Quaternion
Mostrando 13-19 de 19 artigos, teses e dissertações.
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13. Trajetórias de lançamento de um veículo multicorpo, configuração "strap-on", e simulação bidimensional
Este trabalho refere-se às considerações gerais sobre o cálculo numérico de trajetórias bidimensionais de um veículo lançador de satélites, multicorpo, em que quatro propulsores auxiliares (boosters), constituintes do primeiro estágio, são enfeixados em torno de um corpo central, o segundo estágio, cuja configuração é denominada "STRAP-ON
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/10/1988
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14. Respiratory motion correction in gated cardiac SPECT using quaternion-based, rigid-body registration
In this article, a new method is introduced for estimating the motion of the heart due to respiration in gated cardiac SPECT using a rigid-body model with rotation parametrized by a unit quaternion. The method is based on minimizing the sum of squared errors between the reference and the deformed frames resulting from the usual optical flow constraint by usi
American Association of Physicists in Medicine.
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15. CLASS NUMBER OF A DEFINITE QUATERNION WITH PRIM DISCRIMINANT*
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16. ON FINITE GROUPS OF EVEN ORDER WHOSE 2-SYLOW GROUP IS A QUATERNION GROUP
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17. Visualization and analysis of unfolded nucleosomes associated with transcribing chromatin.
We have characterized the structure of transcriptionally active nucleosome subunits using electron spectroscopic imaging. Individual nucleosomes were analyzed in terms of total mass, DNA and protein content, while the ensemble of images of active nucleosomes was used to calculate a three-dimensional reconstruction. Transcriptionally active nucleosomes were s
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18. Parametrizations of elliptic curves by Shimura curves and by classical modular curves
Fix an isogeny class 𝒜 of semistable elliptic curves over Q. The elements of 𝒜 have a common conductor N, which is a square-free positive integer. Let D be a divisor of N which is the product of an even number of primes—i.e., the discriminant of an indefinite quaternion algebra over Q. To D we associate a certain Shimura curve X0D(N/D), whose
The National Academy of Sciences of the USA.
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19. SuperPose: a simple server for sophisticated structural superposition
The SuperPose web server rapidly and robustly calculates both pairwise and multiple protein structure superpositions using a modified quaternion eigenvalue approach. SuperPose generates sequence alignments, structure alignments, PDB (Protein Data Bank) coordinates and RMSD statistics, as well as difference distance plots and images (both static and interacti
Oxford University Press.