Guaranazeiro.

bitstream/item/61709/1/Belem-RecBas5.pd

The influence of statistical properties of Fourier coefficients on random surfaces

Many examples of natural systems can be described by random Gaussian surfaces. Much can be learned by analyzing the Fourier expansion of the surfaces, from which it is possible to determine the corresponding Hurst exponent and consequently establish the presence of scale invariance. We show that this symmetry is not affected by the distribution of the modulus of the Fourier coefficients. Furthermore, we investigate the role of the Fourier phases of random surfaces. In particular, we show how the surface is affected by a non-uniform distribution of phases

Agricultural settlement and soil quality in the Brazilian Amazon

This paper discusses the implications of poor or non-existent information on soil quality, at the proper scale, during the planning and implementation of settlement projects in the Brazilian Amazon. Based on data from the Machadinho settlement project, Rondônia, we show that most settlers had no knowledge about the agricultural capability of the area, did not receive technical information, could not afford agricultural inputs, planted inadequate crops in the early years of occupation, and did not manage to stay in their plot for a long period of time. Satellite images indicated that patches of land with good soil quality were not necessarily the first to be utilized. Inadequately planned settlements face many challenges (poor soil being one of them) and are likely to result in land turnover, conversion of land into pasture, land concentration among wealthier persons, invasion of areas by poorer people, and deforestation, defying the main purpose of agrarian reform

Fontes e doses de boro em porta-enxertos de seringueira.

Este trabalho teve por objetivo avaliar o efeito da aplicação de boro sobre o incremento do diâmetro do caule no ponto de enxertia, 5 cm acima do coleto, número e diâmetro de raízes laterais e estado nutricional de porta-enxertos para produção de toco enxertado de raiz nua

Value of routine ultrasound examination at 35–37 weeks' gestation in diagnosis of non‐cephalic presentation

Background: Undiagnosed non-cephalic presentation in labor carries increased risks for both the mother and baby. Routine pregnancy care based on maternal abdominal palpation fails to detect the majority of non-cephalic presentations. Objective: To report the incidence of non-cephalic presentation at a routine scan at 35+0 - 36+6 weeks’ gestation and subsequent management of such pregnancies. Methods: This was a retrospective analysis of prospectively collected data in 45,847 singleton pregnancies that had undergone routine ultrasound examination at 35+0 - 36+6 weeks’ gestation. Patients with breech or transverse / oblique presentation were divided into two groups, first those that would have elective cesarean section for fetal or maternal indications other than the abnormal presentation, and second, those that would potentially require ECV. The latter group was reassessed in 1-2 weeks and if there was persistence of the abnormal presentation the parents were offered the options of ECV versus elective cesarean section at 38-40 weeks’ gestation. Multivariable logistic regression analysis was carried out to determine which of the factors from maternal and pregnancy characteristics provided a significant contribution in the prediction of first, non-cephalic presentation at the 35+0 - 36+6 weeks scan, second, successful ECV from non-cephalic to cephalic presentation, and third, spontaneous rotation from non-cephalic to cephalic presentation. Results: First, at 35+0 - 36+6 weeks the fetal presentation was cephalic in 43,416 (94.7%) pregnancies, breech in 1,987 (4.3%) and transverse or oblique in 444 (1.0%). Second, multivariable analysis demonstrated that the chance of non-cephalic presentation increased with increasing maternal age and weight, decreasing height, earlier gestational age at scan, and it was higher in the presence of placenta previa, oligohydramnios and polyhydramnios, in nulliparous than parous women and lower in women of South Asian and mixed racial origin than in White women. Third, 22% of cases of non-cephalic presentation were not eligible for ECV because of planned cesarean section for indications other than the malpresentation. Fourth, of those eligible for ECV only 48.5% (646/1,332) accepted the procedure and this was successful in 39.0% (252/646) of cases. Fifth, the chance of successful ECV increased with increasing maternal age and was lower in nulliparous than parous women. Sixth, in 33.9% (738/2,179) of pregnancies with non-cephalic presentation where successful ECV was not carried out there was a subsequent spontaneous rotation to cephalic presentation. Seventh, the chance of spontaneous rotation from non-cephalic to cephalic presentation increased with increasing interval between the scan and delivery and decreased with increasing birth weight, it was higher in women of Black than White racial origin, if the presentation was transverse or oblique than breech and if there was polyhydramnios and lower in nulliparous than parous women and in the presence of placenta previa. Eighth, in 109 (0.3%) of cephalic presentations there was subsequent rotation to non-cephalic presentation and in 41% of these the diagnosis was made during labor. Ninth, in the total of 2,431 cases of non-cephalic presentation at the time of the scan the presentation at birth was cephalic in 985 (40.5%); in 738 (74.9%) this was due to spontaneous rotation and in 247 (25.1%) due to successful ECV. Tenth, prediction of non-cephalic presentation at the 35+0 - 36+6 weeks scan and successful ECV from maternal and pregnancy factors was poor, but prediction of spontaneous rotation from non-cephalic to cephalic presentation was moderately good and this could be incorporated in the counselling of women prior to undertaking ECV. Conclusions: The problem of unexpected non-cephalic presentation in labor can to a great extent be overcome by a routine ultrasound examination at 35+0 - 36+6 weeks’ gestation. The incidence of non-cephalic presentation at the 35+0 - 36+6 weeks scan was about 5%, but, in about 40% of these cases the presentation at birth was cephalic, mainly due to subsequent spontaneous rotation and to a lesser extent as a consequence of successful ECV

