Resposta espectral e estimativa remota do vigor de variedades de videira no manejo sítio-específico dos cultivos de uvas para vinhos finos.

Para que o setor vitivinícola brasileiro possa competir no mercado mundial, as vinícolas brasileiras vêm se modernizando e os viticultores têm buscado formas de otimizar a qualidade da matéria-prima. O manejo das áreas heterogêneas dentro de um vinhedo, apoiado em geotecnologias, tem permitido a produção de vinhos de maior qualidade em outros países. Neste trabalho apresenta-se a análise da resposta espectral das variedades de videira e os subsequentes passos a serem implementados para o manejo sítio-específico dos vinhedos. Regiões de maior importância com relação à discriminação de variedades foram identificadas, caminhando-se agora para a correlação destes dados e de dados orbitais com as características fisiológicas das plantas e de qualidade das uvas. Palavras-chave: espectroradiometria; sensoriamento remoto; variedades de Vitis spp. Abstract To compete in the world trade market, the Brazilian wine sector is accommodating its industries and wineries to modern usages and the grape growers are now searching new forms to optimize the quality of their raw material. In other countries, the management of heterogeneous areas within the vineyards, supported by geotecnologies, has allowed the roduction of more quality wines in other countries. This paper presents the analysis of the spectral response of grapevine varieties and the subsequent steps to be implemented for the specific-site management of the vineyards. Regions of major importance in the varieties discrimination have been identified, what is going to be followed by the correlation of these and orbital data with the plants physiological characteristics and grape quality. Keywords: spectroradiomety; remote sensing; Vitis spp. varieties

Classificação de imagens RapidEye baseada em objetos e análise da ecologia de paisagens como suporte ao componente geoespacial do Inventário Florestal Nacional.

Resumo

Dissipative Dynamics of Matter Wave Soliton in Nonlinear Optical Lattice

Dynamics and stability of solitons in two-dimensional (2D) Bose-Einstein condensates (BEC), with low-dimensional (1D) conservative plus dissipative nonlinear optical lattices are investigated. In the case of focusing media (with attractive atomic systems) the collapse of the wave packet is arrested by the dissipative periodic nonlinearity. The adiabatic variation of the background scattering length leads to metastable matter-wave solitons. When the atom feeding mechanism is used, a dissipative soliton can exist in focusing 2D media with 1D periodic nonlinearity. In the defocusing media (repulsive BEC case) with harmonic trap in one dimension and one dimensional nonlinear optical lattice in other direction, the stable soliton can exist. This prediction of variational approach is confirmed by the full numerical simulation of 2D Gross-Pitaevskii equation.Comment: 9 pages, 8 figure

On the accumulation of organic matter on the southeastern Brazilian continental shelf: A case study based on a sediment core from the shelf off Rio de Janeiro

Sterol and fatty acid biomarkers and isotopic composition (delta 13C and delta 15N) of bulk organic matter (OM) were quantified in a sediment core to characterize the accumulation of autochthonous OM in an area on the continental shelf adjacent to Rio de Janeiro State. In the sediment surface (0-1 cm) the concentration of total sterols and fatty acids was at least one order of magnitude higher than that measured deeper down in the core and was dominated by labile and planktonic-derived biomarker compounds. These results suggest, as is confirmed by multivariate statistical analysis, the occurrence of an event of enhanced primary production in the water column and efficient export of particles to the bottom. Similar conditions have been observed at Cabo Frio, located 150 km to the north of our study site, during an upwelling event, suggesting that such events may exert a regional influence on primary production on the south-eastern Brazilian continental shelf. Beyond the signatures from this event, the presence of biomarker compounds from vascular plants suggests the additional influence of an outflow from Guanabara Bay at the study site. These results point to the need for further investigation of the relative influence of physical forcings and continental inputs on the biogeochemical processes on the section of the continental shelf considered in the present study

Lâmina de água para o feijoeiro em Cristalina, GO.

Este trabalho teve por objetivo determinar a lâmina de água média a ser utilizada no outono/inverno por um sistema de irrigação por aspersão, considerando o período de semeadura na região

Quantum chaos in nanoelectromechanical systems

We present a theoretical study of the electron-phonon coupling in suspended nanoelectromechanical systems (NEMS) and investigate the resulting quantum chaotic behavior. The phonons are associated with the vibrational modes of a suspended rectangular dielectric plate, with free or clamped boundary conditions, whereas the electrons are confined to a large quantum dot (QD) on the plate's surface. The deformation potential and piezoelectric interactions are considered. By performing standard energy-level statistics we demonstrate that the spectral fluctuations exhibit the same distributions as those of the Gaussian Orthogonal Ensemble (GOE) or the Gaussian Unitary Ensemble (GUE), therefore evidencing the emergence of quantum chaos. That is verified for a large range of material and geometry parameters. In particular, the GUE statistics occurs only in the case of a circular QD. It represents an anomalous phenomenon, previously reported for just a small number of systems, since the problem is time-reversal invariant. The obtained results are explained through a detailed analysis of the Hamiltonian matrix structure.Comment: 14 pages, two column

Aerial sketchmapping for monitoring forest conditions in Southern Brazil.

Aerial sketchmapping is a simple, low cost remote sensing method used for detection and mapping of forest damage caused by biotic agents (insects, pathogens and other pests) and abiotic agents (wind, fire, storms, hurricane, ice storms) in North America. This method was introduced to Brazil in 2001/2002 via a USDA Forest Service/EMBRAPA technical exchange program, which included demonstration flights, a feasibility study, workshops, production of satellite maps, observer training and operational flights, primarily for assessment of damage caused by European wood wasp (Sirex noctilio), monkeys (Cebus nigritus), armillaria root disease (Armillaria spp.), and other damaging agents in pine plantations in Southern Brazil. New applications have been investigated in the most recent campaigns, carried out in 2003 and 2004. These include the use of this technique to monitor land use changes, evaluate the accuracy of classifications from satellite imagery, and to classify successional phases in remnants of Araucaria angustifolia forests in Southern Brazil. The operational flights have demonstrated that clearcuts, land use change detection and other anthropogenic activities may be suitably mapped and monitored from the air. Future activities are aimed at consolidation of this technique in Brazil, the identification of other damage signatures, such as those caused by the eucalyptus red gum lerp psyllid (Glycaspis brimblecombei), and the use of digital aerial sketchmapping methods

Anomalous quantum chaotic behavior in nanoelectromechanical structures

It is predicted that for sufficiently strong electron-phonon coupling an anomalous quantum chaotic behavior develops in certain types of suspended electro-mechanical nanostructures, here comprised by a thin cylindrical quantum dot (billiard) on a suspended rectangular dielectric plate. The deformation potential and piezoelectric interactions are considered. As a result of the electron-phonon coupling between the two systems the spectral statistics of the electro-mechanic eigenenergies exhibit an anomalous behavior. If the center of the quantum dot is located at one of the symmetry axes of the rectangular plate, the energy level distributions correspond to the Gaussian Orthogonal Ensemble (GOE), otherwise they belong to the Gaussian Unitary Ensemble (GUE), even though the system is time-reversal invariant.Comment: 4 pages, pdf forma

Automatização da extração de informações de séries temporais Landsat-8 como subsídio ao estudo de paisagem no Inventário Florestal Nacional do Brasil (IFN-BR).

Resumo

Comportamento fisiológico de plantas de aveia (Avena strigosa) em solos com excesso de cobre.

bitstream/CNPUV/5743/1/cot049.pdfISSN 1516-809