cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Μελέτη, Σχεδίαση και Υλοποίηση Ηλεκτρονικού Συστήματος Αυτοματοποιημένης Κοκκομετρίας Άμμου για Ιζηματολογικές Αναλύσεις:
Creators: name: Παπαλαζάρου, Αναστάσιος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Αυτοματοποιημένη Κοκκομετρία με Μικροελεγκτή
Τεχνική μέτρησης ταχύτητας καθίζησης
Μέτρηση ταχύτητας καθίζησης με μέτρηση μεταβολής πίεσης
Automated Sand Granulometry by Microcontroller
Settling Tube Measurement Technique
Settling velocity measurement by sensing Pressure Variations

description: Διερευνάται μία εναλλακτική μέθοδος Κοκκομετρίας και υλοποιείται μία ηλεκτρονική διάταξη που να βασίζεται σ’ αυτήν. Αποσκοπεί στην περισσότερο αυτοματοποιημένη και σύντομη διαδικασία μέτρησης σε σχέση με το κλασικό κοσκίνισμα καθώς και στην ηλεκτρονική επεξεργασία των αποτελεσμάτων. Η μέθοδος βασίζεται στη γνωστή εξάρτηση της διαμέτρου των κόκκων με την ταχύτητα καθίζησής τους που περιγράφεται από το νόμο του Stokes. Η ύπαρξη των κόκκων μέσα σε μία στήλη νερού προκαλεί αύξηση της υδροστατικής πίεσης αφού αυξάνει το ειδικό βάρος του νερού. Μετρώντας την αύξηση αυτή και το χρόνο στον οποίο αποκαθίσταται η πίεση στην αρχική της τιμή, μετράται ο χρόνος (και, συνεπώς, η ταχύτητα) καθίζησης των κόκκων. Στοχεύοντας σε πολύ περιορισμένο κόστος χρησιμοποιήθηκε αισθητήριο πίεσης για περιβάλλον αέρα και όχι νερού. Η διάταξη σχεδιάστηκε έτσι ώστε να παρεμβάλλεται αέρας μεταξύ του νερού και του αισθητηρίου. Αυτό προκαλεί σημαντικές δυσλειτουργίες της μεθόδου, αλλά οι περισσότερες συνέπειές τους αντιμετωπίζονται στο μεγαλύτερο βαθμό από το συνοδευτικό λογισμικό το οποίο κατασκευάστηκε ειδικά για την εργασία αυτή. Η κατασκευή αποτελείται από μηχανική κατασκευή δύο στηλών νερού, την ηλεκτρονική διάταξη μέτρησης της πίεσης και το εξειδικευμένο λογισμικό για την επεξεργασία των μετρήσεων. Τα αποτελέσματα αφήνουν να φανεί η αποτελεσματικότητα της μεθόδου, αλλά και η άμεση εξάρτησή της από την ποιότητα της μηχανικής κατασκευής και του αισθητηρίου πίεσης.
description: A particle-size analysis technique, alternative to classic sieving method, is investigated and implemented in order to achieve faster and automated measuring process and data storage. It is based on the well-known dependence between sand grain diameter and settling velocity as described by Stokes law. The existence of sand grains inside a water tube causes minor pressure increase due to density increase. Settling time is measured by tracing this pressure increase and the time that it needs to restore to its former value. Then, velocity is easily calculated. Aiming to low cost, an air-environment pressure sensor is used. The device has been designed in a way that air is inserted between water and the sensor. This causes significant malfunctions but the supporting software that is specially designed for this method confronts most of them. The implementation consists of the two settling tubes mechanical construction, the electronic measuring device and the custom made accompanying software. The results produced prove the effectiveness of this technique but they, also, reveal the direct dependence on the construction quality and pressure sensor specifications.
p-Adic and Adelic Cosmology: p-Adic Origin of Dark Energy and Dark Matter
Creators: name: Dragovich, Branko
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A brief review of p-adic and adelic cosmology is presented. In particular, p-adic and adelic aspects of gravity, classical cosmology, quantum mechanics, quantum cosmology and the wave function of the universe are considered. p-Adic worlds made of p-adic matters, which are different from real world of ordinary matter, are introduced. Real world and p-adic worlds make the universe as a whole. p-Adic origin of the dark energy and dark matter are proposed and discussed.
description: 18 pages, to appear in the Proceedings of the '2nd International Conference on p-Adic Mathematical Physics' (Belgrade, 15-21 September 2005) published by AIP Conference Proceedings
Evolution of Galaxy Star Formation and Metallicity: Impact on Double Compact Objects Mergers
Creators: name: Boco, Lumen
name: Lapi, Andrea
name: Chruslinska, Martyna
name: Donevski, Darko
name: Sicilia, Alex
name: Danese, Luigi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the impact of different galaxy statistics and empirical metallicity scaling relations on the merging rates and on the properties of compact objects binaries. First, we analyze the similarities and differences of using the star formation rate functions or the stellar mass functions as galaxy statistics for the computation of the cosmic star formation rate density. Then we investigate the effects of adopting the Fundamental Metallicity Relation or a classic Mass Metallicity Relation to assign metallicity to galaxies with given properties. We find that when the Fundamental Metallicity Relation is exploited, the bulk of the star formation occurs at relatively high metallicities even at high redshift; the opposite holds when the Mass Metallicity Relation is employed, since in this case the metallicity at which most of the star formation takes place strongly decreases with redshift. We discuss the various reasons and possible biases originating this discrepancy. Finally, we show the impact that these different astrophysical prescriptions have on the merging rates and on the properties of compact objects binaries; specifically, we present results for the redshift dependent merging rates and for the chirp mass and time delay distributions of the merging binaries.
