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Papers by Paulino Ribeiro Villas Boas

Research paper thumbnail of Applications of Laser-Induced Breakdown Spectroscopy for Soil Characterization, Part II: Review of Elemental Analysis and Soil Classification

European Journal of Soil Science

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Research paper thumbnail of Applications of Laser-Induced Breakdown Spectroscopy for Soil Analysis, Part I: Review of Fundamentals and Chemical and Physical Properties

European Journal of Soil Science

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Research paper thumbnail of One-point calibration of Saha-Boltzmann plot to improve accuracy and precision of quantitative analysis using laser-induced breakdown spectroscopy

Spectrochimica Acta Part B: Atomic Spectroscopy

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Research paper thumbnail of Evaluation of carbon content and humification index of soils under the application of by-products from sugarcane processing

Microchemical Journal

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Research paper thumbnail of Efeito da amostragem nas propriedades topológicas de redes complexas

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Research paper thumbnail of Phosphorous quantification in fertilizers using laser induced breakdown spectroscopy (LIBS): a methodology of analysis to correct physical matrix effects

Anal. Methods, 2015

P analysis in fertilizers using LIBS.

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Research paper thumbnail of Performance Evaluation of a Portable Laser-Induced Fluorescence Spectroscopy System for the Assessment of the Humification Degree of the Soil Organic Matter

Journal of the Brazilian Chemical Society, 2015

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Research paper thumbnail of Desenvolvimento De Novo Método Para Quantificação De Potássio Em Fertilizantes Usando a Técnica Libs

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Research paper thumbnail of Carbon Quantification in Forest Soils Using Low Resolution Laser-Induced Breakdown Spectroscopy

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Research paper thumbnail of Modeling Highway Networks with Path-Geographical Transformations

Studies in Computational Intelligence, 2009

A model of highway networks is proposed which is based on the generalization of the concept of ge... more A model of highway networks is proposed which is based on the generalization of the concept of geographical networks to incorporate several of the intermediate towns found between two main localities. This model is validated with respect to the US highway ...

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Research paper thumbnail of Modeling worldwide highway networks

Physics Letters A, 2009

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Research paper thumbnail of Chain motifs: The tails and handles of complex networks

Physical Review E, 2008

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Research paper thumbnail of Sensitivity of complex networks measurements

Journal of Statistical Mechanics: Theory and Experiment, 2010

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Research paper thumbnail of Border trees of complex networks

Journal of Physics A: Mathematical and Theoretical, 2008

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Research paper thumbnail of Analyzing and modeling real-world phenomena with complex networks: a survey of applications

Advances in Physics, 2011

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Research paper thumbnail of Seeking the best Internet model

Arxiv preprint arXiv:0706.3225, Jun 21, 2007

Abstract: The models of the Internet reported in the literature are mainly aimed at reproducing t... more Abstract: The models of the Internet reported in the literature are mainly aimed at reproducing the scale-free structure, the high clustering coefficient and the small world effects found in the real Internet, while other important properties (eg related to centrality and hierarchical measurements) are not considered. For a better characterization and modeling of such network, a larger number of topological properties must be considered. In this work, we present a sound multivariate statistical approach, including feature spaces and ...

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Research paper thumbnail of Characterization of complex networks: A survey of measurements

Advances in Physics, 2007

Each complex network (or class of networks) presents specific topological features which characte... more Each complex network (or class of networks) presents specific topological features which characterize its connectivity and highly influence the dynamics of processes executed on the network. The analysis, discrimination, and synthesis of complex networks therefore rely on the use of measurements capable of expressing the most relevant topological features. This article presents a survey of such measurements. It includes general considerations about complex network characterization, a brief review of the principal models, and the ...

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Research paper thumbnail of Characterization of complex networks: A survey of measurements

Advances in Physics, 2007

Each complex network (or class of networks) presents specific topological features which characte... more Each complex network (or class of networks) presents specific topological features which characterize its connectivity and highly influence the dynamics of processes executed on the network. The analysis, discrimination, and synthesis of complex networks therefore rely on the use of measurements capable of expressing the most relevant topological features. This article presents a survey of such measurements. It includes general considerations about complex network characterization, a brief review of the principal models, and the ...

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Research paper thumbnail of Identification of citrus varieties using laser-induced fluorescence spectroscopy (LIFS)

Computers and Electronics in Agriculture, 2013

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Research paper thumbnail of Infrared spectroscopy: A potential tool in huanglongbing and citrus variegated chlorosis diagnosis

Talanta, Jan 15, 2012

Huanglongbing (HLB) and citrus variegated chlorosis (CVC) are serious threats to citrus productio... more Huanglongbing (HLB) and citrus variegated chlorosis (CVC) are serious threats to citrus production and have caused considerable economic losses worldwide, especially in Brazil, which is one of the biggest citrus producers in the world. Neither disease has a cure nor an efficient means of control. They are also generally confused with each other in the field since they share similar initial symptoms, e.g., yellowing blotchy leaves. The most efficient tool for detecting these diseases is by polymerase chain reaction (PCR). However, PCR is expensive, is not high throughput, and is subject to cross reaction and contamination. In this report, a diagnostic method is proposed for detecting HLB and CVC diseases in leaves of sweet orange trees using attenuated total reflectance Fourier transform infrared spectroscopy and the induced classifier via partial least-squares regression. Four different leaf types were considered: healthy, CVC-symptomatic, HLB-symptomatic, and HLB-asymptomatic. The ...

