3,660 research outputs found
Controle quÃmico da Mancha de Ramulária do algodoeiro, causada por Ramulária areola, em função da idade da planta e da severidade da doença - safra 2003-2004.
bitstream/CNPA/19718/1/BOLETIM58.pd
Acute Cervical Epidural Hematoma: Case Report.
A 74 year-old patient with a nocturnal onset of neck and chest pain was brought to an emergency clinic. Physical examination and cardiac assessment were normal. Three hours after the addmittance, a flaccid paralysis of the four limbs supervened. Suspecting of an unusual onset of central nervous system infection, a lumbar puncture was performed, yielding 20 ml of normal cerebrospinal fluid. Thirty oinutes after the puncture, the patient completely regained neurological funcion. He was then referred to a General Hospital where a computed tomography (CT) scan was done showing a large cervical epidural bleeding in the posterolateral region of C4/C5 extending to C7/Th1, along with a C6 vertebral body hemangioma. A magnetic resonance imaging revealed the same CT findings. A normal selective angiography of vertebral arteries, carotid arteries and thyreocervical trunk was carried out. Spontaneous spinal epidural hematoma (ASSEH) is a rare but dramatic cause of neurological impairment. In this article we report a fortunate case of complete recovery after an unusual spine cord decompression. We also review the current literature concerning diagnosis and treatment of ASSEH.58726-3
Composição mineral do resÃduo salino sólido de tanques aquÃcolas abastecidos com resÃduo da dessalinização.
O objetivo dessa pesquisa foi avaliar a composição mineral do resÃduo salino sólido (RSS) proveniente de dez tanques aquÃcolas, colhendo-se três amostras por tanque. Foram determinados os teores de N, K, Ca, Mg, S, B, Cu, Fe, Mn, Zn, Na, Cl, P, Ni, Pb, Cd, Cr. O RSS apresentou grande diversidade de elementos minerais, baixa concentração dos principais minerais presentes nos suplementos comerciais como o Ca e o P e heterogeneidade em suas composições com relação aos diferentes tanques. Foi ainda observada a presença de metais pesados, em que para o Pb e Cd os valores médios estão acima da faixa considerada normal, porém, em alguns dos tanques amostrados os valores são inferiores a faixa limite
Stochastic Quantization of Real-Time Thermal Field Theory
We use the stochastic quantization method to obtain the free scalar
propagator of a finite temperature field theory formulated in Minkowski
spacetime. First we use the Markovian stochastic quantization approach to
present the two-point function of the theory. Second, we assume a Langevin
equation with a memory kernel and Einstein's relations with colored noise. The
convergence of the stochastic processes in the asymptotic limit of the Markov
parameter of these Markovian and non-Markovian Langevin equations for a free
scalar theory is obtained. Our formalism can be the starting point to discuss
systems at finite temperature out of equilibrium
Uso de compostos orgânicos produzidos a partir de resÃduos da agropecuária como fertlizantes na cultura do milho.
A produção agropecuária e a agroindústria geram grandes quantidades de resÃduos orgânicos, que precisam ser corretamente descartados para evitar a ocorrência de danos ambientais. A reciclagem dos nutrientes desses resÃduos proporcionada pelo uso desses materiais como fertilizantes de culturas agrÃcolas é uma das estratégias para o manejo das grandes quantidades geradas no processo produtivo. Objetivou-se com este trabalho avaliar a eficiência agronômica de dois compostos orgânicos produzidos a partir de resÃduos de frigorÃfico (conteúdo ruminal) e de cama-de-aviário. Foram conduzidos experimentos em que os tratamentos consistiram em fertilização exclusivamente mineral, equivalente a 100 kg/ha de N (sulfato de amônio), 120 kg/ha de P2O5 (MAP) e 120 kg/ha de K2O (KCl), aplicação de um composto orgânico elaborado a partir de resÃduos de frigorÃfico e um outro composto orgânico elaborado com cama de aviário, nas doses equivalentes a 1 ton ha-1, 2 ton ha-1, 3 ton ha-1 e 4 ton ha-1, além da testemunha, sem fertilização. Para os tratamentos com fertilização orgânica houve complementação de nitrogênio e potássio em cobertura, de modo a se atingir os mesmos nÃveis desses elementos veiculados no tratamento de fertilização exclusivamente mineral. As respostas da cultura de milho a ambos compostos foram pouco pronunciadas, observando-se pouco ganho em relação à testemunha. Em ambos casos as respostas à s doses aplicadas de composto foram inferiores ao alcançado pela fertilização mineral
The Bekenstein Bound in Asymptotically Free Field Theory
For spatially bounded free fields, the Bekenstein bound states that the
specific entropy satisfies the inequality , where
stands for the radius of the smallest sphere that circumscribes the system. The
validity of the Bekenstein bound on the specific entropy in the asymptotically
free side of the Euclidean self-interacting scalar
field theory is investigated. We consider the system in thermal equilibrium
with a reservoir at temperature and defined in a compact spatial
region without boundaries. Using the effective potential, we presented an
exhaustive study of the thermodynamic of the model. For low and high
temperatures the system presents a condensate. We obtain also the renormalized
mean energy and entropy for the system. With these quantities, we shown
in which situations the specific entropy satisfies the quantum bound
Controlled coupling of counterpropagating whispering-gallery modes by a single Rayleigh scatterer: a classical problem in a quantum optical light
We present experiments where a single subwavelength scatterer is used to
examine and control the back-scattering induced coupling between
counterpropagating high-Q modes of a microsphere resonator. Our measurements
reveal the standing wave character of the resulting symmetric and antisymmetric
eigenmodes, their unbalanced intensity distributions, and the coherent nature
of their coupling. We discuss our findings and the underlying classical physics
in the framework common to quantum optics and provide a particularly intuitive
explanation of the central processes.Comment: accepted for publication in Pysical Review Letter
Topological energy barrier for skyrmion lattice formation in MnSi
We report the direct measurement of the topological skyrmion energy barrier
through a hysteresis of the skyrmion lattice in the chiral magnet MnSi.
Measurements were made using small-angle neutron scattering with a custom-built
resistive coil to allow for high-precision minor hysteresis loops. The
experimental data was analyzed using an adapted Preisach model to quantify the
energy barrier for skyrmion formation and corroborated by the minimum-energy
path analysis based on atomistic spin simulations. We reveal that the skyrmion
lattice in MnSi forms from the conical phase progressively in small domains,
each of which consisting of hundreds of skyrmions, and with an activation
barrier of several eV.Comment: Final accepted versio
Análise da estrutura populacional e determinação do fluxo gênico entre populações de arroz vermelho.
objetivo do trabalho foi caracterizar geneticamente populações de arroz vermelho do RS com suspeita de resistência aos herbicidas imidazolinonas e elucidar aspectos relacionados ao fluxo gênico de sementes entre diferentes locais
Agronomic efficiency of granular organomineral p fertilizers produced from poultry litter.
This paper has as aim to evaluate in the field the agronomic efficiency of phosphate organomineral fertilizers produced from poultry litter in relation to mineral phosphated fertilizers in a long-term experiment. The effect of composting on the litter quality for purposes of producing organomineral fertilizers was also evaluated
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