cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Nephalai: Towards LPWAN C-RAN with Physical Layer Compression
Creators: name: Liu, Jun
name: Xu, Weitao
name: Jha, Sanjay
name: Hu, Wen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: We propose Nephalai, a Compressive Sensing-based Cloud Radio Access Network (C-RAN), to reduce the uplink bit rate of the physical layer (PHY) between the gateways and the cloud server for multi-channel LPWANs. Recent research shows that single-channel LPWANs suffer from scalability issues. While multiple channels improve these issues, data transmission is expensive. Furthermore, recent research has shown that jointly decoding raw physical layers that are offloaded by LPWAN gateways in the cloud can improve the signal-to-noise ratio (SNR) of week radio signals. However, when it comes to multiple channels, this approach requires high bandwidth of network infrastructure to transport a large amount of PHY samples from gateways to the cloud server, which results in network congestion and high cost due to Internet data usage. In order to reduce the operation's bandwidth, we propose a novel LPWAN packet acquisition mechanism based on Compressive Sensing with a custom design dictionary that exploits the structure of LPWAN packets, reduces the bit rate of samples on each gateway, and demodulates PHY in the cloud with (joint) sparse approximation. Moreover, we propose an adaptive compression method that takes the Spreading Factor (SF) and SNR into account. Our empirical evaluation shows that up to 93.7% PHY samples can be reduced by Nephalai when SF = 9 and SNR is high without degradation in the packet reception rate (PRR). With four gateways, 1.7x PRR can be achieved with 87.5% PHY samples compressed, which can extend the battery lifetime of embedded IoT devices to 1.7.
description: 14 pages, 14 figures, Mobicom 2020
Cluster-based dual evolution for multivariate time series: analyzing COVID-19
Creators: name: James, Nick
name: Menzies, Max
Publisher: name: arXiv
Year: 2020
Subjects: subject: Methodology (stat.ME)
subject: Dynamical Systems (math.DS)
subject: Physics and Society (physics.soc-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: This paper proposes a cluster-based method to analyze the evolution of multivariate time series and applies this to the COVID-19 pandemic. On each day, we partition countries into clusters according to both their case and death counts. The total number of clusters and individual countries' cluster memberships are algorithmically determined. We study the change in both quantities over time, demonstrating a close similarity in the evolution of cases and deaths. The changing number of clusters of the case counts precedes that of the death counts by 32 days. On the other hand, there is an optimal offset of 16 days with respect to the greatest consistency between cluster groupings, determined by a new method of comparing affinity matrices. With this offset in mind, we identify anomalous countries in the progression from COVID-19 cases to deaths. This analysis can aid in highlighting the most and least significant public policies in minimizing a country's COVID-19 mortality rate.
description: Accepted manuscript. Major expression edits and minor new inferences relative to v2. Equal contribution
Split form ALE discontinuous Galerkin methods with applications to under-resolved turbulent low-Mach number flows
Creators: name: Krais, Nico
name: Schnücke, Gero
name: Bolemann, Thomas
name: Gassner, Gregor
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: The construction of discontinuous Galerkin (DG) methods for the compressible Euler or Navier-Stokes equations (NSE) includes the approximation of non-linear flux terms in the volume integrals. The terms can lead to aliasing and stability issues in turbulence simulations with moderate Mach numbers (Ma < 0.3), e.g. due to under-resolution of vortical dominated structures typical in large eddy simulations (LES). The kinetic energy or entropy are elevated in smooth, but under-resolved parts of the solution which are affected by aliasing. It is known that the kinetic energy is not a conserved quantity for compressible flows, but for small Mach numbers minor deviations from a conserved evolution can be expected. While it is formally possible to construct kinetic energy preserving (KEP) and entropy conserving (EC) DG methods for the Euler equations, due to the viscous terms in case of the NSE, we aim to construct kinetic energy dissipative (KED) or entropy stable (ES) DG methods on moving curved hexahedral meshes. The Arbitrary Lagrangian-Eulerian (ALE) approach is used to include the effect of mesh motion in the split form DG methods. First, we use the three dimensional Taylor-Green vortex to investigate and analyze our theoretical findings and the behavior of the novel split form ALE DG schemes for a turbulent vortical dominated flow. Second, we apply the framework to a complex aerodynamics application. An implicit LES split form ALE DG approach is used to simulate the transitional flow around a plunging SD7003 airfoil at Reynolds number Re = 40, 000 and Mach number Ma = 0.1. We compare the standard nodal ALE DG scheme, the ALE DG variant with consistent overintegration of the non-linear terms and the novel KED and ES split form ALE DG methods in terms of robustness, accuracy and computational efficiency.
description: Submitted to Journal of Computational Physics
ANALYSE DER NACHFRAGEREAKTIONEN AUF DEN DIOXINSKANDAL: SIND DIE MEDIEN ODER LETZTENDLICH KONSUMGEWOHNHEITEN ENTSCHEIDEND?
