615 research outputs found
Members of the Jewish Repertory Theater, Warsaw, Poland
No full textMembers of the Jewish Repertory Theater in a scene from the third act of Danton's Death, by Georg Büchner, directed by Mikhl Weichert, at the Nowosci theater in WarsawDigital imagedigitize
A deconvolution protocol of the mechanical relaxation spectrum to identify and quantify individual polymer feature contributions to self-healing
No full text Starting from experimental macro-rheological data, we develop a fitting protocol that succeeded in the separation of the overlapping relaxation phenomena in the dissipative regime for a set of intrinsic healing polymers healing most effectively near their glass transition temperature T g . To allow for a proper deconvolution, the rheological master curves are converted to a relaxation spectrum (H(τ)) and this is fitted using an optimized mechanical model, e.g. the Maxwell-Weichert model. The deconvolution of overlapping segmental mobility and reversible interactions is successfully demonstrated for a set of polyimide and polyamide polymers containing none, one and two reversible dynamic features near-T g . Through the fitting parameters, the relaxation timescale of each feature and their apparent process enthalpies are obtained. The quantitative data obtained using the fitting protocol are then compared to macroscopic healing results. As a result, a clear correspondence between the energy stored by the system to accomplish reversible (e.g. H-bonds, π-π) and chain interdiffusion relaxation transitions and the healing efficiency of such polymers are obtained. The implementation of this protocol allows for a clearer identification of the relevant mechanisms in self-healing polymers and paves the way for the development of more efficiently healable polymeric systems. Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Novel Aerospace MaterialsChemE/Advanced Soft Matte
Vermittlung von Praxiswissen zu Web-Usability – Aktueller Entwicklungsstand von usability-toolkit.de T. Bartel, G. Quint, S. Weichert, B. Heuwing,
No full textDieser Beitrag berichtet über den aktuellen Stand bei der Entwicklung eines Toolkit zur Vermittlung von UsabilityGrundlagen durch die Integration von Praxiswissen und einfach zugänglichen Werkzeugen. Die zugrundeliegenden Überlegungen werden erläutert und weitergehende Planungen vorgestellt
Inelastic analysis of structures under variable loads : theory and engineering applications
No full textInelastic Behaviour of Structures under Variable Repeated Loads: Direct Analysis Methods
No full textInelastic analysis of structures under variable loads : theory and engineering applications
No full textA kinematic method for shakedown and limit analysis of periodic heterogeneous media
No full textIn this Chapter the kinematic (second, Koiter's) shakedown theorem is applied to the representative volume of periodic heterogeneous media with Huber-Mises local plastic behavior. The adopted formulation of shakedown analysis is based on periodicity boundary conditions, conventional finite element modeling and penalization enforcement of plastic incompressibility. A cost-effective iterative solution procedure is discussed and computationally tested. Numerical tests and engineering applications are presented with reference to perforated plates and metal-matrix unidirectional fiber-reinforced composites
2012 Gala Program
No full textHonoring
Groundbreaker Award Recipients:Hon. Ernst H. Rosenberger ’58, Of Counsel, Stroock & Stroock & Lavan LLPGerald C. Crotty ’76, President, Weichert Enterprise, LLCCynthia G. Senko Rosicki ’86, Co-founder, Sparkling Pointe Vineyards and Winery; Founding Partner, Rosicki, Rosicki & Associates, P.C.
Dean’s Award for Excellence in Leadership and Service:Daniel J. Oates ’86, Chief of Police, Aurora, Colorado, Police Departmenthttps://digitalcommons.nyls.edu/gala_programs/1003/thumbnail.jp
Elastic–Plastic Optimisation of a Cable–Rib Satellite Antenna
No full textCable–rib satellite antennas are facing a growing challenging quest of
technological operation and connected structural performance, specifically in the
context of large–scale, deployable aerospace applications. In the framework of Limit
Analysis, as a specific tool of structural modelling, within the Theory of Plasticity,
accounting for potential material non–linearity, up to structural collapse, as an
assumed general paradigm of structural resilience, the present contribution analyses
a specific cable–rib satellite antenna through a novel evolutive algorithm, in order to
assess possible activations of plastic joints, under perfect–plasticity conditions, and
to consistently estimate static and kinematic features at incipient collapse. Modelling
both beam elements (with a tubular cross–section) and cable elements, the underlying
elastic–plastic analysis is then coupled to an optimisation process, toward the
minimisation of displacements at incipient collapse, with respect to initial cable
shortenings or, in an equivalent manner, cable pretensions. Further investigations are
also developed, within the optimisation tool, re–joining dynamic modal properties
with elastic–plastic outcomes, in order to minimise the total mass of the structure, at
varying cross–section properties for each structural element, at given material features, under plastic admissibility constraints. The adopted evolutive elastic–plastic
algorithm, combined with optimisation tools, is proven to constitute an efficient
structural modelling paradigm and computational strategy, both from numerical and
design standpoints, allowing for general effective analyses of deployable satellite
antennas, even beyond the scopes of the investigation on the characteristic structural
sample here targeted
Practical Application of CAE in the Design Process of the Floating Stages of the Lakeside Festival in Bregenz - Austria
No full textAbstractThe design of modern and architecturally complex constructions in civil engineering can only be effectively achieved through the application of Computer-Aided Engineering (CAE). This requires, on the one hand the use of fully 3D CAD Systems during the architectural design process and on the other hand the use of fully 3D numerical calculation methods like the Finite Element Method (FEM) during the engineering construction process. The combination of the aforementioned CAE methods allows for the development of highly sophisticated structures. The practical application of these methods will be revealed by examining the floating stages of the lake festival in Bregenz/Austria, these stages are designed and built anew every second year. The aim is to show the development process from the initial designs up to the finished stage; a process made possible thanks to a close collaboration between designers and engineers
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