382 research outputs found
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
Βελτίωση του ενεργειακού βαθμού απόδοσης σε υπάρχοντα πλοία με ενεργειακές επιθεωρήσεις και επεξεργασία των σχετικών στοιχείων
No full text144 p.Ο σκοπός αυτής της Διπλωματικής Εργασίας είναι να συμβάλλει στην αναγνώριση μεθόδων και τεχνικών που μπορούν να βελτιώσουν τον ενεργειακό βαθμό απόδοσης των υπαρχόντων πλοίων, λαμβάνοντας υπόψη τα αποτελέσματα των Ενεργειακών Επιθεωρήσεων που διεξήχθησαν σε αυτά από ειδικευμένους μηχανικούς.
Αρχικά, στο πρώτο κεφάλαιο γίνεται μια σύντομη εισαγωγή στα περιβαλλοντικά θέματα που εγείρονται. Το δεύτερο κεφάλαιο περιγράφει το νόημα και την εφαρμογή των δυο κύριων δεικτών επίδοσης που εισήγαγε ο Διεθνής Ναυτιλιακός Οργανισμός (ΙΜΟ). Ο Λειτουργικός Δείκτης Ενεργειακής Απόδοσης (Energy Efficiency Operational Indicator –EEOI) αφορά στα υπάρχοντα πλοία, ενώ ο Σχεδιαστικός Δείκτης Λειτουργικής Απόδοσης (Energy Efficiency Design Index- EEDI) αφορά στα υπό κατασκευή πλοία.
Το τρίτο κεφάλαιο περιέχει μια επισκόπηση μερικών Δυνατοτήτων Εξοικονόμησης Ενέργειας για τα πλοία˙ πολλές από αυτές είναι ήδη ευρέως γνωστές, αλλά δεν έχουν αξιοποιηθεί όσο θα αναμενόταν. Είναι σημαντικό να τονίσουμε ότι με τον όρο ‘’δυνατότητες’’ αναφερόμαστε τόσο σε μηχανισμούς/συσκευές όσο και σε πρακτικές/τεχνικές. Το τέταρτο κεφάλαιο περιγράφει τις βασικές αρχές και το σκοπό του Σχεδίου Αποδοτικής Ενεργειακής Διαχείρισης του Πλοίου(Ship Energy Efficiency Management Plan- SEEMP), το οποίο είναι υποχρεωτικό για όλα τα υπάρχοντα πλοία.
Το πέμπτο κεφάλαιο περιγράφει τις βασικές αρχές και το σκοπό της Ενεργειακής Επιθεώρησης, η οποία διεξάγεται εν πλω από εξουσιοδοτημένους μηχανικούς. Το έκτο κεφάλαιο περιέχει μια Τεχνική Έκθεση Ενεργειακής Επιθεώρησης, η οποία συνετάχθη μετά από σχετική επιθεώρηση το 2012 σε ένα οχηματαγωγό εμπορικό πλοίο.
Το έβδομο και τελευταίο κεφάλαιο της Διπλωματικής Εργασίας, εξετάζει την επίδραση των προτάσεων που διατυπώνονται από την Ενεργειακή Επιθεώρηση, στη βελτίωση της Διαχείρισης Ενέργειας, κάτι που αποτελεί και το στόχο της Διπλωματικής Εργασίας.The objective of this Diploma Thesis is to contribute to the identification of methods and techniques which can improve the Energy Efficiency of existing ships, taking into account the results of Energy Audits performed on them by specialized engineers.
Initially, in the first chapter, a brief introduction is made to the environmental issues raised. The second chapter describes the concept and the application of the two main indicators proposed by the IMO; the one for existing ships, EEOI (Energy Efficiency Operational Indicator), and the one for newbuildings, EEDI (Energy Efficiency Design Index).
The third chapter contains an overview of some Energy Saving Potentials for ships; many of these potentials are widely known, yet not exploited. It is important to note that, by using the term ‘’potentials’’, we refer to both devices and techniques. The fourth chapter describes the basic principles and the purpose of the Ship Energy Efficiency Management Plan, which is mandatory for all existing ships.
