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97 results on '"Simőes, Paulo"'

51. The Impulsive Phase in Solar Flares: Recent Multi-wavelength Results and their Implications for Microwave Modeling and Observations

Author

Fletcher, Lyndsay and Simoes, Paulo J. A.

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

This short paper reviews several recent key observations of the processes occurring in the lower atmosphere (chromosphere and photosphere) during flares. These are: evidence for compact and fragmentary structure in the flare chromosphere, the conditions in optical flare footpoints, step-like variations in the magnetic field during the flare impulsive phase, and hot, dense 'chromospheric' footpoints. The implications of these observations for microwaves are also discussed., Comment: 6 pages, 5 figures, presented at 'Solar Physics with Radio Observations' Symposium, November 2012, Nagoya, Japan

Published
2013

52. Solar Burst Analysis with 3D Loop Models

Author

Costa, Joaquim E. R., Simões, Paulo J. A., Pinto, Tereza S. N., and Melnikov, Victor F.

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

A sample of Nobeyama flares was selected and analyzed using loop model for important flare parameters. The model for the flaring region consists of a three dimensional dipolar magnetic field, and spatial distributions of non-thermal electrons. We constructed a database by calculating the flare microwave emission for a wide range of these parameters. Out of this database with more than 5,000 cases we extracted general flare properties by comparing the observed and calculated microwave spectra. The analysis of NoRP data was mostly based in the center-to-limb variation of the flare properties with looptop and footpoint electron distributions and for NoRH maps on the resultant distribution of emission. One important aspect of this work is the comparison of the analysis of a flare using an inhomogeneous source model and a simplistic homogeneous source model. Our results show clearly that the homogeneous source hypothesis is not appropriate to describe the possible flare geometry and its use can easily produce misleading results in terms of non-thermal electron density and magnetic field strength. A center darkening of flares was also obtained as a geometrical property of the loop-like sources., Comment: 11 pages, 11 figures

Published
2013
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53. Implications for electron acceleration and transport from non-thermal electron rates at looptop and footpoint sources in solar flares

Author

Simões, Paulo J. A. and Kontar, Eduard P.

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

The interrelation of hard X-ray (HXR) emitting sources and the underlying physics of electron acceleration and transport presents one of the major questions in high-energy solar flare physics. Spatially resolved observations of solar flares often demonstrate the presence of well-separated sources of bremsstrahlung emission, so-called coronal and footpoint sources. Using spatially resolved X-ray observations by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) and recently improved imaging techniques, we investigate in detail the spatially resolved electron distributions in a few well-observed solar flares. The selected flares can be interpreted as having a standard geometry with chromospheric HXR footpoint sources related to thick-target X-ray emission and the coronal sources characterised by a combination of thermal and thin-target bremsstrahlung. Using imaging spectroscopy techniques, we deduce the characteristic electron rates and spectral indices required to explain the coronal and footpoint X-ray sources. We found that, during the impulsive phase, the electron rate at the looptop is several times (a factor of 1.7-8) higher than at the footpoints. The results suggest that a sufficient number of electrons accelerated in the looptop explain the precipitation into the footpoints and imply that electrons accumulate in the looptop. We discuss these results in terms of magnetic trapping, pitch-angle scattering, and injection properties. Our conclusion is that the accelerated electrons must be subject to magnetic trapping and/or pitch-angle scattering, keeping a fraction of the population trapped inside the coronal loops. These findings put strong constraints on the particle transport in the coronal source and provide quantitative limits on deka-keV electron trapping/scattering in the coronal source., Comment: 12 pages, 7 figures

Published
2013
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54. Fuzzy System-Based Suspicious Pattern Detection in Mobile Forensic Evidence

Author

Barmpatsalou, Konstantia, Cruz, Tiago, Monteiro, Edmundo, Simoes, Paulo, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Coulson, Geoffrey, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin Sherman, Series editor, Stan, Mircea, Series editor, Xiaohua, Jia, Series editor, Zomaya, Albert Y., Series editor, Matoušek, Petr, editor, and Schmiedecker, Martin, editor

Published
2018
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55. Reliable and Smart Decision Support System for Emergency Management Based on Crowdsourcing Information

Author

Villela, Karina, Nass, Claudia, Novais, Renato, Simões, Paulo, Jr., Traina, Agma, Rodrigues, Jose, Jr., Menendez, Jose Manuel, Kurano, Jorge, Franke, Tobias, Poxrucker, Andreas, Kacprzyk, Janusz, Series editor, Valencia-García, Rafael, editor, Paredes-Valverde, Mario Andrés, editor, Salas-Zárate, María del Pilar, editor, and Alor-Hernández, Giner, editor

Published
2018
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56. Driving Workload Indicators: The Case of Senior Drivers

Author

Costa, Nélson, Simões, Paulo, Costa, Susana, Arezes, Pedro, Kacprzyk, Janusz, Series editor, Pal, Nikhil R., Advisory editor, Bello Perez, Rafael, Advisory editor, Corchado, Emilio S., Advisory editor, Hagras, Hani, Advisory editor, Kóczy, László T., Advisory editor, Kreinovich, Vladik, Advisory editor, Lin, Chin-Teng, Advisory editor, Lu, Jie, Advisory editor, Melin, Patricia, Advisory editor, Nedjah, Nadia, Advisory editor, Nguyen, Ngoc Thanh, Advisory editor, Wang, Jun, Advisory editor, and Arezes, Pedro, editor

Published
2018
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58. Effect of Network Architecture Changes on OCSVM Based Intrusion Detection System

