cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Estimates for Lorentz factors of gamma-ray bursts from early optical afterglow observations
Creators: name: Hascoet, R.
name: Beloborodov, A. M.
name: Daigne, F.
name: Mochkovitch, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The peak time of optical afterglow may be used as a proxy to constrain the Lorentz factor Gamma of the gamma-ray burst (GRB) ejecta. We revisit this method by including bursts with optical observations that started when the afterglow flux was already decaying; these bursts can provide useful lower limits on Gamma. Combining all analyzed bursts in our sample, we find that the previously reported correlation between Gamma and the burst luminosity L_gamma does not hold. However, the data clearly shows a lower bound Gamma_min which increases with L_gamma. We suggest an explanation for this feature: explosions with large jet luminosities and Gamma < Gamma_min suffer strong adiabatic cooling before their radiation is released at the photosphere; they produce weak bursts, barely detectable with present instruments. To test this explanation we examine the effect of adiabatic cooling on the GRB location in the L_gamma - Gamma plane using a Monte Carlo simulation of the GRB population. Our results predict detectable on-axis "orphan" afterglows. We also derive upper limits on the density of the ambient medium that decelerates the explosion ejecta. We find that the density in many cases is smaller than expected for stellar winds from normal Wolf-Rayet progenitors. The burst progenitors may be peculiar massive stars with weaker winds or there might exist a mechanism that reduces the stellar wind a few years before the explosion.
description: 24 pages, 7 figures, 2 tables, accepted for publication in ApJ
A Behavioural Foundation for Natural Computing and a Programmability Test
Creators: name: Zenil, Hector
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: Artificial Intelligence (cs.AI)
subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences

description: What does it mean to claim that a physical or natural system computes? One answer, endorsed here, is that computing is about programming a system to behave in different ways. This paper offers an account of what it means for a physical system to compute based on this notion. It proposes a behavioural characterisation of computing in terms of a measure of programmability, which reflects a system's ability to react to external stimuli. The proposed measure of programmability is useful for classifying computers in terms of the apparent algorithmic complexity of their evolution in time. I make some specific proposals in this connection and discuss this approach in the context of other behavioural approaches, notably Turing's test of machine intelligence. I also anticipate possible objections and consider the applicability of these proposals to the task of relating abstract computation to nature-like computation.
description: 37 pages, 4 figures. Based on an invited Talk at the Symposium on Natural/Unconventional Computing and its Philosophical Significance, Alan Turing World Congress 2012, Birmingham, UK. http://link.springer.com/article/10.1007/s13347-012-0095-2 Ref. glitch fixed in 2nd. version; Philosophy & Technology (special issue on History and Philosophy of Computing), Springer, 2013
Removal of phosphorus from anaerobic digested blackwater by precipitation with struvite from seawater and magnesium chloride
Creators: name: Chaula, Emanuel Kapela
Publisher: name: Zenodo
Year: 2019

description: Phosphorus is a finite resource with the largest remaining resources in West Sahara and China. India and Europe have no significant mineral Phosphorus. The increase of awareness about the recovery of Phosphorus as fertilizer is an important issue for the food security and environmental protection. In this thesis the recovery of Phosphorus was carried out by precipitating anaerobic digested blackwater with Magnesium Chloride (MgCl2.6H2O) and Seawater. The main purpose was to determine the effect of mixing ratio and pH on the removal of nutrients from blackwater. Based on the main goal two hypothesis were formulated, firstly addition of Mg source is an important factor on the removal efficiency of P. The use of ratio of struvite Mg :P 1.3:1 and 1:1 led to about 90% and 80 of P removal respectively. And Secondary hypothesis was that an increase of pH from 8.5 to pH 9 increase removal efficiency. To carry out the experiment digested blackwater was taken from Realtek laboratory and source of seawater was taken from Drøbak. The adjustment of pH was done by adding few drops of Sodium hydroxide. Analysis of nutrients was done by using LCK 350 and LCK303 methods and the reading was taken from using Hach Lange 3900DR. The results showed the highest total P removal of 99.7% with MgCl2 at pH 9 and Mg:P of 1.3:1 with MgCl2 and 96.3% with seawater. Also, removal of PO4-P removal efficiency was 99% at seawater with mixing ratio of 1:1 at pH 9 and the lowest value was 95.1% with MgCl2 at pH 8.5 mixing ratio 1:1.
title: Μελέτη συνεπεξεργαστών για κβαντικούς υπολογιστές με χρήση αναδιατασσόμενης λογικής
Creators: name: Ζαμπετάκης Μιχαήλ
Publisher: name: Technical University of Crete
Year: 2008

description: Μη διαθέσιμο
title: Modelling water availability and water allocation strategies in the Scheldt basin: sub report 2. Development of a methodology for updating the water demand of the water allocation model
Creators: name: Huysentruyt, S.
name: Michielsen, Stef
name: Nossent, Jiri
name: Pereira, Fernando
name: Mostaert, Frank
Publisher: name: Flanders Hydraulics Research
Year: 2021

description: To be able to perform up to date simulations with the water allocation model of the Flemish navigable waterways, it is necessary to update its input regularly. Besides updating the network and possible new structures like new canal reaches, new locks, new pumping regimes, … also the water demand of the different water users should be updated. In contrary to the update of the network – which needs to be done manually – the update of the water demand can be done automatically by means of a new developed tool. This sub report describes the development of this tool.
description: Title : FHR reports. Flanders Hydraulics Research: Antwerp Volume : 00_162_2 Issue : Pagination : VIII, 35
title: Χρήση νευρωνικών δικτύων για την πρόβλεψη της ενεργειακής κατάταξης σε κτίρια γραφείων
Creators: name: Κιτσάκης Λάζαρος
Publisher: name: Technical University of Crete
Year: 2008

