cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Βιοχημικές επιδράσεις επιλεγμένων φυτοφαρμάκων σε μυς και επίμυς
Creators: name: Σαχανά, Μαγδαληνή Ι.
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Οργανοφωσφορικά
Καρβαμιδικά
Νευροτοξικότητα
Κυτταροκαλλιέργειες
Βιοχημικοί μηχανισμοί
Organophosphetes
Carbamates
Nervous system toxicity
Cell culture
Biochemical mechanisms

description: Η έρευνα που διενεργήθηκε στα πλαίσια της διδακτορικής αυτής διατριβής είχε ως πρωταρχικό στόχο τη διευκόλυνση των βιοχημικών φαινομένων και μηχανισμών που ενέχονται στην τοξική δράση που ασκούν επιλεγμένα οργανοφωσφορικά και καρδαμιδικά παρασιτοκτόνα στο νευρικό σύστημα των ζώων. Τα παρασιτοκτόνα αυτά συνιστούν μια από τις κυριότερες αιτίες δηλητηριάσεων στα ζώα. Για την πραγματοποίηση της έρευνας επιλέχθηκαν το οργανοφωσφορικό chlorpyrifos(CPF) και το καρδαμιδικό carbaryl(CB), δεδομένου ότι οι ουσίες αυτές αποτελούν δύο από τα συχνότερα χρησιμοποιούμενα παρασιτοκτόνα παγκοσμίως. Στην παρούσα διατριβή μελετήθηκαν οι νευροτοξικές του CB και CPF τόσο στο επίπεδο του νευράξονα όσο και σε αυτό της σύναξης. Στα πλαίσια αυτά, εξετάστηκε η επίδραση των παραπάνω ουσιών σε βιοχημικές παραμέτρους που συνδέονται αφενός με τη διαδικασία της ανάπτυξης των αξόνων και αφετέρου με τη διαδικασία της νευροδιαβίβασης
description: The research undertaken in the framework of this Ph.D. thesis aimed mainly at elucidating the biochemical involved in the neurotoxic actions of organophosphate and carbamate pesticides. Exposure to these compounds constitutes one of the main causes of poisoning in non-target animal species. The organophosphate chlorpyrifos(CPF) and the carbamate carbaryl(CB) were selected for the study, since these substances represent two of the most extensively used pesticides worldwide. The neurotoxicity of the CB and CPF was assessed in terms of the effects that these compounds exert on both axonal and synaptic-related events. Accordingly, this research work focused on the effects of CB and CPF on axonal development and neurotransmission
Κατάλοιπα κλενβουτερόλης σε σφάγια προβάτων καθώς και ορισμένων άλλων αναβολικών ουσιών σε βιολογικά υγρά και σφάγια νεαρών παχυνόμενων βοοειδών
Creators: name: Βοζίκης, Βασίλειος Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Αυξητικοί παράγοντες
Κατάλοιπα
Κλενβουτερόλη
B-αγωνιστές
Growth promoters
Residues
Clenbuterol
B-agonists

description: Σκοπός της διατριβής ήταν η 1)χορήγηση κλενβουτερόλης σε νεαρά άτομα 2)διερεύνηση παρουσίας κλενβουτερόλης σε πρόβατα και αλλων αναβολικών ουσιών(TRE,ZE,NDR, MTH,DES) σε ούρα και κρέας βοοειδών. Μέθοδοι Elisa και GC/MS. Συμπεράσματα για την κλενβουτερόνη είναι ότι 28 ημέρες είναι αρκετές για την αποβολή της από τους εδώδιμους ιστούς. Για τις άλλες αναβολικές ουσίες υπήρχαν μάλλον διασταυρούμενες αντιδράσεις : TRE,NDR, MTH με φυσική τεστοτερόνη και της ζερανόλης με την μυκοτοξίνη ζερραλενόνη
description: The scope of this dissertations was : 1) CBL administration to sheep testing of CBL depzetion in issues 2)testing of other anabolic substances in DES, TRE, NDR, MTH ZE beef urine and meat. Methods employed :Elisa and GC/MS. KBL is depleted from edible tissues within 28 days after administration other anabolic substances gine crossreaction : TRE, NDR, MTH with testoterone b)ZE with natural toxion zerralenone
Lorentz Symmetry Derived from Lorentz Violation in the Bulk
Creators: name: Bertolami, Orfeu
name: Carvalho, Carla
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider bulk fields coupled to the graviton in a Lorentz violating fashion. We expect that the overly tested Lorentz symmetry might set constraints on the induced Lorentz violation in the brane, and hence on the dynamics of the interaction of bulk fields on the brane. We also use the requirement for Lorentz symmetry to constrain the cosmological constant observed on the brane.
description: 13 pages, revtex; version to appear in Physical Review D
Conformal collider physics: Energy and charge correlations
Creators: name: Hofman, Diego M.
name: Maldacena, Juan
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study observables in a conformal field theory which are very closely related to the ones used to describe hadronic events at colliders. We focus on the correlation functions of the energies deposited on calorimeters placed at a large distance from the collision. We consider initial states produced by an operator insertion and we study some general properties of the energy correlation functions for conformal field theories. We argue that the small angle singularities of energy correlation functions are controlled by the twist of non-local light-ray operators with a definite spin. We relate the charge two point function to a particular moment of the parton distribution functions appearing in deep inelastic scattering. The one point energy correlation functions are characterized by a few numbers. For ${\cal N}=1$ superconformal theories the one point function for states created by the R-current or the stress tensor are determined by the two parameters $a$ and $c$ characterizing the conformal anomaly. Demanding that the measured energies are positive we get bounds on $a/c$. We also give a prescription for computing the energy and charge correlation functions in theories that have a gravity dual. The prescription amounts to probing the falling string state as it crosses the $AdS$ horizon with gravitational shock waves. In the leading, two derivative, gravity approximation the energy is uniformly distributed on the sphere at infinity, with no fluctuations. We compute the stringy corrections and we show that they lead to small, non-gaussian, fluctuations in the energy distribution. Corrections to the one point functions or antenna patterns are related to higher derivative corrections in the bulk.
description: 73 pages, 8 figures; v2: minor changes and added references; v3: more references added
Μελέτη του φαινομένου της απόπτωσης σε πυρήνες του βασικού πρόσθιου εγκεφάλου του επίμυς κατά την ανάπτυξη και μετά από βλάβη του φλοιού των εγκεφαλικών ημισφαιρίων
Creators: name: Σοφού, Σταυρούλα
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Βασικός πρόσθιος εγκέφαλος
Φλοιϊκές βλάβες
Χολινεργικός φαινότυπος
Νευροεκφυλιστικές νόσοι
Basal forebrain
Cortical abilations
Cholinergic phenotype
Neurodegenerative discases