Creators: name: Rieger, Jörg
name: Weible, Daniela
name: Rieger, Jörg
name: Weible, Daniela
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agricultural and Food Policy
subject: Demand and Price Analysis
subject: Food Consumption/Nutrition/Food Safety
subject: Lebensmittelskandal
subject: Nachfrageanalysen
subject: Paneldaten
subject: Medien
subject: Vertrauen
subject: Verbrauchergruppen
subject: Konsumgewohnheiten
subject: Risikowahrnehmung
subject: Cluster-und Faktoranalyse

description: Im Dezember 2010 wurden in Deutschland erhöhte Dioxingehalte u. a. im Futter für Geflügel festgestellt. Der Dioxinskandal hatte eine intensive Medienberichterstattung und einen Rückgang der Fleischnachfrage zur Folge. Da die genauen Gründe für die Verbraucherreaktionen während Lebensmittelskandalen noch unzureichend erforscht sind, untersucht diese Studie die Nachfrageveränderungen für verschiedene Verbrauchertypen während des Dioxinskandals 2010/11 für Geflügelfleisch in Deutschland. Ziel ist es, vor allem den Einfluss von Medienberichterstattung, Konsumgewohnheiten und verhaltenswissenschaftlichen Faktoren auf die Kaufentscheidungen der Haushalte zu betrachten. Auf Basis des GfK-Haushaltspanels werden potenzielle Nachfrageveränderungen bei Geflügelfleisch während des Dioxinskandals im Jahr 2011 in Deutschland analysiert. Zur Quantifizierung des Medieneinflusses wird ein Index gebildet, der die bedeutendsten Nachrichtenmedien in Deutschland einbezieht und die kumulative sowie abnehmende Informationswirkung modelliert. Um Unterschiede in der Risikowahrnehmung und dem Vertrauen der Verbraucher adäquat zu berücksichtigen, werden verschiedene Verbrauchergruppen mithilfe von Faktor-und Clusteranalysen, über Befragungsdaten des GfK-Haushaltspanels identifiziert. Zudem werden die gruppenspezifischen Nachfrageanalysen mit einem „Correlated Random Effect“ Tobit Modell durchgeführt, welches die Komplexität der Panelstruktur einschließlich der unbeobachteten Heterogenität entsprechend berücksichtigt. Unsere Ergebnisse zeigen, dass sich die Verbrauchergruppen in Bezug auf Risikowahrnehmung, Vertrauen und Mediennutzung unterscheiden. Die Medienberichterstattung hat für alle Verbrauchergruppen einen signifikanten negativen Effekt, wobei dieser zwischen den Gruppen variiert. Langfristige Konsumgewohnheiten der Verbrauchergruppen haben einen starken positiven Effekt auf die Geflügelfleischnachfrage. Dieses Ergebnis impliziert, dass das starke Gewohnheitsverhalten den negativen Einfluss der Medien während des Dioxinskandals reduziert hat.
Analysis of the $X_0(2900)$ as the scalar tetraquark state via the QCD sum rules
Creators: name: Wang, Zhi-Gang
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this article, we study the axialvector-diquark-axialvector-antidiquark ($AA$) type and scalar-diquark-scalar-antidiquark ($SS$) type fully open flavor $cs\bar{u}\bar{d}$ tetraquark states with the spin-parity $J^P={0}^+$ via the QCD sum rules. The predicted masses $M_{AA}=2.91\pm0.12\,\rm{GeV}$ and $M_{SS}=3.05\pm0.10\,\rm{GeV}$ support assigning the $X_0(2900)$ to be the $AA$-type scalar $cs\bar{u}\bar{d}$ tetraquark state.
description: 7 pages, 2 figures
LEBENSQUALITÄT IN DEUTSCHLAND – EIN VERGLEICH VON LÄNDLICHEN UND STÄDTISCHEN REGIONEN
Creators: name: Jantsch, Antje
name: Wunder, Christoph
name: Hirschauer, Norbert
name: Jantsch, Antje
name: Wunder, Christoph
name: Hirschauer, Norbert
Publisher: name: Unknown
Year: 2016
Subjects: subject: Community/Rural/Urban Development
subject: Lebenszufriedenheit
subject: Lebensqualität
subject: regionale Lebensbedingungen
subject: ländliche Bevölkerung

description: Die Verbesserung der Lebensqualität in ländlichen Regionen steht im Fokus der 2. Säule der Gemeinsamen Agrarpolitik. Vor diesem Hintergrund untersucht dieser Beitrag, ob sich die Lebensqualität zwischen ländlicher und städtischer Bevölkerung unterscheidet, welche Merk-male der Regionen für die Lebensqualität von Bedeutung sind und ob Präferenzunterschiede zwischen städtischer und ländlicher Bevölkerung bzgl. dieser Merkmale existieren. Die Le-bensqualität wird hierbei über die individuelle Selbsteinschätzung zur Lebenszufriedenheit approximiert. Daten des Sozio-oekonomischen Panels (SOEP) werden mit regionalen Indika-toren der amtlichen Statistik verknüpft. Die Ergebnisse zeigen, dass die Lebenszufriedenheit der ostdeutschen Bevölkerung im ländlichen Raum klar unter der der städtischen Bevölkerung liegt. Weiterhin sind bessere ökonomische Rahmenbedingungen, wie eine geringe Arbeitslo-senquote oder weniger Einkommensungleichheit, mit einer höheren Zufriedenheit in ländli-chen Gebieten verbunden. Unsere Analyse zeigt aber auch, dass ein höheres BIP nicht auto-matisch mit höherer Zufriedenheit korreliert.
Additional file 1 of Determination of the dipping direction of a blind reverse fault from InSAR: case study on the 2017 Sefid Sang earthquake, northeastern Iran
Creators: name: Ghayournajarkar, Nematollah
name: Fukushima, Yo
Publisher: name: figshare
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences
subject: Geophysics

description: Additional file 1. InSAR noise analysis.