description: Μη διαθέσιμο
Pressure induced topological quantum phase transition in Sb_2Se_3
Creators: name: Li, Wei
name: Wei, Xin-Yuan
name: Zhu, Jian-Xin
name: Ting, C. S.
name: Chen, Yan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Based on the first-principles band structure calculations, we investigate the effects of hydrostatic pressure on the conventional insulator (CI) Sb_2Se_3 and predict that it undergoes a topological quantum phase transition from a CI to a nontrivial topological insulator at a critical pressure value. The pressure-induced topological quantum phase transition is confirmed by calculating the evolution of the bulk energy gap as a function of pressure, the inversion of energy band structure, and the Z_2 topological invariant, as well as the existence of the Dirac-like topological surface states. Our predictions can be tested by both spectroscopy and transport experiments.
description: 5 pages, 4 figures, 1 table
title: Ανάλυση ηλεκροεγκεφαλογραφήματος με τη χρήση θεωρίας κοινών παραγόντων
Creators: name: Σταυρίδης Κώστας
Publisher: name: Technical University of Crete
Year: 2008

description: Μη διαθέσιμο
Observables of a test-mass along an inclined orbit in a post-Newtonian approximated Kerr spacetime to leading-order-quadratic-in-spin
Creators: name: Hergt, Steven
name: Shah, Abhay
name: Schäfer, Gerhard
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The orbital motion is derived for a non-spinning test-mass in the relativistic, gravitational field of a rotationally deformed body not restricted to the equatorial plane or spherical orbit. The gravitational field of the central body is represented by the Kerr metric, expanded to second post-Newtonian order including the linear and quadratic spin terms. The orbital period, the intrinsic periastron advance, and the precession of the orbital plane are derived with the aid of novel canonical variables and action-based methods.
description: 4 pages, accepted version in Physical Review Letters (PRL)
title: Συνδυασμός ταξινομητών χρησιμοποιώντας μήτρες αποφάσεων (decision templates) με εφαρμογή στην ταξινόμηση καρκινικών δεδομένων
Creators: name: Δουγαλή Ευαγγελία
Publisher: name: Technical University of Crete
Year: 2008

description: Μη διαθέσιμο
On an intrinsic approach of the guiding-center anholonomy and gyro-gauge-arbitrariness
Creators: name: De Guillebon, Loïc
name: Vittot, Michel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: In guiding center theory, the standard gyro-angle coordinate is associated with gyro-gauge dependence, the global existence problem for unit vectors perpendicular to the magnetic field, and the notion of anholonomy, which is the failure of the gyro-angle to return to its original value after being transported around a loop in configuration space. We analyse these three intriguing topics through the lens of a recently proposed, global, gauge-independent gyro-angle. This coordinate is constrained, and therefore necessitates the use of a covariant derivative. It also highlights the intrinsic meaning and physical content of gyro-gauge freedom and anholonomy. There are, in fact, many possible covariant derivatives compatible with the intrinsic gyro-angle, and each possibility corresponds to a different notion of gyro-angle transport. This observation sheds new light on Littlejohn's notion of gyro-angle transport and suggests a new derivation of the recently-discovered global existence condition for unit vectors perpendicular to the magnetic field. We also discuss the relationship between Cartesian position-momentum coordinates and the intrinsic gyro-angle.
title: Δημιουργία συστήματος διαχείρισης έξυπνων κτηρίων με τη χρήση του πρωτοκόλλου XMPP
Creators: name: Λογιωτατίδης Γιώργος
Publisher: name: Technical University of Crete
Year: 2008

description: Μη διαθέσιμο
Probing phase-space noncommutativity through quantum beating, missing information and the thermodynamic limit
Creators: name: Bernardini, Alex E.
name: Bertolami, O.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this work we examine the effect of phase-space noncommutativity on some typically quantum properties such as quantum beating, quantum information, and decoherence. To exemplify these issues we consider the two-dimensional noncommutative quantum harmonic oscillator whose components behavior we monitor in time. This procedure allows us to determine how the noncommutative parameters are related to the missing information quantified by the linear quantum entropy and by the mutual information between the relevant Hilbert space coordinates. Particular questions concerning the thermodynamic limit of some relevant properties are also discussed in order to evidence the effects of noncommutativity. Finally, through an analogy with the Zeeman effect, we identify how some aspects of the axial symmetry of the problem suggest the possibility of decoupling the noncommutative quantum perturbations from unperturbed commutative well-known solutions.
description: 34 pages, 8 figures
title: Βελτιστοποίηση σχεδιασμού και αξιολόγηση συστήματος φωτοβολταϊκών στοιχείων για την παραγωγή ενέργειας σε ηλεκτρικά δίκτυα
Creators: name: Κορνελάκης Άρης
Publisher: name: Technical University of Crete
Year: 2008

description: Μη διαθέσιμο
title: Εγκαταλελειμμένες σιδηροδρομικές γραμμές ως κατάλοιπα τοπίου: "Η επανάχρησή τους στον αστικό ιστό"
Creators: name: Σφηκας Αλεξιος
Publisher: name: Technical University of Crete
Year: 2018

description: Η παρούσα ερευνητική εργασία επιχειρεί να παρουσιάσει παραδείγματα επανάχρησης εγκαταλελειμμένων σιδηροδρομικών γραμμών που βρίσκονται εντός αστικού ιστού υπό το πρίσμα της αρχιτεκτονικής τοπίου.

