 2014-09)
    The effects of activation gas and copper promoter loading on the Fischer-Tropsch synthesis performance of potassium promoted precipitated iron-based catalysts were investigated using a continuously stirred tank reactor. ...
  • Measurement of charged pion production yields off the NuMI target 

    Paley, J. M.; Messier, M. D.; Raja, R.; Akgun, U.; Asner, D. M.; Aydin, G.; Baker, W.; Barnes, P. D. Jr; Bergfeld, T.; Beverly, L.; Bhatnagar, V.; Choudhary, B.; Dukes, E. C.; Duru, F.; Feldman, G. J.; Godley, A.; Graf, N.; Gronberg, J.; Gulmez, E.; Gunaydin, Y. O.; Gustafson, H. R.; Hartouni, E. P.; Hanlet, P.; Heffner, M.; Kaplan, D. M.; Kamaev, O.; Klay, J.; Kumar, A.; Lange, D. J.; Lebedev, A.; Ling, J.; Longo, M. J.; Lu, L. C.; Materniak, C.; Mahajan, S.; Meyer, H.; Miller, D. E.; Mishra, S. R.; Nelson, K.; Nigmanov, T.; Norman, A.; Onel, Y.; Penzo, A.; Peterson, R. J.; Rajaram, D.; Ratnikov, D.; Rosenfeld, C.; Rubin, H.; Seun, S.; Singh, A.; Solomey, Nickolas; Soltz, R. A.; Torun, Y.; Wilson, K.; Wright, D. M.; Wu, Q. K. (American Physical Society, 2014-09)
    The fixed-target Main Injector Particle Production (MIPP) experiment, Fermilab E907, was designed to measure the production of hadrons from the collisions of hadrons of momenta ranging from 5 to 120 GeV/c on a variety of ...
  • Synthesis of highly ordered 30 nm NiFe2O4 particles by the microwave-combustion method 

    Mahmoud, Mohamed H.; Elshahawy, A. M.; Makhlouf, Salah A.; Hamdeh, Hussein H. (Elsevier B.V., 2014-11)
    NiFe2O4 of 30 nm average size was synthesized by microwave combustion and subsequent solid state reaction at 1273 K. The materials were characterized by X-ray diffraction, TEM, vibrating sample magnetometery and Mossbauer ...
  • Point vortex model for asymmetric inviscid wakes past bluff bodies 

    Elcrat, Alan R.; Ferlauto, M.; Zannetti, L. (IOP Publishing, 2014-05-27)
    Wakes past bluff bodies are modeled by means of point vortices standing in equilibrium. The consistency of the adopted model is discussed with respect to the asymptotic model proposed by Batchelor. It is shown that, in ...
  • Spectra of unitary integral operators on L-2 (R) with kernels k(xy) 

    Ma, Daowei; Chen, Goong (World Scientific, 2013)
    Unitary integral transforms play an important role in mathematical physics. A primary example is the Fourier transform whose kernel is of the form k(x, y) = k(xy), i.e., of the product type. Here we consider the determination ...
  • Some observations regarding steady laminar flows past bluff bodies 

    Fornberg, Bengt; Elcrat, Alan R. (Royal Society, 2014-07-28)
    Steady laminar flows past simple objects, such as a cylinder or a sphere, have been studied for well over a century. Theoretical, experimental and numerical methods have all contributed fundamentally towards our understanding ...
  • 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 

    Melin, Jaron Patric (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 ...
  • 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 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 ...
  • Covariance matrix functions of isotropic vector random fields 

    Wang, Renxiang; Du, Juan; Ma, Chunsheng (Taylor & Francis Group, 2014-05-15)
    An isotropic scalar or vector random field is a second-order random field in (d > 2), whose covariance function or direct/cross covariance functions are isotropic. While isotropic scalar random fields have been well developed ...
  • A quantum neural network computes its own relative phase 

    Behrman, Elizabeth C.; Steck, James E. (IEEE, 2013-04-17)
    Complete characterization of the state of a quantum system made up of subsystems requires determination of relative phase, because of interference effects between the subsystems. For a system of qubits used as a quantum ...
  • Cation distribution and dielectric properties of nanocrystalline gallium substituted nickel ferrite 

    Heiba, Zein K.; Mohamed, Mohamed Bakr; Ahmed, M. A.; Moussa, M. A. A.; Hamdeh, Hussein H. (Elsevier B.V., 2014-02-16)
    Nano crystalline NiFe2−xGaxO4, 0.0 ⩽ x ⩽ 1 ferrite was prepared by citrate method. The structural and micro structural evolutions of the nanophase have been studied using X-ray powder diffraction and the Rietveld method. ...
  • The Schoenberg-Levy kernel and relationships among fractional Brownian motion, bifractional Brownian motion, and others 

    Ma, Chunsheng (Society for Industrial and Applied Mathematics, 2013)
    Starting with a discussion about the relationship between the fractional Brownian motion and the bifractional Brownian motion on the real line, we find that a fractional Brownian motion can be decomposed as an independent ...

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