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597 results on '"Machado, Luís"'

1. Free-falling motion of an elastic rigid rod towards a Schwarzschild black hole

Author

Machado, Luís, Natário, José, and Silva, Jorge Drumond

Subjects
General Relativity and Quantum Cosmology, 74K10, 83C55, 83C57
Abstract

We study the motion of an elastic rigid rod which is radially free-falling towards a Schwarzschild black hole. This is accomplished by reducing the corresponding free-boundary PDE problem to a sequence of ODEs, which we integrate numerically. Starting with a rod at rest, we show that it is possible to choose its initial compression profile so that its midpoint falls substantially faster, or slower, than a free-falling particle with the same initial conditions. This seems to be a purely kinematic effect, since on average there is no net transfer of elastic to mechanical energy., Comment: 10 pages, 5 figures; v2: more details added, now 12 pages and 7 figures, matches final published version

Published
2024
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6. Analysis of Complex Survival Data: a tutorial using the Shiny MSM.app application

Author

Soutinho, Gustavo and Meira-Machado, Luís

Subjects
Statistics - Computation, 62N02, 62N03, 62M02, 62M07, 62P10, G.3.14, G.3.15, G.3.17
Abstract

The development of applications for obtaining interpretable results in a simple and summarized manner in multi-state models is a research field with great potential, namely in terms of using open source tools that can be easily implemented in biomedical applications. In this tutorial, we introduce MSM.app, an interactive web application using the Shiny package for the R language. In the following sections, we present the main functionalities of the MSM.app and an explanation of the outputs obtained for better understanding, independent of the statistical knowledge of users., Comment: 26 pages, 30 figures

Published
2022

7. K-Splines on SPD Manifolds

Author

Camarinha, Margarida, Machado, Luís, Silva Leite, Fátima, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Nielsen, Frank, editor, and Barbaresco, Frédéric, editor

Published
2023
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8. Survival Analysis of Organizational Network – An Exploratory Study

Author

Lopes, Paula, Campos, Pedro, Meira-Machado, Luís, Soutinho, Gustavo, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Gervasi, Osvaldo, editor, Murgante, Beniamino, editor, Rocha, Ana Maria A. C., editor, Garau, Chiara, editor, Scorza, Francesco, editor, Karaca, Yeliz, editor, and Torre, Carmelo M., editor

Published
2023
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9. The Kaplan-Meier Estimator: New Insights and Applications in Multi-state Survival Analysis

Author

Meira-Machado, Luís, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Gervasi, Osvaldo, editor, Murgante, Beniamino, editor, Rocha, Ana Maria A. C., editor, Garau, Chiara, editor, Scorza, Francesco, editor, Karaca, Yeliz, editor, and Torre, Carmelo M., editor

Published
2023
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11. The Possibilities of Ocean Innovation Diplomacy to Promote Transnational Innovation Ecosystems for the Maritime Sector

Author

Polejack, Andrei, Machado, Luis Fernando Corrêa da Silva, Abbott-Halpin, Edward, Series Editor, Aguerre, Carolina, Series Editor, Asquer, Alberto, Series Editor, Campbell-Verduyn, Malcolm, Series Editor, Maia, Maria João, Series Editor, Johansson, Tafsir Matin, editor, Dalaklis, Dimitrios, editor, Fernández, Jonatan Echebarria, editor, Pastra, Aspasia, editor, and Lennan, Mitchell, editor

Published
2023
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13. Survival Analysis of Organizational Networks -- An Exploratory Study

Author

Lopes, Paula, Campos, Pedro, and Meira-Machado, Luis

Subjects
Statistics - Applications, 62N02
Abstract

Organizations interact with the environment and with other organizations, and these interactions constitute an important way of learning and evolution. To overcome the problems that they face during their existence, organizations must certainly adopt survival strategies, both individually and in group. The aim of this study is to evaluate the effect of a set of prognostic factors (organizational, size, collaborate strategies, etc.) in the survival of organizational networks. Statistical methods for time to event data were used to analyze the data. We have used the Kaplan-Meier product-limit method to compute and plot estimates of survival, while hypothesis tests were used to compare survival times across several groups. Regression models were used to study the effect of continuous predictors as well as to test multiple predictors at once. Since violations of the proportional hazards were found for several predictors, accelerated failure time models were used to study the effect of explanatory variables on network survival., Comment: 13 pages, 5 figures, 7 tables