description: Στη διατριβή αυτή μελετήθηκε ο αποπτωτικός κυτταρικός θάνατος στους πυρήνες του βασικού πρόσθιου εγκεφάλου(BF) του επίμυος κατά τη διάρκεια της ανάπτυξης και οι επιπτώσεις της αφαίρεσης του φλοιού των εγκεφαλικών ημισφαιρίων στην επιβίωση και στον φαινότυπο των νευρώνων των πυρήνων αυτών. Για τη μελέτη της απόπτωσης χρησιμοποιήθηκε η μέθοδος TUNEL και το ηλεκτρικό μικροσκόπιο. Η απόπτωση στον BF είναι μια διεργασία που εξελίσσεται την πρώιμη μεταγεννητική περίοδο και ίσως να παίζει θεμελιώδη ρόλο στην ανάπτυξη του BF και στην εδραίωση ενός λειτουργικού νευρωνικού δικτύου στην περιοχή αυτή. Η αφαίρεση του μεγαλύτερου μέρους του φλοιού, ο οποίος αποτελεί την κύρια περιοχή-στόχο και πηγή νευροτροφικών παραγόντων για τους συγκεκριμένους νευρώνες, σε διαφορετικά στάδια της ανάπτυξης δεν επηρεάζει τη βιωσιμότητα των νευρώνων του BF, ενώ προκαλεί μεταβολές στη μορφολογία των χολινεργικών του νευρώνων του BF μετά από τις βλάβες του φλοιού ίσως να οφείλεται στην ανάδρομη ή και ορθόδοξη μεταφορά νευροτροφικών παραγόντων από άλλες περιοχές του εγκεφάλου, στη δράση αυξητικών παραγόντων και στην ύπαρξη τοπικών κυκλωμάτων θετικής ανατροφοδότησης για ορισμένους από τους παραπάνων παράγοντες
description: In the present study we evaluated the pattern of apoptotic cell death in the basal forebrain(BF) of the rat during development and following ablations of the cerebral cortex. The TUNEL method and electron microscopic analysis were used for the evaluation of apoptotic cell death. Apoptotic in the BF occurs early in postnatal life and may play a fundamental role in the development and establishment of a functional neuronal network in this area. Unilateral ablations of large parts of the cerebral cortex were used in order to investigate the effects of target deprivation on BF neurons, given that the cerebral cortex is a magor target area and source of neurotrophic factors for these neurons. Extensive lesions of the cerebral cortex at different developmental stages did not affect the viability of BF neurons ; however they caused alterations in the morphology of cholinergic neurons and significant reduction of their number. Survival of BF neurons after extensive cortical lesions may be attributed to the retrograde and/or anterograde transfer of neurotrophic factors from diverse target areas, the action of growth factors, and the positive feedback of some of these factors
Statefinder Parameters for Tachyon Dark Energy Model
Creators: name: Shao, Ying
name: Gui, Yuanxing
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we study the statefinder parameters for the tachyon dark energy model. There are two kinds of stable attractor solutions in this model. The statefinder diagrams characterize the properties of the tachyon dark energy model. Our results show that the evolving trajectories of the attractor solutions lie in the total region and pass through the LCDM fixed point, which is different from other dark energy model.
description: 5 pages, 5 figures, accepted by MPLA
Detection of a bolide in Jupiter's atmosphere with Juno UVS
Creators: name: Giles, Rohini S.
name: Greathouse, Thomas K.
name: Kammer, Joshua A.
name: Gladstone, G. Randall
name: Bonfond, Bertrand
name: Hue, Vincent
name: Grodent, Denis C.
name: Gérard, Jean-Claude
name: Versteeg, Maarten H.
name: Bolton, Scott J.
name: Connerney, John E. P.
name: Levin, Steven M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The UVS instrument on the Juno mission recorded transient bright emission from a point source in Jupiter's atmosphere. The spectrum shows that the emission is consistent with a 9600-K blackbody located 225 km above the 1-bar level and the duration of the emission was between 17 ms and 150 s. These characteristics are consistent with a bolide in Jupiter's atmosphere. Based on the energy emitted, we estimate that the impactor had a mass of 250-5000 kg, which corresponds to a diameter of 1-4 m. By considering all observations made with Juno UVS over the first 27 perijoves of the mission, we estimate an impact flux rate of 24,000 per year for impactors with masses greater than 250-5000 kg.
description: Accepted in GRL. 21 pages, 3 figures
Large N gauge theories and topological cigars
Creators: name: Bertoldi, Gaetano
name: Hollowood, Timothy J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze the conjectured duality between a class of double-scaling limits of a one-matrix model and the topological twist of non-critical superstring backgrounds that contain the N=2 Kazama-Suzuki SL(2)/U(1) supercoset model. The untwisted backgrounds are holographically dual to double-scaled Little String Theories in four dimensions and to the large N double-scaling limit of certain supersymmetric gauge theories. The matrix model in question is the auxiliary Dijkgraaf-Vafa matrix model that encodes the F-terms of the above supersymmetric gauge theories. We evaluate matrix model loop correlators with the goal of extracting information on the spectrum of operators in the dual non-critical bosonic string. The twisted coset at level one, the topological cigar, is known to be equivalent to the c=1 non-critical string at self-dual radius and to the topological theory on a deformed conifold. The spectrum and wavefunctions of the operators that can be deduced from the matrix model double-scaling limit are consistent with these expectations.
description: 34 pages
3C 216: A Powerful FRII Seyfert 1 Galaxy
Creators: name: Punsly, Brian
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: 3C 216 has a weak accretion flow luminosity, well below the Seyfert1/QSO dividing line, weak broad emission lines (BELs) and powerful radio lobes. As a consequence of the extreme properties of 3C 216, it is the most convincing example known of an FR II radio source that is kinetically dominated: the jet kinetic luminosity, $Q$, is larger than the total thermal luminosity (IR to X-ray) of the accretion flow, $L_{bol}$. Using three independent estimators for the central black hole mass, we find that the jet in 3C 216 is very super-Eddington, $3.3 L_{Edd}1$, either presently or in the past based on the rarity of $L_{bol}>L_{Edd}$ quasars. The existence of $R(t)>1$ AGN is a strong constraint on the theory of the central engine of FRII radio sources.
Enabling Homomorphically Encrypted Inference for Large DNN Models
Creators: name: Lloret-Talavera, Guillermo
name: Jorda, Marc
name: Servat, Harald
name: Boemer, Fabian
name: Chauhan, Chetan
name: Tomishima, Shigeki
name: Shah, Nilesh N.
name: Peña, Antonio J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: The proliferation of machine learning services in the last few years has raised data privacy concerns. Homomorphic encryption (HE) enables inference using encrypted data but it incurs 100x-10,000x memory and runtime overheads. Secure deep neural network (DNN) inference using HE is currently limited by computing and memory resources, with frameworks requiring hundreds of gigabytes of DRAM to evaluate small models. To overcome these limitations, in this paper we explore the feasibility of leveraging hybrid memory systems comprised of DRAM and persistent memory. In particular, we explore the recently-released Intel Optane PMem technology and the Intel HE-Transformer nGraph to run large neural networks such as MobileNetV2 (in its largest variant) and ResNet-50 for the first time in the literature. We present an in-depth analysis of the efficiency of the executions with different hardware and software configurations. Our results conclude that DNN inference using HE incurs on friendly access patterns for this memory configuration, yielding efficient executions.
description: Manuscript accepted for publication in IEEE Transactions on Computers
Θεωρητική και πειραματική διερεύνηση σχηματισμού νανοσωματιδίων κατά τη δειγματοληψία καυσαερίου κινητήρων εσωτερικής καύσης
Creators: name: Βουίτσης, Ηλίας
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Νανοσωματίδια
Πυρηνογένεση
Nanoparticles
Nucleation