Author

Stewart, Barnaby, Rosa, Luis, Maglaras, Leandros, Cruz, Tiago J., Simões, Paulo, Janicke, Helge, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Coulson, Geoffrey, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin Sherman, Series editor, Stan, Mircea, Series editor, Xiaohua, Jia, Series editor, Zomaya, Albert Y., Series editor, Maglaras, Leandros A., editor, Janicke, Helge, editor, and Jones, Kevin, editor

Published
2017
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59. The influence of cell concentration at cryopreservation on neutrophil engraftment after autologous peripheral blood stem cell transplantation

Author

Félix, Olga Margareth Wanderley de Oliveira, Tunes, Gisela, Ginani, Valéria Cortez, Simões, Paulo César, Barros, Daniele Porto, Delbuono, Elizabete, Alves, Maria Teresa de Seixas, Petrilli, Antonio Sérgio, Lee, Maria Lúcia de Martino, Gouveia, Roseane Vasconcelos, Zecchin, Victor Gottardello, and Seber, Adriana

Published
2018
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66. Towards a High Performance DNSaaS Deployment

Author

Sousa, Bruno, Marques, Claudio, Palma, David, Gonçalves, João, Simões, Paulo, Bohnert, Thomas, Cordeiro, Luis, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Coulson, Geoffrey, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin (Sherman), Series editor, Stan, Mircea, Series editor, Xiaohua, Jia, Series editor, Zomaya, Albert, Series editor, Agüero, Ramón, editor, Zinner, Thomas, editor, Goleva, Rossitza, editor, Timm-Giel, Andreas, editor, and Tran-Gia, Phuoc, editor

Published
2015
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68. Big Data in Cloud: A Data Architecture

Author

Sá, Jorge Oliveira e, Martins, César, Simões, Paulo, Kacprzyk, Janusz, Series editor, Rocha, Alvaro, editor, Correia, Ana Maria, editor, Costanzo, Sandra, editor, and Reis, Luis Paulo, editor

Published
2015
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72. Assurance and Trust Indicators to Evaluate Accuracy of On-line Risk in Critical Infrastructures

Author

Schaberreiter, Thomas, Caldeira, Filipe, Aubert, Jocelyn, Monteiro, Edmundo, Khadraoui, Djamel, Simões, Paulo, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Bologna, Sandro, editor, Hämmerli, Bernhard, editor, Gritzalis, Dimitris, editor, and Wolthusen, Stephen, editor

Published
2013
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74. Peer Selection in P2P Service Overlays Using Geographical Location Criteria

Author

Fiorese, Adriano, Simões, Paulo, Boavida, Fernando, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Murgante, Beniamino, editor, Gervasi, Osvaldo, editor, Misra, Sanjay, editor, Nedjah, Nadia, editor, Rocha, Ana Maria A. C., editor, Taniar, David, editor, and Apduhan, Bernady O., editor

Published
2012
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75. Trust and Reputation for Information Exchange in Critical Infrastructures

Author

Caldeira, Filipe, Monteiro, Edmundo, Simões, Paulo, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Xenakis, Christos, editor, and Wolthusen, Stephen, editor

Published
2011
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76. On the Dimensioning of an Aggregation Service for P2P Service Overlay Networks

Author

Fiorese, Adriano, Simões, Paulo, Boavida, Fernando, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Chrisment, Isabelle, editor, Couch, Alva, editor, Badonnel, Rémi, editor, and Waldburger, Martin, editor

Published
2011
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78. OMAN – A Management Architecture for P2P Service Overlay Networks

Author

Fiorese, Adriano, Simões, Paulo, Boavida, Fernando, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Stiller, Burkhard, editor, and De Turck, Filip, editor

Published
2010
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79. An IPSec Mediation Approach for Safe Establishment of Inter-domain VPNs

Author

Matos, Alexandre, Matos, Fernando, Simões, Paulo, Monteiro, Edmundo, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Nunzi, Giorgio, editor, Scoglio, Caterina, editor, and Li, Xing, editor

Published
2009
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80. A P2P-Based Approach to Cross-Domain Network and Service Management

Author

Fiorese, Adriano, Simões, Paulo, Boavida, Fernando, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Sadre, Ramin, editor, and Pras, Aiko, editor

Published
2009
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92. MICIE: An Alerting Framework for Interdependent Critical Infrastructures

Author

Capodieci, Paolo, Minichino, Michele, Panzieri, Stefano, Castrucci, Marco, Neri, Alessandro, Lev, Leonid, Simões, Paulo, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Di Nitto, Elisabetta, editor, and Yahyapour, Ramin, editor

Published
2010
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94. 3 - Next-Generation Communication Systems for PPDR: the SALUS Perspective

Author

Marques, Hugo, Pereira, Luís, Rodriguez, Jonathan, Mantas, Georgios, Sousa, Bruno, Fonseca, Hugo, Cordeiro, Luís, Palma, David, Barbatsalou, Konstantia, Simões, Paulo, Monteiro, Edmundo, Nyanyo, Andy, Wickson, Peter, Bouwers, Bert, Kolundzija, Branko, Olcan, Dragan, Zerbib, Daniel, Brouet, Jérôme, Lasserre, Philippe, Galiotos, Panagiotis, Chrysikos, Theofilos, Jelenc, David, Kos, Jernej, Trček, Denis, Ladas, Alexandros, Weerasinghe, Nuwan, Adigun, Olayinka, Politis, Christos, and Müller, Wilmuth

Published
2016
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