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Quantum-mechanical effects in photoluminescence from thin crystalline gold films

Light(Science & Applications) 2024年第4期13卷 783-794页

作者： Alan R.Bowman alvaro.rodríguez echarri Fatemeh Kiani Fadil Iyikanat Ted V.Tsoulos Joel D.Cox Ravishankar Sundararaman F.Javier García de Abajo Giulia Tagliabue Laboratory of Nanoscience for Energy Technologies(LNET) STIÉcole Polytechnique Fédérale de Lausanne(EPFL)LausanneSwitzerland ICFO–Institut de Ciencies Fotoniques The Barcelona Institute of Science and TechnologyCastelldefels(Barcelona)Spain. MBI–Max-Born-Institut BerlinGermany. POLIMA–Center for Polariton-driven Light–Matter Interactions University of Southern DenmarkOdense MDenmark. Danish Institute for Advanced Study University of Southern DenmarkOdense MDenmark. Department of Materials Science&Engineering Rensselaer Polytechnic InstituteTroyNYUSA. Department of Physics Applied Physicsand AstronomyRensselaer Polytechnic InstituteTroyNYUSA. ICREA–Institucio Catalana de Recerca i Estudis Avancats BarcelonaSpain

Luminescence constitutes a unique source of insight into hot carrier processes in metals,including those in plasmonic nanostructures used for sensing and energy ***,being weak in nature,metal luminescence remains poorly understood,its microscopic origin strongly debated,and its potential for unraveling nanoscale carrier dynamics largely ***,we reveal quantum-mechanical effects in the luminescence emanating from thin monocrystalline gold ***,we present experimental evidence,supported by first-principles simulations,to demonstrate its photoluminescence origin(i.e.,radiative emission from electron/hole recombination)when exciting in the interband *** model allows us to identify changes to the measured gold luminescence due to quantum-mechanical effects as the gold film thickness is ***,such effects are observable in the luminescence signal from flakes up to 40 nm in thickness,associated with the out-of-plane discreteness of the electronic band structure near the Fermi *** qualitatively reproduce the observations with first-principles modeling,thus establishing a unified description of luminescence in gold monocrystalline flakes and enabling its widespread application as a probe of carrier dynamics and light-matter interactions in this *** study paves the way for future explorations of hot carriers and charge-transfer dynamics in a multitude of material systems.

关键词： luminescence quantum crystalline

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Thermal Analysis and Experimental Validation of Parabolic Trough Collector for Solar Adsorption Refrigerator

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Energy and Power Engineering 2017年第11期9卷 687-702页

作者： Mariella Mateo Rodolfo echarri Inna Samsón Laboratorio de Energías Alternativas Instituto Tecnológico de Santo Domingo Santo Domingo Dominican Republic Instituto del Desarrollo Humano Universidad Nacional de General Sarmiento Buenos Aires Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Buenos Aires Argentina

This work presents an algorithm able to simulate the heating of a solar collector throughout the day. The discussed collector is part of a solar adsorption refrigerator, and is used to regenerate the activated carbon contained inside a cylindrical recipient (absorber), which is located in the focal line of a parabolic trough concentrator. The developed algorithm takes into account all the transfer mechanisms when analyzing the heat transfers taking place between the collector’s components and the environment, as well as the transfer mechanisms towards the absorber’s interior. The temperature evolution for the collector’s elements is obtained, and the model is validated by comparing the experimentally measured surface temperature of the absorber with the one determined by the algorithm. The experimental data were gathered from similar collectors in two different scenarios: Santo Domingo (Dominican Republic) and Buenos Aires (Argentina). The model is satisfactorily validated with experimental data.

关键词： Mathematical Model Heat Transfer Parabolic Trough Collector Solar Adsorption Refrigerator

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Dynamic Simulation of Absorber for Solar Adsorption Refrigerator: A Validated Numerical Model

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Energy and Power Engineering 2017年第8期9卷 464-477页

作者： Rodolfo echarri Inna Samsón Andrei Gariaev Andrés Sartarelli Instituto del Desarrollo Humano Universidad Nacional de General Sarmiento Buenos Aires Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Buenos Aires Argentina Laboratorio de Energías Alternativas Instituto Tecnológico de Santo Domingo Santo Domingo Dominican Department of Heat and Mass Transfer Processes and Systems Moscow Power Engineering Institute Moscow Russia

