The gaseous component of the disk around Beta Pictoris

1985 ◽  
Vol 293 ◽  
pp. L29 ◽  
Author(s):  
L. M. Hobbs ◽  
A. Vidal-Madjar ◽  
R. Ferlet ◽  
C. E. Albert ◽  
C. Gry
Keyword(s):  
Gaseous Component ◽  
Beta Pictoris

Theoretical analysis of counter-current absorption of a poorly soluble gas based on the PDE-AD model

1986 ◽  
Vol 51 (6) ◽  
pp. 1222-1239 ◽  
Author(s):  
Pavel Moravec ◽  
Vladimír Staněk
Keyword(s):  
Experimental Data ◽  
Liquid Phase ◽  
Gas Phase ◽  
Transfer Functions ◽  
Packed Bed ◽  
Packed Bed Column ◽  
Interfacial Transport ◽  
Gaseous Component ◽  
Poorly Soluble ◽  
Counter Current

Expression have been derived in the paper for all four possible transfer functions between the inlet and the outlet gas and liquid steams under the counter-current absorption of a poorly soluble gas in a packed bed column. The transfer functions have been derived for the axially dispersed model with stagnant zone in the liquid phase and the axially dispersed model for the gas phase with interfacial transport of a gaseous component (PDE - AD). calculations with practical values of parameters suggest that only two of these transfer functions are applicable for experimental data evaluation.

scholarly journals Environmental Effects in Galaxy Clusters: Infalling Groups in Abell 85 and 1367

2010 ◽  
Vol 6 (S277) ◽  
pp. 296-299
Author(s):  
H. Bravo-Alfaro ◽  
T. C. Scott ◽  
E. Brinks ◽  
L. Cortese ◽  
P. Granados ◽  
...  
Keyword(s):  
Galaxy Clusters ◽  
Environmental Effects ◽  
Compact Groups ◽  
Late Type ◽  
Gravitational Effects ◽  
Groups Of Galaxies ◽  
Preliminary Results ◽  
Nir Imaging ◽  
Gaseous Component ◽  
Global Cluster

AbstractWe are carrying out a multifrequency survey of late type galaxies in nearby clusters with the aim to investigate the effects exerted by both the very local and the global cluster environments. We report new VLA-HI images of galaxies in Abell 1367 and study the evolution of their gaseous component. In Abell 85 we perform a deep NIR imaging survey of the brightest spirals projected up to 1.0 Abell radius with the aim of unveiling possible gravitational effects on their stellar disks. Here we show preliminary results of these projects, mainly focused on infalling compact groups of galaxies moving towards their respective cluster centers.

A Circumstellar Disk Around beta Pictoris

Science ◽  
1984 ◽  
Vol 226 (4681) ◽  
pp. 1421-1424 ◽  
Author(s):  
B. A. SMITH ◽  
R. J. TERRILE
Keyword(s):  
Circumstellar Disk ◽  
Beta Pictoris

scholarly journals L-band search for substellar companions in the Tucana and $\beta$ Pictoris moving groups

2005 ◽  
Vol 1 (C200) ◽  
pp. 175-180
Author(s):  
M. Kasper ◽  
D. Apai ◽  
W. Brandner ◽  
L.M. Close ◽  
K. Geißler
Keyword(s):  
Beta Pictoris ◽  
L Band ◽  
Substellar Companions ◽  
Moving Groups

scholarly journals Gas and dust in the beta Pictoris moving group as seen by theHerschelSpace Observatory

2014 ◽  
Vol 565 ◽  
pp. A68 ◽  
Author(s):  
P. Riviere-Marichalar ◽  
D. Barrado ◽  
B. Montesinos ◽  
G. Duchêne ◽  
H. Bouy ◽  
...  
Keyword(s):  
Beta Pictoris

scholarly journals A study of the influence produced by the dynamics of the working bodies of cotton-processing machines on the cotton fibre quality

2021 ◽  
Vol 1 (1 (109)) ◽  
pp. 68-76
Author(s):  
Fazil Veliev
Keyword(s):  
Porous Medium ◽  
Speed Of Sound ◽  
Raw Materials ◽  
Dynamic Compression ◽  
Dynamic Change ◽  
Static Compression ◽  
Gaseous Component ◽  
Multicomponent Media ◽  
Two Component ◽  
Working Bodies