Στο πρώτο μέρος της εργασίας παρουσιάζεται το πώς άλλαξε η αντίληψη του όρου  “τοπίο” στο πέρασμα των χρόνων μέσα από διάφορες μελέτες αρχιτεκτόνων και όχι μόνο. Στη συνέχεια μελετάται συνοπτικά η προσέγγιση του James Corner, η συμβολή του οποίου ήταν σημαντική για την αλλαγή αυτή.

Στο δεύτερο μέρος, παρουσιάζονται τα εξής 4 παραδείγματα: το “The Promenade Plantee” του Παρισιού, το “The Beltline” της Ατλάντα, το “The High Line” της Νέας Υόρκης και το “The Goods Line” του Σύδνεϋ. Μελετούνται ως προς την αρχική τους χρήση, τον τρόπο που αντιμετωπίστηκαν από τη κοινωνία κατά την εγκατάλειψή τους και τον τρόπο που επανασχεδιάστηκαν από τους αρχιτέκτονες. Τέλος αναπτύσσεται μια σειρά συμπερασμάτων ως προς τον τρόπο που αντιμετωπίστηκε συνθετικά η κάθε περίπτωση υπό τις εκάστοτε συνθήκες και γίνεται μια σύγκριση μεταξύ αυτών και κριτική τοποθέτηση με στόχο να διατυπωθούν συνθετικές αρχές και κριτήρια σχεδιασμού.
Physics behind the minimum of relative entropy measures for correlations
Creators: name: Held, K.
name: Mauser, N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The relative entropy of a correlated state and an uncorrelated reference state is a reasonable measure for the degree of correlations. A key question is however which uncorrelated state to compare to. The relative entropy becomes minimal for the uncorrelated reference state that has the same one-particle density matrix as the correlated state. Hence, this particular measure, coined nonfreeness, is unique and reasonable. We demonstrate that for relevant physical situations, such as finite temperatures or a correlation enhanced orbital splitting, other choices of the uncorrelated state, even educated guesses, overestimate correlations.
description: 4 pages, 1 figure, final version as to appear European Physical Journal B
title: Η διαπραγμάτευση του εδάφους στη σύγχρονη αρχιτεκτονική (από το διεθνές παράδειγμα στον Ελλαδικό χώρο)
Creators: name: Ζωτου Σοφια
name: Παπακωνσταντινου-Μπρατη Ιωαννα
Publisher: name: Technical University of Crete
Year: 2017

description: Το έδαφος αποτελεί κύριο συστατικό στοιχείο της φύσης, στο οποίο αναπτύσσονται οι ανθρώπινες δραστηριότητες, και επακόλουθα η ίδια η αρχιτεκτονική. Άλλοτε γίνεται φορέας πάνω στον οποίο ορθώνονται και αναδεικνύονται οι ανθρώπινες δημιουργίες, και άλλοτε μετατρέπεται σε μεμβράνη που διαφυλάσσει κρυμμένα τα στοιχεία του. H παρούσα έρευνα, με αναφορά στο σχέδιο της τομής, επιχειρεί να αναζητήσει τον διάλογο που αναπτύσσεται μεταξύ αρχιτεκτονικής και εδάφους στην σύγχρονη συνθήκη, τόσο στο διεθνές παράδειγμα όσο και στο ελληνικό. Προκειμένου να διερευνηθεί ο ρόλος του εδάφους στην αρχιτεκτονική πρακτική, κρίνεται σκόπιμη η μελέτη του από την στιγμή που το Μοντέρνο Κίνημα κηρύσσει την απελευθέρωσή των αρχιτεκτονημάτων από αυτό, μέχρι την σύγχρονη εποχή που συντελεί αυτόνομη αρχιτεκτονική συνθήκη. Διαφορετικές μέθοδοι διαχείρισης του εδάφους σε χαρακτηριστικά διεθνή παραδείγματα φανερώνουν ότι απασχολεί έντονα την αρχιτεκτονική σκέψη και εφαρμογή. Η σμίλευση του εδάφους ή οι συνεχείς του αναδιπλώσεις υποδεικνύουν το εύρος ερμηνειών που μπορεί να δεχθεί ως αρχιτεκτονικό εργαλείο, καθώς και τις χωρικές ποιότητες που δημιουργούν οι διαφορετικές του προσεγγίσεις. Περνώντας στον ελληνικό χώρο, αναζητείται το λεξιλόγιο που θα μεταφράσει τα διεθνή παραδείγματα στην εγχώρια εδαφική αρχιτεκτονική. Η αναγνώριση των προτύπων του Μοντέρνου Κινήματος στον ελλαδικό χώρο, εισάγει την έννοια του εδάφους στην προβληματική αρχιτεκτόνων. Η ελληνική εμπειρία από την δεκαετία του ‘60 συνομιλεί σε ορισμένες περιπτώσεις με την φύση και το έδαφος με ευρηματικούς τρόπους. Υπάρχει άραγε εδαφικά προσδιορισμένη αρχιτεκτονική στην Ελλάδα σήμερα?
Openness oder „nordkoreanische Verhältnisse“? Top-down implementierter Open Access im britischen Hochschulsystem
Creators: name: Koller, Christian
Publisher: name: Verein Informationspraxis
Year: 2017

