Výsledky vyhledávání - "G. B. Ventura"

Nonlinear optical conductivity of a two-band crystal I

Autor: J. M. B. Lopes dos Santos, G. B. Ventura, J. M. Viana Parente Lopes, D. J. Passos

The structure of the electronic nonlinear optical conductivity is elucidated in a detailed study of the time-reversal symmetric two-band model. The nonlinear conductivity is decomposed as a sum of contributions related with different regions of the F

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc966fb6c4634d45b47a3c4563f44990
http://arxiv.org/abs/2102.07629

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Theoretical calculations of nonlinear optical calculations of 2D materials

Autor: G. B. Ventura, J. M. Viana Parente Lopes, D. J. Passos, J. M. B. Lopes dos Santos

Publikováno v: EPJ Web of Conferences, Vol 233, p 03001 (2020)

One important feature of two dimensional (2D) materials is that they possess an exceptional nonlinear optical (NLO) response to light, with conduc¬tivities that are several orders of magnitude larger than their 3D counterparts. The theoretical descr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::694afda8e8e1389b9ce78970fa62299d
https://www.epj-conferences.org/articles/epjconf/pdf/2020/09/epjconf_cmpnc2019_03001.pdf

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A study of the nonlinear optical response of the plain graphene and gapped graphene monolayers beyond the Dirac approximation

Autor: G. B. Ventura, J. M. B. Lopes dos Santos, D. J. Passos, J. M. Viana Parente Lopes

In this work, we present numerical results for the second and third order conductivities of the plain graphene and gapped graphene monolayers associated with the second and third harmonic generation, the optical rectification and the optical Kerr eff

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70e1f03993401e5d4dbdbb62b821a07c

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Nonlinear optical responses of crystalline systems: results from a velocity gauge analysis

Autor: J. M. Viana Parente Lopes, Nuno M. R. Peres, D. J. Passos, J. M. B. Lopes dos Santos, G. B. Ventura

Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP

In this work, the difficulties inherent to perturbative calculations in the velocity gauge are addressed. In particular, it is shown how calculations of nonlinear optical responses in the independent particle approximation can be done to any order an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f3db2214d8b80880fc7f42d063f4e15

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COX-2 rs20417 Polymorphism Is Associated with Stroke and White Matter Disease

Autor: Ana C.P. Ornellas, Karen L. Furie, Roque Aras, Jamary Oliveira-Filho, Jonathan Rosand, Valéria M. Borges, Laís M. G. B. Ventura, André Maurício Souza Fernandes, Luciana M.B. Oliveira, Steven M. Greenberg, Théo Araújo-Santos, Francisco José Farias Borges dos Reis, Natalia S. Rost, Cathy R. Zhang

Publikováno v: Journal of Stroke and Cerebrovascular Diseases. 24:1817-1822

Background: To investigate the effect of COX-2 polymorphism and its product, prostaglandin E2 (PGE2), on stroke risk in an endemic area for Chagas disease. In a separate cohort, to investigate the effect of COX-2 polymorphisms on the total burden of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::311acfe1354ccd545ecc09a94e5ede6e
https://doi.org/10.1016/j.jstrokecerebrovasdis.2015.04.018

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Gauge covariances and nonlinear optical responses

Autor: J. M. B. Lopes dos Santos, J. M. Viana Parente Lopes, G. B. Ventura, D. J. Passos, Nuno M. R. Peres

Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP

The formalism of the reduced density matrix is pursued in both length and velocity gauges of the perturbation to the crystal Hamiltonian. The covariant derivative is introduced as a convenient representation of the position operator. This allow us to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b18a54a4e358c5a11c0e14cc08998a7e

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Risk Factors Associated With Falls in Adult Patients After Stroke Living in the Community: Baseline Data From a Stroke Cohort in Brazil

Autor: Iara Maso, Elen Beatriz Pinto, Mayra Castro, Jamary Oliveira-Filho, Ilana Oliveira, Maiana Monteiro, Camila Marinho, Antonio Alberto Lopes, Carla Ferreira Nascimento, Paula Myllane-Fernandes, Laís M. G. B. Ventura

Publikováno v: Topics in Stroke Rehabilitation. 21:220-227

Individuals with stroke have a high risk of falling, and their fall predictors may differ from those of other populations.To estimate fall frequency and identify factors related to fall occurrence in a sample of patients with stroke residing in the c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7b1ba23ab8f46898bb8fafb5b6030496
https://doi.org/10.1310/tsr2103-220

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Low Ankle-Brachial Index is a Simple Physical Exam Sign Predicting Intracranial Atherosclerotic Stenosis in Ischemic Stroke Patients

Autor: Nestor J Barreto-Neto, Jamary Oliveira-Filho, Luana F Fonseca, Mila C. Mueller, Alisson L Andrade, Alexandre D. Barros, Pedro Antônio Pereira de Jesus, Isadora L Ferreira, Carolina C Reis, Morgana L. Jesus, Rodrigo D Fernandes, Adriano A Jesus, Lucas L Resende, Beatriz M Gonçalves, Laís M. G. B. Ventura

Publikováno v: Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association. 25(6)

Background The investigation of ischemic stroke etiology is commonly limited to the heart and extracranial vessels. Nevertheless, the diagnosis of intracranial stenosis may carry important therapeutic implications. The aims of this study were to dete

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::09d381a4442b436ada7dac682d9025b4
https://pubmed.ncbi.nlm.nih.gov/27021041

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Past smoking and current dopamine agonist use show an independent and dose-dependent association with impulse control disorders in Parkinson's disease

Autor: Meirelayne B. Duarte, Philip G. Glass, Jamary Oliveira-Filho, Nádja N. Negreiros, Guilherme T. Valenca, Laís M. G. B. Ventura, Mila C. Mueller

Publikováno v: Parkinsonism & Related Disorders. 19:698-700

Background: Previous studies have described the association between dopamine replacement therapy in Parkinson’s disease and impulse control disorders. Methods: A caseecontrol study was performed to establish the prevalence of four of these behavior

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6097bc25003a7fbea96460d914b6d82d
https://doi.org/10.1016/j.parkreldis.2013.03.004

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