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Search Results: 1 - 10 of 4385 matches for " Luciano Pessanha;Hemerly "
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Modeling, simulation and identification for control of tandem cold metal rolling
Alves, Péricles Guedes;Castro, José Adilson de;Moreira, Luciano Pessanha;Hemerly, Elder Moreira;
Materials Research , 2012, DOI: 10.1590/S1516-14392012005000137
Abstract: this paper describes a modeling procedure for tandem cold metal rolling, including the linearization step and system identification for control. the tandem cold rolling process is described by a mathematical model based on algebraic equations developed for control purposes and empirical relations. a state-space model is derived and detailed analyses in open loop are presented, concerning the sensitivity with regard to the variations in process parameters and results for the application of a new subspace identification method are compared with classical methodologies. therefore, this work intents to be a contribution for developments in new control strategies for tandem cold rolling process that offer the potential to reduce the design efforts, the commissioning time and maintenance in rolling mills. the preliminary results obtained with this model have shown reasonable agreement with operational data presented at literature for industrial cold rolling process.
Experimental analysis and theoretical predictions of the limit strains of a hot-dip galvanized interstitial-free steel sheet
Freitas, Maria Carolina dos Santos;Moreira, Luciano Pessanha;Velloso, Renata Garcez;
Materials Research , 2013, DOI: 10.1590/S1516-14392013005000015
Abstract: in this work, the formability of a hot-dip galvanized interstitial-free (if) steel sheet was evaluated by means of uniaxial tensile and forming limit curve (flc) tests. the flc was defined using the flat-bottomed marciniak's punch technique, where the strain analysis was made using a digital image correlation software. a plastic localization model was also proposed wherein the governing equations are solved with the help of the newton's method. the investigated hot-dip galvanized if steel sheet presented a very good formability level in the deep-drawing range consistent with the measured lankford values. the predicted limit strains were found to be in good agreement with the experimental data of the hot-dip galvanized if steel sheet owing to the definition of the localization model geometrical imperfection as a function of the experimental surface roughness evolution and, in particular, to the yield surface flattening near to the plane-strain stress state authorized by the adopted yield criterion.
Sensitivity analysis of the ECAE process via 2k experiments design
Medeiros, Neil de;Moreira, Luciano Pessanha;Bressan, José Divo;Lins, Jefferson Fabrício Cardoso;Gouvêa, Jayme Pereira de;
Matéria (Rio de Janeiro) , 2010, DOI: 10.1590/S1517-70762010000200018
Abstract: in this work the theoretical solutions based upon the upper-bound theorem recently proposed by pérez and luri [mech. mater. 40 (2008) 617] for the equal channel angular extrusion process (ecae) are analyzed by performing a 25 central composite factorial analysis. the uniaxial mechanical properties of commercial pure aluminium are considered by assuming isotropic nonlinear work-hardening combined to von mises and drucker isotropic yield criteria to predict the ecae load and the effective plastic strain. from the proposed 25 factorial analysis, the main parameters affecting the ecae pressure may be ranked as: (1) friction factor, (2) die channels intersection angle, (3) outer and (4) inner die corners fillet radii and lastly, (5) plunger velocity. alternatively, the effective plastic strain is mainly controlled by the die channels intersection angle and, in a less extent, by the outer and inner die corners fillet radii.
Critérios editoriais de avalia??o científica: notas para discuss?o
Pessanha, Charles;
Ciência da Informa??o , 1998, DOI: 10.1590/S0100-19651998000200020
Abstract: it describes the evaluation system of scientific literature, known as peer review or referee system, which involves both scientific editor and referees. it also discusses ethics and science and includes types of unethical conduct in scientific publishing, examples of procedures for referees, and the main directives of the ethics code of the american sociological association, referring to the communication of science.
Criterios editoriales para la evaluación científica: notas para la discusión
Charles Pessanha
ACIMED , 2001,
Abstract: Se aborda el sistema de evaluación de la producción científica conocido por peer review, referee system o sistema de arbitraje, que vincula al editor científico con los evaluadores. Se hace referencia a la ética en la ciencia y se incluyen tipos de conducta antiéticas en publicaciones científicas, ejemplos de procedimientos para los evaluadores y las principales directrices permanentes del Código de ética de la Asociación Americana de Sociología, relacionadas con la comunicación en la ciencia.
