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1رسالة جامعية
المؤلفون: Kapoulas, Ioannis, Καπούλας, Ιωάννης
مصطلحات موضوعية: Σχεδιασμός αεροσκαφών, Συτήματα μη επανδρωμένων αεροσκαφών, Σταθερής πτέρυγας, Τρισδιάστατη εκτύπωση, Προσομοίωση σε ηλεκτρονικό υπολογιστή, Aircraft design, UAV, Fixed wing, 3d printed, Computer simulation, Επιστήμη Ηλεκτρολόγου Μηχανικού, Ηλεκτρονικού Μηχανικού, Μηχανικού Η/Υ, Επιστήμες Μηχανικού και Τεχνολογία, Υπολογιστές, Υλικό (hardware) και Αρχιτεκτονική, Μηχανική και συστήματα επικοινωνιών, Τηλεπικοινωνίες, Επιστήμη Μηχανολόγου Μηχανικού, Αεροδιαστημική μηχανική, Μηχανολογία, Electrical Engineering, Electronic Engineering, Information Engineering, Engineering and Technology, Computer science, Hardware and Architecture, Communication engineering and systems, Telecommunications, Mechanical Engineering
الوصف: This work represents a multidisciplinary research in the broader mechanical engineering / aeronautical engineering and computer science / telecommunication science fields, which merges the knowledge the author has obtained from the undergraduate programs of Aeronautical Engineering (Psachna, 2021) and Informatics Technology and Telecommunication (Larisa, 2006). This researches’ main objective is to implement a complete design process using computer software, with the furthest result to construct an Unmanned Aerial System (UAS), whose Unmanned Aerial Vehicle (UAV) form a fully 3D printed small fixed wing aircraft named “Euclid”. Traditionally, the main materials used for small UAV’s, such as “Euclid”, were balsa wood, various types of foams, synthetic materials (carbon fiber, glass fiber, Kevlar etc.) or a combination of some or all these materials, depending on the needs of each design. With the rapid spreading of the FDM (Fused Deposition Modelling) 3D printers, some UAV designers, out of Greece, managed to successfully construct fully 3D printed small fixed wing UAV’s in recent years. “Euclid” UAV is the first such 3D printed system, which was designed, constructed, tested, and documented in Greece. This Current study covers all the aspects of the lifecycle of such a system. Specifically, it covers in detail, all three stages of design (conceptual, preliminary, detail), it moves on to flight tests, it gives a detailed documentation of the system in the utilization phase, and finally it provides the online 3DPUAVCalc (3D Printed UAV Calculator) software which helps the designers of similar systems to quickly calculate some aspects of the design process. The methodology used in all stages is based on aviation literature/bibliography and it specializes, where needed, into the special needs of electric propulsion, and/or into the specific needs of a 3D printed UAV. New models and methodologies were developed to cover some of those gaps in the global aviation literature/bibliography such as: the initial sizing of a ...
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2رسالة جامعية
المؤلفون: Tsarsitalidis, Vasileios, Τσαρσιταλίδης, Βασίλειος
مصطلحات موضوعية: Βιομιμητική πρόωση, Παλλόμενα πτερύγια, Μη συμβατική πρόωση, Biomimetic propulsion, Flapping foil propulsion, Flapping wing propulsion, Oscillating wing, Unconventional propulsion, Επιστήμες Μηχανικού και Τεχνολογία, Περιβαλλοντική Μηχανική, Engineering and Technology, Environmental Engineering
الوصف: The present work is oriented to the use of Boundary Element method (UBEM code) on the simulation of biological propulsion systems for the purpose of understanding phenomenae and extracting conclusions which will lead to the design of optimal marine propulsors. The ise of the specific method was chosen, as it can simulate highly unsteady phenomenae (relatively) quickly, as well as produce concentrated information on the simulated phenomenae.More specifically, after a presentation of the state of the art and an introduction of the typical problem of a biomimetic propulsor, the mathematical model of the boundary element method, the numerical implementation and the application in the used software is introducedThen, the investigations made are presented in cases and effects of parameters are discussed, showcasing the results presented in the published works, but also additional results, from which extended series of propulsors that can be used in a manner compatible to the known design methods. The developed Methodology, along with applications on virtual paradigms are compared to conventional propulsors, where the advantage of the systems in hand are shown.Last but not least, newer developments, concerning the application of hydroelasticity, in the manner of spring loaded wings (1 DOF - pitching motion) along with the initial results of systematic investigations of it as well as active control of the pitching motion. The ability to adapt and operate in an envrionment of random motions, shows the potential of the use of such systems as energy saving devices as well. In the conclusions, proposed applications are shown, both for retrofits and newbuilds, while a zero emmisions concept is introduced. ; H παρούσα εργασία προσανατολίζεται στην χρήση της μεθόδου των συνοριακών στοιχείων (κώδικας UBEM) για την προσομοίωση βιολογικών συστημάτων πρόωσης, με στόχο την κατανόηση φαινομένων και την εξαγωγή συμπερασμάτων που θα οδηγήσουν στην σχεδίαση βέλτιστων προωστήρων πλοίου. Η χρήση της συγκεκριμένης μεθόδου ενδείκνυται, ...
