cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Review of three-dimensional human-computer interaction with focus on the leap motion controller
Creators: name: Bachmann, Daniel
name: Weichert, Frank
name: Rinkenauer, Gerhard
Publisher: name: Technische Universität Dortmund
Year: 2018
Subjects: subject: Human-computer interaction
subject: Contact-free input devices
subject: Three-dimensional interaction
subject: Natural user interfaces
subject: Leap motion controller
subject: 004
subject: Mensch-Maschine-Kommunikation
subject: Graphische Benutzeroberfläche

description: Modern hardware and software development has led to an evolution of user interfaces from command-line to natural user interfaces for virtual immersive environments. Gestures imitating real-world interaction tasks increasingly replace classical two-dimensional interfaces based on Windows/Icons/Menus/Pointers (WIMP) or touch metaphors. Thus, the purpose of this paper is to survey the state-of-the-art Human-Computer Interaction (HCI) techniques with a focus on the special field of three-dimensional interaction. This includes an overview of currently available interaction devices, their applications of usage and underlying methods for gesture design and recognition. Focus is on interfaces based on the Leap Motion Controller (LMC) and corresponding methods of gesture design and recognition. Further, a review of evaluation methods for the proposed natural user interfaces is given.
description: Sensors;Jg.: 18, Heft: 7 | S. 2194-1-2194-39
The Low-Redshift Lyman Alpha Forest toward PKS 0405-123
Creators: name: Williger, G. M.
name: Heap, S. R.
name: Weymann, R. J.
name: Dave, R.
name: Ellingson, E.
name: Carswell, R. F.
name: Tripp, T. M.
name: Jenkins, E. B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present STIS 7km/s resolution data of the Ly-a forest toward PKS0405-123 (z=0.574). We make two samples. The strong sample (60 systems) has column density logNHI>13.3 over 0.00213.1 at 0.020=47+-22km/s; for the weak, =44+-21km/s. Line blending and s/n effects likely inflate b. The redshift density dN/dz is consistent with previous, lower resolution results for logNHI>14.0. For 13.113.3, consistent with a numerical model. There is a void in the strong sample at 0.0320 13.5-14.0. The strength is similar to that of the galaxy-galaxy correlation for our sample, implying that such Ly-a systems have mass log M/Msun= 11.3+1.0-0.6. Including lower column density systems in the sample shows correlations only out to Delta v <125km/s, as would be expected for smaller density perturbations. Galaxy counts and local HI column density appear correlated, peaking at ~5000km/s. We also give column densities for Galactic species. (Abridged)
description: 59 pages, 6 tables, 14 figures, 1 standalone, ApJ, in press; minor revisions/clarifications for acceptance, including galaxy list
Chromospheric magnetic field: A comparison of He I 10830 A observations with nonlinear force-free field extrapolation
Creators: name: Kawabata, Yusuke
name: Ramos, Andrés Asensio
name: Inoue, Satoshi
name: Shimizu, Toshifumi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The nonlinear force-free field (NLFFF) modeling has been extensively used to infer the three-dimensional (3D) magnetic field in the solar corona. One of the assumptions in the NLFFF extrapolation is that the plasma beta is low, but this condition is considered to be incorrect in the photosphere. We examine direct measurements of the chromospheric magnetic field in two active regions through spectropolarimetric observations at He I 10830 A, which are compared with the potential fields and NLFFFs extrapolated from the photosphere. The comparisons allow quantitative estimation of the uncertainty in the NLFFF extrapolation from the photosphere. Our analysis shows that observed chromospheric magnetic field may have larger non-potentiality compared to the photospheric magnetic field. Moreover, the large non-potentiality in the chromospheric height may not be reproduced by the NLFFF extrapolation from the photospheric magnetic field. The magnitude of the underestimation of the non-potentiality at chromospheric heights may reach 30-40 degree in shear signed angle in some locations. This deviation may be caused by the non-force-freeness in the photosphere. Our study suggests the importance of the inclusion of measured chromospheric magnetic fields in the NLFFF modeling for the improvement of the coronal extrapolation.
description: accepted in ApJ
Simulation of cyclic deformation behavior of selective laser melted and hybrid-manufactured aluminum alloys using the phase-field method
Creators: name: Siddique, Shafaqat
name: Awd, Mustafa
name: Klinge, Sandra
name: Walther, Frank
name: Wiegold, Tillmann
Publisher: name: Technische Universität Dortmund
Year: 2018
Subjects: subject: Selective laser melting
subject: Al-alloys
subject: Porosity
subject: Residual stresses
subject: Deformation behavior
subject: Phase-field method
subject: 660
subject: Selektives Laserschmelzen
subject: Aluminium
subject: Legierung
subject: Porosität
subject: Eigenspannung
subject: Deformationsverhalten
subject: Phasenfeldmodell

