ACCURATE DETERMINATION OF PARAMETERS OF INTERNAL FRICTION ASSOCIATED WITH GRAIN BOUNDARY

1985 ◽  
Vol 46 (C10) ◽  
pp. C10-379-C10-382
Author(s):  
JIANG ZI-YING ◽  
CAI WEI-PING
Keyword(s):  
Internal Friction ◽  
Grain Boundary ◽  
Accurate Determination ◽  
Determination Of Parameters

scholarly journals The crystal structure of the chondrodite series

1928 ◽  
Vol 117 (777) ◽  
pp. 517-532 ◽  
Keyword(s):  
Crystal Structure ◽  
Quantitative Study ◽  
Accurate Determination ◽  
X Ray ◽  
Guiding Principle ◽  
Quantitative Examination ◽  
Absolute Measurements ◽  
Moderate Complexity ◽  
Determination Of Parameters

The chondrodite group of minerals comprises prolectite (H 2 Mg 3 SiO 6 ), chondrodite (H 2 Mg 5 Si 2 O 10 ), humite (H 2 Mg 7 Si 3 O 14 ) and clinohumite (H 2 Mg 9 Si 4 O 18 ). We have so far been unable to obtain a specimen of the first—there seems, indeed, to be some doubt as to its existence—and, in consequence, the present paper is concerned with the last three members only. Our conclusions are based on X-ray data obtained by the rotating crystal method and by the ionisation spectrometer. None of the crystal specimens was suitable for absolute measurements of the intensity of reflexion, and the investigation has therefore been wholly qualitative in character. This, of course, increases considerably the difficulty of the problem, especially in so far as an accurate determination of parameters is concerned; for in attacking crystal structures of even moderate complexity, the advisability of a quantitative study is being more and more realised. In the present case, we are dealing with crystals possessing a very large number of parameters ( e. g ., 24 in chondrodite, 36 in humite and 45 in clinohumite), and even a detailed quantitative examination might be unsuccessful without the use of some guiding principle or principles. These principles will be apparent later.

scholarly journals WR 20a Is an Eclipsing Binary: Accurate Determination of Parameters for an Extremely Massive Wolf-Rayet System

2004 ◽  
Vol 611 (1) ◽  
pp. L33-L36 ◽  
Author(s):  
A. Z. Bonanos ◽  
K. Z. Stanek ◽  
A. Udalski ◽  
L. Wyrzykowski ◽  
K. Żebruń ◽  
...  
Keyword(s):  
Accurate Determination ◽  
Eclipsing Binary ◽  
Determination Of Parameters
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