cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Effect of high temperature heat treatments on the quality factor of a large-grain superconducting radio-frequency niobium cavity
Creators: name: Dhakal, P.
name: Ciovati, G.
name: Myneni, G. R.
name: Gray, K. E.
name: Groll, N.
name: Maheshwari, P.
name: McRae, D. M.
name: Pike, R.
name: Proslier, T.
name: Stevie, F.
name: Walsh, R. P.
name: Yang, Q.
name: Zasadzinzki, J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Large-grain Nb has become a viable alternative to fine-grain Nb for the fabrication of superconducting radio-frequency cavities. In this contribution we report the results from a heat treatment study of a large-grain 1.5 GHz single-cell cavity made of "medium purity" Nb. The baseline surface preparation prior to heat treatment consisted of standard buffered chemical polishing. The heat treatment in the range 800 - 1400 C was done in a newly designed vacuum induction furnace. Q0 values of the order of 2x1010 at 2.0 K and peak surface magnetic field (Bp) of 90 mT were achieved reproducibly. A Q0-value of (5+-1)1010 at 2.0 K and Bp = 90 mT was obtained after heat treatment at 1400 C. This is the highest value ever reported at this temperature, frequency and field. Samples heat treated with the cavity at 1400 C were analyzed by secondary ion mass spectrometry, secondary electron microscopy, energy dispersive X-ray, point contact tunneling and X-ray diffraction and revealed a complex surface composition which includes titanium oxide, increased carbon and nitrogen content but reduced hydrogen concentration compared to a non heat-treated sample.
title: Οι επιπτώσεις της πανδημίας λόγω COVID-19 στις μετακινήσεις στην Αττική
title: The effects of the pandemic due to COVID-19 on transportation in Attica
titleType: AlternativeTitle
Creators: name: Μπώκου, Αγγελική
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Αστική κινητικότητα
Μέσα μαζικής μεταφοράς
Πανδημία
Covid-19
Ελλάδα
Αττική

description: Η πανδημία λόγω COVID-19, μια παγκόσμια κρίση υγείας, έχει αλλάξει ριζικά τα αστικά τοπία και τις καθημερινές συνήθειες παγκοσμίως. Η παρούσα διπλωματική εργασία διερευνά τον αντίκτυπο που είχε η πανδημία στους κατοίκους της Αττικής, δίνοντας ιδιαίτερη έμφαση στα πρότυπα αστικής κινητικότητας και πως αυτά επηρεάστηκαν. Καθώς η πανδημία απαιτούσε γρήγορες και ριζικές αλλαγές στη δημόσια υγεία και τις πολιτικές μεταφορών, αυτή η έρευνα εξετάζει πώς τα μέτρα που πάρθηκαν από την πολιτεία για τον περιορισμό της εξάπλωσης της πανδημίας επηρέασαν συνολικά τις συμπεριφορές μετακίνησης. Βασιζόμενη σε υφιστάμενες μελέτες ανά τον κόσμο, η έρευνα που εκπονήθηκε στο πλαίσιο της διπλωματικής εργασίας συνδυάζει και έρευνα πεδίου που πραγματοποιήθηκε σε ένα δείγμα 230 κατοίκων της Αττικής. Κύριος στόχος είναι ο προσδιορισμός των αλλαγών στην αστική κινητικότητα κατά τη διάρκεια όλων των διαφορετικών φάσεων της πανδημίας (πριν, κατά τη διάρκεια και μετά), αναλύοντας παράγοντες, όπως αλλαγές στη συχνότητα, το μέσο και τους σκοπούς μετακινήσεων. Η βιβλιογραφική ανασκόπηση έδειξε μεγάλη πτώση τόσο στην συνολική κινητικότητα (περίπου 50-60%), όσο και στη χρήση δημόσιων συγκοινωνιών (περίπου 80%). Η έρευνα της παρούσας εργασίας έδειξε ότι η πανδημία προκάλεσε σημαντικές αλλαγές στο τοπίο της αστικής κινητικότητας στην Αττική. Ενδεικτικά, η επιβατική κίνηση στα μέσα μαζικής μεταφοράς μειώθηκε κατά 37,41% και οι καθημερινές μετακινήσεις μειώθηκαν κατά 39,24%. Επιπλέον, ο φόβος για τον κορονοϊό φάνηκε να αυξάνει έως και 4 φορές την μακροπρόθεσμη μεταβολή συνηθειών μετακίνησης. Η παρούσα διπλωματική εργασία αποτελεί αρωγό στην κατανόηση των επιπτώσεων μιας πανδημίας στις αστικές μετακινήσεις και θα μπορούσε να χρησιμοποιηθεί ως βάση για εκπόνηση περαιτέρω ερευνών και μελετών οικονομικού, κοινωνικού και περιβαλλοντικού ενδιαφέροντος, με σκοπό την επίτευξη ασφαλούς και αποτελεσματικής διαχείρισης καταστάσεων σε περιόδους κρίσεων.
Magnomechanical backaction corrections due to coupling to higher order Walker modes and Kerr nonlinearities
Creators: name: Bittencourt, V. A. S. V.
name: Potts, C. A.
name: Huang, Y.
name: Davis, J. P.
name: Kusminskiy, S. Viola
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The radiation pressure-like coupling between magnons and phonons in magnets can modify the phonon frequency (magnomechanical spring effect) and decay rate (magnomechanical decay) via dynamical backaction. Such effects have been recently observed by coupling the uniform magnon mode of a magnetic sphere (the Kittel mode) to a microwave cavity. In particular, the ability to evade backaction effects was demonstrated [C.A. Potts et al., arXiv:2211.13766 [quant-ph] (2022)], a requisite for applications such as magnomechanical based thermometry. However, deviations were observed from the predicted magnomechanical decay rate within the standard theoretical model. In this work, we account for these deviations by considering corrections due to (i) magnetic Kerr nonlinearities and (ii) the coupling of phonons to additional magnon modes. Provided that such additional modes couple weakly to the driven cavity, our model yields a correction proportional to the average Kittel magnon mode occupation. We focus our results on magnetic spheres, where we show that the magnetostatic Walker modes couple to the relevant mechanical modes as efficiently as the Kittel mode. Our model yields excellent agreement with the experimental data.
description: 19 pages, 9 figures
A Fractal Comparison of Escher and Koch Tessellations
Creators: name: Van Dusen, Ben
name: Scannel, Billy
name: Taylor, Richard
Publisher: name: arXiv
Year: 2012
Subjects: subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: M.C. Eschers tessellations have captured the imaginations of both artists and mathematicians. Circle Limit III is the most intricate of his tessellations, featuring patterns that repeat at increasingly fine scales. Although his patterns follow a scaling law determined by hyperbolic geometry, his work is often mistakenly described as following fractal geometry. Here, we perform a 'box counting' scaling analysis on Circle Limit III and an equivalent monofractal pattern based on a Koch Snowflake. Whereas our analysis highlights the expected visual differences between Eschers hyperbolic patterns and the simple monofractal, the analysis also identifies unexpected similarities between Eschers work and the bifractal poured paintings of Jackson Pollock.
description: 19 pages
Xps Study Of Cleaning Procedures Of Zno (0001), (000-1), (10-10) Surfaces
Creators: name: Kumarappan Kumar
name: Hughes, Greg
name: McGlynn, Enda
name: Biswas, Mahua
Publisher: name: Zenodo
Year: 2008
Subjects: ZnO
XPS
Surface Cleaning
Surface contamination
Semiconductor
Surface Science
Photoelectron Spectroscopy
Materials Characterization