description: Selective laser melting process has already been developed for many metallic materials, including steel, aluminum, and titanium. The quasistatic properties of these materials have been found to be comparable or even better than their conventionally-manufactured counterparts; however, for their reliable applications in operational components, their fatigue behavior plays a critical role, which is dominated by several process-related features, like surface roughness, remnant porosity, microstructure, and residual stresses, which are controlled by the processing features, like imparted energy density to the material, its corresponding solidification behavior, the cooling rate in the process, as well as post-processing treatments. This study investigates the influence of these parameters on the cyclic deformation behavior of selective laser melted as well as hybrid-manufactured aluminum alloys. The corresponding microstructural features and porosity conditions are evaluated for developing correlations between the process conditions to microstructure, the deformation behavior, and the corresponding fatigue lives. From the numerical point of view, damage development with respect to process-induced cyclic deformation behavior is assessed by the phase-field method, which has been identified as an appropriate method for the determination of fatigue life at the respective applied stress levels. Fatigue strength of SLM-processed parts is found better than their cast counterparts, while hybridization has further increased fatigue strength. No effect of test frequency on the fatigue life could be established.
description: Applied Sciences;Jg.: 8, Heft: 10 | S. 1948-1-1948-18
Two-dimensional melting far from equilibrium in a granular monolayer
Creators: name: Olafsen, J. S.
name: Urbach, J. S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We report an experimental investigation of the transition from a hexagonally ordered solid phase to a disordered liquid in a monolayer of vibrated spheres. The transition occurs as the intensity of the vibration amplitude is increased. Measurements of the density of dislocations and the positional and orientational correlation functions show evidence for a dislocation-mediated continuous transition from a solid phase with long-range order to a liquid with only short-range order. The results show a strong similarity to simulations of melting of hard disks in equilibrium, despite the fact that the granular monolayer is far from equilibrium due to the effects of interparticle dissipation and the vibrational forcing.
description: 4 pages, 4 figures
Geospatial IoT—the need for event-driven architectures in contemporary spatial data infrastructures
Creators: name: Rieke, Matthes
name: Bigagli, Lorenzo
name: Herle, Stefan
name: Jirka, Simon
name: Kotsev, Alexander
name: Liebig, Thomas
name: Malewski, Christian
name: Paschke, Thomas
name: Stasch, Christoph
Publisher: name: Technische Universität Dortmund
Year: 2018
Subjects: subject: event-driven architectures
subject: asynchronous transactions
subject: sensor web
subject: spatiotemporal data
subject: real-time data
subject: stream processing
subject: spatial data infrastructures
subject: sensor networks
subject: 004
subject: Drahtloses Sensorsystem
subject: Echtzeitverarbeitung
subject: Datenstrom
subject: Geodateninfrastruktur

description: The nature of contemporary spatial data infrastructures lies in the provision of geospatial information in an on-demand fashion. Although recent applications identified the need to react to real-time information in a time-critical way, research efforts in the field of geospatial Internet of Things in particular have identified substantial gaps in this context, ranging from a lack of standardisation for event-based architectures to the meaningful handling of real-time information as “events”. This manuscript presents work in the field of event-driven architectures as part of spatial data infrastructures with a particular focus on sensor networks and the devices capturing in-situ measurements. The current landscape of spatial data infrastructures is outlined and used as the basis for identifying existing gaps that retain certain geospatial applications from using real-time information. We present a selection of approaches—developed in different research projects—to overcome these gaps. Being designed for specific application domains, these approaches share commonalities as well as orthogonal solutions and can build the foundation of an overall event-driven spatial data infrastructure.
description: ISPRS International Journal of Geo-Information;Jg.: 7, Heft: 10 | S. 385-1-385-29
The quantum solitons atomtronic interference device
Creators: name: Polo, Juan
name: Naldesi, Piero
name: Minguzzi, Anna
name: Amico, Luigi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study a quantum many-body system of attracting bosons confined in a ring-shaped potential and interrupted by a weak link. With such architecture, the system defines atomtronic quantum interference devices harnessing quantum solitonic currents. We demonstrate that the system is characterized by the specific interplay between the interaction and the strength of the weak link. In particular, we find that, depending on the operating conditions, the current can be a universal function of the relative size between the strength of the impurity and interaction. The low lying many-body states are studied through a quench dynamical protocol that is the atomtronic counterpart of Rabi interferometry. With this approach, we demonstrate how our system defines a two level system of coupled solitonic currents. The current states are addressed through the analysis of the momentum distribution.
title: Ηλεκτρονικός φάκελος ασθενή
title: Electronic health record
titleType: AlternativeTitle
Creators: name: Πετρούτσος, Νικόλαος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Ηλεκτρονικός Φάκελος Ασθενών (ΗΦΑ)
subject: Πληροφοριακά συστήματα υγείας
subject: Χρήστες - πάροχοι υπηρεσιών υγείας

