Luciano Machado

Instituto de Geociencias

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Dimitris C. Lagoudas

Texas A&M University

Marcelo A. Savi

Universidade Federal do Rio de Janeiro

Marcelo de Araújo Carvalho

Universidade Federal do Rio de Janeiro

Robson Tadeu Bolzon

Universidade Federal do Paraná

Ismar de Souza Carvalho

Universidade Federal do Rio de Janeiro

Luiz Fillipe Adão

Leonardo de Oliveira Santos

Brazilian Development Bank

Lorenzo Luini

Politecnico di Milano

C. Capsoni

Politecnico di Milano

Vitor Paiva Pimentel

Contextual Change (United States)

Cooperative Institutions

Universidade Federal do Rio de Janeiro

Brazilian Development Bank

Instituto de Geociencias

Universidade do Estado do Rio de Janeiro

Texas A&M University

Mitchell Institute

University of Coimbra

Secretaria de Planejamento e Gestão

Centre National de la Recherche Scientifique

College Station Medical Center

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BNDES e emprego

Leonardo de Oliveira Santos Luciano Machado Roberto de Oliveira Pereira

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Citations (1)

Nonlinear dynamics of a SMA passive vibration damping device

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2006)

Luciano Machado Dimitris C. Lagoudas

This work investigates numerically and experimentally the nonlinear vibration of a Shape Memory Alloy (SMA)passive damping vibration device, where the main elements are pseudoelastic SMA wires. At first, a one-degree of freedom SMA oscillator, composed of a mass balanced by two pseudoelastic SMA wires, where the configuration was based on the SMA passive damping vibration device, was considered. A thermomechanical constitutive model, based on the thermodynamic framework proposed by Boyd and Lagoudas, was used to predict the constitutive behavior of the SMA wires. The mechanical model was supplemented by simple heat transfer analysis, so that temperature variations caused by martensitic phase transformation and the effect of different frequency responses could be investigated. Numerical simulations of transmissibility curves and temperature variations of SMA oscillator are correlated with experimental results obtained from vibration sine sweep tests.

Pseudoelasticity

Transmissibility (structural dynamics)

Sine wave

10.1117/12.658062

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Citations (10)

Lenhos fósseis do Neógeno da Bacia do Acre, Formação Solimões: contexto paleoambiental

Revista Brasileira de Geociências (2012)

Luciano Machado Rita Scheel-Ybert Robson Tadeu Bolzon Marcelo de Araújo Carvalho Ismar de Souza Carvalho

This paper discusses the study of fossil wood collected along the banks of Acre, Furnaia, Juruá, Purus and Moa rivers, located in the outcrops of Solimões Formation (Upper Miocene), Acre Basin. The anatomical and morphological description of the cellular structures was accompanied by inferences about the preservation of the woods constituent elements, aiming to bring together taphonomic data and palaeoenvironmental regional parameters. The results indicate silica as the major component of the fossils, also occurring inclusions of iron oxides. The group of anatomical features includes vessels of medium (100 to 200 µm) to large (≥ 200 µm) diameter, with a predominance of solitary vessels, few vessels per square millimeter and simple perforation plates. The presence of these characters enabled to infer a tropical climate in Acre at the late Miocene. The presence of growth rings and vessels trending to semi-porosity suggests a variation in water availability, which indicates a seasonal climate with a dry season. The palynological record found in the literature indicates a palaeovegetation with the presence of freshwater lakes and tropical marshes. Permanent water bodies (wetlands, shallow lakes) were frequent during the deposition of the Solimões Formation, indicating that the Amazon south-western basin acted as a plane basin, similar to the system of the modern Pantanal, but fed by the Andes. The fossil woods have affinity with the recent botanical families Caesalpinioideae (Fabaceae), Lythraceae and Myrtace, which can be related to this palaeoenvironment.

