Anti-corrosion ceramic coatings on the surface of Nd-Fe-B repelling magnets

The results of vacuum-arc deposition of thin ZrO₂coatings to protect the surface of Nd-Fe-B permanent magnets used as repelling devices in orthodontics are presented. The structure, phase composition and mechanical properties of zirconium dioxide films have been investigated by means of SEM, XRD, EDX, XRF and nanoindentation method. It was revealed the formation of polycrystalline ZrO₂ films of monoclinic modification with average grain size 25 nm. The influence of the ZrO₂ coating in terms of its barrier properties for corrosion in quasi-physiological 0.9 NaCl solution has been studied. Electrochemical measurements indicated good barrier properties of the coating on specimens in the physiological solution environment

RF-Magnetron sputtering of silicon carbide and silicon nitride films for solar cells

RF-magnetron nonreactive sputtering method from solid-phase target in argon atmosphere was used for obtaining thin silicon carbide and silicon nitride films, that are used for constructing solar cells based on substrates of single crystal silicon of p-typ

Temperature influence on the properties of thin Si₃N₄ films

Applying Raman spectroscopy, small-angle x-ray scattering, and atomic force microscopy it were studied phase composition and surface morphology of nanoscale films Si₃N₄ (obtained by RF magnetron sputtering

Comorbidity: alobar holoprosencephaly and pulmonary tuberculosis in a child (a case report)

Aim: to demonstrate the features of detection and management of a child with simultaneous alobar holoprosencephaly and pulmonary tuberculosis (TB) by the example from our own clinical observation. Materials and methods. A clinical case of our own observation of the simultaneous course of pulmonary TB and alobar holoprosencephaly in the child who was treated in the pediatric department of the clinical base of the Department of Phthysiatry and Pulmonology of Zaporizhzhia State Medical and Pharmaceutical University on Public Non-Profit Enterprise “Zaporizhzhia Regional Clinical and Diagnostic Center of Phthysiatry and Pulmonology” of Zaporizhzhia Regional Council. Results. The 4-year-old child diagnosed with pulmonary TB was admitted to the Pediatric Department. Previously, the child was diagnosed with alobar holoprosencephaly in a children’s hospital. His condition was severe due to the main disease. Family members, who had contact with the child, were examined to rule out TB. The index patient was a grandmother, who had recurrent drug-sensitive TB and was looking after the child living apart from the family. The treatment for TB was successful, but the child developed drug-induced hepatotoxicity. Also, the child had episodic convulsions when admitted to the department, which did not repeat after the prescribed treatment by a neurologist. Conclusions. Alobar holoprosencephaly is a severe and rare structural brain abnormality with complex and multifactorial causes. This condition can be identified at the first screening examination of a pregnant woman, so prenatal diagnosis is quite important. The disease leads to severe disability and requires assistance of physicians in different specialties. Treatment for tuberculosis is successful but demands more monitoring of side effects during antimycobacterial therapy

ГРАНУЛООБРАЗОВАНИЕ В ПОРОШКООБРАЗНЫХ МАТЕРИАЛАХ ПРИ ИСПОЛЬЗОВАНИИ ТЕХНОЛОГИИ «FATTENING»

In this paper we considered the granules formation process using the "fattening" technology in a granulation bowl. Development of rolling overgranulation technology primarily due to the need to obtain granules of larger size with much better quality indicators than those that can be attained in granular towers. Also, this technology gives granules with a complex chemical composition. Fattening is the process of overgranulation of an initial pellet by powder (with or without binding) by rolling in different devices, including bowls. The mathematical description of various embodiments of the process: with or without the birth of pellets. Besides, the process of fragmentation of the granules is considered separately. Fragmentation is usually an undesirable process, but sometimes it is not possible to get rid of it. The calculation results obtained by the models are represented as a series of graphic dependencies. We also develop algorithms that allow for the effect of fragmentation and agglomeration in arbitrary ratios. A block diagram of the implementation of the algorithm is also presented in the paper.Р ассмотрен процесс гранулообразования при использовании технологии «fattening» в грануляторах тарельчатого типа. Дано математическое описание различных вариантов протекания процесса, в том числе с учетом зарождения гранул и их возможного дробления