description: Στην εργασία διερευνάται η δυνατότητα σχηματισμού νανοσωματιδίων κατά την αραίωση και δειγματοληψία καυσαερίου μηχανών εσωτερικής καύσης(MEK). Μετρήθηκε υπό διάφορα σχήματα δειγματοληψίας καυσαέριο σχήματος Diesel σε διαφορετικής περιεκτικότητας σε θείο. Εγινε η θεωρητική τεκμηρίωση της πειραματικής διερεύνησης και αναπτύχθηκε μαθηματικό μοντέλο που ενσωματώνει τις τελευταίες θεωρήσεις για το μηχνισμό πυρηνογένεσης. Στο πλαίσιο αυτό μελετήθηκε η επίδραση διαφόρων παραμέτρων(αρχική συγκέντρωση αιθάλης, συνθήκες σταθεροποίησης) στην κατανομή της διασπειρόμενης σωματιδιακής ύλης. Το υπολογιστικά αποτελέσματα συγκρίθηκαν με τα πειραματικά και διατυπώθηκαν οι ανάγκες περαιτέρω διερεύνησης της
description: In this thesis the potential of nanoparticle formation during dilution and sampling of internal combustion engine's exhaust is investigated. A light duty diesel vehicle was measured under different sampling conditions running with fuel of different sulpher content. The experimental investigation was discuissed theoretically and a mathematical model was developed incorporating the latest considerations regarding the nucleation mechanism. In this framework the effect of several parameters(initial soot consentration, sample stabilization, conditions) on dispersed particulate matter distribution was studied numerically. Colculation and experimental results were compared and further research needs were mentioned
Από το χωράφι στο καπνομάγαζο: χρόνος, εργασία και ανθρώπινες νοοτροπίες στη Βόρεια Ελλάδα του μεσοπολέμου και των πρώτων μεταπολεμικών χρόνων
Creators: name: Τσεβρεμές, Ιωάννης Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2003

