Conjugate Points
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Analytical Solution for Optimal Low-Thrust Limited-Power Transfers Between Non-Coplanar Coaxial Orbits
ABSTRACT: In this paper, an analytical solution for time-fixed optimal low-thrust limited-power transfers (no rendezvous) between elliptic coaxial non-coplanar orbits in an inverse-square force field is presented. Two particular classes of maneuvers are related to such transfers: maneuvers with change in the inclination of the orbital plane and maneuvers wit
J. Aerosp. Technol. Manag.. Publicado em: 03/05/2018
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2. Geoenvironmental Evolution of Coastal Dunes and geohistory the city of Fortaleza, Ce. / Evolução Geoambiental e Geohistórica das Dunas Costeiras do Município de Fortaleza,Ce.
The coastal zone of Fortaleza City, object of our study, has an extensive coastal area, with different natural environments, now situated in a urbanized context. Among those environments, dunes have a special place. Large dunefields occurred in Fortaleza in prior times, but most are destroyed, only resisting in punctual segments of the city. In this research
Publicado em: 2009
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3. Morfologia e dinâmica das irregularidades ionosféricas de pequena escala e imageamento ionosférico por GPS / Morphology and dynamic of small-scale ionospheric irregularities and ionospheric imaging by GPS
The signals received from the Global Positioning System (GPS) satellites were used to study the behavior of three important geophysical parameters of the ionosphere: small-scale irregularities, their zonal drift velocities and the Total Electron Content (TEC). From the fluctuations (scintillations) in the amplitude of the GPS L1 signal (1575.42 MHz), detecte
Publicado em: 2008
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4. Detecção de descontinuidades e reconstrução de funções a partir de dados espectrais : filtros splines e metodos iterativos / Detection of discontinuities and reconstruction of functions from spectral data : splines filters and iterative methods
Detecting discontinuities from Fourier coefficients is a problem that arises in several areas of application. Important examples are Fourier methods in Computed Tomography, Nuclear Magnetic Resonance Inversion and Conservation Law Differential Equations. Also, the knowledge of the precise location of the discontinuity points is essential to obtain exponentia
Publicado em: 2006
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5. RIGIDEZ DE SUPERFÍCIES CUJOS FLUXOS GEODÉSICOS PRESERVAM FOLHEAÇÕES DE CO-DIMENSÃO 1 / REGIDITY OF SURFACES WHOSE GEODESIC FLOWS PRESERVE FOLIATIONS OF CODIMENSION 1
Seja S uma superfície fechada orientável, de gênero >2 e sem pontos conjugados. Seja F uma folheação no fibrado tangente unitário de S, de codimensão 1, invariante pelo fluxo geodésico e de classe C2. Então, a curvatura de S é constante <0. A demonstração é conseqüência dos dois seguintes resultados, que têm interesse por si mesmos. O primeir
Publicado em: 2004
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6. Geodesics without conjugate points and curvatures at infinity
We study the asymptotic behavior of curvature and prove that the integral of curvature along a geodesic without conjugate points is nonpositive and some generalizations of Myers theorem and Cohn-Vossen's theorem. Some applications are also given.
Anais da Academia Brasileira de Ciências. Publicado em: 2000-06
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7. Conjugate points on a limiting extremal
Theorem 1, together with the author's extensions of the Sturmian Comparison Theorems, will suffice to establish the basic Theorem 27.3, p. 211 of Global Variational Analysis: Weierstrass Integrals on a Riemannian Manifold. Mathematical Notes, Princeton University Press, Princeton, N.J., 1976. Here and in the preceding reference there is given a Weierstrass I
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8. CONJUGATE POINTS OF SECOND-ORDER LINEAR DIFFERENTIAL EQUATIONS
The paper of which the present article is itself an abstract is concerned with locating zeros of nonnull solutions of differential systems of the formcplx=fwhere r(x) and p(x) are continous and r(x) is positive for x ≥ a. When r(x) = 1 and p(x) = αx + β, necessary conditions and sufficient conditions are pro-vided that the interval (a,b] contain n zeros.
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9. Classical Statistical Mechanics of Constraints: A Theorem and Application to Polymers
A classical system of mass points subject to holonomic constraints has a kinetic energy dependent on the coordinates as well as the moments of the remaining degrees of freedom. Coordinate averages formed in the reduced space of unconstrained coordinates and their conjugate momenta then involve a metric determinant that may be difficult to evaluate. A theorem
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10. Assessment of Antibody Response Elicited by a 7-valent Pneumococcal Conjugate Vaccine in Pediatric Human Immunodeficiency Virus Infection
We investigated antibody responses against pneumococci of serotypes 6B, 14, and 23F in 56 children and adolescents with perinatal human immunodeficiency virus (HIV) infection who were vaccinated with 7-valent pneumococcal conjugate vaccine. Overall immune responses differed greatly between serotypes. Correlation coefficients between immunoglobulin G (IgG) me
American Society for Microbiology.
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11. Tubular presentations π of subsets of manifolds
In this note the Weierstrass integral J is taken as L, the Riemann integral of length. Here Mn, n > 1, is a compact, connected manifold of class C∞ with a positive definite Riemann structure. Presentations (φ, Uφ) 𝒟 ∈ Mn and geodesics (with the aid of the Euler-Riemann equations) are defined in Morse, M. (1976) “Global variational analysis: Weiers
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12. Relationship between Serum Bactericidal Activity and Serogroup-Specific Immunoglobulin G Concentration for Adults, Toddlers, and Infants Immunized with Neisseria meningitidis Serogroup C Vaccines
A new meningococcal group C-CRM197 conjugate vaccine (MnCC; Meningitec) has been evaluated in multiple clinical trials in the United States and most recently has been approved for routine administration in the United Kingdom. Meningococcal serogroup C (MnC)-specific immunoglobulin G (IgG) antibodies in pre- and postimmunization sera obtained from healthy U.S
American Society for Microbiology.