Digital twin, physics-based model, and machine learning applied to damage detection in structures
Creators: name: Ritto, TG
name: Rochinha, FA
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This work is interested in digital twins, and the development of a simplified framework for them, in the context of dynamical systems. Digital twin is an ingenious concept that helps on organizing different areas of expertise aiming at supporting engineering decisions related to a specific asset; it articulates computational models, sensors, learning, real time analysis, diagnosis, prognosis, and so on. In this framework, and to leverage its capacity, we explore the integration of physics-based models with machine learning. A digital twin is constructed for a damaged structure, where a discrete physics-based computational model is employed to investigate several damage scenarios. A machine learning classifier, that serves as the digital twin, is trained with data taken from a stochastic computational model. This strategy allows the use of an interpretable model (physics-based) to build a fast digital twin (machine learning) that will be connected to the physical twin to support real time engineering decisions. Different classifiers (quadratic discriminant, support vector machines, etc) are tested, and different model parameters (number of sensors, level of noise, damage intensity, uncertainty, operational parameters, etc) are considered to construct datasets for the training. The accuracy of the digital twin depends on the scenario analyzed. Through the chosen application, we are able to emphasize each step of a digital twin construction, including the possibility of integrating physics-based models with machine learning. The different scenarios explored yield conclusions that might be helpful for a large range of applications.
description: Preprint
PRODUKTIONSSTRATEGISCHE ERFOLGSFAKTOREN VEREDELNDER WEINBAUBETRIEBE
Creators: name: Iselborn, Maximilian
name: Müller Loose, Simone
name: Kühl, Rainer
name: Iselborn, Maximilian
name: Müller Loose, Simone
name: Kühl, Rainer
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agribusiness
subject: Farm Management
subject: Production Economics
subject: Strategische Erfolgsfaktoren
subject: Unternehmensführung
subject: Weinbaubetriebe

description: Die Untersuchung wirtschaftlicher Erfolgsfaktoren stellt einen wichtigen Zweig in der Agrar- und Ernährungswirtschaft dar. Bisherige Untersuchungen zum wirtschaftlichen Erfolg und dessen Faktoren beschränken sich weitgehend auf die Untersuchung von acker-, futter-, und weinbautreibenden Rohwarenproduzenten (Dautzenberg and Petersen, 2005, Schultze, 2008, Schaper et al., 2011, Petersen, 2003, Mend, 2010). Während bei Rohwarenproduzenten die strategische Ausrichtung der Kostenführerschaft das größte Erfolgspotential einnimmt, da sich Produzenten tendenziell homogener Güter als Preisnehmer sehen (Stabler and Olfert, 2000), bieten sich für veredelnde Betriebe, wie z. B. Molkereien (Winkelmann, 2004) oder flaschenweinerzeugenden Weinbaubetrieben (Iselborn and Loose, 2016), auch differenzie-rungsorientierte Produktionsstrategien an. Aufgrund des hohen Grades an horizontaler und vertikaler Produktdifferenzierung (Mueller Loose and Szolnoki, 2012) sowie der breiten Streuung wirtschaftlicher Leistungen innerhalb der Weinbranche (Iselborn and Loose, 2016), eignet sich der Betriebstyp veredelnder Weinbaubetriebe, um neue Erkenntnisse zu produktionsstrategischen Erfolgsfaktoren in der Agrar- und Ernährungswirtschaft zu gewinnen. Im vorliegenden Beitrag wurden die kosten- und differenzierungsorientierten Produktionsstrategien veredelnder Weinbaubetriebe untersucht werden, um deren Unterschiede zu Rohwa-renproduzenten abzugrenzen. Insbesondere wurden konkrete Erfolgsfaktoren analysiert werden, die den kosten- und differenzierungsorientierten Produktionsstrategien zugrunde liegen. Auf-bauend auf einem Literaturüberblick und der Darstellung der für den Weinbau spezifischen Produktionsstrategien wurde ein hypothesenbasiertes theoretisches Erfolgsmodell abgeleitet und kausalanalytisch geprüft. Im Vergleich zu bisherigen Erfolgsfaktorenstudien, die sich vornehmlich auf die Untersuchung rohwarenproduzierender Unternehmen beschränkt, bietet die Untersuchung veredelnder Produzenten weitere Erkenntnisse zu produktionsstrategischen Erfolgsfaktoren. Im Strukturmodell wurden der Einfluss des Ertrags- und Aufwandsmanagement direkt sowie die Pro-duktionsstrategien der Naturalertrags- und Differenzierungsorientierung implizit auf den wirtschaftlichen Erfolg abgebildet. Des Weiteren konnten Faktoren identifiziert werden, die maßgeblich eine der beiden Produktionsstrategien verursachen.
A Genetic Algorithm-Based Exploration of Three Filament Models: A Case for the Magnetic Support of the G11.11-0.12 Infrared-Dark Cloud
Creators: name: Fiege, Jason D.
name: Johnstone, Doug
name: Redman, Russell O.
name: Feldman, Paul A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The G11.11-0.12 infrared-dark cloud has a filamentary appearance, both in extinction against the diffuse infrared emission of the Galactic plane and in emission at 850 microns. We use a novel computational technique based on an advanced genetic algorithm to explore thoroughly 3 different models of self-gravitating, pressure truncated filaments and to constrain their parameters. Specifically, the models tested are the non-magnetic Ostriker (1964) model, a generalized version of the magnetic Stodolkiewicz (1963) model, and the magnetic Fiege & Pudritz (2000) model. Previous results showed that G11.11-0.12 has a much steeper r^{-4} radial density profile than other filaments, where the density varies approximately as r^{-2}, and that this steep density profile is consistent with the Ostriker (1964) model. We present a more complete analysis that shows that the radial structure of G11.11-0.12 is consistent with regimes of each of these models. All of the magnetic models that agree with the data are threaded by a dominant poloidal magnetic field, and most have dynamically significant fields. Thus, G11.11-0.12 is an excellent candidate for radial support by a magnetic field that is predominantly poloidal. We predict the polarization patterns expected for both magnetic models and show that the two magnetic models produce different polarization patterns that should be distingished by observations.
