Competição de cultivares de feijão caupi de habito ramador em solos de cerrado do Amapá/1983.

Os solos dos campos cerrados do Amapá, apesar de pouco explorados com culturas alimentares de ciclo curto, são potencialmente capazes de serem utilizados para esse fim, desde de que manejados adequadamente. Procurando oferecer opções de uso dessas áreas, a EMBRAPA vem conduzindo estudos de avaliação de diversos genotipos de feijão caupi de habito ramador, visando identificar materiais que se adaptem a essas formações ecologicas e apresentem boas características de produtividade, além de resistência a doenças e pragas.bitstream/item/65021/1/AP-1984-competicao-cultivares-feijao-caupi.pd

Competição de cultivares de feijão caupi de habito ramador em área de mata do Amapá - 1983.

A região norte participa com menos de 2% da produção brasileira de feijão Phaseolus e de caupi (Vigna), sendo que o Estado do Pará contribui com mais de 50% desse total, seguindo-se os Estados de Rondônia, Acre e Amazonas, com 25%, 17% e 8%, respectivamente. A produção do Amapá e insignificante, nem sendo considerada para efeito de calculo da produção regional.bitstream/item/65009/1/AP-1984-competicao-cultivares-feijao-caupi-ramador.pd

Competição de cultivares de feijão caupi da habito arbustivo em área de mata do Amapá/1983.

A produção de feijão caupi no Amapá e pouco expressiva, entretanto, o seu cultivo e de grande importância devido ser uma das fontes de proteína, de origem vegetal, mais consumidas nas zonas rurais e na periferia dos centros urbanos do Território.bitstream/item/74282/1/AP-1984-competicao-cultivares-feijao-caupi.pd

Soil loss by wind (SoLoWind): a new GIS-based model to identify risk areas

The focus of wind erosion studies in Germany is located in the Northern and Eastern parts of the country, where wind erosion is a major soil threat and environmental concern. One of the most susceptible regions not only within Germany, but also within Europe (1, 2) is Western Saxony even though no high resolution erosion risk map exists for that region yet. A new wind erosion model for modeling soil loss by wind called SoLoWind was developed and tested for Western Saxony (3). SoLoWind extends the existing DIN model (DIN standard 19706) applied by the public authorities in Germany to a multidirectional model with new causal factors. The new factors are combined by fuzzy logic with the original DIN factors into four modules. The “Natural Wind Erosions Susceptibility” (SUS) module determines the regional soil erodibility with respect to soil texture, soil organic content, soil moisture and wind speeds. A “Soil Cover” (COV) module distinguishes between bare soil and covered soil in satellite images. Furthermore, the modules “Mean Field Length” (MFL) and “Mean Protection Zones” (MPZ) are parameters for the wind erosions avalanching effect and sheltering of windbreaks. Both modules are weighted according to the frequency of wind directions. The application showed that about one-third of all arable land in Western Saxony have either high (26.9%) or very high soil erosion risk (3.6%) by wind. As such, wind erosion is a serious land degradation threat for the region as it is in the adjacent federal states. According to the modeled off-site effects of wind erosion, a potential danger of reduced visibility by windblown dust to sections of the highway A72 could clearly be identified which calls for immediate protection measures. The transparency, adaptability, and user-friendliness of the model suggest that SoLoWind might serve as a planning tool for soil conservation strategies not merely in Western Saxony, but also in other regions

Uso do processo oxidativo avançado na degradação de mistura de resíduos orgânicos coloridos provenientes de análises espectrofotométricas.

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Spillover and diffraction sidelobe contamination in a double-shielded experiment for mapping Galactic synchrotron emission

We have analyzed observations from a radioastronomical experiment to survey the sky at decimetric wavelengths along with feed pattern measurements in order to account for the level of ground contamination entering the sidelobes. A major asset of the experiment is the use of a wire mesh fence around the rim-halo shielded antenna with the purpose of levelling out and reducing this source of stray radiation for zenith-centered 1-rpm circular scans. We investigate the shielding performance of the experiment by means of a geometric diffraction model in order to predict the level of the spillover and diffraction sidelobes in the direction of the ground. Using 408 MHz and 1465 MHz feed measurements, the model shows how a weakly-diffracting and unshielded antenna configuration becomes strongly-diffracting and double-shielded as far-field diffraction effects give way to near-field ones. Due to the asymmetric response of the feeds, the orientation of their radiation fields with respect to the secondary must be known a priori before comparing model predictions with observational data. By adjusting the attenuation coefficient of the wire mesh the model is able to reproduce the amount of differential ground pick-up observed during test measurements at 1465 MHz.Comment: 14 pages, 17 eps + 1 gif figures and 4 Tables. Accepted for publication in A&AS. Fig.7 available at full resolution from http://www.das.inpe.br/~tello/publications.ht

Symmetry breaking, Josephson oscillation and self-trapping in a self-bound three-dimensional quantum ball

We study spontaneous symmetry breaking (SSB), Josephson oscillation, and self-trapping in a stable, mobile, three-dimensional matter-wave spherical quantum ball self-bound by attractive two-body and repulsive three-body interactions. The SSB is realized by a parity-symmetric (a) one-dimensional (1D) double-well potential and (b) a 1D Gaussian potential, both along the $z$ axis and no potential along the $x$ and $y$ axes. In the presence of each of these potentials, the symmetric ground state dynamically evolves into a doubly-degenerate SSB ground state. If the SSB ground state in the double well, predominantly located in the first well ($z>0$), is given a small displacement, the quantum ball oscillates with a self-trapping in the first well. For a medium displacement one encounters an asymmetric Josephson oscillation. The asymmetric oscillation is a consequence of SSB. The study is performed by a variational and numerical solution of a non-linear mean-field model with 1D parity-symmetric perturbations