description: Poster presented in 14th International Conference on Solid Films and Surfaces (ICSFS-14), Trinity College Dublin, Ireland.
Transport in Graphene superimposed by a moving Electrical Superlattice Potential
Creators: name: Dietel, Jürgen
name: Kleinert, Hagen
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We calculate dc-conductivities of ballistic graphene undulated by a overlying moving unidirectional electrical superlattice (SL) potential whose SL-velocity is smaller than the electron velocity. We obtain no dependence of the conductivity on the velocity along the direction of the superlattice wavevector. In the orthogonal direction however, the dependence is strong on the velocity especially at voltages where a new Dirac point emerges for zero velocity. It is shown that the infinite graphene system can serve as an ideal motion detector at potentials where the first new Dirac point emerges. There the conductivity is zero at vanishing SL velocities and jumps to infinity when the SL starts moving. For finite systems at voltages where the number of new Dirac points is of the order of the ratio of the electron velocity by the SL-velocity, the modifications to the conductivity of a moving SL is at least of similar magnitude as the conductivity of the stagnant SL.
description: 10 pages, 3 figures, Appendix B added, version published in PRB
Der flächendeckende Mindestlohn
Creators: name: Knabe, Andreas
name: Schöb, Ronnie
name: Thum, Marcel
Publisher: name: Freie Universität Berlin
Year: 2014
Subjects: subject: Flächendeckender Mindestlohn
subject: Beschäftigungsverluste
subject: Verteilungsgerechtigkeit
subject: 300 Sozialwissenschaften::330 Wirtschaft
subject: 300 Sozialwissenschaften::330 Wirtschaft::331 Arbeitsökonomie

description: Die Einführung des flächendeckenden gesetzlichen Mindestlohns von 8,50 Euro ist ein großes, mit vielen sozialpolitischen Risiken verbundenes Experiment. Dieser Übersichtsartikel zeigt, dass weder die unterschiedlichen theoretischen Erklärungsmodelle noch die große Anzahl empirischer Arbeiten aus anderen Ländern die Hoffnung rechtfertigen, der Mindestlohn würde in Deutschland nicht zu substantiellen Beschäftigungsverlusten führen. Unsere Simulationsrechnung zeigt, dass bei einem Mindestlohn von 8,50 Euro – unabhängig vom unterstellten Arbeitsmarktszenario – substantielle Beschäftigungsverluste drohen. Besonders stark betroffen sind die heutigen Aufstocker, die von der Mindestlohnerhöhung kaum etwas mit nach Hause nehmen können, aber in Zukunft einem ungleich höheren Arbeitsplatzrisiko ausgesetzt sind. Diese Befunde lassen zweifeln, dass die Politik mit dem Mindestlohn ihre erklärten Ziele einer erhöhten Verteilungsgerechtigkeit und der Entlastung der öffentlichen Haushalte erreichen kann.
Scaling of entanglement entropy across Lifshitz transitions
Creators: name: Rodney, Marlon
name: Song, H. Francis
name: Lee, Sung-Sik
name: Hur, Karyn Le
name: Sorensen, Erik
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the scaling of the bipartite entanglement entropy across Lifshitz quantum phase transitions, where the topology of the Fermi surface changes without any changes in symmetry. We present both numerical and analytical results which show that Lifshitz transitions are characterized by a well-defined set of critical exponents for the entanglement entropy near the phase transition. In one dimension, we show that the entanglement entropy exhibits a length scale that diverges as the system approaches a Lifshitz critical point. In two dimensions, the leading and sub-leading coefficients of the scaling of entanglement entropy show distinct power-law singularities at critical points. The effect of weak interactions is investigated using the density matrix renormalization group algorithm.
description: 11 pages, 11 figures; v2) references added
PDM KG-Coulombic particles in cosmic string rainbow gravity spacetime and a uniform magnetic field
Creators: name: Mustafa, Omar
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Klein-Gordon (KG) particles in cosmic string rainbow gravity spacetime and a uniform magnetic field are studied in the context of the so called, metaphorically speaking, position-dependent mass (PDM) settings. We show that the corresponding KG-equation collapses into a two-dimensional radial Schrödinger-Coulomb like model. The exact textbook solution of which is used to find the energies and wave functions of KG-Coulombic particles (both constant mass and PDM ones). In so doing, we consider, with $y=E/E_{P}$, four pairs of rainbow functions: (a) $% g_{_{0}}\left( y\right) =1$, $g_{_{1}}\left( y\right) =\sqrt{1-εy^{2}% }$, (b) $g_{_{0}}\left( y\right) =1$, $g_{_{1}}\left( y\right) =\sqrt{% 1-εy}$, (c) $g_{_{0}}\left( y\right) =g_{_{1}}\left( y\right) =\left( 1-εy\right) ^{-1}$, and (d) $g_{_{0}}( y) =(e^{εy}-1) /εy$, $g_{_{1}}\left( y\right) =1$. Interestingly, we observe that the first pair in (a) introduces the Planck energy $E_{p}$ as a maximum possible KG-particle/antiparticle energy value.
description: 14 pages, 8 figures. arXiv admin note: substantial text overlap with arXiv:2301.05464
Mass Of The Vector Meson In Quantum Chromodynamics In The Limit Of Large Number Of Colors
Creators: name: Patel, Rahul
name: Prays, Carlos
name: Narayanan, Rajamani
name: Hietanen, Ari
Publisher: name: Zenodo
Year: 2015
Subjects: vector meson
large N
lattice QCD