In this work, a numerical model is presented that describes the transfer of heat and mass inside a cylindrical regenerator of a solar adsorption refrigerator that uses the methanol/activated-carbon refrigerant pair. This model is based on the equations of mass conservation, energy conservation, Darcy’s law and the balance model between sorbate and sorbent given by the Dubinin-Astak- hov’s equation. On the other hand, the linear driving force (LDF) model is used to describe the rate of desorption. In the developed model, the spatial variation of methanol vapor pressure within the activated carbon bed is taken into account and, as one of the boundary conditions, the temperature is used at the external surface of the absorber measured experimentally along the day. Using the developed model, the temperature, pressure and concentration of methanol were calculated;both inside the grains of carbon and in the space between the grains, as a function of time. The algorithm was validated comparing the numerical results with the experimental data, obtaining a satisfactory concordance.

关键词： Adsorption Solar Ice Maker Methanol Activated Carbon

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Spanish National Monuments with Traditional Timber Roofs： Restoration versus Reconstruction

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Journal of Civil Engineering and Architecture 2011年第9期5卷 828-834页

作者： Javier Garabito Jose Carlos Garabito Victor echarri Angel rodriguez Jesus Gadea Veronica Calderon Department of Building Construction University of Burgos Spain Department of Civil Engineering University of Burgos Spain Department of Building Construction University of Alicante Spain

We prioritize interventions in the roof structure in order to prevent subsequent deterioration of the monument. This presentation refers to interventions in two Spanish National Monuments： the Collegiate Church of Roa de Duero and San Esteban＇s church of Los Balbases. The Collegiate Church was built during the 16th century. It is considered the jewel of the villa. It is a ＂hallenkirche＂ model with three big naves of the same height covered by beautiful starry vaults. The intervention consisted of restoring the wooden roof structure, preserving the original 16th centary structure, by replacing the damaged elements. It was restored according to archaeological criteria. San Esteban＇s church is a 13 century Gothic style church with a Latin cross plan. It has three naves with a transept of great slenderness. It preserves Romanesque remains. Opposite to the previous intervention we decided to rebuild the roof because the former roof was totally distorted due to bad executed works during the past Century. In this way we regain the original shape of the church. These interventions aim to improve constructive and structural conditions as well as retrieve the image of both monuments. We have studied the visual impact of interventions through virtual recreations. The intervention criteria are very different, restoration versus structttral reconstruction.

关键词： Restoration roof timber structure heritage laminated wood.

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Generating a 3D Tool to Represent Graphically the Damages of Santa Barbara Castle （Alicante）

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Journal of Civil Engineering and Architecture 2012年第2期6卷 197-203页

作者： Victor echarri A. B. Gonzalez Aviles J. Garabito M. I. Perez Millan A. Priego Department of Building Constructions University of Alicante University of Burgos Spain

Santa Barbara castle is one of the largest fortified complexes of the Spanish Mediterranean coast. Set in a strategic enclave in the city of Alicante. It has been transformed over the centuries since its origin, so that nowadays includes numerous buildings inside its area. The fortified area contains several lines bastioned and some medieval and Muslim fronts, composed of quadrangular towers. During the years 2007 and 2008, a research team composed of members from the University of Alicante, the University of Burgos and the Polytechnic University of Catalonia has developed a study on the conservation status of the Castle. This study has been funded through research grants from thc Genemlitat Valenciana （Project GV reference 2007/150）, and an agreement with Manuel PeIAez Foundation. We have generated a 3D object of the whole, composed by clouds of millions points, through laser-scanner in order to manage the analysis of the architectural element＇s conservation status that make up the huge fortified complex. This tool reduced greatly the architectural survey work, providing an extremely accurate. They were developed through the program Pointools View, generating JPEG files, which were imported from Autocad. Later we undertook a comprehensive making of photos -- some 7,000 photographs, which we linked to the 3D object. Thus we have immediate access to the photographs of each element of the Castle from the program Pointools View with a simple click on each 3D element. The graphic representation of damages was done on screen with programs Pointools View and Autocad open simultaneously. This technique has meant better accuracy in the study of conservation status and has greatly reduced the time commitment.

关键词： Laser-scanner Santa Barbara Castle graphic representation of damages Heritage Management.

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