24,407 research outputs found
Towards a knowledge-based system to assist the Brazilian data-collecting system operation
A study is reported which was carried out to show how a knowledge-based approach would lead to a flexible tool to assist the operation task in a satellite-based environmental data collection system. Some characteristics of a hypothesized system comprised of a satellite and a network of Interrogable Data Collecting Platforms (IDCPs) are pointed out. The Knowledge-Based Planning Assistant System (KBPAS) and some aspects about how knowledge is organized in the IDCP's domain are briefly described
Generation of Superposition States and Charge-Qubit Relaxation Probing in a Circuit
We demonstrate how a superposition of coherent states can be generated for a
microwave field inside a coplanar transmission line coupled to a single
superconducting charge qubit, with the addition of a single classical magnetic
pulse for chirping of the qubit transition frequency. We show how the qubit
dephasing induces decoherence on the field superposition state, and how it can
be probed by the qubit charge detection. The character of the charge qubit
relaxation process itself is imprinted in the field state decoherence profile.Comment: 6 pages, 4 figure
Conservation law for distributed entanglement of formation and quantum discord
We present a direct relation, based upon a monogamic principle, between
entanglement of formation (EOF) and quantum discord (QD), showing how they are
distributed in an arbitrary tripartite pure system. By extending it to a
paradigmatic situation of a bipartite system coupled to an environment, we
demonstrate that the EOF and the QD obey a conservation relation. By means of
this relation we show that in the deterministic quantum computer with one pure
qubit the protocol has the ability to rearrange the EOF and the QD, which
implies that quantum computation can be understood on a different basis as a
coherent dynamics where quantum correlations are distributed between the qubits
of the computer. Furthermore, for a tripartite mixed state we show that the
balance between distributed EOF and QD results in a stronger version of the
strong subadditivity of entropy.Comment: Published versio
Alterações nos níveis relativos de açúcares solúveis totais e de proteínas em plantas de milho infectadas com molicutes.
As doenças do milho causadas por molicutes (fitoplasma e espiroplasma) destacam-se em importância para a cultura, em conseqüência da alta incidência e dos prejuízos que causam à produção de grãos. Os molicutes infectam o floema das plantas; sendo assim, podem alterar a síntese de açúcares e proteínas. O objetivo deste trabalho foi verificar o efeito dos molicutes na síntese de açúcares solúveis totais e de proteínas em duas cultivares de milho. O experimento foi conduzido em vasos de plástico contendo 30 kg solo previamente analisado e adubado, com duas plantas por vaso. O delineamento experimental utilizado foi um fatorial 3 x 2 inteiramente casualizado, com seis repetições; sendo três inoculações (fitoplasma, espiroplasma e sadia) e duas cultivares (Dina 766 e BR 201). Trinta dias após a inoculação, foram realizadas medidas de temperatura foliar, umidade relativa, resistência estomática e transpiração. No estádio de grão leitoso, uma das plantas foi colhida e seccionada em três partes, para análise de açúcares solúveis totais, nutrientes e matéria seca. Foi realizada uma amostragem do internódio abaixo da primeira espiga e da folha bandeira, para determinação da atividade da peroxidase e do conteúdo proteíco. A planta restante foi conduzida até o final do ciclo, quando foram avaliados: número de espigas, peso de espigas e de grãos e matéria seca dos grãos. A análise de variância de todas as características avaliadas não detectou signifi-cância na interação cultivar x inoculação. Alguns parâmetros mostraram significância para cultivares, para inoculação ou para ambos. Açúcares solúveis, matéria seca, atividade da peroxidase e conteúdo protéico foram semelhantes em ambas as cultivares e nas inoculações. A resistência estomática foi maior para Dina 766 e nas plantas inoculadas por fitoplasma. A proliferação de espigas foi maior nas plantas inoculadas pelos molicutes que nas sadias. O peso de espigas e de grãos foi maior nas plantas sadias e com fitoplasma que naquelas infectadas por espiroplasma. Concentração de nutrientes e quantidade absorvida, em geral, foram semelhantes, excetuando P e Zn. Os molicutes não interferiram na concentração dos açúcares solúveis e no conteúdo proteíco total; entretanto, os dados de produtividade sugerem uma maior susceptibilidade das cultivares ao espiroplasma
Some properties of two Nambu--Jona-Lasinio -type models with inputs from lattice QCD
We investigate the phase diagram of the so-called
Polyakov--Nambu--Jona-Lasinio (PNJL) model at finite temperature and nonzero
chemical potential. The calculations are performed in the light and strange
quark sectors (, , ), which includes the 't Hooft instanton induced
interaction term that breaks the axial symmetry, and the quarks are coupled to
the (spatially constant) temporal background gauge field. On one hand, a
special attention is payed to the critical end point (CEP). The strength of the
flavor-mixing interaction alters the CEP location, since when it becomes weaker
the CEP moves to low temperatures and can even disappear. On the other hand, we
also explore the connection between QCD, a nonlocal Nambu--Jona-Lasinio type
model and the Landau gauge gluon propagator. Possible links between the
quenched gluon propagator and low energy hadronic phenomenology are
investigated.Comment: Contribution to the International Meeting "Excited QCD", Peniche,
Portugal, 06 - 12 May 201
Erupted Complex Odontoma Mimicking a Mandibular Second Molar
Complex odontoma (CO) is considered one of the most common odontogenic lesions, composed by a miscellaneous of dental tissue such as enamel, dentin, pulp and sometimes cementum. They may interfere with the eruption of an associated tooth, being more prevalent in the posterior mandible. CO has been rarely reported as erupted, being considered an intraosseous lesion. This is a case report of a 17-year-old male with a benign fibro-osseous lesion consistent with CO that was located at the left second molar region, above the crown of the impacted mandibular second molar tooth. The lesion was surgically removed, and the tooth had to be extracted, since there was no indication that it could erupt naturally or with orthodontic traction. The histopathological examination confirmed the diagnosis of CO and after 6 months complete bone formation was observed radiographically. An early diagnosis will provide a better treatment option, avoiding tooth extraction or a more damaging surgery
Dark/Visible Parallel Universes and Big Bang Nucleosynthesis
We develop a model for visible matter-dark matter interaction based on the
exchange of a massive gray boson called herein the Mulato. Our model hinges on
the assumption that all known particles in the visible matter have their
counterparts in the dark matter. We postulate six families of particles five of
which are dark. This leads to the unavoidable postulation of six parallel
worlds, the visible one and five invisible worlds. A close study of big bang
nucleosynthesis (BBN), baryon asymmetries, cosmic microwave background (CMB)
bounds, galaxy dynamics, together with the Standard Model assumptions, help us
to set a limit on the mass and width of the new gauge boson. Modification of
the statistics underlying the kinetic energy distribution of particles during
the BBN is also discussed. The changes in reaction rates during the BBN due to
a departure from the Debye-Hueckel electron screening model is also
investigated.Comment: Invited talk at the Workshops "CompStar: the physics and astrophysics
of compact stars", Tahiti, June 4-8, 2012, "New Directions in Nuclear
Astrophysics", Castiglion Fiorentino, Italy, June 18-22, 2012, and
"Carpathian Summer School of Physics", Sinaia, Romania, June 24 - July 7,
2012. To be published in AIP Proceeding
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