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Article
Improving and Evaluating the Performance of a Ramjet Combustor under Conditions of Attached Air Supply with a Thrust Meter
This paper presents an analysis of approaches to ensuring the performance of a ramjet combustor using an unconventional method of measuring the thrust in testing an experimental model of a liquid-fuel combusto...
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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 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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Chapter and Conference Paper
Digital Model for Predictive Assessment of a Power Transformer Technical Condition
The reliability and safety of the electrical power system are ensured by monitoring and diagnosing the technical state of the equipment that comprises the power system. Power transformers are one of the most i...
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Article
Acoustic Visualization of Damage in the Structure of Carbon Fiber Reinforced Plastic Composites after Mechanical Treatment
Pulsed acoustic microscopy in the 50–100 MHz range is used to study the effect mechanical treatment has on the bulk structure of carbon fiber reinforced plastic composites (CFRPs). Acoustic images of composite...
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Article
Determination of Fracture Toughness of Carbon Fiber Reinforced Plastics Free of the Crack Initiator Using Acoustic Microscopy
One of the crack resistance characteristics of carbon fiber reinforced plastics (CFRPs) is fracture toughness, which is the change in the elastic deformation energy of the structural element upon the increase ...
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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
Biocompatibility and Bioresorption of 3D-Printed Polylactide and Polyglycolide Tissue Membranes
We studied biocompatibility and bioresorption of 3D-printed polylactide and polyglycolide tissue membranes. Ultrasound microscopy and histological examination showed that membranes fabricated of a copolymer of...
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Article
Local Elastic Measurements in Solids Using the Acoustic Transformer Technique
The effect of transformation of focused ultrasound radiation into collimated beams of longitudinal and transverse waves in the volume of a hemispherical transformer after refraction on its surface has been des...
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Article
Develo** Techniques of Acoustic Microscopy for Monitoring Processes of Osteogenesis in Regenerative Medicine
High-resolution ultrasonic imaging techniques are necessary for the non-invasive diagnostics of artificial cell-matrix systems. The results from experimental studies show these techniques are sensitive to vari...
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Article
Spatial Resolution of Acoustic Microscopy in the Visualization of Interfaces inside a Solid
The volumetric visualization of materials and inner boundaries of a joint is one of the fields in which long-focus high-frequency beams are used. Visualization is carried out using beams that passed through th...
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Article
High-Resolution Ultrasound Technologies for Studying Biological Objects
Russian experience in the development of high-resolution ultrasound technologies for bioimaging is considered. Two types of ultrasound biomicroscopy (UBM) systems for the in vivo imaging of skin are described:...
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Article
Studying the Degradation of Reinforced Composites by High-Resolution Ultrasonic Means
Nondestructive means of pulsed acoustic microscopy are used to visualize and assess the bulk microstructure of carbon fiber reinforced composites. Irreversible changes in the composite structure under the infl...
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Article
Differential Model and Evaluation of the Formal Kinetic Law in the Analysis of Combustion in a Solid-Propellant Gas Generator
This paper presents an approach to the generalization of the features of solid propellant combustion in gas generators of propulsion systems based on a one-dimensional differential model. The heat release rate...
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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
Ultrasonic microscopy of contact joints
Ultrasonic techniques allow examination of internal structure and the detection of discontinuities at the interface of various joints. Contact joints obtained via diffusion welding, sintering, and other adhesi...
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Article
Studying the dynamics of microdefect growth in carbon fiber reinforced plastics under mechanical loading by means of ultrasonic microscopy
Strength characteristics of carbon fiber reinforced plastics (CFRPs) are investigated by nondestructive means as microstructural changes in a material’s bulk under external mechanical loads. CFRP microstructur...
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Article
Effect of hydrothermal influence on properties and microstructure of bioinert ceramic Yb–TZP
It is found that a ceramic based on zirconia modified with oxides of yttrium and ytterbium (Yb–TZP) maintains high mechanical properties after hydrothermal treatment, equivalent to 20 years of residence of an ...
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Article
Methods of pulsed acoustic microscopy in industrial diagnostics
A brief review of the methods of pulsed acoustic microscopy is presented. The problems and possibilities of nondestructive ultrasonic high-resolution monitoring are discussed. It is shown that methods of pulse...
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Article
A concept of increasing efficiency for ramjet operation
The vortical mixing concept in the ramjet channel is analyzed. The results of simulating the gasodynamic scheme permit the concept of increasing efficiency for ramjet operation to be substantiated.
