6,417 research outputs found
Irrigated rice area estimation using remote sensing techniques: Project's proposal and preliminary results
The development of a methodology for annual estimates of irrigated rice crop in the State of Rio Grande do Sul, Brazil, using remote sensing techniques is proposed. The project involves interpretation, digital analysis, and sampling techniques of LANDSAT imagery. Results are discussed from a preliminary phase for identifying and evaluating irrigated rice crop areas in four counties of the State, for the crop year 1982/1983. This first phase involved just visual interpretation techniques of MSS/LANDSAT images
Efeitos de micronutrientes em capim colonião (Panicum maximum, Jacq.) cultivado num solo de campo cerrado.
Utilizando-se de um solo de campo cerrado (Latosol Vermelho Amarelo - fase arenosa), que nunca recebeu qualquer adubação, instalou-se este experimento em vasos, em casa de vegetação, com a finalidade de se verificar a influencia dos micronutrientes: Manganês, molibdenio, cobre, zinco e boro, sobre o desenvolvimento do capim colonia
Identifying the Higgs Boson in Electron--Photon Collisions
We analyze the production and detection of the Higgs boson in the next
generation of linear colliders operating in the mode. In
particular, we study the production mechanism , where one photon is generated via the laser
backscattering mechanism, while the other is radiated via the usual
bremsstrahlung process. We show that this is the most important mechanism for
Higgs boson production in a GeV collider for
M_H\raisebox{-.4ex}{\rlap{\sim}} \raisebox{.4ex}{>}140 GeV. We also study
the signals and backgrounds for detection of the Higgs in the different decay
channels, , , and , and suggest kinematical cuts to
improve the signature of an intermediate mass Higgs boson.Comment: (REVTEX 2.0, 12 pages and 9 figures available upon request, Preprint
MAD/PH/753
On the resonance eigenstates of an open quantum baker map
We study the resonance eigenstates of a particular quantization of the open
baker map. For any admissible value of Planck's constant, the corresponding
quantum map is a subunitary matrix, and the nonzero component of its spectrum
is contained inside an annulus in the complex plane, . We consider semiclassical sequences of eigenstates, such that the
moduli of their eigenvalues converge to a fixed radius . We prove that, if
the moduli converge to , then the sequence of eigenstates
converges to a fixed phase space measure . The same holds for
sequences with eigenvalue moduli converging to , with a different
limit measure . Both these limiting measures are supported on
fractal sets, which are trapped sets of the classical dynamics. For a general
radius , we identify families of eigenstates with
precise self-similar properties.Comment: 32 pages, 2 figure
Order of strength exercises on the performance of judo athletes
OBJETIVO: El objetivo fue investigar el efecto del orden distintas de
ejercicios de fuerza para extremidades superiores e inferiores en el rendimiento
específico de judokas junior. MÉTODO: Se divide una muestra de 39 atletas
masculinos en tres grupos: Experimental-EG1; EG2 y Control. Los Grupos
realizaron ejercicios de fuerza máxima y potencia con intensidades del 80-90%
para 12 semanas de intervención. El orden de los ejercicios para el EG1 fue del
de extremidades superiores primero e inferiores después. El EG2 realiza los
mismos ejercicios en secuencia inversa. Se utilizó la Prueba Especial Judo
Fitness (SJFT) para evaluación. RESULTADOS: Los experimentos intra e inter
grupos muestran diferencias (p<0.05) en los derribos-caídas y en el índice SJFT,
con EG2 mostrando mejores resultados. CONCLUSIONES: Las variables de
SJFT tuvieron mejores resultados en el orden de ejercicios seguidos por el EG2OBJECTIVE: To analyze the effect of strength exercises using different orders
for upper and lower limbs on the specific performance of junior judo athletes.
METHODS: 39 male athletes were divided into three groups: experimental-
EG1, experimental-EG2 and control group. Experimental groups performed with
intensities 80-90% of strength and power for 12 weeks. The exercise-order for
EG1 followed an upper to lower limb sequence and EG2 performed the same
exercises in reverse. The Special Judo Fitness Test (SJFT) was used in the
assessment. RESULTS: Experimental intra and inter-groups showed
differences (p<0.05) in the throws-falls and SJFT-index, but the EG2 showed
best results. CONCLUSIONS: The SJFT-variables had better results to
exercises order in EG
Quartic Anomalous Couplings in Colliders
We study the constraints on the vertices ,
, and that can be obtained from
triple-gauge-boson production at the next generation of linear
colliders operating in the mode. We analyze the processes
(, or ) and show that these reactions
increase the potential of machines to search for anomalous
four-gauge-boson interactions.Comment: 15 pages, Latex file using ReVteX, 4 uufiled figures include
Two-photon final states in peripheral heavy ion collisions
We discuss processes leading to two photon final states in peripheral heavy
ion collisions at RHIC. Due to the large photon luminosity we show that the
continuum subprocess can be observed with a
large number of events. We study this reaction when it is intermediated by a
resonance made of quarks or gluons and discuss its interplay with the continuum
process, verifying that in several cases the resonant process ovewhelms the
continuum one. It is also investigated the possibility of observing a scalar
resonance (the meson) in this process. Assuming for the the
mass and total decay width values recently reported by the E791 Collaboration
we show that RHIC may detect this particle in its two photon decay mode if its
partial photonic decay width is of the order of the ones discussed in the
literature.Comment: 10 pages, 8 figure
Relação de Meloidogyne arenaria com o desenvolvimento radicular do porta-enxerto SO4. de videira
O objetivo deste trabalho foi avaliar a relação entre a presença de Meloidogyne arenaria no solo e o desenvolvimento radicular do porta-enxerto SO4 de videira. Foram avaliados, além deste porta-enxerto, o ?Harmony? e o ?IAC 766? por serem amplamente utilizados na vitivinicultura do Submédio do Vale do São Francisco. O enraizamento foi feito em solo autoclavado contido em sacos para formação de mudas. Após 40 dias, as mudas foram transplantadas para vasos com capacidade de 20 L, conforme os seguintes tratamentos: 1) solo natural -- infestado com M. arenaria -- 2) solo autoclavado e com inoculação das mudas e 3) solo autoclavado e sem inoculação das mudas com M. arenaria. Após 6 meses, nenhuma anormalidade foi observada, visualmente, no sistema radicular dos porta-enxertos avaliados. Observou-se que o nematoide não se multiplicou de forma diferenciada nos três porta-enxertos, mas que o porta-enxerto ?Harmony? pode vir a se tornar uma opção de substituição do ?SO4? por se apresentar com tendências a maior vigor do sistema radicular, visto não ter ocorrido diferença significativa no número de ovos quantificados nos três porta-enxertos
Apresentando alguns aspectos históricos do desenvolvimento da lógica clássica, ciência das idéias e dos processos da mente
Lógica é a ciência que tem por objeto determinar,
entre as operações intelectuais orientadas para o
conhecimento da verdade, as que são válidas e as que não
são. Estuda os processos e as condições de verdade de todo
e qualquer raciocínio. O conhecimento só é científico
quando, além de universal, é metódico e sistemático, ou
seja, lógico. Assim, a lógica se entende como método, ou
caminho que as ciências trilham para determinar e conhecer
seu objeto, e como característica geral do conhecimento
científico
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