Outcrop

Taphonomy

10.25249/0375-7536.20124216780

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Citations (4)

Data attached to Radio Science paper "Model to Scale Rain Attenuation Time Series with Link Elevation Angle for LEO Satellite Based Systems"

Zenodo (CERN European Organization for Nuclear Research) (2023)

Lorenzo Luini Luciano Machado C. Capsoni

Data attached to Radio Science paper "Model to Scale Rain Attenuation Time Series with Link Elevation Angle for LEO Satellite Based Systems"

Elevation (ballistics)

Elevation angle

Link (geometry)

10.5281/zenodo.7504219

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Nonlinear dynamics and chaos in a shape memory alloy pseudoelastic oscillator

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2007)

Luciano Machado Dimitris C. Lagoudas Marcelo A. Savi

Shape memory alloys (SMAs) have been used in different kind of application including those that explore their dynamical response. The key characteristics of SMAs are associated with adaptive dissipation related to their hysteretic behavior and changes in their material properties caused by martensitic phase transformations. This work discusses the dynamical response of one-degree of freedom (1-DOF) oscillator where the restitution force is provided by an SMA pseudoelastic element described by a smooth constitutive model built upon the Boyd- Lagoudas model. Numerical simulations show a very intricate dynamic response of the system, with even chaotic responses. Nonlinear tools are employed to determine the nature of the system motion and Lyapunov exponents are used to assure conclusions concerning chaotic behavior.

Pseudoelasticity

10.1117/12.715812

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Citations (7)

Medical applications of shape memory alloys

Brazilian Journal of Medical and Biological Research (2003)

Luciano Machado Marcelo A. Savi

Shape memory alloys (SMA) are materials that have the ability to return to a former shape when subjected to an appropriate thermomechanical procedure. Pseudoelastic and shape memory effects are some of the behaviors presented by these alloys. The unique properties concerning these alloys have encouraged many investigators to look for applications of SMA in different fields of human knowledge. The purpose of this review article is to present a brief discussion of the thermomechanical behavior of SMA and to describe their most promising applications in the biomedical area. These include cardiovascular and orthopedic uses, and surgical instruments.

Pseudoelasticity

10.1590/s0100-879x2003000600001

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Citations (497)

Sedimentacao Albo-Aptiana de particulas vegetais (Fitoclastos) em rochas do Membro Taquari, Formacao Rachuelo, Bacia de Sergipe, Brasil

Arquivos do Museu Nacional (Rio de Janeiro) (2005)

Marcelo de Araújo Carvalho David de Castro de Oliveira Luciano Machado Joao Graciano Mendonca-Filho

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Shape memory alloys for vibration isolation and damping

PhDT (2007)

Luciano Machado

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Citations (14)

Mobilidade ocupacional e incompatibilidade educacional no Brasil Metropolitano

Luciano Machado

O estudo procurou analisar a mobilidade ocupacional no mercado de trabalho metropolitano brasileiro nas seguintes modalidades: ascendente dos sobre-educados, descendente dos subeducados e os movimentos ascendente e descendente dos adequados, considerando fatores do lado da oferta e da demanda por trabalho. Para esse objetivo, foram utilizados os dados da PME no periodo 2002-2008, a fim de modelar as transicoes realizadas pelos individuos ocupados ao longo desse intervalo. A estrategia de identificacao adotada para as estimacoes exigiu a construcao de um pseudo-painel ao nivel de coortes. Particularmente, verificou-se como as condicoes ciclicas no mercado de trabalho, captadas pela taxa de desemprego, se relacionaram aos movimentos ascendente e descendente realizados a partir de situacoes de compatibilidade ou nao entre escolaridade demandada e ofertada na ocupacao. Foram enfocados efeitos de ciclos economicos, de composicao da oferta, de periodo e de coorte para explicar o comportamento das mobilidades consideradas.Os resultados mostraram que os ciclos observados pelos individuos no mercado de trabalho sao relevantes para suas decisoes de mobilidade ocupacional, impactando tanto o movimento ascendente quanto o descendente. Desse modo, as teorias que tem enfocado apenas nos atributos individuais para explicar o comportamento do mismatch ao longo do tempo deixam de levar em conta equivocadamente o papel dos ciclos economicos em facilitar ou nao o processo de compatibilizacao ocupacional em termos de escolaridade. Com relacao aos efeitos de coorte, obteve-se que as possibilidades de adequacao estao associadas aos estagios iniciais das carreiras dos individuos no mercado de trabalho, para os sobre e subeducados. O comportamento pro-ciclico da mobilidade ascendente dos sobre-educados e uma evidencia explicita de que condicoes favoraveis no mercado de trabalho influenciam na compatibilidade dos trabalhadores nas ocupacoes. O fato de a taxa de desemprego afetar as decisoes de mobilidade impacta tambem a duracao da sobre-educacao no mercado de trabalho, de modo que essa situacao ocupacional pode ter caracteristicas de curto ou longo prazo dependendo do comportamento ciclico da economia.

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Orientación profesional: la necesaria renovación conceptual y reorganización política

Luciano Machado

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