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Unveiling multimodal hot carrier excitation in plasmonic bimetallic Au@Ag nanostars for photochemistry and SERS sensing

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Nano Research 2024年第12期17卷 10355-10362页

作者： Yoel Negrín-Montecelo Amir Elsaidy Jesús Giráldez-Martínez Enrique Carbó-Argibay Zhiming Wang Alexander O.Govorov Ramon A.Alvarez-Puebla miguel A.Correa-Duarte Lucas V.Besteiro Department of Physical and Inorganic Chemistry Universitat Rovira i VirgiliCarrer de Marcel∙líDomingo s/nTarragona 43007Spain Department of chemical engineering Military Technichal CollegeCairo 4393010Egypt CINBIO University of VigoCampus Universitario de VigoLagoas MarcosendeVigo 36310Spain International Iberian Nanotechnology Laboratory Av.Mestre JoséVeiga s/nBraga 4715-330Portugal Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Department of Physics and Astronomy Ohio UniversityAthensOhio 45701USA ICREA Passeig Lluís Companys 23Barcelona 08010Spain Southern Galicia Institute of Health Research(IISGS)and Biomedical Research Networking Center for Mental Health(CIBERSAM) Universidade de VigoVigo 36310Spain

Plasmonic nanostructures stand at the forefront of nanophotonics research,particularly in sensing and energy conversion *** unique ability to confine light energy at the nanoscale makes them indispensable for a wide array of technological *** study of these structures often makes use of different materials and,even more extensively,explores new shapes and configurations to extend our common repertoire of useful nanophotonics *** the creation of bimetallic plasmonic nanostructures combines these two dimensions determining the space of possible plasmonic resonators and opens the possibility of tailoring systems with behavior unavailable to single-metal plasmonic *** this paper,we delve into the exploration of bimetallic systems employing plasmonic *** structures have demonstrated remarkable capabilities for surface-enhanced Raman scattering(SERS)spectroscopy and photochemistry,due to the strong plasmonic response of their peaks,whose disposition following a spherical symmetry makes them largely polarization-and ***,we report the colloidal synthesis of two different water-stable Au@Ag nanostars,explore their performance as photocatalysts and SERS substrates,and provide an in-depth account of their non-trivial physical response.

关键词： hot-electrons field enhancement nanohybrids photocatalysis surface-enhanced Raman scattering(SERS) plasmonics

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Non-linear modeling of kinetic and equilibrium data for the adsorption of hexavalent chromium by carbon nanomaterials:Dimension and functionalization

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Chinese Journal of Chemical Engineering 2019年第4期27卷 912-919页

作者： miguel de la Luz-Asunción Eduardo E.Pérez-Ramírez Ana L.Martínez-Hernández Victor M.Castano Víctor Sánchez-Mendieta Carlos Velasco-Santos Facultad de Quimica Universidad Autonoma del Estado de Mexico Km. 12 de la carretera Toluca-Atlacomulco C.P. 50200 San Cayetano Toluca Estado de Mexico Mexico Tecnologico Nacional de Mexico-Instituto Tecnologico de Queretaro Division de Estudios de Posgrado e Investigacion Av. Tecnologico s/n esq. GraL Mariano Escobedo Col. Centro Historico C.P. 76000 Santiago de Queretaro Queretaro Mexico Centro de Fisica Aplicada y Tecnologia Avanzada Universidad Nacional Autonoma de Mexico Boulevard Juriquilla 3001 Queretaro 76230 Mexico

The adsorption capacities for the removal of hexavalent chromium from aqueous solutions by six carbon nanomaterials have been evaluated. Single-walled and multi-walled carbon nanotubes as received and after oxidation treatment, graphene oxide and reduced graphene oxide are the materials with different dimension and functionalization compared in this research. Carbon nanotubes have been modified using hydrogen peroxide as oxidizing agent under microwave radiation. The oxidation treatment on carbon nanotubes has a positive effect increasing the adsorbent–adsorbate interaction. Rate-controlling mechanisms and equilibrium data are analyzed using non-linear models. Non-linear method is proposed as the most suitable method for determining the kinetic and equilibrium parameters. The values of adsorption energy(E) obtained from the Dubinin–Radushkevich isotherm,have been found around 0.371 and 0.870 k J·mol-1, indicating physical adsorption. Therefore, the pseudo-second order model represents better the kinetic experimental data. The results show that the Langmuir isotherm provides a slightly better fit to the experimental data compared with the Freundlich isotherm, indicating homogeneous distribution of active sites on carbon nanomaterials and monolayer adsorption. The separation factors RLare found in the range of 0–1, suggesting that the adsorption process is suitable for all adsorbents. The mechanisms for hexavalent chromium removal have been proposed as electrostatic interactions and hydrogen bonding.

