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Article
Structure of the Upper Part of the Earth’s Crust in the Area of the Lena River Delta: The First Magnetotelluric Data
We present the first magnetotelluric sounding (MTS) data acquired in the southern part of the Lena River delta which is a junction zone of the Siberian Craton and the Verkhoyansk fold-and-thrust belt, in the t...
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Article
Physical Properties of Nanoconcrete
Studies have been carried out aimed at improving the corrosion resistance of concrete and its other characteristics for operation in harsh environmental conditions. The influence of a complex additive containi...
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Article
Investigation of the Structure of a Cement Composite Modified by Hydrothermal SiO2 Nanoparticles and MCNT Nanoparticles by the X-Ray Phase Analysis Method
The x-ray phase analysis method has been used to study the effects of small doses of hydrothermal SiO2 nanoparticles and nanoparticles of multiwalled carbon nanotubes (MCNTs) on the structure of a Portland cement...
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Article
Assessing Fatigue Failure Probability for Structural Components under Deterministic and Stochastic Loading Taking into Account the Initial Crack Size Scatter
An analytical approach that provides obtaining conservative estimates for the probability of fatigue brittle failure in the structural components of technical systems taking into account the scatter in the ini...
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Article
Studying the Structure of a Cement Composite Modified by Hydrothermal SiO2 Nanoparticles and MCNTs by the IR-Spectroscopy Method
The influence of hydrothermal small doses of SiO2 nanoparticles (NPs) and multiwalled carbon nanotubes (MCNTs) separately and combined with adding a polycarboxylate superplasticizer (SP) at the water–cement ratio...
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Article
A New Approach to Calculating the Adsorption Characteristics of Low Molecular Blood Components of Patients with Heart Failure
Despite the fact that the methods of dynamic interphase tensiometry and rheology are used for the study of blood and other biological fluids, there is no single unified approach in the methodology of analysis ...
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Article
Fracture Toughness of Nanofiber-Reinforced Concrete on Normal Separation and In-Plane Shear
Tests were carried out on various nanoconcrete matrices and with different dispersed reinforcement fabric: carbon nanotubes, basalt fiber (polymer, 3 types of steel, and their combinations). It has been establ...
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Article
Nanoindentation Method for Studying the Structure of Modified Cement Stone
Preliminary results for the cement specimens under study have been obtained by the nanoindentation method. It has been found that the elastic modulus increases in the specimens that contain a complex admixture...
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Article
Assessment of the Probability of Fatigue Fracture of Structural Components with Accounting for the Statistical Scatter of Mechanical Properties of the Material and the Residual Defectness
The paper presents a method for assessing the probability of fracture of structural components of technical systems subjected to monotonic and cyclic loading, which permits taking into account the scatter of m...
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Article
Encapsulation of Oil Phases with Different Compositions into a Shell Composed of Nanoparticles of Natural Hydrothermal Silica and Polyelectrolyte Layers
Particles of natural hydrothermal nanosilica have been characterized, and the conditions of their self-organization have been chosen for the stabilization of oil-in-water emulsions with the use of a cationic s...
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Article
Mechanism for Improving the Strength of a Cement Material Modified by SiO2 Nanoparticles and Multiwall Carbon Nanotubes
The authors have given results of investigations into the phase transformations of a cement material modified by a complex nanodisperse admixture that consists of a superplasticizer and nanoparticles (nanosili...
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Article
Modification of Cement Concrete by Admixtures Containing Nanosized Materials
Experimental studies of several types of nanomaterials (nanosilica, nanocarbon) and comparison of the results of their applications in cement concrete have been carried out. It has been established that the ch...
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Article
Surface Tension and Dilatational Rheology of Blood in Patients Subjected to Cardiological Operations under Conditions of Artificial Circulation
Pendant drop and bubble shape methods are employed to study the tensiometric and rheological parameters of blood serum and plasma in 45 patients 49–70 years old subjected to surgical operations under the condi...
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Article
Numerical Simulation of the Polycondensation of Orthosilicic Acid and of the Formation of Silica Particles in Hydrothermal Solutions
This paper reports numerical modeling work for the polycondensation of orthosilicic acid (OSA) and the growth of the number of silica particles (SiO2) in hydrothermal solutions under a variety of physical and che...
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Article
The Preparation, Properties, and Application of Nanosilica Based on Hydrothermal Solutions
Experiments on the preparation of sols and nanopowders of SiO2 based on hydrothermal solutions are performed. In order to achieve a result, processes of polycondensation of orthosilicic acid, ultrafiltration memb...
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Article
Characteristics of NanoSilica Produced from Hydrothermal Solutions
SiO2 sols and nanopowders are produced from hydrothermal solutions using the following processes: polycondensation of orthosilicic acid, ultrafiltration membrane concentration, and cryochemical vacuum sublimation...
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Article
Verification of a Numerical Technique for Investigating the Flow of a Cooling Medium in a Crescent-Shaped Gap of the Self-Lubricating Bearing of a Turbine Unit
Results of a verification of a numerical technique for investigating the hydrodynamic characteristics of gases and liquids in the gap of metal-polymer sliding friction bearing assemblies that function in a dry...
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Article
Numerical simulation for polycondensation of orthosilicic acid in hydrothermal solutions
This paper describes numerical simulation of the polycondensation of orthosilicic acid in geothermal solutions under a variety of physical and chemical conditions, including temperature, pH, mineral content, a...
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Article
Determination of the Containment Lifetime Characteristics as a Problem of Controlling the Life Cycle of NPP with VVER-1000
A systems approach to evaluating the service life of the reinforced, prestressed, concrete, containment shell of an NPP with VVER-1000 is examined. The main steps in evaluating the technical condition and rema...
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Article
Patterns of Alloy Deformation by Pulsed Pressure
Patterns of alloy deformation for optimization of a welding regime are studied by the method of modeling and deformation profiles providing high deformation quality are determined. A model of stepwise kinetics...