description: Η παρούσα ερευνητική εργασία διεξήχθη στα πλαίσια του μεταπτυχιακού προγράμματος σπουδών του Τμήματος Οικονομικής Επιστήμης, κατεύθυνσης Οικονομικά και Διοίκηση της Υγείας του Πανεπιστημίου Πειραιώς. Αντικείμενο της εργασίας είναι ο Ηλεκτρονικός Φάκελος Ασθενή. Η έννοια του Ηλεκτρονικού Φακέλου Ασθενή έχει αναπτυχθεί στα πλαίσια του γνωστικού αντικειμένου των επιστημών της υγείας, της διοίκησης μονάδων υγείας και της πληροφορικής στην υγεία. Για την προσέγγιση του σκοπού της εργασίας τέθηκαν δύο στόχοι. Αρχικά, διερευνήθηκαν στη βιβλιογραφία οι λόγοι, που οδήγησαν στον Ηλεκτρονικό Φάκελο Ασθενή και τα δεδομένα, σχετικά με το βαθμό ανάπτυξής διεθνώς και ειδικά στην Ελλάδα. Ο δεύτερος στόχος ήταν η διεξαγωγή περιγραφικής ανάλυσης και ο σχολιασμός των αποτελεσμάτων σε μελέτη περίπτωσης που διεξήχθη σε φορέα παροχής υπηρεσιών υγείας, για να τεκμηριωθεί η χρησιμότητα της εφαρμογής του Ηλεκτρονικού Φακέλου Ασθενή. Η έκθεση της ερευνητικής μας προσπάθειας, δομήθηκε σε τέσσερα κεφάλαια και ένα συμπερασματικό τμήμα, πλην της παρούσας περίληψης. Στο πρώτο κεφάλαιο, παρουσιάζεται o Ιατρικός Φάκελος Ασθενή, η εμφάνιση του, τα δυνατά και αδύνατα σημεία του και μια ιστορική αναδρομή, ενώ στο δεύτερο κεφάλαιο παρουσιάζεται ο Ηλεκτρονικός Φάκελος Ασθενή, όπου και τεκμηριώνεται η διαπίστωση της χρησιμότητας και της αλλαγής που έχει επιφέρει. Ακολούθως, παρατίθεται η εννοιολόγηση και η λειτουργικοποίηση του Ηλεκτρονικού Φακέλου Ασθενή στους ενδιαφερόμενους, όπως χρησιμοποιήθηκε στη περιγραφική μας ανάλυση. Στο τρίτο κεφάλαιο, παρουσιάζονται εφαρμογές του Ηλεκτρονικού Φακέλου Ασθενή στα νοσοκομεία αλλά και σε γενικό επίπεδο και στο τέταρτο κεφάλαιο παρουσιάζεται λεπτομερώς η ερευνητική διαδικασία, πληροφορίες για το νοσοκομείο που διεξήχθη η έρευνα και σχολιασμός των ευρημάτων, συμπεριλαμβανομένης της μεθοδολογίας έρευνας. Στο δε πέμπτο κεφάλαιο, συνοψίζονται οι στόχοι της εργασίας και τα εξαγόμενα συμπεράσματα.
Damage mechanisms and mechanical properties of high-strength multiphase steels
Creators: name: Clausmeyer, Till
name: Tekkaya, A. Erman
name: Heibel, Sebastian
name: Dettinger, Thomas
name: Nester, Winfried
Publisher: name: Technische Universität Dortmund
Year: 2018
Subjects: subject: Damage
subject: AHSS
subject: UHSS
subject: Global formability
subject: Local formability
subject: Damage tolerance
subject: Bendability
subject: Fracture
subject: Damage mechanics
subject: Edge-crack sensitivity
subject: 620
subject: 670
subject: Werkstoffschädigung
subject: Kohlenstoffstahl
subject: Ultrahochfester Stahl
subject: Formänderungsvermögen
subject: Schadenstoleranz
subject: Biegefestigkeit
subject: Bruch
subject: Schadensmechanik
subject: Riss

description: The usage of high-strength steels for structural components and reinforcement parts is inevitable for modern car-body manufacture in reaching lightweight design as well as increasing passive safety. Depending on their microstructure these steels show differing damage mechanisms and various mechanical properties which cannot be classified comprehensively via classical uniaxial tensile testing. In this research, damage initiation, evolution and final material failure are characterized for commercially produced complex-phase (CP) and dual-phase (DP) steels in a strength range between 600 and 1000 MPa. Based on these investigations CP steels with their homogeneous microstructure are characterized as damage tolerant and hence less edge-crack sensitive than DP steels. As final fracture occurs after a combination of ductile damage evolution and local shear band localization in ferrite grains at a characteristic thickness strain, this strain measure is introduced as a new parameter for local formability. In terms of global formability DP steels display advantages because of their microstructural composition of soft ferrite matrix including hard martensite particles. Combining true uniform elongation as a measure for global formability with the true thickness strain at fracture for local formability the mechanical material response can be assessed on basis of uniaxial tensile testing incorporating all microstructural characteristics on a macroscopic scale. Based on these findings a new classification scheme for the recently developed high-strength multiphase steels with significantly better formability resulting of complex underlying microstructures is introduced. The scheme overcomes the steel designations using microstructural concepts, which provide no information about design and production properties.
description: Materials;Jg. 11, Heft: 5 | S. 761-1-761-34
Quadrupolar Kondo Effect in Non-Kramers Doublet System PrInAg2
Creators: name: Suzuki, Osamu
name: Suzuki, Hiroyuki S.
name: Kitazawa, Hideaki
name: Kido, Giyuu
name: Ueno, Takafumi
name: Yamaguchi, Takashi
name: Nemoto, Yuichi
name: Goto, Terutaka
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We performed ultrasonic measurement on the rare-earth intermetallic compound PrInAg_2 to examine the quadrupolar Kondo effect associated with the non-Kramers Gamma_3 doublet ground state. The characteristic softening of the elastic constant (c_{11}-c_{12})/2 below 10 K in PrInAg_2 is attributed to a Curie term in quadrupolar susceptibility for the quadrupole O_2^2=J_x^2-J_y^2 of the stable Gamma_3 ground state. (c_{11}-c_{12})/2 turns to a slight increase with the -lnT dependence below 0.1 K, which suggests the quenching of the quadrupolar moment in the quadrupolar Kondo state. Under applied magnetic fields of 10 T and 15 T above 8.7 T corresponding to the Kondo temperature T_K of ~ 0.86 K, the behavior of (c_{11}-c_{12})/2 is described in terms of quadrupolar susceptibility for the stable 4f^2 state.
description: PDF, 10pages + 5figures, Strongly Correlated Electrons
Microscopic observation of carrier-transport dynamics in quantum-structure solar cells using a time-of-flight technique
Creators: name: Toprasertpong, Kasidit
name: Kasamatsu, Naofumi
name: Fujii, Hiromasa
name: Kada, Tomoyuki
name: Asahi, Shigeo
name: Wang, Yunpeng
name: Watanabe, Kentaroh
name: Sugiyama, Masakazu
name: Kita, Takashi
name: Nakano, Yoshiaki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this study, we propose a carrier time-of-flight technique to evaluate the carrier transport time across a quantum structure in an active region of solar cells. By observing the time-resolved photoluminescence signal with a quantum-well probe inserted under the quantum structure at forward bias, the carrier transport time can be efficiently determined at room temperature. The averaged drift velocity shows linear dependence on the internal field, allowing us to estimate the quantum structure as a quasi-bulk material with low effective mobility containing the information of carrier dynamics. We show that this direct and real-time observation is more sensitive to carrier transport than other conventional techniques, providing better insights into microscopic carrier transport dynamics to overcome a device design difficulty.
Exploring the surface properties of Transneptunian Objects and Centaurs with polarimetric FORS1/VLT observations
Creators: name: Bagnulo, S.
name: Boehnhardt, H.
name: Muinonen, K.
name: Kolokolova, L.
name: Belskaya, I.
name: Barucci, M. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Polarization is a powerful remote-sensing method to investigate solar system bodies. It is an especially sensitive diagnostic tool to reveal physical properties of the bodies whose observational characteristics are governed by small scatterers (dust, regolith surfaces). For these objects, at small phase angles, a negative polarization is observed, i.e., the electric vector E oscillates predominantly in the scattering plane, contrary to what is typical for rather smooth homogeneous surfaces. The behavior of negative polarization with phase angle depends on the size, composition and packing of the scatterers. These characteristics can be unveiled by modelling the light scattering by the dust or regolith in terms of the coherent backscattering mechanism. We have investigated the surface properties of TNOs and Centaurs by means of polarimetric observations with FORS1 of the ESO VLT. TNOs Ixion and Quaoar, and Centaur Chiron show a negative polarization surge. The Centaur Chiron has the deepest polarization minimum (-1.5 - 1.4%). The two TNOs show differing polarization curves: for Ixion, the negative polarization increases rapidly with phase; for Quaoar, the polarization is relatively small (~ -0.6%), and nearly constant at the observed phase angles. For all three objects, modelling results suggest that the surface contains an areal mixture of at least two components with different single-scatterer albedos and photon mean-free paths.
description: 11 pages, 7 postscript figures, accepted by A&A; astro-ph abstract has been replaced with a more complete one
CHECKLIST GOVERNANCE? ZUR PRUFUNGSQUALITÄT VON ZERTIFIZIERUNGSSYSTEMEN IM AGRIBUSINESS
Creators: name: Schulze, Holger
name: Spiller, Achim
name: Schulze, Holger
name: Spiller, Achim
Publisher: name: Unknown
Year: 2006
Subjects: Agribusiness

