174 research outputs found
THEORETICAL BASIS OF DESIGN AND PRODUCTION OF MARINE ROBOTICS
No full textBlintsov, V. S. Theoretical Basis of Design and Production of Marine Robotics / V. S. Blintsov, G. V. Babkin // Prospects and priorities of research in science and technology : collective monograph / Z. A. Babakhanova, V. S. Blintsov, G. V. Babkin etc. – Riga : Baltija Publishing, 2020. – P. 25–43
The nervous control of the pancreatic gland in the rabbit.
No full textThe investigation of the secretory function of the pancreas in the rabbit has interest from different points of view. It is not only interesting from a purely comparative physiological aspect, but the peculiarities of the function of the alimentary tract of the rabbit provide an opportunity to approach the study of the mechanism of pancreatic secretion from a new point of view. The great difference between the pancreatic secretion in herbivorous animals such as the rabbit and that of carnivorous animals such as the dog and cat, is that the secretion in the herbivors is continuous. This continuity of secretion was assumed by early investigators to be dependent on the unceasing digestive work of the stomach. In carnivors the stomach functions only for a few hours after a meal whereas in herbivorous animals the stomach ts always more or less full. [...
Microalloying by aluminum of the construction low-alloy steel with the purpose of increase of cold-resistance of casts
No full textIn the article there are given the results of investigation on important matter — cold-resistance of building steel 20 GL. There are given the explanations of effects occurring in steel during the process of thermal treatment at changing of its chemical composition
Investigations of solid-liquid interfaces in helium at ultralow temperatures
No full textThis Thesis describes ultralow temperature studies of helium quantum crystals. Owing to the surrounding superfluid, small latent heat of crystallization and correspondingly short relaxation times, which are unreachable in ordinary crystals, helium crystals offer a unique and clean modeling system to study surface phenomena in a solid. The measurements of the crystal shape and growth rates are essential in providing the microscopic understanding of crystal growth.
Optical observations are probably the most direct way to quantify the surface of crystals. The results presented in this Thesis were obtained with the help of two very powerful experimental techniques that were successfully adopted for ultralow temperature applications: optical interferometry and high-precision pressure measurements.
The optical investigations on 3He crystals revealed altogether eleven types of facets at temperatures well below 1 mK, while previously only three facet types have been seen. The growth rates of rough and smooth surface states were explored and show significant anisotropy. The measured growth velocities of different facet types indicate that the main growth mechanism is spiral growth in the regime of suppressed mobility. Important thermodynamic parameters of an interface such as the width of an elementary step and the step free energy were directly deduced from the observed growth kinetics. Results suggest that coupling of the interface to the underlying crystal lattice is relatively "strong" in 3He crystals.
Measurements of the spiral growth of the c-facet on 4He crystals in the presence of a small number of 3He atoms were also conducted. They show suppression of the crystal growth velocity with the increase of the 3He atom concentration and indicate "weak" coupling of the interface to the crystal lattice in 4He.reviewe
Integumentary Refine Fluxing Material for Melting of Copper Matrix Composite Alloys
No full textThe requirements for intergumentary refiing flxing material, used for melting of copper matrix
composite alloys (CA) are investigated. It offers the most effective composition of flx, not only
protecting the melt from oxidation by oxygen, but also from the penetration of hydrogen, which
can signifiantly improve the mechanical properties of the fiished product
Integumentary Refine Fluxing Material for Melting of Copper Matrix Composite Alloys
No full textThe requirements for intergumentary refiing flxing material, used for melting of copper matrix
composite alloys (CA) are investigated. It offers the most effective composition of flx, not only
protecting the melt from oxidation by oxygen, but also from the penetration of hydrogen, which
can signifiantly improve the mechanical properties of the fiished product
Effect of Oxygen on the Mechanical Properties of Copper and Copper-Matrix Composites Hardened by Melt-Synthesized Chromium Carbides
No full textТекст статьи не публикуется в открытом доступе в соответствии с политикой журнала.Abstract—Thermal analysis is used to study the saturation of the copper melt by oxygen from an oxygen-containing gas phase and the possibility of deoxidation of this melt by nanosized diamond–graphite, which
enters in the reaction mixture used to synthesize chromium carbide in the production of copper-matrix composites, are studied. The oxygen and chromium carbide contents are found to affect the mechanical properties of copper and copper-matrix composites. Diamond–graphite is shown to have a high refining ability,
which can substantially increase the plasticity of copper and copper-matrix composites. A low chromium carbide content is found to play a modifying role in grain refinement, and a high chromium carbide content is
shown to cause the formation of a precipitation-hardened structure and an increase in the physicomechanical
properties of copper-matrix composites
The results of treatment of chronic recurrent aphthous stomatitis by gel containing zero-valent silver
No full textThe article presents the results of complex treatment of chronic recurrent aphthous stomatitis by methylcellulose-based gel with arabinogalactan biocomposite containing zero-valent silver in nano-valent condition. The gel was applied 3-6 times a day at the prescription of Diquertin 0,06 g 3 times a day and Fibrolar 0,3g 3 times a day. The proposed method of treatment allows to improve the effectiveness of treatment by increasing remission and reducing treatment terms
Effect of Oxygen on the Mechanical Properties of Copper and Copper-Matrix Composites Hardened by Melt-Synthesized Chromium Carbides
No full textТекст статьи не публикуется в открытом доступе в соответствии с политикой журнала.Abstract—Thermal analysis is used to study the saturation of the copper melt by oxygen from an oxygen-containing gas phase and the possibility of deoxidation of this melt by nanosized diamond–graphite, which
enters in the reaction mixture used to synthesize chromium carbide in the production of copper-matrix composites, are studied. The oxygen and chromium carbide contents are found to affect the mechanical properties of copper and copper-matrix composites. Diamond–graphite is shown to have a high refining ability,
which can substantially increase the plasticity of copper and copper-matrix composites. A low chromium carbide content is found to play a modifying role in grain refinement, and a high chromium carbide content is
shown to cause the formation of a precipitation-hardened structure and an increase in the physicomechanical
properties of copper-matrix composites
- …
