Explanipedia

Fractal Model of the Influence of Aggressive Environments on the Mechanical Properties of Heat-Resistant Steel 25CrMo4 Open

Ye. G. Plakhtii, O.Yu. Konoplianyk · 2025

The paper presents the results of a study of the effect of hydrogen sulphide (H2S) on the mechanical properties and microstructure of heat-resistant 25CrMo4 steel subjected to heat treatment and exposure to H2S for 730 hours without extern…

Investigation of the influence of the heterogeneous structure of concrete on its strength Open

V. M. Volchuk, M. A. Kotov, Ye. G. Plakhtii, O.A. TYMOSHENKO, O. H. Zinkevych · 2025

The structure heterogeneity and the strength of concrete was evaluated using multifractal analysis. The macrostructure of concrete with a predominance of crushed stone, sand and pores was studied. The relevance of the work lies in the poss…

Investigation of the Influence of the Heterogeneous Structure of Concrete on its Strength Open

Vladimir Volchuk, Nikolay Kotov, Olena Tymoshenko, Ye. G. Plakhtii, Oksana Zinkevych · 2024

Technology for Performing Emergency Dismantling Works at an Industrial Facility Destroyed Due to Military Actions Open

V. Naumov, A.I. BILOKON, И. В. Соколов, Ye. G. Plakhtii, P.I. Nesevrya · 2024

This investigation develops an innovative dismantling methodology for industrial facilities impacted by a 2022 missile strike, aiming to restore operations with minimal interruption. The purpose of the research is to establish a rapid and …

Investigation of the processing effect parameters on the spectroscopic properties of ZnSe nanocrys-tals for hot-pressed ceramics of the Cleartran and Multispectral classes Open

Ye. G. Plakhtii, Diana Hlushkova, V. M. Volchuk, Vladislav Saenko · 2023

Problem. The problem is unavailability of inexpensive ZnSe nanocrystals for hot-pressed ceramics of the Cleartran or Multispectral classes. Goal. The goal is to investigate and improve the structural features of ZnSe nanocrystals obtained …

INVESTIGATION OF PHOTOLUMINESCENCE OF ZnSxSe1-x AND ZnSxSe1-x:Mn NANOCRYSTALS OBTAINED BY COMBUSTION SYNTHESIS FOR OPTOELECTRIC DEVICES Open

Ye. G. Plakhtii, V. M. Volchuk, Ok.M. SHYBKO · 2023

The photoluminescence spectra of ZnSxSe1-x and ZnSxSe1-x : Mn nanocrystals obtained by combustion synthesis for all compositions with the parameter step x = 0.2 were registered. The movement of the maximum of the integral photoluminescence…

Crystal structure and photoluminescence of ZnSe and ZnSe:Mn nanocrystals obtained by combustion synthesis Open

Ye. G. Plakhtii, О. В. Хмеленко · 2023

ZnSe and ZnSe:Mn nanocrystals were obtained by combustion synthesis (self-propagating high-temperature synthesis) using current pulses to initiate a reaction with amplitudes of ∼35 A and ∼40 A. The magnitude of the amplitude of the current…

DEVELOPMENT AND RESEARCH OF NEW NANOMATERIALS FOR ELECTRONICS OF THE ZnSXSe1-X TYPE OBTAINED BY THE COMBUSTION SYNTHESIS METHOD Open

Ye. G. Plakhtii · 2022

Introduction. Nanocrystals of ZnSxSe1-x solid solutions were synthesized by the combustion synthesis method with a parameter step of x = 0.2, with reproducible and controlled properties and low cost. Results. The composition of the charge …

ПОЛУЧЕНИЕ И СВОЙСТВА НАНОКРИСТАЛЛОВ ZnSxSe1-x, СИНТЕЗИРОВАННЫХ МЕТОДОМ САМОРАСПРОСТРАНЯЮЩЕГОСЯ ВЫСОКОТЕМПЕРАТУРНОГО СИНТЕЗА Open

Ye. G. Plakhtii, В. С. Захвалинский · 2022

Методом самораспространяющегося высокотемпературного синтеза получены нанокристаллы твердых растворов ZnSxSe1-x. Полученная шихта представляет собой объединение нанокристаллов и поликристаллов. Поликристаллы образуются из-за высокой темпер…

