Browsing by Issue Date Facultad de Ciencias Físicas y Matemáticas
Now showing items 121-140 of 20579
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(1998-08)A two-dimensional (2-D) model for a heap or dump bioleaching of a copper ore containing mainly chalcocite and pyrite has been developed. The rate of the mineral sulfide dissolution was related to the rate of oxidation ...
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(1998-08)Optical positions relative to the Hipparcos Catalogue, and therefore within the International Celestial Reference System (ICRS), have been obtained for the optical counterparts of 25 compact extragalactic radio sources ...
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(The American Astronomical Society, 1998-08-10)We present Very Large Array (VLA) continuum (2, 3.6, and 20 cm) and line (H I 21 cm, C92a, and H92a) observations toward the obscured cometary-like H II region located near the optical nebulosities GGD 12È15. We Ðnd that ...
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(UNIV CHICAGO PRESS, 1998-12-01)
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(1999)In this paper we study a simplified model of the behavior of a 3-D solid made from two elastic homogeneous materials separated by a rapidly oscillating interface. We study the asymptotic beha¨ior of the solution of such ...
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(Universidad de Chile, 1999)El objetivo de esta tesis es contribuir a la comprensión de los viajes en el contexto de las actividades que los motivan, a través de la interpretación microeconómica del Valor subjetivo del tiempo de viaje (VSTV). Como ...
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Fourier homogenization method and the propagation of acoustic waves through a periodic vortex array (1999)The classical problem of homogenization of elliptic operators in arbitrary domains with periodically oscillating coe cients is considered. As the period goes to zero, an asymptotic analysis of the corresponding sequence ...
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(1999)Proper motions, positions, nding charts and magnitudes are given for 293 newly discovered stars with proper motions larger than 0.15 arcsec/year. They are located between −5 and −30 in declination, and 13h 30m and ...
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(1999)We introduce a concept of weak solution for a boundary value problem modelling the motion of a rigid body immersedin a viscous fluid. The time variation of the fluid’s domain (due to the motion of the rigid body) is not ...
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(1999)We present VLA observations of the J; K 1; 1 , (2, 2), (3, 3) and (4, 4) inversion transitions of NH3 toward the HW 2 object in Cepheus A, with 1-arcsec angular resolution. Emission is detected in the main hyperfine ...
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(1999)We consider a Brownian motion in a Benedicks domain with absorption at the boundary. We show ratio limit theorems for the associated heat kernel. When the hole is compact, therefore the Martin boundary is two dimensional; ...
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(Universidad de Chile, 1999)
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(UNIV CHICAGO PRESS, 1999-01-01)We have obtained new Tully-Fisher (TF) peculiar velocity measurements for 52 Abell galaxy clusters distributed throughout the sky between similar to 50 and 200 h(-1) Mpc. The measurements are based on 1-band photometry and ...
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(1999-03)We present the UBV (RI) light curves of the Type Ia supernova SN 1998bu, which appeared in the nearby galaxy M96 (NGC K3C368). M96 is a spiral galaxy in the Leo I group that has a Cepheid-based distance. Our photometry ...
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(UNIV CHICAGO PRESS, 1999-03-01)We apply a simple statistical method to estimating the completeness of quasar surveys. It requires that an area has been covered by two or more, preferably different, selection techniques. We use three suitable data sets ...
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(1999-03-20)j\3.4 mm toward the Cepheus A East star-forming region. The HCO` line shows emission up to velocities of D50 km s~1 relative to the ambient cloud velocity. The spatial distribution of the highvelocity gas is bipolar, ...
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(The Astronomical Society of the Pacific, 1999-05)Observations of a group of S-type symbiotic stars are presented : Hen 828, Hen 905, Hen 1103, Hen 1213, KX TrA (Cn 1-2), AE Ara (PC 18), AS 255, AS 270, AS 289, Y CrA, AS 304, AS 316, AS 327, and CD [43¡14304. The ...
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(1999-09)Cloud environment is thought to play a critical role in determining the mechanism of formation of massive stars. In this contribution we review the physical characteristics of the environment around recently formed massive ...
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(1999-10)We report the discovery and ground-based observations of the new gravitational lens CTQ 414. The source quasar lies at a redshift of z\1.29 with a B magnitude of 17.6. Ground-based optical imaging reveals two point sources ...