description: Thesis presentation to the physics department at Florida International University on my independent study with Dr. Rajamani Narayanan on determining the mass of a vector meson in the limit of large colors.
Multimode entanglement in coupled cavity arrays
Creators: name: Liew, Timothy C. H.
name: Savona, Vincenzo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study a driven-dissipative array of coupled nonlinear optical resonators by numerically solving the Von Neumann equation for the density matrix. We demonstrate that quantum correlated states of many photons can be generated also in the limit where the nonlinearity is much smaller than the losses, contrarily to common expectations. Quantum correlations in this case arise from interference between different pathways that the system can follow in the Hilbert space to reach its steady state under the effect of coherent driving fields. We characterize in particular two systems: a linear chain of three coupled cavities and an array of eight coupled cavities. We demonstrate the existence of a parameter range where the system emits photons with continuous-variable bipartite and quadripartite entanglement, in the case of the first and the second system respectively. This entanglement is shown to survive realistic rates of pure dephasing and opens a new perspective for the realization of quantum simulators or entangled photon sources without the challenging requirement of strong optical nonlinearities.
description: 20 pages, 7 figures
BREXIT: Το bras de fer με την Ευρώπη
Creators: name: Σεμπέκου, Αντωνία-Αικατερίνη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Ηνωμένο Βασίλειο
subject: Brexit
subject: Ευρωπαϊκή Ένωση
subject: Ιρλανδικό σύνορο

description: Το αποτέλεσμα του βρετανικού δημοψηφίσματος που διεξήχθη στις 23 Ιουνίου 2016 σχετικά με την συμμετοχή στην Ευρωπαϊκή Ένωση, μολονότι ήταν αναμενόμενο, προκάλεσε ανησυχία τόσο στην ίδια την χώρα όσο και στην υπόλοιπη Ένωση. Η βιβλιογραφική μελέτη απεικονίζει το αίσθημα της «υπέροχης απομόνωσης» ως το κυρίαρχο κατάλοιπο της βρετανικής αυτοκρατορίας στην συνείδηση και την ιστορία των πολιτών της, ενώ σύντομα εκδηλώθηκε έντονος σκεπτικισμός σχετικά με την λειτουργία του ευρωπαϊκού οικοδομήματος. Η ανεξέλεγκτη μετανάστευση, η υπακοή σε κανόνες που δεν λειτουργούσαν πολλές φορές προς το οικονομικό συμφέρον της χώρας και η ύπαρξη δημοκρατικού ελλείμματος στους θεσμούς αποτέλεσαν βασικούς παράγοντες για τη διαμόρφωση της ψήφου. Διάθεση ευρωσκεπτικισμού και ανάγκης αυτονομίας είχε διαφανεί από τα πρώτα χρόνια της ένταξης στην ΕΟΚ, καθώς το εν λόγω δημοψήφισμα δεν ήταν το πρώτο που πραγματοποιήθηκε στο Ηνωμένο Βασίλειο κατά τη διάρκεια των σαράντα τριών χρόνων της βρετανικής συμμετοχής. Η διαδικασία της αποχώρησης ήταν μακροχρόνια και η διαπραγμάτευση πολυσχιδής. Το Brexit αποτελεί μοναδικό γεγονός, καθώς είναι η πρώτη χώρα που αποφασίζει να κινηθεί προς την κατεύθυνση της εξόδου. Παρόλο που υπήρχε το θεσμικό πλαίσιο που ρύθμιζε τον τρόπο αποχώρησης ενός κράτους – μέλους από την Ευρωπαϊκή Ένωση, δεν είχε δημιουργηθεί μέχρι εκείνη τη στιγμή η ανάγκη εφαρμογής του. Η περίπτωση του Ηνωμένου Βασιλείου είναι αρκετά ιδιαίτερη, λόγω των διαφορετικών εθνών που περιλαμβάνει. Η έκβαση του δημοψηφίσματος καταδεικνύει την έντονη διχογνωμία που υπάρχει εντός του Ηνωμένου Βασιλείου, με την Αγγλία και την Ουαλία να έχουν ταχθεί υπέρ της αποχώρησης, ενώ η πλειοψηφία της Σκωτίας και της Βόρειας Ιρλανδίας υπέρ της παραμονής. Παράλληλα, το δυσεπίλυτο πρόβλημα του ιρλανδικού συνόρου ταλάνισε για πολύ καιρό τις διαπραγματευόμενες πλευρές. Η συμβιβαστική λύση που συμφωνήθηκε με σκοπό να αποτραπεί η δημιουργία ενός «σκληρού συνόρου» στο νησί της Ιρλανδίας δεν είναι ευρέως αποδεκτή στη Βόρεια Ιρλανδία. Mε αποτέλεσμα να ελλοχεύει ο κίνδυνος αφενός της ανατροπής των ειρηνευτικών προσπαθειών τόσο των κυβερνήσεων Ηνωμένου Βασιλείου και Δημοκρατίας της Ιρλανδίας, όσο και της Ευρωπαϊκής Ένωσης και αφετέρου μιας ενδεχόμενης βίαιης σύγκρουσης, ή ακόμη και απόσχισης.
An Evolutionary Algorithm Based Optimization of Neural Ensemble Classifiers
Creators: name: Chiu, C
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 400303
subject: Biomechanical engineering