description: In den zurückliegenden Jahren haben Zertifizierungsstandards im Agribusiness zunehmend an Relevanz gewonnen. Wesentliche Teile der Wertschöpfungskette sind bereits nach Standards wie QS, IFS oder EurepGap zertifiziert. In der Forschung ist bisher wenig untersucht, ob diese Ansätze tatsächlich eine hohe Kontrollqualität sicherstellen. Der vorliegende Beitrag beruht auf einer Auswertung der Datenbank der QS Qualität und Sicherheit GmbH mit mehr als 72.000 involvierten Betrieben und versucht, erste empirisch gehaltvolle Hypothesen zum Zusammenhang zwischen Prüfungsqualität und institutionellem Framing der Zertifizierung abzuleiten.
Drastic ground state changes induced by Ni substitution in NaxCoO2
Creators: name: Gayathri, N.
name: Premila, M.
name: Bharathi, A.
name: Sastry, V. S.
name: Sundar, C. S.
name: Hariharan, Y.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on the effect of Ni substitution at the Co site on the physical properties of NaxCoO2 system by investigating the series NaxCo1-yNiyO2 (x=0.75, 0
description: 17 pages 9 figures; submitted to Journal Of Phys. Cond. Mat
Personality and intelligence interact in the prediction of academic achievement
Creators: name: Bergold, Sebastian
name: Steinmayr, Ricarda
Publisher: name: Technische Universität Dortmund
Year: 2018
Subjects: subject: Personality factors
subject: Personality facets
subject: Big Five
subject: Intelligence
subject: Personality-intelligence interface
subject: Academic achievement
subject: Grade point average
subject: 150
subject: Intelligenz
subject: Persönlichkeitsforschung

description: Personality predicts academic achievement above and beyond intelligence. However, studies investigating the possible interaction effects between personality and intelligence when predicting academic achievement are scarce, as is the separate investigation of broad personality factors versus narrow personality facets in this context. Two studies with 11th grade students (Study 1: N = 421; Study 2: N = 243) were conducted to close this research gap. The students completed the Intelligence-Structure-Test 2000 R measuring general reasoning ability, and a well-established personality inventory based on the Five Factor Model. Academic achievement was operationalized via Grade Point Average. Using hierarchical regression and moderation analyses, Study 1 revealed that Conscientiousness interacted with intelligence when predicting academic achievement: there was a stronger association between intelligence and academic achievement when students scored higher on the Conscientiousness scale. Study 2 confirmed the findings from Study 1 and also found a moderation effect of Neuroticism (stronger association between intelligence and academic achievement with lower values on the Neuroticism scale). Analyses at the facet level revealed much more differentiated results than did analyses at the domain level, suggesting that investigating personality facets should be preferred over investigating personality domains when predicting academic achievement.
description: Journal of Intelligence : Jg.: 6, Heft: 2 | S. 27-1-27-18;
Superconductivity in a Molecular Metal Cluster Compound
Creators: name: Bakharev, O.
name: Bono, D.
name: Brom, H. B.
name: Schnepf, A.
name: Schnoeckel, H.
name: De Jongh, L. J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Compelling evidence for band-type conductivity and even bulk superconductivity below $T\_{\text{c}}\approx 8$ K has been found in $^{69,71}$Ga-NMR experiments in crystalline ordered, giant Ga$\_{84}$ cluster-compounds. This material appears to represent the first realization of a theoretical model proposed by Friedel in 1992 for superconductivity in ordered arrays of weakly coupled, identical metal nanoparticles.
description: 5 pages, 4 figures
Jointly-Learned State-Action Embedding for Efficient Reinforcement Learning
Creators: name: Pritz, Paul J.
name: Ma, Liang
name: Leung, Kin K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: While reinforcement learning has achieved considerable successes in recent years, state-of-the-art models are often still limited by the size of state and action spaces. Model-free reinforcement learning approaches use some form of state representations and the latest work has explored embedding techniques for actions, both with the aim of achieving better generalization and applicability. However, these approaches consider only states or actions, ignoring the interaction between them when generating embedded representations. In this work, we establish the theoretical foundations for the validity of training a reinforcement learning agent using embedded states and actions. We then propose a new approach for jointly learning embeddings for states and actions that combines aspects of model-free and model-based reinforcement learning, which can be applied in both discrete and continuous domains. Specifically, we use a model of the environment to obtain embeddings for states and actions and present a generic architecture that leverages these to learn a policy. In this way, the embedded representations obtained via our approach enable better generalization over both states and actions by capturing similarities in the embedding spaces. Evaluations of our approach on several gaming, robotic control, and recommender systems show it significantly outperforms state-of-the-art models in both discrete/continuous domains with large state/action spaces, thus confirming its efficacy.
Συσχέτιση της δομής του διοικητικού συμβουλίου με την επένδυση των επιχειρήσεων σε έρευνα και ανάπτυξη
Creators: name: Δεμπεγιώτη, Κανέλλα Ιωάννα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Καινοτομία
subject: Έρευνα και ανάπτυξη
subject: Διοικητικό συμβούλιο