description: Die britische Hochschulpolitik verfolgt seit 2011 eine ambitionierte Strategie des forcierten Übergangs zu Open Access. Die auf der Präferenz für den Goldenen Weg beruhende und top-down gesteuerte Implementierung dieser Strategie hat bei den Forschenden geteilte Aufnahme gefunden. Der Artikel analysiert Hintergründe und Kontexte der britischen Open-Access-Strategie sowie deren Auswirkungen auf die unterschiedlichen Stakeholders und zeigt auf, dass der britische Ansatz nicht nur mit beträchtlichem finanziellen und bürokratischen Aufwand verbunden ist, sondern tendenziell auch bestehende Ungleichheiten im Hochschulsystem wie auch der Verlagslandschaft zementiert und die zunehmende Einschränkung der akademischen Freiheit im managementgesteuerten britischen Hochschulsystem verstärkt.
description: Informationspraxis, Bd. 3, Nr. 1 (2017)
title: Σύγκριση συνθέσεων ποζολανικών κονιαμάτων υπό την επιλεκτική εφαρμογή νανο-τιτανίας και μελέτη συμπεριφοράς τους ως συνδετικό υλικό σε τυπικά πρίσματα τοιχοποιίας
Creators: name: Πατσουμαδακης Εμμανουηλ
name: Κατσιμπρας Κωνσταντινος
Publisher: name: Technical University of Crete
Year: 2018

description: Η παρούσα ερευνητική εργασία εκπονήθηκε στο Εργαστήριο Πολιτιστικής Κληρονομιάς & Σύγχρονης Δόμησης του Πολυτεχνείου Κρήτης, υπό την επιστημονική επιμέλεια της Αναπληρώτριας Καθηγήτριας της Σχολής Αρχιτεκτόνων Μηχανικών κα. Ν.Π. Μαραβελάκη. Στόχος της αποτελεί, η σύνθεση ποζολανικών ασβεστοκονιαμάτων με ή χωρίς την χρήση πρόσθετων νανο-υλικών και η εξαγωγή συμπερασμάτων όσον αφορά τις μηχανικές τους ιδιότητες, τη σύστασή τους και τη συμπεριφορά τους σε συνθήκες υγρασίας.

Αρχικά, πραγματοποιείται σύντομη ιστορική αναδρομή πάνω στη χρήση ασβεστοκονιαμάτων από την προϊστορική εποχή έως σήμερα, ενώ έπειτα γίνεται αναφορά στο τι είναι κονίαμα, σε ποιες κατηγορίες χωρίζεται και ποια είναι τα συνθετικά του μέρη. Εν συνεχεία, παρατίθενται ορισμένα παραδείγματα επεμβάσεων σε ιστορικά μνημεία με τη χρήση ασβεστοκονιαμάτων. Στο πειραματικό σκέλος της εργασίας, αφού πρώτα γίνεται μια αναφορά στα υλικά που χρησιμοποιήθηκαν, παρουσιάζεται η διαδικασία σύνθεσης των κονιαμάτων και έπειτα οι πειραματικές μελέτες πάνω σε αυτά (έλεγχος μηχανικών αντοχών, τριχοειδής αναρρίχηση, υπέρηχοι, τεχνητή γήρανση με τη χρήση αλάτων). Μετά την καταγραφή των αποτελεσμάτων, γίνεται σε δεύτερο στάδιο η ερμηνεία αυτών και διαπιστώνεται ότι όλες οι συνθέσεις των κονιαμάτων είχαν ικανοποιητικές μηχανικές αντοχές. Συγκρίνοντας τις συνθέσεις, συμπεραίνεται ότι η εφαρμογή νανοτιτανίας ως πρόσθετο δεν αυξάνει τις μηχανικές αντοχές των κονιαμάτων. Η σύνθεση που διαθέτει τις καλύτερες μηχανικές ιδιότητες και παρουσιάζει εξαιρετική συμπεριφορά στο πείραμα της τεχνητής γήρανσης με τη χρήση αλάτων, διατηρώντας τα δοκίμια αναλλοίωτα, είναι αυτή του MYN ( υδραυλική άσβεστος, μετακαολίνης, νταμαρίσια άμμος).

Επιπλέον, μελετάται και η συμπεριφορά των κονιαμάτων ως αρμός σε συστήματα τοιχοποιίας κεραμικών τούβλων  και τσιμεντότουβλων. Τα συστήματα έχουν ικανοποιητική συμπεριφορά, ενώ και τα κονιάματα μέσα σε αυτά παρουσιάζουν καλή συγγένεια με τα τοιχοσώματα συγκρατώντας τα αποτελεσματικά. Στη συνέχεια, πραγματοποιείται προσεγγιστική σύγκριση κόστους σύνθεσης των ποζολανικών κονιαμάτων με ένα τυπικό τσιμεντοκονίαμα.

Τέλος με βάση την έρευνα που πραγματοποιήθηκε κρίνεται ότι το κονίαμα MYN αποτελεί εξαιρετική λύση στον τομέα των υλικών για τη χρήση του τόσο σε επεμβάσεις αποκαταστάσεων σε υφιστάμενα κελύφη, όσο και σε μνημεία και αρχαιολογικούς χώρους.
Formulation of the Schwinger mechanism in classical statistical field theory
Creators: name: Gelis, F.
name: Tanji, N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this paper, we show how classical statistical field theory techniques can be used to efficiently perform the numerical evaluation of the non-perturbative Schwinger mechanism of particle production by quantum tunneling. In some approximation, we also consider the back-reaction of the produced particles on the external field, as well as the self-interactions of the produced particles.
description: 28 pages, 28 pdf figures; title changed, to appear in Phys.Rev.D
Beton und seine wachsende Rolle in der Denkmalpflege. Frühe Betonbauten in Baden-Württemberg: gestampft bis geschüttet
Creators: name: Buchenau, Geraldine
Publisher: name: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege
Year: 2017

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 46, Nr. 1 (2017)
Elisabeth Spitzbart/Jörg Schilling: Martin Elsaesser. Kirchenbauten, Pfarr- und Gemeindehäuser. Mit Neuaufnahmen von Rose Hajdu
Creators: name: Seemann, Eva
Publisher: name: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege
Year: 2017

