Finite-amplitude vibration of orthotropic axisymmetric variable thickness annular plate

Call number: LD2668 .T4 1978 A94Master of Scienc

Panorama mediático en Alemania. De la desaparición de Kirch al caso Springer-ProSiebenSAT.1

En abril de 2002, el grupo alemán Kirch presentaba suspensión de pagos y declaraba la imposibilidad de seguir adelante. La trayectoria de la compañía se enmarcaba en una atrevida forma de hacer negocio, basada en sus buenas relaciones con la derecha alemana y en un acelerado ritmo de crecimiento en los últimos años. La noticia de la desaparición de Kirch tiene claves que necesitan ser estudiadas para entender el pasado y el futuro de la estructura informativa en Alemania. Por este motivo, en el presente trabajo nos centraremos en el estudio del panorama mediático una vez desaparecido el emblemático grupo, haciendo especial referencia al reparto de su imperio. En este sentido, nos interesará destacar el capítulo protagonizado por su más importante negocio, el holding ProSiebenSAT.1, donde las consideraciones políticas y regulatorias tuvieron mucho que ver para su evolución y situación actual

The Metallicity of the Intracluster Medium Over Cosmic Time: Further Evidence for Early Enrichment

We use Chandra X-ray data to measure the metallicity of the intracluster medium (ICM) in 245 massive galaxy clusters selected from X-ray and Sunyaev-Zel'dovich (SZ) effect surveys, spanning redshifts $0<z<1.2$. Metallicities were measured in three different radial ranges, spanning cluster cores through their outskirts. We explore trends in these measurements as a function of cluster redshift, temperature, and surface brightness "peakiness" (a proxy for gas cooling efficiency in cluster centers). The data at large radii (0.5--1 $r_{500}$) are consistent with a constant metallicity, while at intermediate radii (0.1-0.5 $r_{500}$) we see a late-time increase in enrichment, consistent with the expected production and mixing of metals in cluster cores. In cluster centers, there are strong trends of metallicity with temperature and peakiness, reflecting enhanced metal production in the lowest-entropy gas. Within the cool-core/sharply peaked cluster population, there is a large intrinsic scatter in central metallicity and no overall evolution, indicating significant astrophysical variations in the efficiency of enrichment. The central metallicity in clusters with flat surface brightness profiles is lower, with a smaller intrinsic scatter, but increases towards lower redshifts. Our results are consistent with other recent measurements of ICM metallicity as a function of redshift. They reinforce the picture implied by observations of uniform metal distributions in the outskirts of nearby clusters, in which most of the enrichment of the ICM takes place before cluster formation, with significant later enrichment taking place only in cluster centers, as the stellar populations of the central galaxies evolve.Comment: 13 pages. Accepted version, to appear in MNRA

Halogen Bonds in Clathrate Cages: A Real Space Perspective

We thank the Spanish MINECO, grant CTQ2015-65790-P, and theFICYT, gran

Media System in Germany. Kirch collapse and the case of Springer.Prosieben.SAT1

En abril de 2002, el grupo alemán Kirch presentaba suspensión de pagos y declaraba la imposibilidad de seguir adelante. La trayectoria de la compañía se enmarcaba en una atrevida forma de hacer negocio, basada en sus buenas relaciones con la derecha alemana y en un acelerado ritmo de crecimiento en los últimos años. La noticia de la desaparición de Kirch tiene claves que necesitan ser estudiadas para entender el pasado y el futuro de la estructura informativa en Alemania. Por este motivo, en el presente trabajo nos centraremos en el estudio del panorama mediático una vez desaparecido el emblemático grupo, haciendo especial referencia al reparto de su imperio. En este sentido, nos interesará destacar el capítulo protagonizado por su más importante negocio, el holding ProSiebenSAT.1, donde las consideraciones políticas y regulatorias tuvieron mucho que ver para su evolución y situación actual.In April 2002, Kich group was declared to be insolvent. The development of the company was based in a risky way of doing business, taking advantage of its links with CSU politicians and growing up without any control in the last few years. The bankruptcies of Kirch has to be analysed to know more about the past and future of media system in Germany. This article seeks to explore the communication sector after Kirch collapse, above all in the moment that the company is being shared out. The present text also analyse specially the sale of the most important business, ProsiebenSAT.1. Decisive policy and control considerations could explain the current situation of that holding

