86,551 research outputs found
Glacier Surface Velocities and Outlet Areas from 2014-2018 on James Ross Island, Northern Antarctic Peninsula
No full textThese data report the spatial and temporal variability of glacier surface velocities and the area of their outlets throughout James Ross Island at the northern Antarctic Peninsula. Manually digitized calving front positions from panchromatic Landsat-8 data at 15 m resolution were used to calculate outlet areas by using a common-box approach. The common-box outlines were digitized by using the relative steep apparent coastlines of the current glacier bay and the visible brim of the cliff in a Landsat-8 scene from 2017-02-20, as well as side boundaries from Davies et al. (2012). Velocity estimates are retrieved from intensity feature tracking of TerraSAR-X and TanDEM-X scenes between 2014 and 2018 and clipped to the outlet area of the temporally nearest data of the area data set. More details about the processing can be found in Lippl et al. (2019).
The naming convention is:
Areas: Area_*GlimsID_*LandsatSceneDate (Format: shapefile)
Reference Polygon for Common-box approach: Area_*GlimsID_ReferencePolygon (Format: shapefile)
Velocities: Velocity_*GlimsID_*LandsatScenceDate_dis_mag+*StartDate--*EndDate_crop.tif_focalStd21_crop.tif (Format: GeoTIFF, Unit: Meter per day)
(Parameter after * are variable. StartDate and EndDate are the dates of the used TerraSAR-X and TanDEM-X scenes in intensity feature tracking. When no GlimsID was available for the glacier, the ID used by Davies et al. (2012) or names used in the submitted paper from Lippl et al. (2019) were applied.
In-situ ice thickness measurements derived with ground penetrating radar from Gourdon Glacier, Antarctic Peninsula
No full textThese data report in-situ ground penetrating radar (GPR) ice thickness measurements at the outlet and the catchment area of Gourdon Glacier on James Ross Island, northern Antarctic Peninsula. Data were conducted in 2017-02-15 and 2018-02-10 with a 25 MHz GPR antenna flown as a sling load by a Bell 212 helicopter. The processing of the GPR data was done in the software REFLEXW v.8.5 (Sandmeier geophysical research) and includes interpolation to equidistant traces, bandpass filtering (10 MHz lower cutoff, 50 MHz upper cutoff), correction to real start time, application of a gain function, and a 2D-finite-difference migration. The travel-time in ice was converted to ice-thickness in meter ["IceThickness(m)"] by applying a constant velocity of 168 m/µs. In case of data from the plateau, a standard correction value for firn and snow of +10 m is applied. The associated error resulting from the GPR measurements ["IceThickness_GPR_error(m)"] and the error additional considering the horizontal positioning accuracy ["IceThickness_Data_error(m)"] are calculated after Lapazaran et al. (2016). Further details about the processing and the error calculation are described in Lippl et al. (in submission). In addition, the surface elevation in reference to the WGS84 ellipsoid [SurfaceElevation(m)] derived from the GNSS signal and the GPR backscatter is included. However, surface elevations can be prone to errors of several meters due to the large foodprint of the radar and the GNSS accuracy
Variations on the Author
No full text“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
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
John F. Kennedy telegram to Roosevelt
No full textJersey Homesteads (later the Borough of Roosevelt) was established in the 1930s as an agro-industrial cooperative community. It was established specifically for urban Jewish garment workers, many of whom had emigrated from Europe. President John F. Kennedy sent a telegram to the citizens of Roosevelt, New Jersey, apologizing for not being able to attend the memorial dedication in honor of former President Franklin Delano Roosevelt. (Jersey Homesteads became Roosevelt in 1945 in honor of the president.) President Kennedy expressed his gratitude to the people of Roosevelt for constructing the memorial, and commented that it will serve as a constant reminder of Roosevelt's good works
Logarithmic variance profiles and the corresponding f-1 spectra of temperature fluctuations in turbulent Rayleigh-Bénard convection
No full textWe report experimental results for the temperature variance 2(z) and the corresponding frequency spectra P(f) in turbulent Rayleigh-Bénard convection (RBC) in a cylindrical sample of aspect ratioT= D/L = 1:00 (D = 1:12 m is the diameter and L = 1:12 m the height). The measurements were conducted in the Rayleigh-number range 1011 < Ra < 1:35 1014 and Pr ' 0:8. For Ra = 1:35x1014, 2(z) could be described well by a logarithmic dependence on the vertical position z in a range of z 1 < z < z 2 with z 1 ' 70 and z 2 = 0:1L. Here L=(2Nu) is the thickness of a thin thermal sublayer adjacent to the horizontal plate where the heat flux (denoted by the Nusselt number Nu) is carried mostly by thermal diffusion. In the log layer, we found that the temperature spectra had a significant frequency range over which P(f) f with close to 1. As Ra decreased, increased so that the log layer became thinner. At Ra = 2:05 1011, z 2 < z 1 and therefore there was no range for a log layer. Correspondingly, the temperature spectrum near the horizontal plate did not have the f1 scaling form either
Maine author Franklin F. Gould recalls his first glimpse of the outside world
No full textMaine author Franklin F. Gould recalls his first glimpse of the outside world as he relates how, as a young farm boy in the late 1800\u27s, he drove his father\u27s horses on an errand to an icebound river
Mapping the Discipline of the Olympic Games An Author-Cocitation Analysis
No full textThe authors conducted an author cocitation analysis on prominent authors writing about the Olympics during the 1990s. Author cocitation is an established bibliometric technique that can be used to measure the relative similarities of topics written about by the cited authors. This enables a visual representation of the “intellectual space” of the discipline, in this case the Olympics, to be created for the period under review. So core and peripheral research areas are identified, along with their major contributors. The representation appears as a two-dimensional cluster-enhanced map. Subject expertise was then applied to the results to place labels on the generated clusters of authors and their topics
Sous-facteurs de L(F∞) d'indice 4cos2π/n,n≥3
No full textLet Q be a factor of type II1, λ a number in the Jones discrete series {4cosπ/m:m≥3}, and {ei} the Jones projections associated with λ. Denote by A2n and A1n the finite-dimensional von Neumann algebras generated, respectively, by {1,e2,⋯,en} and {1,e1,⋯,en}, with the corresponding traces. The author shows that, for n sufficiently large, the index of the inclusion An=(Q⊗A2n)∗A2nA1n⊂(Q⊗A2n+1)∗A2n+1A1n+1=An+1 is equal to λ (here ∗ denotes the reduced, amalgamated free product of the algebras in question). Using the random matrix model of Voiculescu, he proves that if Q is the von Neumann algebra L(F∞) of the free group with infinitely many generators, then An is isomorphic to L(F∞).
The two facts together imply the existence, for any λ in the Jones discrete series, of an irreducible subfactor of L(F∞) of index λ. This constitutes the first example of a nonhyperfinite, non-Γ II1 factor such that its Jones invariant is fully computable (the existence of nonirreducible subfactors of L(F∞) for any index ≥4 is a simple consequence of known results)
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