description: Σκοπός της παρούσας διατριβής υπήρξε η διερεύνησ των νοοτροπιών που αφορούν την εργασία και τη διάθεση του χρόνου, στο Βορειοελλαδικό χώρο. Αυτό έγινε για μια μεταβατική από πολλές απόψεις περίοδο, σ'έναν γεωγραφικό χώρο με αυξημένες ιδιαιτερότητες και χαρακτηριστικά. Εγινε προσπάθεια για σύζευξη των καθαρά ιστορικών με τις ανθρωπολογικές μεθόδους της επιτόπιας έρευνας, ευρεία χρήση της προφορικής συνέντευξης και των υπαρχόντων τεκμηρίων και του τοπικού τύπου. Η διατριβή καταδεικνύει τις στρεβλώσεις και τις καθυστερήσεις της περιφερειακής και εξαρτημένης ανάπτυξης, αλλά κυρίως εστιάζει στις ανθρώπινες νοοτροπίες, κρατώντας συγκριτική ματιά με άλλες περιοχές του ελλαδικού χώρου, της Μεσογείου και της δύσης
Parametrization of Tachyon Field
Creators: name: Shao, Ying
name: Gui, Yuanxing
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We assume that universe is dominated by non-relativistic matter and tachyon field and reconstruct the potential of tachyon field directly from the effective equation of state (EOS) of dark energy. We apply the method to four known parametrization of equation of state and discuss the general features of the resulting potentials.
description: 8 pages, 3 figures, accepted by MPLA
Integrability ex machina
Creators: name: Krippendorf, Sven
name: Lust, Dieter
name: Syvaeri, Marc
Publisher: name: arXiv
Year: 2021
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Determining whether a dynamical system is integrable is generally a difficult task which is currently done on a case by case basis requiring large human input. Here we propose and test an automated method to search for the existence of relevant structures, the Lax pair and Lax connection respectively. By formulating this search as an optimization problem, we are able to identify appropriate structures via machine learning techniques. We test our method on standard systems of classical integrability and find that we can single out some integrable deformations of a system. Due to the ambiguity in defining a Lax pair our algorithm identifies novel Lax pairs which can be easily verified analytically.
description: 18 pages, 1 figure, v2: modified integrable perturbation discussion
A homogeneous comparison between the chemical composition of the Large Magellanic Cloud and the Sagittarius dwarf galaxy
Creators: name: Minelli, A.
name: Mucciarelli, A.
name: Romano, D.
name: Bellazzini, M.
name: Origlia, L.
name: Ferraro, F. R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Similarities in the chemical composition of two of the closest Milky Way satellites, namely the Large Magellanic Cloud (LMC) and the Sagittarius (Sgr) dwarf galaxy, have been proposed in the literature, suggesting similar chemical enrichment histories between the two galaxies. This proposition, however, rests on different abundance analyses, which likely introduce various systematics that hamper a fair comparison among the different data sets. In order to bypass this issue (and highlight real similarities and differences between their abundance patterns), we present a homogeneous chemical analysis of 30 giant stars in LMC, 14 giant stars in Sgr and 14 giants in the Milky Way, based on high-resolution spectra taken with the spectrograph UVES-FLAMES. The LMC and Sgr stars, in the considered metallicity range ([Fe/H]>-1.1 dex), show very similar abundance ratios for almost all the elements, with differences only in the heavy s-process elements Ba, La and Nd, suggesting a different contribution by asymptotic giant branch stars. On the other hand, the two galaxies have chemical patterns clearly different from those measured in the Galactic stars, especially for the elements produced by massive stars. This finding suggests the massive stars contributed less to the chemical enrichment of these galaxies with respect to the Milky Way. The derived abundances support similar chemical enrichment histories for the LMC and Sgr.
description: 21 pages, 8 figures, Accepted for publication by ApJ
Reaction-diffusion fronts with inhomogeneous initial conditions
Creators: name: Bena, Ioana
name: Droz, Michel
name: Martens, Kirsten
name: Racz, Zoltan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Properties of reaction zones resulting from A+B -> C type reaction-diffusion processes are investigated by analytical and numerical methods. The reagents A and B are separated initially and, in addition, there is an initial macroscopic inhomogeneity in the distribution of the B species. For simple two-dimensional geometries, exact analytical results are presented for the time-evolution of the geometric shape of the front. We also show using cellular automata simulations that the fluctuations can be neglected both in the shape and in the width of the front.
description: 11 pages, 3 figures, submitted to J. Phys. C
Labelling Drifts in a Fault Detection System for Wind Turbine Maintenance
Creators: name: Martinez, Iñigo
name: Viles, Elisabeth
name: Cabrejas, Iñaki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A failure detection system is the first step towards predictive maintenance strategies. A popular data-driven method to detect incipient failures and anomalies is the training of normal behaviour models by applying a machine learning technique like feed-forward neural networks (FFNN) or extreme learning machines (ELM). However, the performance of any of these modelling techniques can be deteriorated by the unexpected rise of non-stationarities in the dynamic environment in which industrial assets operate. This unpredictable statistical change in the measured variable is known as concept drift. In this article a wind turbine maintenance case is presented, where non-stationarities of various kinds can happen unexpectedly. Such concept drift events are desired to be detected by means of statistical detectors and window-based approaches. However, in real complex systems, concept drifts are not as clear and evident as in artificially generated datasets. In order to evaluate the effectiveness of current drift detectors and also to design an appropriate novel technique for this specific industrial application, it is essential to dispose beforehand of a characterization of the existent drifts. Under the lack of information in this regard, a methodology for labelling concept drift events in the lifetime of wind turbines is proposed. This methodology will facilitate the creation of a drift database that will serve both as a training ground for concept drift detectors and as a valuable information to enhance the knowledge about maintenance of complex systems.
description: 11 pages, 2 figures, 1 table
Πρόγνωση και διάγνωση βλαβών σε ηλεκτρομηχανικά συστήματα με συνδυασμένη επεξεργασία του σήματος στα πεδία του χρόνου και συχνότητας
Creators: name: Λουτρίδης, Σπύρος Ι.
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Διάγνωση βλαβών
Μετασχηματισμός κυματιδίου
Fault diagnosis
Wavelet transform

description: Η εργασία αυτή έχει στόχο τη διάγνωση και ταυτοποίηση βλαβών σε ηλεκτρομηχανικά συστήματα. Το βασικό εργαλείο ανάλυσης σήματος που χρησιμοποιείται είναι ο συνεχής μετασχηματισμός κυματιδίου. Σε θεωρητικό επίπεδο εξετάστηκε η δυνατότητα περιγραφής της συμπεριφοράς ενός συστήματος οδοντωτών τροχών από ένα απλό μοντέλο ενός βαθμού ελευθερίας. Σε πειραματικό επίπεδο υλοποιήθηκε μια φορητή διάταξη καταγραφής δονητικών σημάτων από στοιχεία μηχανών. Ο μετασχηματισμός κυματιδίου επέτρεψε στη διάγνωση της βλάβης, την ταυτοποίηση των σφαλμάτων και την παρακολούθηση της εξέλιξης της ρωγμής.
description: The identification and diagnosis of faults in electromechanical systems is the aim of the work. The continuous wavelet transform is the main signal processing tool used. In the theoretical part, the capacity of a simple one-degree of freedom model in predicting the dynamic behavior of a spur gear pair, has been examined. In the experimental part, a portable device for the recording of vibration signatures from machine elements has been developed. The continuous wavelet transform succesfully diagnosed the fault and lead to fault identification in all cases examined.
Reconstructing the Equation of State for Dark Energy In the Double Complex Symmetric Gravitational Theory
Creators: name: Shao, Ying
name: Gui, Yuanxing
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We propose to study the accelerating expansion of the universe in the double complex symmetric gravitational theory (DCSGT). The universe we live in is taken as the real part of the whole spacetime ${\cal M}^4_C(J)$ which is double complex. By introducing the spatially flat FRW metric, not only the double Friedmann Equations but also the two constraint conditions $p_J=0$ and $J^2=1$ are obtained. Furthermore, using parametric $D_L(z)$ ansatz, we reconstruct the $ω^{'}(z)$ and $V(ϕ)$ for dark energy from real observational data. We find that in the two cases of $J=i,p_J=0$ and $J=ε,p_J\neq 0$, the corresponding equations of state $ω^{'}(z)$ remain close to -1 at present ($z=0$) and change from below -1 to above -1. The results illustrate that the whole spacetime, i.e. the double complex spacetime ${\cal M}^4_C(J)$, may be either ordinary complex ($J=i,p_J=0$) or hyperbolic complex ($J=ε,p_J\neq 0$). And the fate of the universe would be Big Rip in the future.
description: 5 pages, 5 figures, accepted by Commun. Theor. Phys
On the design of autonomous agents from multiple data sources
Creators: name: Garrabé, Émiland
name: Russo, Giovanni
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: This paper is concerned with the problem of designing agents able to dynamically select information from multiple data sources in order to tackle tasks that involve tracking a target behavior while optimizing a reward. We formulate this problem as a data-driven optimal control problem with integer decision variables and give an explicit expression for its solution. The solution determines how (and when) the data from the sources should be used by the agent. We also formalize a notion of agent's regret and, by relaxing the problem, give a regret upper bound. Simulations complement the results.
description: Extended version (12 pages) of the paper 'On the design of autonomous agents from multiple data sources' from the authors
True love stories : the tropical production and authorization of meaning
Creators: name: Aoki, Douglas Sadao
Publisher: name: University of British Columbia
Year: 2008

description: The reason that modern love is not postmodern is that it insists on being psychological. The reason that sociology treats of love so poorly is that it insists on not being poststructuralist. This project inverts this double steadfastness, in order to sociologize love as a production of its own tropes, and move from feelings to discourse without leaving feelings behind. Love's emotional body is not denied by a poststructuralist sociology, but poststructuralist theory recognizes that both the body and sociology are radically textualized. This realization puts into doubt canonical notions of feeling and fact, truth and validity, lucidity and experience, reality and representation. What emerges is literally academic literature: true love stories. As Hannah Arendt writes, "We who for the most part are neither poets nor historians are … [nonetheless] preparing the way for 'poetry', … [as if] we are … constantly expecting it to erupt in some human being." The poetics of love manifest in flights of metaphors. Then the discourse of love is distinguished by how those metaphors infloresce its meanings. If love is constituted through its tropes, any definition of it cannot but fail. This is not a descent into romantic nonsense, but a shift to a different sense of love. Love becomes open to all the polymorphous movement and play of the poststructuralist sign. Yet modern love is the tropical discourse that denies its tropicality, for modern love is love that claims that it is real. The credibility of this fiction can only be maintained through a puissant regime of truth, one which aligns love with a narrow rhetoric of Nature and mystery: "Love is just that way;" "Love explains itself;" "Love is love." If such homey platitudes are read carefully enough, they betray themselves as devices of brutal, constitutive closure. The imperative of a poststructuralist sociology of love is to deprive the modernist consciousness of such conceptual orthopaedics, in order to force it to open itself to less comforting but more compelling fictions.
Αλληλεπίδραση γυαλιού και χάλυβα: διερεύνηση της λειτουργίας και μορφολογίας με τη χρήση της fractal γεωμετρίας
Creators: name: Βυζαντιάδου, Μαρία-Μαργαρίτα
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Μη γραμμική αρχιτεκτονική
Fractal γεωμετρία
Non-linear architecture
Fractal geometry

