365 research outputs found
Panos Valavanis, Hysplex. The Starting Mechanism in Ancient Stadia. A Contribution to Ancient Greek Technology
No full textVanhove Doris. Panos Valavanis, Hysplex. The Starting Mechanism in Ancient Stadia. A Contribution to Ancient Greek Technology. In: L'antiquité classique, Tome 70, 2001. pp. 402-403
Panos Valavanis, Hysplex. The Starting Mechanism in Ancient Stadia. A Contribution to Ancient Greek Technology
No full textVanhove Doris. Panos Valavanis, Hysplex. The Starting Mechanism in Ancient Stadia. A Contribution to Ancient Greek Technology. In: L'antiquité classique, Tome 70, 2001. pp. 402-403
1. Valavanis (Panos), Games and Sanctuaries in Ancient Greece : Olympia, Delphi, Isthmia, Nemea, Athens
No full textMaffre Jean-Jacques. 1. Valavanis (Panos), Games and Sanctuaries in Ancient Greece : Olympia, Delphi, Isthmia, Nemea, Athens. In: Revue des Études Grecques, tome 119, Janvier-juin 2006. pp. 446-447
Deux acropoles antiques sur les montagnes de Galaxidi
No full textΣτις κορυφές των λόφων ΝΔ του Γαλαξιδίου σώζονται σε καλή κατάσταση τα λείψανα δύο οχυρώσεων με ενδιαφέροντα οικοδομικά χαρακτηριστικά, που εκτός από τον καμπύλο περίβολο, διαθέτουν και μακρό τείχος, το οποίο κλείνει σημαντικούς δρόμους-περάσματα της περιοχής. Η πρώτη, στο Κεφαλάρι, είναι μια τυπική προϊστορική ακρόπολη, που μάλλον χρονολογείται στα Μυκηναϊκά χρόνια, παρόλο που στην περιοχή υπάρχει και παλιότερη κεραμική. Η δεύτερη, στον Άγιο Αθανάσιο, έχει μυκηναϊκό πρόδομο αλλά ανοικοδομείται στην ύστερη Γεωμετρική περίοδο, συγχρόνως με ανεσκαμμένο κοντινό νεκροταφείο. Η καλή διατήρηση του περιβόλου και του μακρού τείχους, καθώς και η απουσία μεταγενέστερων επεμβάσεων αναδεικνύουν την ακρόπολη του Αγίου Αθανασίου σε μια σημαντικότατη για την κυρίως Ελλάδα θέση, που μέχρι σήμερα είχε αγνοηθεί από την έρευνα.Sur le sommet des collines au Sud-Ouest de Galaxidi subsistent les vestiges bien conservés de deux sites fortifiés aux caractéristiques architecturales intéressantes : enceinte courbe, long mur contrôlant des routes-passages importantes de la région. Le premier site, à Képhalari, est une acropole préhistorique typique, datant probablement — malgré la présence de céramique plus ancienne — de l'époque mycénienne. Le second site, à Haghios Athanassios, a un prédécesseur mycénien, mais fut reconstruit au Géométrique Récent, dont date également une nécropole fouillée à proximité. Le bon état de conservation de l'enceinte et du long mur, ainsi que l'absence de réaménagements postérieurs font de l'acropole d'Haghios Athanassios, sur un emplacement stratégique de Grèce continentale, inconnu jusqu'à ce jour, un site qui mérite l'attention.Baziotopoulou Effie, Valavanis Panos. Deux acropoles antiques sur les montagnes de Galaxidi. In: Bulletin de correspondance hellénique. Volume 117, livraison 1, 1993. pp. 189-209
La proclamation des vainqueurs aux Panathénées. À propos d'amphores panathénaïques de Praisos
No full textΗ δημοσίευση τριών παναθηναϊκών αμφορέων του τέλους του 5ου και των αρχών του 4ου αι. π. Χ. από την Πραισό, δίνει την ευκαιρία για ορισμένες παρατηρήσεις που αφορούν τις σκηνές ανακήρυξης και βράβευσης των νικητών στην αττική αγγειογραφία. Ακόμη, τονίζεται ο ρόλος των σαλπιγκτών, επισημαίνονται σε παναθηναϊκούς αμφορείς παραδείγματα διηγηματικών απεικονίσεων και γίνονται εικονογραφικές και τεχνοτροπικές παρατηρήσεις σε παναθηναϊκά αγγεία της εποχής.La publication de trois amphores panathénaïques de la fin du Ve siècle et du début du ive siècle, découvertes à Praisos, fournit l'occasion de remarques concernant les scènes de proclamation des vainqueurs et de remise des prix dans la céramique attique. L'auteur souligne aussi le rôle des joueurs de trompette, met en lumière des exemples de représentation narrative sur des amphores panathénaïques et propose des remarques iconographiques et techniques concernant les vases panathénaïques de cette époque.Valavanis Panos. La proclamation des vainqueurs aux Panathénées. À propos d'amphores panathénaïques de Praisos. In: Bulletin de correspondance hellénique. Volume 114, livraison 1, 1990. pp. 325-359
Oil price instability, hedging, and an oil stabilization fund : the case of Venezuela
Full text linkThe Venezuelan government and PDVSA (Venezuela's state oil companies) are both exposed to oil price instability. Given the existing tax structure, PDVSA has a higher exposure than the government, especially when prices drop below $18-20 a barrel. The authors show that the volatility of prices for crude oil is higher (but not significant) than the volatility of prices for refined oil products. And both prices are highly correlated. So, there is not much strength to the argument that Venezuela, being now mainly an exporter of refined products, faces less volatility than when it was exporting mainly crude oil. The basis risk for hedging Venezuelan crude oil was founded to be higher than for other crudes of comparable quality in the region. One explanation could be the pricing policies Venezuela follows, which leads Venezuelan crude oil prices to deviate for long periods from international prices. The basis risk in Venezuelan refined products is much lower and at acceptable levels for risk management. The issue of liquidity