574 research outputs found
The Δρομοδείχτης της Ελλάδος of 1824 and Athanasios Stageirites (Τίτλος περίληψης)
No full textσ. [281]-290Κείμενο στα ελληνικά με περίληψη στα αγγλικά με τον τίτλο: The Δρομοδείχτης της Ελλάδος of 1824 and Athanasios StageiritesThe article first examines the close relationship between the publication “Δρομοδείχτης της Ελλάδος” [1824] and the publication “Ηπειρωτικά” (1819) by Athanasios Stageirites and then suggests that Athanasios Stageirites is the likeliest author of the “Δρομοδείχτης της Ελλάδος”.Δωδώνη: Τεύχος Πρώτο: επιστημονική επετηρίδα του Τμήματος Ιστορίας και Αρχαιολογίας της Φιλοσοφικής Σχολής του Πανεπιστημίου Ιωαννίνων; Τόμ. 43-44 (2014-2015
Dataset in support of the Southampton doctoral thesis 'The boatbuilding tradition of the Aegean during the Late Neolithic – Early Bronze Age periods. Typological classification, digital reconstruction and seakeeping assessment'
No full textDataset in support of the Southampton doctoral thesis 'The boatbuilding tradition of the Aegean during the Late Neolithic – Early Bronze Age periods. Typological classification, digital reconstruction and seakeeping assessment' Appendix D - Resistance data and Appendix C - Stability data.
This dataset is focused on two appendices:
Appendix D - Resistance data. D.1 Resistance data produced by the author via MAXSURF Resistance for this thesis.
Appendix C - Stability data
C1. Stability data – STIX and ISO criteria, produced by the author via MAXSURF Stability software for his thesis
This research was funded by Southampton Marine and Maritime Institute (SMMI), Vice-Chancellor's Scholarship, Greek Archaeological Committee UK (GACUK)
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CALIPSO Overpasses During Three Atmospheric Pollen Events Detected by Hirst-Type Volumetric Samplers in Two Urban Cities in Greece
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CALIPSO Overpasses During Three Atmospheric Pollen Events Detected by Hirst-Type Volumetric Samplers in Two Urban Cities in Greece
by Archontoula Karageorgopoulou 1,*,Elina Giannakaki 1ORCID,Christos Stathopoulos 1,Thanasis Georgiou 2ORCID,Eleni Marinou 2ORCID,Vassilis Amiridis 2ORCID,Ioanna Pyrri 3ORCID,Maria-Christina Gatou 1,Xiaoxia Shang 4ORCID,Athanasios Charalampopoulos 5,Despoina Vokou 5 andAthanasios Damialis 5ORCID
1
Department of Environmental Physics and Meteorology, Faculty of Physics, University of Athens, 15784 Athens, Greece
2
Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, 15236 Athens, Greece
3
Department of Ecology and Systematics, Faculty of Biology, University of Athens, 15784 Athens, Greece
4
Finnish Meteorological Institute, Atmospheric Research Centre of Eastern Finland, 70211 Kuopio, Finland
5
Department of Ecology, School of Biology, Faculty of Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
*
Author to whom correspondence should be addressed.
