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.

Fisiografia da paisagem e aspectos biogeomorfológicos do lavrado, roraima, brasil

Abstract: Este estudo discute a relevante interacao entre os aspectos morfologicos do relevo (Geomorfologia) correlacionados com os aspectos de distribuicao da biota (Biogeografia). A regiao aqui discutida, esta inserida dentro do dominio morfoclimatico amazonico, no Estado de Roraima. As interpretacoes geomorfologicas dos habitats foram baseadas em tecnicas de sensoriamento remoto, utilizando imagens Landsat 7 (produto Geocover, 2000) para descrever processos agradacionais e o modelo de elevacao da SRTM, para os processos denudacionais, processadas pelo Lab. de Metricas da Paisagem (Geografia/UFRR). O Estado de Roraima, representando ~3% da Amazonia, insere-se como uma regiao que representa as mais variadas tipologias morfologicas do relevo e vegetacao, distribuidos neste dominio morfoclimatico. Abrange desde relevos baixos, arrasados por intemperismo quimico profundo ( etchplanacao ), com planicies fluviais bem desenvolvidas, das quais destacam-se os principais rios com pelo menos 17.500 km² de area umida, o rio Branco sendo o principal com 3.400 km² de planicie fluvial. Ocorrem formacoes de sistemas lacustres fluviais e desconexos destes, formando areas periodicamente alagaveis, no lavrado e campinaranas, por exemplo, no lavrado ocupam cerca de 832,627 km², formando um sistema hidrogeoecologico interconectado por campos e veredas com 11.340 km² de extensao, constituindo morfologias tipicas de sistemas agradacionais (deposicionais). Estas areas umidas em Roraima, levando em consideracao somente rios com planicies fluviais desenvolvidas, campos com sistemas lacustres, e areas de influencia de buritizais, estao em torno de 20.750 km² de extensao. Estes aspectos sao de fundamental importância para se compreender a dinâmica hidrogeomorfologica dos habitats de Roraima, com base em tecnicas das quais e possivel analisar parâmetros geomorfometricos, metodologia empregada para dar mais subsidios na descricao da paisagem.

Multiculturalismo e multiculturalidade: recorrências discursivas na educação musical

Abstract: A discussao feita neste texto traz algumas contribuicoes do campo dos Estudos Culturaiscontemporâneos feitas as questoes sobre cultura e identidade. Sem a pretensao de aprofundaresses complexos conceitos do referido campo, o objetivo e propor uma alternativa as abordagensdo multiculturalismo, que tem desempenhado papel quase que hegemonico como base para osestudos em educacao musical. Primeiramente, apresento a abordagem do multiculturalismo comoforma administracao do convivio entre as comunidades de sociedades multiculturais. Em seguida,apresento os conceitos de cultura e identidades hibridas para, ao final, problematizar as recorrenciasdiscursivas presentes na educacao musical sobre a valorizacao de todas as praticas musicais.

Losses of soil, water, organic carbon and nutrients caused by water erosion in different crops and natural savannah in the northern Amazon

Abstract: Currently in Brazil, the main form of erosion is caused by the impact of raindrops on the soil surface, triggering the process of water erosion and causing serious damage to agricultural areas. This study evaluated losses of soil, water, organic carbon and nutrients in different cultures, bare soil and savanna under natural rain. The experimental design was completely randomized with five treatments (bare soil - BS, cowpea bean - CB, Brachiaria brizantha - BB, corn - CO and natural savanna – SN) with three replications; The treatment of bare soil (BS), followed by the treatment cultivated with cowpea bean (CB) showed higher losses of soil, water, organic carbon and nutrients; The highest losses of soil, water, organic carbon and nutrients in the treatment of bare soil (BS) occurred during the period of greatest erosivity; but for treatments CB, BB and CO, the highest losses occurred during the establishment of the crop, in view of the lower soil cover. Soils cultivated with Brachiaria brizantha - BB, corn - CO and in the Natural Savana - SN area were more efficient in reducing soil and water losses during all months evaluated. Plant cover produced by the (SN) treatment and by the (BB) and (CO) treatments acted to reduce the harmful effects of erosion, minimizing losses of nutrients and organic carbon. The soil should be well protected during periods when rainfall presents the highest values of erosivity index.

Travellers of the Caribbean: Positioning Brasília in Haitian migration routes through Latin America

Abstract: This paper examines how Haitian migration connecting Haiti to Brasilia is enacted through Latin America. The empirical data come from an ethnographic study of Haitians in Brasilia. Semi-structured interviews and focus groups were conducted with 34 migrants to reconstruct their mobilities. We explore how the Haitians’ historical practice of living on the move has enabled them to deal with border controls and develop tactics to circulate through several Latin America countries, including Brazil. We argue that their migration to the Brazilian capital can neither be understood as a linear movement characterized by an established Haiti-Brasilia connection nor defined as movement to a place where these migrants attempt to settle down. Rather, we show that the recent presence of Brasilia in the mobility of these Haitians has to be understood in the context of a vast dynamic meshwork of places, people and information.