143 research outputs found
Continuum-kinematics-based peridynamics and phase-field approximation of non-local dynamic fracture
In this work, two non-local approaches to dynamic fracture are investigated: a novel peridynamic formulation and a variational phase-field approach. The chosen continuum-kinematics-based peridynamic model extends the current peridynamic models by introducing surface and volume-based interactions. The phase-field fracture approach optimizes the bodyâs potential energy and provides a reliable method for predicting fracture in finite element computations. Both methods are able to efficiently compute crack propagation even when the cracks have arbitrary or complex patterns. We discuss the relations of critical fracture parameters in the two methods and show that our novel damage model for the continuum-kinematics-based peridynamics effectively manages fracture under dynamic loading conditions. Numerical examples demonstrate a good agreement between both methods in terms of crack propagation, fracture pattern, and in part, critical loading. We also show the limitations of the methods and discuss possible reasons for deviations
Euclid: Modelling massive neutrinos in cosmology -- a code comparison
The measurement of the absolute neutrino mass scale from cosmological
large-scale clustering data is one of the key science goals of the Euclid
mission. Such a measurement relies on precise modelling of the impact of
neutrinos on structure formation, which can be studied with -body
simulations. Here we present the results from a major code comparison effort to
establish the maturity and reliability of numerical methods for treating
massive neutrinos. The comparison includes eleven full -body implementations
(not all of them independent), two -body schemes with approximate time
integration, and four additional codes that directly predict or emulate the
matter power spectrum. Using a common set of initial data we quantify the
relative agreement on the nonlinear power spectrum of cold dark matter and
baryons and, for the -body codes, also the relative agreement on the
bispectrum, halo mass function, and halo bias. We find that the different
numerical implementations produce fully consistent results. We can therefore be
confident that we can model the impact of massive neutrinos at the sub-percent
level in the most common summary statistics. We also provide a code validation
pipeline for future reference.Comment: 43 pages, 17 figures, 2 tables; published on behalf of the Euclid
Consortium; data available at https://doi.org/10.5281/zenodo.729797
Mitwirkungsmöglichkeiten der Schule beim Vergabeverfahren fĂŒr das schulische Mittagessen
CONTRACTIBILITY OF MUSCLE FIBRES AS A POSSIBLE AID TO JUDGING TEXTURAL CHANGES IN FROZEN MEATS AND FISH
Neuordnung des schulischen Mittagessens an offenen und gebundenen Ganztagsgrundschulen sowie fĂŒr Förderzentren im Land Berlin
Open Access-Tag 2016 "Aktiv sein â etwas bewegen": GruĂworte des Referenten Forschung und wissenschaftlicher Nachwuchs
Das vorliegende GruĂwort wurde anlĂ€sslich des Open Access-Tages 2016 der Technischen UniversitĂ€t Chemnitz durch den Referenten (Schwerpunkt Forschung und wissenschaftlicher Nachwuchs) im BĂŒro des Rektors der TU Chemnitz gehalten. Der Redner ging auf die zunehmende Bedeutung von Open Access ein und hob die diesbezĂŒglichen Services der UniversitĂ€tsbibliothek hervor.The welcome speech was held on Open Access Day 2016 of Technische UniversitĂ€t Chemnitz by Michael Partmann, Assistant (specialized in Research and Junior Researchers) in the Rectorâs Office. The speaker mentioned the increasing importance of Open Access and highlighted the relevant services of the University Library
Changes in the adenosinetriphophatase activity and sulphydryl groups of cod flesh during frozen storage
Zur Frage der postmortalen Reaktionsfïżœhigkeit des kontraktilen Mechanismus der Muskulatur
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