MAGNETIC PROPERTIES AND MAGNETOCALORIC EFFECT OF Ho(Me0.84Fe0.16)2 COMPOUND, WHERE Me = Co, Ni

For a more detailed study of the effect of the 3d sublattice on the magnetic and magnetocaloric properties of compounds R(Сo-Fe)2, where R = Dy, Ho, Er, with a plate-like dependence ΔSm(Т), a series of Ho(Me0.84Fe0.16)2 samples, where Me = Co, CoNi и Ni, was synthesized and studied in this paper.Работа выполнена при поддержке Государственного контракта FEUZ 2023-0020 между УрФУ и Министерством высшего образования РФ

Superhard Phases of Simple Substances and Binary Compounds of the B-C-N-O System: from Diamond to the Latest Results (a Review)

The basic known and hypothetic one- and two-element phases of the B-C-N-O system (both superhard phases having diamond and boron structures and precursors to synthesize them) are described. The attention has been given to the structure, basic mechanical properties, and methods to identify and characterize the materials. For some phases that have been recently described in the literature the synthesis conditions at high pressures and temperatures are indicated.Comment: Review on superhard B-C-N-O phase

Predictors of atrial fibrillation in patients with dualchamber pacemakers

During prospective study the predictors of primary AF incidence were studied in 87 patients (mean age 64,3±10.5 years) with chronic ischemic heart disease after dual chamber pacemakers (DCP) implantation: 39 - with sick sinus syndrome (SSS), 43 - with the atrioventricular block II-III degree (AVB), 5 - with binodal disease. The end point was the primary incidence of sustained paroxysmal AF (>30 seconds). The primary AF development is noted at 16 (18,4%) patients later 10 months after DCP implantation. At comparison of groups with and without AF by means of Stjudents criterion and Fisher's nonparametric criterion the factors associating with AF have been revealed: presence AVB (p=0,004), a male (p=0,01), left atrium dilation (p=0,04), right ventricular stimulation percent >60% (p=0,009), atrial stimulation percent 30 сек. Первичное развитие ФП отмечено у 16 (18,4%) пациентов спустя 10 месяцев после имплантации ЭКС. При сравнении групп с ФП и без ФП с помощью критерия Стъюдента и непараметрического критерия Фишера были выявлены факторы, ассоциирующиеся с ФП: наличие АВБ (р=0,004), мужской пол (р=0,01), дилатация левого предсердия (р=0,04), доля правожелудочковой стимуляции >60% (р=0,009), доля предсердной стимуляции <35% (р=0,04), длительность детектируемой АВ-задержки <180мсек (р=0,03). Методом бинарной логистической регрессии выявлено 2 независимых предиктора ФП: длительность детектируемой АВ-задержки <180 мс и принадлежность к мужскому полу. Наличие в ЭКС алгоритма, способствующего спонтанному АВ проведению, достоверно снижало развитие ФП только при СССУ (р=0,02)