Publications by Year: Forthcoming

We construct local coordinates for the Weinstein groupoid of a non-integrable Lie algebroid. To this end, we reformulate the notion of bi-submersion in a completely algebraic way and prove the existence of bi-submersions as such for the Weinstein groupoid. This implies that a C*-algebra can be attached to every Lie algebroid.

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This study presents the comprehensive three-dimensional documentation of two ancient metallurgical galleries at Agios Sostis, on the island of Sifnos, Western Cyclades (Greece). Sifnos has long been a significant center of mining activity, with evidence dating back to the late 4th millennium BC. Its basement rocks are rich in mineral deposits, including argentiferous lead, copper, iron, and zinc resources that played a catalytic role from prehistoric times. The exploitation of these metalliferous deposits, one of the key stages in the transition from the Stone Age to the Bronze Age, contributed significantly to the islands cultural development.Data acquisition was performed using high-resolution terrestrial laser scanning from multiple fixed positions within each gallery, complemented by handheld laser scanning to capture narrow and irregular sections. Topographic control was ensured through the establishment of numerous Ground Control Points (GCPs), enabling high spatial accuracy. The surface topography above the galleries and the adjacent slag mounds was documented using photogrammetric processing of imagery collected via Unmanned Aerial Systems (UAS), producing orthoimages with ground sampling distances of 4.18 cm and 1.62 cm.The interior laser scanning datasets, comprising over 500 million georeferenced 3D points, were processed into dense point clouds and further transformed into high-resolution digital terrain models and textured meshes using specialized software and a structured methodology. By integrating subsurface and surface data, overburden thicknesses ranging from 5.2 m to 66.8 m were calculated, and the volumetric estimation of metallurgical slag deposits was determined to be approximately 4,914 m³.This Digital Twin approach underscores the potential of advanced geospatial techniques for the documentation and protection of vulnerable archaeological heritage. It offers a transferable and scalable framework for similar fragile environments.

Ο συλλογικός αυτός τόμος επιχειρεί να χαρτογραφήσει το ιδιαίτερα θολό ακόμη ιστορικό τοπίο των πανεπιστημιακών εδρών ξένων φιλολογιών και να φέρει στο φως πολλές μέχρι σήμερα άγνωστες πτυχές της ακαδημαϊκής ιστορίας των ξένων φιλολογιών στην Ελλάδα. Εστιάζει ειδικότερα στη λειτουργία των εδρών της γαλλικής, γερμανικής και αγγλικής φιλολογίας, από την περίοδο του Μεσοπολέμου, όταν πρωτοθεσμοθετήθηκαν, μέχρι και τη δεκαετία του 1970, όταν ολοκληρώθηκε η μετάβαση προς έναν νέο θεσμό, τα πανεπιστημιακά τμήματα, και για την τελευταία χρονολογικά από τις εξεταζόμενες ξένες φιλολογίες. Περιλαμβάνει εισαγωγή και τέσσερις πρωτότυπες μελέτες που βασίζονται στη συστηματική αξιοποίηση ανεξερεύνητου αρχειακού υλικού (ξένα και ελληνικά αρχεία) από ερευνητές που ειδικεύονται στο συγκεκριμένο επιστημονικό πεδίο. Για καθεμιά από τις τρεις παραπάνω φιλολογίες αφιερώνεται ένα χωριστό κεφάλαιο, όπου διερευνάται ο ρόλος που έπαιξαν οι ξένοι πολιτιστικοί εταίροι της Ελλάδας στη σύσταση, τη στελέχωση αλλά και γενικότερα τη λειτουργία των πανεπιστημιακών αυτών εδρών. Αντιστοίχως, εξετάζονται και οι θέσεις των ελληνικών ανώτατων ιδρυμάτων σε σχέση με το ζήτημα της διδασκαλίας των ξένων φιλολογιών στο πανεπιστήμιο. Προσκομίζονται επίσης στοιχεία που αφορούν στο διδακτικό προσωπικό και στις ιδιαιτερότητές του (αλλοδαποί φιλόλογοι ή/και καθηγητές ξένων πανεπιστημίων), στις διαλέξεις που τα μέλη του έδιναν στα αμφιθέατρα του ιδρύματος και στη σύσταση του ακροατηρίου τους. Σε ένα τελευταίο κεφάλαιο, επιχειρείται μια σύνθεση της ιστορίας αυτής, μέσω μιας συγκριτικής προσέγγισης που εντοπίζει τις συγκλίσεις και τις αποκλίσεις, έτσι όπως αυτές καταγράφονται κατά την ιστορική διαδρομή των θεσμών αυτών.

Big data and big data analytics will unavoidably change the role of accountants. This paper considers the impact of big data on accounting and auditing. Financial accountants need to move beyond the book-keeping process and become key information providers to decision-makers. That upturns accountants’ consulting role and their ability to think strategically, providing critical help in management decision making. The relationship between managers and management accountants becomes closer and more effective because of big data. Management accountants can use additional analytical methods to detect processes and product excellence, combined with diminishing cost. Big data and big data analytics in auditing ensure audit quality and fraud detection. Upgraded information systems and automation in business procedures diminish the need for staff participation. Inevitably, the skills of accountants and knowledge must be associated with big data and big data analytics and modern accountants must develop an analytics mindset by being familiar with data and technologies.

