55 results on '"V. N. Zimin"'
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2. Thermal Mode of Two-Layer Heat-Protective Coating of a Ballistic Capsule When It Is Returning to the Earth with Parabolic Velocity
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V. S. Zarubin, V. N. Zimin, and V. V. Leonov
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Aerospace Engineering - Published
- 2022
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3. Influence of thermal conducting inclusions on the limiting potential difference of polymer composite electrical insulation
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V. S. Zarubin, V. N. Zimin, G. N. Kuvyrkin, and I. Yu Savelyeva
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Polymers and Plastics ,Materials Chemistry ,General Chemistry ,Condensed Matter Physics - Published
- 2022
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4. DUAL VARIATIONAL MODEL OF THE TEMPERATURE STATE OF THE DISK OF A UNIPOLAR GENERATOR
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V. S. Zarubin, V. N. Zimin, G. N. Kuvyrkin, and I. Yu. Savel'eva
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Mechanics of Materials ,Mechanical Engineering ,Condensed Matter Physics - Published
- 2022
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5. Thermo-Stressed State of a Hollow Polymer Dielectric Cylinder
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I. Yu. Savel’eva, V. S. Zarubin, A. N. Kuvyrkin, and V. N. Zimin
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Stress (mechanics) ,Work (thermodynamics) ,Materials science ,Thermal conductivity ,Field (physics) ,Electrical resistivity and conductivity ,General Engineering ,Cylinder ,Dielectric ,Electric potential ,Composite material ,Condensed Matter Physics - Abstract
The paper presents a mathematical model describing the distribution of stresses in a hollow cylinder caused by a one-dimensional steady temperature field occurring at an assigned fixed difference of electrical potentials on the surfaces of a cylinder made of polymer dielectric. A quantitative analysis of the model makes it possible to identify the effects of temperature dependences of the specific electrical resistivity, thermal conductivity coefficient, and mechanical characteristics of the dielectric material on the thermo-stressed state of the cylinder. The model reflects the conditions of work of the dielectric layer of a single fiber high DC-voltage cable. Estimates are given of the conditions for the occurrence of a thermal breakdown of a dielectric cylindrical layer and of the cylinder’s boundary state of stress which occurs in the case of planned or emergency nullification of electric potential difference. The results of such analysis can be useful for identifying possible areas of application of polymer dielectrics in various electrical devices.
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- 2021
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6. Mathematical model of thermal breakdown of electrical insulation made of polymer composite
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G. N. Kuvyrkin, I. Yu. Savelyeva, V. S. Zarubin, and V. N. Zimin
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Applied Mathematics ,General Mathematics ,General Physics and Astronomy - Published
- 2022
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7. Heating of Two-Layer Thermal Protection Coating at Hypersonic Flow around a Spherical Blunting
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V. S. Zarubin, V. N. Zimin, and V. V. Leonov
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Materials science ,Thermal conductivity ,Coating ,Heat flux ,Hypersonic flow ,Two layer ,Shell (structure) ,engineering ,Aerospace Engineering ,Thermal protection ,Composite material ,engineering.material - Abstract
The nonstationary problem of thermal conductivity in a two-layer thermal protection coating is under consideration. The solution is given for a metal hemispherical shell with axisymmetrical distribution of the heat flux density over the outer surface of the coating.
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- 2021
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8. Deformation of the Shell of the Cylindrical Cryogenic Tank during its Filling
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V. S. Zarubin, G. N. Kuvyrkin, and V. N. Zimin
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Compressive load ,Materials science ,Buckling ,Line (geometry) ,Shell (structure) ,Aerospace Engineering ,Radial displacement ,Generatrix ,Mechanics ,Deformation (meteorology) ,Action (physics) - Abstract
A complex mathematical model of the thermo-deformed state of a circular cylindrical shell reinforced by stringers for a vertically installed cryogenic tank during its filling was constructed. The model describes the local deviation of the shell generatrix due to the nonuniform temperature distribution and the action of an axial compressive load. Relations describing the temperature distribution along the shell and its radial displacement were obtained. The quantitative analysis of these relations was carried out. Estimations of the shell generating line deviation from the original rectilinear form, which can decrease the level of the critical axial loads and cause the shell buckling, are presented.
