8,017 research outputs found
Conservação de propágulos de cajueiro anão precoce para enxertia por borbulhia.
No presente trabalho, foram testados varios tipos de materiais com o objetivo de se determinar as condicoes mais adequadas para o acondicionamento de propagulos, fornecedores de borbulhas de cajueiro anao precoce, mantendo sua viabilidade, mesmo quando se necessitar de mais de tres dias para se proceder a enxertia.bitstream/CNPAT-2010/5352/1/Ct-020.pd
Produção de propágulos em jardim clonal de cajueiro anão precoce irrigado e adensado.
bitstream/CNPAT-2010/5596/1/Pa-025.pd
Produção de propágulos de acerola (Malphighia glabra L.) em jardim clonal irrigado e com alta densidade de plantio.
bitstream/CNPAT-2010/5597/1/Pa-026.pd
Single gap superconductivity in beta-Bi2Pd
beta-Bi2Pd compound has been proposed as another example of a multi-gap
superconductor [Y. Imai et al., J. Phys. Soc. Jap. 81, 113708 (2012)]. Here, we
report on measurements of several important physical quantities capable to show
a presence of multiple energy gaps on our superconducting single crystals of
beta-Bi2Pd with the critical temperature Tc close to 5 K. The calorimetric
study via a sensitive ac technique shows a sharp anomaly at the superconducting
transition, however only a single energy gap is detected. Also other
characteristics inferred from calorimetric measurements as the field dependence
of the Sommerfeld coefficient and the temperature and angular dependence of the
upper critical magnetic field point unequivocally to standard single s-wave gap
superconductivity. The Hall-probe magnetometry provides the same result from
the analysis of the temperature dependence of the lower critical field. A
single-gapped BCS density of states is detected by the scanning tunneling
spectroscopy measurements. Then, the bulk as well as the surface sensitive
probes evidence a standard conventional superconductivity in this system where
the topologically protected surface states have been recently detected by ARPES
[M. Sakano et al., Nature Comm. 6, 8595 (2015)] .Comment: 7 pages, 4 figures, 1 tabl
High-magnetic field lattice length changes in URu2Si2
We report high magnetic field (up to 45 T) c-axis thermal expansion and
magnetostriction experiments on URu2Si2 single crystals. The sample length
change associated with the transition to the hidden order phase becomes
increasingly discontinous as the magnetic field is raised above 25 T. The
re-entrant ordered phase III is clearly observed in both the thermal expansion
and magnetostriction above 36 T, in good agreement with previous results. The
sample length is also discontinuous at the boundaries of this phase, mainly at
the upper boundary. A change in the sign of the coefficient of
thermal-expansion is observed at the metamagnetic transition (B_M = 38 T) which
is likely related to the existence of a quantum critical end point.Comment: 5 pages, 4 figures, to be published in PR
Magnetic field induced lattice anomaly inside the superconducting state of CeCoIn: evidence of the proposed Fulde-Ferrell-Larkin-Ovchinnikov state
We report high magnetic field linear magnetostriction experiments on
CeCoIn single crystals. Two features are remarkable: (i) a sharp
discontinuity in all the crystallographic axes associated with the upper
superconducting critical field that becomes less pronounced as the
temperature increases; (ii) a distinctive second order-like feature observed
only along the c-axis in the high field (10 T ) low
temperature ( 0.35 K) region. This second order transition is
observed only when the magnetic field lies within 20 of the ab-planes and
there is no signature of it above , which raises questions regarding
its interpretation as a field induced magnetically ordered phase. Good
agreement with previous results suggests that this anomaly is related to the
transition to the Fulde-Ferrel-Larkin-Ovchinnikov superconducting state.Comment: 3 figures, 5 page
Measurement of the circular polarization in radio emission from extensive air showers confirms emission mechanisms
We report here on a novel analysis of the complete set of four Stokes
parameters that uniquely determine the linear and/or circular polarization of
the radio signal for an extensive air shower. The observed dependency of the
circular polarization on azimuth angle and distance to the shower axis is a
clear signature of the interfering contributions from two different radiation
mechanisms, a main contribution due to a geomagnetically-induced transverse
current and a secondary component due to the build-up of excess charge at the
shower front. The data, as measured at LOFAR, agree very well with a
calculation from first principles. This opens the possibility to use circular
polarization as an investigative tool in the analysis of air shower structure,
such as for the determination of atmospheric electric fields.Comment: Accepted for publication in Phys. Rev.
Efeito da rotação de culturas na atividade enzimática total do solo.
O objetivo do trabalho foi avaliar a atividade enzimática do solo, em rotações de culturas envolvendo espécies de feijão, milho, braquiária e milheto
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