description: To appear in Ap.J. Dec. 1 edition, volume 616. 40 pages and 42 figures. Figures are severely reduced to satisfy astro-ph size limits. A version with higher quality figures is available by contacting the first author
The penetration of plasma clouds across magnetic boundaries : the role of high frequency oscillations
Creators: name: Hurtig, Tomas
name: Brenning, Nils
name: Raadu, Michael A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Experiments are reported where a collisionfree plasma cloud penetrates a magnetic barrier by self-polarization. We here focus on the resulting anomalous magnetic field diffusion into the plasma cloud, two orders of magnitude faster than classical, which is one important aspect of the plasma cloud penetration mechanism. Without such fast magnetic diffusion, clouds with kinetic beta below unity would not be able to penetrate magnetic barriers at all. Tailor-made diagnostics has been used for measurements in the parameter range with the kinetic beta ? 0.5 to 10, and with normalized width w/r(gi) of the order of unity. Experimental data on hf fluctuations in density and in electric field has been combined to yield the effective anomalous transverse resistivity eta(EFF). It is concluded that they are both dominated by highly nonlinear oscillations in the lower hybrid range, driven by a strong diamagnetic current loop that is set up in the plasma in the penetration process. The anomalous magnetic diffusion rate, calculated from the resistivity eta(EFF), is consistent with single-shot multi-probe array measurements of the diamagnetic cavity and the associated quasi-dc electric structure. An interpretation of the instability measurements in terms of the resistive term in the generalized (low frequency) Ohm's law is given.
description: 12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)
DIENEN TERMINMARKTNOTIERUNGEN FÜR SCHLACHTSCHWEINE ZUR PROGNOSE ZUKÜNFTIGER PREISENTWICKLUNGEN?
Creators: name: Vollmer, Teresa
name: Holst, Carsten
name: Vollmer, Teresa
name: Holst, Carsten
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agricultural Finance
subject: Demand and Price Analysis
subject: Research Methods/ Statistical Methods
subject: Schlachtschweine
subject: Futures
subject: Prognosegüte
subject: Preistransmission

description: Im Bereich lagerfähiger Agrargüter wird Futures-Preisen eine hohe Bedeutung als Indikator zukünftiger Preisentwicklungen beigemessen. Handelt es sich jedoch um nicht-lagerfähige Güter wie Schlachtschweine, herrscht hinsichtlich der Prognoseeffizienz von Futures-Notierungen Uneinigkeit. In diesem Beitrag wird die Überlegenheit der Preisprognosen für den Kassamarkt für Schlachtschweine mittels Futures-Notierungen gegenüber der naiven Preiserwartung überprüft und zudem die Gleichgewichtsbeziehungen zwischen Futures- und Kassamarktpreisen analysiert. Dazu werden auf Notierungen des FHOG-Futures der Eurex Exchange und auf den Vereinigungspreis für Schlachtschweine der Vereinigung der Erzeu- gergemeinschaften für Vieh und Fleisch e.V. (VEZG) zurückgegriffen und neben der Berechnung von Prognosegütekennzahlen Preistransmissionsanalysen durchgeführt. Unsere Ergebnisse zeigen zum einen, dass Preisprognosen mittels Futures-Kursen treffendere Ergebnisse liefern als die Annahme konstanter Preise. Allerdings nimmt die Prognosegüte mit steigendem Prognosehorizont ab. Zum anderen wird festgestellt, dass sich die Futures-Preise unter-schiedlicher zukünftiger Fälligkeiten und der Vereinigungspreis für Schlachtschweine der VEZG in langfristigen Gleichgewichtsbeziehungen zueinander befinden und sich gegenseitig beeinflussen.
Algebraic stability analysis of constraint propagation
Creators: name: Frauendiener, Jörg
name: Vogel, Tilman
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The divergence of the constraint quantities is a major problem in computational gravity today. Apparently, there are two sources for constraint violations. The use of boundary conditions which are not compatible with the constraint equations inadvertently leads to 'constraint violating modes' propagating into the computational domain from the boundary. The other source for constraint violation is intrinsic. It is already present in the initial value problem, i.e. even when no boundary conditions have to be specified. Its origin is due to the instability of the constraint surface in the phase space of initial conditions for the time evolution equations. In this paper, we present a technique to study in detail how this instability depends on gauge parameters. We demonstrate this for the influence of the choice of the time foliation in context of the Weyl system. This system is the essential hyperbolic part in various formulations of the Einstein equations.
description: 25 pages, 5 figures; v2: small additions, new reference, publication number, classification and keywords added, address fixed; v3: update to match journal version
Diversifikation und Arbeitszufriedenheit – trifft die These von Marx und Engels auf Landwirte zu?
Creators: name: Mann, Stefan
name: Besser, Tim
name: Mann, Stefan
name: Besser, Tim
Publisher: name: Unknown
Year: 2016
Subjects: subject: Consumer/Household Economics
subject: Farm Management
subject: diversification
subject: work satisfaction
subject: agricultural systems

description: In den herkömmlichen Wirtschaftswissenschaften wurde viel Energie darauf verwendet, die Effizienzgewinne der Spezialisierung nachzuweisen, auch im Agrarsektor. Während die These von Marx und Engels, wonach die Diversifikation unseres Arbeitslebens unsere Arbeitszufriedenheit erhöhen würde, in den Sozialwissenschaft durchaus Aufmerksamkeit erzeugt wurde, wurde diese These für den Agrarsektor nie verifiziert, ungeachtet einer anwachsenden Literatur zu den Determinanten der Arbeitszufriedenheit. Dieser Beitrag nützt eine Umfrage unter schweizerischen und nordostdeutschen Landwirten, um zu zeigen, dass betriebliche Diversifikation die Arbeitszufriedenheit signifikant erhöht. Dies trifft auf die Anzahl der Produktlinien auf einem Landwirtschaftsbetrieb zu, aber auch auf nichtlandwirtschaftliche Aktivitäten auf dem Betrieb.