is concentrated in contracts for periods of less than a year. For products, the liquidity is concentrated in the nearest 4-5 months. So, for short-term hedges (6-9 months ahead), there is sufficient liquidity for Venezuela to hedge a substantial part of its exports. For longer-term hedges, the over-the-counter market is the more appropriate vehicle. In either case, it will not usually be the case that all production or exports should be hedged. The authors also examined the issue of an oil stabilization fund. For an oil stabilization fund to be effective several preconditions must be met. Most notably: oil prices should not follow a random walk; financial markets are incomplete; and there are large adjustment costs. These conditions do likely apply in Venezuela. Venezuela's best strategy would be to remove as much short-term oil price risk as possible by using short-dated hedging instruments (such as futures, options, or short-dated swaps) and to also do some longer term hedging (using mainly over-the-counter options and long-dated swaps). They also find that an oil stabilization fund should be complemented by using market-based risk management tools. The oil stabilization fund could then be used to manage any remaining interperiod oil price risk to the extent considered necessary.Markets and Market Access,Environmental Economics&Policies,Oil Refining&Gas Industry,Energy and Environment,Energy Demand
A supervisory approach to microgrid demand response and climate control
No full textMicrogrids equipped with small-scale renewable-energy generation systems and energy storage units offer challenging opportunity from a control point of view. In fact, in order to improve resilience and enable islanded mode, micro-grid energy management systems must dynamically manage controllable loads by considering not only matching energy generation and consumption, but also thermal comfort of the occupants. Thermal comfort, which is often neglected or oversimplified, plays a major role in dynamic demand response, especially in front of intermittent behavior of the renewable energy sources. This paper presents a novel control algorithm for joint demand response management and thermal comfort optimization in a microgrid composed of a block of buildings, a photovoltaic array, a wind turbine, and an energy storage unit. In order to address the large-scale nature of the problem, the proposed control strategy adopt a two-level supervisory strategy: at the lower level, each building employs a local controller that processes only local measurements; at the upper level, a centralized unit supervises and updates the three controllers with the aim of minimizing the aggregate energy cost and thermal discomfort of the microgrid. Comparisons with alternative strategies reveal that the proposed supervisory strategy efficiently manages the demand response so as to sensibly improve independence of the microgrid with respect to the main grid, and guarantees at the same time thermal comfort of the occupants.Accepted Author ManuscriptTeam Bart De Schutte
Les hippodromes et les concours hippiques dans la grèce antique
No full textLes courses hippiques ont eu dans le monde grec une importance considérable, non seulement dans les concours olympiques, mais dans beaucoup d’autres rencontres sportives de fréquentation locale, régionale ou panhellénique. Ce volume constitue le premier ouvrage exclusivement consacré à ces courses et aux hippodromes. Il rend compte des importants progrès faits ces dernières années dans l’analyse des représentations iconographiques et des textes littéraires ou épigraphiques ayant trait aux sports hippiques. Il contient de nouvelles restitutions d’hippodromes déjà connus, comme ceux d’Olympie et du Lykaion, et la présentation de pistes nouvellement identifiées, comme celles de Delphes ou d’Épidaure. Vingt-huit articles, issus d’un colloque international qui s’est tenu à Athènes en 2016, restituent dans toute leur ampleur et dans toute leur diversité la place et la forme des hippodromes et des courses hippiques dans l’architecture, les arts figurés, la poésie et l’histoire politique, économique, sociale et religieuse du monde grec.Horse racing held a significant role in the Greek world, not only in the Olympic competitions, but in many other sporting events – local, regional or Panhellenic. This volume is the first study to exclusively investigate these races and hippodromes. This volume acknowledges the significant progress made in recent years in the analysis of iconographic representations and literary or epigraphic texts relating to hippic sports. It outlines new reproductions of already known racetracks, such as those of Olympia and the Lykaion, and presents newly identified tracks, such as those of Delphi or Epidaurus. Twenty-eight articles, coming out of an international conference held in Athens in 2016, reproduce in all their breadth and diversity, the place and the form of racetracks and horse racing in architecture, the figurative arts, poetry and the political, economic, social and religious history of the Greek world
Aspects of Organisation of Macedonian Cemeteries from the Archaic to the Hellenistic Times
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