3,964 research outputs found
Use of dialkyldithiocarbamato complexes of bismuth(III) for the preparation of nano- and microsized Bi2S3 particles and the X-ray crystal structures of [Bi{S2CN(CH3)(C6H13)}(3)] and [Bi{S2CN(CH3)(C6H13)}(3)(C12H8N2)]
A range of bismuth(III) dithiocarbamato complexes were prepared and characterized. The
X-ray crystal structures of the compounds [Bi{S2CN(CH3)(C6H13)}3] (1) and [Bi{S2CN(CH3)-
(C6H13)}3(C12H8N2)] (2) are reported. The preparation of Bi2S3 particulates using a wet
chemical method and involving the thermalysis of Bi(III) dialkyldithiocarbamato complexes
is described. The influence of several experimental parameters on the optical and
morphological properties of the Bi2S3 powders was investigated. Nanosized Bi2S3 colloids
were obtained having long-term stability and showing a blue shift on the optical band edge;
the presence of particles exhibiting quantum size effects is discussed. Morphological welldefined Bi2S3 particles were obtained in which the fiber-type morphology is prevalent.FCT - POCTI/1999/CTM/ 3545
Frutas e legumes cristalizados: opção para redução de perdas e ganhos extras.
bitstream/item/29395/1/2010-298.pd
Representações sociais e expressão tipográfica : criação de logótipos para empresas de calçado
O presente artigo tem como foco a relação entre
representações sociais e expressão tipográfica na construção de marcas
compostas apenas por logotipo. Seu objetivo norteador é conhecer os
processos simbólicos que ocorrem na interação do público com as marcas,
a fim de, a partir da análise de logotipos, do ponto de vista do leitor,
identificar as conotações legíveis nas características formais da tipografia
que os compõe, e então criar efetivamente uma marca para empresa de
calçados que tem como público-alvo as classes B e C.ABSTRACT: This Article focuses on the relationship between the social
representations and the typographic expression in building brands
without symbol. The guiding objective is to know the symbolic process
that occurs on the public interaction with the brands in order to create a
footwear brand whose audience -target are classes B and C. For it, logos
will be analyzed, from the point of view of the reader, to identify the
legible connotation in the formal characteristics of the typography that
compose brands.info:eu-repo/semantics/publishedVersio
Biophilic Playspace Design: Bringing Together Children and Nature in Urban Honolulu.
D.Arch. Thesis. University of Hawaiʻi at Mānoa 2017
Dynamic critical behaviour in Ising spin glasses
The critical dynamics of Ising spin glasses with Bimodal, Gaussian, and
Laplacian interaction distributions are studied numerically in dimensions 3 and
4. The data demonstrate that in both dimensions the critical dynamic exponent
, the non-equilibrium autocorrelation decay exponent
, and the critical fluctuation-dissipation ratio
all vary strongly and systematically with the form of the
interaction distribution.Comment: 8 pages, 4 figures, version to appear in Phys. Rev.
Spin and Charge Josephson effects between non-uniform superconductors with coexisting helimagnetic order
We consider the spin and charge Josephson current between two non-uniform
Fulde-Ferrel-Larkin-Ovchinnikov superconductors with helimagnetic order. We
demonstrate that the presence of the helimagnetic phase generates a spin
Josephson effect and leads to additional contributions to both single-particle
and Josephson charge current. It is shown that for such systems the AC effect
differs more radically from the DC effect than in the case of a BCS
superconductor with helimagnetic order considered earlier in the literature [M.
L. Kuli\'c and I. M. Kuli\'c, Phys. Rev. B {\bf 63}, 104503 (2001)] where a
spin Josephson current has also been found. In our system the most interesting
effect occurs in the presence of an external magnetic field and in absence of
voltage, where we show that the charge Josephson current can be tuned to zero
while the spin Josephson current is non-vanishing. This provides a well
controlled mechanism to generate a spin supercurrent in absence of charge
currents.Comment: final versio
The superconducting phase transition and gauge dependence
The gauge dependence of the renormalization group functions of the
Ginzburg-Landau model is investigated. The analysis is done by means of the
Ward-Takahashi identities. After defining the local superconducting order
parameter, it is shown that its exponent is in fact gauge independent.
This happens because in the Landau gauge is the only gauge having a
physical meaning, a property not shared by the four-dimensional model where any
gauge choice is possible. The analysis is done in both the context of the
-expansion and in the fixed dimension approach. It is pointed out the
differences that arise in both of these approaches concerning the gauge
dependence.Comment: RevTex, 3 pages, no figures; accepted for publication in PRB; this
paper is a short version of cond-mat/990527
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