The fifth chapter describes the procedure and purpose of the Energy Audit, which is conducted onboard by authorized engineers. The sixth chapter contains an actual Energy Audit Report for a car carrier. The respective Energy Audit was carried out during the year 2012. The seventh and final chapter of this Diploma Thesis, examines the impact of the proposals of the Energy Audit on the improvement of Energy Management of the audited ship.Dimitrios S. Maranti
Dimitrios Mavrokordatos Disproving the Hemostatic Myth of Aqua Binelli
No full text“Aqua Binelli” or “Aqua Balsamica Arterialis” was a hemostatic compound invented by the Italian Fedele Binelli in 1797. Its hemostatic properties were viewed as the solution to treating hemorrhage in cases of wounds and surgical operations. Those who opposed the compound were persuaded of its total lack of effectiveness, supporting the view that hemostasis could be achieved by exerting pressure on, stitching, and ligating a vessel. The publications of Karl Ferdinand von Gräfe, Professor at the University of Berlin and fervent advocate of Aqua Binelli, helped spread the use of the compound in Europe. In 1832, however, one of his students, a young Greek named Dimitrios Mavrokordatos, who became the first Professor of Anatomy and Physiology in the newly established University of Athens in 1837, published in Würzburg his dissertation titled Observations on the Potency of Aqua Binelli (Weitere Nachrichten über das Binellische Wasser), where a completely different picture emerged relating to those applications of the compound that von Gräfe considered successful. The case of Mavrokordatos’ dissertation was a typical 19th-century scientific controversy between a young student and his teacher who enjoyed the support of his associates. Eventually, the myth of the hemostatic activity of Aqua Binelli was debunked. © The Author(s) 2020
Early fatigue damage accumulation of CFRP Cross-Ply laminates considering size and stress level effects
No full textPly-block size and stress level effect on accumulation of transverse cracks and delamination are investigated during early fatigue life of CFRP laminates. Tension-tension fatigue tests under different stress levels were performed for two cross-ply configurations. Edge observation with digital cameras, digital image correlation and acoustic emission were employed for in-situ damage monitoring. Transverse cracks were dominant for [0/902]s laminates with almost non-existent delamination, while different interactive levels between both damage mechanisms occurred for [02/904]s laminates. Poisson's ratio identifies whether early fatigue damage is dominant by transverse cracks or involves delamination. Cumulative AE energy is a helpful indicator of crack density.Structural Integrity & Composite
Two-loop Sudakov form factor in ABJM
No full textThis article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited
Damage accumulation analysis of cfrp cross-ply laminates under different tensile loading rates
No full textThis paper investigates the loading rate effect on both mechanical properties and damage accumulation process of [0°2/90°4]S carbon fiber-polymer laminates under tensile loading. In-situ edge observations, Acoustic Emission and Digital Image Correlation techniques were utilized simultaneously to monitor the state of damage in real time. Results showed that the axial modulus and strength were less sensitive to loading rates than failure strain, which increased with the decrease of the loading rate. In the viewpoint of damage accumulation process, high density and uniform distribution of transverse matrix cracks, and H-shape crack patterns, incorporating inter-laminar cracks, were more likely to occur at low loading rates while variable crack spacing occurred at higher rates. When loading rates were lower than a certain level, maximum transverse matrix crack density decreased slightly due to the restriction of relatively widely generated inter-laminar cracks. Furthermore, the cumulative acoustic emission energy of low-frequency signals was linearly correlated to transverse matrix crack density, providing a promising way to quantify crack accumulation in real time. Finally, spatial consistence was observed between transverse matrix cracks at edges and stress concentrations at the exterior 0° ply, and the peaks of axial strain at local concentration regions locate either near the newest cracks or at the place with minimum crack spacing.Structural Integrity & Composite
Design and implementation of monitoring and evaluation of health care system: The paradigm of primary health care services users in Greece
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T.H. Green on property rights
No full textbook chapterPublished.Darin R. Nesbitt (Douglas College Faculty) contributed the chapter, "T.H. Green on property rights" (1st ed. 2005)
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