Methodology of biochemical stability determination of compositional systems based on hydroxyapatite

The growing quantity of people with bone pathology causes the urgency of finding the new reconstruction materials. However, their application may experience different side effects that result the rejection reactions. Materials based on hydroxyapatite are the most widely used in osteoplasty as this material is characterized by its non-toxicity, biocompatibility and corrosion resistance. Hydroxyapatite in its chemical composition is analogous to the mineral constituent of bone, contributing to its regeneration. Aim: The aim is to develop a comprehensive methodology to study the behavior of basalt scales and compositional system “hydroxyapatite + basalt scales” in environments that simulate fluids of living body. Materials and Methods: A comprehensive approach that includes specific preparing of samples and biological environments and complex chemical, photoelectric colorimetric and X-ray studies were applied to evaluate the biochemical stability of the studied material. Calibration curves were prepared during photoelectric colorimetry to determine the amount of substance. Two methods of sample preparation were used to determine the amount of total iron in the filtrate during the study of biochemical stability of the composition systems “hydroxyapatite + basalt scales” in physiological environments. Results: Based on the multichemical analysis it can be concluded about the physical and chemical stability in interaction of studied basalt scales powders and composite systems “hydroxyapatite + basalt scales” with the blood plasma and Ringer's solution and Ringer-Locke solution that imitate the fluid of a living body

Ground penetrating radars application for soil-pyroclastic cover survey of the south-eastern zone of Matua Island, the Kurile Islands

Matua is a volcanic island located in the central part of the Kurile-Kamchatka island arc. Its greater north-western part is occupied by the edifice of Sarychev Peak Volcano, which is one of the most active volcanoes in the Kuriles. The south-eastern part of the island is an ancient abrasion-accumulative terrace, which base is formed by weakly dislocated Pliocene-Eopleistocene volcanic-aqueous complexes overlapped with marine deposits and solid soil-pyroclastic cover. Besides, Matua Island is an area with a unique anthropogenic landscape shaped by the Japan army as a result of the construction of elaborated military fortifications in the first half of the 20th century. The paper provides the results of GPR investigation of the soil-pyroclastic cover on Matua Island. The survey included detection of hidden posterns, large-scale cavities and a GPR inspecting of fortifications areas. The results of GPR sounding are compared to geological profile data, which provide records for the explosive activity on the island over the period late Pleistocene to Holocene

METROLOGICAL ASSURANCE OF AUTOMATED PROCESS CONTROL SYSTEM OF CONTINUOUS CASTING COPPER ROD

Проанализированы методы и средства метрологического обеспечения для автоматизированной системы управления технологическим процессом непрерывного литья безкислородной медной катанки. Получили дальнейшее развитие методы измерения температуры подвижной металлической поверхности, заключающиеся в использовании для этой цели скользящей безспайной термопары с двумя термоэлектродами. Достигнута стабилизация технологических и электротехнических свойств медной катанки, получаемой на многоручьевой литейной машине, в соответствии с техническими условиями на производство.Проаналізовано методи та засоби метрологічного забезпечення для автоматизованої системи управління технологічним процесом безперервного лиття безкисневої мідної катанки. Отримали подальший розвиток методи вимірювання температури рухомої металевої поверхні, які полягають у використанні для цієї мети ковзної безспайної термопари з двома термоелектродами. Досягнуто стабілізація технологічних і електротехнічних властивостей мідної катанки, яку одержують на багатострумкової ливарної машині, відповідно до технічних умов на виробництво.The methods and means of metrological assurance for the automated process control system of continuous casting of oxygenfree copper wire rod. Further developed methods for measuring the moving metal surface temperature is to use for this purpose the sliding no junction thermocouple with two thermoelectrodes. Reached stabilization technology and electrical properties of the copper rod, received on multi-ribbed casting machine in accordance with the technical specifications for the production