Atmosphere 2025, 16(3), 317; https://doi.org/10.3390/atmos16030317
Submission received: 24 January 2025 / Revised: 24 February 2025 / Accepted: 5 March 2025 / Published: 10 March 2025
(This article belongs to the Special Issue Development of LIDAR Techniques for Atmospheric Remote Sensing (2nd Edition))
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Abstract
Vertically retrieved optical properties by Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) were investigated in the case of three selected events over Athens and Thessaloniki with documented high pollen concentrations. Hirst-type volumetric samplers were used to detect and characterize the pollen during the CALIPSO overpasses. Only cases with a total pollen concentration greater than 400 grains m−3 for at least two hours per day were considered severe pollen events, while model simulations were used to exclude the presence of other depolarizing aerosol types. This study provides mean values of lidar-derived optical properties inside the detected pollen layers; i.e., optical values represent the atmosphere with the presence of pollen, in urban cities of Greece. Specifically, three observed aerosol layers, one over Athens and two over Thessaloniki with particulate color ratios of 0.652 ± 0.194, 0.638 ± 0.362, and 0.456 ± 0.284, and depolarization ratios of 8.70 ± 6.26%, 28.30 ± 14.16%, and 8.96 ± 6.87%, respectively, were misclassified by CALIPSO as marine-dusty marine, dust, and polluted dust. In cases of intense pollen presence, CALIPSO vertical profiles and aerobiological monitoring methods may be used synergistically to better characterize the atmospheric pollen layers
Peak power reduction algorithms in asymmetric digital subscriber line modems
No full textThesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.Includes bibliographical references (leaves 94-96).This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.This thesis investigates peak-to-average ratio (PAR) reduction techniques for multicarrier modulation systems, such as discrete multitone (DMT) modems and orthogonal frequency-division multiplexed (OFDM) terrestrial broadcast transmitters. Through simulation and test implementation on a state-of-the-art programmable ADSL development platform, this thesis pursues a suitable solution for minimizing PAR given the resources of a programmable platform. This solution is integrated as a prototype implementation into a fully-functional ADSL modem and optimized for maximum PAR reduction performance within modem complexity constraints.by Athanasios Dimitri Dousis.M.Eng
Pollen-scapes in natural and urban environments: production and atmospheric circulation of pollen grains at different heights and elevations
No full textAirborne pollen research can provide information about the quality of the atmospheric environment and vegetation, but also can contribute to take prevention measurements concerning public health, since pollen grains can provoke allergic symptoms. In the present thesis the three-factor complex: ‘vegetation that produces pollen’ – ‘pollen produced’ – ‘airborne pollen’ was investigated. More precisely, the atmospheric pollen load was recorded in several areas of Thessaloniki, differing spatial-wise either horizontally or vertically, using a portable and a stable volumetric sampler, pollen production was estimated for anemophilous woody species in stations differing in elevation and/or exposure and the pollen-vegetation relationship was examined within the urban (Thessaloniki) and the natural environment (Mt Olympos National Park). Spatial differences were found for the pollen concentrations recorded in the several areas close to the ground level and at different heights. At the scale of a building (~ 30 m), pollen concentrations were almost three times higher than those recorded at breast height (1.5 m), whilst on a single mountain, species richness of representing taxa and airborne pollen concentrations reduce as elevation increases. Nonetheless, the same high-concentration taxa were found in both environment types, urban and natural, but with differences in their abundance and ranking. The duration of pollen season becomes shorter when transitioning from the natural to the urban environment and from low to high elevations. Pollen production varies between species, especially at the small scales (per flower, per inflorescence) and between years, for most of them. But in greater scales (per crown size, per individual) pollen production is similar for the species belonging to the same genus. Generally, pollen production per individual, for the studied species, ranges from 108 to 1011. Local vegetation governs the local atmospheric pollen load and for the main pollen taxa with woody representatives within the city of Thessaloniki (Cupressaceae, Olea, Pinaceae, Platanus, Ulmus) pollen-vegetation