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Research paper thumbnail of Applications of Laser-Induced Breakdown Spectroscopy for Soil Characterization, Part II: Review of Elemental Analysis and Soil Classification

European Journal of Soil Science

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Applications of Laser-Induced Breakdown Spectroscopy for Soil Analysis, Part I: Review of Fundamentals and Chemical and Physical Properties

European Journal of Soil Science

Bookmarks Related papers MentionsView impact

Research paper thumbnail of One-point calibration of Saha-Boltzmann plot to improve accuracy and precision of quantitative analysis using laser-induced breakdown spectroscopy

Spectrochimica Acta Part B: Atomic Spectroscopy

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Evaluation of carbon content and humification index of soils under the application of by-products from sugarcane processing

Microchemical Journal

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Research paper thumbnail of Efeito da amostragem nas propriedades topológicas de redes complexas

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Phosphorous quantification in fertilizers using laser induced breakdown spectroscopy (LIBS): a methodology of analysis to correct physical matrix effects

Anal. Methods, 2015

P analysis in fertilizers using LIBS.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Performance Evaluation of a Portable Laser-Induced Fluorescence Spectroscopy System for the Assessment of the Humification Degree of the Soil Organic Matter

Journal of the Brazilian Chemical Society, 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Desenvolvimento De Novo Método Para Quantificação De Potássio Em Fertilizantes Usando a Técnica Libs

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Carbon Quantification in Forest Soils Using Low Resolution Laser-Induced Breakdown Spectroscopy

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Modeling Highway Networks with Path-Geographical Transformations

Studies in Computational Intelligence, 2009

A model of highway networks is proposed which is based on the generalization of the concept of ge... more A model of highway networks is proposed which is based on the generalization of the concept of geographical networks to incorporate several of the intermediate towns found between two main localities. This model is validated with respect to the US highway ...

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Research paper thumbnail of Modeling worldwide highway networks

Physics Letters A, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Chain motifs: The tails and handles of complex networks

Physical Review E, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Sensitivity of complex networks measurements

Journal of Statistical Mechanics: Theory and Experiment, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Border trees of complex networks

Journal of Physics A: Mathematical and Theoretical, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Analyzing and modeling real-world phenomena with complex networks: a survey of applications

Advances in Physics, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Seeking the best Internet model

Arxiv preprint arXiv:0706.3225, Jun 21, 2007

Abstract: The models of the Internet reported in the literature are mainly aimed at reproducing t... more Abstract: The models of the Internet reported in the literature are mainly aimed at reproducing the scale-free structure, the high clustering coefficient and the small world effects found in the real Internet, while other important properties (eg related to centrality and hierarchical measurements) are not considered. For a better characterization and modeling of such network, a larger number of topological properties must be considered. In this work, we present a sound multivariate statistical approach, including feature spaces and ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Characterization of complex networks: A survey of measurements

Advances in Physics, 2007

Each complex network (or class of networks) presents specific topological features which characte... more Each complex network (or class of networks) presents specific topological features which characterize its connectivity and highly influence the dynamics of processes executed on the network. The analysis, discrimination, and synthesis of complex networks therefore rely on the use of measurements capable of expressing the most relevant topological features. This article presents a survey of such measurements. It includes general considerations about complex network characterization, a brief review of the principal models, and the ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Characterization of complex networks: A survey of measurements

Advances in Physics, 2007

Each complex network (or class of networks) presents specific topological features which characte... more Each complex network (or class of networks) presents specific topological features which characterize its connectivity and highly influence the dynamics of processes executed on the network. The analysis, discrimination, and synthesis of complex networks therefore rely on the use of measurements capable of expressing the most relevant topological features. This article presents a survey of such measurements. It includes general considerations about complex network characterization, a brief review of the principal models, and the ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Identification of citrus varieties using laser-induced fluorescence spectroscopy (LIFS)

Computers and Electronics in Agriculture, 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Infrared spectroscopy: A potential tool in huanglongbing and citrus variegated chlorosis diagnosis

Talanta, Jan 15, 2012

Huanglongbing (HLB) and citrus variegated chlorosis (CVC) are serious threats to citrus productio... more Huanglongbing (HLB) and citrus variegated chlorosis (CVC) are serious threats to citrus production and have caused considerable economic losses worldwide, especially in Brazil, which is one of the biggest citrus producers in the world. Neither disease has a cure nor an efficient means of control. They are also generally confused with each other in the field since they share similar initial symptoms, e.g., yellowing blotchy leaves. The most efficient tool for detecting these diseases is by polymerase chain reaction (PCR). However, PCR is expensive, is not high throughput, and is subject to cross reaction and contamination. In this report, a diagnostic method is proposed for detecting HLB and CVC diseases in leaves of sweet orange trees using attenuated total reflectance Fourier transform infrared spectroscopy and the induced classifier via partial least-squares regression. Four different leaf types were considered: healthy, CVC-symptomatic, HLB-symptomatic, and HLB-asymptomatic. The ...

Bookmarks Related papers MentionsView impact