Cationic ring-opening polymerization of 2-phenyl-1,3,6,2-trioxaphosphocane

Summary The ring-opening polymerization of 2-phenyl-1,3,-6,2-trioxaphosphocane (4), an eight-membered cyclic phosphonite, has been investigated. Cationic initiators of PhCH₂-Cl and MeOTf gave polymers, whereas anionic and radical initiators did not yield polymer. The structure of polymer was examined by IR, ¹H, ³¹P, and ³¹C NMR spectroscopy of polymers and elemental analysis as well as the alkaline hydrolysis products. The polymer consisted of two different units, i.e., the major part is the normal phosphinate structure 5 and the minor part is the isomerized unit 6 in 7% with PhCH₂Cl initiation and in 34% with MeOTf initiator. The difference in nature of propagating species from these two initiators are discussed in connection with their reactivities.On leave from the Institute of Chemistry, Academia Sinica, Beijing, China     

Stability of submerged diffusion flames in subsonic and underexpanded supersonic gas-fuel streams

Combustion, Explosion, and Shock Waves -     

Structure formation in production of yttrium-silicate materials by the sol-gel method

Materials made from yttrium silicates were synthesized by the sol-gel method. The effect of the amount of yttrium oxide, which varied from 10 to 50% (molar content), and the water:alcoholate molar ratio was investigated. Structure formation and the character of crystallization of gels in heat treatment in the 650–1300°C range were investigated. __________ Translated from Steklo i Keramika, No. 1, pp. 3–6, January, 2007.     

Reaction of cellulose xanthate with chromium compounds by UV spectroscopy

Conclusions The type of chemical bond in the chromium compounds obtained which are based on cellulose xanthate has been ascertained.It has been shown that, as a result of an oxidation-reduction reaction between the thiocarbonate groups of the cellulose xanthate and K₂Cr₂O₇ (in acid medium), a chromium xanthate is formed which has a covalent type of bond between the sulfur atoms and chromium.Translated from Khimicheskie Volokna, No. 6, pp. 29–30, November–December, 1987.     

Statistical evaluation of the effect of the mold temperature on the strength of glass containers

Using methods of mathematical statistics (cluster, dispersion, and correlation analyses), the impact strength of three types of glass containers (bottles and jars) was analyzed. Three temperature regions in which molding results in very different values of the strength of the articles are revealed. The boundaries of the molding temperature regions are critical regardless of the type of article molded and are probably only determined by the chemical composition of the glass melt. The preferred mold temperature range is 480–550°C. The results of the study are interpreted based on an analysis of the features of molding glass at different temperatures. __________ Translated from Steklo i Keramika, No. 2, pp. 3–7, February, 2007.     

硫化监控系统软件

硫化监控软件采用VB.NET编程语言，具有更强的功能。着重论述了软件的几个主要模块的功能及如何编程来实现这些功能，包括通讯模块、数据库模块、曲线图处理模块、报警监测与控制模块等。该软件已在用户中使用，具有一些新功能。     

Interface Oscillations in Boiling

Interface oscillations during boiling are studied experimentally and theoretically. The output-signal spectra of light and acoustic sensors indicate that the liquid-pressure and interface oscillations are interrelated. A model is suggested for the oscillations of a bubble growing on a heating surface, and the existence of an attractor is deduced for the first time from the solution of model equations. The data obtained enable one to determine the ranges of interface oscillation amplitude and frequency and can be used in the modeling of boiling.     

Explosive compaction of amorphous Cu−Sn powder prepared by the method of mechanical alloying

Novosibirsk. Translated from Fizika Goreniya i Vzryva, Vol. 25, No. 2, pp. 125–129, March–April, 1989.