relationship was quantified, which allows forecasting of changes in airborne pollen abundance when vegetation abundance is known and vice versa. Thessaloniki can be considered to be of mild severity when it comes to allergy risk induced by airborne pollen. The taxa with the highest contribution of allergenic pollen are Cupressaceae, Olea, Pinaceae, Platanus, Quercus, Urticaceae. According to all the above, planning of urban green spaces in Thessaloniki, as well as in other cities, should be conducted taking into consideration the factor ‘allergies’. Thus, planting of highly invasive species or species with highly allergenic pollen should be avoided, more so when airborne pollen is already at high concentrations. At the same time, installation of more samplers within a city is necessary, so that areas with different pollen load and vegetation are covered and more precise information about local atmospheric environment is provided. Supplementarily and towards the same scope, it is of utmost importance to conduct modern research on the city’s population sensitivity to the pollen grains that circulate in the city’s atmosphere.Η μελέτη της αερομεταφερόμενης γύρης παρέχει περιβαλλοντική πληροφορία για την ποιότητα του ατμοσφαιρικού περιβάλλοντος και την κατάσταση της βλάστησης, αλλά συμβάλλει και στην πρόληψη για τη δημόσια υγεία, καθώς η γύρη είναι πρόξενος αλλεργικών συμπτωμάτων. Στην παρούσα διατριβή διερευνήθηκε το τρίπτυχο: ‘βλάστηση που παράγει γύρη’ – ‘γύρη που παράγεται’ – ‘γύρη που μεταφέρεται στην ατμόσφαιρα’. Πιο συγκεκριμένα, σε διαφορετικές περιοχές του αστικού συγκροτήματος της Θεσσαλονίκης, τόσο στο ίδιο επίπεδο όσο και καθ’ ύψος, καταγράφηκε το ατμοσφαιρικό φορτίο γυρεοκόκκων με σταθερό και φορητό ογκομετρικό συλλέκτη, εκτιμήθηκε η γυρεοπαραγωγή ανεμόφιλων ξυλωδών ειδών σε περιοχές διαφορετικής έκθεσης ή/και υψομέτρου και αναζητήθηκαν οι σχέσεις γύρης-βλάστησης στο αστικό (Θεσσαλονίκη) και στο φυσικό (Εθνικό Πάρκο Ολύμπου) περιβάλλον. Παρατηρήθηκε ότι οι συγκεντρώσεις διαφοροποιούνται χωρικά, τόσο σε οριζόντιο επίπεδο όσο και καθ’ ύψος. Στην κλίμακα ενός ψηλού κτηρίου (~30 m), οι συγκεντρώσεις είναι περίπου τριπλάσιες χαμηλά (1,5 m) σε σχέση με ψηλά, ενώ στην κλίμακα ενός ψηλού βουνού, ο πλούτος των εκπροσωπούμενων taxa και οι συγκεντρώσεις αερομεταφερόμενης γύρης μειώνονται κατά τη μετάβαση από τα χαμηλά στα μεγάλα υψόμετρα. Παρά ταύτα, τα ίδια αφθονότερα taxa καταγράφονται και στο αστικό και στο φυσικό περιβάλλον, αλλά με διαφορετικές αφθονίες και σειρά κατάταξης. Η συνολική διάρκεια της περιόδου κυκλοφορίας γύρης μειώνεται κατά τη μετάβαση από το αστικό στο φυσικό περιβάλλον και από τα χαμηλά στα μεγάλα υψόμετρα. Η παραγωγή γύρης ποικίλει έντονα από είδος σε είδος κυρίως σε μικρές κλίμακες ανάλυσης (επίπεδο άνθους, ταξιανθίας) και από έτος σε έτος για την πλειοψηφία των taxa. Όμως, σε μεγαλύτερες κλίμακες (επίπεδο μονάδας κόμης ή ατόμου) για τα είδη του ίδιου γένους, οι τιμές είναι ανάλογες. Γενικότερα, στο επίπεδο ατόμου, η παραγωγή των ειδών που μελετήθηκαν κυμαίνεται κατά μέσο όρο μεταξύ 108 έως 1011. Η τοπική βλάστηση υπερκαθορίζει το τοπικό ατμοσφαιρικό φορτίο γύρης και για τα κυρίαρχα taxa γύρης με ξυλώδεις εκπροσώπους στην πόλη (Cupressaceae, Olea, Pinaceae, Platanus, Ulmus) ποσοτικοποιήθηκε η σχέση αερομεταφερόμενης γύρης και αφθονίας των φυτών που τα παράγουν, γεγονός που επιτρέπει προβλέψεις για αλλαγές στη γύρη όταν είναι γνωστή η αφθονία των φυτών και αντίστροφα. Η Θεσσαλονίκη μπορεί να χαρακτηριστεί ως ήπιου κινδύνου σε σχέση με την αερομεταφερόμενη γύρη και τις επιπτώσεις στην υγεία, ενώ η επιβάρυνση είναι μεγαλύτερη από τη γύρη των εκπροσώπων των Cupressaceae, Olea, Pinaceae, Platanus, Quercus, Urticaceae. Με βάση τα ανωτέρω ευρήματα, για το σχεδιασμό των χώρων πρασίνου στη Θεσσαλονίκη, αλλά και στις άλλες πόλεις, θα πρέπει να λαμβάνεται υπόψη ο παράγοντας ‘αλλεργίες’ και να αποφεύγεται η φύτευση όπως και να ελέγχεται η εξάπλωση εισβολικών-επεκτατικών ειδών με έντονη αλλεργιογόνο δράση, πολύ περισσότερο όταν η συγκέντρωση της αερομεταφερόμενης γύρης τους έχει φθάσει σε υψηλά επίπεδα. Παράλληλα, είναι απαραίτητη η τοποθέτηση περισσότερων του ενός συλλεκτών σε μια πόλη, ώστε να καλύπτονται περιοχές που διαφέρουν έντονα μεταξύ τους και να παρέχονται ακριβέστερες πληροφορίες για την ποιότητα του ατμοσφαιρικού περιβάλλοντος τοπικά. Tαυτόχρονα, είναι σημαντική η διεξαγωγή σύγχρονων μελετών για την ευαισθησία του πληθυσμού της πόλης, στη γύρη που κυκλοφορεί σε αυτήν
Homophobic Statements, a Bishop, and the Limits of Freedom of Expression. An In-Depth Commentary on ECtHR 31.08.2023, Amvrosios-Athanasios Lenis v. Greece, no. 47833/20
No full textDichiarazioni omofobe, un vescovo e i limiti della libertà di espressione. Un commento approfondito su CEDU 31.08.2023, Amvrosios-Athanasios Lenis v. Greece, no. 47833/20.
