On two conjectures concerning convex curves

We recall two basic conjectures on the developables of convex projective curves, prove one of them and disprove the other in the firdt nontrivial case of curves in RP^3. Namely, we show that i) the tangent developable surface of any convex curve in RP^3 has 'degree' 4 and ii) construct an example of 4 tangent lines to a convex curve in RP^3 such that no real line intersects all four of them.Comment: AMSTEX, 15 pages, 3 eps pictures. to appear in Int. J. Mat

Butadiene-styrene thermoplastic elastomer with special properties

Structure and rheology of thermoplastic elastomers with stiff links of styrene in polybutadiene unit are examined. Molecular and structural characteristics TPE withthe high vinyl links of polybutadiene are shown. Structure and technological properties of the thermoplastic elastomers modified in the synthesis stage are compared

Properties of thermoshrinked films based on polyvinylchloride

Dependence of thermal shrinkage of films based on polyvinylchloride (PVC) on temperature is established. The technique of determining PVC film shrinkage speed within a wide interval of temperatures is developed. The effect of the content of the plasticizer and heat treatment on the physicomechanical parameters of PVC films is shown. The influence of the duration of mixing the components of the mix on physico-mechanical parameters of PVC films is established. Linear equations of regression of temperature rise kinetics in the course of mixing the ingredients in a high-speed agitator and those of subsequent kinetics of cooling the mix at mixing are obtained

Properties of filled compositions based on emulsion pvc

Set influence of chalk on the technological and technical properties of plastisol and compounds of PVC emulsion used in the manufacture of children's toys. Studied rheology filled with chalk plastisol and compounds. We studied the stability filled with chalk plastisols. Given the elastic-strength properties filled with plasticized PVC

Communicative discourse of terminology used in gastronomical media culture

This article aims to analyze and describe the food discourse and terms of the French language, as well as to determine correlations with the French national and cultural worldview. The study also considers the current state of "gastronomical discourse" based on the French food semiotic and communicative mode

Topological classification of black Hole: Generic Maxwell set and crease set of horizon

The crease set of an event horizon or a Cauchy horizon is an important object which determines qualitative properties of the horizon. In particular, it determines the possible topologies of the spatial sections of the horizon. By Fermat's principle in geometric optics, we relate the crease set and the Maxwell set of a smooth function in the context of singularity theory. We thereby give a classification of generic topological structure of the Maxwell sets and the generic topologies of the spatial section of the horizon.Comment: 22 pages, 6 figure