821 research outputs found
Babel, or the local distortion of the Greek language
No full textTitle: Βαβυλωνία ἤ ἡ κατά τόπους διαφθορά τῆς ἑλληνικῆς γλώσσας. Κωµωδία (Babel, or the local distortion of the Greek language: A comedy) Originally published: Ναύπλιο (Nafplio), Τυπογραφεῖsο Κωνσταντίνου Τόµπρα ἐκ Κυδωνιῶν καὶ Κωνσταντίνου Ἰωαννίδη ἐκ Σµύρνης, 1836 Language: Greek The excerpt used is from D. C. Vyzantios, Βαβυλωνία, introduction by Spyros Evangelatos (Athens: Εστία, 1993), pp.1–3. About the author Dimitrios Vyzantios (pseudonym of Dimitrios K. Hatziaslanis) [1790, Constantin..
Dimitrios Tsamis Karatasos : a symbol of Greek, Serbian and Bulgarian friendship
No full textTwo Serbian texts extol the contribution of Dimitrios Tsamis Karatasos to the Balkan joint effort to throw off the Ottoman yoke. These texts are analysed by the author within the historical framework of their period, so that the man’s personality and work may be accurately evaluated from a fresh viewpoint. More specifically, the author conducts a research on the tombstone of Dimitrios Tsamis Karatasos, which he discovered himself at Naoussa, and the octet engraved on it, which is also published here. The work is illustrated by seven plates, of which four have not been published previously
The Remains of authoritarianism : bureaucracy and civil society in post-authoritarian Greece
No full textDimitrios A. Sotiropoulos. 30 cm. He presented this paper at a seminar held at the Center on October 21, 1994. - T.p. Includes bibliographical references (p. 31-35
Erratum: Korkovelos, A., et al. The role of open access data in geospatial electrification planning and the achievement of SDG7. An OnSSET-based case study for Malawi. <i>Energies</i> 2019, 12(7), 1395
No full textThe authors wish to make a change in author names (adding new author—Dimitrios Mentis) to this paper
The Exemplary Life of Dimitrios Vikelas (1835-1908)
No full textThis paper describes the "satisfying curve" of Dimitrios Vikelas' life journey, starting from Syros in 1835, moving via Constantinople, Odessa, and Syros again, to London, Paris and finally Athens. It explores Vikelas' multiple aspects, as merchant, writer, traveller, lecturer and essayist, Olympic founder, educationalist, book collector and philanthropist, all of which were united in the public-spirited man of letters (logios). It sets Vikelas in the context of the Greek commercial diaspora, the world of the London expatriate Greek community, and the dynamic society of late nineteenth-century Athens, beginning in the 1870s to act as a magnet to Greek expatriates. The author stresses two qualities of Vikelas: his belief in the idea of a progressive Greek state marked by advances in education, culture, tourism and standards of public life; and the self-awareness and experience which inform his autobiographical writings, not only his memoir My Life but also his last such work, The War of 1897
Turbulence structure and flow resistance in oscillatory boundary layer flows
No full textSubmission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2022-12-01The student, Dimitrios Fytanidis, accepted the attached license on 2020-12-01 at 15:14.The student, Dimitrios Fytanidis, submitted this Dissertation for approval on 2020-12-01 at 15:22.This Dissertation was approved for publication on 2020-12-03 at 08:17.DSpace SAF Submission Ingestion Package generated from Vireo submission #16014 on 2021-03-04 at 16:32:49Made available in DSpace on 2021-03-05T21:45:43Z (GMT). No. of bitstreams: 15
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Previous issue date: 2020-12-03Embargo set by: Seth Robbins for item 117320
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CHARM-F – The Airborne CH4 and CO2 IPDA Lidar: Status and Outlook
No full textCHARM-F (CO2 and CH4 Atmospheric Remote Monitoring - Flugzeug) is DLR’s new airborne Integrated Path Differential Absorption (IPDA) lidar for simultaneous measurements of the column- weighted average dry-air mixing ratios of atmospheric carbon dioxide and methane. It is designed to be flown on board DLR’s new High-Altitude, LOng-range research aircraft, HALO.
Besides water vapor, CO2 and methane are the most important greenhouse gases of the Earth’s atmosphere. However, there is still a lack of knowledge on sources, sinks and the underlying processes of these major GHGs.
One purpose of CHARM-F is to experimentally investigate the feasibility of the IPDA lidar technique to provide a precise method for remote sensing of these two atmospheric trace gases. Furthermore, the system can serve as an airborne demonstrator for future spaceborne applications of this technical approach. In this context, the generation of real-world data can support the development of retrieval algorithms considerably. Not least, operated on HALO it is a powerful tool to investigate scientific topics on CO2 and CH4.
