569 research outputs found
Marwan Rashed, Essentialisme. Alexandre d’Aphrodise entre logique, physique et cosmologie. Berlin-New York, W. de Gruyter, 2007
No full textGavray Marc-Antoine. Marwan Rashed, Essentialisme. Alexandre d’Aphrodise entre logique, physique et cosmologie. Berlin-New York, W. de Gruyter, 2007. In: L'antiquité classique, Tome 79, 2010. pp. 497-499
Before and After the Commentators: An Essay in Periodization.
No full textL'articolo considera il significato storico e filosofico dei commentatori neoplatonici di Aristotele. Gli autori situano il recente Sourcebook sui commentatori edito da Richard Sorbji in un contesto più ampio, che include il contributo dei commentatori nella formazione della filosofia tardo-antica e la loro posterità nella tradizione filosofica islamica. Dopo una sezione introduttiva (1) sullo stato attuale della ricerca in questo ambito, gli autori affrontano i temi seguenti: (2) Plotino, i commentatori e lo sviluppo del pensiero tardo antico; (3) il Sourcebook e la filosofia islamica. Riccardo Chiaradonna è co-autore della sezione (1) e autore della sezione (2), dove la ricezione dei trattati di scuola aristotelici è presentata come una caratteristica fondamentale nella transizione dalla filosofia post-ellenistica a quella tardo-antica. Plotino ha un ruolo cruciale in questo processo e l'assimilazione neoplatonica dei trattati di Aristotele non avrebbe avuto luoro senza il suo contributo.This article considers the historical and philosophical significance of the Neoplatonic commentators on Aristotle. The authors set Richard Sorabji's recent Sourcebook on the commentators within a wider backgroung, which covers the commentators' contribution in the shaping of late antique philosophy and their posterity in the Islamic philosophical tradition. After an introductory section (1) regarding the current status of research in this area, the authors tackle the following issues: (2) Plotinus, the commentators and the development of late antique thought; (3) the Sourcebook and Islamic Philosophy. Riccardo Chiaradonna is co-author of section (1) and author of section (2), where the reception of Aristotle's school treatises is set out as a key feature in the transition from Post Hellenistic to Late Antique philosophy. Plotinus has a pivotal position in this process and the Neoplatonic incorporation of Aristotle's treatises would have not taken place without Plotinus' contribution
Roshdi Rashed, Apollonius de Perge, Coniques. Tome 2.1 : Livres II et III. Commentaire historique et mathématique, édition et traduction du texte arabe. Berlin-New York, W. de Gruyter, 2010 (Scientia Graecoarabica, 1/ 2.1)
No full textVanthieghem Naïm. Roshdi Rashed, Apollonius de Perge, Coniques. Tome 2.1 : Livres II et III. Commentaire historique et mathématique, édition et traduction du texte arabe. Berlin-New York, W. de Gruyter, 2010 (Scientia Graecoarabica, 1/ 2.1). In: L'antiquité classique, Tome 83, 2014. p. 370
Roshdi Rashed et Hélène Bellosta, Apollonius de Perge, La section des droites selon des rapports. Commentaire historique et mathématique, édition et traduction du texte arabe. Berlin-New York, W. de Gruyter, 2010 (Scientia Graeco-Arabica, 2)
No full textVanthieghem Naïm. Roshdi Rashed et Hélène Bellosta, Apollonius de Perge, La section des droites selon des rapports. Commentaire historique et mathématique, édition et traduction du texte arabe. Berlin-New York, W. de Gruyter, 2010 (Scientia Graeco-Arabica, 2). In: L'antiquité classique, Tome 83, 2014. p. 371
Source misalignment in multimode polymer tapered waveguides for optical backplanes
No full textPolymer tapered multimode waveguides were modeled using the finite difference wide-angle beam propagation method to investigate whether tapered input waveguide couplers decreasing in width away from the waveguide entrance give improved tolerance to lateral misalignments of an optical source compared to straight waveguides and whether there is any effect on angular misalignment tolerance for use in optical backplane interconnections. Input tapered couplers having a larger entrance and tapering down in width do indeed improve the lateral misalignment tolerance compared to straight waveguides but do so at the expense of an increased loss. Tapers have no effect on angular tolerance for strongly driven vertical cavity surface-emitting laser (VCSEL) sources although they cause a loss of angular tolerance for single-mode fiber sources and VCSELs at low drive currents. (c) 2007 Society of Photo-Optical Instrumentation Engineers
Polymer multimode waveguide optical and electronic PCB manufacturing
No full textThe paper describes the research in the £1.3 million IeMRC Integrated Optical and Electronic Interconnect PCB Manufacturing (OPCB) Flagship Project in which 8 companies and 3 universities carry out collaborative research and which was formed and is technically led by the author. The consortium’s research is aimed at investigating a range of fabrication techniques, some established and some novel, for fabricating polymer multimode waveguides from several polymers, some formulations of which are being developed within the project. The challenge is to develop low cost waveguide manufacturing techniques compatible with commercial PCB manufacturing and to reduce their alignment cost. The project aims to take the first steps in making this hybrid optical waveguide and electrical copper track printed circuit board disruptive technology widely available by establishing and incorporating waveguide design rules into commercial PCB layout software and transferring the technology for fabricating such boards to a commercial PCB manufacturer. To focus the research the project is designing an optical waveguide backplane to tight realistic constraints, using commercial layout software with the new optical design rules, for a demonstrator into which 4 daughter cards are plugged, each carrying an aggregate of 80 Gb/s data so that each waveguide carries 10 Gb/s
Lipidy nasion czarnuszki siewnej (Nigella sativa L.)