关键词： Carbon nanotubes Graphene Adsorption Hexavalent chromium Kinetic

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In-plane transversal normal stresses in the concrete face of CFRD induced by the first-dam reservoir filling

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Frontiers of Structural and Civil Engineering 2018年第1期12卷 81-91页

作者： Neftali SARMIENTO-SOLANO miguel P. ROMO l Institute of Engineering National University of Mexico Mexico City 0451 O Mexico

To evaluate the effects of dam height, valley narrowness and width of concrete slabs on the first-dam reservoir filling in-plane transversal normal stresses in the concrete face of CFRD＇s, 3D finite difference analyses were carried out. Behavior of rockfiU dams considered in this study was defined from the monitoring of a number of 3D sets of pressure cells and extensometers installed in three large dams in Mexico. The 3D analyses results show that high in-plane transversal compressive stresses develop within the concrete panels located in the central concrete face zone upon dam reservoir filling loading. Likewise, in-plane induced tensile transversal stresses in the zones near the abutments increase the potential of slabs cracking and damaging the waterstops in-between the vertical and perimetral joints. From the results of the 3D finite difference analyses, a simple method to estimate in-plane normal stresses in the concrete face is advanced and through comparisons with the results of a 3D case numerical study, its accuracy assessed.

关键词： concrete face CFR dams reservoir filling slab in-plane stresses

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Dynamic in-plane transversal normal stresses in the concrete face of CFRD

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Frontiers of Structural and Civil Engineering 2019年第1期13卷 135-148页

作者： Neftali SARMIENTO-SOLANO miguel P.ROMO Institute of Engineering National University of MexicoMexico City04510Mexico

Severe earthquakes can induce damages to Concrete Face Rocldill Dams (CFRDs)such as concrete cracking and joint's water stops distressing where high in-plane transversal normal stresses *** these damages rarely jeopardize the dam safety,they cause large water reservoir leakages that hinder the dam *** issue can be addressed using well know numerical methods;however,given the wide range of parameters involved,it would seem appropriate to develop a simple yet reliable procedure to get a close understanding how their interaction affects the CFRD's overall ***,once the physics of the problem is better understood one can proceed to perform a detailed design of the various components of the *** this end an easy-to-use procedure that accounts for the dam height effects,valley narrowness,valley slopes,width of concrete slabs and seismic excitation characteristics was *** procedure is the dynamic complement of a method recently developed to evaluate in-plane transversal normal stresses in the concrete face of CFRD's due to dam reservoir filling [1].Using these two procedures in a sequential manner,it is possible to define the concrete slab in-plane normal stresses induced by the reservoir filling and the action of orthogonal horizontal seismic excitations acting at the same time upstream-downstream and cross *** procedures were developed from a data base generated using nonlinear static and dynamic three-dimensional numerical analyses on the same group of CFRD'***,the results were interpreted with the Buckingham Pi theorem and various relationships were *** the above reference,the method to evaluate the concrete face in-plane transversal normal stresses caused by the first reservoir filling was *** this paper,the seismic procedure is first developed and then through an example the whole method (dam construction,reservoir filling plus seismic loading)of analysis is assessed.

关键词： CFR dams dynamic analysis in-plane normal stresses concrete face

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Endotoxin-induced alterations of adipose tissue function:a pathway to bovine metabolic stress

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Journal of Animal Science and Biotechnology 2024年第4期15卷 1391-1407页

作者： miguel Chirivi G.Andres Contreras Department of Large Animal Clinical Sciences Michigan State UniversityEast LansingMIUSA

During the periparturient period, dairy cows exhibit negative energy balance due to limited appetite and increased energy requirements for lactogenesis. The delicate equilibrium between energy availability and expenditure puts cows in a state of metabolic stress characterized by excessive lipolysis in white adipose tissues(AT), increased production of reactive oxygen species, and immune cell dysfunction. Metabolic stress, especially in AT, increases the risk for metabolic and inflammatory diseases. Around parturition, cows are also susceptible to endotoxemia. Bacterial-derived toxins cause endotoxemia by promoting inflammatory processes and immune cell infiltration in different organs and systems while impacting metabolic function by altering lipolysis, mitochondrial activity, and insulin sensitivity. In dairy cows, endotoxins enter the bloodstream after overcoming the defense mechanisms of the epithelial barriers, particularly during common periparturient conditions such as mastitis, metritis, and pneumonia, or after abrupt changes in the gut microbiome. In the bovine AT, endotoxins induce a pro-inflammatory response and stimulate lipolysis in AT, leading to the release of free fatty acids into the bloodstream. When excessive and protracted, endotoxin-induced lipolysis can impair adipocyte's insulin signaling pathways and lipid synthesis. Endotoxin exposure can also induce oxidative stress in AT through the production of reactive oxygen species by inflammatory cells and other cellular components. This review provides insights into endotoxins' impact on AT function, highlighting the gaps in our knowledge of the mechanisms underlying AT dysfunction, its connection with periparturient cows' disease risk, and the need to develop effective interventions to prevent and treat endotoxemia-related inflammatory conditions in dairy cattle.

