13 research outputs found
A mesoscopic approach for draping simulation of preforms manufactured by direct fibre placement
No full textRethinking Shelving: Making Your Children’s Collections User-Friendly
No full textIt was the princesses that did it. About five years ago it seemed like every day a different little girl would come up to the children’s desk and want help finding picture books about princesses. I could do pretty well with trucks and trains because I knew enough books by author and could jump from Barton to Crews to McMullen until I found one. But I only knew a few princess books, and they were always checked out. And that was the final straw that led us to create our “Picture Book Topics” section. Soon we had a new “Pink” section filled with princesses, mermaids, and stories about girls who like sparkly things. It became and remains one of the most heavily used collections in the library.
We’ve added other new sections to our children’s collection in the past five years, including leveled early readers, a “Non-Fiction Series” area, and fiction staff picks by grade level and genre. All of the changes were spurred by asking a few basic questions about what happens at the Children’s Desk:
• How do kids (and sometimes their grownups) describe the books they want?
• Do we arrange the collection in ways that match those descriptions?
• If our collection arrangement doesn’t match a user’s questions, can we change it
Experimental Techniques
No full text. In this course we will give examples for experimental techniques used in particle physics experiments. After a short introduction, we will discuss applications in silicon microstrip detectors, wire chambers, and single photon detection in Ring Imaging Cherenkov (RICH) counters. A short discussion of the relevant physics processes, mainly different forms of energy loss in matter, is enclosed. INTRODUCTION In this course we will not try to reproduce standard text books about detectors (see for example [1,2]) and descriptions of interaction with matter (a good summary can be found in [3]), covering in great details all aspects of experimental high energy physics. Due to the time restrictions (3 \Theta 50 min were assigned by the organizers for this course) we will rather discuss examples on the use of some detector families. The selection is highly biased, since the author decided to use examples he knows best, e.g. he either worked on some of the detectors directly, or they were ..
Zeit- und kosteneffiziente Prozess- und Produktentwicklung für den Hochleistungs-Faserverbundleichtbau mittels Nasspresstechnologie
No full textGroßserientaugliche Produktionsprozesse von Hochleistungs-Faserverbundkunststoffen stellen aufgrund der gewünschten Prozesseffizienz bei gleichzeitiger Realisierung herausragender gewichtsspezifischer Materialeigenschaften ein wichtiges, zukunftsträchtiges Themenfeld dar. Im Automotive-Bereich kommen diese Prozesse verstärkt zur Anwendung, insbesondere bei Premiumfahrzeugen und im Rahmen der E Mobilität. Der erheblichen Gewichtseinsparung und hohen Energieeffizienz von Leichtbaustrukturen stehen bisher jedoch noch hohe Entwicklungs- und Stückkosten (Material, Prozessaufwand) gegenüber. Neben den verschiedenen Varianten der Resin Transfer Moulding (RTM) Technologie bietet sich zur Herstellung leichter, komplex geformter Strukturbauteile das Nasspressverfahren als Großserienanwendung an. Durch Parallelisierung von Prozessschritten in Verbindung mit hochreaktiven Harzsystemen können niedrigere Zykluszeiten erreicht werden als beim RTM-Verfahren. Da für den Nasspressprozess bisher weder ein umfassendes physikalisch-basiertes Prozessverständnis, noch Methoden zur virtuellen Prozesssimulation und -optimierung existieren, besteht ein erheblicher Forschungsbedarf für eine ressourceneffiziente Prozess- und Bauteilentwicklung [1].
Die Forschungsbrücke „KIT – Uni Stuttgart“ baut auf der langjährigen wissenschaftlichen und strategischen Zusammenarbeit der Leichtbau-Institute des Karlsruher Instituts für Technologie (KIT-FAST) und der Universität Stuttgart (IFB Stuttgart) auf und widmet sich der Erforschung und Weiterentwicklung des Nasspressprozesses (vgl. Abbildung 1). Dabei werden zwei unterschiedliche Prozessrouten grundlegend untersucht, modelliert, optimiert und bewertet. Besondere Herausforderungen sind die fundierte Material- und Prozessanalyse der Nasspresstechnologie sowie die Methodenentwicklung zur effizienten, virtuellen Prozess- und Bauteilentwicklung und die ganzheitliche Optimierung
ChPT tests at NA62
No full textThe NA62 experiment at CERN SpS collected a large sample of charged kaon decays with a low intensity beam and minimum bias trigger conditions in 2007. This allowed measurements of a number of rare decays that are difficult to address in conventional high intensity experiments with highly selective trigger conditions. In particular, large samples of K± →π±γ γ and K± →e± νγ decays have been collected, allowing precision tests of the Chiral Perturbation Theory. The status and first results of these analyses are presented. © Copyright owned by the author(s)
ChPT tests at NA62
No full textThe NA62 experiment at CERN SpS collected a large sample of charged kaon decays with a low intensity beam and minimum bias trigger conditions in 2007. This allowed measurements of a number of rare decays that are difficult to address in conventional high intensity experiments with highly selective trigger conditions. In particular, large samples of K± →π±γ γ and K± →e± νγ decays have been collected, allowing precision tests of the Chiral Perturbation Theory. The status and first results of these analyses are presented. © Copyright owned by the author(s)
Searches for lepton number violating K+→π− (π0)e+e+ decays
No full textSearches for lepton number violating K+ -> pi(-)e(+)e(+) and K+ -> pi(-)pi(0)e(+)e(+) decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016-2018. Upper limits of 5.3 x 10(-11 )and 8.5 x 10(-10) are obtained on the decay branching fractions at 90% confidence level. The former result improves by a factor of four over the previous best limit, while the latter result represents the first limit on the K+ -> pi(-)pi(0)e(+)e(+) decay rate. (C) 2022 The Author. Published by Elsevier B.V
Searches for rare and forbidden kaon decays at the NA62 experiment at CERN
No full textThe NA62 experiment at the CERN SPS aims at measuring the branching ratio (BR) of the rare K+ → π+vv̄ decay, with a precision of ∼ 10%. This goal will be achieved after two years of data taking by collecting ∼ 1013 K+ decays in the fiducial volume. The K+ → π+vv̄ is a "golden mode" in flavor physics because of the precise theoretical prediction. Thanks to the unprecedent kaon flux, it will also be possible to search for many other forbidden processes, including leptor flavor violation modes, sterile neutrinos, supersymmetric particles. The expected NA62 performances will wallow the exclusion limits for several decay modes to be improved. The experiment will start collecting data in late 2014. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence
Study of leptonic and semileptonic kaon decays at CERN
No full textDuring 2003 and 2004, the NA48/2 experiment has collected at the CERN SPS the world largest amount of charged kaon decays, with the main goal to search for direct CP violation in the decay of K± into three pions. From a dedicated data sample collected in 2004, the analysis of K ±e3 and K±μ3 decay data has allowed precise measurements of the form factors in various parametrizations. Later, in 2007-2008, using the same detector but a modified beam and trigger logic, the NA62 experiment has taken data to measure the ratio of K → ev and K → v leptonic decays and has obtained a sub-percent measurement of the ratio RK = Γ(Ke2)/Γ(K μ2). © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence