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3رسالة جامعية
المؤلفون: Stamatelos, Dimitrios, Σταματέλος, Δημήτριος
مصطلحات موضوعية: Πτέρυγα από σύνθετα υλικά, Πολυάριθμες κύριες δοκούς, Ανάλυση τάσεων, Λυγισμός πλακών με ενισχυτικές δοκούς, Πεπερασμένα στοιχεία, Προκαταρκτικός σχεδιασμός, Μεθοδολογία διαστασιολόγησης, Composite wing, Multispar wing, Stress analysis, Buckling of stiffened panels, Conceptual design, Sizing methodology, Επιστήμες Μηχανικού και Τεχνολογία, Μηχανική Υλικών, Engineering and Technology, Materials Engineering
الوصف: The design and development of a modern aerospace structure consists of many design stages. The most important stages are the conceptual and the preliminary where the initial sizing of the structure is obtained. It is known that the conventional design of the aircraft’s main structural members has reached a high optimization level, where margins for further improvement are small. The current demands of the lightweight structures such as weight reduction, payload increase etc. have led the aerospace industries develop unconventional structures and partially substitute the metallic materials of the primary structures with composites. The current trend of designing and evolving unconventional aerospace structures, without performing extended experimental tests, leads to the development of behavior models. The simulation of the experimental tests (through the behavior models) is achieved using high performance computers and numerical methods (Finite Element Method, Boundary Element Method etc). To apply simulation methods during the conceptual and preliminary stage is not an easy task. Most of the difficulties are the numerous geometrical, material parameters and the structural details that alter during the iterative process of the design. So, the exclusive usage of numerical analysis methods becomes very time consuming, if it is not accompanied by analytical or semi analytical methods of the sub-problems of the design. Part of the preliminary design of an unconventional wing structure is to prevent upper skin from failure. The stiffened panels that comprise the upper skin of the wing suffer from buckling due to the applied compressive loads. The sizing of the composite stiffened panels usually requires numerous of iterative calculations for various geometries, loading and boundary conditions etc. The examination of each case separately, with the use of numerical methods, results to time consuming analyses of the entire structure. Therefore, the development of appropriate analytical or semi analytical methods for ...
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4رسالة جامعية
المؤلفون: Douvi, Eleni, Δουβή, Ελένη
مصطلحات موضوعية: Πειραματική διερεύνηση, Υπολογιστική διερεύνηση, Αεροδυναμική συμπεριφορά, Διφασική ροή, Αεροτομή, Πτέρυγα, Πτερύγιο ανεμοκινητήρα, Αεροδυναμικοί συντελεστές, Experimental study, Computational study, Aerodynamic behavior, Two-phase flow, Airfoill, Wing, Wind turbine blade, Aerodynamic coefficients, Επιστήμες Μηχανικού και Τεχνολογία, Άλλες Επιστήμες Μηχανικού και Τεχνολογίες, Engineering and Technology, Other Engineering and Technologies
الوصف: The aim of the present doctoral thesis is the experimental and computational study of the aerodynamic behavior of wings in two-phase flow and the application on wind turbine blades. First of all, experimental and computational study of one-phase flow over airfoils, wings and wind turbine blade and afterwards study of two-phase flow over the same bodies is conducted. The comparison of the results between dry and wet conditions is necessary in order to show the effects of two-phase flow at the aerodynamic performance.Wind tunnel tests were conducted to show the aerodynamic behavior of airfoils and wings in one-phase and two-phase flows. To simulate two-phase flow, the wind tunnel of the Fluid Mechanics Laboratory has to be configured with adding commercial rain simulated nozzles. For the experiments NACA 0012 airfoils and wings which come along the wind turbine are utilized and airfoil and wings S809 are constructed. The experiments of one-phase flow and two-phase flow are conducted for the same air velocity. For the two-phase flow four different Liquid Water Contents are examined.For the computational analysis the commercial CFD code ANSYS Fluent is used. In first place, simulations of one-phase flow over the NACA 0012 airfoil are done with three different turbulence models. The NACA0012 airfoil is chosen because it has been studied in depth and has a precise data base to compare the results of the simulation with.The lift coefficients are computed with accuracy in contrast to the drag coefficient. The overprediction of drag is expected since the actual airfoil has laminar flow over the forward half. The turbulence models cannot calculate the transition point from laminar to turbulent and consider that the boundary layer is turbulent throughout its length. Therefore, it is necessary to compare the computational results with experimental data of a fully turbulent boundary layer. In order to get more accurate results, the computational domain could be split into two different domains to run mixed laminar and ...