description: Η χρήση του χάλυβα και του γυαλιού ως υλικών δόμησης στην αρχιτεκτονική από τον 19ο αιώνα ως σήμερα, έδωσε βαθμιαία νέους κατασκευαστικούς τύπους κτιρίων ως προς την οργάνωση, τη μορφή και τη λειτουργία. Οι δυνατότητες των δυο υλικών τα τελευταία χρόνια, ξεπερνούν τα όρια μιας γραμμικής αρχιτεκτονικής με καθαρά γεωμετρικά σχήματα και επιτρέπουν κατασκευές πιο πολύπλοκες ή γλυπτικές. Στα πλαίσια αυτής της διαπίστωσης προτείνεται μια νέα μεθοδολογία σχεδιασμού, η οποία υπακούει στη θεωρία των fractals, δηλ. σε κατασκευές που ακολουθούν ιεραρχική οργάνωση με μαθηματικούς κανόνες εξέλιξης. Η μέθοδος σχεδίασης περιλαμβάνει ανάπτυξη νέων αλγορίθμων σε γλώσσα C++ που δημιουργεί τρισδιάστατες απεικονίσεις κελυφών με γεωμετρική ιεράρχηση(fractal) οι οποίοι μεταφράζονται σε σχήματα με τη βοήθεια υπαρχόντων σχεδιαστικών προγραμμάτων. Τα σχέδια παράγονται στο χώρο μέσα από μαθηματικούς κανόνες εξέλιξης και έλκουν την έμπνευσή τους από τη φύση. Πρόταση της διατριβής είναι ότι αυτές οι κατασκευές μπορούν να πραγματοποιηθούν από χάλυβα και γυαλί και ως τρόπος στήριξης προτείνεται ο σημειακός τρόπος στήριξης, καθώς αυτός είναι δυνατόν να ενταχθεί σε μαι διαδικασία ιεραρχικής οργάνωσης
description: Steel and glass are the two materials whose conjunction in architecture led, since the 19th century to new solutions and new types of edifices according to function and morphology. Nowadays, the structural possibilities of these two materials have been extended so far that they overcare to limits of a linear architecture and created nonlinear and more sculptural structures. Under this concept a new design approach uses mathematical rules in the computer language(tt in order to produce original algorithms convenient for creation 3-d designs accessible to farther manipulation by the use of drawing progams. These drawings represent shells or facades which are inspired from nature. The point-fixed glazing system that can be assumed to follow a hierarchical process, is proposed as the structural frame of these drawings
Αυτοοργάνωση και στατιστική των εξαρμόσεων κατά τη μονότονη και κυκλική παραμόρφωση
Creators: name: Αυλωνίτης, Μάρκος Ι.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Αυτοοργάνωση εξαρμόσεων
Στατιστική εξαρμόσεων
Μονότονη παραμόρφωση
Θεωρία βαθμίδων
Self-organization of dislocations
Statistics of dislocations
Monotonic deformation
Cyclic deformation
Gradient theory
Κυκλική παραμόρφωση

description: Ο στόχος της παρούσης διδακτορικής διατριβής είναι η μελέτη της αυτοοργάνωσης και στατιστικής συμπεριφοράς των εξαρμόσεων κατά τη μονότονη και κυκλική παραμόρφωση. Η μελέτη γίνεται στα πλαίσια της θεωρίας βαθμίδων, της θεωρίας των πιθανοτήτων και των στοχαστικών διεργασιών. Αρχικά αναπτύσσεται ένας νέος φορμαλισμός για την εφαρμογή των ιδιοτήτων συναρτήσεων τυχαίων μεταβλητών στην εξαγωγή βαθμιδικών καταστατικών εξισώσεων για την παραμόρφωση των υλικών τόσο στη μακροκλίμακα όσο και στη μεσοκλίμακα. Στη συνέχεια γίνεται εφαρμογή της θεωρίας των στοχαστικών διεργασιών για την εξέλιξη της πυκνότητας των εξαρμόσεων κατά τη μονότονη και κυκλική παραμόρφωση. Τέλος αναπτύσσεται ένα συζευγμένο στοχαστικό-βαθμιδικό μοντέλο για την κυκλική παραμόρφωση και την πυρηνοποίηση των - παραμένουσας ολίσθησης, όπου αναπαράγονται με συνεπή τρόπο γνωστά πειραματικά δεδομένα.
description: The aim of this doctoral thesis, is the examination of self-organization and statistical behavior of dislocations during monotonic and cyclic deformation. The examination proceeds in the framework of gradient theory, probability theory and stochastic processes. Initially a new formalism for the application of standard properties of random functions leading to gradient constitutive equations is developed. What follows is the application of stochastic processes for the evolution of dislocation densities during monotonic and cyclic deformation. Finally, a complementary gradient-stochastic model for the cyclic deformation and the nucleation of persistent slip bands is developed where well-known experimental results reproduced in a good agreement.
Paper Maria
Creators: name: Cerreta, Maria
name: Fusco Girard, Luigi
Publisher: name: BDC. Bollettino Del Centro Calza Bini
Year: 2013

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description: BDC. Bollettino Del Centro Calza Bini, Vol 13, N° 1 (2013): Towards a Circular Regenerative Urban Model
Ανάπτυξη μεθοδολογίας προσδιορισμού των αιτιών οδικών ατυχημάτων
Creators: name: Γεωργιάδης, Ηλίας Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2003

