Symmetry Groups
Mostrando 13-24 de 93 artigos, teses e dissertações.
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13. Lecythidaceae Poit. in the Tupé Sustainable Development Reserve, Manaus, Brazil
Lecythidaceae is the family of the Brazil nut, and comprises about 300 species belonging to 17 genera with pantropical distributions. One hundred and twenty-two species belonging to nine genera are distributed throughout Brazil, demonstrating its greatest diversity in the Amazon rainforest where Lecythidaceae is also one of the most abundant families. It is
Braz. J. Bot.. Publicado em: 2012
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14. Chewing side, bite force symmetry, and occlusal contact area of subjects with different facial vertical patterns
Craniofacial dimensions influence oral functions; however, it is not known whether they are associated with function asymmetry. The objective of this study was to evaluate chewing side preference and lateral asymmetry of occlusal contact area and bite force of individuals with different craniofacial patterns. Seventy-eight dentate subjects were divided into
Brazilian Oral Research. Publicado em: 26/08/2011
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15. Polyol-polyesther matrices containing phthalocyanine derivatives macrocilces / Derivados de ftalocianina em sistemas poliméricos poliéster-poliol
Phthalocyanines are planar macrocycles with the presence of a central metal ion, formed by bridges of nitrogen and substituent groups in the aromatic rings adjacents. A large number of (PI) electrons, molecular symmetry and the possibility to coordinate different metals in nitrogen central atoms allows the use of these compounds in optical devices, light emi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/05/2010
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16. Efeitos de campo cristalino e rattling modes em skutterudites / Crystal field and rattling mode effects in skutterudites
This thesis addresses the general problem of crystall field effects and rattling modes in skut- terudite compounds. It employs, predominantly, the electron spin resonance technique (ESR or EPR, in the classical literature) aiming to probe the local point symmetry of the electronic states associated to the rare earth ions and the inohomogenities implied by th
Publicado em: 2010
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17. Oxocarbonos, pseudo-oxocarbonos e esquaraínas
Oxocarbons ions are cyclic compounds presenting unusual electronic and vibrational properties. These molecules anions possess a high symmetry and degree of electronic delocalization, characteristics that have been discussed in several structural and spectroscopic investigations. Compounds in which one or more of the carbonyl oxygen atoms are replaced by othe
Química Nova. Publicado em: 2009
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18. Thermal and spectral properties of di-and trimethoxybenzoates of silver (I)
The complexes of silver(I) with 2,3-, 2,4-, 2,6-, 3,4-, 3,5-dimethoxy-, and 2,3,4- and 3,4,5-trimethoxybenzoic acid anions have been synthesized and characterized by elemental analysis, IR spectroscopy, thermogravimetric and X-ray studies. Their solubility in water has been also determined at 293K. All analysed complexes were found to be crystalline, anhydro
Eclética Química. Publicado em: 2009
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19. Implementação das boas práticas de governança corporativa : impactos sobre a controladoria das empresas atuantes no novo mercado da BOVESPA
Literature says that the growth of the capital market depends on the adoption of good Corporate Governance practices, bringing economic development to countries. The implementation of these best practices leads to growth of liquidity, value and volume of trading of companies shares in the market. It seems that the adoption of good Corporate Governance practi
Publicado em: 2009
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20. Isometrias e similaridades / Isometries and similarities
The objective of this work is to classify isometries and similarities on three dimensional Euclidean space. We present some historic facts about Geometry followed by a study on isometries and similarities using tools and concepts from groups. We also suggest some helpful activities to develop abilities in the investigation of symmetry groups of figures
Publicado em: 2008
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21. Análise cariotípica em espécies dos gêneros Solanum, Lycianthes e Vassobia
The Solanum genus comprises about 1.400 species of shrubs, trees and wines, found preferentially in the tropical regions. Some of these with economic interests, as the potato. In relation to the cytogenetical features, this group is interesting by the fact of the karyotypes be sufficiently conserved in chromosome number and shape, with diversity in the repet
Publicado em: 2008
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22. Caracterização postural de crianças de 7 e 8 anos / Postural characterization of children between 7 and 8 years of age
During the infancy, the posture undergoes many adjustments related to growth stages due to changes of the body proportions. The formation of the body schema, in childhood, occurs through the motor experiences and allows the tonic-postural structuring, and the postural imbalance acquired in this period can last for the entire adolescence and adult life. The p
Publicado em: 2008
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23. Parameter symmetry in ferromagnetic superconductors / Simetria do parametro de ordem em supercondutores ferromagneticos
In this dissertation, we present a study of the order-parameter symmetry in ferromagnetic superconductors. Our approach is inspired on the Landau Theory of Phase Trasition or, more precisely, on the idea that a second order phase transition is a symmetry breaking process where the ordered phase of the system is described by a subgroup of the highly symmetric
Publicado em: 2007
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24. Local and global symmetries in gauge theories / Simetrias globais e locais em teorias de calibre
This thesis deals with the geometric formulation of classical gauge theories, or Yang-Mills theories, regarded as an important class of models that must be included in any attempt to establish a general mathematical framework for classical field theory. Such a formulation must come in (at least) two variants: the hamiltonian version which has gone through a
Publicado em: 2007