Solid Solutions in the LnAlO3–CaTiO3 (Ln = Dy, Y, Lu) Systems

The phase equilibria in the LnAlO₃–CaTiO₃ (Ln = Dy, Y, Lu) systems are investigated and their phase diagrams are constructed for the first time. The thermal stability of the prepared solid solutions with a perovskite structure is studied.     

Elastic, anelastic, and piezoelectric coefficients of langasite: resonance ultrasound spectroscopy with laser-Doppler interferometry

This paper presents advanced techniques to determine all independent elastic-stiffness coefficients C/sub ij/, the associated internal friction Q/sub ij//sup -1/, and piezoelectric coefficients e/sub ij/ of monocrystal langasite (La/sub 3/Ga/sub 5/SiO/sub 14/) using a single rectangular parallelepiped specimen. Langasite's crystal structure belongs to the trigonal system with point group 32, and thus possesses six independent C/sub ij/, two e/sub ij/, and two dielectric coefficients /spl epsiv//sub ij/. All of the elastic and piezoelectric coefficients affect the mechanical resonance frequencies of the solid specimen, and measuring them very accurately permits one to determine the C/sub ij/ and e/sub ij/ with known density, dimensions, and e/sub ij/. We developed a piezoelectric tripod to support the specimen upward and measured the free-vibration resonance frequencies with minimum load from its own weight. This weak and stable acoustic coupling ensures accuracy of the frequency measurement better than 10/sup -5/, enough to determine the coefficients reliably. Our C/sub ij/ fall in the range of results measured with previous (conventional) methods. Our e/sub 11/ is smaller than the reported values by 1.2-13%, and e/sub 14/ is larger by 44-97%. For the internal friction measurement, we used a solenoid coil to vibrate the specimen without any contact. The longitudinal-wave internal friction considerably exceeds the shear-wave internal friction, which can be explained by phonon-phonon interactions.     

Dual-purpose technologies in view of diversification of the military-industrial complex of Russia

Current problems in scientific-information support of the process of diversification of the military-industrial complex (or defense-industrial complex, DIC) of Russia are considered, which can facilitate the effective usage of dual-purpose technologies in various civilian fields of the national economy. In this context, the program of the 7th Specialized Exhibition “Dual-Purpose Products and Technologies: DIC Diversification,” which was held in Moscow in October 2006, is analyzed.     

Effect of DULAPIX Ca thinning agent on the rheological properties of majolica slip

The use of a nontraditional electrolyte, DULAPIX Ca, in thinning of majolica paste allows reducing the moisture content of the slip. The degree of the decrease in the moisture content of the slip is a function of the hardness of the water: the higher the hardness, the greater the content of the electrolyte in the slip. For this reason, the hardness of the water must be monitored and softened water must be used in production of majolica slip.     

Undesirable sensory properties of the dried pea (Pisum sativum). The rôle of saponins

The rôle of saponins in the undesirable sensory properties of the dried pea P sativum is reported. The sensory properties of isolated soyasaponin I are defined and described as bitter, astringent and metallic. The distribution of saponin in various air-classified pea flour fractions shows that the protein-rich fraction may contain sufficient saponin to cause undesirable tastes.