55,606 research outputs found

    The effect of growth hormone on the growth of the tibia/fibula complex and femurs of hypophysectomized rats after unilateral limb denervation

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    Thesis (M.Sc.D.)--Boston University School of Graduate Dentistry, 1972 (Orthodontics)Bibliography included

    Tensor networks and the numerical renormalization group

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    The full-density-matrix numerical renormalization group (NRG) has evolved as a systematic and transparent setting for the cal- culation of thermodynamical quantities at arbitrary temperatures within the NRG framework. It directly evaluates the relevant Lehmann representations based on the complete basis sets intro- duced by Anders and Schiller (2005). In addition, specific attention is given to the possible feedback from low energy physics to high energies by the explicit and careful construction of the full thermal density matrix, naturally generated over a distribution of energy shells. Specific examples are given in terms of spectral functions (fdmNRG), time-dependent NRG (tdmNRG), Fermi-Golden rule calculations (fgrNRG), as well as the calculation of plain thermodynamic expectation values. Furthermore, based on the very fact that, by its iterative nature, the NRG eigenstates are naturally described in terms of matrix product states, the language of tensor networks has proven enormously convenient in the description of the underlying algorithmic procedures. This paper therefore also provides a detailed introduction and discussion of the prototypical NRG calculations in terms of their corresponding tensor networks.Comment: 20 pages, 11 figures (adapted from habilitation thesis

    On Galois-Division Multiple Access Systems: Figures of Merit and Performance Evaluation

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    A new approach to multiple access based on finite field transforms is investigated. These schemes, termed Galois-Division Multiple Access (GDMA), offer compact bandwidth requirements. A new digital transform, the Finite Field Hartley Transform (FFHT) requires to deal with fields of characteristic p, p \neq 2. A binary-to-p-ary (p \neq 2) mapping based on the opportunistic secondary channel is introduced. This allows the use of GDMA in conjunction with available digital systems. The performance of GDMA is also evaluated.Comment: 6 pages, 4 figures. In: XIX Simposio Brasileiro de Telecomunicacoes, 2001, Fortaleza, CE, Brazi

    Biologia e potencial de Doru luteipes no controle de Spodoptera frugiperda.

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    0 trabalho foi realizado no Centro Nacional de Pesquisa de Milho c Sorgo (CNPMS), em Sete Lagoas, MG, tendo como objetivo conhecer a biologia e o potencial de Doru luteipes (Scudder, 1876) como predador de ovos e larvas do Spodoptera frugiperda (J.E. Smith, 1797), em condições de laboratório. Estudou-se também, em condições do campo, o efeito do diversos inseticidas sobre o predador. Dos estudos bioecológicos, observou-se que as posturas possuem, em média, 26,6 ovos, e o período de incubação é do 7,31 dias. A fase ninfal variou de 37,1 a 50,1 dias, conforme o tratamento, e a fase adulta, de 83,2 dias para individuos alimentados com ovos, a 143 dias para individuos alimentados com larvas. 0 inseto mostrou urn bom potencial como predador de S. frugiperda, apresentando um consumo diário na fase ninfal de 12, 10 e 8 larvas, conforme estas foram oferecidas isoladamente, com folhas do milho ou com dieta. Na fase adulta, o consumo foi na mesma sequência da anterior, de 21, 19 e 10 larvas. Com relação aos inseticidas testados, os produtos permethrin, deltamethrin e methomyl foram eficientes no controle de S. frugiperda, e praticamente não afetaram o predador. Com base nos resultados, conclue-se que D. luteipes, em condições do laboratório, apresentou-se eficiente no controle de S. frugiperda e possui grande potencial para utilizado no controle deste inseto em milho, em condições do campo

    The CO A-X System for Constraining Cosmological Drift of the Proton-Electron Mass Ratio

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    The A1Π−X1Σ+\textrm{A}^1\Pi-\textrm{X}^1\Sigma^+ band system of carbon monoxide, which has been detected in six highly redshifted galaxies (z=1.6−2.7z=1.6-2.7), is identified as a novel probe method to search for possible variations of the proton-electron mass ratio (μ\mu) on cosmological time scales. Laboratory wavelengths of the spectral lines of the A-X (vv,0) bands for v=0−9v=0-9 have been determined at an accuracy of Δλ/λ=1.5×10−7\Delta\lambda/\lambda=1.5 \times 10^{-7} through VUV Fourier-transform absorption spectroscopy, providing a comprehensive and accurate zero-redshift data set. For the (0,0) and (1,0) bands, two-photon Doppler-free laser spectroscopy has been applied at the 3×10−83 \times 10^{-8} accuracy level, verifying the absorption data. Sensitivity coefficients KμK_{\mu} for a varying μ\mu have been calculated for the CO A-X bands, so that an operational method results to search for μ\mu-variation.Comment: 7 pages (main article), 3 figures, includes supplementary materia
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