No full textW pracy przeprowadzono fizyko-chemiczną charakterystykę oleju czarnuszki siewnej.
Materiał badawczy stanowiły nasiona pochodzące z plantacji usytuowanej w Ogrodzie Doświadczalnym ART w Olsztynie. W nasionach oznaczono podstawowe składniki chemiczne: tłuszcz, białko, błonnik, popiół, węglowodany. W oleju określono skład procentowy frakcji acylogliceroli, skład kwasów tłuszczowych oraz substancje biologicznie aktywne rozpuszczalne w tłuszczach. Ponad 40% zawartości oleju w nasionach czarnuszki siewnej upoważnia do zaliczania tej rośliny do grupy roślin oleistych alternatywnych. Natomiast kompozycja ilościowa i jakościowa oleju tłoczonego, a przede wszystkim skład kwasów tłuszczowych i poziom ilościowy tokoferoli i karotenoidów pozwala zaliczyć olej z nasion czarnuszki siewnej do olejów dietetycznych.Physical and chemical features of black cumin seeds oil were analyzed in this study. Seeds from plantation located in experimental garden of Olsztyn University were used for investigativon. Basic chemical components: fat, protein, fiber, ash and carbohydrates were determined in seeds. Percentage of acyloglicerols fractions, fatty acids composition and biologically active substances soluble in fat were determined in seed oil. Over 40% oil content in black cumin seeds enable including these plants into groups of alternative oliferous plants. However, the quantitative and qualitative composition of pressed-oil and, first of all, the fatty acid composition and quantitative level of tocopherols and carotenoids, permit to account the oil of black cumin seeds to dietetic ones
Modelling of the effects of thermal gradients on optical propagation in polymer multimode tapered waveguides in optical backplanes
No full textFinite difference beam propagation modelling (FD-BPM) calculates the effect of thermal gradients in an optical backplane on the optical field propagation in a polymer multimode linearly tapered waveguide. Compared to straight waveguides, tapered entrances offer improved power coupling for a wide range of optical source lateral offset misalignments. However, surface temperature gradients of 0.5 degrees C/um across the taper were found to degrade this benefit due to the thermo-optic effect of the polymer. Higher surface temperature gradients improve power coupling in two discrete ranges of lateral source offset but the original tolerance to a wide range of source offsets is not recovered
Modeling of a polymer 1x3 MMI power splitter for optical backplane
No full textA 0.4 dB excess loss, 0.01 dB output channel imbalance polymer 1 x 3 MMI power splitter is modeled having linearly tapered input section suitable for use in an optical backplane connector. The device design was additionally optimized using FD-BPM to have a good tolerance to source lateral misalignments
The European REFORM Project for Hydromorphological Quality in River Basin Management
No full textThe Water Framework Directive commits European Union member states to achieve good ecological and chemical status of all water bodies. As hydromorphology is a key factor for ecological status, a consortium of 26 partners from 15 countries studied the role of hydromorphological pressures and measures in the REFORM project. Its main objective was to answer the question: How to make river restoration successful? The project developed guidance for this by structuring the information along the different stages of restoration projects and river basin management plans, posing a logical sequence of questions: How does my river work? What’s wrong? How to improve? Things can be wrong for ecological status as a result of morphological alterations. These alterations form pressures that can be countered or mitigated by measures that improve sedimentological and morphological features. We present two specific results of REFORM that focus on river morphology. First, we provide an overview of methods to assess morphological quality and diagnose alteration. Second, we present systematic cause–effect relationships for restoration measures.Rivers, Ports, Waterways and Dredging Engineerin
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