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- 2019
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9. Modeling of the deployment of transformable space structures with a shape memory alloy actuator
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N. G. Pavlov, V. S. Philippov, V. S. Zarubin, and V. N. Zimin
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Electric motor ,Software deployment ,Computer science ,Position (vector) ,Reliability (computer networking) ,media_common.quotation_subject ,Orbit (dynamics) ,Mechanical engineering ,Outer space ,Shape-memory alloy ,Actuator ,media_common - Abstract
Currently, the design of large space structures attracts engineers due to the need to solve pressing problems in the area of creating promising space systems for longitudinal operation in the outer space. A special class of space systems is formed by transformable structures whose layout can be transformed. Usually, the structures of this class are delivered to the working orbit in the densely-packed position. When the orbit having the required parameters is reached, the structure is deployed. The deployment is done by force actuators, for example, springs, electric motors, and so on. Transformable space structures are multiple-element systems comprised of many interconnected elements. Despite massive progress in the area of designing such structures, the task of ensuring smoothness and reliability of the deployment of structures with guaranteed functioning after deployment is still relevant. The paper proposes using actuators based on shape memory alloys to ensure controlled deployment of large transformable structures. Experimental investigations of a simple actuator based on the Ti-Ni alloy element confirmed the possibility of using it for the deployment of transformable space structures.
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- 2021
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10. Temperature State of a Hollow Cylinder Made of a Polymer Dielectric with Temperature-Dependent Characteristics
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G. N. Kuvyrkin, V. N. Zimin, and V. S. Zarubin
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Materials science ,Thermal conductivity ,Convective heat transfer ,Heat flux ,Mechanics of Materials ,Electrical resistivity and conductivity ,Mechanical Engineering ,Electric field ,Cylinder ,Dielectric ,Composite material ,Condensed Matter Physics ,Intensity (heat transfer) - Abstract
A mathematical model is constructed to describe a steady one-dimensional temperature distribution in a hollow circular cylinder made of a polymer dielectric with a constant difference in the electric field potentials on the cylinder surfaces. Based on systematized data on the dependence of the thermal conductivity and electrical conductivity of polymer materials used as dielectrics in engineering on temperature, a qualitative analysis of the model is performed for a prescribed density of the heat flux supplied to the inner surface of the cylinder and intensity of convective heat transfer on the outer surface The results obtained in the study allow one to determine the area of applicability of polymer dielectrics used in various electrical engineering applications, including electrical insulation of DC high-voltage cables, and to formulate the conditions for the thermal breakdown of the cylindrical layer of the dielectric.
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- 2019
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11. THE DEFINITE QUESTIONS OF SIMULATION OF TRANSFORMABLE SPACE STRUCTURES DYNAMICS
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V N Zimin, Zikun Zhang, A. V. Krylov, and S A Churilin
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Classical mechanics ,Movement (music) ,Computer science ,Dynamics (mechanics) ,Space (mathematics) - Published
- 2019
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12. Development of a mathematical model of a force actuator for the opening of a space structure with transformable configuration
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V N Zimin, A V Krylov, G N Kuvyrkin, and A O Shakhverdov
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History ,Computer Science Applications ,Education - Abstract
The prospects for the development of radio astronomy, solar energy, space communications, exploration of the Earth’s surface and other planets from space are currently associated with the creation of fundamentally new large-sized space structures. The inevitable complication of the design schemes of promising large-sized systems due to the increase in their operational functionality requires the development of mathematical models that adequately describe the mechanical properties of structures. When designing large-sized systems, the scheme of which allows for automatic configuration change of the structure, it is necessary to take into account shock loads. They inevitably arise when the working state of the structure fixes in orbit upon completion of the process of its opening. To ensure smooth, reliable and shock-free opening of large-sized space structures, it is proposed to use force actuators with active elements made of titanium nickelide material with a shape memory effect. During the tests of the active elements, the main parameters of the force actuator were determined: the generated force, the actuation time and the length of the working stroke. The length of the working stroke was determined by the change in the relative elongation of the active element of the force actuator during its heating. The conducted experimental and theoretical studies are aimed at developing a mathematical model of the functioning of an active element made of titanium nickelide with a shape memory effect for the opening of a space structure with transformable configuration.