description: Η ολοκλήρωση της διπλωματικής εργασίας χρηματοδοτήθηκε από το ΙΚΥ στο πλαίσιο του «Προγράμματος χορήγησης υποτροφιών για μεταπτυχιακές σπουδές πρώτου κύκλου (Master) στην Ελλάδα με ένταξη στην αγορά εργασίας, στο πλαίσιο συνεργασίας του Ιδρύματος Κρατικών Υποτροφιών (ΙΚΥ) και της Εθνικής Τράπεζας της Ελλάδος (ΕΤΕ), ακαδημαϊκού έτους 2018-2019»
description: Η παρούσα εργασία ερευνά την σχέση που υπάρχει ανάμεσα στην επένδυση για Έρευνα και Ανάπτυξη των επιχειρήσεων και στη σύσταση του διοικητικού συμβουλίου των επιχειρήσεων, παραδείγματος χάριν τον αριθμό των διευθυντών που αποτελούν το διοικητικό συμβούλιο και την αναλογία φύλου. Επιπλέον σκοπός της έρευνας είναι να διερευνηθούν οι προβλεπτικοί παράγοντες της Έρευνας και Ανάπτυξης καθώς επίσης και οι παράμετροι με τους οποίους συνδέεται αυτή. Η έρευνα που διενεργήθηκε αποτέλεσε μια ποσοτική έρευνα, συσχέτισης με χρήση δευτερογενών δεδομένων από 294 εταιρείες της Αμερικής εισηγμένες στο χρηματιστήριο. Το δείγμα των εταιρειών που χρησιμοποιήθηκε στην παρούσα εργασία εκτείνεται χρονικά από το 2010 έως το 2018.
PSYCHOLOGICAL AND PEDAGOGICAL ASPECTS OF WRITING A MUSICAL DICTATION - AS THE BASIS OF MODERN METHODOLOGY OF MUSIC PEDAGOGY.
Creators: name: Veziryan, E.E.
Publisher: name: Zenodo
Year: 2024

description: The main task of musical dictation is the formation of such psychological processes as logical and abstract thinking, attention, attitude, musical memory, which develop such auditory abilities as speed of memorization reaction, competent fixation of musical notation.
DISTORTED PRICES AND PRODUCER EFFICIENCY - ROMANIAN MAIZE
Creators: name: Balint, Borbala
name: Sauer, Johannes
name: Balint, Borbala
name: Sauer, Johannes
Publisher: name: Unknown
Year: 2006
Subjects: subject: Crop Production/Industries
subject: Efficiency
subject: Shadow Cost Frontier
subject: Functional Consistency
subject: Maize
subject: Romania

description: This research aims at shedding empirical light on the relative efficiency of small-scale maize producers in Romania. Farmers in transition countries still face heavily distorted price systems resulting from imperfect market conditions and socioeconomic and institutional constraints. To capture such distortions we formulate a stochastic shadow-cost frontier model to investigate the systematic input-specific allocative inefficiency. We further adjust the underlying cost frontier by incorporating shadow price corrections and subsequently reveal evidence on farm specific technical inefficiency. Different models are estimated due to the imposition of curvature correctness and the effects on the individual efficiency estimates are shown. The empirical results show a relative high technical efficiency of the small-scale farmers but relatively poor scores on systematic input price efficiency. The usage of extension services as well as agricultural training on the farm level are found to have a positive effect on the technical efficiency level of the farms. All model specifications further agree on the negative effect on efficiency with respect to the use of insecticides. The imposition of functional concavity on the shadow cost frontier leads to relative differences in the efficiency estimates of up to 240%.
Locating Ruelle-Pollicott resonances
Creators: name: Butterley, Oliver
name: Kiamari, Niloofar
name: Liverani, Carlangelo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We study the spectrum of transfer operators associated to various dynamical systems. Our aim is to obtain precise information on the discrete spectrum. To this end we propose a unitary approach. We consider various settings where new information can be obtained following different branches along the proposed path. These settings include affine expanding Markov maps, uniformly expanding Markov maps, non-uniformly expanding or simply monotone maps, hyperbolic diffeomorphisms. We believe this approach could be greatly generalized.
description: Final accepted version
Διερεύνηση σχέσης αιτιότητας μεταξύ χρέους μιας χώρας και του γενικού χρηματιστηριακού δείκτη σε ευρωπαϊκές χώρες
Creators: name: Αγγελάκη, Καλλιόπη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Χρονοσειρές
subject: Στασιμότητα
subject: Χρηματιστήριο
subject: Οικονομία
subject: Έλεγχος μοναδιαίας ρίζας
subject: Έλεγχος αιτιότητας κατά Granger
subject: Διανυσματικά Αυτοπαλίνδρομα Υποδείγματα
subject: Υπόδειγμα διόρθωσης λαθών

