Search results for "TEIL"
showing 10 items of 437 documents
Study of scintillation light collection, production and propagation in a 4 tonne dual-phase LArTPC
2020
The $3 \times 1 \times 1$ m$^3$ demonstrator is a dual phase liquid argon time projection chamber that has recorded cosmic rays events in 2017 at CERN. The light signal in these detectors is crucial to provide precise timing capabilities. The performances of the photon detection system, composed of five PMTs, are discussed. The collected scintillation and electroluminescence light created by passing particles has been studied in various detector conditions. In particular, the scintillation light production and propagation processes have been analyzed and compared to simulations, improving the understanding of some liquid argon properties.
Adolf von Beckerin identtiset Ateljeessa-maalaukset – aitoja, kopioita vai väärennöksiä?
2021
Artikkelissa esittelemme kahden Adolf von Beckerin nimiin signeeratun Ateljeessa-teoksen tutkimusta taidehistorian, maalaustekniikan ja materiaalitutkimuksen näkökulmista. Samalla pyrimme tuomaan esiin mitä uutta moniammatillinen yhteistyö ja luonnontieteessä käytetyt menetelmät on tuoneet taideteosten tutkimukseen. Tutkimuksessa voitiin osoittaa, että toinen teoksista on alkuperäinen ja toinen on kopio siitä. Kopion maalaajaksi osoittautui Hilda Granstedt. Tutkimusmenetelminä käytettiin perinteisen arkistotutkimuksen lisäksi erilaisia sähkömagneettista säteilyä tallentavia kuvantamismenetelmiä, kuten röntgen-, ultravioletti- ja infrapunareflektiokuvausta, sekä materiaalianalyyttisiin menet…
First observation of a baryonic Bc+ decay
2014
A baryonic decay of the $B_c^+$ meson, $B_c^+\to J/\psi p\overline{p}\pi^+$, is observed for the first time, with a significance of $7.3$ standard deviations, in $pp$ collision data collected with the LHCb detector and corresponding to an integrated luminosity of $3.0$ fb$^{-1}$ taken at center-of-mass energies of $7$ and $8$ $\mathrm{TeV}$. With the $B_c^+\to J/\psi \pi^+$ decay as normalization channel, the ratio of branching fractions is measured to be \begin{equation*} \frac{\mathcal{B}(B_c^+\to J/\psi p\overline{p}\pi^+)}{\mathcal{B}(B_c^+\to J/\psi \pi^+)} = 0.143^{\,+\,0.039}_{\,-\,0.034}\,(\mathrm{stat})\pm0.013\,(\mathrm{syst}). \end{equation*} The mass of the $B_c^+$ meson is dete…
How representative are referendums? Evidence from 20 years of Swiss referendums
2017
Direct democracy allows citizens to reverse decisions made by legislatures and even initiate new laws which parliaments are unwilling to pass, thereby, as its proponents argue, leading to more representative policies than would have obtained under a purely representative democracy. Yet, turnout in referendums is usually lower than in parliamentary elections and tends to be skewed towards citizens of high socio-economic status. Consequently, critics of direct democracy argue that referendum outcomes may not be representative of the preferences of the population at large. We test this assertion using a compilation of post-referendum surveys encompassing 148 national referendums held in Switze…
Iron and pH regulating the photochemical mineralization of dissolved organic carbon
2017
Solar radiation mineralizes dissolved organic matter (DOM) to dissolved inorganic carbon through photochemical reactions (DIC photoproduction) that are influenced by iron (Fe) and pH. This study addressed as to what extent Fe contributes to the optical properties of the chromophoric DOM (CDOM) and DIC photoproduction at different pH values. We created the associations of Fe and DOM (Fe-DOM) that cover the range of loadings of Fe on DOM and pH values found in freshwaters. The introduced Fe enhanced the light absorption by CDOM independent of pH. Simulated solar irradiation decreased the light absorption by CDOM (i.e., caused photobleaching). Fe raised the rate of photobleaching and steepened…
Dosimetric effect of respiratory motion on planned dose in whole-breast volumetric modulated arc therapy using moderate and ultra-hypofractionation.
2021
Abstract Background and purpose The interplay effect of respiratory motion on the planned dose in free-breathing right-sided whole-breast irradiation (WBI) were studied by simulating hypofractionated VMAT treatment courses. Materials and methods Ten patients with phase-triggered 4D-CT images were included in the study. VMAT plans targeting the right breast were created retrospectively with moderately hypofractionated (40.05 Gy in 15 fractions of 2.67 Gy) and ultra-hypofractionated (26 Gy 5 fractions of 5.2 Gy) schemes. 3D-CRT plans were generated as a reference. All plans were divided into respiratory phase-specific plans and calculated in the corresponding phase images. Fraction-specific d…
Osallistumisesta dialogiin : taiteen, taitelijakäsityksen sekä osallistumisen tunnistamisesta dialogisessa estetiikassa
2019
Measuring music artist success
2012
Musiikkiteollisuudella on vuosikymmeniä kestäneet perinteet artistin menestyksen mittaamisessa. Mittaamisella on pyritty sekä monitoroimaan erilaisten musiikkiin liittyvien prosessien tuloksia ja vaikutuksia, sekä suunnittelemaan ja ohjaamaan artistin uraan liittyvää liiketoimintaa. Musiikkiteollisuus elää rajua murroskautta, jossa vanhat ansaintalogiikat ovet saaneet rinnalleen uusia tapoja tehdä liiketoimintaa ja markkinoiden muutos on myös muuttanut artistin menestyksen mittaamisen toimintamalleja. Musiikkia kuunnellaan tänä päivänä enemmän kuin koskaan ja tästä syystä alalle on syntynyt suuri tarve uusille, paremmin nykytilannetta vastaaville mittareille. Tämä Pro Gradu-tutkielma tarkas…
Impact of Terrestrial Neutrons on the Reliability of SiC VD-MOSFET Technologies
2021
Accelerated terrestrial neutron irradiations were performed on different commercial SiC power MOSFETs with planar, trench and double-trench architectures. The results were used to calculate the failure cross-sections and the failure in time (FIT) rates at sea level. Enhanced gate and drain leakage were observed in some devices which did not exhibit a destructive failure during the exposure. In particular, a different mechanism was observed for planar and trench gate MOSFETs, the first showing a partial gate rupture with a leakage path mostly between drain and gate, similar to what was previously observed with heavy-ions, while the second exhibiting a complete gate rupture. The observed fail…
On-line implementation and first operation of the Laser Ion Source and Trap at ISOLDE/CERN
2015
13 pags.; 12 figs.; 2 tab.; Open Access funded by CERN