Crônica dos Potenciais Vetor e Quântico.

Neste artigo, vamos apresentar o desenvolvimento histórico dos\ud conceitos dos potenciais vetor e quântico formulados, respectivamente, por\ud Maxwell e Bohm. Em suas concepções iniciais, eles foram considerados\ud apenas como um artifício matemático. Contudo, enquanto o potencial vetor já\ud apresenta uma grande evidência experimental (efeito Aharonov-Bohm) sobre\ud a sua interpretação física, o potencial quântico ainda aguarda a sua, muito\ud embora esse efeito e alguns resultados teóricos sinalizem a sua existência\ud física. Este artigo já foi publicado na revista MensAgitat vol.1(2),pp.93-\ud 108(2006) da Academia Roraimense e Paraense de Ciências. Está sendo\ud publicado novamente como e-print no IFUSP para que ele tenha uma\ud divulgação mais ampla e mais ágil pela internet

Animal performance in oat and Italian ryegrass pastures under leaf lamina biomass levels

O objetivo deste trabalho foi avaliar o efeito de biomassas de lâminas foliares no desempenho animal. Utilizou-se mistura de aveia (Avena strigosa Schreb) e azevém (Lolium multiflorum Lam.), para determinar quantidades adequadas de sua biomassa no manejo da pastagem. Foram realizados dois experimentos, na estação fria de 2002 e 2003. Na avaliação de 2002, os valores de biomassa de lâminas foliares foram de 360 kg ha-1 (baixa) e 630 kg ha-1 (alta). Em 2003, foram obtidas biomassas de 352, 422 e 507 kg ha-1, classificadas como baixa, média e alta, respectivamente. O método de pastejo foi contínuo, com taxa de lotação variada; os animais utilizados foram terneiros da raça Charolês e cruzados com Nelore, com idade inicial de nove meses. As variáveis de produção animal avaliadas, nos dois anos, foram: ganho médio diário, carga animal e ganho de peso vivo por área. As distintas biomassas de lâminas foliares mantidas não são fatores limitantes ao desempenho animal.The objective of this work was to evaluate the effect of different leaf lamina biomass over animal performance. A mixture of oat (Avena strigosa Schreb) and Italian ryegrass (Lolium multiflorum Lam.) was used to determine adequate levels of leaf lamina biomass for pasture management. Two trials were made, in 2002 and 2003 cool seasons. In 2002 evaluation, leaf lamina biomass values were of 360 kg ha-1 (low) and 630 kg ha-1 (high). In 2003, values obtained for leaf lamina biomasses were of 352, 422 and 507 kg ha-1, being classified as low, medium and high, respectively. Grazing method was continuous, with variable stocking rate; testing animals were calves of Charolais breed and its crosses with Nelore breed, with initial age of nine months. Evaluated variables in animal production, in both years, were: average daily gain, stocking rate and live weight gain per area. Leaf lamina biomasses evaluated are not limiting factors to animal performance

Heterogeneity of linalool chemotypes of Lippia alba (Mill.) N.E.Br., based on clonal half-sib progenies

Lippia alba (Mill.) N.E.Br. is an aromatic and medicinal shrub native to the American continent. Despite its potential as a source of essential oil for the pharmaceutical and cosmetics industries, few selection and genetic improvement studies have been carried out. The aim of this study was to provide genetic information on this species for breeding programs, showing its selection potential, by investigating clonal half-sib progenies. The following characteristics were evaluated per plant: leaf dry mass (LDM), total dry mass (TDM), leaf yield (LY), essential oil yield (EOY) and oil production (OP). Estimates were made for the several genetic parameters including absolute genetic gain at 30% selection intensity, correlations and relative contribution of additive and environmental effects to phenotypic correlation. Two experimental trials on 30 progenies were conducted: one in Campinas, state of São Paulo (SP), Brazil, with two harvests of the aerial part, and one in Monte Alegre do Sul, SP, Brazil, with only one harvest. The trials were conducted in a randomized block design consisting of subplots with three replications, each plot (progeny) consisting of 8 to 15 clonally-replicated plants with subplot harvesting. Variations were detected between progenies and harvests, as well as progeny/harvest interactions in the split plot experiment. High heritability and genetic gains were obtained at both sites for LDM, TDM and OP. The lowest variations among progenies were obtained for LY and EOY, highlighting selection problems. Negative additive genetic correlations were obtained for EOY × LDM, EOY × TDM, LY × TDM and LY × LDM. Selection for LDM resulted in increased oil production per plant (OP), even where there was a negative correlation between LDM × EOY

Percutaneous treatment for waist and proximal pole scaphoid fractures

ABSTRACT Objective: Analyze the percutaneous fixation technique for scaphoid fractures in the waist of the scaphoid and the proximal pole, and demonstrate its result. Methods: A retrospective cross-cohort study conducted from January 2005 to April 2015, aiming at the consolidation time, epidemiological profile, level of function, return to work, and complications. Results: Twenty-eight patients were selected, with a mean of eight weeks of follow-up. They presented a mean age of 30.5 years, male prevalence (25 patients; 89.2%), and no differences between dominant and non-dominant sides. The mean time from diagnosis was 4.16 weeks, but in three cases of fibrous union, the pre-operative period was over one year. The most frequent mechanism of injury was a fall on the outstretched hand, in 22 cases (78.5%). Of all fractures, 24 cases were in the waist (85.8%) and four were of the proximal pole (14.2%); seven patients had displacement (25%). There was consolidation in 26 cases (92.8%) with a mean of 7.5 weeks after surgery. In cases of non-union, radiological follow-up was up to 24 weeks, requiring a new surgical intervention. Conclusions: Percutaneous fixation is an excellent, reproducible technique that allows early active mobility of the wrist with a low complication rate, although it requires a learning curve

Extraction of crop information through the spatiotemporal fusion of OLI and MODIS images

Spatiotemporal data fusion algorithms have been developed to fuse satellite imagery from sensors with different spatial and temporal resolutions and generate predicted imagery. In this study, we compare the predictions of three spatiotemporal data fusion algorithms in blending Landsat-8/OLI and Terra-Aqua/MODIS images for mapping soybean and corn under five classification scenarios. The Spatial and Temporal Adaptive Reflectance Fusion Model (STARFM), Enhanced Spatial and Temporal Adaptive Reflectance Fusion Model (ESTARFM), and Flexible Spatiotemporal Data Fusion (FSDAF) algorithms were compared to generate images for the 2016/2017 summer crop-year. Classifications including phenological metrics extracted from FSDAF- and STARFM-predicted EVI time series had overalls accuracies higher than the other scenarios, 93.11% and 91.33%, respectively. The results show that phenological metrics extracted from predicted images are an interesting alternative to overcome cloud cover frequency limitations for soybean and corn mapping in tropical areas

The Linear Potential Propagator via Wave Function Expansion

We evaluate the quantum propagator for the motion of a particle in a linear potential via a recently developped formalism [A.B. Nassar et al., Phys. Rev. E56, 1230, (1997)]. In this formalism, the propagator comes about as a type of expansion of the wave function over the space of the initial velocities