1,721,767 research outputs found
K. Chatzopoulos, Sp. Pasagiannēs kai alloi. /
No full textRomanized record.Compilation of texts, with bio-bibliographical information.Kōnstantinos Chatzopoulos.--Kōstas Paroritēs.--Dēmētrios Chatzopoulos.--Dēmētrios P. Tankopoulos.--Spēlios Pasagiannēs.--Kōstas Pasagiannēs.--Panos D. Tankopoulos
Dataset for “High-Q/V photonic crystal cavities and QED analysis in 3C-SiC”
No full textDataset supports: Chatzopoulos, I., Martini, F., Cernansky, R., & Politi, A. (2019). High-Q/V photonic crystal cavities and QED analysis in 3C-SiC. ACS Photonics.</span
Data for Engineering spatial coherence in lattices of polariton condensates
No full textExperimental data and numerical simulation results used to create the figures in the paper J. D. Töpfer, I. Chatzopoulos, H. Sigurdsson, T. Cookson, Y. G. Rubo, and P. G. Lagoudakis (2020), Engineering spatial coherence in lattices of polariton condensates, Optica.</span
The German realism and the short stories of Costantinos Chatzopoulos
No full text[Δε διατίθεται περίληψη]This article is an analysis and a reevaluation of the main characteristics of the literary movement of the German ('bourgeois' or 'poetic') realism and of the short stories of Costantinos Chatzopoulos. My analysis confirms that the Greek author was greatly influenced by this literary movement, with which he became familiar during the ten years of his migration in Germany. In this study I try to retrace and register the main aesthetic and ideological implications of the German movement, as they are expressed in the narratives of Chatzopoulos in his attempt to define the Self and its main experiences at the dawn of the 20th century
Constantinos Chatzopoulos as a literary critic
No full textLa critique littéraire représente une part non négligeable de l’œuvre de Constantin Chatzopoulos (Agrinion 1868 - Brindisi 1920). Comparée aux autres genres littéraires, auxquels il a sacrifié (poésie, prose, traduction, essais politiques), elle demeure jusqu’à nos jours le volet le moins connu de son œuvre. La première démarche indispensable afin de proposer une étude de son œuvre critique la plus complète possible, était de réunir l’ensemble de ses articles, parallèlement à ceux qui déjà étaient connus. Tel est l’objectif de la première partie de ce travail qui fait le point de la recherche. La seconde partie, théorique, suit la critique littéraire de Chatzopoulos dans le cadre des deux périodes de son développement : a) l’influence symboliste et nietzschéenne (1898-1902) et b) l’influence sociologique et marxiste (1907-1916). Sont présentés, pour ces deux phases, les revues littéraires qui ont accueilli les textes de l’écrivain. Chatzopoulos représente un chapitre important de l’histoire de la pensée critique grecque, car son œuvre rend compte des courants esthétiques et idéologiques de son époque auxquels elle est intimement liée. Dans la Grèce des débuts du siècle passé, il fut le premier à introduire les principes sociologiques et marxistes dans l’approche d’une œuvre littéraire.Literary criticism represents an interesting part of the Constantinos Chatzopoulos’ (Agrinion 1968 - Prindisi 1920) writing creation. Until our days it remains the least known compared to other literature types, which he served (poetry, prose, translation, political essay). A condition for a fuller study of his work as a critic was the collection of his articles, in addition to those which were already known. Hence this is the aim of all the elements which compose the first research part of our thesis. The second, theoretical part of the thesis monitors the Chatzopoulos’ literary criticism works within the pale of the two phases it occurs: a) the symbolistic - nietzscheic (1898-1902) and sociological - marxist (1907-1916). In both stages the presentation of the literary publications in which works by the author appeared is preceded. Chatzopoulos represents an important asset in the history of the Greek critical thinking, because his work was associated with aesthetic and ideological movements of his time. In Greece of the early past century, he is the first to introduce the sociological and Marxist values into the approach of literary work
SciTo Trends: Visualising Scientific Topic Trends
No full text<p>Presentation of the TPDL 2019 demo paper "SciTo Trends: Visualising Scientific Topic Trends".</p>
<p><a href="https://scito.imsi.athenarc.gr">SciTo Trends</a> is a platform that facilitates exploration of scientific topic trends and provides intuitive infographics to showcase the topics' popularity trends. </p>
<p>Full author list: Serafeim Chatzopoulos, Panagiotis Deligiannis, Thanasis Vergoulis, Ilias Kanellos, Christos Tryfonopoulos, Theodore Dalamagas</p>
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Silicon carbide photonic platform based on suspended subwavelength waveguides
No full textSilicon carbide (SiC) displays a unique combination of optical and spin-related properties that make it interesting for photonics and quantum technologies. However, guiding light by total internal reflection can be difficult to achieve, especially when SiC is grown as thin films on higher index substrates, such as silicon. Fabricating suspended subwavelength waveguides requires a single lithography step and offers a solution to the confinement problem, while preserving the design flexibility required for a scalable and complete photonic platform. Here we present a design for such a platform, which can be used for both classical and quantum optics operation. We simulate basic optical components and analyze how to exploit the high nonlinearities of SiC and its defects.</p