Cotton mass is considered as a compressible porous two-component medium, consisting of a mixture of cotton fibres and air included in the porous medium, which is essential in dynamic treatment processes and requires consideration when planning technological modes. It was found that the speed of sound in multicomponent media significantly decreases with an increase in the content of the gaseous component. With a certain content of components, it can become less than in each of the components separately. This is due to the fact that with an increase in the content of the gaseous component, the density of the medium increases insignificantly, and the compressibility of air sharply decreases in the pores. As a result of the research, it was found that the value of the dynamic change in the density of cotton raw materials can significantly exceed its density during static compression. This kind of influence can have both adverse and desirable effects on the primary stage of cotton processing. The dynamic characteristics of raw cotton as an object of mechanical technology were studied. The values of the speed of sound as a function of the density of cotton raw materials were determined on the basis of the theory of a two-component porous medium. The types of the dynamic compression curve of raw cotton have been established. Experimental studies on the compressibility of raw cotton are generalized. From the analysis of the cleaning processing of fibres and seeds on cleaning machines, it follows that when assigning a technological processing mode, it is necessary to comply it with the value of the sound speed for a given density of raw materials. It is necessary to avoid such rates of penetration of the working bodies into raw materials that are commensurate with the speed of sound at a given raw material density. This local dramatic increase in cotton media characteristics is a significant cause of fibre damage

Rheology of Molten Polymers with Solubilized Gaseous Component

2007 ◽  
Author(s):  
Chang Dae Han
Keyword(s):  
Bubble Dynamics ◽  
High Pressures ◽  
Polymer Solutions ◽  
Polymer Melts ◽  
Gas Bubbles ◽  
Structural Foam ◽  
Molten Polymer ◽  
Gaseous Component ◽  
Molten Polymers ◽  
Thermoplastic Foam

Polymer melts (or polymer solutions) with a solubilized gaseous component (which occur under sufficiently high pressures, thus forming homogeneous mixtures), and polymer melts (or polymer solutions) with dispersed gas bubbles (thus forming heterogeneous mixtures of polymeric fluid and gas bubbles) are encountered in thermoplastic foam processing and polymer devolatilization. Thus, a good understanding of the rheological behavior of such mixtures is very important to the design of processing equipment and successful optimization of such polymer processing operations. From the 1950s through the 1970s, the dynamics of a single, spherical gas bubble dispersed in a stationary Newtonian or viscoelastic medium was extensively reported in the literature (Barlow and Langlois 1962; Duda and Vrentas 1969; Epstein and Plesset 1950; Folger and Goddard 1970; Marique and Houghton 1962; Plessst and Zwick 1952; Rosner and Epstein 1972; Ruckenstein and Davis 1970; Scriven 1959; Street 1968; Street et al. 1971; Tanasawa and Yang 1970; Ting 1975; Yang and Yeh 1966; Yoo and Han 1982; Zana and Leal 1975). While such investigations are of fundamental importance in their own right, they are not much help to describe bubble dynamics in thermoplastic foam extrusion or structural foam injection molding, for instance. There is no question that an investigation of bubble dynamics in a flowing molten polymer with dispersed gas bubbles is a very difficult subject by any measure. Thus, understandably, a relatively small number of research publications on bubble dynamics in a flowing molten polymer have been reported (Han and Villamizar 1978; Han et al. 1976; Yoo and Han 1981). The complexity of the problem arises from other related issues, such as the solubility and diffusivity of gaseous component(s) in a flowing molten polymer, which in turn depend on temperature and pressure of the system. Further, a gaseous component solubilized in molten polymer in the upstream side of a die, for instance, may nucleate as the pressure of the fluid stream decreases along the die axis, after which they could grow continuously as the molten polymer with dispersed gas bubbles flows through the rest of the die.

scholarly journals Non-circular motions in the galaxy as exhibited by very young stars

1964 ◽  
Vol 20 ◽  
pp. 92-99
Author(s):  
H. F. Weaver
Keyword(s):  
Large Scale ◽  
Spiral Structure ◽  
Young Stars ◽  
Significant Fraction ◽  
Fundamental Importance ◽  
General Character ◽  
Gaseous Component ◽  
The Galaxy ◽  
Scale Expansion

I. Expansion of the Gaseous and Stellar Components of the GalaxyIf the gaseous component of the Galaxy is expanding as observed by Rougoor and Oort in the centre of the Galaxy and as postulated by Kerr in his early interpretation of spiral structure, the expansion must represent a phenomenon of fundamental importance in the Galaxy which has, in all probability, been operative for a significant fraction of the age of the Galaxy. Presumably, very young stars formed from this gas and having ages less than 1 % of the age of the Galaxy might be expected to retain in their motions the general character of the large-scale expansion of the gas from which they originated.

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