14,117 research outputs found
The advanced receiver 2: Telemetry test results in CTA 21
Telemetry tests with the Advanced Receiver II (ARX II) in Compatibility Test Area 21 are described. The ARX II was operated in parallel with a Block-III Receiver/baseband processor assembly combination (BLK-III/BPA) and a Block III Receiver/subcarrier demodulation assembly/symbol synchronization assembly combination (BLK-III/SDA/SSA). The telemetry simulator assembly provided the test signal for all three configurations, and the symbol signal to noise ratio as well as the symbol error rates were measured and compared. Furthermore, bit error rates were also measured by the system performance test computer for all three systems. Results indicate that the ARX-II telemetry performance is comparable and sometimes superior to the BLK-III/BPA and BLK-III/SDA/SSA combinations
Spatial and temporal aspects of visual backward masking in children and young adolescents
We thank Marc Repnow for his help setting up the experiments. In addition, we thank two anonymous reviewers for their very thoughtful and helpful comments. This work was supported by the Volkswagen Foundation project āBetween Europe and the OrientāA Focus on Research and Higher Education in/on Central Asia and the Caucasusā and by the VELUX Foundation project āPerception, Cognition and Healthy Brain Aging.āPeer reviewedPublisher PD
Generalized Attractor Points in Gauged Supergravity
The attractor mechanism governs the near-horizon geometry of extremal black
holes in ungauged 4D N=2 supergravity theories and in Calabi-Yau
compactifications of string theory. In this paper, we study a natural
generalization of this mechanism to solutions of arbitrary 4D N=2 gauged
supergravities. We define generalized attractor points as solutions of an
ansatz which reduces the Einstein, gauge field, and scalar equations of motion
to algebraic equations. The simplest generalized attractor geometries are
characterized by non-vanishing constant anholonomy coefficients in an
orthonormal frame. Basic examples include Lifshitz and Schrodinger solutions,
as well as AdS and dS vacua. There is a generalized attractor potential whose
critical points are the attractor points, and its extremization explains the
algebraic nature of the equations governing both supersymmetric and
non-supersymmetric attractors.Comment: 31 pages, LaTeX; v2, references fixed; v3, minor changes, version to
appear in Phys. Rev.
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