Published
2020

18. Algal Proteins

Author

Moreira, Catarina, primary, Machado, Luís, additional, Silva, Maria, additional, Nunes, Rafaela, additional, Pereira, Ricardo N., additional, Rocha, Cristina M.R., additional, Geada, Pedro, additional, and Teixeira, José A., additional

Published
2023
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20. Best Fitting Geodesic Going Through the Riemannian Mean

Author

Machado, Luís, Silva Leite, Fátima, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Brito Palma, Luís, editor, Neves-Silva, Rui, editor, and Gomes, Luís, editor

Published
2022
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21. DEM Simulation: From Granular Crystal Modeling to Large Industrial

Author

Mesquita, André L. A., Machado, Luís Paulo S., Mesquita, Alexandre L. A., Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, di Mare, Francesca, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Ferreira Martins, Marcio, editor, Ramos, Rogério, editor, and Belich, Humberto, editor

Published
2022
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23. Ciência da Informação e Web Semântica: Uma relação efetiva ou apócrifa?

Author

Machado, Luís Miguel, Simões, Maria da Graça, Souza, Renato Rocha, Almeida, Maurício Bacellos, Simões, Maria da Graça, and Borges, Maria Manuel

Subjects
AC. Relationship of LIS with other fields., IL. Semantic web, LC. Internet, including WWW.
Abstract

The Web is the privileged place for seeking information. The potential of the so-called semantic web to enhance retrieval of relevant information seems essential. In Information Science (IS), this idea was developed from the Otlet’s “analogic semantic web”, justifying the connection between the Semantic Web (SW) and the field of IS. We aimed to exam and analyze the presence of subjects related to SW in the output of IS master and PhD courses in Portugal and Brazil (2005-2015). Specifically, we aimed to: identify IS courses, master's dissertations (MD) and PhD thesis (PD) associated to SW; identify the points of confluence between the IS and the SW in these works; characterize the academic profile of these works’ authors and advisors. Based on a qualitative approach, we performed a literature review and an empirical study focused on content analysis of the retrieved works (RCAAP and OASISbr). As results, we have: verified 4 unique records in RCAAP and 40 in OASISbr; identified 4 Master’s and 3 PhD courses (Portugal) and 16 masters and 9 PhD courses (Brazil); retrieved no MD/PD in Portugal, 16 MD and 5 PD in Brazil; identified 3 confluence points: a) mutual contribution (62%), b) WS as an interdisciplinary theme (29%) and c) complementary knowledge (9%); identified 11 works (52%) were the respective researchers have training in IS and Computer Science (CS). The study points to the WS as a field of investigation in IS, although essentially theoretical, insofar as practical interdisciplinary works in CI/CS are incipient and not representative.

Published
2017

24. Environmental Sustainability Assessment of Tissue Paper Production.

Author

Dias, Ana C., Carvalho, Ricardo, Marques, Cristina, Bértolo, Raquel, Carta, Ana, and Machado, Luís

Abstract

The environmental performance of tissue paper varies greatly based on factors such as the type of fibre used as the raw material, the production process and the fuels used to meet the energy requirements. One possible strategy to decrease greenhouse gas emissions in tissue production is the integration of pulp and paper mills and their energy systems at the same site. However, the environmental trade-offs associated with this strategy are still unclear. Therefore, this study aimed (i) to assess for the first time the environmental impacts of tissue paper produced at a typical industrial site in Portugal using slush and market pulp as the main raw material, and (ii) to assess the environmental effects of the integration of bioenergy produced in the pulp mill in tissue production. A life cycle assessment was conducted from cradle to gate using real data from the production of eucalyptus wood, eucalyptus pulp and tissue paper. The results showed that energy consumption in tissue paper production is the main hotspot for most impact categories. When bioenergy is used in tissue production, the environmental impacts decrease by up to 20% for categories other than marine eutrophication and mineral resource scarcity. These results are relevant to support decision making concerning sustainable practices not only for the pulp and paper industry but also for the authorities in charge of defining environmental policies, incentives and tax regulations. [ABSTRACT FROM AUTHOR]

