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Tribologically induced nanostructural evolution of carbon materials: A new perspective

Friction 2024年第1期12卷 144-163页

作者： Guilherme Oliveira NEVES nicol.s ARAYA Diego Berti SALVARO Thiago de souza LAMIM Renan Oss GIACOMELLI Cristiano BINdeR Aloisio Nelmo KLEIN JoséDaniel Biasoli de MELLO Laboratório de Materiais Universidade Federal de Santa CatarinaSanta Catarina 88040-900Brazil departamento de Ingeniería Mecánica Facultad de IngenieríaUniversidad del Bío-BíoConcepcion 4070-386Chile Universidad de Concepción Concepcion 4070-386Chile SENAI Innovation Institute for Laser Processing Santa Catarina 89218-153Brazil Universidade Federal de Uberlândia Minas Gerais 38408-100Brazil

Carbon-based solid lubricants are excellent options to reduce friction and wear,especially with the carbon capability to adopt different allotropes *** the macroscale,these materials are sheared on the contact along with debris and contaminants to form tribolayers that govern the tribosystem *** a recently developed advanced Raman analysis on the tribolayers,it was possible to quantify the contactinduced defects in the crystalline structure of a wide range of allotropes of carbon-based solid lubricants,from graphite and carbide-derived carbon particles to multi-layer graphene and carbon *** addition,these materials were tested under various dry sliding conditions,with different geometries,topographies,and solid-lubricant application *** of the initial tribosystem conditions and allotrope level of atomic ordering,there is a remarkable trend of increasing the point and line defects density until a specific saturation limit in the same order of magnitude for all the materials tested.

关键词： carbon nanostructures tribology Raman spectroscopy defects quantification tribolayer solid lubrication

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Optimal photonic indistinguishability tests in multimode networks

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Science Bulletin 2018年第22期63卷 1470-1478页

作者： Niko Viggianiello Fulvio Flamini Marco Bentivegna nicol. Spagnolo Andrea Crespi Daniel J.Brod Ernesto F.Galvao Roberto Osellame Fabio Sciarrino Dipartimento di Fisica Sapienza Universitadi RomoPiazzale Aldo Moro 51-00185RomaItaly Istituto di Fotonica e Nanotecnologie Consiglio Nazionale delle Ricerche (IFN-CNR)Piazza Leonardo da Vinci321-20133 MilanoItaly Diportimento di Fisica Politecnico di MilanoPiazza Leonardo da Vinci321-20133 MilanoItaly Perimeter Institute for Theoretical Physics 31 Caroline Street NorthWaterlooON N2L 2Y5Canada Instituto de Pisica Universidade Federal FluminenseAv.Gal.Milton Tavares de Souza s/nNiteroiRJ 24210-340Brazil

Particle indistinguishability is at the heart of quantum statistics that regulates fundamental phenomena such as the electronic band structure of solids, Bose-Einstein condensation and ***, it is necessary in practical applications such as linear optical quantum computation and simulation, in particular for Boson Sampling *** is thus crucial to develop tools to certify genuine multiphoton interference between multiple *** approach employs the total variation distance to find those transformations that minimize the error probability in discriminating the behaviors of distinguishable and indistinguishable *** particular, we show that so-called Sylvester interferometers are near-optimal for this *** using Bayesian tests and inference, we numerically show that Sylvester transformations largely outperform most Haar-random unitaries in terms of sample size ***, we experimentally demonstrate the efficacy of the transformation using an efficient 3 D integrated circuits in the single-and multiple-source *** then discuss the extension of this approach to a larger number of photons and *** results open the way to the application of Sylvester interferometers for optimal assessment of multiphoton interference experiments.

关键词： Particle indistinguishability Quantum statistics Optical quantum computation Quantum simulation Sylvester interferometers Bayesian tests Multiphoton interference experiments

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