Examine All Heatless Permanent Wave Solutions

1941 ◽  
Vol 39 (15) ◽  
pp. 228
1970 ◽  
Vol 53 (1) ◽  
pp. 78-81
Author(s):  
Milda J Bauza ◽  
J W Nelson

Abstract Dithiodiglycolic acid (DTDGA) is determined in cold permanent wave solutions containing thioglycolic acid (TGA) by a procedure based on reduction of DTDGA to TGA and titration with standard iodine solution. The increase in titer between the reduced and unreduced sample represents DTDGA. Five collaborators analyzed each of two commercial products and four synthetic mixtures for TGA and DTDGA content. Results of the study show an average recovery of 101% for the total acids (DTDGA + TGA). Standard deviation is 2.8% for DTDGA and 1.2% for the total acids. It is recommended that the method be adopted as official first action.


1990 ◽  
Vol 13 (3) ◽  
pp. 617-620 ◽  
Author(s):  
M. F. K. Abur-Robb

Explicit traveling wave solutions of Fisher's equation with three simple zerosut=uxx+u(1−u)(u−a),a∈(0,1), are obtained for the wave speedsC=±2(12−a)suggested by pure analytic considerations. Two types of solutions are obtained: one type is of a permanent wave form whereas the other is not.


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