130,743 research outputs found
D. Noy. — Jefet Schwill erzählt, 1963 ; 1 Supplément-Serie zu Fabula... Reihe. A : Textes, Vol. IV
No full textScheiber Alexandre. D. Noy. — Jefet Schwill erzählt, 1963 ; 1 Supplément-Serie zu Fabula... Reihe. A : Textes, Vol. IV. In: Revue des études juives, tome 123, n°3-4, juillet-décembre 1964. pp. 554-556
Data for: Microstructurally-controlled versus bulk fault gouge K-Ar dating
No full textSupplement material 1: Description of the K-Ar and XRD methods.Supplement material 2: Interpreted XRD diffractograms of (a) FC-1, (b) DZ-1a (c) DZ-1b, (d) FC-2, (e) DZ-2a and (f) DZ-2b.Supplement material 3: XRD data, normalized to 100 wt%, and illite crystallinity (Kübler Index, given in Δ°2θ). Lower detection limit of XRD results is 1-2 wt% and uncertainty for quantification is c. 2-3 wt%. Kübler indices are standardized according to Warr (2018)
TOPS Imaging with TerraSAR-X: Mode Design and Performance Analysis
No full textThis paper reports about the performed investigations for the implementation of the wide swath TOPS imaging mode with TerraSAR-X. The TOPS mode overcomes the limitations imposed by the ScanSAR mode by steering the antenna along-track during the acquisition of a burst. In this way, a uniform signal to noise ratio (SNR) is achieved, and consequently, scalloping and an azimuth-dependent distributed target ambiguity ratio (DTAR) are avoided. However, the use of electronically steered antennas leads to a quantization of the steering law and a non-ideal pattern for squinted angles (grating lobes and main lobe reduction). The former provokes spurious peaks, while the latter introduces a slight scalloping and DTAR deterioration. These effects are analyzed and quantified for TerraSAR-X and a TOPS system design approach is presented. Next, the requirements concerning interferometry are investigated. Finally, several results are shown with TerraSAR-X data, including a comparison between the TOPS and ScanSAR modes and the reporting of first TOPS interferometric results
Definition of ICESat Selection Criteria for their Use as Height References for TanDEM-X
No full textThe TanDEM X satellite synthetic aperture radar (SAR) mission has the goal to deliver a high-precision global digital elevation model (DEM). The X band SAR interferometry (InSAR)-derived DEMs contain absolute and relative height errors that have to be minimized with the help of height references in order to achieve the specified accuracies. ICESat laser altimetry data are suited for this task, due to their accuracy and global distribution.
In order to gain experience in the comparison between a radar-derived DEM and ICESat GLA14 elevation data, an X band DEM was acquired over a test region with the experimental airborne radar system (E SAR) of the German Aerospace Center (DLR) in Oberpfaffenhofen. Additionally a laser DEM of the area was used to verify the height accuracy claimed by previously published ICESat studies. The experiments described in this paper include the derivation of global ICESat quality selection criteria and the resulting density of selected ICESat samples over the Earth. These aspects are crucial for a successful TanDEM X DEM generation
Navigation of Ships with Nuclear Cargoes: Dialogue between Flag and Coastal States as a Method for Managing the Dispute
No full textMeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
First 3-D reconstructions of target hidden beneath foliage by means of polarimetric SAR tomography
No full textSAR tomography (SARTom) is an imaging technique
that allows multiple phase center separation in the vertical
direction, leading to a 3-dimensional (3D) reconstruction of the
imaged scene. Retrieval of volume structure information (e.g.
for forest classification) and the solution of the layover problem
are two of the most promising applications. In this paper, SAR
tomography, in combination with polarimetry (PolSARTom), is
exploited to image and to extract characteristic features (e.g.
shape, height) of targets hidden beneath foliage. This analysis is
applied to L-band airborne data acquired by the E-SAR system
of the German Aerospace Center (DLR) during a tomographic
campaign that took place in September 2006 on the test site of
Dornstetten (Germany)
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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