1,006 Works

Interoperability and reuse with identifiers

Egon L. Willighagen
Names have helped researchers connect knowledge about those things. Names, however, are not trivial to recognize for humans and machines alike and can get very long when more information is included. This is clear for IUPAC names for chemical structures: while they are machine readable, they are long and not unique either. Short names and codes are abundantly used to overcome this approach, and this includes identifiers. When global and unique they allows us to...

The frozen phase of F-theory

Alessandro Tomasiello

Conference Summary, II: Chow Groups, Fluxes, and Massless Matter in F-Theory

Sakura Schafer-Nameki & Timo Weigand

Elliptic fibrations on K3 surfaces with large Picard rank

Andreas Malmendier
In this talk, we give an explicit description for the relation between algebraic Kummer surfaces of Jacobians of genus-two curves with principal polarization and those associated to (1, 2)-polarized abelian surfaces from three different angles: the point of view of 1) the binational geometry of quartic surfaces in P^3 using even-eights, 2) elliptic fibrations on K3 surfaces of Picard-rank 17 over P^1 using Nikulin involutions, 3) theta-functions of genus-two using two-isogeny. Finally, we will explain...

Singular elliptic fibers at codimension two and representation theory of matter in F-theory models, II

Antonella Grassi

Singular elliptic fibers at codimension two and representation theory of matter in F-theory models, I

Washington Taylor

Mordell—Weil lattice and the global gauge group of F-theory

Ling Lin
The global gauge group structure of F-theory compactifications is tied to the embedding of the Mordell—Weil lattice into the Neron—Severi group, also known as the Shioda map. While this has been previously explored in the case of purely non-abelian gauge algebras, I will extend it to the more general case by including u(1)s. In particular, I will discuss phenomenological implications, such as the natural realization of the full Standard Model gauge group or possible implications...

Six-dimensional Theories, Topological Strings, and Modular Invariance

Michele Del Zotto
In the past six years, several efforts have been directed towards developing a dictionary in between the physics of six-dimesional theories and the algebraic geometry of elliptically-fibered Calabi-Yau three-folds, building upon methods in string theory. This has lead to novel results in enumerative geometry as well, in particular, the Gopakumar-Vafa invariants of the topological string of such Calabi-Yau varieties translate to an operator counting in the six-dimensional theory. This gives an unorthodox perspective on topological...

Classification of bases and the global set of elliptic Calabi-Yau threefolds and fourfolds, I

Antonella Grassi

Zoology of complex threefold bases in F-theory

Yi-Nan Wang
I'm going to present algorithms that explicitly generate a large number of topologically distinct smooth toric threefold bases used in 4D F-theory compactification. We found inherent patterns in these bases although they are seemingly random. I'll also talk about the characterization of these bases using local geometric data and non-Higgsable gauge group structure. Finally, I'm going to briefly mention our current understanding of non-toric base threefolds.

Constructing and leveraging a continental-scale open earth observation data cube: The EcoDataCube platform

Martijn Witjes
Martijn will present OpenGeoHub’s efforts at creating a harmonized, multi-source spatiotemporal data cube for Europe, and how this data cube was used to produce consistent continental annual land use/ land cover maps. He will also show you around the EcoDataCube platform that hosts the data cube and the land cover maps!


Stefan Jetschny
F.A.I.R. Information Cubes – FAIRiCUBE aims to enable players from beyond classic Earth Observation (EO) domains to provide, access, process, and share gridded data and algorithms in a FAIR and TRUSTable manner. This project’s goal is to leverage the power of Machine Learning (ML) operating on multi-thematic datacubes for a broader range of governance and research institutions from diverse fields, which at present cannot easily access and utilize these potent resources. At the workshop organized...

Simple mechanisms for not-so-simple decisions

Jan Drugowitsch
Continual perceptual processing, such as required for decisions that necessitate the accumulation of evidence over time, is essential for efficient behavior. The behavior emerging from a wide range of such decisions turns out to be well-described by a surprisingly simple model family - the diffusion decision model. Taking a decision-theoretical perspective, I will discuss why diffusion models might have this property across perceptual and value-based decisions. I furthermore will highlight scenarios in which such simple...

The nervous system controls afferented muscles, which makes it a simultaneously over- and over-determined problem

Francisco Valero-Cuevas

Fast and physiologically realistic predictive simulations of healthy and pathological human movement

Friedl De Groote
Predictive simulations hold the potential to greatly expedite advances in understanding healthy and pathological movement. We developed a computationally efficient framework to predict human movement based on optimization of a performance criterion. The framework generates three-dimensional muscle-driven simulations, without relying on experimental data, in about 36 minutes on a standard laptop—more than 20 times faster than existing simulations—by using direct collocation, implicit differential equations, and algorithmic differentiation. The simulations produce physiologically realistic gaits with varied...