All precursor experiments and the design phase of the instrument are completed. At the moment the system is being set up. First tests are planned for fall 2012
Correction: The effect of COVID rehabilitation for ongoing symptoms Post HOSPitalisation with COVID-19 (PHOSP-R): protocol for a randomised parallel group controlled trial on behalf of the PHOSP consortium (Trials, (2023), 24, 1, (61), 10.1186/s13063-023-07093-7)
No full text\ua9 2023, The Author(s).Following publication of the original article [1], it was noticed that the author name Dimitrios Megaritis was incorrectly written as Dimitrios Magaritis. The author group has been updated above and the original article has been corrected
Aerosol classification using airborne high spectral resolution lidar measurements
No full textWe present an aerosol classification based on high spectral resolution lidar (HSRL) measurements. Intensive aerosol properties measured with the HSRL system are used to differentiate between different aerosol types, characterized by coordinated HSRL and in-situ measurements. Backward trajectories are used to identify possible source regions of the different aerosol types
Comparison and simulation of heat transfer between smooth and non-smooth surface of heat exchangers
No full textΕναλλάκτες θερμότηταςΠερίληψη: Η διπλωματική εργασία εστιάζει στη σύγκριση της θερμικής απόδοσης και της πτώσης πίεσης μεταξύ ενός εναλλάκτη θερμότητας με αυλακώσεις και ενός λείου εναλλάκτη, χρησιμοποιώντας ως βασικές παραμέτρους τον αριθμό Nusselt και την πτώση πίεσης. Οι αυλακώσεις θεωρείται ότι ενισχύουν τη μεταφορά θερμότητας, αυξάνοντας την ανάμειξη του ρευστού και προκαλώντας τυρβώδεις ροές, οι οποίες βελτιώνουν την αποτελεσματικότητα της θερμικής συναγωγής. Ωστόσο, αυτή η ενίσχυση της μεταφοράς θερμότητας συνοδεύεται συνήθως από μεγαλύτερη πτώση πίεσης, κάτι που μπορεί να επηρεάσει την ενεργειακή απόδοση του συστήματος.
Η μελέτη πραγματοποιείται με τη χρήση υπολογιστικής ρευστοδυναμικής (CFD) μέσω του λογισμικού Ansys, το οποίο επιτρέπει την προσομοίωση των ροών ρευστών και της μεταφοράς θερμότητας σε σύνθετες γεωμετρίες. Στην ανάλυση αυτή, εξετάζεται πώς η γεωμετρία των αυλακώσεων επηρεάζει την κατανομή της θερμοκρασίας, την ταχύτητα ροής και την πίεση στο εσωτερικό των εναλλακτών. Τα αποτελέσματα δείχνουν ότι, ενώ οι εναλλάκτες με αυλακώσεις προσφέρουν καλύτερη θερμική απόδοση, αυτό επιτυγχάνεται με το κόστος της υψηλότερης πτώσης πίεσης, γεγονός που μπορεί να απαιτεί μεγαλύτερη ενεργειακή κατανάλωση για την κίνηση του ρευστού.
Τελικός στόχος της εργασίας είναι να προσδιοριστεί ποιος τύπος εναλλάκτη είναι πιο αποδοτικός σε διαφορετικές συνθήκες λειτουργίας, ώστε να ενσωματωθούν βελτιστοποιημένα συστήματα μεταφοράς θερμότητας σε βιομηχανικές και ενεργειακές εφαρμογές, λαμβάνοντας υπόψη την ισορροπία μεταξύ αποδοτικότητας και ενεργειακού κόστους.Summarization: The thesis focuses on comparing the thermal performance and pressure drop between a grooved heat exchanger and a smooth one, using the Nusselt number and pressure drop as key parameters. Grooves are believed to enhance heat transfer by increasing fluid mixing and creating turbulent flows, which improve the efficiency of thermal convection. However, this enhancement in heat transfer is typically accompanied by a higher pressure drop, which can impact the overall energy efficiency of the system.
The study is conducted using computational fluid dynamics (CFD) via the Ansys software, allowing for the simulation of fluid flows and heat transfer in complex geometries. The analysis examines how the grooved geometry affects the distribution of temperature, flow velocity, and pressure within the heat exchangers. The results indicate that while grooved heat exchangers provide better thermal performance, this comes at the cost of increased pressure drop, which may require more energy to maintain fluid flow.
The ultimate goal of the thesis is to determine which type of heat exchanger is more efficient under different operating conditions, providing insights for the optimization of heat transfer systems in industrial and energy applications. The balance between thermal efficiency and energy consumption is a critical factor in determining the best design for various practical uses
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