Standard map in magnetized relativistic systems: fixed points and regular acceleration

We investigate the concept of a standard map for the interaction of relativistic particles and electrostatic waves of arbitrary amplitudes, under the action of external magnetic fields. The map is adequate for physical settings where waves and particles interact impulsively, and allows for a series of analytical result to be exactly obtained. Unlike the traditional form of the standard map, the present map is nonlinear in the wave amplitude and displays a series of peculiar properties. Among these properties we discuss the relation involving fixed points of the maps and accelerator regimes.Comment: Work to appear in Phys. Rev. E. 2 figure

Improvement in soybean sprouts production with ultrasound power.

The present work aimed the application of different ultrasound powers (10, 50 and 90W) to evaluate the germination and characteristics of soybean sprouts fromsoybeans of cultivar BRS 216 and 3 lines (A, B and C). In the germination test,the line A showed the highest percentage of germination (96% for 90W).The cultivar BRS 216 and line A present lower values of weight and higher yield of sprouts. The viable sprouts that presented the highest weight (for each 50g of soybean) were: line A followed by BRS 216, line C and B, with statistical differences (p<0.05) between them. For each 50g of soybean of cultivar BRS 216 and Lines A, B and C the production of viable sprouts was 231.47; 237.87; 170.74 and 199.94g, respectively, for 90W. In relation to the length of the sprouts using the power of 10W the line C presented a longer length. The line A using 90W showed better color characteristics. The highest protein value was found in cultivar BRS 216, for all applied potencies. With this work it can be concluded that the line A would be the most suitable for sprout production regardless of the ultrasound power applie

Ingroup projection as a challenge of diversity: consensus about and complexity of superordinate categories

As is often done, we could begin such a chapter in a volume on intergroup conflict with a dire description of the state of human society and the continuing menace of social discrimination, prejudice, injustice, and ethnic violence. However, a children's book by the Austrian writer Edith Schreiber-Wicke (1990), whose title may be translated as “When the crows were still colorful,” provides a fable that is more fun, yet insightful. It describes the story of the crows when they still came in all sorts of colors and patterns – orange with blue stripes, green with yellow spots, and so on – until one day a snowman asked the fateful (and probably spiteful) question of what a real, true crow looked like. Now the yellow-with-blue-spotted crows declared yellow with blue spots was the true color of crows, but the lilac crows argued the ur-crow was lilac colored, and all the other crows also claimed their colors were the real ones. There was arguing and quarreling; the crows began to fly with like-colored others only. The fighting ended only when one day a black rain turned all animals black. Afterward, only the crows stayed black and no longer had a reason to argue. The moral of the story? Obviously: ingroup projection is a challenge of diversity! And if we do not want to buy social harmony with dull sameness, we had better think of a more creative way to appreciate and enjoy differences. Ingroup projection is the perception or claim that one's own group is more prototypical for a higher-order superordinate identity, hence more normative and positive, than a relevant comparison outgroup is, or more prototypical at least than the outgroup thinks the ingroup is. In the present chapter, we briefly outline the ingroup projection model (IPM; Mummendey & Wenzel, 1999; Wenzel, Mummendey, & Waldzus, 2007), discuss its key concepts and relevant recent findings, and essentially argue for two ways in which we need to construe our superordinate identities to reduce tension between diverse and divergent groups included in them: We need to advance consensus about the superordinate identity in question, and about the complexity of its representation.info:eu-repo/semantics/acceptedVersio

Universality of dispersive spin-resonance mode in superconducting BaFe2As2

Spin fluctuations in superconducting BaFe2(As1-xPx)2 (x=0.34, Tc = 29.5 K) are studied using inelastic neutron scattering. Well-defined commensurate magnetic signals are observed at ({\pi},0), which is consistent with the nesting vector of the Fermi surface. Antiferromagnetic (AFM) spin fluctuations in the normal state exhibit a three-dimensional character reminiscent of the AFM order in nondoped BaFe2As2. A clear spin gap is observed in the superconducting phase forming a peak whose energy is significantly dispersed along the c-axis. The bandwidth of dispersion becomes larger with approaching the AFM ordered phase universally in all superconducting BaFe2As2, indicating that the dispersive feature is attributed to three-dimensional AFM correlations. The results suggest a strong relationship between the magnetism and superconductivity.Comment: 5 pages, 5 figure

Quantificação não destrutiva do contéudo de clorofilas em folhas de milho através de método colorimétrico.

Este trabalho foi conduzido visando avaliar a viabilidade da utilização de um colorímetro, como alternativa ao medidor de clorofila para a quantificação não destrutiva de clorofilas em folhas de milho.Suplemento. Trabalho apresentado no 52. Congresso Brasileiro de Olericultura, Salvador, 2012

Enantioselective PCCP Brønsted acid-catalyzed aza-Piancatelli rearrangement.

An enantioselective aza-Piancatelli rearrangement has been developed using a chiral Brønsted acid based on pentacarboxycyclopentadiene (PCCP). This reaction provides rapid access to valuable chiral 4-amino-2-cyclopentenone building blocks from readily available starting material and is operationally simple

Experimentally exploring compressed sensing quantum tomography

In the light of the progress in quantum technologies, the task of verifying the correct functioning of processes and obtaining accurate tomographic information about quantum states becomes increasingly important. Compressed sensing, a machinery derived from the theory of signal processing, has emerged as a feasible tool to perform robust and significantly more resource-economical quantum state tomography for intermediate-sized quantum systems. In this work, we provide a comprehensive analysis of compressed sensing tomography in the regime in which tomographically complete data is available with reliable statistics from experimental observations of a multi-mode photonic architecture. Due to the fact that the data is known with high statistical significance, we are in a position to systematically explore the quality of reconstruction depending on the number of employed measurement settings, randomly selected from the complete set of data, and on different model assumptions. We present and test a complete prescription to perform efficient compressed sensing and are able to reliably use notions of model selection and cross-validation to account for experimental imperfections and finite counting statistics. Thus, we establish compressed sensing as an effective tool for quantum state tomography, specifically suited for photonic systems.Comment: 12 pages, 5 figure

Inoculação de bactérias fixadoras de nitrogênio em arroz de sequeiro (Oryza sativa): respostas fisiológicas em estudos in vitro.

Este estudo determinou as respostas fisiológicas de 10 variedades de arroz de sequeiro (Oryza sativa L.) inoculação utilizando bactérias fixadoras de nitrogênio em ensaios in vitro