Published
2024
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25. Comparative Analysis and Validation of Different Modulation Strategies for an Isolated DC-DC Dual Active Bridge Converter

Author

Coelho, Sergio, Sousa, Tiago J. C., Monteiro, Vitor, Machado, Luis, Afonso, Joao L., Couto, Carlos, Akan, Ozgur, Editorial Board Member, Bellavista, Paolo, Editorial Board Member, Cao, Jiannong, Editorial Board Member, Coulson, Geoffrey, Editorial Board Member, Dressler, Falko, Editorial Board Member, Ferrari, Domenico, Editorial Board Member, Gerla, Mario, Editorial Board Member, Kobayashi, Hisashi, Editorial Board Member, Palazzo, Sergio, Editorial Board Member, Sahni, Sartaj, Editorial Board Member, Shen, Xuemin (Sherman), Editorial Board Member, Stan, Mircea, Editorial Board Member, Jia, Xiaohua, Editorial Board Member, Zomaya, Albert Y., Editorial Board Member, Afonso, João L., editor, Monteiro, Vitor, editor, and Pinto, José Gabriel, editor

Published
2021
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26. Battery Charging Station for Electric Vehicles Based on Bipolar DC Power Grid with Grid-to-Vehicle, Vehicle-to-Grid and Vehicle-to-Vehicle Operation Modes

Author

Sousa, Tiago J. C., Monteiro, Vítor, Coelho, Sérgio, Machado, Luís, Pedrosa, Delfim, Afonso, João L., Akan, Ozgur, Editorial Board Member, Bellavista, Paolo, Editorial Board Member, Cao, Jiannong, Editorial Board Member, Coulson, Geoffrey, Editorial Board Member, Dressler, Falko, Editorial Board Member, Ferrari, Domenico, Editorial Board Member, Gerla, Mario, Editorial Board Member, Kobayashi, Hisashi, Editorial Board Member, Palazzo, Sergio, Editorial Board Member, Sahni, Sartaj, Editorial Board Member, Shen, Xuemin (Sherman), Editorial Board Member, Stan, Mircea, Editorial Board Member, Jia, Xiaohua, Editorial Board Member, Zomaya, Albert Y., Editorial Board Member, Afonso, João L., editor, Monteiro, Vitor, editor, and Pinto, José Gabriel, editor

Published
2021
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27. Geometric Algorithm to Generate Interpolating Splines on Grassmann and Stiefel Manifolds

Author

Machado, Luís, Leite, Fátima Silva, Batzies, Ekkehard, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Gonçalves, José Alexandre, editor, Braz-César, Manuel, editor, and Coelho, João Paulo, editor

Published
2021
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30. A Three-Phase Bidirectional Variable Speed Drive: An Experimental Validation for a Three-Phase Induction Motor

Author

Machado, Luis, Sousa, Tiago J. C., Pedrosa, Delfim, Monteiro, Vitor, Pinto, J. G., Afonso, Joao L., Akan, Ozgur, Editorial Board Member, Bellavista, Paolo, Editorial Board Member, Cao, Jiannong, Editorial Board Member, Coulson, Geoffrey, Editorial Board Member, Dressler, Falko, Editorial Board Member, Ferrari, Domenico, Editorial Board Member, Gerla, Mario, Editorial Board Member, Kobayashi, Hisashi, Editorial Board Member, Palazzo, Sergio, Editorial Board Member, Sahni, Sartaj, Editorial Board Member, Shen, Xuemin (Sherman), Editorial Board Member, Stan, Mircea, Editorial Board Member, Jia, Xiaohua, Editorial Board Member, Zomaya, Albert Y., Editorial Board Member, Afonso, João L., editor, Monteiro, Vítor, editor, and Pinto, José Gabriel, editor

