1,355,756 research outputs found
Gravitational parameter estimation in a waveguide
No full textWe investigate the intrinsic uncertainty in the accuracy to which a static spacetime can be measured from scattering experiments. In particular, we focus on the Schwarzschild black hole and a spatially kinked metric that has some mathematical resemblance to an expanding universe. Under selected conditions we find that the scattering problem can be framed in terms of a lossy bosonic channel, which allows us to identify shot-noise scaling as the ultimate scaling limit to the estimation of the spacetimes. Fock state probes with particle counting measurements attain this ultimate scaling limit and the scaling constants for each spacetime are computed and compared to the practical strategies of coherent state probes with heterodyne and homodyne measurements. A promising avenue to analyze the quantum limit of the analogue spacetimes in optical waveguides is suggested
The 'Legend' of Alekos Doukas: A critical counter reading
No full textThis paper examines how the writer Alekos Doukas (1900–1962) has been read and interpreted in later years as a migrant intellectual and socialist. I argue that Doukas has become a figure of myth through a process of oral and written transmission. He is invariably represented as a unitary socialist subject who encapsulates the experience and revolutionary consciousness of a migrant collectivity. Many writers refer to Doukas’ life and experiences through a quite literal reading of his postwar novels. How do we account for the reading of his fiction as fact? We need to explore the function of myth and its discursive shaping of migrant narratives of the past and present
A Full End-to-End Platform as a Service for Smart City Applications
No full textThis paper presents COMPOSE, an open-source Platform as a Service (PaaS) for developing Smart City solutions based on connected objects. COMPOSE is built around open-source components that allow storing, streaming and processing of sensor data, communication with connected objects using M2M protocols, service discovery, data provenance and multi-tenancy, deployment and scalable hosting of applications in a cloud environment, workflow editing and cross-platform smartphone application development. A use case developed for deployment in the city of Barcelona that utilizes the aforementioned components among with parking and traffic sensors is also presented
Aristocratic Clans of Asia Minor between 976 and 1025: Andronikos Doukas Lydos and His Sons
No full textСтатья поступила в редакцию 07.07.2014 г.В статье восстанавливается cursus honorum византийского военачальника конца X — начала XI вв. Варды Дуки. Он принадлежал к семье провинциальной военной аристократии из фемы Фракисий. В 976 г. его отец, патрикий Андроник Дука Лид, присоединился к мятежу Варды Склира. После поражения восстания сыновья Андроника, Христофор и В арда, захватили во Фракисии крепость Платея Петра. В 980 г. Василий II помиловал их, и В арда Дука вернулся на службу в императорскую армию. Известны его печати: протоспафария и турмарха Веррии; анфипата и патрикия. Последнее упоминание о В арде Дуке относится к 1016/1017 г., когда он принимал участие в подавлении восстания архонта Хазарии Георгия Цулы. Из письменных источников Варда Дука упоминается только в «Синопсисе историй» Иоанна Скилицы. По мнению автора статьи, при составлении своей хроники Иоанн Скилица использовал не сохранившийся до нашего времени текст, происходивший из Фракисия (возможно, сочинение монаха Иоанна Лидийского).The article describes the cursus honorum of Bardas Doukas, a Byzantine commander of the late 10th — early 11th century. He descended from a provincial military aristocratic family of the Thracesian Theme. In 976, his father patricius Andronikos Doukas Lydos joined the rebellion of Bardas Skleros. After the defeat of the rebellion, Andronikos’ sons, Christophorus and Bardas, captured the fortress of Plateia Petra in the Thracesian Theme. In 980, Basil II granted them pardon, and Bardas Doukas continued his service in the imperial army. There are data about his seals of the Protospapharius and Turmarchus of Veroia; an anthipatus and patricius. The last record of Bardas Doukas dates back to 1016–1017 when he took part in the suppression of the uprising of Georgius Tzul, an Archon of Khazaria. Out of all written sources, Bardas Doukas is only mentioned in the Synopsis Historiarum of John Skylitzes. According to the author, when compiling his chronicles, John Skylitzes used a text of which no surviving copy is known to exist and which originated from the Thracesian Theme (probably, a work of John the Monk of Lydia)
[The fossil record of the Eurasian Neogene insectivores (Erinaceomorpha, Soricomorpha, Mammalia) : Part I / L.W. van den Hoek Ostende, C.S. Doukas and J.W.F. Reumer (editors)]: Greece
No full textIntroduction The Neogene insectivores from Greece span an interval from Early Miocene to Biharian but certainly do not represent a continuous succession.