ENTWICKLUNG UND ÜBERPRÜFUNG EINES EINKAUFSCONVENIENCE-MODELLS FÜR DEN EINKAUF VON KONSUMENTEN IM LEBENSMITTELEINZELHANDEL
Creators: name: Geise, Wolfgang
name: Geise, Fabian A.
name: Pömpner, Alexandra
name: Geise, Wolfgang
name: Geise, Fabian A.
name: Pömpner, Alexandra
Publisher: name: Unknown
Year: 2016
Subjects: subject: Consumer/Household Economics
subject: Marketing
subject: FOS: Economics and business
subject: Einkaufsconvenience
subject: Konstrukt
subject: Messinstrument
subject: Konsumentenverhalten
subject: Lebensmitteleinzelhandel

description: In diesem Beitrag wird ein konsumentenorientiertes Einkaufsconvenience-Modell in Bezug auf den Lebensmitteleinzelhandel entwickelt und empirisch überprüft. Zentrale Größe des Modells ist das theoretische Konstrukt „Einkaufsconvenience“. Es wird die Konzeptualisierung und Operationalisierung dieser Größe aufgezeigt. Das Konstrukt stellt eine mehrdimensionale Größe dar, die anhand der vier Dimensionen Zugangs-, Such-, Abwicklungs- und Nachkauf-Convenience inhaltlich konkretisiert wird. Gemessen wird es mit Hilfe eines Multi-Item-Messinstruments. Gegenstand des Modells sind neben der Konstruktmessung die Wirkungen der wahrgenommenen Einkaufsconvenience auf die verhaltenswissenschaftlichen Wirkungsgrößen Kundenzufriedenheit, Preisbereitschaft, Wiederbesuchs- und Weiterempfehlungsabsicht. Im Rahmen einer empirischen Studie (n = 479 Konsumenten) wurden die wahrgenommene Einkaufsconvenience und die Wirkungsgrößen am Beispiel der beiden Lebensmittel-Einzelhandelsunternehmen Aldi und Real gemessen. Im Ergebnis zeigt sich, dass mit dem entwickelten Messinstrument ein reliabler und valider Messansatz vorliegt, der betriebsformenübergreifend eingesetzt werden kann. Die dem Modell zugrunde liegenden Wirkungshypothesen konnten empirisch bestätigt werden. Das Modell bietet dem Management im Lebensmitteleinzelhandel vielfältige diagnostische Informationen (Consumer Insights), die insbesondere für den Einsatz von Maßnahmen zur Verbesserung der Einkaufsconvenience genutzt werden können.
Ergodicity for the weakly damped stochastic non-linear Schrödinger equations
Creators: name: Debussche, Arnaud
name: Odasso, Cyril
Publisher: name: arXiv
Year: 2004
Subjects: subject: Analysis of PDEs (math.AP)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 35Q55

description: We study a damped stochastic non-linear Schrödinger (NLS) equation driven by an additive noise. It is white in time and smooth in space. Using a coupling method, we establish convergence of the Markovian transition semi-group toward a unique invariant probability measure. This kind of method was originally developped to prove exponential mixing for strongly dissipative equations such as the Navier-Stokes equations. We consider here a weakly dissipative equation, the damped nonlinear Schrödinger equation in the one dimensional cubic case. We prove that the mixing property holds and that the rate of convergence to equilibrium is at least polynomial of any power.
Ultraclean two-dimensional hole systems with mobilities exceeding 10$^7$ cm$^2$/Vs
Creators: name: Gupta, Adbhut
name: Wang, C.
name: Singh, S. K.
name: Baldwin, K. W.
name: Winkler, R.
name: Shayegan, M.
name: Pfeiffer, L. N.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Owing to their large effective mass, strong and tunable spin-orbit coupling, and complex band-structure, two-dimensional hole systems (2DHSs) in GaAs quantum wells provide rich platforms to probe exotic many-body physics, while also offering potential applications in ballistic and spintronics devices, and fault-tolerant topological quantum computing. We present here a systematic study of molecular-beam-epitaxy grown, modulation-doped, GaAs (001) 2DHSs where we explore the limits of low-temperature 2DHS mobility by optimizing two parameters, the GaAs quantum well width and the alloy fraction ($x$) of the flanking Al$_x$Ga$_{1-x}$As barriers. We obtain a breakthrough in 2DHS mobility, with a peak value $\simeq 18 \times 10^6$ cm$^2$/Vs at a density of 3.8 $\times$ 10$^{10}$ /cm$^{2}$, implying a mean-free-path of $\simeq 57 μ$m. Using transport calculations tailored to our structures, we analyze the operating scattering mechanisms to explain the non-monotonic evolution of mobility with density. We find it imperative to include the dependence of effective mass on 2DHS density, well width, and $x$. We observe concomitant improvement in quality as evinced by the appearance of delicate fractional quantum Hall states at very low density.