The Komolithoi badlands, located in the Kissamos providence of Chania, Crete (Greece), are dunes consisting of soft clay that form conic shapes and represent a visually striking and geomorphologically active landscape, shaped by intense erosional processes characteristic of Mediterranean semi-arid environments. Their study can offer insights into the processes and mechanisms of erosion since due to their unique rock properties, including their high clay content, low organic matter, and low infiltration capacity, they are exceptionally vulnerable to erosion. Capturing the complexity and evolution of such landforms requires high-resolution, georeferenced data and a flexible methodological framework adapted to this challenging terrain.In this study, we combine Unmanned Aerial Systems (UAS) and Terrestrial Laser Scanning (TLS) data to generate ultra-detailed 3D models of the Komolithoi formations. Two full surveys were conducted in 2023 and 2024, enabling the construction of multitemporal point clouds. The integration of aerial and terrestrial methods enables dense, accurate surface coverage, overcoming limitations posed by occlusions, steep gradients, and fine-scale roughness. The resulting point clouds achieve high spatial resolution and geolocation precision, offering valuable insights into both surface morphology and potential erosion pathways. In addition to forming a baseline for future monitoring, the datasets allow for preliminary assessment of geomorphic dynamics and sediment redistribution.This contribution emphasizes the methodological potential of combining UAS and TLS technologies for badland research. It highlights how modern geomatics can advance the study of erosional landscapes where traditional surveying methods may fall short. Ultimately, this work contributes to the development of standardized, high-accuracy protocols for mapping and modeling badlands, aligning with broader efforts to monitor landscape change and aid land management in sensitive geomorphic environments.

The present study investigates the alterations of the coastal area of the Acheloos’ deltaic complex (E. Greece) for the last 20 ka and the shoreline response to the anticipated sea level rise, according to various sea-level rise prediction scenarios. The distant and near past were reconstructed through the interpretation of seismic data, sediment cores and historical aerial imagery, while the future state was evaluated considering the IPCC sea-level rise projections, adapted to the specific geomorphological and sedimentological characteristics of the study area. The results indicate a significant alteration of the area throughout the Holocene, primarily driven by the constant sea level fluctuation, while for the recent past, severe erosion has been observed in the entire study area, in places reaching 250 m (~3.4 m/yr) for the past 75 years. The IPCC predictions for 2100 suggest a continuous reduction of the delta, by 10% to 20% of the present area, while considering the most extreme climatic scenario, the percentage of the lost area could reach up to 60% of the total deltaic plain. Regardless of the prevailing scenario, it was estimated that for each 0.1 m of sea-level rise, the average land loss at the deltaic area is approximately 2.8 km2.

Du voyageur-photographe, qui sélectionne ses sujets parmi les gens du pays, au voyageur-collectionneur, qui visite les ateliers commerciaux pour acheter des épreuves, le voyage fut à l’origine d’une production photographique orientaliste diversifiée qui ne fut pas constituée comme un genre autonome, mais se situa à la frontière de plusieurs catégories. Inspirés d’une iconographie stéréotypée déjà en vogue, les photographes commerciaux photographièrent les types ethniques et religieux orientaux et en racontèrent, de manière discontinue, la vie quotidienne, les mœurs et les coutumes ainsi que les activités professionnelles. Dans des conditions souvent difficiles, les voyageurs représentèrent aussi l’Autre oriental. Plusieurs voyageurs gardèrent son image comme souvenir, tandis que d’autres exécutèrent des photographies à caractère anthropologique ou ethnographique. Nombreuses sont aussi les photographies qui rappellent le caractère religieux de l’Orient et montrent l’activité missionnaire. Conçues dans un autre esprit, les photographies des touristes reproduisent une image vivante bien que parfois stéréotypée des Orientaux. Quoique morcelée, l’image des Orientaux formée par les photographies des voyageurs, contribua à la formation de l’identité de l’Oriental. Révélatrice de leur idéologie, leur production, qui s’inscrit dans le contexte de l’orientalisme dénoncé par Edward Saïd, transmet des informations sur la manière dont ils l’avaient perçu. Médiateurs culturels, les photographes français, voyageurs ou résidents, familiarisèrent la population orientale avec l’art de la photographie.  

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The current study focuses on earnings management as a significant determinant of the sticky cost phenomenon, for explaining both firm-level cost behaviour and cross-country differences in cost behaviour. We combine firm-level incentives to manipulate earnings with country-level differences in earnings management practices to provide a richer understanding of the effects of these practices to cost stickiness. Using a sample of G-7 countries (France, Germany, Italy, Japan, Canada, UK and USA) we find that cost stickiness is mitigated in the pervasiveness of earnings management.