description: 19 pages, 12 figures
Ground states of colloidal molecular crystals on periodic substrates
Creators: name: Shawish, Samir El
name: Dobnikar, Jure
name: Trizac, Emmanuel
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Two dimensional suspensions of spherical colloids subject to periodic external fields exhibit a rich variety of molecular crystalline phases. We study in simulations the ground state configurations of dimeric and trimeric systems, that are realized on square and triangular lattices, when either two or three macroions are trapped in each external potential minimum. Bipartite orders of the checkerboard or stripe types are reported together with more complex quadripartite orderings, and the shortcomings of envisioning the colloids gathered in a single potential minimum as a composite rigid object are discussed. This work also sheds light on simplifying assumptions underlying previous theoretical treatments and that made possible the mapping onto spin models.
description: 12 pages, 13 figures
SLITronomy: towards a fully wavelet-based strong lensing inversion technique
Creators: name: Galan, A.
name: Peel, A.
name: Joseph, R.
name: Courbin, F.
name: Starck, J. -L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Strong gravitational lensing provides a wealth of astrophysical information on the baryonic and dark matter content of galaxies. It also serves as a valuable cosmological probe by allowing us to measure the Hubble constant independently of other methods. These applications all require the difficult task of inverting the lens equation and simultaneously reconstructing the mass profile of the lens along with the original light profile of the unlensed source. As there is no reason for either the lens or the source to be simple, we need methods that both invert the lens equation with a large number of degrees of freedom and also enforce a well-controlled regularisation that avoids the appearance of spurious structures. This can be beautifully accomplished by representing signals in wavelet space. Building on the Sparse Lens Inversion Technique (SLIT), in this work we present an improved sparsity-based method that describes lensed sources using wavelets and optimises over the parameters given an analytical lens mass profile. We apply our technique on simulated HST and E-ELT data, as well as on real HST images of lenses from the Sloan Lens ACS (SLACS) sample, assuming a lens model. We show that wavelets allow us to reconstruct lensed sources containing detailed substructures when using both present-day data and high-resolution images from future thirty-meter-class telescopes. Wavelets moreover provide a much more tractable solution in terms of quality and computation time compared to using a source model that combines smooth analytical profiles and shapelets. Requiring very little human interaction, our pixel-based technique fits into the effort to devise automated modelling schemes. It can be incorporated in the standard workflow of sampling analytical lens model parameters. The method, which we call SLITronomy, is freely available as a new plug-in to the modelling software Lenstronomy.
Continuous time random walks under Markovian resetting
Creators: name: Méndez, Vicenç
name: Masó-Puigdellosas, Axel
name: Sandev, Trifce
name: Campos, Daniel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We investigate the effects of markovian resseting events on continuous time random walks where the waiting times and the jump lengths are random variables distributed according to power law probability density functions. We prove the existence of a non-equilibrium stationary state and finite mean first arrival time. However, the existence of an optimum reset rate is conditioned to a specific relationship between the exponents of both power law tails. We also investigate the search efficiency by finding the optimal random walk which minimizes the mean first arrival time in terms of the reset rate, the distance of the initial position to the target and the characteristic transport exponents.
description: Submitted to PRE
Πολιτική και παιδεία στον Πλάτωνα και στον Αριστοτέλη:
Creators: name: Γκουγκούρη, Ιωάννα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Πολιτική
Παιδεία
Ηθική
Politics
Education
Ethics

description: Σκοπός της διατριβής ήταν η μελέτη των απόψεων των δύο μεγάλων φιλοσόφων Πλάτωνα και Αριστοτέλη σχετικά με τις απόψεις τους για την πολιτική και την παιδεία καθώς επίσης και την σχέση πολιτικής και ηθικής. Στη συνέχεια παρουσιάσαμε αναλυτικά τις δύο διαφορετικές απόψεις που είχαν οι φιλόσοφοι σχετικά με το πώς αντιλαμβάνονται την διαπαιδαγώγηση των νέων και πως θα φτάσει κανείς να ζει τον ευδαίμονα βίο. Παράλληλα κάναμε και μια σύγκριση των δυο με τις απόψεις των σοφιστών και του Σωκράτη. Τέλος, σκοπός της μελέτης ήταν να εστιάσει τον ρόλο του φιλοσόφου όπως αυτό παρουσιάζεται στα έργα των δυο μεγάλων φιλοσόφων, και στις απόψεις τους περί πολιτικής και παιδείας επιχειρώντας και μια σύντομη αναδρομή η οποία θα καταδείξει πιο έντονα τη μεγάλη σημασία των θέσεων και απόψεων του Πλάτωνα.
description: Purpose of this thesis is the study of the views, of the two great philosophers, Plato and Aristotle regarding politics and education and the study of the relation between politics and ethics. Furthermore we present analytically two different views that the two philosophers had regarding their understanding of educating young students and how can someone achieve to live a happy life. Parallel to this analysis we compare their views with the views of Sophists and Socrates. Finally the purpose of this study was to focus on the role of the philosopher, as it is given in the works of the two great philosophers and also focuses on their views of politics and education and also we attempt a short retrospect, which will reveal and strengthen the great importance of Plato's thesis and views.
