150 research outputs found
Vom Start-up zum KMU : Ist-Stand – Veränderung – Ausblick am Beispiel der ENPULSION GmbH
No full textThis master thesis examines the current status and the change of the high-tech start-up ENPULSION GmbH in the field of organizational development.
The author of the thesis has been actively involved in the development process of the company since its foundation in 2016 and reflects on selected situations in the context of intervention research.
The central research question of this thesis, which interventions have been set since the foundation of the company and with which goal, is not a narrowly defined question. It is much more the framework for the analysis, based on the results of the experienced and designed development process. The most relevant interventions - from the author's perspective - that had the greatest impact in terms of changing structures and roles in the company were selected. The basis for this was the logbook kept by the author since the beginning of his work at ENPULSION, in which interventions, events and important observations were documented parallel to the organizational development process.
The analysis of the selected interventions clearly shows that they were individual steps, adapted to the needs of the system/organization ENPULSION. These interventions each pursued a specific goal and did not serve to entertain the team members, but had a purpose/meaning that provided clarity regarding the fulfillment of the end result. In the spirit of Kotter, the set interventions did not just fall from the sky, but emerged out of urgency.
The central, generally valid conclusion for designing successful change - especially in the sense of setting interventions - is the indispensable, individual examination of a company. If organizational development is understood as a driving element of change that should actually make a difference and not just as a description of the past.Masterarbeit Wien, Fachhochschule des BFI Wien 202
Portfoliooptimierung eines österreichischen Wasserkrafterzeugers – Optimaler Einsatz der Kraftwerksflexibilitäten am Stundenprodukt- und Regelenergiemarkt
No full textMeasurement of the prompt χc1 and χc2 polarizations at CMS
No full textDie Bildung von Bindungszuständen aus Quarks, sogenannte Hadronen, durch die starke Wechselwirkung ist noch nicht vollständig verstanden. Quarkonia sind Bindungszustände aus einem Quark und seinen Antiquark (qq) und stellen ideale Versuchsobjekte zur Untersuchung der Produktionsmechanismen von Hadronen dar. In der momentan gängigen theoretischen Beschreibung im Zuge der Nicht-Relativistischen QuantenChromodynamik (NRQCD) wird die Entstehung von Quarkonia in die Entstehung eines anfänglichen qq Paares und dessen darauf folgende Entwicklung zu einem gebundenen Zustand faktorisiert. Während der erste Schritt im Rahmen von perturbativen Methoden der QCD berechenbar ist, werden für den zweiten Schritt experimentelle Messungen der Produktionswechselwirkungsquerschnitte und der Polarisation von Quarkonia benötigt. Seit dem Start des Large Hadron Collider (LHC) Programmes sind eine Vielzahl an solchen Quarkonium Messungen veröffentlicht worden. Die Eigenschaften der S-Wellen Zustände sind mittlerweile, vor allem bei zentraler Rapidität und hohen transversen Impulsen, sehr gut vermessen. Andererseits existieren nur wenige experimentelle Resultate für P-Wellen Zustände. Insbesondere die Polarisation dieser Zustände wurde bisher nicht gemessen. Phänomenologische Studien haben, aufbauend auf den veröffentlichten Resultaten der LHC Experimente, überraschend einfache Muster in der Entstehung von Quarkonia gefunden. Diese Muster befinden sich im krassen Gegensatz zu den komplexen Mischungen aus Prozessen die in der NRQCD berücksichtigt werden. Trotzdem stimmen Berechnungen und Messungen sehr gut überein. Die Studien machen eine klare Vorhersage für die Polarisation der c1 und c2 Mesonen: Sie sind groß und vor allem entgegengesetzt. In dieser Dissertation wird die erste Polarisationsmessung der prompten c1 und c2 Mesonen präsentiert. Dafür werden Daten verwendet die 2012 vom CMS experiment am LHC in Proton-Proton Kollissionen bei einer Schwerpunktsenergie von s = 8 TeV gesammelt wurden und einer integrierten Luminosität von 19.1 fb1 entsprechen. Die c Mesonen werden über ihren Strahlungszerfall c J/ rekonstruiert. Hierbei, wird das Photon verwendet um zwischen c1 und c2 Zuständen zu unterscheiden. Eine Messung der Verhältnisse der Produktionswechselwirkungsquerschnitte der c2 im Verglich mit den c1 Zuständen als Funktion des polaren und azimuthalen Winkels des Myonzerfalles des J/ wird verwendet um die relative Polarisation zu bestimment. Die Parameter (c2) (c1) und (c2) (c1), zusammen mit unteren Grenzen für den Parameter (c1), werden in drei Bereichen des transversen Impulses des J/, 812, 1218 und 