2,262 research outputs found
Some aspects of geological information contained in LANDSAT images
The characteristics of MSS images and methods of interpretation are analyzed from a geological point of view. The supportive role of LANDSAT data are illustrated in several examples of surface expressions of geological features, such as synclines and anticlines, spectral characteristics of lithologic units, and circular impact structures
Remote sensing as a mineral prospecting technique
Remote sensing and its application as an alternative technique to mineral resource exploration are reviewed. Emphasis is given here to the analysis of the three basic attributes of remote sensing, i.e., spatial attributes related to regional structural mapping, spectral attributes related to rock discrimination and seasonal attributes related to geobotanic anomalies mapping, all of which are employed in mineral exploration. Special emphasis is given to new developments of the Thematic Mapper of the LANDSAT-5, principally with reference to the application of the bands 1.6 and 2.2 microns to map hydrothermally altered rocks and the band of red and blue shift to geobotanical anomalies mapping
«Christus in fide adest». Cristo presente en el creyente o la teología de la deificación en Lutero
1. EL REDESCUBRIMIENTO DE LA TEOLOGÍA DE LUTERO SOBRE LA THEOSIS. a. La óptica de la escuela finesa. b. La crítica de la escuela finesa a la interpretación anterior. 2. LA TRADICIÓN DE LA THEOSIS Y LA DOCTRINA LUTERANA. a. La tradición mística alemana. b. La teología escolástica de la gracia. c. La raíz agustiniana de la «theosis ». d. La crítica de Lutero a la mística neoplatónica. 3. CHRISTUS IN FIDE ADEST. LA PRESENCIA DE CRISTO EN EL CREYENTE. a. La relación entre la «theosis» y la justificación del cristiano. b. «Fides Christo formata». c. La fe y la presencia de Cristo. d. La fe y la gracia. e. Gracia y justificación luteranas. 4. «MYSTICA» Y «THEOSIS». a. La mística de la fe que hace presente a Cristo. b. La «vis effectiva» del amor. c. La unión con Dios «extra se». d. La oscuridad del amor. 5. BALANCE DE LA THEOSIS LUTERANA
The general dielectric tensor for bi-kappa magnetized plasmas
In this paper we derive the dielectric tensor for a plasma containing
particles described by an anisotropic superthermal (bi-kappa) velocity
distribution function. The tensor components are written in terms of the
two-variables kappa plasma special functions, recently defined by Gaelzer and
Ziebell [Phys. Plasmas 23, 022110 (2016)]. We also obtain various new
mathematical properties for these functions, which are useful for the
analytical treatment, numerical implementation and evaluation of the functions
and, consequently, of the dielectric tensor. The formalism developed here and
in the previous paper provides a mathematical framework for the study of
electromagnetic waves propagating at arbitrary angles and polarizations in a
superthermal plasma.Comment: Accepted for publication in Physics of Plasma
Trajectory Analysis for Sport and Video Surveillance
In video surveillance and sports analysis applications, object trajectories offer the possibility of extracting rich information on the underlying behavior of the moving targets. To this end we introduce an extension of Point Distribution Models (PDM) to analyze the object motion in their spatial, temporal and spatiotemporal dimensions. These trajectory models represent object paths as an average trajectory and a set of deformation modes, in the spatial, temporal and spatiotemporal domains. Thus any given motion can be expressed in terms of its modes, which in turn can be ascribed to a particular behavior. The proposed analysis tool has been tested on motion data extracted from a vision system that was tracking radio-guided cars running inside a circuit. This affords an easier interpretation of results, because the shortest lap provides a reference behavior. Besides showing an actual analysis we discuss how to normalize trajectories to have a meaningful analysis
The oblique firehose instability in a bi-kappa magnetized plasma
In this work, we derive a dispersion equation that describes the excitation
of the oblique (or Alfv\'en) firehose instability in a plasma that contains
both electron and ion species modelled by bi-kappa velocity distribution
functions. The equation is obtained with the assumptions of low-frequency waves
and moderate to large values of the parallel (respective to the ambient
magnetic field) plasma beta parameter, but it is valid for any direction of
propagation and for any value of the particle gyroradius (or Larmor radius).
Considering values for the physical parameters typical to those found in the
solar wind, some solutions of the dispersion equation, corresponding to the
unstable mode, are presented. In order to implement the dispersion solver,
several new mathematical properties of the special functions occurring in a
kappa plasma are derived and included. The results presented here suggest that
the superthermal characteristic of the distribution functions leads to
reductions to both the maximum growth rate of the instability and of the
spectral range of its occurrence
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