1,721,414 research outputs found
University of Amsterdam
No full textUniversity of Amsterdam: The old school building in the Roetersstraat, the housing of the ITF (Institute of Theoretical Physics) until 1963
Source: History of the ITFAhttps://digitalcommons.rockefeller.edu/cohen-leader-in-statistical-physics/1007/thumbnail.jp
Jan de Boer at the time of his retirement in 1981
No full textJan de Boer at the time of his retirement in 1981
Jan de Boer, Dutch physicist, has been E.G.D. Cohen’s doctoral advisor and the founder of the Institute for Theoretical Physics at the University of Amsterdam.https://digitalcommons.rockefeller.edu/cohen-leader-in-statistical-physics/1006/thumbnail.jp
Roetersstraat 1a
No full textRoetersstraat 1a (1951). From left to right: R. van Wageningen, R. Bird, J. van Kranendonk, J. de Boer, E.G.D. Cohen.
Courtesy of A.J. Kox
E.G.D. Cohen received his B.Sc. at the University of Amsterdam in 1952 and his Ph.D. at the University of Amsterdam in 1957https://digitalcommons.rockefeller.edu/cohen-leader-in-statistical-physics/1005/thumbnail.jp
Turbulent boundary layers: issues in Experiments
No full textTurbulent boundary layers, appearing on solid surfaces of bodies submerged in fluids are among the canonical, wall-bounded, turbulent flows together with channel and pipe flows that have been the focus of experimental and analytical investigations for almost a century. The relevance of a thorough theoretical and practical understanding cannot be underestimated for industrial application in engineering and aeronautical application.
Still there are several unresolved issues even related to fairly basic mechanisms, such as the variation of turbulent stresses with Reynolds number, scaling of spectra, what are the differences (if any) between confined flows (channel and pipe) and open boundary layer flows, the interaction between outer and inner region, the properties of small-scale turbulence near the dissipation range etc. Recent accurate experimental studies, but also direct numerical simulations (DNS) together with innovative theoretical studies have made it possible to further penetrate the details of such flows. At NORDITA classical experimental techniques will be presented and discussed together with new future developments
The Stability of Dark Matter Cusps
No full textcarried out at the Institute of Theoretical Physics of the University of Zürich under supervision of Prof. Dr. Ben Moore. Version 1.2 i
Dissipative three-wave structures in stimulated backscattering. I. A subluminous solitary attractor
No full textWe present a solitary solution of the three-wave nonlinear partial differential equation (PDE) model - governing resonant space-time stimulated Brillouin or Raman backscattering - in the presence of a cw pump and dissipative material and Stokes waves. The study is motivated by pulse formation in optical fiber experiments. As a result of the instability any initial bounded Stokes signal is amplified and evolves to a subluminous backscattered Stokes pulse whose shape and velocity are uniquely determined by the damping coefficients and the cw-pump level. This asymptotically stable solitary three-wave structure is an attractor for any initial conditions in a compact support, in contrast to the known superluminous dissipative soliton solution which calls for an unbounded support. The linear asymptotic theory based on the Kolmogorov-Petrovskii-Piskunov assertion allows us to determine analytically the wave-front slope and the subluminous velocity, which are in remarkable agreement with the numerical computation of the nonlinear PDE model when the dynamics attains the asymptotic steady regime. © 1997 The American Physical Society.Laboratoire de Physique de la Matière Condensée Centre National de la Recherche Scientifique Parc Valrose, F-06108 Nice Cedex 2Landau Institute of Theoretical Physics, Kosygina 2, 117940 GSP-1, MoscowApplied Mathematics Department University of Leeds, Leeds, West Yorkshire, LS2 9JTInstituto de Física Teórica Universidade Estadual Paulista, Rua Pamplona 145, 01405-900 São Paulo, SPInstituto de Física Teórica Universidade Estadual Paulista, Rua Pamplona 145, 01405-900 São Paulo, S
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
- …
