Matrix Models
Mostrando 1-12 de 379 artigos, teses e dissertações.
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1. Assessment of Covariance Selection Methods in High-Dimensional Gaussian Graphical Models
ABSTRACT The covariance selection in Gaussian graphical models consists in selecting, based on a sample of a multivariate normal vector, all those pairs of variables that are conditionally dependent given the remaining variables. This problem is equivalent to estimate the graph identifying the nonzero elements on the off-diagonal entries of the precision mat
Trends in Computational and Applied Mathematics. Publicado em: 2022
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2. Challenges of business models for sustainability in startups
Abstract Purpose This study aims to analyze the challenges startups face in implementing business models for sustainability. In particular, the research question of this study is: How do the challenges faced by startups affect business models for sustainability in the context of an emerging country? Design/methodology/approach Startups are increasingly inc
RAUSP Management Journal. Publicado em: 2022
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3. Utilization of the Corncob Agro-Industrial Residue as a Potential Adsorbent in the Biosorption of Bisphenol-A
The presence of plastic waste in water bodies has led to a growing concern due to the impact on human health. Among the most important plastic additive molecules is bisphenol-A (BPA). On the other hand, micro-pollutant removal processes that make use of agro-industrial waste have aroused the interest of researchers. This is because the accumulation of lignoc
J. Braz. Chem. Soc.. Publicado em: 2021-07
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4. Alternative Approaches Applied to Inductively Coupled Plasma Techniques: Multi-Flow and Two-Flow Calibration
Multi-flow calibration (MFC) is based on monitoring the analytical signal from a single calibration standard solution at several different nebulization gas flow rates (Q), which normalizes plasma conditions and minimizes matrix effects. In the present study, MFC was evaluated, for the first time, applied to inductively coupled plasma optical emission spectro
J. Braz. Chem. Soc.. Publicado em: 2021-04
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5. Sobre reformas y políticas sanitarias en la España de los últimos años del franquismo y la transición democrática
An organic-inorganic hybrid material based on a silica matrix and functionalized with imidazole group was successfully synthesized by the sol-gel process. The characterization techniques enabled the confirmation of the proposed structure as well as the effectiveness of the imidazole ring functionality in the structure of the material. It is insoluble in wate
Hist. cienc. saude-Manguinhos. Publicado em: 2020-10
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6. Synthesis and Characterization of Hybrid Polymer Based on Functionalized Silica as Efficient Adsorbent for Heavy Metal Ions from Aqueous Solution
An organic-inorganic hybrid material based on a silica matrix and functionalized with imidazole group was successfully synthesized by the sol-gel process. The characterization techniques enabled the confirmation of the proposed structure as well as the effectiveness of the imidazole ring functionality in the structure of the material. It is insoluble in wate
J. Braz. Chem. Soc.. Publicado em: 2020-10
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7. MULTILEVEL NONLINEAR MIXED-EFFECTS MODEL AND MACHINE LEARNING FOR PREDICTING THE VOLUME OF Eucalyptus SPP. TREES
ABSTRACT Volumetric equations is one of the main tools for quantifying forest stand production, and is the basis for sustainable management of forest plantations. This study aimed to assess the quality of the volumetric estimation of Eucalyptus spp. trees using a mixed-effects model, artificial neural network (ANN) and support-vector machine (SVM). The datab
CERNE. Publicado em: 2020-03
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8. Modelos estatísticos para geração da Planta de Valores Genéricos: uma aplicação em município de pequeno porte
Resumo Importante fonte de arrecadação dos municípios, o IPTU tem como base de cálculo o valor venal do imóvel, estabelecido pela Planta de Valores Genéricos (PVG), a qual está desatualizada na maior parte dos municípios brasileiros. Assim, o objetivo deste trabalho foi utilizar a econometria espacial para gerar um modelo que permita determinar o val
urbe, Rev. Bras. Gest. Urbana. Publicado em: 09/12/2019
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9. Pain catastrophizing: rumination is a discriminating factor among individuals with different pain characteristic
Abstract: The objective of this study was to compare the scores of the Helplessness, Magnification, Rumination, and Catastrophizing factors of the Pain Catastrophizing Scale (PCS) between samples with different pain characteristics. The psychometric properties of the PCS were evaluated in 1,151 Brazilian adults (78.9% female; 38.6 (SD = 10.8) years): 335 had
Braz. oral res.. Publicado em: 02/12/2019
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10. Technical and economic viability of the installation of a hybrid solar-wind generation system in a Brazilian industry
Abstract The demand for electricity is growing worldwide. At the same time, the non-renewable natural resources that account for a large proportion of the global energy matrix are rapidly depleting, which will pose a major challenge in the near future. Therefore, micro-grid models that use renewable energy sources, such as solar and wind, are rapidly develo
Braz. arch. biol. technol.. Publicado em: 25/11/2019
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11. APOIO MATRICIAL COMO ESTRATÉGIA DE ORDENAÇÃO DO CUIDADO EM SAÚDE MENTAL
Resumo O estudo do tipo qualitativo e transversal, com o objetivo de analisar a perspectiva dos profissionais dos centros de atenção psicossocial acerca do apoio matricial como estratégia de cuidado psicossocial em saúde mental. Foram utilizadas dez entrevistas semiestruturadas com profissionais de serviços de saúde mental do município de Imperatriz,
Trab. educ. saúde. Publicado em: 11/11/2019
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12. Influence of Composition on Mechanical Properties of Cassava Starch, Sisal Fiber and Carnauba Wax Biocomposites
Concern for sustainable development has provided significant improvements in the development of biodegradable materials. This work aims to evaluate, through a central composite design (CCD), the mechanical properties of cassava starch-based biocomposites manufactured with different compositions of carnauba wax (CW), sisal fiber (SF) and glycerol (G). The bio
Mat. Res.. Publicado em: 24/10/2019