description: 10 pages, 4 figures, Accepted in Physical Review Materials
Conditions for plasmoid penetration across magnetic barriers
Creators: name: Brenning, Nils
name: Hurtig, Tomas
name: Raadu, Michael A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The penetration of plasma clouds, or plasmoids, across abrupt magnetic barriers (of the scale less than a few ion gyro radii, using the plasmoid directed velocity) is studied. The insight gained earlier, from experimental and computer simulation investigations of a case study, is generalised into other parameter regimes. It is concluded for what parameters a plasmoid should be expected to penetrate the magnetic barrier through self-polarization, penetrate through magnetic expulsion, or be rejected from the barrier. The scaling parameters are n(e), v(0), B(perp), m(i), T(i), and the width w of the plasmoid. The scaling is based on a model for strongly driven, nonlinear magnetic field diffusion into a plasma, which is a generalization of the laboratory findings. The results are applied to experiments earlier reported in the literature, and also to the proposed application of impulsive penetration of plasmoids from the solar wind into the Earth's magnetosphere.
description: 12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)
Importance of radiative effects in gap opening by planets in protoplanetary disks
Creators: name: Ziampras, Alexandros
name: Kley, Wilhelm
name: Dullemond, Cornelis P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Recent ALMA observations revealed concentric annular structures in several young class-II objects. In an attempt to produce the rings and gaps in some of these systems, they have been modeled numerically with a single embedded planet assuming a locally isothermal equation of state. This is often justified by observations targeting the irradiation-dominated outer regions of disks (approximately 100 au). We test this assumption by conducting hydrodynamics simulations of embedded planets in thin locally isothermal and radiative disks that mimic the systems HD 163296 and AS 209 in order to examine the effect of including the energy equation in a seemingly locally isothermal environment as far as planet-disk interaction is concerned. We find that modeling such disks with an ideal equation of state makes a difference in terms of the number of produced rings and the spiral arm contrast in the disk. Locally isothermal disks produce sharper annular or azimuthal features and overestimate a single planet's gap-opening capabilities by producing multiple gaps. In contrast, planets in radiative disks carve a single gap for typical disk parameters. Consequently, for accurate modeling of planets with semimajor axes up to about 100 au, radiative effects should be taken into account even in seemingly locally isothermal disks. In addition, for the case of AS 209, we find that the primary gap is significantly different between locally isothermal and radiative models. Our results suggest that multiple planets are required to explain the ring-rich structures in such systems.
description: 10 pages, 12 figures, 2 tables; accepted for publication in Astronomy and Astrophysics (A&A)
Charged massive vector boson propagator in a constant magnetic field in arbitrary $ξ$-gauge obtained using the modified Fock-Schwinger method
Creators: name: Iablokov, S. N.
name: Kuznetsov, A. V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We applied a recently published modified Fock-Schwinger (MFS) method to find the exact solution of the propagator equation for a charged vector boson in the presence of a constant magnetic field directly in the momentum space as a sum over Landau levels in arbitrary $ξ$-gauge. In contrast to the standard approaches for finding propagators, MFS method demonstrated several improvements in terms of computational complexity reduction and revealed simple internal structures in intermediate and final expressions, thus allowing to obtain new useful representations of the propagator.
description: 10 pages, 0 figures; v2: presentation improved, to appear in PRD
Detection and analysis of nucleic acids using nanometer-scale pores
Creators: name: Nakane, Jonathan Jamie
Publisher: name: University of British Columbia
Year: 2010

description: Advances in genomics and in its application to personalized medicine have increased the demand for faster and cheaper methods of nucleic acid analysis techniques. Nanopore-based single-molecule detection schemes are exceptionally good candidates for novel technologies to address this demand. This thesis presents the initial attempts and characterization of two implementations of the alpha-hemolysin (aHL) protein nanopore as a nanosensor for the detection and analysis of single nucleic acid molecules. The two detection schemes address shortcomings in present analysis techniques, and are distinguished by the mode of molecule capture and identification and by the proposed application. In the first method, single-stranded DNA fragments are captured from the bulk solution on the cis -side of the pore membrane, with the resulting rate of capture used as an electronic means of measuring local nucleic acid concentrations, obviating the need for optics or fluorescent molecular tags used during conventional DNA detection. Experimental results of single-stranded DNA fragment capture at high transmembrane potentials and an improved model of molecule capture from the bulk solution show that nanopore capture rates may be a viable method of estimating nucleic acid concentrations. In the second method, the aHL pore is used in conjunction with a synthetic probe molecule to capture individual single stranded DNA molecules on the trans -side of the membrane to perform single-molecule hybridization and force-dissociation experiments. Experimental results demonstrate that ensemble measurements can be used to measure the kinetics of hybridization and dissociation of single molecules of nucleic acids hybridizing to the probe molecule, with single-molecule sensitivity and single-nucleotide specificity. The detection of molecules across a membrane using force-dissociation techniques shows potential in use for the next generation of instrumentation for genomics and potentially for in vivo, real-time detection of biomolecules.
Probabilistic models motivated by cooperative sequential adsorption
Creators: name: Shcherbakov, Vadim
Publisher: name: arXiv
Year: 2023
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: This survey concerns probabilistic models motivated by cooperative sequential adsorption (CSA) models. CSA models are widely used in physics and chemistry for modelling adsorption processes in which adsorption rates depend on the spatial configuration of already adsorbed particles. Corresponding probabilistic models describe random sequential allocation of particles either in a subset of Euclidean space, or at vertices of a graph. Depending on a technical setup these probabilistic models are stated in terms of spatial or integer-valued interacting birth-and-death processes. In this survey we consider several such models that have been studied in recent years.