The first reference of small mammals in Greece is by Dames (1883), who described Mus [=Parapodemus] gaudryi from the classical locality of Pikermi. The first report of an insectivore is again from Pikermi. Thenius (1952) described a fragmentary mandible with p2-m2 sin., plus an isolated p4 dex. as Galerix exilis. Doukas et al. (1995) referred the specimen to Schizogalerix moedligensis.
Credit should be given here to Hans de Bruijn (Utrecht University), who was instrumental in promoting small mammal research in Greece. The search and research for small mammals started in earnest in 1970, when De Bruijn started collecting in various localities. This is the reason why part of the Greek material is stored at the small mammal collections of Utrecht University and part at the small mammal collections of the Paleontology Museum of Athens University. De Bruijn, a dedicated "rodent man" himself, recognized the importance of insectivores in the study of small mammal assemblages, and enticed others, including the present author, to work on them.
An effort is made to include here yet unpublished faunas that are in preparation.
We feel that this volume is an important work for future references and would be shame not to include faunas that will be published shortly. Therefore provisional fauna lists are given for the localities from Karydia and Komotini (NE Greece), and from the FlorinaPtolemais-Servia basin (NW Greece). The small mammal material of the latter localities
COVID-19 and Tail-event Driven Network Risk in the Eurozone
No full textThis paper analyses tail risk spillover, considering interaction of the 46 largest capitalization firms in the Eurozone over the period 9 January 2006 to 28 December 2020 (including part of the COVID-19 era). Employing the Tail-Event driven NETwork (TENET) model, our findings identify insights about the risk sender and receiver in interrelationships of systemic risk beyond contemporaneous total spillover effects. First, total connectedness surged and peaked in the early months of 2020, relative to previous crises. Second, industrial manufacturing and consumer products have a high degree of risk transmission. Third, we determine the predictive indicators of spillover risk. Finally, our results hold several policy implications
Il ‘copista di Doukas’: nuovi elementi per una vecchia identificazione
No full textThis study examines the activity of a fifteenth-century Byzantine scribe, identified by Sofia Kotzabassi as the historian Doukas, a figure still shrouded in mystery. The paper provides an overview of the manuscripts so far attributed to this scribe and introduces new textual and palaeographical evidence supporting Kotzabassi’s identification. Among the key contributions is the discovery of the scribe’s hand in the margins of the manuscript Paris. gr. 1267, which allows for a deeper understanding of the sources used by the historian Doukas. An appendix includes a transcription of the annotations by the so-called "scribe of Doukas" and a detailed description of the content of Paris. gr. 1267. The study aims to shed further light on Doukas’s role in the Byzantine manuscript tradition and to offer new perspectives for palaeographical and historical research
The military policy of Komstantinos X Doukas
No full textВ статье анализируется военная политика византийского императора Константина X Дуки (1059-1067). Этот император был выразителем интересов высшей столичной бюрократии, его политика была направлена на ослабление провинциальной военной знати. С этой целью правительство Константина X (кесарь Иоанн Дука, Константин Лихуд, Иоанн Ксифилин, Михаил Пселл) сократило финансирование вооруженных сил, расформировало многие военные подразделения, увеличило численность наемных отрядов. Результатом политики Константина X стал кризис императорской армии и тяжелые поражения византийских войск от сельджуков, норманнов и печенегов.The article is devoted to the analysis of the military policy of the Byzantine emperor Konstantinos X Doukas (1059–1067). He was the representative of the interests of the higher bureaucracy. His policy was aimed at the slackening of provincial military aristocracy. For this aim the government of Konstantinos X (caesar Ioannes Doukas, Ioannes Xiphilinos, Konstantinos Leichoudes, Michaelis Psellos) undertook the series steps: the restriction of the financing of armed forces, the disbanding
lots of military sub-units, the increase in manpower of mercenary detachments. The results of the policy of Konstantinos X were the crisis of
imperial army and severe defeats of the Byzantine troops by the Seljuks, Northmen and Pechenegs.Исследование выполнено при финансовой поддержке Министерства образования и науки Российской Федерации в рамках ФЦП «Научные и научно-педагогические кадры инновационной России» на 2009–2013 гг., ГК 02.740.11.0578
Iconographic images on the seals and coinage of the Doukas dynasty
No full textThe paper analyzes the iconography of the images on the seals and coins of
the Byzantine Doukas dynasty (1059-1078). It points to the iconographic
motifs the Doukas emperors introduced or reintroduced into Byzantine
sphragistics and numismatics. What is especially highlighted is the power of
the Byzantine imperial ideology of the divine origin of emperorship which
played a prominent role in the iconography of the imperial seals and coins of
the Doukas dynasty. [Projekat Ministarstva nauke Republike Srbije, br.
177015: Hrišćanska kultura na Balkanu u srednjem veku: Vizantijsko carstvo,
Srbi i Bugari od IX do XV veka
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