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- 2022
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13. Estimation of the Combustion Chamber Shell Working Capacity for the Reusable Liquid-Propellant Rocket Engine
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V. N. Zimin, G. N. Kuvyrkin, and V. S. Zarubin
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Physics::Fluid Dynamics ,Materials science ,Liquid-propellant rocket ,business.industry ,Base (geometry) ,Shell (structure) ,Aerospace Engineering ,Working capacity ,Mechanical engineering ,Rocket engine ,Combustion chamber ,business ,Wall material - Abstract
On the base of the simplified analytical model for the bimetallic shell of the combustion chamber of the reusable liquid-propellant rocket engine, the analysis of the loading of connectors between the shell walls and the accumulation of inelastic deformations in the inner wall material was carried out. The results obtained can be used for evaluation of the maximal number of engine operation cycles.
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- 2018
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14. TEMPERATURE STATE AND ESTIMATION OF DEVIATION IN THE SHAPE OF THE SPHERICAL SHELL OF THE CALIBRATION SPACECRAFT IN THE SHADOW SECTION OF THE NEAR-EARTH ORBIT
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G. N. Kuvyrkin, V. N. Zimin, and V. S. Zarubin
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Physics ,Earth's orbit ,Spacecraft ,business.industry ,Section (archaeology) ,Shadow ,Calibration ,State (functional analysis) ,business ,Spherical shell ,Computational physics - Published
- 2018
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15. Temperature Distribution in the Spherical Shell of a Gauge-Alignment Spacecraft
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V. N. Zimin, V. S. Zarubin, and G. N. Kuvyrkin
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Physics ,Spacecraft ,business.industry ,Mechanical Engineering ,Shell (structure) ,02 engineering and technology ,Gauge (firearms) ,Condensed Matter Physics ,Rotation ,01 natural sciences ,Spherical shell ,010305 fluids & plasmas ,Computational physics ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Mechanics of Materials ,Orientation (geometry) ,Physics::Space Physics ,0103 physical sciences ,Perpendicular ,business ,Constant angular velocity - Abstract
A thermal model for the aluminized polymer shell of a gauge-alignment spacecraft was developed to calculate the steady-state temperature distribution of this shell at a fixed orientation to the Sun. A modified version of the model was used to analyze the quasistationary distribution of the shell temperature in the case of its rotation with a constant angular velocity about an axis perpendicular the direction to the Sun.
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- 2017
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16. Thermal state of the shell for supersonic part of the ramjet nozzle
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G. P. Zarubin, V. N. Zimin, and G. N. Kuvyrkin
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0209 industrial biotechnology ,Materials science ,Nozzle ,Shell (structure) ,Aerospace Engineering ,02 engineering and technology ,Mechanics ,020303 mechanical engineering & transports ,020901 industrial engineering & automation ,0203 mechanical engineering ,Physics::Atomic and Molecular Clusters ,Thermal state ,Supersonic speed ,Ramjet - Abstract
A mathematical model describing the temperature distribution in a non-cooled nozzle shell was constructed. Analysis of this model showed that the extreme temperatures are permissible for some modern and promising heat-resistant composite materials.