1830 GeV, gemessen. Für den azimuthalen Polarisationsunterschied, werden keine signifikant von Null verschiedene Werte gemessen. Die Resultate für , hingegen, deuten auf starke und gegensätzliche polare Polarisationen hin. Vergleiche der Messungen mit analytischen Kurven zeigen, dass ein unpolariertes Szenario, in dem beide Zustände die gleiche Polarisation aufweisen, unwahrscheinlich ist, während die Messungen mit den Vorhersagen auf Basis der NRQCD übereinstimmt.The process of how quarks are bound into hadrons by the strong interaction is not yet fully understood. Quarkonia, bound states of a heavy quark and its antiquark (qq), are ideal probes to study hadron formation. In the currently prevalent theoretical framework of Non-Relativistic Quantum Chromodynamics (NRQCD) the production of quarkonia is factorized into two separate steps, the formation of an initial qq pair and its subsequent evolution into the bound quarkonium state. While the first part can be calculated within perturbative QCD, the second step depends on inputs from experiments, quarkonium cross section and polarization measurements. With the advent of the Large Hadron Collider (LHC) physics program a multitude of quarkonium cross section and polarization measurements has recently become available. While the cross sections and polarizations of all S-wave states are by now well measured, especially at mid-rapidity and high transverse momenta, experimental results on P-wave states are scarce. In particular, no measurements of the polarization for any P-wave state exists. Phenomenological studies using the published results of the LHC experiments have observed remarkably simple patterns in the production of the studied quarkonia. These are in striking contrast with the complexity of the mixture of processes that are considered in the NRQCD approach. Nevertheless, calculations made within the NRQCD framework are able to reproduce the measurements very well. This seeming disparity between the simplicity of the data and the complexity of the theory comes with a clear-cut prediction, the polarizations of the c1 and c2 mesons should be large and, more importantly, opposite. This dissertation presents the first measurement of the polarizations of the prompt c1 and c2 mesons using data collected in 2012 by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of s = 8 TeV corresponding to a total integrated luminosity of 19.1 fb1 . The c mesons are reconstructed via their radiative c J/ decay, where the photon is used to identify the c1 and c2 states. A measurement of the relative polarization in the helicity frame is performed via the analysis of c2 over c1 cross section ratios as a function of the polar and azimuthal angle of the dimuon decay of the associated J/. The parameters (c2) (c1) and (c2) (c1) are reported together with lower bounds for the parameter (c1) in three ranges of J/ transverse momentum, 812, 1218 and 1830 GeV. While no significant deviation from zero is found for the azimuthal anisotropy dif- ference, , the results for suggest strong and opposite polar anisotropies for the prompt c1 and c2 mesons. A comparison of the measured cross section ratios with the expected analytic shapes reveals that the measurement disfavors the unpolarized scenario, where both states have the same polarization, but is in agreement with the NRQCD prediction
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No full textObjectiveThe purpose of this research is to identify how data science is applied in suicide prevention literature, describe the current landscape of this literature and highlight areas where data science may be useful for future injury prevention research.DesignWe conducted a literature review of injury prevention and data science in April 2020 and January 2021 in three databases.MethodsFor the included 99 articles, we extracted the following: (1) author(s) and year; (2) title; (3) study approach (4) reason for applying data science method; (5) data science method type; (6) study description; (7) data source and (8) focus on a disproportionately affected population.ResultsResults showed the literature on data science and suicide more than doubled from 2019 to 2020, with articles with individual-level approaches more prevalent than population-level approaches. Most population-level articles applied data science methods to describe (n=10) outcomes, while most individual-level articles identified risk factors (n=27). Machine learning was the most common data science method applied in the studies (n=48). A wide array of data sources was used for suicide research, with most articles (n=45) using social media and web-based behaviour data. Eleven studies demonstrated the value of applying data science to suicide prevention literature for disproportionately affected groups.ConclusionData science techniques proved to be effective tools in describing suicidal thoughts or behaviour, identifying individual risk factors and predicting outcomes. Future research should focus on identifying how data science can be applied in other injury-related topics.CC999999/ImCDC/Intramural CDC HHSUnited States
Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at √sNN = 2.76 TeV
No full textMeasurements from the CMS experiment at the LHC of dihadron correlations for charged particles produced in PbPb collisions at a nucleon–nucleon centre-of-mass energy of 2.76 TeV are presented. The results are reported as a function of the particle transverse momenta (pT) and collision centrality over a broad range in relative pseudorapidity (Δη) and the full range of relative azimuthal angle (Δφ). The observed two-dimensional correlation structure in Δη and Δφ is characterised by a narrow peak at (Δη,Δφ) ≈ (0, 0) from jet-like correlations and a long-range structure that persists up to at least |Δη| = 4. An enhancement of the magnitude of the short-range jet peak is observed with increasing centrality, especially for particles of pT around 1–2 GeV/c. The long-range azimuthal dihadron correlations are extensively studied using a Fourier decomposition analysis. The extracted Fourier coefficients are found to factorise into a product of single-particle azimuthal anisotropies up to pT ≈ 3–3.5 GeV/c for at least one particle from each pair, except for the second-order harmonics in the most central PbPb events. Various orders of the single-particle azimuthal anisotropy harmonics are extracted for associated particle pT of 1–3 GeV/c, as a function of the trigger particle pT up to 20 GeV/c and over the full centrality range
Study of the inclusive production of charged pions, kaons, and protons in pp collisions at √s = 0.9, 2.76, and 7 TeV
No full textSpectra of identified charged hadrons are measured in pp collisions at the LHC for √s = 0.9, 2.76, and 7 TeV. Charged pions, kaons, and protons in the transverse-momentum range pT ≈ 0.1–1.7 GeV/c and for rapidities |y| < 1 are identified via their energy loss in the CMS silicon tracker. The average pT increases rapidly with the mass of the hadron and the event charged-particle multiplicity, independently of the center-of-mass energy. The fully corrected pT spectra and integrated yields are compared to various tunes of the PYTHIA 6 and PYTHIA 8 event generators
Observation of Two Excited B+c States and Measurement of the B+c (2S) Mass in pp Collisions at √s = 13 TeV
No full textSignals consistent with the B-c(+)(2S) and B-c*(+)(2S) states are observed in proton-proton collisions at root s = 13 TeV, in an event sample corresponding to an integrated luminosity of 143 fb(-1), collected by the CMS experiment during the 2015-2018 LHC running periods. These excited (b) over barc states are observed in the B-c(+)pi(+)pi(-) invariant mass spectrum, with the ground state B-c(+) reconstructed through its decay to J/psi pi(+). The two states are reconstructed as two well-resolved peaks, separated in mass by 29.1 +/- 1.5(stat) +/- 0.7(syst) MeV. The observation of two peaks, rather than one, is established with a significance exceeding five standard deviations. The mass of the B-c(+)(2S) meson is measured to be 6871.0 +/- 1.2(stat) +/- 0.8(syst) +/- 0.8(B-c(+)) MeV, where the last term corresponds to the uncertainty in the world-average B-c(+) mass
Measurement of the production cross section for a W boson in association with a charm quark in proton–proton collisions at √s=13 TeV
No full textThe strange quark content of the proton is probed through the measurement of the production cross section for a W boson and a charm (c) quark in proton–proton collisions at a center-of-mass energy of 13 TeV. The analysis uses a data sample corresponding to a total integrated luminosity of 138 fb^−1 collected with the CMS detector at the LHC. The W bosons are identified through their leptonic decays to an electron or a muon, and a neutrino. Charm jets are tagged using the presence of a muon or a secondary vertex inside the jet. The W + c production cross section and the cross section ratio R^±_c = σ(W^+ + \bar{c})/σ (W^− + c) are measured inclusively and differentially as functions of the transverse momentum and the pseudorapidity of the lepton originating from the W boson decay. The precision of the measurements is improved with respect to previous studies, reaching 1% in R^± _c= 0.950±0.005 (stat)±0.010 (syst). The measurements are compared with theoretical predictions up to next-to-next-to-leading order in perturbative quantum chromodynamics
4 August 2011 - Austrian Head of Protocol, Directorate General III, Federal Ministry of Science and Research I. Friedrich (3rd from left) in the LHC superconducting magnet test hall with M. Benedkit, C. Wulz and C. Fabjan.
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