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Article
Thermodynamic Modeling of Radioactive Graphite Heating in Nitrogen and Oxygenized Air
The paper investigates the structure and phase transformations of uranium to condensed and gaseous states during the treatment of radioactive graphite. Thermodynamic modeling of this process is performed in Te...
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Article
Study of the Sorption and Catalytic Properties of Nickel Ferrite with Respect to 2,4-Dinitrophenol
Nanosized NiFe2O4 has been obtained using solution combustion synthesis (SCS). The predominant fraction of the particles has a size of 21–50 nm (TEM). The degree of degradation of 2,4-dinitrophenol in a Fenton-li...
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Article
Thermodynamic Modeling of Thermal Processes Involving Radionuclides of Uranium, Plutonium, Europium on Heating of Nuclear Graphite in Air
The behavior of U, Pu, and Eu radionuclides on heating of nuclear graphite in air was investigated by thermodynamic modeling. A complete thermodynamic analysis was preformed in the temperature range from 300 t...
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Article
Using a High-Frequency Ultrasound Scanner to Study the Cardiovascular System of a Danio rerio Embryo
The heart of a Danio rerio fish embryo 40–48 h after fertilization is studied in vivo using a pulsed scanning acoustic microscope in the 50–100 MHz range of frequencies. The technique allows the parameters of car...
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Article
Ultrasonic Visualization of Layered Objects
Pulsed acoustic microscopy (100–200 MHz) is used to study layers of pyrolytic graphite with a thickness of 40 μm on a glass substrate comparable to the wavelength of the probing sound. The mechanism of the nat...
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Article
Study of the Ultrasonic Field in an Acousto-Optic Crystal Using Acoustic Methods
Two methods are presented to estimate the structure of the acoustic field generated in the working medium of an acousto-optic (AO) modulator by its ultrasonic emitter. The first method employs an acoustic micr...
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Article
Thermodynamic Analysis of Compositions of Combustion Products of Radioactive Graphite in Water Vapor or Air
Distribution of plutonium and americium compounds in the combustion products of radioactive graphite in water vapor or air is analyzed. The study is carried out via thermodynamic analysis using the TERRA softw...
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Article
Application of Acoustic Microscopy for Visualization of Structural Displacement during the Development of Fish Embryos
Abstract—A technique for non-invasive ultrasound imaging of the processes of embryonic development of small biological organisms has been developed. A scanning acoustic microscope with an operating frequency rang...
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Article
Study of Eye Pathologies in the Japanese Quail Biomodel Coturnix japonica
The problem of eye pathologies, such as age-related macular dystrophy and children’s myopia, is becoming increasingly relevant every year. The influence of the spectral composition of artificial lighting that ...
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Article
Sonography of the Heart of Weatherfish Misgurnus fossilis at the Prelarval Stage of Development
The article describes a method for hearts of lower vertebrates in the early stages of their development. To achieve sufficient spatial resolution, the method uses an acoustic microscope with mechanical scannin...
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Article
Ultrasonic Visualization of the Dynamics of Fracturing for Reinforced Composites
The structure of samples is studied using a pulsed acoustic microscope combined with a specially designed miniature testing machine. The features of such experiments are considered. The possibility of measurin...
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Article
Measuring the Speed of Sound in Tissues of Teleost Fish Embryos
A noninvasive procedure for ultrasound imaging is developed to study the structure of fish embryos and measuring the speed of sound in their tissues. Loach (Misgurnus fossilis) eggs growing in the immersion cell ...
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Article
Analysis of Dynamic Processes in Biological Systems Using Acousto-Optic Video Spectrometry
A measurement setup based on a transmission microscope with double acousto-optical wavelength selection is proposed for detection of high-quality spectral images with a size of 1920 × 1200 pixels in the visibl...
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Article
Ultrasound Imaging through Layers with Unknown Parameters
Abstract—A method is presented for generating ultrasound images in imaging devices with phased arrays, based on decomposition of the recorded spatiotemporal signal into a spectrum of plane pulsed waves. A case is...
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Article
Ultrasonic Imaging in Layered Objects by Decomposing Spatiotemporal Signals into a Plane Wave Spectrum
A phased array approach to ultrasonic imaging through a set of layers with unknown parameters is considered. The technique is based on decomposing a recorded signal into a spectrum of plane pulsed waves and co...
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Article
Near-Field Defects Imaging in Thin DLC Coatings Using High-Frequency Scanning Acoustic Microscopy
A high-frequency scanning acoustic microscope (SAM) operating at 1–1.3 GHz was used to investigate subsurface defects in diamond-like carbon (DLC) films that were 2–3 μm thick. Because the wavelength of the lo...
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Article
Using Plane Pulsed Acoustic Waves in Devices with Phased Gratings for Ultrasonic Imaging in Layered Media
A new method of constructing ultrasonic images in layered media is proposed that is based on the radiation and reception of plane pulsed waves at various angles. Upon passage via a set of layers, plane pulsed ...
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Article
Synthesis of New Materials in the Boron–Carbon System
Experimental results from the synthesis of diamond-like BC x compounds with the aid of high-pressure techniques and laser sputtering methods are presented. A combination of uniq...
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Article
Processing an acoustic microscope’s spatiotemporal signal to determine the parameters of an isotropic layer
This paper presents a method for measuring the thickness and velocities of body waves and the density of an isotropic layer by a pulse scanning acoustic microscope. The method is based on recording the microsc...
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Article
Low-temperature aging of ceramic on the basis of tetragonal zirconium dioxide stabilized by cations of yttrium and ytterbium
The effect of low-temperature aging of ceramics Zr0.97Y0.03O2 (Y-TZP) and Zr0.98Y0.02O2 (Yb-TZP) by the methods of the high-grade diffraction analysis and atomic force microckopy is studied. Formation of the phas...