ABSTRACT: The decision of the ECtHR of 31.08.2023, Amvrosios-Athanasios Lenis v. Greece (no. 47833/20), is a further step toward an increasingly dense jurisprudence on “hate speech” and the limits of freedom of expression. The public proclamation of religious doctrines that are in conflict with the values of the contracting States enshrined in the ECHR is protected to a certain extent by the fundamental right of freedom of religion and belief. However, the qualification of a statement as religious does not justify “hate speech.” The AUTHOR shows the tension between freedom of religion, freedom of expression, and protection against discrimination, and analyzes the decision against the backdrop of Article 17 of the ECHR (prohibition of abuse of rights).
SOMMARIO: 1. Preliminary Remarks - 2. The Concept of Hate Speech - 3. The Facts of the Case - 4. The Procedure and Reasoning of the Court - 4.1 The ECtHR’s Preliminary Considerations on Fundamental Rights - 4.2 Legal assessment - 4.3 Some Remarks on (the Non-Invoked) Article 9 of the ECHR - 5. Concluding Remarks
Bioaerosols in Urban Settings: Roles of Climate Change, Ecosystem Services and Human Health
No full textUrban environments constitute of spaces in which the majority of humankind reside, work and recreate [...
La tomba III di Haghios Athanasios e il valore semantico dell'incarnato
No full textThe tomb III at Haghios Athanasios stands out among the Macedonian tombs for the exceptional painted decoration of the temple-like façade. Excavated in the '90s by M. Tsimbidou-Avloniti it has been published by the scholar in full detail and the iconographic program of the monument has been the object of many publications. This article re-examines the different ways of reproducing the skin color (το ανδρείκελον) in the figures of the miniature frieze and in the megalographic figures beside the door. The realistic rendering of the megalographic figures of armed men in Macedonian attire, showing their sorrow for the lost of an etairos, is contrasting with the pale color of the participants to the symposion in the frieze above the door, a scene whose illusionistic overtone has been yet perceived by the critics. This symposion is articulated in three scenes and it can be interpeted as a necrodeipnon, but in the same time as a celebration of the Macedonian banquet style, centered on the royal court. The author suggests that the first figure on the right of the frieze, related to the group of armed men looking towards the banqueters feasting in the center of the frieze, can be read as the dead himself, for the particular rendering of his ανδρείκελον, showing the typical ochròtes or necròdes face color, according to the contemporary medical lexicon. The pathetic stance assumed by the same figure, the sole in the group which is not bearing arms, seems to confirm his role in the context of the scene
Emerging pharmaceutical therapies in cardiopulmonary resuscitation and post-resuscitation syndrome
No full textComputational Modelling of Compaction in Asphaltic Mixtures and Geomaterials
No full textAsphaltic mixtures are heterogeneous composite materials consisting of aggregates coated and bound by asphalt binder. The long term performance of asphaltic pavements is highly dependent on the mechanical behaviour of the asphaltic mixture during construction (mixing and compaction) and operation; inadequate mixture compaction leads to faster moisture and oxygen diffusion, ravelling, rutting and poor fatigue life
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