37,619 research outputs found

    Bike Athlete Performance

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    Faculty reflection on VCU Great Bike Race Book course. Course Description: This track will focus on nutritional and training practices of cyclists competing in the UCI Worlds. YouTube Videos referenced in reflection: VCU Exercise Science: Christian Vande Velde Interview VCU Exercise Science - Sports Nutritionist Dr Janet Rankin Interview Fuel for a 5 Hour Ride Assignment 3: My Musette Assignment 4: Bike Athlete Performance VCU Exercise Science: Professional Cyclist Evie Stevens Intervie

    Effective Carrier Mean-Free Path in Confined Geometries

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    The concept of exchange length is used to determine the effects of boundary scattering on transport in samples of circular and rectangular cross section. Analytical expressions are presented for an effective mean-free path for transport in the axial direction. The relationship to the phonon thermal conductivity is discussed. (This letter outlines the results presented in detail in the longer version, available as cond-mat/9402081)Comment: 12 pages, Late

    Magnetic flux pinning in superconductors with hyperbolic-tesselation arrays of pinning sites

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    We study magnetic flux interacting with arrays of pinning sites (APS) placed on vertices of hyperbolic tesselations (HT). We show that, due to the gradient in the density of pinning sites, HT APS are capable of trapping vortices for a broad range of applied magnetic fluxes. Thus, the penetration of magnetic field in HT APS is essentially different from the usual scenario predicted by the Bean model. We demonstrate that, due to the enhanced asymmetry of the surface barrier for vortex entry and exit, this HT APS could be used as a "capacitor" to store magnetic flux.Comment: 7 pages, 5 figure

    Phase diagram of the CuO3CuO_{3} chains in YBa2Cu3O6+XYBa_{2}Cu_{3}O_{6+X} and PrBa2Cu3O6+XPrBa_{2}Cu_{3}O_{6+X}

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    We use a mapping of the multiband Hubbard model for CuO3CuO_{3} chains in RBa2Cu306+xRBa_{2}Cu_{3}0_{6+x} (R=Y or a rare earth) onto a tJt-J model and the description of the charge dynamics of the latter in terms pf s spinless model, to study the electronic structure of the chains. We briefly review results for the optical conductivity and we calculate the quantum phase diagram of quarter filled chains including Coulomb repulsion up to that between next-nearest-neighbor CuCu atoms V2V_{2}, using the resulting effective Hamiltonian, mapped onto an XXZ chain, and the method of crossing of excitation spectra. The method gives accurate results for the boundaries of the metallic phase in this case. The inclusion of V2V_{2} greatly enhances the region of metallic behavior of the chains.Comment: 10 pages, 3 figures. Submited to Phys. Rev.

    Simple Non-Markovian Microscopic Models for the Depolarizing Channel of a Single Qubit

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    The archetypal one-qubit noisy channels ---depolarizing, phase-damping and amplitude-damping channels--- describe both Markovian and non-Markovian evolution. Simple microscopic models for the depolarizing channel, both classical and quantum, are considered. Microscopic models which describe phase damping and amplitude damping channels are briefly reviewed.Comment: 13 pages, 2 figures. Title corrected. Paper rewritten. Added references. Some typos and errors corrected. Author adde
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