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 46, Nr. 1 (2017)
Brightness Control in Dynamic Range Constrained Visible Light OFDM Systems
Creators: name: Yu, Z.
name: Baxley, R. J.
name: Zhou, G. T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Visible light communication (VLC) systems can provide illumination and communication simultaneously via light emitting diodes (LEDs). Orthogonal frequency division multiplexing (OFDM) waveforms transmitted in a VLC system will have high peak-to-average power ratios (PAPRs). Since the transmitting LED is dynamic-range limited, OFDM signal has to be scaled and biased to avoid nonlinear distortion. Brightness control is an essential feature for the illumination function. In this paper, we will analyze the performance of dynamic range constrained visible light OFDM systems with biasing adjustment and pulse width modulation (PWM) methods. We will investigate the trade-off between duty cycle and forward ratio of PWM and find the optimum forward ratio to maximize the achievable ergodic rates.
Spin-Orbit mediated spin relaxation in monolayer MoS2
Creators: name: Ochoa, H.
name: Roldán, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the intra-valley spin-orbit mediated spin relaxation in monolayers of MoS2 within a two bands effective Hamiltonian. The intrinsic spin splitting of the valence band as well as a Rashba-like coupling due to the breaking of the out-of-plane inversion symmetry are considered. We show that, in the hole doped regime, the out-of-plane spin relaxation is not very efficient since the spin splitting of the valence band tends to stabilize the spin polarization in this direction. We obtain spin lifetimes larger than nanoseconds, in agreement with recent valley polarization experiments.
description: final version, 9 pages, 5 figures
title: Splanzia: Habitation Intra Muros / προτάσεις καθημερινής ζωής στην Παλιά Πόλη Χανίων
Creators: name: Πεταση Δαναη
Publisher: name: Technical University of Crete
Year: 2018

description: Τα Χανιά, μια πόλη με μεγάλο ιστορικό και αρχιτεκτονικό ενδιαφέρον, αποτελούν σήμερα πόλο έλξης επισκεπτών, ωστόσο η υπέρμετρη τουριστική ανάπτυξη έχει παγιώσει στην πόλη σημαντικά προβλήματα. Η Παλιά Πόλη, το ιστορικό κέντρο, αντιμετωπίζεται ως ένα εμπόρευμα προς πώληση, όπου κάθε εκατοστό δίνεται για την ανάπτυξη τουριστικών, εμπορικών και ψυχαγωγικών επιχειρήσεων, και οι δημόσιοι χώροι είναι προϊόν υπό εξαφάνιση. Ταυτόχρονα, σε ολόκληρα τα Χανιά, το ζήτημα της κατοικίας έχει αναδειχθεί ως μείζον, αφού η βραχυχρόνια μίσθωση μέσω διαδικτύου έχει δημιούργησει τεράστιο πρόβλημα στους κατοίκους, μόνιμους και μη. Από τη άλλη πλευρά, έχουμε το φαινόμενο των κενών κτιρίων, αφού σήμερα η συντήρηση και η αποκάτασταση τους, ιδιαίτερα εντός
του ιστορικού κέντρου, είναι απαγορευτική για τους ιδιοκτήτες τους, οι οποίοι προτιμούν να τα αφήνουν ανεκμετάλλευτα. Έτσι δημιουργείται μια αντιφατική πραγματικότητα, όπου υπάρχει αυξημένη ζήτηση για στέγαση και ανεκμετάλλευτο κτιριακό απόθεμα. Σε αυτή τη διπλωματική, έχοντας όλα τα παραπάνω υπόψιν, επίλεγεται, ως περιοχή αστικών επεμβάσεων, το τμήμα της Παλιάς Πόλης, που παρουσίαζει το μεγαλύτερο βαθμό εγκατάλειψης και κενών κτιρίων, το βόρειο τμήμα της Σπλάντζιας. Ταυτόχρονα, όμως είναι μια περιοχή που εμπεριέχει σημαντικά στοιχεία της ζωής και της ιστορίας της πόλης, όπως η πλατεία της Σπλάντζιας, ενώ η εισχώρηση του νέου τμήματος της πόλης στα σημεία που είχαν πληγεί από τους βομβαρδισμούς, δημιουργεί προβληματικές αλλά και ενδιαφέρουσες σχέσεις. Οι επεμβάσεις έχουν ως στόχο, την ενίσχυση κυρίαρχα της χρήσης της κατοικίας, πιο συγκεκριμένα κοινωνικής, συνδυαστικά με τον πολιτισμό, τον περιορισμό της τουριστικής και εμπορικής εκμετάλλευσης και δημιουργία δικτύων διαδρομών και δημόσιων χώρων, μέσα από την επανάχρηση των κενών κτιρίων, την προσθήκη νέων κτιρίων και κατασκευών και την μετατροπή των αστικών κενών σε βιώσιμους δημόσιους χώρους. Επιπλέον, όλη η πρόταση στοχεύει στο να ενοποιήσει τα επιμέρους τμήματα της περιοχής, τα οποία έχουν αποσυνδεθεί λόγω αποσπασματικών αστικών παρεμβάσεων και να ενισχύσει τον χαρακτήρα της περιοχής ως μέρους του ιστορικού συνόλου της Παλιάς Πόλης.
Rank of divisors on hyperelliptic curves and graphs under specialization
Creators: name: Kawaguchi, Shu
name: Yamaki, Kazuhiko
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Let $(G, ω)$ be a hyperelliptic vertex-weighted graph of genus $g \geq 2$. We give a characterization of $(G, ω)$ for which there exists a smooth projective curve $X$ of genus $g$ over a complete discrete valuation field with reduction graph $(G, ω)$ such that the ranks of any divisors are preserved under specialization. We explain, for a given vertex-weighted graph $(G, ω)$ in general, how the existence of such $X$ relates the Riemann--Roch formulae for $X$ and $(G, ω)$, and also how the existence of such $X$ is related to a conjecture of Caporaso.
description: 34 pages. The proof of Theorem 1.13 has been significantly simplified
A New Approach To Two-View Motion Segmentation Using Global Dimension Minimization
Creators: name: Poling, Bryan
name: Lerman, Gilad
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We present a new approach to rigid-body motion segmentation from two views. We use a previously developed nonlinear embedding of two-view point correspondences into a 9-dimensional space and identify the different motions by segmenting lower-dimensional subspaces. In order to overcome nonuniform distributions along the subspaces, whose dimensions are unknown, we suggest the novel concept of global dimension and its minimization for clustering subspaces with some theoretical motivation. We propose a fast projected gradient algorithm for minimizing global dimension and thus segmenting motions from 2-views. We develop an outlier detection framework around the proposed method, and we present state-of-the-art results on outlier-free and outlier-corrupted two-view data for segmenting motion.
Peter Cornelius Bol (ed.), Die Geschichte der antiken Bildhauerkunst, Band III. Hellenistische Plastik
Creators: name: Schmidt-Dounas, Barbara
Publisher: name: Bonner Jahrbücher
Year: 2017