Γλωσσικές στάσεις απέναντι στην κυπριακή διάλεκτο:
Creators: name: Κυριακίδου, Ελένη Γιαννάκη
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Γλωσσικές στάσεις
Κυπριακή διάλεκτος
Κοινή Νέα Ελληνική
Language attitudes
Cypriot dialect
STandard modern greek

description: Σε αυτή τη μελέτη εξετάζονται οι γλωσσικές στάσεις απέναντι σε δυό γλωσσικές ποικιλίες της Κυπριακής διαλέκτου σε σχέση με την Κοινή Νεοελληνική στην Κύπρο. Χρησιμοποιήθηκε η μέθοδος των εναρμονισμένων αμφιέσεων για να διερευνηθούν οι στάσεις απέναντι στις ποικιλίες αυτές. Κύριος στόχος της έρευνας είναι να διερευνηθούν οι γλωσσικές στάσεις των ομιλητών και ομιλητριών απέναντι σε δύο ζέυγη γλωσσικών ποικιλιών: α) στην αστική ποικιλία και στην επαρχιακή νόρμα της Κοινής Νεοελληνικής και β) στην επαρχιακή νόρμα της Κοινής Νεοελληνικής και στην Κοινή Νεοελληνική. Τα αποτελέσματα έδειξαν ότι από τη μία η αστική ποικιλία αξιολογείται χαμηλότερα σε σχέση με τις άλλες δύο ποικιλίες και από την άλλη η επαρχιακή νόρμα της Κοινής Νεοελληνικής δεν τυγχάνει χαμηλότερης αξιολόγησης από την Κοινή Νεοελληνική.
description: This study examines the language attitudes towards the linguistic varieties of the Cypriot dialect in relation to the standard Modern Greek language in Cyprus. The method used was the matched-guise technique as an attempt to investigate attitudes towards these linguistic varieties. The principal aim of this study is to reveal the subjects’ judgement on two pairs of linguistic varieties a) the urban Cypriot variety and the standard Greek language as used in Cyprus and b) the standard Greek language as used in Cyprus and the standard Modern Greek language. The findings indicated that on the one hand, the urban Cypriot variety was evaluated as the lower variety and on the other hand that there were not any statistical important divergence among standard Greek language as used in Cyprus and the standard Modern Greek language.
Elementary example of exact effective-Hamiltonian computation
Creators: name: Głazek, Stanisław D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present an exact computation of effective Hamiltonians for an elementary model obtained from the Yukawa theory by going to the limit of bare fermions being infinitely heavy and bare bosons being at rest with respect to the fermions that emit or absorb them. The coupling constant can be arbitrarily large. The Hamiltonians are computed by solving the differential equation of the renormalization group procedure for effective particles (RGPEP). Physical fermions, defined in the model as eigenstates of the effective Hamiltonians, are obtained in the form of an effective fermion dressed with a coherent state of effective bosons. The model computation illustrates the method that can be used in perturbative computations of effective Hamiltonians for realistic theories. It shows the mechanism by which the perturbative expansion and Tamm-Dancoff approximation increase in accuracy along the RGPEP evolution.
description: 33 pages, 1 figure, plain latex
Boundary Topological Superconductors
Creators: name: Li, Bo-Xuan
name: Yan, Zhongbo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: For strongly anisotropic time-reversal invariant (TRI) insulators in two and three dimensions, the band inversion can occur respectively at all TRI momenta of a high symmetry axis and plane. Although these classes of materials are topologically trivial as the strong and weak $Z_{2}$ indices are all trivial, they can host an even number of unprotected helical gapless edge states or surface Dirac cones on some boundaries. We show in this work that when the gapless boundary states are gapped by $s_{\pm}$-wave superconductivity, a boundary time-reversal invariant topological superconductor (BTRITSC) characterized by a $Z_{2}$ invariant can be realized on the corresponding boundary. Since the dimension of the BTRITSC is lower than the bulk by one, the whole system is a second-order TRI topological superconductor. When the boundary of the BTRITSC is further cut open, Majorana Kramers pairs and helical gapless Majorana modes will respectively appear at the corners and hinges of the considered sample in two and three dimensions. Furthermore, a magnetic field can gap the helical Majorana hinge modes of the three-dimensional second-order TRI topological superconductor and lead to the realization of a third-order topological superconductor with Majorana corner modes. Our proposal can potentially be realized in insulator-superconductor heterostructures and iron-based superconductors whose normal states take the desired inverted band structures.
description: 7+3 pages, 5 figures, some typos are corrected and new references are added
On Radicals of Module Coalgebras
Creators: name: Chen, Yuqun
name: Ng, Siu-Hung
name: Shum, Kar-Ping
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16W30

description: We introduce the notion of idempotent radical class of module coalgebras over a bialgebra B. We prove that if R is an idempotent radical class of B-module coalgebras, then every B-module coalgebra contains a unique maximal B-submodule coalgebra in R. Moreover, a B-module coalgebra C is a member of R if, and only if, DB is in R for every simple subcoalgebra D of C. The collection of B-cocleft coalgebras, and the collection of H-projective module coalgebras over a Hopf algebra H are idempotent radical classes. As applications, we use these idempotent radical classes to give another proofs for a projectivity theorem and a normal basis theorem of Schneider without assuming bijective antipode.
