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553 results on '"Oliveira, C. R."'

1. On spectral measures and convergence rates in von Neumann's Ergodic Theorem

Author

Aloisio, M., Carvalho, S. L., de Oliveira, C. R., and Souza, E.

Subjects
Mathematics - Spectral Theory, Mathematics - Dynamical Systems
Abstract

We show that the power-law decay exponents in von Neumann's Ergodic Theorem (for discrete systems) are the pointwise scaling exponents of a spectral measure at the spectral value~$1$. In this work we also prove that, under an assumption of weak convergence, in the absence of a spectral gap, the convergence rates of the time-average in von Neumann's Ergodic Theorem depend on sequences of time going to infinity., Comment: Major changes following suggestions of the referee

Published
2022

3. On the Fourier asymptotics of absolutely continuous measures with power-law singularities

Author

Aloisio, M., de Carvalho, S. L., de Oliveira, C. R., and Souza, E.

Subjects
Mathematics - Spectral Theory
Abstract

We prove sharp estimates on the time-average behavior of the squared absolute value of the Fourier transform of some absolutely continuous measures that may have power-law singularities, in the sense that their Radon-Nikodym derivatives diverge with a power-law order. We also discuss an application to spectral measures of finite-rank perturbations of the discrete Laplacian.

Published
2022

16. Complex $\Gamma$-convergence and magnetic Dirichlet Laplacian in bounded thin tubes

Author

Bedoya, R., de Oliveira, C. R., and Verri, A. A.

Subjects
Mathematical Physics, 81Q15, 49R50, 35P20, 47B99
Abstract

The resolvent convergence of self-adjoint operators via the technique of $\Gamma$-convergence of quadratic forms is adapted to incorporate complex Hilbert spaces. As an application, we find effective operators to the Dirichlet Laplacian with magnetic potentials in very thin bounded tubular regions in space built along smooth closed curves; relatively weak regularity is asked for the potentials, and the convergence is in the norm resolvent sense as the cross sections of the tubes go uniformly to zero., Comment: 22 pages; to appear in Journal of Spectral Theory

Published
2013

18. Helminths infecting the cat-eyed snake Leptodeira annulata Linnaeus 1758 (Squamata: Dipsadidae) in a semiarid region of Brazil

Author

Fernandes De Carvalho E. F., Ferreira Da Silva-Neta A., De Sousa Silva C., De Oliveira C. R., Da Cunha Xavier Nunes J., Gonçalves De Souza T., and Ávila R. W.

Subjects
parasites, nematoda, neotropical, pentastomida, snakes, reptiles, Microbiology, QR1-502
Abstract

Snakes have diverse feeding and living habits, being exposed to a variety of endoparasite communities. However, more studies are still necessary to document these relationships. We examined 18 specimens of the cat-eyed snake Leptodeira annulata from a semi-arid region in Northeast Brazil. Eight taxa of parasites were found, with higher prevalence of cystacanths (Acanthocephala). Five nematode species (Hexametra boddaertii, Oswaldocruzia sp., Oxyascaris sp., Physaloptera sp. and Raillietnema spectans) and the pentastome Raillietiella furcocerca represent a new parasitism record for the host studied. Our results also showed that L. annulata could act as paratenic host for acanthocephalans. These results contribute to the knowledge of the helminth fauna of L. annulata.

Published
2018
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19. Cantor Singular Continuous Spectrum for Operators Along Interval Exchange Transformations

Author

Cobo, M., Gutierrez, C., and de Oliveira, C. R.

Subjects
Mathematical Physics, 47B36, 47B37, 37B05, 37B10
Abstract

It is shown that Schroedinger operators, with potentials along the shift embedding of Lebesgue almost every interval exchange transformations, have Cantor spectrum of measure zero and pure singular continuous for Lebesgue almost all points of the interval.

Published
2007

28. Rainfall variability affects the chemical composition, gas production and degradability of cacti

Author

MENEZES, D. R., SANTOS, J. M. dos, OLIVEIRA, C. R. N. de, MARCELINO, P. D. R., PINHEIRO, A. P. da M., CARVALHO, D. T. Q. de, NASCIMENTO, J. C. S., GOIS, G. C., VOLTOLINI, T. V., QUEIROZ, M. A. A., DANIEL RIBEIRO MENEZES, UNIVASF, JULIANA MUNIZ DOS SANTOS, UNIVASF, CINTIA RAQUEL NUNES DE OLIVEIRA, Universidade Federal da Bahia, POLYANA DEYSE RODRIGUES MARCELINO, Universidade Federal da Bahia, ANNA PAULA DA MATA ARAÚJO PINHEIRO, UNIVASF, DALINNE TAMARA QUEIROZ DE CARVALHO, Universidade Federal da Bahia, JÚLIO CESAR SILVA NASCIMENTO, UNIVASF, GLAYCIANE COSTA GOIS, UNIVASF, TADEU VINHAS VOLTOLINI, CPATSA, and MARIO ADRIANO ÁVILA QUEIROZ, UNIVASF.

