Crystallographic calculations on the silliac electronic digital computer. I. Fourier syntheses

1957 ◽  
Vol 10 (2) ◽  
pp. 95
Author(s):  
HC Freeman
Keyword(s):  
Electron Density ◽  
Digital Computer ◽  
High Speed ◽  
Electronic Digital Computer

A method is presented whereby SILLIAC, a high-speed electronic digital computer, sums 2-dimensional Fourier syntheses for crystallographic electron-density projections of any symmetry. The trigonometrical form of a particular summation and the area over which the projection is to be calculated are determined by programme-parameters introduced with the data.

Crystallographic calculations on the silliac electronic digital computer. II. Structure factors

1958 ◽  
Vol 11 (2) ◽  
pp. 99
Author(s):  
HC Freeman
Keyword(s):  
Crystal Structure ◽  
Special Reference ◽  
Structure Factor ◽  
Digital Computer ◽  
High Speed ◽  
Storage Capacity ◽  
Electronic Digital Computer ◽  
Structure Factors

Two programmes for crystal structure-factor calculations on the SILLIAC computer are briefly described, with special reference to the problem of coding such computations efficiently for a computer of high speed but limited storage capacity.

The Wall Effect in Cavity Flow

1966 ◽  
Vol 88 (1) ◽  
pp. 132-136 ◽  
Author(s):  
D. K. Ai
Keyword(s):  
Flow Field ◽  
Flat Plate ◽  
Integral Equations ◽  
Nonlinear Theory ◽  
Digital Computer ◽  
High Speed ◽  
Cavity Flow ◽  
Channel Width ◽  
Wall Effect ◽  
Plate Location

A nonlinear theory for the calculation of the flow field of an oblique flat plate under blockage condition is given using the techniques of integral equations. Numerical results are obtained with the aid of a high-speed digital computer for the plate situated midchannel at values of the angle of attack from 10 to 90 deg and the channel width-chord ratio from 3 to 20. Although the theory is developed for arbitrary plate location, the midchannel case is of great interest due to the fact that most of the tests are performed at this position.

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