Comment on "Influence of Pair Breaking and Phase Fluctuations on Disordered High Tc Cuprate Superconductors"
Creators: name: Openov, L. A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: It is shown that an account for combined effect of both nonmagnetic and magnetic scatterers on Tc and/or an assumption about a non-pure d-wave order parameter allows for a quantitative explanation of the experimental data on the electron irradiation-induced suppression of superconductivity in Y-123 single crystals within the AG-like pair breaking theory, without resorting to phase fluctuations effects.
description: Comment on the paper by F. Rullier-Albenque et al., Phys. Rev. Lett. 91, 047001 (2003)
Tightening the tripartite quantum memory assisted entropic uncertainty relation
Creators: name: Dolatkhah, H.
name: Haseli, S.
name: Salimi, S.
name: Khorashad, A. S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The uncertainty principle determines the distinction between the classical and quantum worlds. This principle states that it is not possible to measure two incompatible observables with the desired accuracy simultaneously. In quantum information theory, Shannon entropy has been used as an appropriate measure to express the uncertainty relation. According to the applications of entropic uncertainty relation, studying and trying to improve the bound of this relation is of great importance. Uncertainty bound can be altered by considering an extra quantum system as the quantum memory $B$ which is correlated with the measured quantum system $A$. One can extend the bipartite quantum memory assisted entropic uncertainty relation to tripartite quantum memory assisted entropic uncertainty relation in which the memory is split into two parts. In this work, we obtain a lower bound for the tripartite quantum memory assisted entropic uncertainty relation. Our lower bound has two additional terms compared to the lower bound in [Phys. Rev. Lett. 103, 020402 (2009)] which depending on the conditional von Neumann entropy, the Holevo quantity and mutual information. It is shown that the bound obtained in this work is more tighter than other bounds. In addition, using our lower bound, a lower bound for the quantum secret key rate has been obtained. The lower bound is also used to obtain the states for which the strong subadditivity inequality and Koashi-Winter inequality is satisfied with equality.
description: 6 pages, 4 figures, comments and suggestions are welcome!
Probing supermassive black hole growth and its dependence on stellar mass and star-formation rate in low-redshift galaxies
Creators: name: Torbaniuk, O.
name: Paolillo, M.
name: D'Abrusco, R.
name: Vignali, C.
name: Georgakakis, A.
name: Carrera, F. J.
name: Civano, F.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present an improved study of the relation between supermassive black hole growth and their host galaxy properties in the local Universe (z < 0.33). To this end, we build an extensive sample combining spectroscopic measurements of star-formation rate (SFR) and stellar mass from Sloan Digital Sky Survey, with specific Black Hole accretion rate (sBHAR, $λ_{\mathrm{sBHAR}} \propto L_{\mathrm{X}}/\mathcal{M}_{\ast}$) derived from the XMM-Newton Serendipitous Source Catalogue (3XMM-DR8) and the Chandra Source Catalogue (CSC 2.0). We find that the sBHAR probability distribution for both star-forming and quiescent galaxies has a power-law shape peaking at $\logλ_{\mathrm{sBHAR}}\sim -3.5$ and declining toward lower sBHAR in all stellar mass ranges. This finding confirms the decrease of AGN activity in the local Universe compared to higher redshifts. We observe a significant correlation between $\log\,λ_{\mathrm{sBHAR}}$ and $\log\,{\mathrm{SFR}}$ in almost all stellar mass ranges, but the relation is shallower compared to higher redshifts, indicating a reduced availability of accreting material in the local Universe. At the same time, the BHAR-to-SFR ratio for star-forming galaxies strongly correlates with stellar mass, supporting the scenario where both AGN activity and stellar formation primarily depend on the stellar mass via fuelling by a common gas reservoir. Conversely, this ratio remains constant for quiescent galaxies, possibly indicating the existence of the different physical mechanisms responsible for AGN fuelling or different accretion mode in quiescent galaxies.
description: 18 pages, 12 figures, accepted for publication in MNRAS
Massive Elementary Particles and Black Holes in Resummed Quantum Gravity
Creators: name: Ward, B. F. L.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We use exact results in a new approach to quantum gravity to show that the classical conclusion that a massive elementary point particle is a black hole is obviated by quantum loop effects. Further phenomenological implications are discussed.
description: 4 pages, 1 figure; presented at ICHEP04
Fano resonance in quadratic waveguide arrays
Creators: name: Miroshnichenko, A. E.
name: Kivshar, Y. S.
name: Vicencio, R. A.
name: Molina, M. I.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study resonant light scattering in arrays of channel optical waveguides where tunable quadratic nonlinearity is introduced as nonlinear defects by periodic poling of single (or several) waveguides in the array. We describe novel features of wave scattering that can be observed in this structure and show that it is a good candidate for the first observation of Fano resonance in nonlinear optics.
description: 3 pages, 3 figures, submitted to Optics Letters, slightly revised
A general way to confined stationary Vlasov-Poisson plasma configurations
Creators: name: Belyaeva, Yulia O.
name: Gebhard, Björn
name: Skubachevskii, Alexander L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We address the existence of stationary solutions of the Vlasov-Poisson system on a domain $Ω\subset\mathbb{R}^3$ describing a high-temperature plasma which due to the influence of an external magnetic field is spatially confined to a subregion of $Ω$. In a first part we provide such an existence result for a generalized system of Vlasov-Poisson type and investigate the relation between the strength of the external magnetic field, the sharpness of the confinement and the amount of plasma that is confined measured in terms of the total charges. The key tools here are the method of sub-/supersolutions and the use of first integrals in combination with cutoff functions. In a second part we apply these general results to the usual Vlasov-Poisson equation in three different settings: the infinite and finite cylinder, as well as domains with toroidal symmetry. This way we prove the existence of stationary solutions corresponding to a two-component plasma confined in a Mirror trap, as well as a Tokamak.
description: 32 pages, 1 figure; in the updated version an appendix concerning a reference we cite has been added
WINZERGENOSSENSCHAFTEN IM KONTEXT DES WEINTOURISMUS
Creators: name: Rüdiger, Jens
name: Kerpen, Marie-Luise
name: Hanf, Jon H.
name: Rüdiger, Jens
name: Kerpen, Marie-Luise
name: Hanf, Jon H.
