Nonlinear effects in the propagation of optically generated magnetostatic volume mode spin waves

Recent experimental work has demonstrated optical control of spin wave emission by tuning the shape of the optical pulse (Satoh et al.\ Nature Photonics, 6, 662 (2012)). We reproduce these results and extend the scope of the control by investigating nonlinear effects for large amplitude excitations. We observe an accumulation of spin wave power at the center of the initial excitation combined with short-wavelength spin waves. These kind of nonlinear effects have not been observed in earlier work on nonlinearities of spin waves. Our observations pave the way for the manipulation of magnetic structures at a smaller scale than the beam focus, for instance in devices with all-optical control of magnetism.Comment: Added new figures to further illustrate the nonlinear effects to show time evolution and spectral flow. Added references. Changed perspective on nonlinear effects w.r.t. applicability of NSE. Added acknowledgemen

Merger Simulation in a Two-Sided Market: The Case of the Dutch Daily Newspapers

We develop a structural econometric framework that allows us to simulate the effects of mergers among two-sided platforms selling differentiated products. We apply the proposed methodology to the Dutch newspaper industry. Our structural model encompasses demands for differentiated products on both sides of the market and profit maximization by competing oligopolistic publishers who choose subscription and advertising prices, while taking the interactions between the two-sides of the market into account. We measure the sign and size of the indirect network effects between the two sides of the market and simulate the effects of a hypothetical merger on prices and welfare

Performance of the track matching

The procedure and the performance of the track matching algorithm at the time of DC'06 is described. The event-weighted efficiency is 79.3 % for all long tracks increasing to 86 % for tracks with p>5 GeV. An approach to tune the matching algorithm with real data is presented and a discussion on future improvements to the algorithm given

Simulation Application for the LHCb Experiment

We describe the LHCb detector simulation application (Gauss) based on the Geant4 toolkit. The application is built using the Gaudi software framework, which is used for all event-processing applications in the LHCb experiment. The existence of an underlying framework allows several common basic services such as persistency, interactivity, as well as detector geometry description or particle data to be shared between simulation, reconstruction and analysis applications. The main benefits of such common services are coherence between different event-processing stages as well as reduced development effort. The interfacing to Geant4 toolkit is realized through a facade (GiGa) which minimizes the coupling to the simulation engine and provides a set of abstract interfaces for configuration and event-by-event communication. The Gauss application is composed of three main blocks, i.e. event generation, detector response simulation and digitization which reflect the different stages performed during the simulation job. We describe the overall design as well as the details of Gauss application with a special emphasis on the configuration and control of the underlying simulation engine. We also briefly mention the validation strategy and the planing for the LHCb experiment simulation.Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003, 6 pages, LaTeX, 9 eps figures. PSN TUMT00

De ingekorte schaal voor algemene, emotionele en sociale eenzaamheid

Eenzaamheid wordt algemeen beschouwd als belangrijke indicator van sociaal welbevinden en betreft gevoelens verbonden aan het missen van een intieme relatie (emotionele eenzaamheid) en/of een tekort en gemis betreffende het bredere sociale netwerk (socialeenzaamheid). De 11-item De Jong Gierveld schaal is uitgebreid getoetst en daarvan is bewezen dat het een valide en betrouwbaar meetinstrument vormt voor eenzaamheid in het algemeen, maar ook voor emotionele en sociale eenzaamheid. De lengte van deze schaal vormde soms een bezwaar voor gebruik in grootschalige survey’s. In deze studie wordt de kwaliteit van een verkorte versie van deze schaal getoetst in nieuwe survey’s (N = 9448). Toetsende factoranalyses onderbouwen de twee latente factoren. Congruente validiteit en de samenhang met verschillende determinanten (partnerstatus, gezondheid) bleken optimaal te zijn. De 6-item De Jong Gierveld schaal kan in grootschalige survey’s worden ingezet als een betrouwbaar en valide meetinstrument voor emotionele en sociale eenzaamheid, alsook voor eenzaamheid in het algemeen