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5رسالة جامعية
المؤلفون: Μουρατίδου, Μαρία
مصطلحات موضوعية: Δροσόφιλα, Τρασγελίνες, RNA παρεμβολή, Μελέτη σάρωσης, Μυϊκό σύστημα, Επιθήλιο φτερού, Μαλπιγγιανά σωληνάρια, Drosophila, Trasgelins, RNA interference, Screen, Muscle system, Wing epithelium, Malpighian tubules, CHD64, Φυσικές Επιστήμες, Βιολογία, Natural Sciences, Biological Sciences
الوصف: In the past years many research groups have focused in the identification ofgenes that are involved in distinct biological processes and Drosophila has providedthe ideal model-organism due to the availability of several genetic tools. Theintroduction of RNAi technology has greatly facilitated the conduction of many largescale genetic analyses in Drosophila. Taking advantage of the available tools weconducted an RNAi-based screen for genes involved in the morphogenesis of thesomatic muscle system and wing epithelium of Drosophila melanogaster.Collectively, we tested 321 genes with either systemic or tissue-specific RNAisilencing in the mesoderm or a combination of both and discovered 58 novel geneswhich are required for proper development and homeostasis of the embryonic/larvalmuscular system. Surprisingly, in almost half of the cases we did not observe a lethalphenotype of complete penetrance arguing that the number of genes involved in theparticular process is greater than the one estimated based on the results of a recentlycompleted genome-wide scale RNAi-based muscle screen. In addition, we tested 242genes by tissue-specific gene inactivation in the epithelia and identified 32 that arerequired for adult viability and 24 that are indispensible for proper adult wingmorphogenesis. Among our positive hits we selected one that is required for bothprocesses for further examination, namely chd64.Chd64 encodes a protein that consists of a calponin-homology (CH) domainand a CLIK23 motif and exhibits 42% and 43% identity with the mammaliantransgelins 2 and 3 respectively. Transgelins comprise a highly conserved family ofproteins that have been implicated in the bundling and stabilization of actin filaments.The Drosophila genome bears three distinct loci: CG4694 or Mp20, CG14996 orChd64 and CG5023 by complete analogy to the mammalian genomes. Our initialresults showed that out of the three genes that code for the fly transgelins only chd64is required for viability and the proper development of muscle and epithelial ...