description: 13 pages
Well-posedness and regularity for a fractional tumor growth model
Creators: name: Colli, Pierluigi
name: Gilardi, Gianni
name: Sprekels, Jürgen
Publisher: name: Weierstrass Institute
Year: 2019
Subjects: subject: Fractional operators
subject: Cahn--Hilliard systems
subject: well-posedness
subject: regularity of solutions
subject: tumor growth models
subject: 35Q92
subject: 92C17
subject: 35K35
subject: 35K90

description: In this paper, we study a system of three evolutionary operator equations involving fractional powers of selfadjoint, monotone, unbounded, linear operators having compact resolvents. This system constitutes a generalization of a phase field system of Cahn--Hilliard type modelling tumor growth that has been proposed in Hawkins-Daarud et al. (Int. J. Numer. Math. Biomed. Eng. 28 (2012), 3--24) and investigated in recent papers co-authored by the present authors and E. Rocca. The model consists of a Cahn--Hilliard equation for the tumor cell fraction φ, coupled to a reaction-diffusion equation for a function S representing the nutrient-rich extracellular water volume fraction. Effects due to fluid motion are neglected. The generalization investigated in this paper is motivated by the possibility that the diffusional regimes governing the evolution of the different constituents of the model may be of different (e.g., fractional) type. Under rather general assumptions, well-posedness and regularity results are shown. In particular, by writing the equation governing the evolution of the chemical potential in the form of a general variational inequality, also singular or nonsmooth constributions of logarithmic or of double obstacle type to the energy density can be admitted.
The Extended Algebra of the SU(2) Wess-Zumino-Witten Models
Creators: name: Mathieu, Pierre
name: Ridout, David
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The Wess-Zumino-Witten model defined on the group SU(2) has a unique (non-trivial) simple current of conformal dimension k/4 for each level k. The extended algebra defined by this simple current is carefully constructed in terms of generalised commutation relations, and the corresponding representation theory is investigated. This extended algebra approach is proven to realise a faithful ("free-field-type") representation of the SU(2) model. Subtleties in the formulation of the extended theory are illustrated throughout by the k=1, 2 and 4 models. For the first two cases, bases for the modules of the extended theory are given and rigorously justified.
description: 42 pages, 2 figures; added further motivational material and corrected typos
Using fairness instrumentally versus being treated fairly : a structural resolution
Creators: name: Pillutla, Madan Mohan
Publisher: name: University of British Columbia
Year: 2009

description: Research on justice in social exchange distinguishes between fairness as a goal and fairness as an interpersonal influence strategy. Strategic fairness is considered to be epiphenomenal and explainable by more basic motives, most notably, self-interest; fairness as a goal is based only on Lerner’s (1982) model. Recent findings contribute to a new model which specifies that allocators of resources use fairness strategically while recipients treat justice as a goal by reacting to perceived injustice. This dissertation presents the model along with an experimental test of its predictions, which also addresses an ongoing debate in experimental economics on the role of fairness in ultimatum and dictator games. The experiment was designed to distinguish between fairness as an interpersonal strategy and fairness as a goal. Participants moved from allocator to recipient roles in various experimental conditions that varied their information and interdependence. Results show that ultimatum offerers made smaller offers when respondents knew how much they were dividing and larger offers when fairness was salient. Dictators made smaller offers than ultimatum offerers, but did not reduce their offers as much as ultimatum offerers when the respondent did not know how much was being divided. They appeared unaffected by the salience of fairness. Respondents rejected more small offers than large ones and more offers when they knew the amount being divided. The rejection rates of ultimatum and dictator offers did not vary. The results show substantive support for the idea that justice motives are role specific. Unexpected findings led to modifications of the model with respect to the interdependence of the actors. The results are discussed in terms of their implications for the study of justice in general and for the specific case of fairness concerns in bargaining games.
Quantum Quasi-Monte Carlo algorithm for out-of-equilibrium Green functions at long times
Creators: name: Bertrand, Corentin
name: Bauernfeind, Daniel
name: Dumitrescu, Philipp T.
name: Maček, Marjan
name: Waintal, Xavier
name: Parcollet, Olivier
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We extend the recently developed Quantum Quasi-Monte Carlo (QQMC) approach to obtain the full frequency dependence of Green functions in a single calculation. QQMC is a general approach for calculating high-order perturbative expansions in power of the electron-electron interaction strength. In contrast to conventional Markov chain Monte Carlo sampling, QQMC uses low-discrepancy sequences for a more uniform sampling of the multi-dimensional integrals involved and can potentially outperform Monte Carlo by several orders of magnitudes. A core concept of QQMC is the a priori construction of a "model function" that approximates the integrand and is used to optimize the sampling distribution. In this paper, we show that the model function concept extends to a kernel approach for the computation of Green functions. We illustrate the approach on the Anderson impurity model and show that the scaling of the error with the number of integrand evaluations $N$ is $\sim 1/N^{0.86}$ in the best cases, and comparable to Monte Carlo scaling $\sim 1/N^{0.5}$ in the worst cases. We find a systematic improvement over Monte Carlo sampling by at least two orders of magnitude while using a basic form of model function. Finally, we compare QQMC results with calculations performed with the Fork Tensor Product State (FTPS) method, a recently developed tensor network approach for solving impurity problems. Applying a simple Padé approximant for the series resummation, we find that QQMC matches the FTPS results beyond the perturbative regime.