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- 2017
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17. On the analysis of a rotating solar sail
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N. A. Nerovnyi and V. N. Zimin
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Materials science ,business.industry ,General Physics and Astronomy ,02 engineering and technology ,Solar sail ,Mechanics ,010402 general chemistry ,021001 nanoscience & nanotechnology ,medicine.disease_cause ,01 natural sciences ,Electromagnetic radiation ,0104 chemical sciences ,Condensed Matter::Materials Science ,Optics ,Mechanics of Materials ,Deflection (engineering) ,Physics::Space Physics ,Turn (geometry) ,medicine ,Transmission coefficient ,Deformation (engineering) ,Thin film ,0210 nano-technology ,business ,Ultraviolet - Abstract
The problem of determining the transmission coefficient of thin-film materials of large-size convertible space structures depending on the value of their deformation is considered. A technique is presented for determining the transmission coefficient in the apparent and near infrared and ultraviolet ranges of lengths of electromagnetic waves depending on the value of the longitudinal strain in the uniaxial extension of the thin-film material specimen. The results of experiments with the polyethyleneterephthalate (PETPh) aluminum-backed film showed that the normal integral transmission coefficient can vary in broad limits and its significant growth begins as the longitudinal strain is greater than 10%. A numerical example shows that a decrease in the deflection of the end point of the nonideal solar sail results in a variation in the propulsive force. This, in turn, affects the ballistic parameters of the solar sail.
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- 2017
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18. Development of the mathematical model of the force actuator for deployment of large-sized space structures
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A O Shakhverdov, V N Zimin, and A V Krylov
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History ,Development (topology) ,Software deployment ,business.industry ,Computer science ,Aerospace engineering ,business ,Space (mathematics) ,Actuator ,Computer Science Applications ,Education - Abstract
A special class of large-sized space systems is formed by transformable structures that have different configurations in transport and operating states. Transformable large-sized space structures are delivered into orbits in a folded transport state and after that they are deployed into operating position. Now problems of the mathematical modeling of deployment dynamics of such systems attract a great interest of scientists. When the structure is transformed, impact dynamic loads arise in the system elements. To ensure a smooth «controlled» opening of the transformable structures and to exclude the dynamic impact loads in their constructed elements, it is proposed to use force actuators made of material with a shape memory effect. Now, to create mechanisms with elements made of the materials with the shape memory effect, the role of experimental methods is very important. Preliminary experimental studies of the force actuator made of such material as titanium nickelide were carried out. Deformation and force characteristics of the actuator obtained in these studies prove the possibility to use it for reliable deployment of the promising transformable space structures. Based on the fulfilled theoretical and experimental studies, the mathematical model describing the force actuator functionality is proposed.
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- 2021
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19. An Approximate Analysis of the Inner Wall Loading of a Bimetallic Camera Shell of Reusable Rocket Engine
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V. S. Zarubin, V. N. Zimin, and G. N. Kuvyrkin
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Engineering ,business.industry ,Liquid-propellant rocket ,lcsh:Motor vehicles. Aeronautics. Astronautics ,Shell (structure) ,chemistry.chemical_element ,General Medicine ,Structural engineering ,short-term creep ,Combustion ,engine combustion chamber ,Copper ,bimetallic shell ,ideal elastic-plastic medium ,Creep ,chemistry ,Thermal ,Combustion chamber ,Composite material ,lcsh:TL1-4050 ,business ,Bimetallic strip - Abstract
Various technical devices quite widely use bimetallic shells as the structural elements. A chamber combustion design of the liquid rocket engine (LRE) is a typical use of the bimetallic shells. In LRE operation a combustion chamber shell is subject to intense thermal and mechanical effects, which necessitates cooling. A cooling shell path is formed by a gap between its inner and outer walls connected to each other by milled or grooved spacer ribs. The outer wall of the shell serves as a load-bearing element, the inner wall is in direct contact with high-temperature combustion products and exposed to intense heat. The difference in functions of shell walls calls for their manufacturing from different materials with different thermophysical and mechanical properties. Interaction between the shell walls of different materials in heating and cooling leads to emerging thermal strains of various values in the walls. In terms of mechanical properties the inner wall material, usually ranks below the outer wall material strength, which uses the high strength stainless steel 12Х21Н5Т. The inner wall is typically made from copper-based highly heat-conductive alloys. (eg.: chromium bronze). Therefore, the result of the difference in temperature deformations, arising in the walls, is inelastic nonisothermal strain of the inner wall material with (usually) elastic behavior of the outer wall material. For reusable LRE, a cyclic sequence of the loading steps of the inner wall can lead to accumulating damages in its material because of the low-cycle fatigue and cause destruction of the wall or the loss of the cooling tract tightness. The main parameter that determines the level of low-cycle fatigue, is an absolute value of the accumulated inelastic strain (both plastic and evolving over time creep deformation). Quantitative evaluation of this parameter involves analysis of the inner wall loading with multiple starts and shutdowns of LRE. The paper represents an approximate analysis of such loading under certain simplifying assumptions using the approaches typical for mathematical modeling of structures under thermal stress.