FAIR nanosafety data for nanoinformatics

Penny Nymark
The scale and opportunities of nanoinformatics depends on Findable, Accessible, Interoperable and Reusable (FAIR) data. The FAIR guiding principles were designed by the informatics community to harmonize and advance the ability of machines to find and reuse data, while simultaneously supporting human readability. The complexity and wide variety of data derived from nanomaterials and their interactions with their surroundings has brought diverse challenges for harmonized naming, describing, and representation of the data, in order to...

Instability of peaked waves

Dmitry Pelinovski
It is well-known that peakons in the Camassa-Holm equation and other integrable generalizations of the KdV equation are H1-orbitally stable thanks to the presence of conserved quantities and properties of peakons as constrained energy minimizers. By using the method of characteristics, we prove that piecewise C1 perturbations to peakons grow in time in spite of their stability in the H1-norm. We also show that the linearized stability analysis near peakons contradicts the H1-orbital stability result...

Tejedoras en Ahuiran - Michoacán, México

Beate Engelbrecht & Ulrike Keyser
Die Weberinnen von Ahuiran stellen mit Rückengürtelwebgeräten schwarzblaue Rebozos und weiße Tücher her. Besonders wenn die Ehemänner abwesend sind, sind sie auf den Verdienst aus ihrem Handwerk angewiesen. Die finanzielle Lage der Weberinnen wie auch der Käuferinnen führte dazu, daß statt der Baumwolle immer mehr Acrylwolle benutzt wird. Die Frauen arbeiten oft in Gemeinschaft und unterhalten sich dabei. Sie nehmen die Hilfe ihrer Töchter in Anspruch, die so das Handwerk nach und nach erlernen. Verkauft...

The stability of periodic solutions of integrable equations

Bernard Deconinck
A surprisingly large number of physically relevant dispersive partial differential equations are integrable. Using the connection between the spectrum and the eigenfunctions of the associated Lax pair and the linear stability problem, we investigate the stability of the spatially periodic traveling wave solutions of such equations, extending the results to orbital stability in those case where solutions are linearly stable. The talk will emphasize recent results for the focusing NLS equation, as this situation is...

The Sphere Covering Inequality and Its Applications

Amir Moradifam
We show that the total area of two distinct Gaussian curvature 1 surfaces with the same conformal factor on the boundary, which are also conformal to the Euclidean unit disk, must be at least 4π. In other words, the areas of these surfaces must cover the whole unit sphere after a proper rearrangement. We refer to this lower bound of total areas as the Sphere Covering Inequality. This inequality and it’s generalizations are applied to...

Homogeneous axisymmetric solutions of incompressible stationary Navier-Stokes equations and vanishing viscosity limit

Yanyan Li
We present results on the existence of (-1)-homogeneous axisymmetric solutions of incompressible stationary Navier-Stokes equations which are smooth on the unit sphere minus the north and south poles. In particular we classify such solutions with no swirl, and analyze their limiting behavior as viscosity tends to zero.

Entire solutions for Liouville systems

Luca Battaglia
I will consider a system of two coupled Liouville equations on the plane. The system admits so-called scalar solutions, namely such that the two components coincide. These solutions actually solve a scalar Liouville equation on the plane, hence they are very well known and they have been completely classified. On the other hand, much less is known about non-scalar solutions. Using bifurcation theory, I will show the existence of some branches of (non-scalar) solutions bifurcating...

Logistics - Making Trade Between Germany and Turkey Work

Philip Verfürth
This video explains the role of logistics in Global Production Networks. Examples of logistics between Germany and Turkey are given.

Regional Disparities in Germany - Part I

Philip Verfürth
In this video, regional disparities in Germany are addressed. It discusses exemplarily which factors influence the disparities and with which measures politics responds to regional disparities.

Continuum Modeling of Powder Flow, Blending, and Segregation

Carl Wassgren
This talk will present recent work investigating the use of elasto-plastic continuum models for predicting the flow behavior of particulate materials. Several constitutive relations have been implemented in a commercial finite element method (FEM) software package to predict flow and stress fields in hoppers and tumbling blenders. The stress and velocity fields and mass flow rates match well with other widely accepted models and correlations. Particle mixing and segregation are incorporated by coupling the FEM-predicted...

Registration Year

  • 2023

Resource Types

  • Audiovisual
  • Collection