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agribusiness
subject: Marketing
subject: FOS: Economics and business
subject: Weintourismus
subject: Winzergenossenschaften
subject: Weinmarketing

description: Aufgrund des zunehmenden nationalen und internationalen Wettbewerbs, muss sich die deutsche Weinwirtschaft neue Diversifikationsmöglichkeiten erarbeiten. Eine dieser Möglichkeiten ist der Weintourismus. Hier haben auch deutsche Winzergenossenschaften die Möglichkeit, dieses Potential für sich zu nutzen. In dieser Untersuchung wird das in der Literatur noch neue Phänomen beleuchtet, inwieweit sich Winzergenossenschaften im Bereich des Weintourismus engagieren und welche Ziele sie damit verfolgen. Zudem wird eruiert, inwieweit sich die Mitglieder einer Winzergenossenschaft als Multiplikatoren bei der Durchführung von weintouristischen Aktivitäten einbringen. Des Weiteren wird die definitorische Begrifflichkeit des Weintourismus genauer analysiert. In der Arbeit zeigte sich, dass Winzergenossenschaften identisch wie Weingüter weintouristische Aktivitäten in ihre Unternehmensstruktur integriert haben. Dies erfolgt aber im Gegensatz zu den meisten Weingütern nicht mit dem Ziel, eine eigene Wertschöpfung zu generieren, sondern dient eher als reines Marketinginstrument. Hierbei wird unterschieden zwischen Genossenschaften mit vermehrtem indirektem Vertrieb, die diese Kommunikationsmaßnahme als Direktkommunikation für die Erschließung neuer Zielgruppen sehen, bzw. Genossenschaften mit vermehrtem direktem Vertrieb, welche die Verkaufsförderung verfolgen. Bei der Umsetzung der jeweiligen weintouristischen Aktivitäten zeigte sich, dass noch Potential für Innovationen besteht. Auch die Möglichkeiten der Einbindung der Mitglieder als Multiplikatoren bei der Durchführung, Kommunikation oder auch Anbindung an die Genossenschaft durch weintouristische Aktivitäten wird von vielen Geschäftsführern unterschätzt. Hinsichtlich der Definition lässt sich festhalten, dass Weintourismus immer - je nach Blickwinkel - die Sichtweise des Anbieters oder Nachfragers annimmt. Die definitorischen Ansätze haben gemeinsam, dass unabhängig vom Nutzen, Konsum oder Direktvermarktung das weinbezogene Erlebnis und die Ortsveränderung zur ausführenden Destination im Vordergrund stehen müssen.
title: Concert garden - best view : Eventarchitektur im Burgenland ; Open Air Bühne für Eisenstadt
Creators: name: Malitsak, Patrick
Publisher: name: TU Wien
Year: 2017
Subjects: subject: Architekturtheorie
subject: Architekturgeschichte
subject: Schloss Esterhazi
subject: Event-Architektur
subject: Architecture theory
subject: Architecture History
subject: Esterhazi Palace
subject: Event architecture

description: Die vorliegende Diplomarbeit befasst sich mit dem Entwurf einer Freilichtbühne im Schlosspark von Eisenstadt. Eisenstadt ist die Landeshauptstadt des Burgenlands und ist in etwa 50 Minuten von Wien zu erreichen. Geprägt wurde Eisenstadt von Franz Joseph Haydns Musik, welche diesen Ort national, sowie international bekannt gemacht hat. Der Schlosspark, als englischer Landschaftsgarten für die ungarische Magnatenfamilie Esterházy angelegt, wurde weit über die Grenzen Österreichs und Ungarns hinaus berühmt. Der Entwurf dieser Diplomarbeit bezieht sich auf die Stelle eines ehemaligen Stadions. Mit dem Bau des Stadions inmitten des Parks zerstörte man einen wunderbaren Ort. Dieser Entwurf soll diese Zerstörung, sozusagen die Wunde im Park, schließen und gleichzeitig eine Freilichtbühne für Musikkonzerte schaffen. Historische Wegenetze, Einfügung in das Gelände sowie Diversität in der Sitzplatzgestaltung des Konzertbesuchs sind einige der Punkte im Entwurf.
description: This diploma thesis deals with the design of an open-air stage in the castle grounds of Eisenstadt. Eisenstadt is the provincial capital of Burgenland which is about fifty minutes away from Vienna. This village has been characterized by Franz Jospeh Hayds music, which has made Eisenstadt famous both national and international. The castle grounds, designed as an English landscape garden for the hungarian magnate family Esterházy, was praised far beyond the borders of Austria and Hungary. The design of this diploma thesis is located on the site of a former stadium. The construction of this stadium destroyed a wonderful place in the castle grounds. Not only a closure of a wound in the park but also creating an open-air stage for music concerts are the intentions of this design. The historical reasons, the inclusion into the terrain as well as diversity in the seating arrangement of the open-air stage are some of the points the design of this diploma thesis adresses.