description: Ensemble classifiers are approaches which train multiple classifiers and fuse their decisions to produce the final decision. The training process in an Ensemble classifier aims at producing the base classifiers in such a way that they are accurate but also differs from each other in terms of the errors they made on identical patterns. Although Ensemble classifiers are very useful and can be applied to many real world applications for classifying unseen data patterns into one of the known or unknown classes, there are many problems facing the Ensemble classifiers such as finding the appropriate number of layers, clusters or even base classifiers which can produce the best level of diversity and accuracy. There has been very little research conducted in this area. In addition, there is also a lack of automatic approach to find these parameters. This thesis presents a Multi-Layered Ensemble Classifier and the Evolutionary Algorithm Based Optimization (EABO) approaches to identify the optimal number of layers and clusters in the Multi-Layered Neural Ensemble Classifiers. This thesis focuses on the following research issues. Firstly it proposes a Multi-Layered Neural Ensemble Classifier and a Single-Objective Evolutionary Algorithm Based Optimization approach to optimize the Ensemble parameters. It investigates an approach for finding the impact of parameters such as attributes, instances and classes on clusters, accuracy and diversity. Secondly it investigates the relationship among clusters, layers, diversity and size of dataset using the Neural Ensemble Abstract iii | P a g e Classifiers. This is to see whether or not there is any relationship between the number of clusters in the Ensemble Classifier and the data size. Finally this research presents and investigates a Multi-Objective Evolutionary Algorithm Based Optimization (MOEABO) approach for optimizing the Multi-Layered Neural Ensemble Classifiers. The proposed approaches are evaluated on the University of California at Irvine (UCI) machine learning repository benchmark data sets. The results show that the proposed EABO approach is better than the Bagging and Boosting Ensemble classifiers. The results show that the maximum number of clusters is influenced by decrementing the number of instances in the data set. The results also show the impact of variability in data which can produce the best level of diversity and accuracy. The findings provide a better understanding of the relationships between clusters in Ensemble and the level of accuracy and diversity. Finally, the results show that the proposed MOEABO approach achieves a better performance than the Bagging, Boosting, EABO and NULCOEC. A comparative analysis of the results using the proposed approaches and recently published approaches in the literature is presented in this thesis.
title: "Welfare magnetism" in the EU-15?
title: Why the EU enlargement did not start a race to the bottom of welfare states
titleType: Subtitle
Creators: name: Skupnik, Christoph
Publisher: name: Freie Universität Berlin
Year: 2013
Subjects: subject: Determinants of migration flows
subject: EU enlargement
subject: welfare magnet
subject: 300 Sozialwissenschaften::330 Wirtschaft::337 Weltwirtschaft
subject: 300 Sozialwissenschaften::330 Wirtschaft

description: According to the “welfare magnet” hypothesis, migrants with a high likelihood of claiming benefits cluster in the most generous welfare systems. After the introduction of the freedom of movement for Eastern European workers, EU-15 countries can thus be expected to reduce public benefits in order to avoid becoming “welfare magnets”. However, OECD data on benefits do not support the prediction of a race to the bottom in protection levels. Using data from the EU-LFS 2004 to 2011, I analyze the determinants of migration flows and find that, in contrast to theory, welfare state variables do not significantly affect migration flows when controlling for temporary political restrictions of the freedom of movement (2+3+2 rule). This explains why the pressure to modify national welfare spending is small. Furthermore, evidence is found that the restrictions completely offset the incentive effects of work-related pull factors and thereby hamper an efficient allocation of labor across national borders.
title: Διαδίκτυο των αισθήσεων
title: Internet of Senses
titleType: AlternativeTitle
Creators: name: Μπουμπουρέκας, Ιωάννης
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Internet of Senses
subject: Internet of Things
subject: ΙοΤ
subject: IoS
subject: Νέες τεχνολογίες
subject: Έξυπνες πόλεις

