Search of regions of interest in objects showing signs of a spot on locally homogeneous scenes

It is suggested that while searching a scene for objects of known sizes by means of spectral and geometrical signs, instead of segmentation of the entire scene, only those fragments that contain the objects themselves and their surroundings be segmented. The formalization of a search query in the scene of such fragments, called regions of interest, is discussed, methods of its solution are suggested, and the results obtained are examined further.     

Influence of temperature on the speciation of radionuclides sorbed onto rocks from the Nizhnekansky massif

The influence of temperature on speciation of actinides (Pu, Am) and some fission products (Cs, Sr), sorbed from simulated groundwater onto rocks from the Nizhnekansky massif (gneiss, dolerite) under anaerobic conditions at 20 and 90°С, was studied by sequential extraction. An increase in the contact temperature leads to an increase in the radionuclide uptake percentage and, in some cases, in the content of tightly fixed forms. The radionuclide species undergo redistribution with time.     

Increase in the efficiency of ultrasonic processing of components made of brittle materials

A study of the ultrasonic dimensional processing of KU-1-grade quartz glass, SO-115-grade glass ceramics, tungsten carbide, and KP-1-grade alumina ceramics at different amplitudes and frequencies of the ultrasound effect has been carried out. The dependence of the value of defects (cleavages) on the amplitude-frequency characteristics of the ultrasound and the structural features of the material being processed has been determined. It has been determined that, by applying certain oscillation frequencies of the tool during processing at lower amplitudes, one can reduce the sizes of cracks (cleavages) and the magnitude of roughness while preserving the process performance. It has been shown that the hardening of working surface of the tool based on the exposure of low-temperature plasma of combined discharge makes it possible to increase its age resistance by up to three times.     

Monitoring and control of the oxygen content in heavy liquid-metal coolants for anticorrosion protection of steels

The results of research and development in the field of monitoring and control of oxygen content (thermodynamic activity) in heavy liquid metal coolants (Pb, Pb–Bi) are presented. The properties of lead and eutectics 44.5% Pb–55.5% Bi defining the specific features of their application as coolants in nuclear power plants are considered. Data on oxygen solubility in lead and lead–bismuth melts and the empirical dependences for calculation of the kinetic characteristics of lead oxide dissolution are given. Methods and devices for monitoring and control of the oxygen content (thermodynamic activity) in heavy coolants are considered.     

Forging and pressing technology at PAO Ruspolimet

New developments in forging and pressing technology at PAO Ruspolimet are considered. New methods of producing shells, disks, plates, and shafts are presented.     

New Octopus-like Phthalocyanines as Fullerene Receptors: Synthesis and Photophysical Investigation

Octopus-like zinc and magnesium phthalocyaninates bearing eight flexible benzylated diethylene glycol chains were synthesized and their interaction with fullerenes C₆₀ and C₇₀ was investigated by UV-Vis spectrophotometric titration, as well as by steady-state and time-resolved fluorescence spectroscopy in chloroform and toluene media. These measurements revealed a high affinity of receptors for C₆₀ and C₇₀, with selectivity to C₇₀: binding constants for C₇₀ are almost two times higher than for C₆₀. These results are interpreted by means of quantum-chemical calculations using the PM6-DH2 Hamiltonian. The binding constants also depend on both the nature of the metal ion in the receptor and the solvent. It is expected that the obtained molecules and supramolecular complexes can be used for further elaboration of optoelectronic donor-acceptor materials.     

The Main Directions for Increasing the Tool Life of a Metal Cutting Tool with Modified Working Parts

Journal of Machinery Manufacture and Reliability - In this paper, studies aimed to substantiate the directions of improving the reliability of a metal-cutting tool with working parts modified in...