Federal University of Roraima

About: Federal University of Roraima is a based out in . It is known for research contribution in the topics: Population & Thermogravimetry. The organization has 981 authors who have published 1218 publications receiving 7849 citations. The organization is also known as: Federal University of Roraima.

Sobre a contração de Lorentz-Fitzgerald

Abstract: Discutimos a contracao do comprimento de Lorentz-Fitzgerald nos contextos do eter de Fresnel e da relatividade especial. Pretendemos esclarecer alguns equivocos que podem ocorrer no entendimento da relacao entre contracao do comprimento, eter e relatividade especial.

“o sol da liberdade pura aqui reluz contínuo”: a construção da imprensa lusófona na inglaterra (1808-1822)1

Abstract: O estudo da imprensa periodica luso-brasileira na cidade de Londres entre 1808 e 1822 revela a necessidade sentida pelos elementos luso-brasileiros de instaurarem um dizer-suporte para significar o Reino Portugues diante do publico ingles. O confronto com os jornais ingleses permitiu a solidificacao e mesmo a definicao de linhas profissionais para o funcionamento da imprensa em Portugal e Brasil. Alem disso, forneceu dados importantes para pensar o papel dos intelectuais exilados para o fomento de uma esfera publica literaria em lingua portuguesa cujas bases de sustentacao estavam protegidas pela constitucionalidade britânica.

Individual selection in a genetic test with 43 advanced progenies of camu-camu Myrciaria dubia Kunth (McVaugh) in floodable plot near Iquitos, Peruvian Amazon

Abstract: The research summarized and validated the individual selection of camu-camu (Myrciaria dubia (Kunth) McVaugh) plants. 43 progenies, previously selected in genetic tests and fields of producers of flood areas, were evaluated. Each progeny was installed in a row of 10 half-sister plants, with a space of 3x2 m. Using the SELEGEN (Reml / Blup) Model 63 program, four crops were analyzed, and individuals were selected for each of the 16 descriptors evaluated. For fruit yield, the Tipishca-Rio Tigre population stood out, occupying 5 of the first 10 places. The individuals TT0725-4 (Tigre-Tipishca) turned out to be a natural recombinant for fruit yield / weight. And individual 64-8 turned out to be triple recombinant (yield / fruit weight / ascorbic acid). The descriptors with the highest genetic control with r ≥ 0.30 were: average fruit weight, brix degrees, plant height, number of basal branches and petiole length. The criteria of similarity of the morphological markers with the fruit yield are proposed as predictive indexes of productivity. The plant height at two years of age was the most important.

Descentralização da vida literária, construção de autoria teórico-crítica na periferia do sistema cultural e de circulação literária

Abstract: Based on an approach that oscillates between testimony and subjectivity, on the one hand, and critical and objective analysis, on the other, this essay discusses the issue of decentralization of Brazilian literary life and relates this relevant issue in the field of literary studies nowadays with the theoretical-critical know-how carried out on the periphery of the national and world cultural systems and also with the issue of literary circulation. The ultimate goal of this article is to propose some basis of action for the reflection on theoretical and critical questions in the field of literary studies produced on the periphery of the mainstream literary and cultural system.

Graphene to Fluorographene: A Reactive Molecular Dynamics Study

Abstract: We have investigated, using fully reactive molecular dynamics methodology, the structural and dynamical aspects of the fluorination of graphene membranes leading to fluographene formation. The strong and fast chemical reactivity processes involving fluorine produce distinct aspects of the observed in the case of the hydrogenation of graphene (the so called graphane formation). Fluorination tends to produce significant defective areas on the graphene membrane with alteration on the typical carbon-carbon distances, sometimes with the presence of large holes due to carbon losses. This may explain the broad distribution of values of lattice parameter experimentally observed.