Energetics
Mostrando 1-12 de 308 artigos, teses e dissertações.
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1. A Theoretical investigation of a potential high energy density compound 3,6,7,8-tetranitro-3,6,7,8-tetraaza-tricyclo[3.1.1.1(2,4)]octane
The B3LYP/6-31G (d) density functional theory (DFT) method was used to study molecular geometry, electronic structure, infrared spectrum (IR) and thermodynamic properties. Heat of formation (HOF) and calculated density were estimated to evaluate detonation properties using Kamlet-Jacobs equations. Thermal stability of 3,6,7,8-tetranitro-3,6,7,8-tetraaza-tric
Quím. Nova. Publicado em: 2013
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2. Integrated experimental biophysics and molecular dynamics simulations of biomolecules in solution - the interaction of nuclear receptors with DNA response elements and the inter-domain dynamics of Cellobiohydrolase I / Estudos por modelagem e dinâmica molecular integradas a técnicas físicas para biomoléculas em solução - interação de receptores nucleares a elementos responsivos no DNA e dinâmica inter-domínios da celobiohidrolase I
Collective motions play a fundamental role in solution biomolecule dynamics and energetics. These movements can couple very distant regions in the protein structures affection, for instance, allosteric mechanisms, the establishment of macromolecular complexes, and on the integrated function of multidomain proteins as molecullar machines. In this thesis, we p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/09/2011
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3. Efeitos da velocidade nos paramêtros mecânicos e energéticos da locomoção de amputados transfemurais / Effects of speed on mechanics and energetics of transfemoral amputee walking
A caminhada humana é um movimento importante utilizado pelo homem, porém extremamente complexo em relação aos mecanismos energéticos e mecânicos que geram este movimento. O custo energético é maior na caminhada de amputados quando comparada a caminhada de indivíduos sem restrições físicas. Variáveis mecânicas e energéticas de amputados não fo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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4. Estudo das estruturas de discordâncias cristalinas em arseneto de gálio
We employ ab initio calculations to investigate 90º partial dislocations in gallium arsenide. In a binary semiconductor like GaAs, two types of dislocations are present. In the a(ß) dislocation, there are two lines of arsenic (gallium) atoms on each side, bordering the geometric center of the dislocation core. For both the a ß and dislocations, we conside
Publicado em: 2009
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5. Soluções tipo-vórtice de spins na fita de Möbius / Spin vortex-like solutions on a Möbius Strip
We consider the classical version of the Heisenberg exchange model on the surface of a Möbius strip. Vortex- like excitations, carrying non-trivial charge (topological winding number), are shown to emerge as static solutions in the planar rotator regime. Besides such a charge, attention is also paid to discuss about its energetics.
Publicado em: 2009
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6. Desenvolvimento de metodos opticos para o estudo do acoplamento neuro-vascular-metabolico intrinseco a dinamica cerebral / Development of optical methods to the study of neuro-metabolic-vascular coupling underlying cerebral dynamics
Task-associated neuronal activity leads to a complex chain of biological events within the brain. The increased energetics gives rise to elevated glucose and oxygen consumption in the tissue. Biochemical and neuronal factors induce changes in blood vessels and variations in blood ow, volume and oxygenation. Although it has been extensively investigated, this
Publicado em: 2009
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7. Incursões de ar frio sobre a região sudeste da América do Sul / Cold-air outbreaks over southeast of South America
Neste trabalho foram estudadas as características físicas e dinâmicas das incursões de ar frio durante os meses mais frios (maio, junho, julho, agosto e setembro) da região sul do Brasil. No estudo da tendência da temperatura mínima das estações de superfície que apresentam mais de 30 anos de dados, encontrou-se uma variabilidade interdecadal, por�
Publicado em: 2009
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8. Cold-air outbreaks over southeast of South America / Incursões de ar frio sobre a região sudeste da América do Sul
Neste trabalho foram estudadas as características físicas e dinâmicas das incursões de ar frio durante os meses mais frios (maio, junho, julho, agosto e setembro) da região sul do Brasil. No estudo da tendência da temperatura mínima das estações de superfície que apresentam mais de 30 anos de dados, encontrou-se uma variabilidade interdecadal, por�
Publicado em: 2009
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9. Termorregulação colonial e energética individual em abelhas sem ferrão Melipona quadrifasciata Lepeletier (Hymenoptera, Apidae, Meliponini) / Colonial thermoregulation and energetics in stingless bees Melipona quadrifasciata Lepeletier (Hymenoptera, Apidae, Meliponini).
In eusocial insects, such as stingless bees, the control of nest conditions and maintenance of the colonial microclimate are important to brood incubation, development of eggs, larvae and pupae, and survival of the colony. One of the main thermoregulatory mechanisms to control nest temperature is the microhabitat selection to build the nest, such as tree hol
Publicado em: 2008
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10. Defeitos em nanofitas de Grafeno zigzag / Defects in zigzag graphene nanofibres
Graphene and graphene nanoribbons have been attracting a lot of interest from the scientific community because of their novel properties. In this work, a systematic research has been done on the stability and energetics of divacancy, vacancy and Stone-Wales defects in graphene and zigzag graphene nanoribbons. With this goal in mind, ab initio density functio
Publicado em: 2008
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11. The Brazilian solar heater : theory and practice in favor of a sustainable transfer of technology / O aquecedor solar brasileiro : teoria e pratica em prol de uma transferencia de tecnologia sustentavel
This research represents a contribution to the hydric resources, energetics and environmental, serving as a technical aid to the energetical planning per the demand side, acting favorably on the stability of the conventional electrical systems. It has been studied a reduction on the manufacturing cost of an industrialized solar heater that performs well duri
Publicado em: 2008
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12. Nanoparticulas metalicas anisotropicas : mecanismos de formação e aplicações opticas / Anisotropic metal nanoparticles : formation mechanisms and optical applications
Noble metal nanoparticles have attracted a recent renewed interest due to the new scientific and technological applications exploiting their unique optical properties. At nanometric scale, it is well known that the optical response of metals, related to the excitation of surface plasmons, strongly depends not only on the size of the particles but also on the
Publicado em: 2008