description: 18 pages, 11 figures
Ανάλυση γραμμών παραγωγής: Ένα εγχειρίδιο μοντέλων εκτίμησης και βελτιστοποίησης:
Creators: name: Μαρίνη, Καλλιρόη Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Γραμμή παραγωγής
Εκτιμητικό μοντέλο
Μέθοδος βελτιστοποίησης
Production line
Evaluative model
Optimization method

description: Σκοπός της παρούσας εργασίας είναι η δημιουργία ενός εγχειριδίου αλγορίθμων μοντελοποίησης και βελτιστοποίησης των γραμμών παραγωγής και επιπλέον η ενσωμάτωση κάποιων στοιχείων κόστους στην ανάλυση σε θεωρητικό επίπεδο. Σε όρους πραγματικών συστημάτων αυτό συνεπάγεται τον υπολογισμό της απόδοσης της γραμμής δεδομένων χαρακτηριστικών (μοντελοποίηση) ή τον υπολογισμό της απόδοσης της γραμμής μετά την πραγματοποίηση συγκεκριμένων αλλαγών στα χαρακτηριστικά της (βελτιστοποίηση). Η εργασία στηρίχθηκε στους αλγορίθμους που περιλαμβάνονται στο δικτυακό τόπο http://purl.oclc.org/NET/prodline και είναι αποτέλεσμα συλλογικής συνεισφοράς πολλών ακαδημαϊκών που συγκέντρωσαν το έργο τους σε ένα υπολογιστικό περιβάλλον προκειμένου να διευκολύνουν το έργο των νέων συναδέλφων τους. Ουσιαστικά, στην παρούσα εργασία παρουσιάζεται το θεωρητικό υπόβαθρο στο οποίο στηρίζεται το περιβάλλον εργασίας prodline και σε δεύτερη φάση επιχειρείται η αξιολόγηση των αλγορίθμων που περιέχονται σε αυτό. Με τον τρόπο αυτό, η παρούσα εργασία μπορεί να αποτελέσει ένα χρήσιμο εγχειρίδιο για τους ερευνητές που επιθυμούν να έρθουν σε επαφή με το αντικείμενο των γραμμών παραγωγής.
description: The aim of the present thesis is the creation of a tutorial of modeling and optimization algorithms of production lines and moreover the analysis of some cost parameters. When ‘speaking’ about real systems, this leads to the calculation of the throughput of a line with known characteristics (modeling) or the calculation of the throughput of a line after the implementation of some specific changes to its characteristics. The thesis was based in the algorithms contained in the site http://purl.oclc.org/NET/prodline which is the result of the contribution of many academicians that assembled their work in a calculating environment in order to facilitate the work of their new colleagues. Substantially, the present work presents the theoretical background of the environment mentioned above (prodline) and furthermore attempts to evaluate the algorithms contained in this. As a result, the present thesis can constitute a useful handbook for the researchers who wish to be introduced to the ‘world’ of production lines.
CHET EL PSIXOLOGIYASIDA SHAXS REGULYATSIYASINING XORIJ TAJRIBASI
Creators: name: Sultanqulova, Gulnora
Publisher: name: Zenodo
Year: 2024

description: Ushbu maqola chet el psixologlari tomonidan shaxsning ehtiyojlari, qiziqshlari, mayllari va motivlari ta`sirida yuzaga keladigan regulyatsion jarayonlarni hamda bu jarayon yoshlarni o’quv-tarbiyaviy faoliyatiga bugungi kunda qanchalik darajada ta`sir etayotgani, uning ijobiy salohiyatni rivojlantirish muammolari va yechimlarini tatbiq etishni nazarda tutadi.
The density profiles of hot galactic halo gas
Creators: name: Hansen, Steen H.
name: Sommer-Larsen, Jesper
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Extended gas haloes around galaxies are a ubiquitous prediction of galaxy formation scenarios. However, the density profiles of this hot halo gas is virtually unknown, although various profiles have been suggested on theoretical grounds. In order to quantitatively address the gas profile, we compare galaxies from direct cosmological simulations with analytical solutions of the underlying gas equations. We find remarkable agreement between simulations and theoretical predictions. We present an expression for this gas profile with a non-trivial dependence on the total mass profile. This expression is useful when setting up equilibrium galaxy models for numerical experiments.
description: 5 pages, 2 figures
Deformation Quantization and Reduction
Creators: name: Cattaneo, Alberto S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53D55 (Primary) 20G42, 51P05, 53D17, 57R56, 58A50, 81T70 (Secondary)

description: This note is an overview of the Poisson sigma model (PSM) and its applications in deformation quantization. Reduction of coisotropic and pre-Poisson submanifolds, their appearance as branes of the PSM, quantization in terms of L-infinity and A-infinity algebras, and bimodule structures are recalled. As an application, an "almost" functorial quantization of Poisson maps is presented if no anomalies occur. This leads in principle to a novel approach for the quantization of Poisson-Lie groups.
