Attractor Flows from Defect Lines

Deforming a two dimensional conformal field theory on one side of a trivial defect line gives rise to a defect separating the original theory from its deformation. The Casimir force between these defects and other defect lines or boundaries is used to construct flows on bulk moduli spaces of CFTs. It turns out, that these flows are constant reparametrizations of gradient flows of the g-functions of the chosen defect or boundary condition. The special flows associated to supersymmetric boundary conditions in N=(2,2) superconformal field theories agree with the attractor flows studied in the context of black holes in N=2 supergravity.Comment: 28 page

Neutrino telescope modelling of Lorentz invariance violation in oscillations of atmospheric neutrinos

One possible feature of quantum gravity may be the violation of Lorentz invariance. In this paper, we consider one particular manifestation of the violation of Lorentz invariance, namely modified dispersion relations for massive neutrinos. We show how such modified dispersion relations may affect atmospheric neutrino oscillations. We then consider how neutrino telescopes, such as ANTARES, may be able to place bounds on the magnitude of this type of Lorentz invariance violation

Robust persistence and permanence of polynomial and power law dynamical systems

A persistent dynamical system in $\mathbb{R}^d_{> 0}$ is one whose solutions have positive lower bounds for large $t$, while a permanent dynamical system in $\mathbb{R}^d_{> 0}$ is one whose solutions have uniform upper and lower bounds for large $t$. These properties have important applications for the study of mathematical models in biochemistry, cell biology, and ecology. Inspired by reaction network theory, we define a class of polynomial dynamical systems called tropically endotactic. We show that two-dimensional tropically endotactic polynomial dynamical systems are permanent, irrespective of the values of (possibly time-dependent) parameters in these systems. These results generalize the permanence of two-dimensional reversible, weakly reversible, and endotactic mass action systems.Comment: 26 pages, 11 figures. Version 3 clarifies some explanations and adds a detailed calculation to an example which clarifies how the result can be applie

Management and Service-aware Networking Architectures (MANA) for Future Internet Position Paper: System Functions, Capabilities and Requirements

Future Internet (FI) research and development threads have recently been gaining momentum all over the world and as such the international race to create a new generation Internet is in full swing: GENI, Asia Future Internet, Future Internet Forum Korea, European Union Future Internet Assembly (FIA). This is a position paper identifying the research orientation with a time horizon of 10 years, together with the key challenges for the capabilities in the Management and Service-aware Networking Architectures (MANA) part of the Future Internet (FI) allowing for parallel and federated Internet(s)

Ausgestaltung von Management by Objectives innerhalb von Leistungslohnsystemen: Unterschiede in der Motivation zwischen Mitarbeitenden und Managern

Management by Objectives (MbO) wird definiert als Synthese von Zielsetzung, Partizipation bei Zielvereinbarungen und Feedback über die Zielerreichung. Dieser Beitrag untersucht, wie sich die Ausgestaltung von MbO innerhalb von Leistungsvergütungssystemen auf die Motivation von Mitarbeitenden und Vorgesetzten auswirkt. Als Datenbasis dient eine Stichprobe von 342 Unternehmen in der Schweiz. Die Untersuchungsergebnisse zeigen, dass 96% der betrachteten Leistungslohngruppen Management by Objectives anwenden. Bei 83% ist die Leistungsvergütung direkt mit dem MbO-System verknüpft. Eine detaillierte Betrachtung zeigt, dass die Ausgestaltung der einzelnen Elemente von MbO – Zielsetzung, Partizipation und Feedback – je nach Hierarchiestufe verschiedene Bedeutungen haben. Während für die Mitarbeitenden ohne Führungsfunktion in erster Linie die Kommunikation über die Zielerreichung einen positiven Einfluss auf die Motivation hat, ist für das Management die Qualität der Zielsetzungen zentral

Fatigue delamination behaviour of unidirectional carbon fibre/epoxy laminates reinforced by Z-Fiber® pinnin

-Pin reinforced carbon-fibre epoxy laminates were tested under Mode I and Mode II conditions, both quasi-statically and in fatigue. Test procedures were adapted from existing standard or pre-standard tests. Samples containing 2% and 4% areal densities of carbon-fibre Z-pins (0.28mm diameter) were compared with unpinned laminates. Quasi-static tests under displacement control yielded a dramatic increase of the apparent delamination resistance. Specimens with 2% pin density failed in Mode I at loads 170N, equivalent to an apparent GIC of 2kJ/m2. Fatigue testing under load control showed that the presence of the through- thickness reinforcement slowed down fatigue delamination propagation