Mathematical and Physical Properties of an Extended Thermodynamics Multi-temperature Model for the Description of Gas Mixtures

2012 ◽  
Author(s):  
Elvira Barbera ◽  
Francesca Brini
Keyword(s):  
Physical Properties ◽  
Gas Mixtures ◽  
Extended Thermodynamics ◽  
Temperature Model

Investigation of Slider Vibrations and Vibration Mode Changes in Helium-Air Gas Mixtures

2014 ◽  
Author(s):  
Zhengqiang Tang ◽  
Frank E. Talke
Keyword(s):  
Numerical Model ◽  
Physical Properties ◽  
Free Path ◽  
Frequency Analysis ◽  
Vibration Mode ◽  
Mean Free Path ◽  
Gas Mixtures ◽  
Gas Mixture ◽  
Air Bearing ◽  
Pitch Mode

A numerical model for the simulation of slider vibrations in helium-air gas mixtures has been developed. The physical properties of the helium-air gas mixture, such as density, mean free path and viscosity, were determined to calculate the dynamic flying characteristics of a slider using the CMRR air bearing simulator. Frequency analysis shows that the helium percentage in the gas mixture can shift the second pitch mode of the slider to a higher frequency.

Heat transfer in multi-component gas mixtures described by extended thermodynamics

Meccanica ◽  
2011 ◽  
Vol 47 (3) ◽  
pp. 655-666 ◽  
Author(s):  
Elvira Barbera ◽  
Francesca Brini
Keyword(s):  
Heat Transfer ◽  
Gas Mixtures ◽  
Extended Thermodynamics

The Photometric Properties of the Ap Stars

1976 ◽  
Vol 32 ◽  
pp. 365-377 ◽  
Author(s):  
B. Hauck
Keyword(s):  
Physical Properties ◽  
Ap Stars

The Ap stars are numerous - the photometric systems tool It would be very tedious to review in detail all that which is in the literature concerning the photometry of the Ap stars. In my opinion it is necessary to examine the problem of the photometric properties of the Ap stars by considering first of all the possibility of deriving some physical properties for the Ap stars, or of detecting new ones. My talk today is prepared in this spirit. The classification by means of photoelectric photometric systems is at the present time very well established for many systems, such as UBV, uvbyβ, Vilnius, Geneva and DDO systems. Details and methods of classification can be found in Golay (1974) or in the proceedings of the Albany Colloquium edited by Philip and Hayes (1975).

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