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6رسالة جامعية
المؤلفون: Vlahostergios, Zinon, Βλαχοστέργιος, Ζήνων
مصطلحات موضوعية: Τυρβώδεις ροές, Ιξώδες τύρβης, Τάσεις Reynolds, Μοντέλα τάσεων Reynolds (RSM), Συμπιεστές ροές, Διηχητικές ροές, Κανονικοποίηση υπολογιστικού χώρου, Αποσύνθεση πεδίου τιμών, Πέρυγα δέλτα, Turbulence, Eddy viscosity, Reynolds stresses, Reynolds stress models, Compressible-transonic flows, Computational space, Domain decomposition, Delta wing, Επιστήμες Μηχανικού και Τεχνολογία, Επιστήμη Μηχανολόγου Μηχανικού, Engineering and Technology, Mechanical Engineering
الوصف: In this PhD thesis new advanced turbulence models, non-linear eddy viscosity models (NLEVM) and Reynolds stress transport models (RSM), are analyzed and incorporated in a new parallel solver for three dimensional flows. Furthermore, a new non-linear eddy viscosity model is derived and developed which is dedicated to transitional flows. The effects of compressibility are also taken into account in order to make the solver and all turbulence models capable of computing compressible transonic flows. Finally, an application of a complex three dimensional flow is presented which concerns the flow development and the vortex breakdown control on the suction surface of a Delta wing with the use of jet-flaps. ; Στην παρούσα διδακτορική διατριβή γίνεται η ανάπτυξη και ενσωμάτωση εξελιγμένων μοντέλων τύρβης (EVM και RSM) σε έναν τρισδιάστατο παραλληλοποιημένο επιλυτή ροής. Τα πολύπλοκα φαινόμενα της στοχαστικής διακύμανσης των μεγεθών της ροής μοντελοποιούνται με τα αναπτυσσόμενα μοντέλα τύρβης, που είναι χαμηλού αριθμού Reynolds (EVM και RSM), ενώ γίνεται έλεγχος της αξιοπιστίας τους και άμεση σύγκριση των προς επίλυση μεταβλητών με διαθέσιμα πειραματικά δεδομένα σε πολυσύνθετες ροές. Παράλληλα, εξάγεται ένα μη-γραμμικό μοντέλο ιξώδους τύρβης που βασίζεται σε βασικές αρχές μοντελοποίησης κυρίως για μεταβατικές ροές. Επίσης, ενσωματώνεται με κατάλληλες μεθοδολογίες και η μεταβολή της πυκνότητας ώστε να είναι δυνατή η εφαρμογή του επιλυτή και στην περιοχή των συμπιεστών ροών. Τέλος, παρουσιάζεται μια εφαρμογή που εξετάζει την ανάπτυξη του πεδίου ροής και τον έλεγχο της αποδόμησης των αναπτυσσόμενων δινών στης επιφάνεια μιας πτέρυγας Δέλτα με έγχυση ρευστού στην ακμή φυγής.
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7رسالة جامعية
المؤلفون: Σταματόπουλος, Δημήτριος
مصطلحات موضوعية: Κληρικαλική πτέρυγα, Μεταρρυθμιστική πτέρυγα, Λαϊκό στοιχείο, Πατριαρχικός συγκεντρωτισμός, Αρχιερατικές επιχορηγήσεις, Οικουμενισμός, Εθνικισμός, Clerical wing, Reformist wing, Laic element, Patriarchal centralization, Prelatic allowances, Ecumenism, Nationalism, Ανθρωπιστικές Επιστήμες και Τέχνες, Humanities and the Arts, Ιστορία και Αρχαιολογία, History and Archaeology
الوصف: Η διδακτορική διατριβή έχει ως στόχο να περιγράψει, να αναλύσει και να ερμηνεύσει τη διαμόρφωση δυό αντίπαλων πτερυγών στα πλαίσια της ελληνορθόδοξης κοινότητας Κωνσταντινουπόλεως, της κληρικαλικής και της μεταρρυθμιστικής, και τον πολιτικοανταγωνισμό, όπως αυτός εκδηλώθηκε κατά την περίοδο 1858 - 1878 με αντικείμενο την εφαρμογή του συνταγματικού κειμένου των γενικών κανονισμών κειμένου που προέκυψε ως αποτέλεσμα των εργασιών της εθνοσυνέλευσης των ετών 1858 - 60. Η ανάλυση έγινε με φόντο τη δεύτερη περίοδο των μεταρρυθμίσεων στην Οθωμανική αυτοκρατορία (τανζιματ) και βασίστηκε σε πρωτογενές αρχιακό υλικό και στη μελέτη της σχετικής ελληνικής και ξένης βιβλιογραφίας. Τα συμπεράσματα της διατριβής μπορούν να συνοψιστούν στα εξής: επισήμανση των συνεπείων της εισόδου των λαϊκών στη διοίκηση του οικομενικού πατριαρχείου, τόσο στη δημιουργία ενός πολιτικού πεδίου που επέτρεψε την αντιπροσώπευση ευρύτερων κοινωνικών κατηγοριών, όσο και στην "εθναρχική" διάσταση του πατριαρχικού θεσμού, εφόσον η μεταρρύθμιση βασίστηκε στη διάκριση "πνευματικών" και "υλικών" αρμοδιοτήτων και στη διαμόρφωση μοντέλων πατριαρχικού συγκεντρωτισμού. Επισήμανση του ρόλου της αποτυχίας εφαρμογής του κανονισμού περί αρχιερατικών επιχορηγήσεων στη γενικότερη πορεία των μεταρρυθμίσεων. Ανάδειξη των σχέσεων του ζητήματος των γενικών κανονισμών με το μοναστηριακό και το βουλγαρικό που οδήγησε στην ανασύνταξη των δυό πτερυγών και στην μετατόπιση της αντιπαράθεσης από το δίπολο "μεταρρύθμιση - συντήρηση" στο αντίστοιχο "οικουμενισμός - εθνικισμός". ; The doctoral dissertation is intended to describe, analyze and interpret the formation of two opposing wings in the Greek Orthodox community of Constantinople: the clerical and the reformist, as well as the political antagonism between them which manifested itself in the period 1858 - 1878, focusing on the implementation of the constitutional text of the " general regulations" a text which emerged from the deliberations of the national assembly in the years 1858 - 1860 the analysis is conducted against ...