description: 23 pages, 3 figures; added references, corrected typos
Πλατωνικές παιδαγωγικές απόψεις:
Creators: name: Στεφάνου, Νικόλαος Στεφάνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Παιδεία
Αγωγή
Πλάτωνας
Plato
Education
Instruction

description: Σκοπός της συγκεκριμένης διατριβής υπήρξε η προσέγγιση των παιδαγωγικών αντιλήψεων του Πλάτωνα. Αρχικά, εξετάστηκε το γενικό περιεχόμενο του όρου «παιδεία» στην αρχαία Ελλάδα και ειδικότερα σε Σπάρτη και Αθήνα. Στη συνέχεια, παρουσιάσαμε τη σημασία που κατέχει στο φιλοσοφικό σύστημα του Πλάτωνα η παιδεία και ο ευρύτερος όρος «αγωγή». Επιπλέον, προχωρήσαμε στην παρουσίαση των απόψεών του για την παιδεία μέσα από τα έργα του και συγκεκριμένα τον Πρωταγόρα, τον Μένωνα, το Συμπόσιο, τον Θεαίτητο. Ιδιαίτερα αναλυτικότερη αναφορά πραγματοποιούμε για τις παιδευτικές του αντιλήψεις μέσα από την Πολιτεία με τις διακριτές του εκπαιδευτικές προβλέψεις για τις ξεχωριστές κοινωνικές ομάδες και τη σημασία μουσικής, ποίησης και γυμναστικής. Τέλος, καταγράψαμε τις σχετικές ιδέες του στους Νόμους και τη σύνδεση αυτών με τη σύγχρονη παιδαγωγική επιστήμη.
description: The aim of the present thesis was the approach to Plato’s pedagogical ideas. At first, we examined the general content of the term “education” in ancient Greece and specifically in Sparta and Athens. Then, we presented the importance of education and the wider term “instruction” in Plato’s philosophy. Furthermore, we proceeded to the presentation of his views on education through his works and especially Protagoras, Meno, Symposium, Theaetetus. More analytical reference has been made to his pedagogical beliefs through Republic with his distinguishable educational suggestions for the different social groups and the importance of music, poetry and physical education. Finally, we noted down his pedagogical ideas expressed in Laws and their connection to the modern pedagogical science.
title: Uncertainty in Issue Placements and Spatial Voting
Creators: name: Mauerer, Ingrid
name: Schneider, Micha
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2019

description: Empirical applications of spatial voting approaches frequently rely on ordinal policy scales to measure the policy preferences of voters and their perceptions about party or candidate platforms. Even though it is well known that these placements are affected by uncertainty, only a few empirical voter choice models incorporate uncertainty into the choice rule. In this manuscript, we develop a two-stage approach to further the understanding of how uncertainty impacts on spatial issue voting. First, we model survey responses to ordinal policy scales where specific response styles capture the uncertainty structure in issue placements. At the second stage, we model voter choice and use the placements adjusted for the detected uncertainty as predictors in calculating spatial proximity. We apply the approach to the 2016 US presidential election and study voter preferences and perceptions of the two major candidate platforms on the traditional liberal-conservative scale and three specific issues. Our approach gives insights into how voters attribute issue positions and spatial voting behavior, and performs better than a voter choice model without accounting for uncertainty measured by AIC.
Cavity quantum electrodynamics with color centers in diamond
Creators: name: Janitz, Erika
name: Bhaskar, Mihir K.
name: Childress, Lilian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Coherent interfaces between optical photons and long-lived matter qubits form a key resource for a broad range of quantum technologies. Cavity quantum electrodynamics (cQED) offers a route to achieve such an interface by enhancing interactions between cavity-confined photons and individual emitters. Over the last two decades, a promising new class of emitters based on defect centers in diamond have emerged, combining long spin coherence times with atom-like optical transitions. More recently, advances in optical resonator technologies have made it feasible to realize cQED in diamond. This article reviews progress towards coupling color centers in diamond to optical resonators, focusing on approaches compatible with quantum networks. We consider the challenges for cQED with solid-state emitters and introduce the relevant properties of diamond defect centers before examining two qualitatively different resonator designs: micron-scale Fabry-Perot cavities and diamond nanophotonic cavities. For each approach, we examine the underlying theory and fabrication, discuss strengths and outstanding challenges, and highlight state-of-the-art experiments.
description: \copyright 2020 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited
Testing Models of Radio Galaxy Evolution and the Cosmological Impact of FR II Radio Galaxies
Creators: name: Barai, Paramita
name: Wiita, Paul J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate aspects of the cosmological evolution of FR II radio galaxies, focusing first on the abilities of models to match data for linear-sizes, radio powers, redshifts and spectral indices. Here we consider modifications to the theoretical models we had treated earlier, primarily by accounting for the growth of the radius of hotspots with source size. Better fits to the distributions of most of the data in three low-frequency surveys can be found with sensible choices of model parameters but no model yet considered gives a good match to all of the survey data simultaneously, nor does any do a good job of producing the spectral index distributions. The observational datasets are too small to completely discriminate among the models. We calculate the volume fraction of the ``relevant universe'' cumulatively occupied by the expanding radio galaxy lobes over the quasar era, when these powerful radio galaxies were much more common, and when they have been argued to play an important role in triggering galaxy formation and spreading magnetic fields and metals. We found the cumulative relevant volume filling factor of radio galaxies to be $\sim 5 %$, so we conclude that these impacts are smaller than previously estimated but that they are still significant.
