462 research outputs found
Die neue Universität Frankfurt
Die Universität Frankfurt steht vor der größten Herausforderung in ihrer annähernd 90-jährigen Geschichte.
Unterstützt und getragen durch den Willen der politischen Entscheider beim Land und der Stadt wird die Universität ihren Gründungsstandort in Bockenheim schrittweise aufgeben. ..
Separation and identification of dominant mechanisms in double photoionization
Double photoionization by a single photon is often discussed in terms of two
contributing mechanisms, {\it knock-out} (two-step-one) and {\it shake-off}
with the latter being a pure quantum effect. It is shown that a quasi-classical
description of knock-out and a simple quantum calculation of shake-off provides
a clear separation of the mechanisms and facilitates their calculation
considerably. The relevance of each mechanism at different photon energies is
quantified for helium. Photoionization ratios, integral and singly differential
cross sections obtained by us are in excellent agreement with benchmark
experimental data and recent theoretical results.Comment: 4 pages, 5 figure
Resource Allocation with Stability Constraints of an Edge-cloud controlled AGV
The paper proposes Resource Allocation (RA) schemes for a closed loop
feedback control system by analysing the control-communication dependencies. We
consider an Automated Guided Vehicle (AGV) that communicates with a controller
located in an edge-cloud over a wireless fading channel. The control commands
are transmitted to an AGV and the position state is feedback to the controller
at every time-instant. A control stability based scheduling metric 'Probability
of Instability' is evaluated for the resource allocation. The performance of
stability based RA scheme is compared with the maximum SNR based RA scheme and
control error first approach in an overloaded and non-overloaded scenario. The
RA scheme with the stability constraints significantly reduces the resource
utilization and is able to schedule more number of AGVs while maintaining its
stability. Moreover, the proposed RA scheme is independent of control state and
depends upon consecutive packet errors, the control parameters like sampling
time and AGV velocity. Furthermore, we also analyse the impact of RA schemes on
the AGV's stability and error performance, and evaluated the number of unstable
AGVs
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