description: Αντικείμενο της διατριβής είναι η ανάπτυξη μιας πρωτότυπης μεθοδολογίας προσδιορισμού των αιτιών του οδικού ατυχήματος για την Ελλάδα. Για την επίτευξη αυτού του στόχου δημιουργήθηκε μια πρότυπη βάση δεδομένων που στηρίχθηκε τόσο στη δυναμική ανάλυση της συμπεριφοράς του Ελληνα οδηγού όσο και στη μηχανική ανάλυση του τροχαίου ατυχήματος. Η δημιουργία της πρότυπης βάσης δεδομένων πραγματοποιήθηκε με τη βοήθεια πρωτότυπου μοντέλων με αποτέλεσμα του ακριβή προσδιορισμό των παραμέτρων(χρόνος αντίληψης υπό ή χωρίς την επήρεια αλκοόλ, επιβράδυνση οχημάτων κ.λ.π.) που έχουν άμεση συμβολή στο τροχαίο ατύχημα. Η διαμόρφωση της νέας μεθοδολογίας ανάλυσης των ατυχημάτων με την ενσωμάτωση της πρότυπης βάσης δεδομένων δημιούργησε τη συμβατότητα με την ευρωπαϊκή πραγματικότητα και τη σύνταξη ορολογίας για τα νέα στοιχεία που υπεισέρχονται στην ανάλυση της σύγκρουσης των οχημάτων. Η διατριβή δρομολογεί την αφετηρία του εφικτού προσδιορισμού των πραγματικών αιτιών του οδικού ατυχήματος στην Ελλάδα και δίνει έτσι τη δυνατότητα της αντιμετώπισής του με πιο αποτελεσματικό τρόπο
description: Die Doktorarbeit bezieht sich auf die Entwicklung einer Methodologie zur Bestimmung der Unfallursachen in Griechenland. In Einzelnen wunden vierschiedene Modelle entwickelt, um das Fahrverhalten der fahrer zu analysieren ihr Reaktionsverhalten mit und ohne den Einfluss vom Alkohol zu bestimmen und die Unfallaufnahme-Analyse und statistische Ausherzung zu vervollstandigen
Atom interferometer as a selective sensor of rotation or gravity
Creators: name: Dubetsky, B.
name: Kasevich, M. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: In the presence of Earth gravity and gravity-gradient forces, centrifugal and Coriolis forces caused by the Earth rotation, the phase of the time-domain atom interferometers is calculated with accuracy up to the terms proportional to the fourth degree of the time separation between pulses. We considered double-loop atom interferometers and found appropriate condition to eliminate their sensitivity to acceleration to get atomic gyroscope, or to eliminate the sensitivity to rotation to increase accuracy of the atomic gravimeter. Consequent use of these interferometers allows one to measure all components of the acceleration and rotation frequency projection on the plane perpendicular to gravity acceleration. Atom interference on the Raman transition driving by noncounterpropagating optical fields is proposed to exclude stimulated echo processes which can affect the accuracy of the atomic gyroscopes. Using noncounterpropagating optical fields allows one to get a new type of the Ramsey fringes arising in the unidirectional Raman pulses and therefore centered at the two-quantum line center. Density matrix in the Wigner representation is used to perform calculations. It is shown that in the time between pulses, in the noninertial frame, for atoms with fully quantized spatial degrees of freedom, this density matrix obeys classical Liouville equations.
description: 21 pages, 4 figures, extended references, discussion, and motivation
Public subsidies, TFP and efficiency : a tale of complex relationships
Creators: name: Bernini, Cristina
name: Cerqua, Augusto
name: Pellegrini, Guido
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: SECS-S/01 Statistica
SECS-S/03 Statistica economica

description: This paper shows that a suitable decomposition of TFP can be applied to a large sample of subsidized firms for a relevant period of time, allowing an evaluation of the impact of subsidies on either the roles of technical progress and technical efficiency change or scale and allocative efficiency change as determinants of granted firms’ long-term growth. We measure and decompose TFP using a Stochastic Frontier Analysis (SFA). The impact of capital subsidies on the different components of TFP is captured by a quasi–experimental method (Multiple RDD), exploiting the conditions for a local random experiment created by Law 488/92 (L488), which has been an important policy instrument for reducing territorial disparities in Italy. The main findings from the case study are twofold. First, capital subsidies positively affect TFP growth in the medium-long term and not in the short term. The main reason is that allocative efficiency has a positive effect only after 2-3 years. Second, the positive impact comes especially through technical progress and not through scale impact change, as may have been expected.
A sharpened nuclearity condition for massless fields
Creators: name: Dybalski, Wojciech
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81T05, 47B10, 46L40.

