121 research outputs found
Shakespeare na Itália: construção intersemiótica de Re Lear e La tempesta em Giorgio Strehler
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Estudos da Tradução, Florianópolis, 2014.O objetivo desta pesquisa reside em analisar o processo criativo e artístico do diretor italiano Giorgio Strehler na produção e direção de duas peças shakespearianas: Rei Lear e A Tempestade. As montagens teatrais, intituladas pelo diretor como Re Lear e La Tempesta, foram encenadas, respectivamente, em 1972 e 1978, no Piccolo Teatro de Milão, na Itália, e foram muito importantes para a sociedade italiana da época. Dessa forma, no estudo das produções italianas, busca-se explorar, com base nos conceitos de Tradução Intersemiótica, as passagens mais relevantes e/ou mais reveladoras para o contexto sóciopolítico italiano da época e que influenciaram, de alguma forma, a tradição shakespeariana na dramaturgia italiana. As análises mostraram que Strehler buscou, tanto em Re Lear, quanto em La Tempesta, evidenciar a metateatralidade existente nas respectivas peças shakespearianas e, com isso, gerar uma reflexão acerca do teatro e sua função social, política, histórica e civil em determinada sociedade, tempo e espaço.Abstract : This research aims at analysing the creative and artistic process of the Italian diretor Giorgio Strehler in the production and direction of two Shakespearian playtexts: King Lear and The tempest. The Italian productions -- entitled Re Lear and La Tempesta -- were staged, respectively, in 1972 and in 1978, at Piccolo Teatro di Milano, Italy, and were important to the Italian society of the time. Thus, in the analysis of the productions, I attempted to explore, based on concepts of Intersemiotic Translation, the most revealing and/or relevant passages to the Italian socio-political context of the time that influenced, in a way or another, the Shakespearian tradition in Italian dramaturgy. The analyses have shown that Strehler attempted to highlight -- in both productions -- the metatheatricality that exists in these Shakespearian playtexts and, from this perspective, encourage a reflection upon theater and its social, political, historical, and civic functions in a certain society, time, and space
Photonic heat amplifier based on a disordered semiconductor
No full textA photonic heat amplifier designed for cryogenic operations is introduced and analyzed. This device comprises two variable-range-hopping reservoirs connected by lossless lines, which allow them to exchange heat through photonic modes. This configuration enables negative differential thermal conductance, which can be harnessed to amplify thermal signals. To achieve this, one reservoir is maintained at a high temperature, serving as the source terminal of a thermal transistor. Concurrently, in the other reservoir, we establish tunnel contacts to metallic reservoirs, which function as the gate and drain terminals. With this arrangement, it is possible to control the heat flux exchange between the source and the drain by adjustment of the gate temperature. We present two different parameter choices that yield different performances: the first emphasizes modulation of the source-drain heat current, while the second focuses on the modulation of the lower-temperature variable-range-hopping reservoir. Lastly, we present a potential design variation in which all electronic reservoirs are thermally connected through only photonic modes, allowing interactions between distant elements. The proposed photonic heat amplifier addresses the lack of thermal transistors and amplifiers in the millikelvin range, while being compatible with the rich toolbox of circuit quantum electrodynamics. It can be adapted to various applications, including sensing and the development of thermal circuits and control devices at subkelvin temperatures, which are relevant to quantum technologies
Photonic negative differential thermal conductance enabled by NIS junctions
No full textDue to their sensitivity to temperature variations, normal metal–insulator-superconductor (NIS) junctions are utilized in various thermal devices. This study illustrates that two NISIN reservoirs can achieve a measurable negative differential thermal conductance (NDTC). This phenomenon is enabled by photon-mediated heat exchange, which is profoundly affected by the temperature-dependent impedance matching between the reservoirs. Under suitable configurations, the heat current is suppressed for increasingly large temperature gradients, resulting in NDTC. We also propose experimental configurations that allow for the unambiguous discrimination of this effect. We employ superconducting aluminum in conjunction with either silver or epitaxial InAs to facilitate the experimental observation of NDTC at low temperatures over significant sub-Kelvin ranges. This advances the development of devices that exploit NDTC to enhance the regulation of heat and temperature in cryogenic environments, such as thermal switches, transistors, and amplifiers
Cryogenic behavior of high-permittivity gate dielectrics : the impact of atomic layer deposition temperature and the lithographic patterning method