description: Ο σκοπός της παρούσας διπλωματικής εργασίας είναι η μελέτη της σχέσης μεταξύ του χρέους μιας χώρας και του γενικού χρηματιστηριακού δείκτη σε οκτώ Ευρωπαϊκές Χώρες. Η μελέτη επικεντρώνεται στη διερεύνηση ύπαρξης ή μη αιτιότητας σε βραχυχρόνιο και μακροχρόνιο ορίζοντα μεταξύ των δύο μεταβλητών. Η διαδικασία αυτή πραγματοποιείται με τη χρήση οικονομετρικών τεχνικών όπως οι έλεγχοι μοναδιαίας ρίζας των χρονοσειρών για την εξασφάλισή της στασιμότητάς τους, ο έλεγχος αιτιότητας κατά Granger (1969) για τον προσδιορισμό της βραχυχρόνιας αιτιότητας, ο έλεγχος της συνολοκλήρωσης για τον προσδιορισμό της μακροχρόνιας αιτιότητας και τέλος το υπόδειγμα διόρθωσης λαθών. Για την εφαρμογή χρησιμοποιήθηκαν ετήσιες παρατηρήσεις του λόγου δημόσιου χρέος προς ΑΕΠ και του γενικού χρηματιστηριακού δείκτη τα οποία συλλέχθηκαν από τη βάση δεδομένων «World Bank» και από την ιστοσελίδα «Yahoo Finance». Από τα αποτελέσματα της μελέτης προέκυψε ότι ο γενικός χρηματιστηριακός δείκτης αιτιάζει με μονόδρομη κατεύθυνση το χρέος στις χώρες Αυστρία και Γαλλία, ενώ προέκυψε και το συμπέρασμα ότι για τη χώρα της Πορτογαλίας το χρέος αιτιάζει τον γενικό χρηματιστηριακό δείκτη με μονόδρομη κατεύθυνση και αυτήν τη φορά. Ο έλεγχος της συνολοκλήρωσης έδειξε ότι για τις χώρες Ολλανδία, Βέλγιο, Ελλάδα και Πορτογαλία το χρέος και ο γενικός χρηματιστηριακός δείκτης μακροχρόνια ισορροπούν. Τέλος, με το υπόδειγμα διόρθωσης λαθών προέκυψε μακροχρόνια αιτιότητα με μονόδρομη κατεύθυνση για την χώρα της Πορτογαλία με το λόγο του Χρέους / ΑΕΠ να επηρεάζει τον χρηματιστηριακό δείκτη.
Properties of exchange coupled all-garnet magneto-optic thin film multilayer structures
Creators: name: Nur-E-Alam, Mohammad
name: Vasiliev, Mikhail
name: Kotov, Viacheslav A.
name: Balabanov, Dmitry
name: Akimov, Ilya
name: Alameh, Kamal
Publisher: name: Technische Universität Dortmund
Year: 2015
Subjects: subject: Magneto-optic
subject: Garnet
subject: Multilayer thin films
subject: Magnetic media
subject: Nanophotonics
subject: Integrated optics
subject: 530

description: The effects of exchange coupling on magnetic switching properties of all-garnet multilayer thin film structures are investigated. All-garnet structures are fabricated by sandwiching a magneto-soft material of composition type Bi1.8Lu1.2Fe3.6Al1.4O12 or Bi3Fe5O12:Dy2O3 in between two magneto-hard garnet material layers of composition type Bi2Dy1Fe4Ga1O12 or Bi2Dy1Fe4Ga1O12:Bi2O3. The fabricated RF magnetron sputtered exchange-coupled all-garnet multilayers demonstrate a very attractive combination of magnetic properties, and are of interest for emerging applications in optical sensors and isolators, ultrafast nanophotonics and magneto-plasmonics. An unconventional type of magnetic hysteresis behavior not observed previously in magnetic garnet thin films is reported and discussed.
description: Materials;8(4)
A Chandra Study of the Multi-Component X-ray Emission from the X-shaped Radio Galaxy 3C 403
Creators: name: Kraft, R. P.
name: Hardcastle, M. J.
name: Worrall, D. M.
name: Murray, S. S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present results from a 49.4 ks Chandra/ACIS-S observation of the nearby ($z$=0.059) X-shaped FRII radio galaxy 3C~403. This is the first Chandra observation of an X-shaped radio galaxy, and one of the goals of this pioneering study is to determine the relationship between the X-ray emitting gas and the X-shaped radio morphology. The X-ray isophotes of the hot gas within $\sim3.5''$ of the central galaxy are highly elliptical (eccentricity$\sim$0.57) and co-aligned with the elliptical optical isophotes. This supports the hypothesis that X-shaped radio sources are created by propagation of jets through asymmetric density distributions. Within large uncertainties, there is no evidence that the lobes or wings are overpressurized relative to the ISM. We have detected X-ray emission from several of the radio knots to the E of the active nucleus, and diffuse emission from the radio lobe to the W. The X-ray emission from the eastern knots cannot be explained by an inverse Compton model unless they are far from equipartition. Using archival HST data, optical emission is detected from two knots, and the radio/optical/X-ray spectra are well fitted by simple synchrotron models. This is one of the strongest examples to date of X-ray synchrotron emission from multiple knots in the jet of an FR II radio galaxy. X-ray emission is also detected from the radio wings at a flux consistent with inverse Compton scattering of CMB photons from relativistic electrons if the wings are near equipartition. The nuclear spectrum is well described by a multi-component model that includes a heavily absorbed power law and a bright, broadened Fe line. A second, less absorbed, power-law component, likely to represent unresolved emission from a pc-scale jet, is also required.
description: 35 pages, 12 figures, 3 tables - accepted for publication in the Astrophysical Journal
On Elastic Geodesic Grids and Their Planar to Spatial Deployment
Creators: name: Pillwein, Stefan
name: Leimer, Kurt
name: Birsak, Michael
name: Musialski, Przemyslaw
Publisher: name: arXiv
Year: 2020
Subjects: subject: Graphics (cs.GR)
subject: Differential Geometry (math.DG)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: I.3.5

