Synthesis and spectral investigation of alkyl methacrylates with halogenated carbazolyl pendant groups for photonics applications

The alkyl methacrylates with halogenated carbazolyl pendant groups were prepared, and the analysis of their absorption and emission spectra showed that the polymers containing monohalogenatged carbazole rings were capable of exhibiting a high singlet‐triplet (S‐T) conversion. The reasons that mainly triplet excitons could be observed in such polymers and additional bands appearance in the spectra of the polymers with dihalogenated carbazole rings are discussed. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1650–1656, 2002; DOI 10.1002/app.10469     

Quality nonuniformity factors for sheet steel

Structural and fractographic analyses have showed that the nonuniform quality of sheets made from steels St3sp, 10–15KhSND, and 09G2S is due to heterogeneous structures of the metals, the appearance of which is due to the manufacturing heredity when the tolerance range of through technology is wide. This decreases the efficiency of control by perturbation method and the depth of prediction of properties when the simulation is limited by the structural transformations occurring in the course of rolling. To find the factors determining the quality nonuniformity of sheet products, it is reasonable to widen the application of statistical processing of manufacturing supervision data and to develop and implement methods for quality control of sheet products, which are based on studying the geometry of structure and fracture (from the type of fracture).     

Heterogeneous structure and fracture of iron-based alloys and their measurement

The possibilities of computerized procedures for comparing the heterogeneous structures and the fractures of hard alloys are estimated in order to evaluate the factors determining the wear resistance of hard iron-based alloys and premature fracture.     

Relation between the Nonuniformity of the Properties and the Structure of Large Forgings

Heterogeneous different-scale structures in large forgings made of a heat-hardenable Cr–Ni–Mo steel are compared. The effect of heterogeneity on the properties of the metal is evaluated.     

State and Properties of a Carbon Sorbent Modified with a Bioactive Substance

Protection of Metals and Physical Chemistry of Surfaces - A method for introducing small amounts of betulin (up to 1 wt %) into a mesoporous carbon material with a preset specific surface area of...     

Calculation of the flow capacity of a gas channel in the sources of beams of fast neutral particles by means of the Monte-Carlo method

This paper describes the model based on the Monte-Carlo method and presents the results of the mathematical simulation of the flow capacity of the exit aperture for an ion source with a ribbon-shaped beam and for the same source equipped with the system for ion beam neutralization and the electrostatic deflection system. For the designs mentioned above distributions of the normalized pressure and the collision thickness of gas along the channel axis are given. The results obtained are indicative of the fairly strong effect of these design elements on the flow capacity and, consequently, on the operating conditions of the ion source. The results of simulation can be used for correcting the value of the gas flow rate in the source for the purpose of maintaining invariant conditions of discharge glow, as well as for evaluating the effectiveness of the process of ion charge exchange in the source channel.