description: 51 pages in ApJ preprint version, 7 figures, 7 tables. Accepted for publication in The Astrophysical Journal
Experimental studies of plasma-antenna coupling with the JET Alfven Eigenmode Active Diagnostic
Creators: name: Tinguely, R. A.
name: Puglia, P. G.
name: Fil, N.
name: Dowson, S.
name: Porkolab, M.
name: Dvornova, A.
name: Fasoli, A.
name: Fitzgerald, M.
name: Guillemot, V.
name: Huysmans, G. T. A.
name: Maslov, M.
name: Sharapov, S.
name: Testa, D.
name: Contributors, JET
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: This paper presents a dedicated study of plasma-antenna (PA) coupling with the Alfven Eigenmode Active Diagnostic (AEAD) in JET. Stable AEs and their resonant frequencies f, damping rates $γ$ < 0, and toroidal mode numbers n are measured for various PA separations and limiter versus X-point magnetic configurations. Two stable AEs are observed to be resonantly excited at distinct low and high frequencies in limiter plasmas. The values of f and n do not vary with PA separation. However, $\vertγ\vert$ increases with PA separation for the low-f, but not high-f, mode, yet this may be due to slightly different edge conditions. The high-f AE is detected throughout the transition from limiter to X-point configuration, though its damping rate increases; the low-f mode, on the other hand, becomes unidentifiable. The linear resistive MHD code CASTOR is used to simulate the frequency scan of an AEAD-like external antenna. For the limiter pulses, the high-f mode is determined to be an n = 0 GAE, while the low-f mode is likely an n = 2 TAE. During the transition from limiter to X-point configuration, CASTOR indicates that n = 1 and 2 EAEs are excited in the edge gap. These results extend previous experimental studies in JET and Alcator C-Mod; validate the computational work performed by Dvornova et al 2020 Phys. Plasmas 27 012507; and provide guidance for the optimization of PA coupling in upcoming JET energetic particle experiments, for which the AEAD will aim to identify the contribution of alpha particles to AE drive during the DT campaign.
Quark-hadron duality and production of charmonia and doubly charmed baryons in e+e- annihilation
Creators: name: Berezhnoy, A. V.
name: Likhoded, A. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the framework of quark-hadron duality, the cross section values of charmonium and doubly charmed baryon production in $e^+e^-$-annihilations have been estimated at interaction energy $\sqrt{s}=10.6$ GeV. It has been shown that the approach under discussion allows to resolve some contradictions between the experimental data and pQCD predictions.
description: 12 pages, 2 figures, RevTeX, improved English, added references, removed misprints
The effectiveness of cultural adaptation : Americans selling to Japanese and Thais
Creators: name: Pornpitakpan, Chanthika
Publisher: name: University of British Columbia
Year: 2009

description: A 2 x 4 factorial design (cultural dyads x levels of cultural adaptation) is used to investigate the effect of cultural adaptation on attraction, outcomes, perceived compliment, and perceived trustworthiness when Americans sell to Japanese and Thais. This dissertation extends the research of Francis (1989, 1991) by taking into account the influence of collectivism, perceived status differential, similarity-attraction, and social identity. The curvilinear relationship found by Francis to exist between cultural adaptation and attraction when Japanese adapt to American norms and behaviors is not replicated by the experiments. Both Thai and Japanese subjects generally perceive Americans as having a higher status than themselves. They are not threatened by Americans’ adaptation to their cultural norms and practices. For Thai subjects, the relationship between cultural adaptation and attraction, outcomes, and perceived compliment appears to be monotonic positive. For Japanese subjects, the relationship reaches a plateau beyond moderate adaptation. The no adaptation condition is rated lower in perceived trustworthiness than is the substantial adaptation condition in both the Thai and the Japanese experiments, contradicting the findings of Francis.
