22,829 research outputs found
The politics and economics of regulatory impact assessment
No full textThis is the author accepted manuscript. The final version is available from the publisher via the link in this record
Viaggio e immaginario: il Sud America di Sepúlveda
No full textL'odeporica costituisce un genere particolarmente fecondo per la prospettiva geografica: la costruzione di spazialità e immaginari passa per specifiche forme di testualizzazione che riconducono a complesse (ri)produzioni culturali. A partire dall'analisi geoculturale di alcuni brani significativi de Patagonia Express di Luis Sepúlveda, questo contributo intende mostrare alcune modalità attraverso le quali l'autore cileno ricostruisce, nel suo racconto di viaggio in forma di appunti, spazialità, paesaggi e interazioni visitando luoghi particolarmente ostili del continente Sudamericano, come la Patagonia e il deserto di Atacama. L'analisi di tali brani si concentra sulla narrazione dell'esperienza autobiografica dell'autore che attinge a un vasto immaginario personale e collettivo, allo stesso tempo riproducendolo.Travel narrative is a fruitful genre for the geographical perspective. The construction of spatiality and imaginaries takes place through specific forms of textualization that lead back to complex cultural (re)productions. Starting from a geocultural analysis of some significant texts of Patagonia Express by Luis Sepulveda, this study aims to show some ways in which the Chilean author reconstructs, in his trave! story written as notes, spatiality, landscapes and interactions by visiting particularly hostile places on the South American continent, such as Patagonia and the Atacama Desert. The analysis of these passages focuses on the narration of the author's autobiographical experience that draws on a wide persona! and collective imaginary, reproducing it at the same time
Phase Distribution Efficiency of cm-Scale Ultrasonically Powered Receivers
No full textIn the domain of ultrasonically powered biomedical implants, there is an increasing interest in cm-scale ultrasonic receivers (RX). However, when a single-element transducer is used as the RX transducer, an uneven phase distribution across the RX area can significantly reduce the harvestable power. In this paper, we investigate the impact of lateral and angular misalignment on the acoustic field phase distribution across the RX surface. We show that, for a single-element RX transducer, lateral misalignment has minimal effect on the harvestable power, whereas even small angular misalignments can cause a considerable reduction, especially for larger RX sizes. We present a potential solution that consists of subdividing a large RX transducer (e.g. 20 × 20mm2) into smaller elements, which significantly improves power transfer efficiency by taking advantage of the smaller phase variation across the surface of each element. The trade-offs between achieving a minimum acceptable power transfer efficiency and managing the increased complexity in packaging and matching circuitry are also discussed.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and MaterialsBio-Electronic
Highly efficient laser-driven Compton gamma-ray source
No full textThe recent advancement of high-intensity lasers has made all-optical Compton scattering become a promising way to produce ultrashort brilliant gamma-rays in an ultra-compact system. However, so far achieved Compton gamma-ray sources are limited by low conversion efficiency and spectral intensity. Here we present a highly efficient gamma photon emitter obtained by irradiating a high-intensity laser pulse on a miniature plasma device consisting of a plasma lens and a plasma mirror. This concept exploits strong spatiotemporal laser-shaping process and high-charge electron acceleration process in the plasma lens, as well as an efficient nonlinear Compton scattering process enabled by the plasma mirror. Our full three-dimensional particle-in-cell simulations demonstrate that in this novel scheme, brilliant gamma-rays with very high conversion efficiency (higher than 10(-2)) and spectral intensity (similar to 10(9) photons/0.1%BW) can be achieved by employing currently available petawatt-class lasers with intensity of 10(21) W cm(-2). Such efficient and intense gamma-ray sources would find applications in wide-ranging areas. ©2019 The Author(s)
Stimulant Use Disorder (SUD): A Clinical Review
No full textStimulant Use Disorder (SUD) is primarily treated with nonpharmacological and pharmacological treatment options. Evidence has shown that contingency management (CM) is an important non-pharmacological treatment option that can be utilized in the treatment of stimulant use disorder (SUD). The treatment is correlated with strong evidence-based data for both cocaine and methamphetamine use disorders. There is no current FDA approved medication for SUD, however studies reveal positive outcomes for a variety of medications. Pharmacological treatment data is limited for stimulant use disorder. Higher quality clinical trials are needed to conclude the benefits of pharmacotherapies. Exploring the pathophysiology, clinical presentation, and treatment options for SUD can help support medical professionals in making informed decisions for patients diagnosed with SUD
Hadjerat El M'Guil (Extrême Sud-Oranais). 1902
No full textHadjerat El M'Guil (Extrême Sud-Oranais) 1902 Carte lithographiée, 20 x 29 cm Source : Bibliothèque nationale de France, Département des Cartes et plans, Ge D 4559 Pour explorer le document et ses détails : http://gallica.bnf.fr/ark:/12148/btv1b8443618
Hadjerat El M'Guil (Extrême Sud-Oranais). 1902
No full textHadjerat El M'Guil (Extrême Sud-Oranais) 1902 Carte lithographiée, 20 x 29 cm Source : Bibliothèque nationale de France, Département des Cartes et plans, Ge D 4559 Pour explorer le document et ses détails : http://gallica.bnf.fr/ark:/12148/btv1b8443618
CM Periods, CM Regulators, and Hypergeometric Functions, I
No full textWe prove the Gross-Deligne conjecture on CM periods for motives associated with H-2 of certain surfaces fibered over the projective line. Then we prove for the same motives a formula which expresses the K-1-regulators in terms of hypergeometric functions F-3(2), and obtain a new example of non-trivial regulators
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