description: We propose a novel type of planar-to-spatial deployable structures that we call elastic geodesic grids. Our approach aims at the approximation of freeform surfaces with spatial grids of bent lamellas which can be deployed from a planar configuration using a simple kinematic mechanism. Such elastic structures are easy-to-fabricate and easy-to-deploy and approximate shapes which combine physics and aesthetics. We propose a solution based on networks of geodesic curves on target surfaces and we introduce a set of conditions and assumptions which can be closely met in practice. Our formulation allows for a purely geometric approach which avoids the necessity of numerical shape optimization by building on top of theoretical insights from differential geometry. We propose a solution for the design, computation, and physical simulation of elastic geodesic grids, and present several fabricated small-scale examples with varying complexity. Moreover, we provide an empirical proof of our method by comparing the results to laser-scans of the fabricated models. Our method is intended as a form-finding tool for elastic gridshells in architecture and other creative disciplines and should give the designer an easy-to-handle way for the exploration of such structures.
description: 12 pages, 14 figures
DIE SCHATZUNG VERFAHRENSSPEZIFISCHER FAKTOREINSATZMENGEN FUR DIE LANDWIRTSCHAFT IN DEUTSCHLAND
Creators: name: Hansen, Heiko
name: Surry, Yves R.
name: Hansen, Heiko
name: Surry, Yves R.
Publisher: name: Unknown
Year: 2006
Subjects: Agricultural Finance

description: Aus der regionalen landwirtschaftlichen Gesamtrechnung der Länder für die Bundesrepublik Deutschland lässt sich nicht entnehmen, wie sich die Vorleistungen auf einzelne Produktions-verfahren verteilen. Im vorliegenden Beitrag werden mit Hilfe der Maximum-Entropie-Methode verfahrensspezifische Faktoreinsatzmengen aus diesen Daten geschätzt. Die Modell-ergebnisse für die Jahre 1991 bis 2004 zeigen erwartungsgemäß heterogene Koeffizienten für die untersuchten Agrarprodukte. Auffallend ist der starke Rückgang des Einsatzes zugekauf-ter Futtermittel in der Milchproduktion sowie bei Rindern und Kälbern. Der Einsatz innerbe-trieblich erzeugter Futtermittel hat dagegen bei diesen Produktionsverfahren, insbesondere in der Milchproduktion, im Zeitablauf zugenommen.
Reduction of ejection forces in injection molding by applying mechanically post-treated CrN and CrAlN PVD films
Creators: name: Tillmann, Wolfgang
name: Stangier, Dominic
name: Lopes Dias, Nelson Filipe
name: Gelinski, Nikolai
name: Stanko, Michael
name: Stommel, Markus
name: Krebs, Eugen
name: Biermann, Dirk
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Injection molding
subject: Ejection forces
subject: Physical vapor deposition
subject: Post-treatment
subject: CrN
subject: CrAlN
subject: 620
subject: 670

description: In injection molding, the reduction of ejection forces is a process relevant aspect to improve the production rates. For this purpose, CrN and CrAlN films were sputtered on cylindrical and quadratic AISI H11 cores of an injection mold in order to investigate their influence on the resulting ejection forces to demold polypropylene test components. Within this context, the ejection forces of the PVD coated cores were compared to those of uncoated cores made of AISI H11. For both the cylindrical and quadratic cores, the as-deposited CrN and CrAlN films exhibit higher ejection forces than the uncoated cores due to the increase of the roughness profile after sputtering. It is known that the ejection forces are directly related to the surface roughness. In order to ensure comparable surface conditions to the uncoated surfaces, and to demonstrate the potential of PVD coated mold surfaces when reducing the ejection forces, the coated surfaces were mechanically post-treated to obtain a similar roughness profile as the uncoated cores. The combination of a PVD deposition and post-treatment ensures a significant reduction of the ejection forces by 22.6% and 23.7% for both core geometries.
description: J. Manuf. Mater. Process.;3(4)
Nanodiamond dust and the far-ultraviolet quasar break
Creators: name: Binette, L.
name: C., G. Magris
name: Krongold, Y.
name: Morisset, C.
name: Haro-Corzo, S.
name: de Diego, J. A.
name: Mutschke, H.
name: Andersen, A. C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We explore the possibility that the steepening observed shortward of 1000A in the energy distribution of quasars may result from absorption by dust, being either intrinsic to the quasar environment or intergalactic. We find that a dust extinction curve consisting of nanodiamonds, composed of terrestrial cubic diamonds or with surface impurities as found in carbonaceous chondrite meteorites, such as Allende, is successful in reproducing the sharp break observed. The intergalactic dust model is partially successful in explaining the shape of the composite energy distribution, but must be discarded in the end, as the amount of crystalline dust required is unreasonable and would imply an improbable fine tuning among the dust formation processes. The alternative intrinsic dust model requires a mixture of both cubic diamonds and Allende nanodiamonds and provide a better fit of the UV break. The gas column densities implied are of the order 10^{20} cm^{-2} assuming solar metallicity for carbon and full depletion of carbon into dust. The absorption only occurs in the ultraviolet and is totally negligible in the visible. The minimum dust mass required is of the order ~ 0.003 r_{pc}^{2}M_o, where r_{pc} is the distance in parsec between the dust screen and the continuum source. The intrinsic dust model reproduces the flux {\it rise} observed around 660A in key quasar spectra quite well. We present indirect evidence of a shallow continuum break near 670A (18.5 eV), which would be intrinsic to the quasar continuum.
description: 13 COLOR figures, 6 BW figures, ACCEPTED in ApJ (June 2005)
LEBENSMITTELKONSUMSTIL ALS SEGMENTIERUNGSANSATZ FUR VERBRAUCHERPRAFERENZEN GEGENUBER INNOVATIVEN LEBENSMITTELPRODUKTEN
Creators: name: Sparke, Kai
name: Menrad, Klaus
name: Sparke, Kai
name: Menrad, Klaus
Publisher: name: Unknown
Year: 2006
Subjects: Food Consumption/Nutrition/Food Safety