Dynamical models for circle covering: Brownian motion and Poisson updating
Creators: name: Jonasson, Johan
name: Steif, Jeffrey E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K99 (Primary)

description: We consider two dynamical variants of Dvoretzky's classical problem of random interval coverings of the unit circle, the latter having been completely solved by L. Shepp. In the first model, the centers of the intervals perform independent Brownian motions and in the second model, the positions of the intervals are updated according to independent Poisson processes where an interval of length $\ell$ is updated at rate $\ell^{-α}$ where $α\ge0$ is a parameter. For the model with Brownian motions, a special case of our results is that if the length of the $n$th interval is $c/n$, then there are times at which a fixed point is not covered if and only if $c<2$ and there are times at which the circle is not fully covered if and only if $c<3$. For the Poisson updating model, we obtain analogous results with $c
description: Published in at http://dx.doi.org/10.1214/07-AOP340 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Ανάλυση αποθεμάτων, προβλέψεων και πολυκριτηριακή ανάλυση: Ένα εγχειρίδιο αντιπροσωπευτικών μοντέλων:
Creators: name: Μουμτζίδου, Αναστασία Χαραλάμπους
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Διαχείριση αποθεμάτων
Πρόβλεψη
Πολυκριτηριακή ανάλυση
Inventory management
Forecasting
Multivariate analysis

description: Σκοπός της διατριβής ήταν η δημιουργία ενός συνοπτικού και κατανοητού εγχειριδίου αντιπροσωπευτικών μοντέλων και μεθόδων διαχείρισης αποθεμάτων, πρόβλεψης και πολυκριτηριακής ανάλυσης. Τα μοντέλα αυτά συμβάλλουν στην ορθή λήψη αποφάσεων εκ μέρους των επιχειρήσεων σε θέματα που αφορούν το ύψος των διατηρηθέντων αποθεμάτων και το χρόνο παραγγελίας τους ώστε να μειωθεί η πιθανότητα ελλείψεων καθώς και η πιθανότητα διατήρησης μεγάλων ποσοτήτων αποθεμάτων που αποτελούν πηγή εξόδων για την επιχείρηση. Στη λήψη τέτοιων αποφάσεων συμβάλλει αποφασιστικά και η όσο το δυνατόν ορθότερη πρόβλεψη που βασίζεται σε δεδομένα προηγούμενων περιόδων. Τέλος, θα πρέπει να σημειωθεί πως για την λήψη σημαντικών επιχειρησιακών αποφάσεων, οι αποφασίζοντες θα πρέπει να λαμβάνουν υπόψη τους πολλαπλά κριτήρια ώστε να καλύπτονται περισσότερες πτυχές ενός ερωτήματος. Αυτό καθίσταται δυνατό μέσω της χρήσης μεθόδων πολυκριτηριακής ανάλυσης.
description: The aim of the present thesis was the creation of a concise and comprehensible handbook of representative models and techniques used for inventory management, forecasting and multivariate analysis. These models contribute in the decision-making on behalf of the enterprises as far as the height of the maintained inventories and the ordering time for new products are concerned, in order to decrease the probability of shortages as well as the probability of maintaining large amounts of inventories that constitute source of expenses for the enterprise. Another factor that contributes also making such decisions is the accurate forecasting that is based on previous periods data. Finally, it should be noted that for the making important operational and strategic decisions, the managers of the enterprises should take into consideration multiple criteria in order to cover multiple aspects of a specific question/ subject. This is realized via the use of multivariate analysis methods.
Classification of eight dimensional perfect forms
Creators: name: Sikiric, Mathieu Dutour
name: Schuermann, Achill
name: Vallentin, Frank
Publisher: name: arXiv
Year: 2006
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In this paper, we classify the perfect lattices in dimension 8. There are 10916 of them. Our classification heavily relies on exploiting symmetry in polyhedral computations. Here we describe algorithms making the classification possible.
description: 14 pages
Discovery of TeV Gamma-Ray Emission from the Cygnus Region of the Galaxy
Creators: name: Abdo, A. A.
name: Allen, B.
name: Berley, D.
name: Blaufuss, E.
name: Casanova, S.
name: Chen, C.
name: Coyne, D. G.
name: Delay, R. S.
name: Dingus, B. L.
name: Ellsworth, R. W.
name: Fleysher, L.
name: Fleysher, R.
name: Gonzalez, M. M.
name: Goodman, J. A.
name: Hays, E.
name: Hoffman, C. M.
name: Kolterman, B. E.
name: Kelley, L. A.
name: Lansdell, C. P.
name: Linnemann, J. T.
name: McEnery, J. E.
name: Mincer, A. I.
name: Moskalenko, I. V.
name: Nemethy, P.
name: Noyes, D.
name: Ryan, J. M.
name: Samuelson, F. W.
name: Parkinson, P. M. Saz
name: Schneider, M.
name: Shoup, A.
name: Sinnis, G.
name: Smith, A. J.
name: Strong, A. W.
name: Sullivan, G. W.
name: Vasileiou, V.
name: Walker, G. P.
name: Williams, D. A.
name: Xu, X. W.
name: Yodh, G. B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The diffuse gamma radiation arising from the interaction of cosmic ray particles with matter and radiation in the Galaxy is one of the few probes available to study the origin of the cosmic rays. Milagro is a water Cherenkov detector that continuously views the entire overhead sky. The large field-of-view combined with the long observation time makes Milagro the most sensitive instrument available for the study of large, low surface brightness sources such as the diffuse gamma radiation arising from interactions of cosmic radiation with interstellar matter. In this paper we present spatial and flux measurements of TeV gamma-ray emission from the Cygnus Region. The TeV image shows at least one new source MGRO J2019+37 as well as correlations with the matter density in the region as would be expected from cosmic-ray proton interactions. However, the TeV gamma-ray flux as measured at ~12 TeV from the Cygnus region (after excluding MGRO J2019+37) exceeds that predicted from a conventional model of cosmic ray production and propagation. This observation indicates the existence of either hard-spectrum cosmic-ray sources and/or other sources of TeV gamma rays in the region.
description: Submitted to Astrophysical Journal Letters
Tensor Product and Permutation Branes on the Torus
Creators: name: Schmidt-Colinet, Cornelius
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider B-type D-branes in the Gepner model consisting of two minimal models at k=2. This Gepner model is mirror to a torus theory. We establish the dictionary identifying the B-type D-branes of the Gepner model with A-type Neumann and Dirichlet branes on the torus.
description: 26 pages