Criterios editoriales para la evaluación científica: notas para la discusión
Charles Pessanha
ACIMED , 2001,
Abstract: Se aborda el sistema de evaluación de la producción científica conocido por peer review, referee system o sistema de arbitraje, que vincula al editor científico con los evaluadores. Se hace referencia a la ética en la ciencia y se incluyen tipos de conducta antiéticas en publicaciones científicas, ejemplos de procedimientos para los evaluadores y las principales directrices permanentes del Código de ética de la Asociación Americana de Sociología, relacionadas con la comunicación en la ciencia.
Capacidade de oxida??o como índice de estabilidade da matéria organica de sedimentos de acordo com gradiente fluvial-estuarino do rio Paraíba do Sul
Baldotto, Marihus Altoé;Canellas, Luciano Pasqualoto;Rosa, Raul Castro Carriello;Range, Thiago Pessanha;Salom?o, Marcos Sarmet Moreira de Barros;Rezende, Carlos Eduardo;
Química Nova , 2011, DOI: 10.1590/S0100-40422011000600011
Abstract: the hummus composition and it redox properties have been used to evaluate the organic matter quality from natural systems. the objectives of this study were the fractionation of the organic matter and the determination of the oxidation capacity of humic acids to evaluate the organic matter quality of sediments from a gradient fluvial-estuarine in the brazilian southeast. the carbon/nitrogen and humic acid/fulvic acid relationships of the organic matter and of the oxidation capacity of humic acids were positively correlated and followed the order: estuarine bordered mangroves ? fluvial bordered urban center and pasture > estuarine bordered pasture ? marine.
Rela??es entre o conhecimento de agricultores e de pedólogos sobre solos: estudo de caso em Rio Pardo de Minas, MG
Correia, Jo?o Roberto;Anjos, Lúcia Helena Cunha dos;Lima, Antonio Carlos Souza;Neves, Delma Pessanha;Toledo, Luciano de Oliveira;Calderano Filho, Braz;Shinzato, Edgar;
Revista Brasileira de Ciência do Solo , 2007, DOI: 10.1590/S0100-06832007000500021
Abstract: one of the challenges of constructing agricultural systems that aim to be sustainable, is the usage of scientific knowledge adapted to the peculiar social situation. for this purpose it is necessary to consider the knowledge that farmers accumulated over time and space. in the case of the soil resources, a modest amount of the local knowledge is considered in classrooms and in soil research. this is a constraint to the application of technologies based on local scientific knowledge involving traditional farmer groups, mainly because of the lack of adaptation to the needs they are aware of. the objective of this study is to show a new methodology that integrates the pedologists' and local farmers' knowledge. the traditional local hierarchy of environments in the cerrado region was used as a tool to understand how this relationship can be constructed. the study was developed based on environmental and social parameters in the água boa 2 community, in rio pardo de minas, state of minas gerais, brazil. it was possible to analyze the local terminology in a field survey and to describe the environments, to classify the land types, and to establish active dialogues about the cerrado and its soils.
Alcoolismo: acusa??o ou diagnóstico?
Neves, Delma Pessanha;
Cadernos de Saúde Pública , 2004, DOI: 10.1590/S0102-311X2004000100002
Abstract: this article presents reflections on how alcohol consumption is conceived as a sociological object, including proscribed forms linked to the definition of diseases or disregard for moral norms. through considerations on the accumulated investment in a research process currently under way, the author highlights the ethical and epistemological dilemmas faced by anthropologists who focus on this issue.
Pobreza e humanismo salvador: media??es subjacentes
Neves, Delma Pessanha;
Dados , 2007, DOI: 10.1590/S0011-52582007000100005
Abstract: considering the relatively recent political recognition of the extreme rates of socioeconomic inequalities and massive states of absolute and relative hunger in brazilian society, alongside the expanded investments in social assistance programs (both by the state and private philanthropy), this article analyzes the conditions for objectively defining a field of intervention-mediation linked by the belief in a saving humanism. the development of this field values forms of mediation between different cognitive universes, corresponding to the worldviews of benefactors and beneficiaries, expressed by the collective construction of terms of communication that redefine interactive positions between spiritists and the needy. instrumentally, the field thus values the analysis of practical investments in the constitutive versions of the case that deserves being characterized by material and spiritual need.
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