77,331 Works

On the use of mode shape curvatures for damage localization under varying environmental conditions

Yaser Shokrani, Vasilis K. Dertimanis, Eleni Chatzi & Marco N. Savoia
A novel damage localization method is introduced in this study, which exploits mode shape curvatures as damage features, while accounting for operational variability. The developed framework operates in an output‐only regime,that is, it does not assume availability of records from the influencing environmental/operational quantities but rather from response quantities alone. The introduced tool comprises 3 stages pertaining to training, validation, and diagnostics. During the training stage, a representation of the healthy, or baseline, structural state...

On the use of mode shape curvatures for damage localization under varying environmental conditions

Yaser Shokrani, Vasilis K. Dertimanis, Eleni Chatzi & Marco N. Savoia
A novel damage localization method is introduced in this study, which exploits mode shape curvatures as damage features, while accounting for operational variability. The developed framework operates in an output‐only regime,that is, it does not assume availability of records from the influencing environmental/operational quantities but rather from response quantities alone. The introduced tool comprises 3 stages pertaining to training, validation, and diagnostics. During the training stage, a representation of the healthy, or baseline, structural state...

Particle filters for high-dimensional geoscience applications: A review

Peter J. Van Leeuwen, Hans R. Künsch, Lars Nerger, Roland Potthast & Sebastian Reich
Quarterly Journal of the Royal Meteorological Society, 145 (723)

Particle filters for high-dimensional geoscience applications: A review

Peter J. Van Leeuwen, Hans R. Künsch, Lars Nerger, Roland Potthast & Sebastian Reich
Particle filters contain the promise of fully nonlinear data assimilation. They have been applied in numerous science areas, including the geosciences, but their application to high‐dimensional geoscience systems has been limited due to their inefficiency in high‐dimensional systems in standard settings. However, huge progress has been made, and this limitation is disappearing fast due to recent developments in proposal densities, the use of ideas from (optimal) transportation, the use of localization and intelligent adaptive resampling...

Particle filters for high-dimensional geoscience applications: A review

Peter J. Van Leeuwen, Hans R. Künsch, Lars Nerger, Roland Potthast & Sebastian Reich
Particle filters contain the promise of fully nonlinear data assimilation. They have been applied in numerous science areas, including the geosciences, but their application to high‐dimensional geoscience systems has been limited due to their inefficiency in high‐dimensional systems in standard settings. However, huge progress has been made, and this limitation is disappearing fast due to recent developments in proposal densities, the use of ideas from (optimal) transportation, the use of localization and intelligent adaptive resampling...

Particle filters for high-dimensional geoscience applications: A review

Peter J. Van Leeuwen, Hans R. Künsch, Lars Nerger, Roland Potthast & Sebastian Reich
Particle filters contain the promise of fully nonlinear data assimilation. They have been applied in numerous science areas, including the geosciences, but their application to high‐dimensional geoscience systems has been limited due to their inefficiency in high‐dimensional systems in standard settings. However, huge progress has been made, and this limitation is disappearing fast due to recent developments in proposal densities, the use of ideas from (optimal) transportation, the use of localization and intelligent adaptive resampling...

On the use of mode shape curvatures for damage localization under varying environmental conditions

Yaser Shokrani, Vasilis K. Dertimanis, Eleni N. Chatzi & Marco N. Savoia
A novel damage localization method is introduced in this study, which exploits mode shape curvatures as damage features, while accounting for operational variability. The developed framework operates in an output‐only regime,that is, it does not assume availability of records from the influencing environmental/operational quantities but rather from response quantities alone. The introduced tool comprises 3 stages pertaining to training, validation, and diagnostics. During the training stage, a representation of the healthy, or baseline, structural state...

Long-term variations of solar activity and their impacts: The modulating role of atmospheric chemistry

Stefan Muthers, Christoph C. Raible, Eugene Rozanov & Thomas F. Stocker
The influence of reduced solar forcing (grand solar minimum or geoengineering scenarios like solar radiation management) on the Atlantic Meridional Overturning Circulation (AMOC) is assessed in an ensemble of atmosphere–ocean–chemistry–climate model simulations. Ensemble sensitivity simulations are performed with and without interactive chemistry. In both experiments the AMOC is intensified in the course of the solar radiation reduction, which is attributed to the thermal effect of the solar forcing: reduced sea surface temperatures and enhanced sea...

Social Cognition and Interaction in Chronic Users of 3,4-Methylenedioxymethamphetamine (MDMA, \"Ecstasy\")

Michael D. Wunderli, Matthias Vonmoos, Lorena Treichler, Carmen Zeller, Isabel Dziobek, Thomas Kraemer, Markus R. Baumgartner, Erich Seifritz & Boris B. Quednow
Background The empathogen 3,4-methylenedioxymethamphetamine (MDMA) is the prototypical prosocial club drug inducing emotional openness to others. It has recently been shown that acutely applied 3,4-MDMA in fact enhances emotional empathy and prosocial behavior, while it simultaneously decreases cognitive empathy. However, the long-term effects of 3,4-MDMA use on socio-cognitive functions and social interactions have not been investigated yet. Therefore, we examined emotional and cognitive empathy, social decision-making, and oxytocin plasma levels in chronic 3,4-MDMA users. Methods...

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