5,474 research outputs found

    Surface Landau-Level Resonance in Silver.

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    Local values of the Fermi velocity of Ag are determined along the central zones of the (100) and (110) sample planes and at the neck in the (111) plane. Resonance spectra of magentic field induced quantum surface states, known as surface Landau-level resonances (SLLR), are used along with geometric factors calculated from analytical expressions for the Fermi surface to determine the location and Fermi velocity of the resonant electrons by an iterative process. These velocities are compared to those previously derived from inversions of cyclotron mass data and to point measurements made in the time of flight effect. In addition, measurements of the anisotropic electron-phonon collision frequency on the Fermi surface of Ag are reported for a number of points on the intersection of the Fermi surface with the (100) and (110) central planes and at the neck and point in the (111) plane. Analyses of the temperature dependent SLLR line shapes are used to obtain the electron-phonon scattering rates at each resonant electron location. It is shown that by careful consideration of the effects of thermal averaging and of the limitations of the functional forms used in fitting the orbit averaged data obtained in the radio frequency size effect and the time of flight effect, it is possible to resolve many of the discrepancies between the results of previous experiments. The results of this experiment in conjunction with previous measurements give a complete picture of the anisotropy of electron-phonon scattering in Ag

    Iconology, visual culture and media aestetics

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    The article contains fragments of three chapters form the book Image Science. Iconology, Visual Culture and Media Aesthetics (Chicago 2015), titled The are no Visual Media , Back to the Drawing Board  and Foundational Sites and Occupied Spaces . W. J. T. Mitchell created in his previous works the key concepts which imply an approach to images as true objects of investigation – an “image science”. Author, continuing with his influential line of thoughts, amplifies interdisciplinary studies of visual media. The chapters also delve into such topics as conections between new media and architecture or the occupation of space in contemporary popular uprisings. Image science  is a call for a method of studying images that overcomes the “two-culture split” between the natural and human sciences.The article contains fragments of three chapters form the book Image Science. Iconology, Visual Culture and Media Aesthetics (Chicago 2015), titled The are no Visual Media , Back to the Drawing Board  and Foundational Sites and Occupied Spaces . W. J. T. Mitchell created in his previous works the key concepts which imply an approach to images as true objects of investigation – an “image science”. Author, continuing with his influential line of thoughts, amplifies interdisciplinary studies of visual media. The chapters also delve into such topics as conections between new media and architecture or the occupation of space in contemporary popular uprisings. Image science  is a call for a method of studying images that overcomes the “two-culture split” between the natural and human sciences

    Community power structure: a methodological analysis and comparison

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    METHOD OF STIRRING GASES WITHIN A CLOSED CHAMBER

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    Distributed credential chain discovery in trust management

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    Representative Moakley with Representatives Bill Clay and Parren Mitchell, audio recording, 1974

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    This recording includes five interviews with members of Congress that were broadcast on WILD as episodes of a radio show featuring Congressman John Joseph Moakley. In the first segment Representative Joe Moakley discusses the Anti-Poverty Agency and the Office of Economic Opportunity. The second interview he focuses on Summer Neighborhood Youth Corp. The third segment includes a discussion with Representative Parren Mitchell about housing legislation. In the fourth interview Congressman Moakley speaks about the Older Americans Act and the Elderly Program. The last segment includes a discussion with Representative Bill Clay and focuses on the Corporation for Public Broadcasting and public television.https://dc.suffolk.edu/moakley-av/1018/thumbnail.jp
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