description: Rezension zu: Peter Cornelius Bol (ed.), Die Geschichte der antiken Bildhauerkunst, Band III. Hellenistische Plastik. in cooperation with Martin Flashar,Wilfred geominy, Ralf von den hoff, Ursula Mandel, Hans-Hoyer von Prittwitz und Gaffron, Ellen Schraudolph, and Christiane Vorster. With a contribution by Rudolf Känel. Publisher Philipp von Zabern, Mayence 2007. Text volume 452 pages with 138 illustrations, plates volume 440 pages with 932 illustrations
description: Bonner Jahrbücher, Bd. 208.2008(2010): Bonner Jahrbücher
Spin-orbit interactions in a helical Luttinger liquid with a Kondo impurity
Creators: name: Eriksson, Erik
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The combined effect of Rashba and Dresselhaus spin-orbit interactions on the physics of a helical Luttinger liquid coupled to a Kondo impurity is studied. A Rashba coupling can potentially destroy the Kondo singlet formation in certain parameter regimes [Phys. Rev. B 86, 161103(R) (2012)]. This effect is here shown to vanish for sufficiently strong Dresselhaus interaction. The transport properties of the system are investigated by calculating electrical conductance, current and current fluctuations, and thermal conductance.
description: 11 pages, 3 figures. Published version
Statistics of sums of correlated variables described by a matrix product ansatz
Creators: name: Angeletti, Florian
name: Bertin, Eric
name: Abry, Patrice
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We determine the asymptotic distribution of the sum of correlated variables described by a matrix product ansatz with finite matrices, considering variables with finite variances. In cases when the correlation length is finite, the law of large numbers is obeyed, and the rescaled sum converges to a Gaussian distribution. In constrast, when correlation extends over system size, we observe either a breaking of the law of large numbers, with the onset of giant fluctuations, or a generalization of the central limit theorem with a family of nonstandard limit distributions. The corresponding distributions are found as mixtures of delta functions for the generalized law of large numbers, and as mixtures of Gaussian distributions for the generalized central limit theorem. Connections with statistical physics models are emphasized.
description: 6 pages, 1 figure
Greywater treatment to drinking water : challenges and technologies
Creators: name: Rosario Klautau Araujo Gomes, Rodolfo
Publisher: name: Zenodo
Year: 2020
Subjects: Greywater
reuse
drinking water
challenges
technologies
treatment
organic micro-pollutants
pathogens
public perception

description: Water is a vital source to human health and well-being and an important engine in ecosystem services and a precondition for economic prosperity and sustainable development. However, water scarcity is becoming a rising concern around the world due to a blend of population growth, consumption patterns and socio-economic development. Wastewater reuse and reclamation offers interesting possibilities to overcome water scarcity. How to find solutions to achieve equilibrium between demand and supply intensify in the scenario of increasing pressures on water resources. The wastewater management systems and sustainable sanitation can soften demand from agriculture, freshwater supply, industry, energy generation and ecosystem replenishment by saving the insert of freshwater into the system and by providing the water fraction of wastewater available for environmental release and safe use. Decentralized source separation systems, that handle grey- and blackwater separately, are an attractive alternative due to the potential of water saving and resource recovery, where greywater reuse has the capacity to reduce the demand for new water. The main objective of this thesis is to investigate the challenges and prospects of using greywater as a source of drinking water and potential applications of decentralized greywater technologies to achieve drinking water quality. This thesis provides a literature review based on principles, facts and discussions regarding greywater characteristics and its challenges for reuse as well as an overview of potential technologies for decentralized greywater treatment. The study revealed that greywater represents one interesting alternative source of potable water due to the lower contamination than mixed wastewater. Furthermore, greywater can present challenges regarding organic micro-pollutants, pathogens, public perception when using greywater as a source of producing drinking water. There is a wide variation in greywater characteristics and volume generation rates which it is dependent on the, lifestyle patterns and type of settlement. The available technologies have been developed to treat or remove specific pollutants, but they do not offer alone full treatment of the greywater to drinking water. Filtration systems have the potential of integration with other systems to achieve potable water quality. Membrane processes are compact technologies for upgrading greywater pretreated from mechanical / biological / chemical process to drinking water. Public perception of greywater reuse is important to consider for implementation of adequate methods for a specific context.
title: Αναγνώριση ανθρωπίνων προσώπων και ενεργή παρακολούθηση με τα ρομποτικά τετράποδα AIBO
Creators: name: Μακαντάσης Κωνσταντίνος
Publisher: name: Technical University of Crete
Year: 2008