description: Το Διαδίκτυο των αισθήσεων και η κοινή επικοινωνία και ανίχνευση είναι δύο αναδυόμενα παραδείγματα που διαθέτουν τεράστιες δυνατότητες για την ενίσχυση της βιωσιμότητας σε διάφορους τομείς. Το Διαδίκτυο των αισθήσεων στοχεύει να φέρει επανάσταση στην αλληλεπίδραση ανθρώπου-υπολογιστή, επιτρέποντας την απρόσκοπτη ενσωμάτωση των αισθήσεών μας με τα ψηφιακά συστήματα. Μέσω της απτικής ανατροφοδότησης, της επαυξημένης πραγματικότητας και των καθηλωτικών εμπειριών, οι χρήστες μπορούν να εμπλακούν με εικονικά περιβάλλοντα, προωθώντας βιώσιμες πρακτικές όπως η συνεργασία από απόσταση και η μείωση των φυσικών μετακινήσεων. Από την άλλη πλευρά, η Κοινή Επικοινωνία και Ανίχνευση περιλαμβάνει διασυνδεδεμένες συσκευές και δίκτυα που συλλέγουν και αναλύουν συλλογικά δεδομένα για τη βελτίωση της διαχείρισης των πόρων και της βιωσιμότητας. Με την ανταλλαγή πληροφοριών και το συντονισμό δράσεων, τα συστήματα αυτά μπορούν να βελτιστοποιήσουν την κατανάλωση ενέργειας, να βελτιώσουν τη ροή της κυκλοφορίας και να επιτρέψουν την αποτελεσματική χρήση των πόρων, συμβάλλοντας έτσι σε ένα πιο βιώσιμο μέλλον. Μαζί, το Διαδίκτυο των αισθήσεων και η κοινή επικοινωνία και αισθητοποίηση προσφέρουν νέες προσεγγίσεις για την προώθηση της βιωσιμότητας, δίνοντας τη δυνατότητα σε άτομα και οργανισμούς να λαμβάνουν ενημερωμένες αποφάσεις και να υιοθετούν πρακτικές με περιβαλλοντική συνείδηση
P. Saxl, Lectures. London, The Warburg Institute - Fritz Saxl, a volume of memorial essays from his friends in England
Creators: name: Badt, Kurt
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2019

description: Rezension zu: P. Saxl, Lectures. London, The Warburg Institute, University of London, 1957 (2 Bde., Text u. Taf.). 390 S., 243 Taf. Fritz Saxl, a volume of memorial essays from his friends in England. Edited by D. J. Gordon. Edinburgh, Thomas Nelson and Sons Ltd., 1957. 369 S., 39 Taf.
description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Bd. 13 Nr. 3 (1960): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Flavoured Large N Gauge Theory on a Compact Space with an External Magnetic Field
Creators: name: Filev, Veselin G.
name: Ihl, Matthias
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The phase structure of flavoured N=2 SYM on a three sphere in an external magnetic field is studied. The pairing effect of the magnetic field competes with the dissociating effect of the Casimir free energy, leading to an interesting phase structure of confined and deconfined phases separated by a critical curve of a first order quantum phase transition. At vanishing magnetic field the phase transition is of a third order. For sufficiently strong magnetic field, the only stable phase is the confined phase and magnetic catalysis of chiral symmetry breaking is realized. The meson spectra of the theory exhibit Zeeman splitting and level crossing and feature a finite jump at the phase transition between the confined and deconfined phases. At strong magnetic field the ground state has a massless mode corresponding to the Goldstone boson associated with the spontaneously broken U(1) R-symmetry analogous to the eta' meson in QCD.
description: 1+28 pages, 16 figures, v3: minor corrections, a problem with the original ansatz addressed, some typos corrected, references added
Détection De Tumeurs Par Tomographie Optique Diffuse Et De Fluorescence Résolue En Temps.
Creators: name: Dollé, Guillaume
name: Belhachmi, Zakaria
name: Prud'homme, Christophe
name: Torregrossa, Murielle
Publisher: name: Zenodo
Year: 2015
Subjects: Tomography, Optical, Diffuse, Fluorescence, Feel++, Non-contact

description: Présentation réalisé lors de la "4ième journée modélisation et calcul" au laboratoire de mathématiques - EA 4535.

"Nous nous intéressons à une nouvelle approche optique pour la détection de tumeurs qui se base sur une source lumineuse située dans le proche infrarouge. Il s'agit ici de reconstruire les cartes des propriétés optiques et de fluorescence d'un millieu considéré (objet, petit animal) à partir de mesures au bord fournies par un appareil expérimental développé par l'équipe IMIS (ICube). Dans cet exposé, j'évoquerai le problème inverse lié à la reconstruction d'image. On s'intéressera plus particulièrement au problème direct du phénomène de diffusion et de fluorescence ainsi qu'aux contraintes expérimentales qui s'appliquent à notre modèle numérique."
description: (Site web de la journée:  http://salmon.perso.math.cnrs.fr/modcalc4/)
On the redundancy of birth and death rates in homogenous epidemic SIR models
Creators: name: Nill, Florian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Dynamical Systems (math.DS)
subject: FOS: Biological sciences
subject: FOS: Mathematics
subject: 34C23, 34C26, 37C25, 92D30