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- 2016
20. Mathematical modeling of the deployment of a large transformable space structure
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V. N. Zimin, Z. Zikun, A. V. Krylov, and S. A Churilin
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Development (topology) ,Computer simulation ,Mathematical model ,Position (vector) ,Computer science ,Software deployment ,business.industry ,Frame (networking) ,Orbit (dynamics) ,Aerospace engineering ,business ,Actuator - Abstract
The prospects of the progress of radio astronomy, solar energy, as well as the exploration of the Earth surface and other planets from space are inherently linked to the possibility of deploying large structures (telescopes, antennas, energy platforms and so on) in space. These structures will be delivered to the space orbits in the densely-packed transport position. Then the process of deployment will bring them to the working position. Estimation of the orbital working capability of such transformable structures in the Earth conditions requires costly test rigs for making the structures weightless, as well as uniquely large vacuum chambers. The development of mathematical models of large transformable space structures that accurately describe their mechanical properties is especially important for designing and developing such structures. Therefore, a mathematical experiment using these models with identified parameters is very important for estimating the functional fitness of a large transformable structure being created. This paper considers a mathematical model of a multilink transformable structure that belongs to one of the simplest classes of space systems. Elements of such structures can be made of metal, as well as composite materials. The deployment of large transformable space structures can be done by force actuators: electric motors, springs, shape-memory material actuators. A mathematical model of the considered structure was built using MSC. Adams software, and numerical analysis of the deployment dynamics of a plane multilink closed foldable frame of a circular antenna with a diameter of 20 m was conducted. The results of the numerical simulation of the deployment process revealed a special feature of the deployment process: during motion, the frame elements may impact each other and the elements of the systems transporting these structures to the orbit.
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- 2019
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21. Mathematical model of transient heating of an anisotropic thermal insulation coating
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V. S. Zarubin, V. N. Zimin, and V. V. Leonov
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Materials science ,business.industry ,02 engineering and technology ,engineering.material ,Conductivity ,021001 nanoscience & nanotechnology ,01 natural sciences ,010305 fluids & plasmas ,Longitudinal direction ,Coating ,Thermal insulation ,0103 physical sciences ,Heat transfer ,engineering ,Transient (oscillation) ,Composite material ,0210 nano-technology ,Anisotropy ,business ,Layer (electronics) - Abstract
Thermal insulation coatings are applied to the heat transfer areas of structures exposed to intensive ambient heating to ensure the operability of the structures. If the heat transfer rate is non-uniform, the effectiveness of thermal insulation can be enhanced by using an anisotropic material that has a higher conductivity in the longitudinal direction parallel to the heat transfer surface compared to the conductivity in the direction of the normal to it. We present a mathematical model of the transient heating of a layer of such a coating. A quantitative analysis of the model allows estimating the influence of the anisotropy ratio on the leveling of temperature in the longitudinal direction and evaluating the possibility of reducing the ratio for the area where the heat transfer is maximum.Thermal insulation coatings are applied to the heat transfer areas of structures exposed to intensive ambient heating to ensure the operability of the structures. If the heat transfer rate is non-uniform, the effectiveness of thermal insulation can be enhanced by using an anisotropic material that has a higher conductivity in the longitudinal direction parallel to the heat transfer surface compared to the conductivity in the direction of the normal to it. We present a mathematical model of the transient heating of a layer of such a coating. A quantitative analysis of the model allows estimating the influence of the anisotropy ratio on the leveling of temperature in the longitudinal direction and evaluating the possibility of reducing the ratio for the area where the heat transfer is maximum.
