12,698 research outputs found
Reptiles, Squamata, Parque Natural Municipal da Taquara, municipality of Duque de Caxias, state of Rio de Janeiro, Southeastern Brazil
Herein we report a list of the reptiles from Parque Natural Municipal da Taquara, municipality of Duque deCaxias, state of Rio de Janeiro, southeastern Brazil, an area situated in the Atlantic Rainforest Domain. The study wascarried out from September 2006 to October 2008. We recorded 31 species of Squamate reptiles: one species of thefamily Amphisbaenidae; eight species of lizards of the families Anguidae (n = 1), Gekkonidae (1), Phyllodactylidae (1),Polychrotidae (1), Scincidae (1), Teiidae (2), and Tropiduridae (1); and 22 species of snakes of the families Boidae (2),Colubridae (6), Dipsadidae (11), Elapidae (1), and Viperidae (2). Our study indicates that the PNMT is an important area forthe conservation of the Squamate reptile assemblages that inhabit lowlands of Atlantic Rainforest in Brazil
Influência no solo da salinidade do rejeito da dessalinização usado para irrigação.
Objetivando avaliar a influência no solo do rejeito da dessalinização usado para irrigação da Atriplex nummularia, foram aplicados quatro volumes de água correspondendo aos tratamentos T1=75; T2=150; T3=225 e T=300 litros por planta por semana. Foram determinadas características químicas do rejeito e coletadas amostras de solos semanais nas profundidades de 0-30; 30-60 e 60-90 cm, para avaliação da condutividade elétrica do extrato de saturação; umidade e caracterização química. Foi determinada a velocidade de infiltração de água no solo, no início e após a colheita. Os resultados indicam aumentos nos íons, refletindo na salinidade do rejeito, que atingiu valor maximo de CE=12,9 dS/m. No contexto da salinidade do solo, ocorreram incrementos nas variáveis em função do volume de água aplicado, refletindo na condutividade elétrica do extrato de saturação do solo, que antes do plantio apresentava um valor médio de CEs=0,41 dS/m e após a colheita de CEs=8,03 dS/m. Os riscos de sodicidade estão apresentados pela redução da velocidade de infiltração inicial . Com os dados de umidade do solo estimou-se a condutividade elétrica na zona do sistema radicular da planta (CEest) que atingiu um valor máximo de 36,88 dS/m
Nonclassical correlation in NMR quadrupolar systems
The existence of quantum correlation (as revealed by quantum discord), other
than entanglement and its role in quantum-information processing (QIP), is a
current subject for discussion. In particular, it has been suggested that this
nonclassical correlation may provide computational speedup for some quantum
algorithms. In this regard, bulk nuclear magnetic resonance (NMR) has been
successfully used as a test bench for many QIP implementations, although it has
also been continuously criticized for not presenting entanglement in most of
the systems used so far. In this paper, we report a theoretical and
experimental study on the dynamics of quantum and classical correlations in an
NMR quadrupolar system. We present a method for computing the correlations from
experimental NMR deviation-density matrices and show that, given the action of
the nuclear-spin environment, the relaxation produces a monotonic time decay in
the correlations. Although the experimental realizations were performed in a
specific quadrupolar system, the main results presented here can be applied to
whichever system uses a deviation-density matrix formalism.Comment: Published versio
Group Theory analysis of phonons in two-dimensional Transition Metal Dichalcogenides
Transition metal dichalcogenides (TMDCs) have emerged as a new two
dimensional materials field since the monolayer and few-layer limits show
different properties when compared to each other and to their respective bulk
materials. For example, in some cases when the bulk material is exfoliated down
to a monolayer, an indirect-to-direct band gap in the visible range is
observed. The number of layers ( even or odd) drives changes in space
group symmetry that are reflected in the optical properties. The understanding
of the space group symmetry as a function of the number of layers is therefore
important for the correct interpretation of the experimental data. Here we
present a thorough group theory study of the symmetry aspects relevant to
optical and spectroscopic analysis, for the most common polytypes of TMDCs,
i.e. , and , as a function of the number of layers. Real space
symmetries, the group of the wave vectors, the relevance of inversion symmetry,
irreducible representations of the vibrational modes, optical selection rules
and Raman tensors are discussed.Comment: 32 pages, 4 figure
Development of zein-based edible coating containing essential oil aiming extending papaya (Carica papaya L.) shelf life.
Zeins are hydrophobic proteins that can be extracted from maize grains or from corn gluten meal (CGM), which is a by-product of ethanol and starch production
The Color-Octet intrinsic charm in and decays
Color-octet mechanism for the decay B\to \eta^\prime X is proposed to explain
the large branching ratio of Br(B\to \eta^\prime X)\sim 1\times 10^{-3}
recently announced by CLEO. We argue that the inclusive \eta^\prime production
in B decays may dominantly come from the Cabbibo favored b\to (\bar c c)_8s
process where \bar c c pair is in a color-octet configuration, and followed by
the nonperturbative transition (\bar c c)_8\to \eta^\prime X. The color-octet
intrinsic charm component in the higher Fock states of \eta^\prime is crucial
and is induced by the strong coupling of \eta^\prime to gluons via QCD axial
anomaly.Comment: 9 pages, RevTex, 1 PS figur
Experimentally Witnessing the Quantumness of Correlations
The quantification of quantum correlations (other than entanglement) usually
entails laboured numerical optimization procedures also demanding quantum state
tomographic methods. Thus it is interesting to have a laboratory friendly
witness for the nature of correlations. In this Letter we report a direct
experimental implementation of such a witness in a room temperature nuclear
magnetic resonance system. In our experiment the nature of correlations is
revealed by performing only few local magnetization measurements. We also
compare the witness results with those for the symmetric quantum discord and we
obtained a fairly good agreement
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