Sistemas de produção: conceitos e definições no contexto agrícola.

Introdução. Definições e exemplificações de sistemas: Sistema de cultivo, Sistema de produção, Sistema em monocultura ou produção isolada; Sistema em sucessão de culturas; Sistema em consorciação de culturas ou policultivo; Sistema em integração: lavoura-pecuária, lavoura-floresta, pecuária-floresta, lavoura-pecuária-floresta. Ausência de interação. Interação entre sistemas de cultivo/criação conduzidos em diferentes áreas físicas. Interação entre sistemas de cultivo/criação conduzidos em um mesmo espaço físico. Sistema agrícola: sistema de sucessão soja - milho/trigo em SPD na região de Londrina-PR; sistema de sucessão soja - milho/sorgo em SPD na região de Rio Verde-GO; sistema de rotação soja-trigo (ano 1); soja-aveia ou nabo forrageiro (ano 2); milho-nabo forrageiro-trigo (ano 3); e soja-aveia (ano 4), em SPD na região de Passo Fundo-RS. sistema de sucessão soja ? milho/algodão em SPD na região de Sapezal-MT; sistema de sucessão soja - girassol/sorgo em SPD na região de Campo Novo do Parecis-MT; sistema de integração arroz irrigado-azevém para pastejo, na região de Pelotas-RS. sistema de sucessão de cana-de-açúcar com cultivo de amendoim durante o período de reforma do canavial na região de Sertãozinho-SP. sistema de sucessão de cana-de-açúcar com cultivo de Crotalaria spectabilis durante o período de reforma do canavial na região de Coruripe-AL. Bioma. Considerações finais.bitstream/item/69333/1/Doc-335-OL.pd

Estudo hidrogeológico ambiental em região cárstica no município de Sete Lagoas - Minas Gerais: comportamento de nitratos e da atrazina.

O presente estudo, de natureza hidrogeológica ambiental, está sendo conduzido no campo experimental agrícola do Centro Nacional de Pesquisa de Milho e Sorgo-CNPMS, da Embrapa, em Sete Lagoas, Minas Gerais, através de um convênio firmado com o Departamento de Engenharia Sanitária e Ambiental, da Universidade Federal de Minas Gerais, DESAlUFMG, e a Companhia de Saneamento de Minas Gerais-COP ASA. Trata-se da caracterização hidrogeoquímica do sistema aqüífero local e do estabelecimento de um modelo de fluxo de águas subterrâneas, e de transporte de contaminantes, no entorno da área experimental do CNPMS, com foco nos possíveis cenários de contaminação dessas águas por nitratos e atrazina, cujas origens se devem à aplicação intensiva destes compostos em cultivos experimentais, principalmente de milho, soja e sorgo, conduzidos a pelo menos quatro décadas naquele local. A área está inserida nas microbacias dos ribeirões Matadouro e Jequitibá, afluentes perenes do rio das Velhas, onde predominam latos solos vermelhos distróficos, em uma região cárstica, no domínio geológico de caleários do Grupo Bambuí

Enraizamento de estacas de urucuzeiro Bixa orellana L.

bitstream/item/34014/1/CPATU-CirTec55-2.pd

Edge phonons in black phosphorus

Exfoliated black phosphorus has recently emerged as a new two-dimensional crystal that, due to its peculiar and anisotropic crystalline and electronic band structures, may have potentially important applications in electronics, optoelectronics and photonics. Despite the fact that the edges of layered crystals host a range of singular properties whose characterization and exploitation are of utmost importance for device development, the edges of black phosphorus remain poorly characterized. In this work, the atomic structure and the behavior of phonons near different black phosphorus edges are experimentally and theoretically studied using Raman spectroscopy and density functional theory calculations. Polarized Raman results show the appearance of new modes at the edges of the sample, and their spectra depend on the atomic structure of the edges (zigzag or armchair). Theoretical simulations confirm that the new modes are due to edge phonon states that are forbidden in the bulk, and originated from the lattice termination rearrangements.Comment: 15 pages, 4 figure