description: Die Einbindung von Verbraucherforschung in den Produktentwicklungsprozess erhöht die Erfolgswahrscheinlichkeit neuer Lebensmittelprodukte. Dabei hat die Segmentierung der Verbraucher besondere Bedeutung. Vermehrt werden zur Segmentierung der Konsumenten Lebensstilaspekte herangezogen. Ziel der vorliegenden Arbeit war die Entwicklung und Ü-berprüfung eines Befragungsinstruments zur Ermittlung des Lebensmittelkonsumstils der Verbraucher. In Anlehnung an die Imageryforschung dienten bildliche Darstellungen ver-schiedener Speisen und Lebensmittel als Bewertungsstimuli für 327 Verbraucher und als Va-riablen einer darauf folgenden Clusteranalyse. Es wurden zehn Lebensmittelkonsumstile seg-mentiert, die sich auch bezüglich soziodemografischer Merkmale unterscheiden. Die Segmen-tierungsmethodik erwies sich als konsistent und bietet somit die Möglichkeit der einfachen und zugleich effektiven Einsatzes im Rahmen der Neuproduktentwicklung und des Marke-tings der Lebensmittelindustrie.
Strong field induced electron density tide in high harmonic generation from solids
Creators: name: Li, Liang
name: Zhang, Yinfu
name: Lan, Pengfei
name: Huang, Tengfei
name: Zhu, Xiaosong
name: Zhai, Chunyang
name: Yang, Ke
name: He, Lixin
name: Zhang, Qingbin
name: Cao, Wei
name: Lu, Peixiang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: In strong laser fields, the electron density in solids can show up tidal motions caused by the laser ``pulling'' on the electrons, which forms an electron density tide (EDT). However, the strong field processes in solids are always explained by the single-active-electron (SAE) model and the fluctuation of background electrons is neglected previously. Here, we demonstrate the strong field induced EDT effect and propose a model for revealing its role in high harmoinc generation (HHG) from solids. We show that the EDT effect induces an additional polarization current beyond the SAE approximation. It gives a new mechanism for HHG and leads to new anisotropic structures, which are experimentally observed with MgO. Our experiment indicates that the EDT effect becomes more obvious with increasing the laser intensity. Our work establishes the bridge between the HHG and the microscopic EDT in solids induced by the strong laser field, which paves the way to probe the ultrafast electron dynamics.
WHY AND HOW SHOULD THE GOVERNMENT FINANCE PUBLIC GOODS IN RURAL AREAS? A REVIEW OF ARGUMENTS
Creators: name: Petrick, Martin
name: Petrick, Martin
Publisher: name: Unknown
Year: 2006
Subjects: subject: Public Economics
subject: Rural areas
subject: public goods
subject: institutions
subject: agricultural policy reform

description: This paper reviews three arguments why government should not directly finance public goods provision in the countryside: (1) sorting and voting of residents leads to efficient local public goods provision, (2) community governance may better cope with incomplete contracting in public goods, and (3) public provision drives out voluntary private provision of public goods. Theory and empirical evidence partly support these arguments. The adequate level of rural governance appears to be often below the European or national level, and policy should focus on the institutional premises of public goods provision rather than on centralized payments to public good providers.
AGRICULTURAL EMPLOYMENT TRENDS IN AN ENLARGED EUROPEAN UNION: DOES THE CAP REFORM / INTRODUCTION MATTER?
Creators: name: Baum, Sabine
name: Cook, Peter
name: Stange, Henriette
name: Weingarten, Peter
name: Baum, Sabine
name: Cook, Peter
name: Stange, Henriette
name: Weingarten, Peter
Publisher: name: Unknown
Year: 2006
Subjects: subject: Agricultural and Food Policy
subject: Agricultural labor market
subject: agricultural policy
subject: European Union
subject: transition countries
subject: case studies.

description: In the course of economic development there is a general downward trend of agricultural employment. In the EU-15, agricultural employment decreased by 2.3% p.a. (measured in regular persons) and 3.0% p.a. (measured in annual working units) between 1995 and 2000. In some of the new EU Member States, employment in agriculture plummeted in the early 1990s, whereas in others it increased during the first years of transition and has served as a social buffer in times of economic hardship. The most important determinants of agricultural employment changes are labor saving technical progress, the macroeconomic environment, the farm structure, socio-economic characteristics of the farmer and agricultural support policies. Currently, farmers in the enlarged EU are facing significant policy changes, both in the EU-15 (2003 CAP reform) and in the new Member States (CAP introduction). The results of 15 case studies assessing the future development of agricultural employment and the impact of CAP reform/introduction confirm the general downward trend which overall will not be much affected by these policy changes. However, the case studies also reveal significant differences between regions and enterprises.