2,020,029 research outputs found

    2016-2017 Use and Reach of Dental Medicine Publications in Digital Scholarship@UNLV

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    The Dental Medicine Digital Scholarship Collection contains faculty publications and theses and dissertations. This report contains data for the 2016-2017 Academic Year (August 2016-July 2017) downloads (how many and where from-“reach”) of fulltext materials in Digital Scholarship@UNLV. Records that only contain metadata do not generate downloads and therefore are not reflected in the maps and show as 0 in the download report attached at the end

    2016-2017 Use and Reach of Allied Health Sciences Publications in Digital Scholarship@UNLV

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    The Allied Health Sciences Digital Scholarship@UNLV Collection contains faculty publications and graduate student works. This report contains data for the 2016-2017 Academic Year (August 2016-July 2017) downloads (how many and where from-“reach”) of fulltext materials in Digital Scholarship@UNLV. Records that only contain metadata do not generate downloads and therefore are not reflected in the maps and show as 0 in the download report attached at the en

    Phonics screening check: 2016 materials

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    Two-dimensional Phononic Crystals with Acoustic-Band Negative Refraction

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    A two-dimensional phononic crystal (PC) can exhibit longitudinal-mode negative energy refraction on its lowest (acoustical) frequency pass band. The effective elastodynamic properties of a typical PC are calculated and it is observed that the components of the effective density tensor can achieve negative values at certain low frequencies on the acoustical branches for the longitudinal-mode pass-band, and that negative refraction may be accompanied by either positive or negative effective density. Furthermore, such a PC has a high anisotropy ratio at certain low frequencies, offering potential for application to acoustic cloaking where effective material anisotropy is essential.Comment: in Proceedings of the ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Stowe, VT (2016

    Anisotropy, phonon modes, and lattice anharmonicity from dielectric function tensor analysis of monoclinic cadmium tungstate

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    We determine the frequency dependence of four independent CdWO4_4 Cartesian dielectric function tensor elements by generalized spectroscopic ellipsometry within mid-infrared and far-infrared spectral regions. Single crystal surfaces cut under different angles from a bulk crystal, (010) and (001), are investigated. From the spectral dependencies of the dielectric function tensor and its inverse we determine all long wavelength active transverse and longitudinal optic phonon modes with AuA_u and BuB_u symmetry as well as their eigenvectors within the monoclinic lattice. We thereby demonstrate that such information can be obtained completely without physical model line shape analysis in materials with monoclinic symmetry. We then augment the effect of lattice anharmonicity onto our recently described dielectric function tensor model approach for materials with monoclinic and triclinic crystal symmetries [Phys. Rev. B, 125209 (2016)], and we obtain excellent match between all measured and modeled dielectric function tensor elements. All phonon mode frequency and broadening parameters are determined in our model approach. We also perform density functional theory phonon mode calculations, and we compare our results obtained from theory, from direct dielectric function tensor analysis, and from model lineshape analysis, and we find excellent agreement between all approaches. We also discuss and present static and above reststrahlen spectral range dielectric constants. Our data for CdWO4_4 are in excellent agreement with a recently proposed generalization of the Lyddane-Sachs-Teller relation for materials with low crystal symmetry [Phys. Rev. Lett. 117, 215502 (2016)].Comment: arXiv admin note: text overlap with arXiv:1512.0859
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