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- 2019
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22. Simulation of the temperature state of the spacecraft shell in the shadow part of the orbit
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V. N. Zimin, I. Yu Savelyeva, and V. S. Zarubin
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Physics ,History ,Spacecraft ,business.industry ,Shadow ,Shell (structure) ,Astrophysics::Earth and Planetary Astrophysics ,State (functional analysis) ,Orbit (control theory) ,business ,Computer Science Applications ,Education ,Computational physics - Abstract
The thermal model describing the steady-state temperature state of the aluminized polymer spherical shell for the calibration spacecraft located in the shadow part of the Earth orbit is constructed. This model takes into account transfer of the thermal energy in the shell cavity by means of radiation and allows us to formulate the dependence of the temperature distribution over the shell surface on the spacecraft height above the Earth and on the radiation coefficients of the outer and inner surfaces of the shell. The quantitative analysis of the obtained dependence showed that when the mentioned radiation coefficients were increased, the temperature distribution would equalized over the shell surface. At the same time, the isothermal section of the shell with the lowest temperature located on the opposite from the Earth side of the shell was remained. When the spacecraft height above the Earth increases the area of isothermal section will increase, too, and a significant reduction of the average temperature will have place. This fact must be considered when estimating the availability of the used polymer material of the shell.
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- 2020
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23. Simulation of the shape deflection for the spherical shell of the space calibration-adjustment spacecraft
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V. N. Zimin, V. S. Zarubin, and G. N. Kuvyrkin
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History ,Materials science ,Optics ,Spacecraft ,business.industry ,Deflection (engineering) ,business ,Spherical shell ,Computer Science Applications ,Education - Abstract
The spherical shell made with high accuracy is one of the possible geometric shapes for passive orbital signal repeaters and calibration-adjustment spacecrafts used to determine the energy potential of the radar channel of the ground-based complex needed to control the space object motion. Under the solar radiation, an uneven temperature distribution over the surface of such a shell causing a deviation of its shape from the spherical one occurs. To determine these deviations, the steady-state temperature distribution for the shell with a fixed orientation relative to the Sun obtained by solving the Fredholm integral equation of the second kind is used. A quantitative analysis of the possible alignment of a quasi-stationary distribution of the shell temperature in case of the shell rotation with a constant angular velocity around the axis perpendicular to the direction to the Sun is carried out.
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- 2020
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24. Features of the Calculation Deployment Large Transformable Structures of Different Configurations
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V. N. Zimin, A. V. Krylov, V. E. Meshkovskii, A. N. Sdobnikov, F. R. Fayzullin, and S. A. Churilin
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lcsh:Computer engineering. Computer hardware ,Computer science ,Modeling language ,Process (computing) ,Mechanical engineering ,Reflector (antenna) ,lcsh:TK7885-7895 ,General Medicine ,kinematics of deployment ,Mechanical system ,Software deployment ,Position (vector) ,folding space antennas ,Orbit (dynamics) ,Antenna (radio) ,deployable space structures ,simulation of deployment of space structures ,lcsh:Mechanics of engineering. Applied mechanics ,lcsh:TA349-359 - Abstract
Despite the significant progress achieved in the design of space transformable structures to ensure a smooth and reliable deployment remains an important task. This type of construction can consist of dozens, hundreds or even thousands of interconnected elements. Deployment transformable space structures in orbit to test their performance in orbital conditions are associated with high material costs. Full deploy: experimental development process transformable structures involve a number of fundamental difficulties: It is impossible to eliminate the influence of gravity and resistance forces conditions. Thus, to calculate deploy of large transformable structures of various configurations is an important stage of their creation. Simulation provides an opportunity to analyze various schemes of deploy, to reveal their advantages and possible disadvantages. For numerical analysis of deploy of such structures is necessary to use modern software modeling of the dynamics of multi-component of mechanical systems such as EULER and Adams. Simulation of deployment space transformable structures was performed taking as example folding flat antenna contours diameter of 5 m and 20 m, foldable spatial calibration reflector diameter of 3 m, deployable antenna reflector truss-type aperture 3×6 m.The results of the calculations represent following characteristics: the time of adoption of the working position structures; form intermediate positions structures during deployment; dependence of opening angles and angular velocities of the design links on the time. The parameters of these calculations can be used as input in the development of structural elements providing deployment. They can also be used to prepare stands for experimental testing of disclosure designs in ground conditions. It should be noted that the theoretical models are the only way to analyze the deployment of such structures for possible emergency situations.