Integrated photonics for SiC quantum technologies
No full textSince the discovery of peculiar phenomena in the nano-world, at the beginning of last century, our understanding of nature at this level has being constantly improving through the establishment of quantum theory. A plethora of benefits has already been exploited in semiconductors, paving the way for the age of electronics. Despite the new, groundbreaking developments, this wasn’t but the first step on the spectrum of capabilities the quantum world could offer us. The second step that will follow is about quantum technologies exploiting the very nature of quantum physics and embracing these counter-intuitive phenomena to harness an advantage over the so far, classical operation of electronics. On this route, there are many challenges still remaining, with scalability being the toughest. Our approach to tackle this issue, is to have all components needed integrated on chip, on a fabrication friendly material. Moreover, this material has to host quantum emitters which should be easily and reliably being controlled. Such a material is silicon carbide since it’s been used for decades by the high power electronics industry while at the same time, colour centres in silicon carbide have been shown to have a high level of familiarity with the NV− centre in diamond. We aim on developing fabrication techniques that will allow us to have a reliable platform for quantum technologies. We aim on fabricating high quality factor photonic crystal cavities with embedded colour centres which would deliver high Purcell factors. Purcell factor’s importance would become prominent as we demonstrate its connection with two of the most important parameters for quantum technology applications, namely the indistinguishability and the emitter-photon coupling efficiency. Our high level of fabrication fidelity, allows us to fabricate complex cavity designs with high Q/V ratios. A simulated photonic crystal cavity design in SiC of Q/V ∼ 500, 000(n/λ) 3 will be presented and fabricated. The homebuilt confocal microscopy setup will be described in detail and its abilities will be manifested. Using this setup, we are able to measure photonic crystal cavities with Q factors as high as 7138, the highest reported in 3C-SiC. Such cavities could yield a Purcell factor of 443 and consequently indistinguishability could reach to 0.85 with coupling efficiencies of 0.97. Further efforts have to be made to characterise these parameters, as preliminary work has been made to implant colour centres in photonic crystal cavities
Hydrogen-Poor Circumstellar Shells From Pulsational Pair-Instability Supernovae With Rapidly Rotating Progenitors
No full textIn certain mass ranges, massive stars can undergo a violent pulsation triggered by the electron/positron pair instability that ejects matter, but does not totally disrupt the star. After one or more of these pulsations, such stars are expected to undergo core-collapse to trigger a supernova (SN) explosion. The mass range susceptible to this pulsational phenomena may be as low as 50-70 M-circle dot if the progenitor is of very low metallicity and rotating sufficiently rapidly to undergo nearly homogeneous evolution. The mass, dynamics, and composition of the matter ejected in the pulsation are important aspects for determining the subsequent observational characteristics of the explosion. We examine the dynamics of a sample of stellar models and rotation rates and discuss the implications for the first stars, for LBV-like phenomena, and for superluminous SNe. We find that the shells ejected by pulsational pair-instability events with rapidly rotating progenitors (>30% the critical value) are hydrogen-poor and helium- and oxygen-rich.NSF AST-1109801University of Texas Graduate SchoolAstronom
Imaginary counter-trafficking penalties: a comparative analysis of Greece and the United Kingdom
No full textThe wars on sex trafficking have traditionally focused on the proliferation of criminal sanctions, the militarization of border controls, and the criminalization and marginalization of the sex industry. In recent years, however, the human rights approach has emerged as a key component of a new reframed, holistic anti-trafficking discourse. According to this approach, human rights are shown to have significant importance for bringing together prevention, prosecution, protection of victims and partnerships to deliver gendered victim services. While valuable, our analysis draws on a comparative examination of the wars on sex trafficking to highlight the significant limitations of dominant contemporary anti-trafficking discourses and technologies. Using Greece and the United Kingdom as case studies, the present article examines the criminalization and human rights anti-trafficking components in the context of the initial “war on trafficking” and investigates the diverse articulations and crucial limitations that have created the differences of these two anti-trafficking models. We conclude by suggesting that in recent years the “war on trafficking” framework is gradually fading away. In its place the new anti-trafficking inferential schemes take the form of evidence-based, market driven products
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