Subjects
Pastagem, Schlumbergera (Cactaceae), Matéria Seca, Nopalea Cochenillifera, Terra seca, Degradabilidade dos cactos, Opuntia, Escasez de alimentos, Metabolismo del ácido crasuláceo, Cacto, Fibra detergente neutra, Degradabilidade in vitro
Abstract

The objective was to evaluate the effect of rainfall variability on the chemical composition, in vitro degradability and gas production of cacti in Semiarid region. Made available in DSpace on 2022-09-27T13:06:45Z (GMT). No. of bitstreams: 1 Rainfall-variability-affects-the-chemical-composition-2022.pdf: 458833 bytes, checksum: 36dac7c7dbc666aaefda5c78cc7db948 (MD5) Previous issue date: 2022

Published
2022

29. Arranjo populacional do sorgo forrageiro irrigado para um cultivo eficiente no Semiárido brasileiro

Author

SIMOES, W. L., OLIVEIRA, A. R. de, GUIMARÃES, M. J. M., SILVA, J. S. da, SILVA, W. O. da, OLIVEIRA, C. R. S. de, VOLTOLINI, T. V., BARBOSA, K. V. F., WELSON LIMA SIMOES, CPATSA, ANDERSON RAMOS DE OLIVEIRA, CPATSA, MIGUEL JÚLIO MACHADO GUIMARÃES, Instituto Federal de Educação, Ciência e Tecnologia do Maranhão, JUCICLÉIA SOARES DA SILVA, CNPq/FACEPE, WESLEY OLIVEIRA DA SILVA, Universidade de Pernambuco, Campus de Petrolina, CARLOS ROBERTO SILVA DE OLIVEIRA, UFRPE, TADEU VINHAS VOLTOLINI, CPATSA, and KAIO VINÍCIUS FERNANDES BARBOSA, UPE, Campus de Petrolina.

Subjects
Sorgo Forrageiro, Sorghum Bicolor, Planta Forrageira, Arranjo de plantas, Sorghum sudanense, Sorghum silage, Semiárido, Irrigação
Abstract

O espaçamento de plantio tem influenciado no crescimento e na produtividade da cultura, podendo variar em função das variedades e do manejo adotado. O objetivo do trabalho foi identificar os espaçamentos mais eficientes para o cultivo irrigado de duas variedades de sorgo forrageiro no Semiárido brasileiro. O delineamento experimental foi em blocos ao acaso, em parcelas subsubdivididas, com três repetições. As parcelas foram constituídas por duas variedades de sorgo forrageiro: Sudão e Volumax; as subparcelas por oito espaçamentos, sendo três espaçamentos com fileira simples: 40x40, 50x50, 60x60 cm e cinco com fileiras duplas: 30x40, 30x50, 30x60, 40x50 e 40x60 cm e as subsubparcelas constituídas por dois ciclos de cultivo. Foram avaliadas: altura de planta, diâmetro de colmo, área foliar e produtividade de biomassa fresca (PMF) e seca (PMS). A variedade Sudão apresentou maior altura de plantas, diâmetro de colmo, área foliar e PMS. Os arranjos de plantio nos espaçamentos de 30x40, 30x60 e 40x50 cm são mais eficientes para a variedade Sudão. Para a variedade Volumax, os arranjos de plantio do tipo fileiras simples com espaçamento de 40 cm entre fileiras e em sistema do tipo fileiras duplas nos espaçamentos de 30x60, 40x50 e 40x60 cm são os mais recomendados. Made available in DSpace on 2022-05-05T19:18:10Z (GMT). No. of bitstreams: 1 Sorgo-forrageiro-2022.pdf: 758484 bytes, checksum: ea1f986480d4ad2a7be57ad9e5eb9673 (MD5) Previous issue date: 2022

Published
2022

34. Genetic parameters and path analysis for root yield of cassava under drought and early harvest

Author

OLIVEIRA, C. R. S. de, BOREL, J. C., PEREIRA, D. A., CARVALHO, B. P. de, MEDRADO, E. da S., ISHIKAWA, F. H., OLIVEIRA, E. J. de, CARLOS ROBERTO SILVA DE OLIVEIRA, UNIVASF, JERÔNIMO CONSTANTINO BOREL, UNIVASF, DANILO ALVES PEREIRA, UNIVASF, BRUNA PARENTE DE CARVALHO, UNIVASF, ERICLES DA SILVA MEDRADO, UNIVASF, FRANCINE HIROMI ISHIKAWA, UNIVASF, and EDER JORGE DE OLIVEIRA, CNPMF.

Subjects
Mandioca
Abstract

The objectives of this study were to estimate genetic parameters and identify traits that contribute to early yield in Manihot esculenta Crantz. Ten traits were evaluated in two experiments, one with 138 genotypes and the other with 133, using a completely randomized block design with four replications. All genotype effects were significant. The accuracy was high for the traits, except leaf retention (0.57), and reliability ranged from 0.33 to 0.75. Root weight (RW) and number of roots (NR) showed the highest selection effectiveness (CV r ), although the estimate was less than 1. Moreover, RW and NR obtained high genetic correlation (0.70). Path analysis showed that only number of roots had a significant direct effect on root weight (0.49), and no indirect effect was found. Therefore, accessions exhibited sufficient genetic variability, and indirect selection based on early evaluation of number of roots can be applied in cassava breeding for fresh root yield, increasing gain over time. Made available in DSpace on 2021-12-03T13:00:33Z (GMT). No. of bitstreams: 1 Oliveira-et-al-CBAB-2021-1.pdf: 356341 bytes, checksum: 0778cfcd3526e026b6613f422eceef84 (MD5) Previous issue date: 2021

Published
2021

35. Effects of depot growth hormone replacement on thyroid function and volume in adults with congenital isolated growth hormone deficiency

Author

Leite, N. T. F., Salvatori, R., Alcântara, M. R. S., Alcântara, P. R. S., Oliveira, C. R. P., Oliveira, J. L. M., Anjos-Andrade, F. D., Farias, M. I. T., Britto, C. T. F., Nóbrega, L. M. A., Nascimento-Junior, A. C., Alves, É. O., Pereira, R. M. C., Campos, V. C., Menezes, M., Martinelli-Júnior, C. E., and Aguiar-Oliveira, M. H.

Published
2012
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