Examine All Heatless Permanent Wave Solutions

1941 ◽  
Vol 39 (15) ◽  
pp. 228
Keyword(s):  
Wave Solutions ◽  
Permanent Wave

Titrimetric Determination of Dithiodiglycolic Acid in Cold Permanent Wave Solutions

1970 ◽  
Vol 53 (1) ◽  
pp. 78-81
Author(s):  
Milda J Bauza ◽  
J W Nelson
Keyword(s):  
Standard Deviation ◽  
Thioglycolic Acid ◽  
Iodine Solution ◽  
Commercial Products ◽  
Average Recovery ◽  
Wave Solutions ◽  
Titrimetric Determination ◽  
Permanent Wave

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.

scholarly journals Explicit solutions of Fisher's equation with three zeros

1990 ◽  
Vol 13 (3) ◽  
pp. 617-620 ◽  
Author(s):  
M. F. K. Abur-Robb
Keyword(s):  
Traveling Wave ◽  
Traveling Wave Solutions ◽  
The Other ◽  
Wave Form ◽  
Explicit Solutions ◽  
Wave Speeds ◽  
Fisher’S Equation ◽  
Wave Solutions ◽  
Fisher's Equation ◽  
Permanent Wave

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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