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.

Revised and extended analysis of the Zn-like Kr ion

Abstract: The spectrum of the six times-ionized krypton (Kr VII) has been observed in the 300–4800 A wavelength range, resulting in 115 new classified lines. We revised the values for the previously known energy levels and extended the analysis to 38 new energy levels belonging to 4s5s, 4s6s, 4p4f, 4s6d and 4p4d, 4s5p, 4s4f, 4p5s, 4s5f, 4s6p, 4s6f even and odd configurations, respectively. For the prediction of the atomic parameters, energy levels and transition, regularities of atomic structure and relativistic Hartree–Fock calculations were used.

Aplicação da análise exploratória de dados na discriminação geográfica do quiabo do Rio Grande do Norte e Pernambuco

Abstract: Samples of okra from Caruaru and Vitoria of Santo Antao, in the State of Pernambuco, and Ceara-Mirim, Macaiba and Extremoz in the State of Rio Grande do Norte have been analysed. Two different methods were applied in the data treatment allowing to geographically discriminate samples from different origins: Principal Component Analysis - PCA and Hierarquical Cluster Analysis - HCA.

Emergência e crescimento inicial de plântulas de Swietenia macrophylla (King) em função da posição da semente e presença do endocarpo

Abstract: Mahogany (Swietenia macrophylla King) is a high economic potential Meliaceae found in an upland forest of the Brazilian Amazon, one of the most exploited species in Brazil and because of that is endangered. The study aimed to evaluate the effect of sowing position and presence of endocarp in the emergence and initial growth of S. macrophylla seedlings. The design was completely randomized with four replications of 25 seeds, arranged in a factorial 3 × 2 (positions and endocarp). The treatments consisted of different positions of the seed on the substrate with reference to the germ pore: 0° – germ pore turned up – PGC; 90° – germ pore turned to the side – PGL; 180° – germ pore turned down – PGB. Were evaluated: the percentage of emergency, emergency mean time, stem diameter, number of leaves, shoot height, root length, dry weight of shoot and root dry mass. The seed positions affect the percentage and the mean time of seedlings emergency of S. macrophylla. The position 0o provides greater emergence rates and lower mean time of emergency. To encourage the emergence and initial growth of S. macrophylla seedlings, sowing should be performed with the seed germination pore turned up without the presence of endocarp.

Mejoramiento de las características agronómicas y rendimiento de fruto de camu-camu con el uso de biofertilizantes en Loreto, Perú

Abstract: Para incrementar la calidad y el rendimiento de las cosechas en las parcelas de los pequenos productores, es necesario buscar alternativas de fertilizacion organica de bajo costo y de facil aplicacion. En ese sentido, el objetivo de este estudio fue determinar el efecto de biofertilizantes en las caracteristicas agronomicas y rendimiento de fruto camu-camu. El experimento fue conducido mediante un diseno de bloques completamente al azar (DBCA) con cinco tratamientos, seis bloques y una planta por unidad experimental. Los biofertilizantes fueron: T1) Testigo sin biofertilizante, T2) Pollinaza, T3) Bovinaza, T4) Guano de Isla, T5) Gallinaza. Despues de 210 dias, fue verificado que las plantas tratadas con el biofertilizante bovinaza presentaron los mejores resultados en longitud, diametro, peso y rendimiento de fruto con 24, 96 mm; 27,28 mmy 11,35 gy 14,15 kg.pl-1, respectivamente. De esta manera, se concluye que los biofertilizantes elaborados a partir de estiercol de ganado bovino y de aves de corral mejoraron significativamente el rendimiento, tamano y peso de fruto en plantas de camu-camu.