description: The dynamics of fractional population sizes y_i=Y_i/N in homogeneous compartment models with time dependent total population N is analyzed. Assuming constant per capita birth and death rates the vector field Y_i'=V_i(Y) naturally projects to a vector field F_i(Y) tangent to the leaves of constant population N. A universal formula for the projected field F_i is given. In this way, in many SIR-type models with standard incidence all demographic parameters become redundant for the dynamical system y_i'=F_i(y). They may be put to zero by shifting remaining parameters appropriately. Normalizing eight examples from the literature this way, they unexpectedly become isomorphic for corresponding parameter ranges. Thus, some recently published results turn out to be already covered by papers 20 years ago.
description: 9 pages, 3 figures, 2 tables. arXiv admin note: text overlap with arXiv:2301.00159
Bagge, Axel und Kaelas, Lili: Die Funde aus Dolmen und Ganggräbern in Schonen, Schweden. Bd. I. Das Härad Villand
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Bagge, Axel und Kaelas, Lili: Die Funde aus Dolmen und Ganggräbern in Schonen, Schweden. Bd. I. Das Härad Villand. Stockholm (Kungl. Vitterhets Historie och Antikvitets Akademien) 1950. 168 Seiten mit 61 Abb. im Text und 82 Lichtdrucktafeln. S. Kr. 40.—. Bd. II. Die Härade Gärds, Albo, Järrestad, Ingelstad, Heerestad, Ljunits. Stockholm 1952. 106 Seiten mit 82 Abb. im Text und 44 Lichtdrucktaf.
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 23 (1954): Nachrichten aus Niedersachsens Urgeschichte
Fast compression of a cold atomic cloud using a blue detuned crossed dipole trap
Creators: name: Bienaime, Tom
name: Barontini, Giovanni
name: de Lepinay, Laure Mercier
name: Bellando, Louis
name: Chabe, Julien
name: Kaiser, Robin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We present the experimental realization of a compressible blue detuned crossed dipole trap for cold atoms allowing for fast dynamical compression (~ 5 - 10 ms) of 5x10^7 Rubidium atoms up to densities of ~ 10^13 cm^-3. The dipole trap consists of two intersecting tubes of blue-detuned laser light. These tubes are formed using a single, rapidly rotating laser beam which, for sufficiently fast rotation frequencies, can be accurately described by a quasi-static potential. The atomic cloud is compressed by dynamically reducing the trap volume leading to densities close to the Ioffe-Reggel criterion for light localization.
description: 14 pages, 15 figures, 2 tables
title: Transaction cost theory refined
title: theoretical and empirical evidence from a business-to-business marketing perspective
titleType: Subtitle
Creators: name: Ungruhe, Markus
name: Kreis, Henning
name: Kleinaltenkamp, Michael
Publisher: name: Freie Universität Berlin
Year: 2010
Subjects: subject: new institutional economics
subject: risk
subject: uncertainty
subject: asset specificity
subject: 600 Technik, Medizin, angewandte Wissenschaften::650 Management, Öffentlichkeitsarbeit

description: Recently, integrating Transaction Cost Economic (TCE) and Resource Based View (RBV) arguments has become one of the most prominent theoretical approaches in research on business relationships. We question this dominance and strengthen an exclusive TCE perspective by recalling two of the core TCE constructs in order to achieve full exploitation of TCE reasoning. We discuss the transaction attributes “asset specificity” and “uncertainty” and identify conceptual gaps that lead to ambiguous results regarding the test of TCE guided hypotheses in prior relationship marketing and management research. To overcome these problems, we redefine both concepts and show that they are interconnected in more complex ways than past empirical research has accounted for. Hypotheses are derived and tested empirically in a cross-sectional online-survey setting by using means of structural equation modelling.
Haarnagel, Werner: Probleme der Küstenforschung im Gebiet der südlichen Nordsee. Band 5.
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Haarnagel, Werner: Probleme der Küstenforschung im Gebiet der südlichen Nordsee. Band 5. (= Bd. XIV der Veröffentlichungen der urgeschichtlichen Sammlungen des Landesmuseums zu Hannover) Hildesheim (August Lax) 1953. 43 Seiten mit 42 Abb. im Text, auf 12 Kunstdruck- und 2 Falttaf.
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 23 (1954): Nachrichten aus Niedersachsens Urgeschichte
Adaptive Massively Parallel Connectivity in Optimal Space
Creators: name: Latypov, Rustam
name: Łącki, Jakub
name: Maus, Yannic
name: Uitto, Jara
Publisher: name: arXiv
Year: 2023
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: We study the problem of finding connected components in the Adaptive Massively Parallel Computation (AMPC) model. We show that when we require the total space to be linear in the size of the input graph the problem can be solved in $O(\log^* n)$ rounds in forests (with high probability) and $2^{O(\log^* n)}$ expected rounds in general graphs. This improves upon an existing $O(\log \log_{m/n} n)$ round algorithm. For the case when the desired number of rounds is constant we show that both problems can be solved using $Θ(m + n \log^{(k)} n)$ total space in expectation (in each round), where $k$ is an arbitrarily large constant and $\log^{(k)}$ is the $k$-th iterate of the $\log_2$ function. This improves upon existing algorithms requiring $Ω(m + n \log n)$ total space.
description: ACM Symposium on Parallelism in Algorithms and Architectures (SPAA) 2023
A transfer mechanism for a monetary union
Creators: name: Engler, Philipp
name: Voigts, Simon
Publisher: name: Freie Universität Berlin
Year: 2013
Subjects: subject: Monetary Union
subject: Asymmetric Shocks
subject: Fiscal Policy
subject: Fiscal Transfers
subject: 300 Sozialwissenschaften::330 Wirtschaft
subject: 300 Sozialwissenschaften::330 Wirtschaft::337 Weltwirtschaft