Accretion signatures in the X-shooter spectrum of the substellar companion to SR12

About a dozen substellar companions orbiting young stellar objects or pre-main sequence stars at several hundred au have been identified in the last decade. These objects are interesting both due to the uncertainties surrounding their formation, and because their large separation from the host star offers the potential to study the atmospheres of young giant planets and brown dwarfs. Here, we present X-shooter spectroscopy of SR 12 C, a $\sim\,2\,$Myrs young brown dwarf orbiting SR 12 at an orbital separation of 1083 au. We determine the spectral type, gravity, and effective temperature via comparison with models and observational templates of young brown dwarfs. In addition, we detect and characterize accretion using several accretion tracers. We find SR 12 C to be a brown dwarf of spectral type L0 $\pm$ 1, $\log$ g = 4 $\pm$ 0.5, an effective temperature of 2600 $\pm$ 100 K. Our spectra provide clear evidence for accretion at a rate of $\sim$ $10^{-10}$ $M_{\odot}yr^{-1}$. This makes SR 12 one of the few sub-stellar companions with a reliable estimate for its accretion rate. A comparison of the ages and accretion rates of sub-stellar companions with young isolated brown dwarfs does not reveal any significant differences. If further accretion rate measurements of a large number of substellar companions can confirm this trend, this would hint towards a similar formation mechanism for substellar companions at large separations and isolated brown dwarfs

Controlling morphology using low molar mass nucleators

This chapter focuses on the use of low molar mass compounds which self-assemble in to fibrillar structures within a polymer melt. Application of modest shear rate to the system will result in a common alignment of these fibrils which can serve as row nuclei for the subsequent crystallisation of the polymer matrix. Thus the combination of small quantities of a low molar mass compound and modest shear flow leads to a semi-crystalline morphology with a well defined anisotropy and morphology

Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window

We present a three-dimensional (3-D) interpretation of 117 long period (20–4096 s) magnetotelluric (MT) sites between 31°S and 35°S in western Argentina. They cover the most horizontal part of the Pampean shallow angle subduction of the Nazca Plate and extend south into the more steeply dipping region. Sixty-two 3-D inversions using various smoothing parameters and data misfit goals were done with a nonlinear conjugate gradient (NLCG) algorithm. A dominant feature of the mantle structure east of the horizontal slab is a conductive plume rising from near the top of the mantle transition zone at 410 km to the probable base of the lithosphere at 100 km depth. The subducted slab is known to descend to 190 km just west of the plume, but the Wadati-Benioff zone cannot be traced deeper. If the slab is extrapolated downdip it slices through the plume at 250 km depth. Removal of portions of the plume or blocking vertical current flow at 250 km depth significantly changes the predicted responses. This argues that the plume is not an artifact and that it is continuous. The simplest explanation is that there is a “wedge”-shaped slab window that has torn laterally and opens down to the east with its apex at the plume location. Stress within the slab and seismic tomography support this shape. Its northern edge likely explains why there is no deep seismicity south of 29°S.Fil: Burd, Aurora I.. University of Washington; Estados UnidosFil: Booker, John R.. University of Washington; Estados UnidosFil: Mackie, Randall. Land General Geophysics; ItaliaFil: Pomposiello, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotopica; ArgentinaFil: Favetto, Alicia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotopica; Argentin

Kajian Valuasi Ekonomi Hutan Mangrove Di Desa Pasar Banggi, Kecamatan Rembang, Kabupaten Rembang

Economi valuation is an instrument used to know a function of mangrove forest. The object of this research are to find out totalized economic valuation by means of direct valuation at mangrove area Pasar Banggi village, Rembang. Economic valuation can be able by totalized a direct use value, indirect use value, Option value and Existence value. Identification result at Pasar Banggi village are consist by four components there are, direct use values : Bandeng fishponds, saltponds, mangrove seeds, catching fishes, oyster and crab, indirect use values : breakwater as a resists of abration, option value : biodiversity, Existence value : habitats. The biggest value in this research is the resist of abration assumption as breakwater that is as bis as Rp.18.717.774.250-/year and total economic value from economis Pasar Banggi village, Rembang that is as big as Rp.19.610.846.229.-/year