If we wish to formulate an axiomatic truth-theory interpreting a modal language and treat the symbol of necessity as a sentential operator and not as a quantifier over possible worlds, there arise various problems. These are due partly to the fact that words could have meant something other than what they actually mean and partly to certain principles of modal metaphysics. One of those principles is existentialism about propositions: a proposition that is expressed in a sentence containing a non-empty name could not exist if the referent of the name did not exist. The paper explains how the problems arise. It also explains how we can avoid them using substitutional quantification in the metalanguage. The truth-theory we can construct in that way is compositional and homophonic, and its theorems interpreting the various sentences of the modal language are derived in a straightforward way. The paper develops one such theory for a propositional modal language and one for a first-order modal language. The first-order case involves a number of intricacies that are discussed.

The Amynteo mega-landslide in northern Greece represents one of the most significant mass-wasting events in southeastern Europe in recent decades, with substantial geomorphological, geotechnical, and socio-economic impacts, causing the relocation of an entire village (Anargiri). Understanding such large-scale slope failure requires a multi-scale and multitemporal approach that captures both the surface dynamics and underlying controlling processes. This study investigates pre- and post-failure surface motion associated with the event by integrating Earth Observation (EO) data and Unmanned Aerial System (UAS) surveys. Surface motion gradients extending from the mine toward the nearby village of Anargyri were assessed using multi-temporal SAR interferometry (MT-InSAR) and offset tracking techniques, together with high-resolution UAS-derived Digital Surface Models (DSMs) and orthophotos. We examined the limits of each technique in measuring surface motion and exploited their complementarities across multiple spatial and temporal scales. Multi-sensor SAR datasets, including Copernicus Sentinel-1 and TerraSAR-X, were processed using MT-InSAR, supported by Copernicus EGMS products and the SNAPPING online service. Offset tracking contributed insights in areas with high displacement gradients where phase decorrelation limited interferometric methods. Repeated UAS campaigns further enhanced spatial interpretation and deformation quantification. Our analysis indicated persistent ground deformation in the pre-failure phase, spatial variability in displacement rates, and post-failure reactivation zones. The integration of InSAR and UAS photogrammetry links geomorphic process domains, such as headscarp retreat, lateral spreading, and toe bulging, with slope kinematics. We also investigate how hydrological forcing, mining-related disturbances, and lithological controls contribute to the triggering of the landslide. The study highlights the spatial and temporal dynamics of the Amynteo landslide and demonstrates the value of integrating diverse EO and UAS techniques for advancing landslide geomorphology and hazard assessment in complex slope systems. This multi-scale, multitemporal monitoring approach enhances the early detection of instability and supports the development of early warning strategies in mining environments.

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Η μελέτη, η οποία βασίζεται σε τεκμηριωτικό υλικό που συγκεντρώθηκε από τα αρχειακά κέντρα των Υπουργείων εξωτερικών της Ελλάδας και της Γαλλίας, του Πανεπιστημίου Αθηνών και της Φιλοσοφικής Σχολής Αθηνών, αποπειράται να ανασυστήσει την ιστορία της πανεπιστημιακής έδρας γαλλικής φιλολογίας από την πρώτη, χρονολογικά, σχετική θεσμική υλοποίηση του 1933 μέχρι τη δημιουργία πανεπιστημιακών τμημάτων γαλλικών σπουδών, κατά την πρώτη μεταπολεμική δεκαετία. Επιχειρεί επίσης να δείξει πως ο πανεπιστημιακός αυτός θεσμός δεν συνδιαλέγεται μόνο με την ελληνική εκπαιδευτική και πολιτική συγκυρία: η ανάμειξη γαλλικών πολιτιστικών ιδρυμάτων επιβάλλει τη διεύρυνση του πεδίου παρατήρησης και σε εκείνο της πολιτιστικής διπλωματίας προκειμένου να φωτιστούν πληρέστερα όψεις που εν τέλει συνδιαμορφώνουν τη φυσιογνωμία του. Ο προβληματισμός επικεντρώνεται, καταρχάς, στις πολιτικές συνεργασίας των εμπλεκόμενων γαλλικών και ελληνικών εκπαιδευτικών ιδρυμάτων για την προώθηση του ζητήματος ή, αντίθετα, στις στρατηγικές που χρησιμοποιήθηκαν με στόχο την εγκατάλειψη αυτού του θεσμικού εγχειρήματος. Διερευνώνται, επίσης, τα δομικά χαρακτηριστικά σε επίπεδο στόχων, προσανατολισμού και οργάνωσης του θεσμού, τα οποία είναι άμεσα συναρτημένα με τις επιδιώξεις των συμβαλλόμενων μερών. Στο πλαίσιο αυτό, ερμηνευτικά σχήματα, όπως το μεταβαλλόμενο από τη συνεργασία στην αντιπαλότητα και από την εξάρτηση στην αυτονόμηση πλέγμα σχέσεων, επιτρέπουν τη βαθύτερη κατανόηση των θεσμικών κατακτήσεων ή/και αντιστάσεων.