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8رسالة جامعية
المؤلفون: Hadjiioannou, Pantelis, Χατζηϊωάννου, Παντελής
مصطلحات موضوعية: Ανώτερο τριτημόριο αποκλίματος, Οπίσθιες κλινοειδείς αποφύσεις, Ράχη τουρκικού εφιππίου, Έσω ακροκόρυφης λιθοειδούς, Ακανθικό τρήμα, Ακρότατο σημείο ελάσσονος πτέρυγος σφηνοειδούς, Κορυφή της βασικής αρτηρίας, Κογχοζυγωματική προσπέλαση, Upper third of clivus, Posterior clinoid processes, Dorsum sellae, Petrous apex, Foramen spinosum, Most lateral point of sphenoidal lesser wing, Tip of basilar artery, Orbitozygomatic approach, Ιατρική και Επιστήμες Υγείας, Βασική Ιατρική, Medical and Health Sciences, Basic Medicine
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9رسالة جامعية
المؤلفون: Ντούνια, Χριστίνα
مصطلحات موضوعية: ΑΡΙΣΤΕΡΟΙ ΛΟΓΟΤΕΧΝΕΣ, ΚΡΙΤΙΚΗ ΛΟΓΟΤΕΧΝΙΚΗ, Λαϊκή παράδοση, Μεσοπόλεμος, Μυθιστόρημα, ΠΕΡΙΟΔΙΚΑ ΛΟΓΟΤΕΧΝΙΚΑ, ΠΡΟΛΕΤΑΡΙΑΚΗ ΤΕΧΝΗ, Σοσιαλιστικός ρεαλισμός, Υπερρεαλισμός, Φουτουρισμός, BETWEEN THE TWO WORLD WARS, Folklore, FOUTOURISM, LEFT-WING WRITERS, Literary critique, LITERARY REVUES, Novel, PROLETARIAN ART, SOCIALISTIC REALISM, Surrealism, Ανθρωπιστικές Επιστήμες και Τέχνες, Γλώσσα και Λογοτεχνία, Humanities and the Arts, Languages and Literature
الوصف: ONE OF THE BASIC AIMS OF THE GREEK CULTURAL SPHERE IN BETWEEN THE TWO WORLD WARS IS THE AIM FOR THE RENEWAL AND THE MODERNIZATION. WITHIN THIS GENERAL FRAMEWORK IS PLACED THE ATTEMPT OF THE GREEK INTELLECTUALS AND AUTHORS TO COMBINE THE RENEWAL OF LITERATURE WITH THE CHANGE OF THE SOCIETY. IT IS AN ENDEAVOUR EXPRESSED MAINLY IN THE SOCIALIST CIRCLES AND MANIFESTED PROMINENTLY IN THE LITERARY REVUES. THE