Published
2020
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31. Unified Traction and Battery Charging Systems for Electric Vehicles: A Sustainability Perspective

Author

Sousa, Tiago J. C., Machado, Luís, Pedrosa, Delfim, Monteiro, Vítor, Afonso, João L., Akan, Ozgur, Editorial Board Member, Bellavista, Paolo, Editorial Board Member, Cao, Jiannong, Editorial Board Member, Coulson, Geoffrey, Editorial Board Member, Dressler, Falko, Editorial Board Member, Ferrari, Domenico, Editorial Board Member, Gerla, Mario, Editorial Board Member, Kobayashi, Hisashi, Editorial Board Member, Palazzo, Sergio, Editorial Board Member, Sahni, Sartaj, Editorial Board Member, Shen, Xuemin (Sherman), Editorial Board Member, Stan, Mircea, Editorial Board Member, Jia, Xiaohua, Editorial Board Member, Zomaya, Albert Y., Editorial Board Member, Afonso, João L., editor, Monteiro, Vítor, editor, and Pinto, José Gabriel, editor

Published
2020
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32. Manual de direito na era digital - Constitucional e ambiental

Author

Flavia Mansur Murad Schaal, Guilherme de Siqueira Castro, Isabella Franco Guerra, João Theotonio Mendes de Almeida Jr., Luis Felipe Rivitti de Paula Machado, Luís Rodolfo Cruz Creuz, Naiara Aparecida Lima Vilela, Paola Cantarini, Patrizia Mastrodonato, Pedro Vilhena, Pietra Quinelato, Rodrigo Gugliara da Silva

Published
2022

37. MANEJO TERAPÊUTICO DA HIPERPLASIA PROSTÁTICA BENIGNA: UMA REVISÃO DE LITERATURA

Author

MELO NETO, FERNANDO DE PAIVA, primary, SOUSA, BARBARA MARIA QUEIROGA ABRANTES FALCÃO DE, additional, RODRIGUES, ISRAEL DE LIMA, additional, PEREZ, JAIRO ARAGÃO, additional, ARAÚJO, LARA BEATRIZ FELIPE RIBEIRO COUTINHO DE, additional, MACHADO, LUÍS FELIPE DANTAS DA NÓBREGA, additional, BELARMINO, MARIA EDUARDA DE ALUSTAU, additional, MARQUES, MARIA HELOÍSA SOARES, additional, PINTO, MILTON PAULO CABRAL DE MELO, additional, CARVALHO, FELIPE GOMES DE OLIVEIRA, additional, and VIANA, MARINNA KARLA DA CUNHA LIMA, additional

Published
2022
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40. MANEJO DIAGNÓSTICO E TERAPÊUTICO DA OBSTRUÇÃO DO DUCTO EJACULATÓRIO: UMA REVISÃO DE LITERATURA

Author

MELO NETO, FERNANDO DE PAIVA, primary, GARCIA, ARIANA LACERDA, additional, BRAGA, EDUARDO PIMENTEL CARNEIRO, additional, PEREZ, JAIRO ARAGÃO, additional, DINIZ, LAÍS NÓBREGA, additional, MACHADO, LUÍS FELIPE DANTAS DA NÓBREGA, additional, MARQUES, MARIA HELOÍSA SOARES, additional, PINTO, MILTON PAULO CABRAL DE MELO, additional, CARVALHO, FELIPE GOMES DE OLIVEIRA, additional, and VIANA, MARINNA KARLA DA CUNHA LIMA, additional

Published
2022
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49. Comparison of Different Pretreatment Processes Envisaging the Potential Use of Food Waste as Microalgae Substrate

Author

Marques, Fabiana, primary, Pereira, Francisco, additional, Machado, Luís, additional, Martins, Joana T., additional, Pereira, Ricardo N., additional, Costa, Monya M., additional, Genisheva, Zlatina, additional, Pereira, Hugo, additional, Vicente, António A., additional, Teixeira, José A., additional, and Geada, Pedro, additional

Published
2024
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