description: Μη διαθέσιμο
Alltag im Alten Rom. Das Landleben - Ein Lexikon von Karl-Wilhelm Weeber
Creators: name: Rabl, Josef
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Alltag im Alten Rom. Das Landleben - Ein Lexikon von Karl-Wilhelm Weeber, Artemis und Winkler Verlag Düsseldorf/Zürich 2000, 378 Seiten (ISBN 3-7608-1963-X).
description: Forum Classicum, Nr. 2 (2001): Forum Classicum
Non-Gaussian Mode Coupling and the Statistical Cosmological Principle
Creators: name: LoVerde, Marilena
name: Nelson, Elliot
name: Shandera, Sarah
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Local-type primordial non-Gaussianity couples statistics of the curvature perturbation ζon vastly different physical scales. Because of this coupling, statistics (i.e. the polyspectra) of ζin our Hubble volume may not be representative of those in the larger universe -- that is, they may be biased. The bias depends on the local background value of ζ, which includes contributions from all modes with wavelength k ~< H_0 and is therefore enhanced if the entire post-inflationary patch is large compared with our Hubble volume. We study the bias to locally-measured statistics for general local-type non-Gaussianity. We consider three examples in detail: (i) the usual fNL, gNL model, (ii) a strongly non-Gaussian model with ζ~ ζ_G^p, and (iii) two-field non-Gaussian initial conditions. In each scenario one may generate statistics in a Hubble-size patch that are weakly Gaussian and consistent with observations despite the fact that the statistics in the larger, post-inflationary patch look very different.
description: 34 pages, 8 Figures. references added, typos corrected; v3 matches JCAP version
Ausgegraben - Ausgewertet - Ausgestellt. Stadtmuseum Horb präsentiert wertvolle archäologische Funde aus dem frühmittel- alterlichen Gräberfeld von Horb-Altheim
Creators: name: Beilharz, Denise
Publisher: name: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege
Year: 2017

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 46, Nr. 1 (2017)
A chaotic image encryption scheme owning temp-value feedback
Creators: name: Zhang, Leo Yu
name: Hu, Xiaobo
name: Liu, Yuansheng
name: Wong, Kwok-Wo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: This paper presents a novel efficient chaotic image encryption scheme, in which the temp-value feedback mechanism is introduced to the permutation and diffusion procedures. Firstly, a simple trick is played to map the plain-image pixels to the initial condition of the Logistic map. Then, a pseudorandom number sequence (PRNS) is obtained from iterating the map. The permutation procedure is carried out by a permutation sequence which is generated by comparing the PRNS and its sorted version. The diffusion procedure is composed of two reversely executed rounds. During each round, the current plain-image pixel and the last cipher-image pixel are used to produce the current cipher-image pixel with the help of the Logistic map and a pseudorandom number generated by the Chen system. To enhance the efficiency, only expanded XOR operation and modulo 256 addition are employed during diffusion. Experimental results show that the new scheme owns a large key space and can resist the differential attack. It is also efficient.
description: 10 pages, 4 figures
Efficient Acceleration of Relativistic Magnetohydrodynamic Jets
Creators: name: Toma, Kenji
name: Takahara, Fumio
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Relativistic jets in active galactic nuclei, galactic microquasars, and gamma-ray bursts are widely considered to be magnetohydrodynamically driven by black hole accretion systems, although conversion mechanism from Poynting into particle kinetic energy flux is still open. Recent detailed numerical and analytical studies of global structures of steady, axisymmetric magnetohydrodynamic (MHD) flows with specific boundary conditions have not reproduced as rapid an energy conversion as required by observations. In order to find more suitable boundary conditions, we focus on the flow along a poloidal magnetic field line just inside the external boundary, without treating transfield force balance in detail. We find some examples of the poloidal field structure and corresponding external pressure profile for an efficient and rapid energy conversion as required by observations, and that the rapid acceleration requires a rapid decrease of the external pressure above the accretion disk. We also clarify the differences between the fast magnetosonic point of the MHD flow and the sonic point of de Laval nozzle.
description: 18 pages, 7 figures, PTEP accepted
title: Ανάπτυξη συστήματος για τη διαχείριση προγράμματος μαθημάτων και αιθουσών διδασκαλίας του Πολυτεχνείου Κρήτης
Creators: name: Κουτσουρινάκης Σπυρίδων-Αντώνιος
Publisher: name: Technical University of Crete
Year: 2008

description: Μη διαθέσιμο
Multifield Inflation after Planck: The Case for Nonminimal Couplings
Creators: name: Kaiser, David I.
name: Sfakianakis, Evangelos I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Multifield models of inflation with nonminimal couplings are in excellent agreement with the recent results from {\it Planck}. Across a broad range of couplings and initial conditions, such models evolve along an effectively single-field attractor solution and predict values of the primordial spectral index and its running, the tensor-to-scalar ratio, and non-Gaussianities squarely in the observationally most-favored region. Such models also can amplify isocurvature perturbations, which could account for the low power recently observed in the CMB power spectrum at low multipoles. Future measurements of primordial isocurvature perturbations and the tensor-to-scalar ratio may serve to distinguish between the currently viable possibilities.
description: 13 pages, 4 figures. Minor changes to match published version
title: Υλοποίηση σε αναδιατασσόμενη λογική των πινάκων ουράνιου τόξου (rainbow tables) για την αποκρυπτογράφηση των κρυπταλγόριθμων Lmhash, MD5, SHA1
Creators: name: Θεοχαρούλης Κωνσταντίνος
Publisher: name: Technical University of Crete
Year: 2008