关键词： Adipose tissue dysfunction Endotoxin Inflammation Insulin resistance

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The Immersed Interface Method for Simulating Two-Fluid Flows

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Numerical Mathematics(Theory,Methods and Applications) 2014年第4期7卷 447-472页

作者： miguel Uh Sheng Xu Department of Mathematics Southern Methodist UniversityDallasTX 75275-0156USA

We develop the immersed interface method(IIM)to simulate a two-fluid flow of two immiscible fluids with different density and *** to the surface tension and the discontinuous fluid properties,the two-fluid flow has nonsmooth velocity and discontinuous pressure across the moving sharp interface separating the two *** IIM computes the flow on a fixed Cartesian grid by incorporating into numerical schemes the necessary jump conditions induced by the *** present how to compute these necessary jump conditions from the analytical principal jump conditions derived in[Xu,DCDS,Supplement 2009,pp.838-845].We test our method on some canonical two-fluid *** results demonstrate that the method can handle large density and viscosity ratios,is second-order accurate in the infinity norm,and conserves mass inside a closed interface.

关键词： Immersed interface method two-fluid flows jump conditions augmented variable approach singular force Cartesian grid methods

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Tau's function and dysfunction in the brain:when small changes have big consequences

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Neural Regeneration Research 2024年第1期19卷 152-153页

作者： miguel Portillo Debra Toiber Department of Life Sciences Ben-Gurion University of the NegevBeer ShevaIsraelThe Zlotowski Center for NeuroscienceBen-Gurion University of the NegevBeer ShevaIsrael

With the increase of life expectancy and population growth,neurodegenerative diseases have risen too and are projected to be a major health public concern by *** diseases are characterized by the progressive decline of cognitive function leading to the subsequent loss of *** the underlying causes of neurodegeneration are not well understood,aging is the main risk factor.

关键词： diseases consequences function

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Analysis of the impact of large scale seismic retrofitting strategies through the application of a vulnerability-based approach on traditional masonry buildings

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Earthquake Engineering and Engineering Vibration 2017年第2期16卷 329-348页

作者： Tiago miguel Ferreira Rui Maio Romeu Vicente ISISE Department of Civil EngineeringUniversity of MinhoCampus de Azurém RISCO Department of Civil EngineeringUniversity of AveiroCampus Universitário de Santiago

The buildings＇ capacity to maintain minimum structural safety levels during natural disasters, such as earthquakes, is recognisably one of the aspects that most influence urban resilience. Moreover, the public investment in risk mitigation strategies is fimdamental, not only to promote social and urban and resilience, but also to limit consequent material, human and environmental losses. Despite the growing awareness of this issue, there is still a vast number of traditional masonry buildings spread throughout many European old city centres that lacks of adequate seismic resistance, requiring therefore urgent retrofitting interventions in order to both reduce their seismic vulnerability and to cope with the increased seismic requirements of recent code standards. Thus, this paper aims at contributing to mitigate the social and economic impacts of earthquake damage scenarios through the development of vulnerability-based comparative analysis of some of the most popularretrofitting techniques applied after the 1998 Azores earthquake. The influence of each technique individually and globally studied resorting to a seismic vulnerability index methodology integrated into a GIS tool and damage and loss scenarios are constructed and critically discussed. Finally, the economic balance resulting from the implementation of that techniques are also examined.

关键词： urban resilience masonry buildings retrofitting strategies vulnerability-based approach loss estimation

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Observation of performance measures of STEMI in elderly after implementation of an updated protocol:results from a single center without coronary interventions

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Journal of Geriatric Cardiology 2022年第11期19卷 930-936页

作者： miguel Rodríguez-Ramos General Hospital Camilo Cienfuegos Bartolome Maso and Mirto Streets Sancti SpiritusCuba

As life expectancy increases,heart conditions,and especially acute coronary syndromes(ACS),are becoming a greater health issue.[1-3]Accordingly,the number of elderly patients in registries of myocardial infarction,is increasingly growing.[4,5]However,elderly patients are less likely to be treated with invasive strategy compared to younger patients,despite their intrinsic greater risk.[6,7]Several reports have described how quality initiatives improve treatment of ST elevation myocardial infarction(STEMI).

关键词： coronary STEMI Observation

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Software Project Effort Estimation Based on Multiple Parametric Models Generated Through Data Clustering

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Journal of Computer Science & Technology 2007年第3期22卷 371-378页

作者： Juan J.Cuadrado Gallego Daniel Rodríguez miguel Angel Sicilia miguel Garre Rubio Angel García Crespo Department of Computer Science The University of Alcalá AlcaláSpain Department of Computer Science Carlos Ⅲ University.Madrid Spain

Parametric software effort estimation models usually consists of only a single mathematical relationship. With the advent of software repositories containing data from heterogeneous projects, these types of models suffer from poor adjustment and predictive accuracy. One possible way to alleviate this problem is the use of a set of mathematical equations obtained through dividing of the historical project datasets according to different parameters into subdatasets called partitions. In turn, partitions are divided into clusters that serve as a tool for more accurate models. In this paper, we describe the process, tool and results of such approach through a case study using a publicly available repository, ISBSG. Results suggest the adequacy of the technique as an extension of existing single-expression models without making the estimation process much more complex that uses a single estimation model. A tool to support the process is also presented. Keywords software engineering, software measurement, effort estimation, clustering

关键词： software engineering software measurement effort estimation clustering

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