Ellipses
Mostrando 1-10 de 10 artigos, teses e dissertações.
-
1. Quimiometria III - Revisitando a análise exploratória dos dados multivariados
In this work, three methods for pattern recognition, used as exploratory data analysis, are revisited. A brief review of principal component analysis, PCA, an unsupervised method, is provided. Next, the Mahalanobis distance and the confidence ellipses usually drawn around the scores samples are discussed. Fisher’s canonical variate analysis (a supervised m
Química Nova. Publicado em: 2022
-
2. Métodos estocásticos de otimização global para empacotar círculos em elipses / Stochastic global optimization strategies for packing circles within ellipses
Neste trabalho, consideramos uma nova parametrização para o problema de empacotar a maior quantidade possível de círculos idênticos uma região elíptica dada. Apresentamos algoritmos com propriedades de convergência global e algumas estratégias heurísticas. Ilustramos com experimentos numéricos extensivos cada uma das estratégias utilizadas
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/05/2012
-
3. Fotometria, decomposição e correlações para galáxias espirais próximas do projeto GHASP / Photometry, decomposition and correlations for nearby spiral galaxies from the GHASP survey
The spiral galaxies still challenge the theories that try to explain how the universe has turned into what we see today. In particular, in the context of the hierarchical structure formation, it is difficult to understand how galaxies can be so similar, obeying such strict scaling relations, in spite of their distinct evolutionary histories. In order to clar
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/10/2011
-
4. The traceability of animal meals in layer diets as detected by stable carbon and nitrogen isotope analyses of eggs
The aim of this study was to trace the inclusion of animal meals in layer diets by analyzing eggs and their fractions (yolk and albumen) using the technique of carbon and nitrogen isotopes. Two-hundred and eighty-eight (288) 73-week-old Shaver White layers, never fed animal ingredients, were randomly distributed in six treatments with six replicates each. Th
Revista Brasileira de Ciência Avícola. Publicado em: 2008-09
-
5. A dimensão do silêncio no cinema de Valerio Zurlini / A dimensão do silêncio no cinema de Valerio Zurlini
This is an analysis of what we understand to be the main issue in Valerio Zurlinis cinema, the measure of silence, and how this is pontuacted in the form of pauses, ellipses and silences among the images. Trought the esthetic filter that the director himself provide to us two of his works come forward: Cronaca Familiare (1962) and La Prima Notte di Quiete (1
Publicado em: 2008
-
6. Aplicação da calorimetria diferencial da varredura modulada no estudo de blendas polimericas
Temperature modulation was implemented in the differential scanning calorimetry (DSC) in the 1990 s, allowing separation of thermodynamic and kinetic phenomena. In this case, a mathematical treatment of data is necessary. The purpose of this work is to evaluate the application of modulated DSC on the study of polymeric blends made of poli(vinyl alcohol) and
Publicado em: 2001
-
7. Further observations on luminal deformity and stenosis of nonrespiratory bronchioles in pulmonary emphysema.
In an endeavour to elucidate the anatomical basis for the increased resistance to airflow which characterises the most peripheral conducting air passages in pulmonary emphysema, lumina of nonrespiratory bronchioles of lungs with mainly centrilobular disease were assessed for two- and three-dimensional features by: (1) determination of percentage conformity o
-
8. The dynamics of structural deformations of immobilized single light-harvesting complexes
Single assemblies of the intact light-harvesting complex LH2 from Rhodopseudomonas acidophila were bound to mica surfaces at 300 K and examined by observing their fluorescence after polarized light excitation. The complexes are generally not cylindrically symmetric. They act like elliptic absorbers, indicating that the high symmetry found in crystals of LH2
The National Academy of Sciences.
-
9. Factors influencing cell shape in the mutans group of streptococci.
Electron and light microscopic and growth studies of representatives of the diverse species of mutans streptococci revealed the cells to be either bacillary or coccoid in shape. Some strains changed from bacillary to coccoid if the HCO3-/K+ ratio of the media was increased and from coccoid to bacillary if the ratio was decreased. Doubling times of rods and c
-
10. Quantitative antimicrobial susceptibility testing of Haemophilus influenzae and Streptococcus pneumoniae by using the E-test.
The E-test (PDM Epsilometer; AB Biodisk, Solna, Sweden) is an antimicrobial agent gradient-coated plastic test strip which allows MIC determinations on agar media. The test is performed in a manner similar to the agar disk diffusion procedure. A collection of Haemophilus influenzae and Streptococcus pneumoniae strains possessing various resistance mechanisms