No full textDielectrics featuring a high relative permittivity, i.e., high-k dielectrics, have become the standard insulators in gate architectures, enhancing the electrical performance of both room temperature and cryogenic electronics. This study delves into the cryogenic (3 K) performance of high-k dielectrics commonly used as gate insulators. We fabricated Al2O3 and HfO2 layers via atomic layer deposition (ALD) and extrapolated relative permittivity (k) and dielectric strength (EBD) from AC (100 Hz-100 kHz) and DC measurements on metal-insulator-metal capacitors. Our findings reveal a strong dependence of HfO2 cryogenic performance on ALD growth temperature, while the latter shows a negligible impact on Al2O3. We estimated similar to 9% and similar to 14% reductions in the relative permittivities of HfO2 and Al2O3, respectively, at temperatures from 300 to 3 K. Additionally, we designed and fabricatedAl(2)O(3)/HfO2 bilayers and checked their properties at cryogenic temperatures. The study also investigates the impact of the patterning method, namely, UV or electron-beam lithography (acceleration voltage of 10, 20, or 30 kV), on the high-k dielectric properties. (c) 2025 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license(https://creativecommons.org/licenses/by/4.0/)
Gate Control of the Current–Flux Relation of a Josephson Quantum Interferometer Based on Proximitized Metallic Nanojuntions
No full textWe demonstrate an Al superconducting quantum interference device in which the Josephson junctions are implemented through gate-controlled proximity Cu mesoscopic weak links. This specific kind of metallic weak links behaves analogously to genuine superconducting metals in terms of the response to electrostatic gating and provides a good performance in terms of current-modulation visibility. We show that through the application of a static gate voltage we can modify the interferometer current–flux relation in a fashion that seems compatible with the introduction of π-channels within the gated weak link. Our results suggest that the microscopic mechanism at the origin of the suppression of the switching current in the interferometer is apparently phase coherent, resulting in an overall damping of the superconducting phase rigidity. We finally tackle the performance of the interferometer in terms of responsivity to magnetic flux variations in the dissipative regime and discuss the practical relevance of gated proximity-based all-metallic SQUIDs for magnetometry at the nanoscale
Extremely weak sub-Kelvin electron-phonon coupling in InAs on Insulator
No full textWe are proposing a hybrid superconductor-semiconductor platform using indium arsenide (InAs) grown on an insulating layer of indium aluminum arsenide heterostructure (InAsOI) as an ideal candidate for coherent caloritronic devices. These devices aim to heat or cool electrons out of equilibrium with respect to the phonon degree of freedom. However, their performances are usually limited by the strength of the electron-phonon (e-ph) coupling and the associated power loss. Our work discusses the advantages of the InAsOI platform, which are based on the significantly low e-ph coupling measured compared to all-metallic state-of-the-art caloritronic devices. Our structure demonstrates values of the e-ph coupling constant up to two orders of magnitude smaller than typical values in metallic structures
A surface-acoustic-wave-based cantilever bio-sensor
No full textA scalable surface-acoustic-wave- (SAW-) based cantilevered device for portable bio-chemical sensing applications is presented. Even in the current, proof-of-principle implementation this architecture is shown to outperform commercial quartz-crystal microbalances in terms of sensitivity. Adhesion of analytes on a functionalized surface of the cantilever shifts the resonant frequency of a SAW-generating transducer due to the stress-induced variation of the speed of surface acoustic modes. We discuss the relevance of this approach for diagnostics applications based on miniaturized devices
Comparison of Solid-Phase Extraction and Micro-Solid-Phase Extraction for Liquid Chromatography/Mass Spectrometry Analysis of Pesticides in Water Samples
No full textField-Effect Controllable Metallic Josephson Interferometer
No full textGate-tunable Josephson junctions (JJs) are the backbone of superconducting classical and quantum computation. Typically, these systems exploit low-charge-concentration materials and present technological difficulties limiting their scalability. Surprisingly, electric field modulation of a supercurrent in metallic wires and JJs has been recently demonstrated. Here, we report the realization of titanium-based monolithic interferometers which allow tuning both JJs independently via voltage bias applied to capacitively coupled electrodes. Our experiments demonstrate full control of the amplitude of the switching current (Is) and of the superconducting phase across the single JJ in a wide range of temperatures. Astoundingly, by gate-biasing a single junction, the maximum achievable total Is is suppressed down to values much lower than the critical current of a single JJ. A theoretical model including gate-induced phase fluctuations on a single junction accounts for our experimental findings. This class of quantum interferometers could represent a breakthrough for several applications such as digital electronics, quantum computing, sensitive magnetometry, and single-photon detection
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