Crystal Structure of ZnxCd1-xS Nanocrystals Obtained by Self-Propagating High-Temperature Synthesis Open

А. В. Коваленко, Ye. G. Plakhtii, О. В. Хмеленко · 2022

Нанокристали ZnxCd1-xS були отримані методом саморозповсюджуваного високотемпературного синтезу. Синтез проводили в повітряному середовищі за атмосферного тиску. Нам вдалося синтезувати нанокристали, близькі до CdS (0 ≤ x < 0,2), а також б…

Features of the crystal structure of ZnO:Mn nanocrystals obtained by ultrasonic spray pyrolysis Open

Oleg Kovalenko, V. Yu. Vorovsky, Vladimir Makarov, Ye. G. Plakhtii · 2021

Samples of ZnO and ZnO:Mn nanocrystals with Mn 2 and 4 at.% impurity concentrations obtained by ultrasonic spray pyrolysis were studied by X-ray diffraction. It was determined that the reflexes of the X-ray diffractions of the samples had …

Natural Languages vs Languages of Augmented Reality Open

O Panchenko, Anastasiia Plakhtii, Ye. G. Plakhtii · 2021

The article deals with the problem of mutual interaction of natural languages and the artificial languages which appear in augmented reality.The artificial languages which have recently appeared are creolized linguistic units, leet, LOL, t…

Peculiarities of doping of ZnO:Mn nanocrystals during their synthesis by the aerosol pyrolysis method Open

Oleg Kovalenko, V. Yu. Vorovsky, О. В. Хмеленко, Ye. G. Plakhtii · 2020

Samples of ZnO:Mn nanocrystals with Mn concentrations of 2 and 4 at.% were synthesized by ultrasonic aerosol pyrolysis. The synthesis was carried out at 550°C using aqueous solutions of zinc and manganese nitrates. The samples obtained wer…

Ferromagnetic properties of ZnO:Mn nanocrystals obtained by the freeze-drying method Open

Oleg Kovalenko, V. Yu. Vorovsky, О. В. Хмеленко, Ye. G. Plakhtii, O. I. Kushnerov · 2020

In the work, the nanocrystals ZnO and ZnO:Mn with a concentration of Mn 2 and 4 at.% were obtained by the low-temperature freeze-drying method. For this purpose, solutions of zinc acetate Zn(CH3COO)2∙2H2O and manganese one Mn(CH3COO)2∙4H2O…

The analysis of the EPR spectra in ZnO: Mn nanocrystals using the derivative spectroscopy method Open

Oleg Kovalenko, Ye. G. Plakhtii, О. В. Хмеленко, V. Yu. Vorovsky · 2019

A method for computer processing of experimental EPR spectra using the derivative spectroscopy method is proposed. Application of the proposed method to a wide, structureless line of the EPR spectrum in ZnO: Mn nanocrystals obtained by the…

Research of Photoluminescence Spectra of ZnSXSe1 – X:Mn Nanocrystals Obtained by Method of Self-propagating High-temperature Synthesis Open

Alexander Kovalenko, Ye. G. Plakhtii, О. В. Хмеленко · 2019

Досліджено спектри фотолюмінесценції нанокристалів твердих розчинів ZnSxSe1 – x:Mn, отриманих методом самопоширюваного високотемпературного синтезу. При кімнатній температурі ці нанокристали при всіх значеннях параметра х люмінесціювали у …

Method of smoothing photoluminescence spectra Open

Oleg Kovalenko, С. М. Вовк, Ye. G. Plakhtii · 2018

The smoothing method for experimental photoluminescence spectra, which uses Tikhonov regularization method, is proposed. Smoothing problem statement is performed as a statement of the minimization problem based on the least squares criteri…

Influence of heat treatment on photoluminescence spectra in ZnS:Mn crystals with hexagonal structure Open

Oleg Kovalenko, О. В. Хмеленко, Ye. G. Plakhtii · 2018

It has been investigated the influence of heat treatment with the following temperins on the integral photoluminescence spectra and on the individual bands of this spectra. It has been showed the correlation between the changes of intensit…

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