description: Μη διαθέσιμο
Band-edge Exciton States in a Single-walled Carbon Nanotube Revealed by Magneto-optical Spectroscopy in Ultra-high Magnetic Field
Creators: name: Zhou, Weihang
name: Sasaki, Tatsuya
name: Nakamura, Daisuke
name: Liu, Huaping
name: Kataura, Hiromichi
name: Takeyama, Shojiro
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report high field magneto-optical study on the first and second sub-band transitions of single-chirality single-walled carbon nanotubes. The ordering and relative energy splitting between bright and dark excitonic states were found to be inverse between the first and second subbands. We verified that the zero-momentum dark singlet exciton lies below the bright exciton for the first subband transitions, while for the second sub-band transitions, it was found to have higher energy than the bright excitonic state. Effect of this peculiar excitonic structure was found to manifest itself in distinctive Aharonov-Bohm splitting in ultra-high magnetic fields up to 190 T.
description: 4 pages, 3 figures
Ein gnostisches Goldamulet aus Gellep
Creators: name: Siebourg, Max
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 103 (1898): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
title: Βελτιστοποίηση σχεδιασμού αυτόνομων υβριδικών συστημάτων φωτοβολταϊκών στοιχείων και ανεμογεννητριών
Creators: name: Νικολαΐδης Βασίλης
Publisher: name: Technical University of Crete
Year: 2008

description: Μη διαθέσιμο
On time and space double-slit experiments
Creators: name: Bauer, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Time double-slit interference experiments have been achieved and presented as complementary to spatial double-slit interference experiments, providing a further confirmation of the wave-particle duality. Numerical solutions of the free particle time dependent Schrödinger equation were presented as explanation of the experimental results, but have been objected to on the basis that the standard non relativistic quantum theory does not have the property of coherence in time. In this note the theoretical and experimental results are derived in a schematic but analytic solution of the TDSE with appropiate initial boundary conditions. The particular boundary conditions are justified by the experimental setups that actually result in having only a single electron at any given time in the double-slit arrangement; and consequently achieve the construction of double peak single electron wave packets. The progressive complementarity of "which-path" ("which-time") information and "space interference" ("oscillating time transient") pattern build up is also exhibited.
description: 8 pages
Bericht über die Thätigkeit der Provinzialkommission für die Denkmalpflege in der Rheinprovinz vom 1. April 1897 bis 31. März 1898
Creators: name: Clemen, Paul
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 103 (1898): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
title: Health care professional recruitment of patients and family carers to palliative care randomised controlled trials
title: A qualitative multiple case study
titleType: Subtitle
Creators: name: Dunleavy, Lesley
Publisher: name: Lancaster University
Year: 2021

description: Introduction: Trial recruitment is an interactional process between health care professionals, patients and carers. There is limited understanding of how health care professionals carry out this role in palliative care trials as well as the reasons why they do or do not recruit eligible participants. The ‘6 Ps’ of the ‘Social Marketing Mix Framework’ may help guide recruitment planning, but most evidence is anecdotal. The ‘6 Ps’ are; identifying participants, product, price, place, promotion and working with partners. Aims: To explore how health care professionals undertake recruitment to palliative care randomised controlled trials and the factors that influence the strategies they use and the decisions they make during the recruitment process. Method: A narrative synthesis of palliative care trial recruitment barriers and facilitators identified in existing trial literature informed the study design. A qualitative multiple case study, using Yin’s approach, was conducted. Cases were diverse UK palliative care trials across a variety of settings. Participants included study investigators and research staff involved in the recruitment process from trial coordinating centres and clinical recruitment sites. Data collection included interviews and study documentation. Analysis was informed by developing and refining theoretical propositions, guided by the ‘6Ps’ as an initial analytical framework. Framework Analysis guided within and then cross-case analysis. Results Three cases were included in the study (n = 3, 9, 7 participants). Cross-case analysis suggests the ‘6 Ps’ are a useful framework for understanding recruitment processes but wider contextual issues also need to be incorporated. These include the ‘emotional labour’ of diagnosing dying and communicating palliative and end-of-life care to potential participants and how the recruitment process is influenced by the power relationships and hierarchies that exist among professional groups. These factors can lead to and support paternalistic practices. Discussion/conclusion Those planning trials need to ensure that trial recruiters, depending on their experience and trial characteristics, have access to training and support to address the ‘emotional labour’ of recruitment. Consideration also needs to be given to who is primarily responsible for the patient’s care when choosing a Principal Investigator.
Bounding the speed of `spooky action at a distance'
Creators: name: Yin, Juan
name: Cao, Yuan
name: Yong, Hai-Lin
name: Ren, Ji-Gang
name: Liang, Hao
name: Liao, Sheng-Kai
name: Zhou, Fei
name: Liu, Chang
name: Wu, Yu-Ping
name: Pan, Ge-Sheng
name: Zhang, Qiang
name: Peng, Cheng-Zhi
name: Pan, Jian-Wei
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the well-known EPR paper, Einstein et al. called the nonlocal correlation in quantum entanglement as `spooky action at a distance'. If the spooky action does exist, what is its speed? All previous experiments along this direction have locality loopholes and thus can be explained without having to invoke any `spooky action' at all. Here, we strictly closed the locality loopholes by observing a 12-hour continuous violation of Bell inequality and concluded that the lower bound speed of `spooky action' was four orders of magnitude of the speed of light if the Earth's speed in any inertial reference frame was less than 10^(-3) times of the speed of light.
description: 11 pages, 4 figures