CAREFULL STUDY OF THOSE REVUES -WHICH CONSTITUTE THE BASIC MATERIALOF THIS THESIS- REVEALS TWO PHASES IN THE PROCESS OF FORMATION OF THE CONCEPTIONS RELATIVE TO THE ROLE AND THE FUNCTION OF LITERATURE. THERE IS NO SHARP SEPARATION BETWEEN THESE TWO PHASES: IN GENERAL ONE COULD DEFINE AS THE FIRST PHASETHE ONE CORRESPONDING TO THE TWENTIES, WHILE THE SECOND PHASE APPEARS TO MANIFEST ITSELF, AFTER A RELATIVELY SHORT PERIOD OF TWO YEARS, DURING THE THIRTIES AND CONTINUES UP UNTIL NINETEEN THIRTY SIX. THE TWO OPPOSITE POINTS OF THIS PROCESS ARE, FROM THE ONE SIDE, THE AUTONOMY OF THE LITERARY REVUES AND THE -DECLARED OR LATENT-RECOGNITION OF THE AUTONOMY OF ART AND, FROM THE OTHER SIDE, THE SUBJUGATION OF LITERATURE TO THE PARTY AND TO THE NORMATIVE RULES OF THE DOCTRINE OF SOCIALIST REALISM. ; ΕΝΑ ΑΠΟ ΤΑ ΒΑΣΙΚΑ ΑΙΤΗΜΑΤΑ ΤΟΥ ΕΛΛΗΝΙΚΟΥ ΠΝΕΥΜΑΤΙΚΟΥ ΧΩΡΟΥ ΣΤΟΝ ΜΕΣΟΠΟΛΕΜΟ ΕΙΝΑΙ ΤΟ ΑΙΤΗΜΑ ΤΗΣ ΑΝΑΝΕΩΣΗΣ ΚΑΙ ΤΟΥ ΕΚΣΥΓΧΡΟΝΙΣΜΟΥ. ΜΕΣΑ ΣΤΟ ΓΕΝΙΚΟ ΑΥΤΟ ΠΛΑΙΣΙΟ ΕΝΤΑΣΣΕΤΑΙ Η ΑΠΟΠΕΙΡΑ ΤΩΝ ΕΛΛΗΝΩΝ ΔΙΑΝΟΟΥΜΕΝΩΝ ΚΑΙ ΛΟΓΟΤΕΧΝΩΝ ΝΑ ΣΥΝΔΥΑΣΟΥΝ ΤΗΝΑΝΑΝΕΩΣΗ ΤΗΣ ΛΟΓΟΤΕΧΝΙΑΣ ΜΕ ΤΗΝ ΑΛΛΑΓΗ ΤΗΣ ΚΟΙΝΩΝΙΚΗΣ ΠΡΑΓΜΑΤΙΚΟΤΗΤΑΣ. ΠΡΟΚΕΙΤΑΙ ΓΙΑ ΜΙΑ ΑΠΟΠΕΙΡΑ Η ΟΠΟΙΑ ΕΚΔΗΛΩΝΕΤΑΙ ΣΤΟΥΣ ΣΟΣΙΑΛΙΣΤΙΚΟΥΣ, ΚΥΡΙΩΣ, ΚΥΚΛΟΥΣ ΚΑΙ ΑΝΙΧΝΕΥΕΤΑΙ ΕΥΔΙΑΚΡΙΤΑ ΜΕΣΑ ΣΤΑ ΛΟΓΟΤΕΧΝΙΚΑ ΠΕΡΙΟΔΙΚΑ ΤΗΣ ΑΡΙΣΤΕΡΗΣ ΔΙΑΝΟΗΣΗΣ. Η ΜΕΛΕΤΗ ΤΩΝ ΠΕΡΙΟΔΙΚΩΝ ΑΥΤΩΝ-ΠΟΥ ΑΠΟΤΕΛΟΥΝ ΤΟ ΒΑΣΙΚΟ ΕΡΕΥΝΗΤΙΚΟ ΥΛΙΚΟ ΤΗΣ ΠΑΡΟΥΣΑΣ ΔΙΑΤΡΙΒΗΣ-ΑΠΟΚΑΛΥΠΤΕΙ ΔΥΟ ΦΑΣΕΙΣ ΣΤΗ ΔΙΑΔΙΚΑΣΙΑ ΔΙΑΜΟΡΦΩΣΗΣ ΤΩΝ ΑΝΤΙΛΗΨΕΩΝ ΤΗΣ ΕΛΛΗΝΙΚΗΣ ΑΡΙΣΤΕΡΑΣ ΣΧΕΤΙΚΑ ΜΕ ΤΟ ΡΟΛΟ ΚΑΙ ΤΗ ΛΕΙΤΟΥΡΓΙΑ ΤΗΣ ΛΟΓΟΤΕΧΝΙΑΣ. ΟΙ ΔΥΟ ΑΥΤΕΣ ΦΑΣΕΙΣ ΔΕΝ ΔΙΑΚΡΙΝΟΝΤΑΙ ΑΠΟ ΜΙΑ ΑΥΣΤΗΡΗ ΔΙΑΧΩΡΙΣΤΙΚΗ ΓΡΑΜΜΗ: ΣΧΗΜΑΤΙΚΑ ΘΑ ΟΡΙΖΑΜΕ ΩΣ ΠΡΩΤΗ ΦΑΣΗ ΑΥΤΗ ΠΟΥ ΧΡΟΝΙΚΑ ...