description: We show in a dynamic stochastic general equilibrium framework that the introduction of a common currency by a group of countries with only partially integrated goods markets, incomplete financial markets and no labor migration across member states, signi cantly increases volatility of consumption and employment in the face of asymmetric shocks. We propose a simple transfer mechanism between member countries of the union that reduces this volatility. Furthermore, we show that this mechanism is more efficient than anticyclical policies at the national level in terms of a better stabilization for the same budgetary effects for households while in the long run deeper integration of goods markets could reduce volatility signi cantly. Regarding its implementation, we show that the centralized provision of public goods and services at the level of the monetary union implies cross-country transfers comparable to the scheme under study.
On Optimal TCM Encoders
Creators: name: Alvarado, Alex
name: Amat, Alexandre Graell i
name: Brannstrom, Fredrik
name: Agrell, Erik
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: An asymptotically optimal trellis-coded modulation (TCM) encoder requires the joint design of the encoder and the binary labeling of the constellation. Since analytical approaches are unknown, the only available solution is to perform an exhaustive search over the encoder and the labeling. For large constellation sizes and/or many encoder states, however, an exhaustive search is unfeasible. Traditional TCM designs overcome this problem by using a labeling that follows the set-partitioning principle and by performing an exhaustive search over the encoders. In this paper we study binary labelings for TCM and show how they can be grouped into classes, which considerably reduces the search space in a joint design. For 8-ary constellations, the number of different binary labelings that must be tested is reduced from 8!=40320 to 240. For the particular case of an 8-ary pulse amplitude modulation constellation, this number is further reduced to 120 and for 8-ary phase shift keying to only 30. An algorithm to generate one labeling in each class is also introduced. Asymptotically optimal TCM encoders are tabulated which are up to 0.3 dB better than the previously best known encoders.
title: Krieg als Hobby? Das Leipziger Völkerschlacht-Reenactment und der Versuch einer Entgegnung.
Creators: name: Haude, Bertram
Publisher: name: datalino
Year: 2015

description: Every year in October re-enactors march through Leipzig to replay the so-called Völkerschlacht in 1813 to the cheers of the bystanders. The 200th anniversary of the Völkerschlacht attracted a particularly large public. The artist Bertram Haude responded to this mass event with the foundation of an „International Shattered Liberation Force“ (ISLF), a group of anti-re-enactors who disturbed the picturesque image of a war turned festival. The ISLF made an appearance as ill-treated, injured and demoralized losers of the war. The experience resulted in a critical discussion of re-enactment. The essay aims to question the role of cultures of remembrance in general.
description: Im Oktober marschieren alljährlich in Leipzig Reenactors auf, um unter dem Jubel der ZuschauerInnen die sogenannte Völkerschlacht von 1813 nachzustellen. Als das 200-jährige „Jubiläum“ der Völkerschlacht ein in die Tausende reichendes Publikum anzog, entgegnete der Künstler Bertram Haude diesem Massenevent mit der Gründung der “International Shattered Liberation Force” (ISLF), einer Gruppe von Gegen-Reenactors, die mit ihrem Auftreten als geschundene, verwundete und zermürbte Kriegsverlierer das einseitig glanzvolle Bild eines festlichen Krieges zu stören versuchte. Daraus resultiert eine kritische Auseinandersetzung mit dem Phänomen Reenactment. Der streitbare Essay soll dazu anregen, über die Rolle der Erinnerungskultur insgesamt nachzudenken.
Nondiffracting Accelerating Waves: Weber waves and parabolic momentum
Creators: name: Bandres, Miguel A.
name: Rodríguez-Lara, B. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Mathematical Physics (math-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Diffraction is one of the universal phenomena of physics, and a way to overcome it has always represented a challenge for physicists. In order to control diffraction, the study of structured waves has become decisive. Here, we present a specific class of nondiffracting spatially accelerating solutions of the Maxwell equations: the Weber waves. These nonparaxial waves propagate along parabolic trajectories while approximately preserving their shape. They are expressed in an analytic closed form and naturally separate in forward and backward propagation. We show that the Weber waves are self-healing, can form periodic breather waves and have a well-defined conserved quantity: the parabolic momentum. We find that our Weber waves for moderate to large values of the parabolic momenta can be described by a modulated Airy function. Because the Weber waves are exact time-harmonic solutions of the wave equation, they have implications for many linear wave systems in nature, ranging from acoustic, electromagnetic and elastic waves to surface waves in fluids and membranes.
description: 10 pages, 4 figures, v2: minor typos corrected
Metaphern, Begriffe und Bedeutungen – das Beispiel internationale monetäre Institutionen
Creators: name: Muchlinski, Elke
Publisher: name: Freie Universität Berlin
Year: 2010
Subjects: subject: 300 Sozialwissenschaften::330 Wirtschaft::339 Makroökonomie und verwandte Themen

