Notice of RetractionRelationship between thickness of siliconized layer prepared by electrodeposition and components of molten salts
The siliconized layer on low silicon steel sheet was obtained by electrodeposition in KCl-NaCl-NaF-SiO2 molten salts. Proportion of molten salts was designed using symmetry-simplex method. A regression equation was found to be a better fit for the relationship between thickness of the siliconized layer and salts components. Based on the equation, the thickness isoline was plotted to reveal the influence of salts proportion on thickness. The results showed that NaF content had a significant effect on the thickness of the siliconized layer. The thickness increased gradually with the increase of NaF content. When NaF was 0.4-0.6 mole fraction, the thickness increased remarkably. Furthermore, when the concentration of KCl was kept constant, the ratio of NaF/NaCl was important to control the thickness. The thickness was relatively small as mole fraction ratio NaF/NaCl was about 2:3.
Optimum designs for optimum mixtures
In a mixture experiment, the measured response is assumed to depend only on the relative proportion of ingredients or components present in the mixture. Scheffe [1958. Experiments with mixtures. J. Roy. Statist. Soc. B 20, 344-360; 1963. Simplex--centroid design for experiments with mixtures. J. Roy. Statist. Soc. B 25, 235-263] first systematically considered this problem and introduced different models and designs suitable in such situations. Optimum designs for the estimation of parameters of different mixture models are available in the literature. However, in a mixture experiment, often one is more interested in the optimum proportion of ingredients. In this paper, we try to find optimum designs for the estimation of optimum mixture combination on the assumption that the response function is quadratic concave over the simplex region.
Degradable polymers : principles and applications
1. Why Biodegradable Polymers? G. Scott. 2. An Overview of Biodegradable Polymers and Biodegradation of Polymers S.H. Huang. 3. Degradation and Stabilization of Carbon-Chain Polymers G. Scott. 4. Techniques and Methods of Polymer Degradation S. Karlsson, A.-C. Albertsson. 5. Biodegradation of Aliphatic Polyesters Suming Li, M. Vert. 6. Starch-Polymer Composites C. Bastioli. 7. Polymers from Renewable Sources E. Chiellini, et al. 8. Sustainable Poly(Hydroxyalkanoate) (PHA) Production G. Braunegg. 9. Polyhydroxyalkanoates: Properties and Modification for High Volume Application I. Chodak. 10. Biodegradable Polymers in Medicine E Piskin. 11. Environmentally Biodegradable Water-Soluble Polymers G. Swift. 12. Plastics and the Environment J. Guillet. 13. Degradable Hydrocarbon Polymers in Waste and Litter Control G. Scott, D.M. Wiles. Subject Index.