description: A recently proposed phase space condition which comprises information about the vacuum structure and timelike asymptotic behavior of physical states is verified in massless free field theory. There follow interesting conclusions about the momentum transfer of local operators in this model.
description: 13 pages, LaTeX. As appeared in Letters in Mathematical Physics
The Atacama Cosmology Telescope: Summary of DR4 and DR5 Data Products and Data Access
Creators: name: Mallaby-Kay, Maya
name: Atkins, Zachary
name: Aiola, Simone
name: Amodeo, Stefania
name: Austermann, Jason E.
name: Beall, James A.
name: Becker, Daniel T.
name: Bond, J. Richard
name: Calabrese, Erminia
name: Chesmore, Grace E.
name: Choi, Steve K.
name: Crowley, Kevin T.
name: Darwish, Omar
name: Denison, Edwawd V.
name: Devlin, Mark J.
name: Duff, Shannon M.
name: Duivenvoorden, Adriaan J.
name: Dunkley, Jo
name: Ferraro, Simone
name: Fichman, Kyra
name: Gallardo, Patricio A.
name: Golec, Joseph E.
name: Guan, Yilun
name: Han, Dongwon
name: Hasselfield, Matthew
name: Hill, J. Colin
name: Hilton, Gene C.
name: Hilton, Matt
name: Hlozek, Renee
name: Hubmayr, Johannes
name: Huffenberger, Kevin M.
name: Hughes, John P.
name: Koopman, Brian J.
name: Louis, Thibaut
name: MacInnis, Amanda
name: Madhavacheril, Mathew S.
name: McMahon, Jeff
name: Moodley, Kavilan
name: Naess, Sigurd
name: Namikawa, Toshiya
name: Nati, Federico
name: Newburgh, Laura B.
name: Nibarger, John P.
name: Niemack, Michael D.
name: Page, Lyman A.
name: Salatino, Maria
name: Schaan, Emmanuel
name: Schillaci, Alessandro
name: Sehgal, Neelima
name: Sherwin, Blake D.
name: Sifon, Cristobal
name: Simon, Sara
name: Staggs, Suzanne T.
name: Storer, Emilie R.
name: Ullom, Joel N.
name: Van Engelen, Alexander
name: Van Lanen, Jeff
name: Vale, Leila R.
name: Wollack, Edward J.
name: Xu, Zhilei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Two recent large data releases for the Atacama Cosmology Telescope (ACT), called DR4 and DR5, are available for public access. These data include temperature and polarization maps that cover nearly half the sky at arcminute resolution in three frequency bands; lensing maps and component-separated maps covering ~ 2,100 deg^2 of sky; derived power spectra and cosmological likelihoods; a catalog of over 4,000 galaxy clusters; and supporting ancillary products including beam functions and masks. The data and products are described in a suite of ACT papers; here we provide a summary. In order to facilitate ease of access to these data we present a set of Jupyter IPython notebooks developed to introduce users to DR4, DR5, and the tools needed to analyze these data. The data products (excluding simulations) and the set of notebooks are publicly available on the NASA Legacy Archive for Microwave Background Data Analysis (LAMBDA); simulation products are available on the National Energy Research Scientific Computing Center (NERSC).
description: Accepted to ApJS. 21 pages, 8 figures. Data and notebooks available on LAMBDA https://lambda.gsfc.nasa.gov/product/act/
Armstrong Liquid Bridge: Formation, Evolution and Breakup
Creators: name: Pan, Xueqin
name: Hu, Man
name: Xu, Bingrui
name: Wang, Feng
name: Huo, Peng
name: Chen, Fangqi
name: Gu, Zhibo
name: Deng, Daosheng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: In this paper, we experimentally explore the formation, evolution and breakup of Armstrong liquid bridge. The extremely complicated evolution stage is revealed, which involves many coupled processes including the morphology change, current variation, heat transfer, and water evaporation. By focusing on the final fate of this liquid bridge, we observe that the breakup occurs once an effective length ($\tilde{L}$) is reached. This effective length increases linearly with the applied voltage, implying a threshold electric field to sustain the liquid bridge. Moreover, by an introduced external flow, the lifetime of the liquid bridge can be controlled, while the effective length associated with the breakup is independent on the external flow rate. Hence, these findings remarkably demonstrate that the breakup of liquid bridge is directly correlated with the effective length. In order to understand this correlation, a simplified model of an electrified jet is employed to take the electric field into account. By the linear stability analysis, the attained phase diagram agrees with the experiments well. Although a more comprehensive theory is required to consider other factors such as the surface charges, these results might provide a fresh perspective on the ``century-old" Armstrong liquid bridge to further elucidate its underlying physical mechanism.
New List Decoding Algorithms for Reed-Solomon and BCH Codes
Creators: name: Wu, Yingquan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences

description: In this paper we devise a rational curve fitting algorithm and apply it to the list decoding of Reed-Solomon and BCH codes. The proposed list decoding algorithms exhibit the following significant properties. 1 The algorithm corrects up to $n(1-\sqrt{1-D})$ errors for a (generalized) $(n, k, d=n-k+1)$ Reed-Solomon code, which matches the Johnson bound, where $D\eqdef \frac{d}{n}$ denotes the normalized minimum distance. In comparison with the Guruswami-Sudan algorithm, which exhibits the same list correction capability, the former requires multiplicity, which dictates the algorithmic complexity, $O(n(1-\sqrt{1-D}))$, whereas the latter requires multiplicity $O(n^2(1-D))$. With the up-to-date most efficient implementation, the former has complexity $O(n^{6}(1-\sqrt{1-D})^{7/2})$, whereas the latter has complexity $O(n^{10}(1-D)^4)$. 2. With the multiplicity set to one, the derivative list correction capability precisely sits in between the conventional hard-decision decoding and the optimal list decoding. Moreover, the number of candidate codewords is upper bounded by a constant for a fixed code rate and thus, the derivative algorithm exhibits quadratic complexity $O(n^2)$. 3. By utilizing the unique properties of the Berlekamp algorithm, the algorithm corrects up to $\frac{n}{2}(1-\sqrt{1-2D})$ errors for a narrow-sense $(n, k, d)$ binary BCH code, which matches the Johnson bound for binary codes. The algorithmic complexity is $O(n^{6}(1-\sqrt{1-2D})^7)$.
Analysing the Provisions Effectiveness at European level for Guaranteeing Equal Pay Amongst Genders
Creators: name: Castro, Charles Alves De
Publisher: name: figshare
Year: 2021
Subjects: subject: 150305 Human Resources Management
subject: FOS: Economics and business
subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: 150308 International Business
subject: 220102 Business Ethics
subject: 150314 Small Business Management
subject: 150399 Business and Management not elsewhere classified

description: This article aims to briefly understand and evaluate the main current European provisions for equal pay amongst genders. According to the European statistics compiled in 2012, the average differential in pay between the genders was 16% (in favour of men). In light of this statistic, this article critically analyses the provisions effectiveness at European level for guaranteeing equal pay. This research was carried out through a literature review. This is important to demonstrate, explain, and evaluate the current existent literature about this specific theme covered in this article. Furthermore, the literature review gives accuracy and validation to this research. In conclusion, there is a discussion on the challenges faced by European legislation to reduce unequal wages. The main finding relies on the evidence that women still earn less than men, even working at the same job. However, women had an efficient development over discrimination, offering them women effective legislation, although this factor explains only a little part of the pay gap.DOI: https://doi.org/10.17921/2448-2129.2020v21n1p17-20
Revista de Ciências Jurídicas., v.21, n.1, p. 17-20, 2020