Structure-activity relationship of synthetic pheromone components in sex communication of click beetles (Coleoptera,Elateridae)

It has been shown earlier that various geranyl and (E,E)-farnesyl esters are major components of natural sex pheromones of click beetles,Agriotes. In addition, some isomeric terpene esters have an inhibiting or synergistic influence upon the sex communication of some species ofAgriotes. In this paper the influence of synthetic terpene esters in pheromone compositions on the sex communication of differentAgriotes species occurring in different climatic zones has been studied. The relationship between the biological activity of sex attractants and their chemical structure has been established.     

Properties of structural steels used for shafts of turbodrills

The experimental steel 35Kh3GSFB is better than the series produced steel as regards resistance to fatigue fracture, wear resistance, and bulk hardenability; it can therefore be recommended for industrial production and as material for shafts of turbodrills. Steel 35Kh3GSFB is somewhat inferior to the series produced steel as regards resistance to brittle fracture, and it is more prone to temper brittleness but that is not of decisive importance for the operating conditions of shafts of turbodrills.Azerbaijan Polytechnic Institute; I. P. Bardin Central Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 37–38, July, 1991.     

Variability and inheritability of the "level of endogenous SH groups" trait in cell and clone populations of transplantable rat tumors

Heterogeneity of cell and clone populations in various histogenesis of rat tumours has been studied by the content of the endogenic SH-groups. The distribution of the ovary tumour cells and their clone lines, as well as lung clones of the sublines of rat rhabdomyosarcoma RA-2 as to the content of endogenic SH-groups is of persistent and monopeak character. Modal classes are well expressed, in several clone lines variability of the cell composition is higher than in the initial population. In this case the distribution of cells as to the SH-group content differs from the normal (asymmetrically). The level of SH-groups in the RA-2 rat subclone in 71 lung clones positively correlates with the level in hypodermic transplants. So, the heterogeneity of the clone populations as to the amount of SH-groups depends on both the genetic interclonal differences and fluctuations of the environmental factors.     

Structure and growth peculiarities of Tl1bSe1bTlInSe2

The crystal structure and growth peculiarities of isomorphic pairs like Tl1bSe1bTlInSe₂ are investigated in this paper. The structure of TlInSe₂ in projection and in polyhedrons, photographs of grown crystals with different geometrical configurations, as well as microphotographs of the boundary of epitaxially grown Tl1bSe1bTlInSe₂ heterojunctions are represented.     

Temperature Dependence of the Conductivity of Tellurium Whiskers

Semiconductors - A comparative analysis of the electrical conductivity of whisker, epitaxial film, and single crystal of tellurium was undertaken in the 77–273 K temperature range. The...     

New technology for heat treating leaf-spring sheets for trucks

Conclusion New technology and automatic equipment for heat treating leaf-spring sheets based on using induction heating, rapid cooling by a stream of water, and a specially developed steel with controllable hardenability have been developed.The new technology makes it possible for one production example to obtain a highstrength hardened layer (_f2500 N/mm²), a strengthened core (_f1200 N/mm²), and compressive residual stresses in surface layers which in combination provide high service properties for leaf springs and the possibility of reducing their weight by 15–25%.The new technology also makes it basically possible to automate the heat treatment process for leaf-spring sheets, to improve working conditions, and as a result of this, to exclude the use of quenching oil to improve the ecological atmosphere of the heat treatment workshop and also to exclude the work hardening operation with shot.Scientific Production Association "Tekhmash." Sinel'nikov Leaf Spring Factory. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 11–14, February, 1992.     

Dependence of the surface generation velocity at silicon-(lead borosilicate) glass interface on conditions of nonequilibrium depletion region formation

The generation characteristics of silicon-(lead borosilicate) glass interface have been studied by the method of isothermal capacitance transient spectroscopy in the metal-insulator-semiconductor (MIS) structure. It is established that the effective surface generation velocity depends on the amplitude of the inverting voltage pulse that drives the MIS structure out of the equilibrium state. The observed dependence may be caused by the injection of charge carriers through the silicon-glass interface followed by their localization on traps in the region of glass near the interface.     

Liquid-Phase Oxidation of Oil Hydrocarbons in the Presence of Nanostructured Mn-Containing Catalyst

The liquid-phase oxidation of a naphthene-paraffin concentrate obtained from a mixture of Azerbaijan oils is studied in the presence of a nanostructured Mn-containing catalyst with a carbon basis. It is found that the catalyst system represents a dispersion medium containing catalyst particles with a hydrodynamic diameter of 0.5–1.3 µm. It is shown that the catalyst can be used for the production of carboxylic acids with yields as high as 42.9%.     

Formation of nanoclusters of gadolinium atoms in silicon

A technology of stagewise low-temperature diffusion of gadolinium into silicon that makes it possible to form nanoclusters of impurity atoms with a significant magnetic moment distributed throughout the volume of the material has been developed. It is shown that, unlike the samples obtained by high-temperature diffusion doping, the samples prepared by the new technology do not have surface erosion, and alloys and silicides are not formed in the near-surface region. Nanoclusters of impurity atoms of gadolinium in the volume of the crystal lattice of the silicon are studied using an MIK-5 infrared microscope. It is found that, in the stagewise low-temperature diffusion, the temperature and time of the diffusion have an effect not only on the depth of penetration of the impurities but also on the sizes of the resulting clusters; these factors can also prevent the formation of clusters. The study of the effect of low-temperature treatments on the size and distribution of clusters shows that, upon annealing in the temperature range of 500–700°C, the ordering of the clusters of gadolinium impurity atoms is observed. A further increase in the annealing temperature leads to the destruction of gadolinium clusters in the silicon bulk.