Accurate determination of parameters for 17O in natural abundance by Fourier transform NMR

1976 ◽  
Vol 22 (3) ◽  
pp. 537-542 ◽  
Author(s):  
D Canet ◽  
C Goulon-Ginet ◽  
J.P Marchal
Keyword(s):  
Fourier Transform ◽  
Accurate Determination ◽  
Natural Abundance ◽  
Determination Of Parameters

scholarly journals i-Rheo: determining the linear viscoelastic moduli of colloidal dispersions from step-stress measurements

2020 ◽  
Vol 22 (7) ◽  
pp. 3839-3848
Author(s):  
Rodrigo Rivas-Barbosa ◽  
Manuel A. Escobedo-Sánchez ◽  
Manlio Tassieri ◽  
Marco Laurati
Keyword(s):  
Fourier Transform ◽  
Accurate Determination ◽  
Colloidal Dispersions ◽  
Stress Measurements ◽  
Viscoelastic Moduli ◽  
Linear Viscoelastic ◽  
The Fourier Transform

The Fourier transform-based method ‘i-Rheo’ allows the accurate determination of material viscoelastic moduli from step-stress measurements.

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.

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