description: Das Ziel des Forschungsvorhabens besteht zum einen darin, die Bedeutungskonstitution zu untersuchen. Zum anderen soll gezeigt werden, dass nationale und internationale monetäre Institutionen in ihren Kommunikationsformen nicht einem linear-kausalen Kommunikationsmodell folgen. Der neue methodische Ansatz versteht sich komplementär zu den formal analytischen Begriffskonstruktionen. Ökonomie als Erfahrungswissenschaft bedarf eines vielfältigen Methodenrepertoires. Die Unabdingbarkeit der Methodenvielfalt resultiert aus dem Mandat der Preisstabilität der Zentralbanken, das sie im Kontext von Unsicherheit über die Steuerung der Erwartungen der Finanzmarktakteure zu erfüllen versuchen. Die Erwartungssteuerung gelingt nicht als lineare Projektion gegebener Erwartungen oder Bedeutungen. Sie gelingt über die Sprachvermitteltheit, die Verwendung von Metaphern und Begriffen in ökonomischen Interaktionen. Bedeutungen sind nicht ex ante gegeben. Der innovative Ansatz soll anhand der Entwicklung der Amerikanischen und Europäischen Zentralbank sowie der Bank für Internationalen Zahlungsausgleich weiterentwickelt und überprüft werden. Das Projekt verbindet den Forschungsstand zu monetären Institutionen mit der Wissenschaftstheorie und Analytischen Philosophie.
Design principles and fundamental trade-offs in biomimetic light harvesting
Creators: name: Sarovar, Mohan
name: Whaley, K. Birgitta
Publisher: name: arXiv
Year: 2012
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recent developments in synthetic and supramolecular chemistry have created opportunities to design organic systems with tailored nanoscale structure for various technological applications. A key application area is the capture of light energy and its conversion into electrochemical or chemical forms for photovoltaic or sensing applications. In this work we consider cylindrical assemblies of chromophores that model structures produced by several supramolecular techniques. Our study is especially guided by the versatile structures produced by virus-templated assembly. We use a multi-objective optimization framework to determine design principles and limitations in light harvesting performance for such assemblies, both in the presence and absence of disorder. We identify a fundamental trade-off in cylindrical assemblies that is encountered when attempting to maximize both efficiency of energy transfer and absorption bandwidth. We also rationalize the optimal design strategies and provide explanations for why various structures provide optimal performance. Most importantly, we find that the optimal design strategies depend on the amount of energetic and structural disorder in the system. The aim of these studies is to develop a program of quantum-informed rational design for construction of organic assemblies that have the same degree of tailored nanoscale structure as biological photosynthetic light harvesting complexes, and also have the potential to reproduce their remarkable light harvesting performance.
description: 35 pages, 8 figures. Published version
Paulsen, Peter: Schwertortbänder der Wikingerzeit
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Paulsen, Peter: Schwertortbänder der Wikingerzeit. Ein Beitrag zur Frühgeschichte Osteuropas. Stuttgart (W.-Kohlhammer-Verlag) 1953. 196 Seiten mit 250 Abb. u. 17 Fundkarten
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 23 (1954): Nachrichten aus Niedersachsens Urgeschichte
Schulz, Walter: Leuna, ein germanischer Bestattungsplatz der spätrömischen Kaiserzeit
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Schulz, Walter: Leuna, ein germanischer Bestattungsplatz der spätrömischen Kaiserzeit. Mit Beiträgen von H. Grimm (Anthropologie), O. F. Gandert (Säugetiere u. Vögel) u. H. H. Wundsch (Fische). Band 1 der Schriften der Sektion für Vor- und Frühgeschichte in der deutschen Akademie der Wissenschaften zu Berlin. Berlin (Akademie-Verlag) 1953. 96 Seiten mit 41 Taf. u. 97 Abb. im Text
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 23 (1954): Nachrichten aus Niedersachsens Urgeschichte
Wilde, Karl August: Die Bedeutung der Grabung Wollin 1934
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Wilde, Karl August: Die Bedeutung der Grabung Wollin 1934. 1. Beiheft zum Atlas der Urgeschichte. Herausgegeben von H. J. Eggers. 2. Aufl. Hamburg (Hamburgisches Museum für Völkerkunde und Vorgeschichte) 1953. 98 Seiten. Mit 1 Taf. im Text und V Taf. im Anhang
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 23 (1954): Nachrichten aus Niedersachsens Urgeschichte
Editorial
Creators: name: Redaktion, Die
Publisher: name: Regards croisés : Deutsch-französische Zeitschrift für Kunstgeschichte, Literaturwissenschaft & Ästhetik
Year: 2023

description: Regards croisés : Deutsch-französische Zeitschrift für Kunstgeschichte, Literaturwissenschaft & Ästhetik, Bd. 1 (2013): Regards croisés : Daniel Arasse
title: Religious identity, public goods and centralization
title: evidence from Russian and Israeli Cities
titleType: Subtitle
Creators: name: Grigoriadis, Theocharis
name: Torgler, Benno
Publisher: name: Freie Universität Berlin
Year: 2013
Subjects: subject: Religious identity
subject: public goods
subject: collectivism
subject: individualism
subject: local government
subject: centralization
subject: Russia
subject: Israel
subject: 300 Sozialwissenschaften::330 Wirtschaft
subject: 300 Sozialwissenschaften::330 Wirtschaft::336 Öffentliche Finanzen

description: In this paper, we analyze the effects of religious identity – defined both as personal identification with a religious tradition and institutional ideas on the provision of public goods – on attitudes toward central government. We explore whether citizens belonging to collectivist rather than individualist religious denominations are more likely to evaluate their central government positively. Moreover, we explore whether adherence to collectivist norms of economic and political organization leads to a positive evaluation of central government. Surveys were conducted in Russia and Israel as these countries provide a mosaic of three major world religions – Judaism, Eastern Orthodoxy and Sunni Islam. The information gathered also allows us to study whether attitudes towards religious institutions such as the Russian Orthodox Church, the Chief Rabbinate in Jerusalem, the Jerusalem Islamic Waqf, and the Greek- Orthodox Patriarchate of Jerusalem in Israel are able to predict positive attitudes toward centralized forms of governance. We find strong support for the proposition that collectivist norms and an institutional religious identity enhance positive attitudes towards central government.
Uncovering the Structural Evolution Arsenene on SiC Substrate
Creators: name: Okazaki, A. K.
name: de Oliveira, R. Furlan
name: Freire, R. L. H.
name: Fazzio, A.
name: de Lima, F. Crasto
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Two-dimensional arsenic allotropes have been grown on metallic surfaces, while topological properties have been theoretically described on strained structures. Here we experimentally grow arsenene by molecular beam epitaxy over the insulating SiC substrate. The arsenene presents a flat structure with a strain field that follows the SiC surface periodicity. Our ab initio simulations, based on the density functional theory, corroborate the experimental observation. The strained structure presents a new arsenene allotrope with a triangular structure, rather than the honeycomb previously predicted for other pnictogens. This strained structure presents a Peierls-like transition leading to an indirect gap semiconducting behavior.