- Published
- 2014
25. Light radiation pressure upon a wrinkled membrane – parametrization of an optically orthotropic model
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N. A. Nerovny and V. N. Zimin
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History ,Membrane ,Materials science ,Radiation pressure ,Mechanics ,Orthotropic material ,Parametrization ,Computer Science Applications ,Education - Published
- 2018
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26. Safety and Efficacy of Multiple Drug Resistant Tuberculosis Treatment in Patients with Different HIV Statuses
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S. Yu. Degtyareva, V. N. Zimina, А. V. Pokrovskaya, and G. V. Volchenkov
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млу-туберкулез ,вич-инфекция ,нежелательные явления ,Diseases of the respiratory system ,RC705-779 - Abstract
The objective: to analyze and compare frequency and variety of adverse events (AEs) and their impact on outcomes of tuberculosis therapy when treating patients with multiple drug resistant tuberculosis (MDR TB) and different HIV statuses.Subjects and Methods: retrospective observational case-control study of patients registered for treatment with the 4th regimen of chemotherapy for tuberculosis in the city of Vladimir and Vladimir Region in 2014-2016.Results. The proportion of patients who reported any AE during the MDR TB treatment was similar among HIV positive and HIV negative patients and made 85.5%. In patients with concurrent HIV infection and MDR TB, hematopoietic AEs such as anemia, thrombocytopenia were more frequent, while neutropenia was significantly more frequent when comparing groups by the cumulative event probability method. Elevated eosinophil level during treatment was more typical of MDR TB patients. Treatment outcomes in the group of patients with HIV and MDR TB were statistically significantly worse due to the higher frequency of fatal outcomes. At the same time, there was no correlation of AE with unfavorable treatment outcomes. The early initiation of combination therapy with thorough monitoring of hematologic parameters in patients with HIV and MDR TB was safe and effective.
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- 2022
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27. Community-acquired pneumonia in HIV patients
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I. B. Viktorova, V. N. Zimina, I. V. Dadyka, I. V. Аndreeva, I. A. Golovina, and E. P. Chuzhikova
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вич-инфекция ,внебольничная пневмония ,иммуносупрессия ,Diseases of the respiratory system ,RC705-779 - Abstract
The objective: to study the frequency and nature of community-acquired pneumonia (CAP) in HIV patients.Subjects and methods: The continuous longitudinal retrospective study of all cases of respiratory diseases among HIV patients (n = 185), who received in-patient treatment in the therapy department.Results. CAP was diagnosed in 38.4% (n = 71) of patients and it was the most frequent respiratory disease among HIV patients. The median CD4 count in CAP made 197.5 cells/μL, 9.1% of patients received antiretroviral therapy before hospital admission. 74.7% of CAP patients (n = 53) had lesions disseminated to several lobes. Laboratory parameters revealed in severe CAP (leukocytosis > 12 × 109/L, leukopenia 0.05). Bacteremia in CAP was detected in 20.8% of patients and it was associated with the failure of standard empiric antibiotic therapy (p
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- 2021
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28. Delamanid is a new anti-tuberculosis drug: use, limitations, and prospects
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V. N. Zimina and I. B. Viktorova
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деламанид ,туберкулез ,лекарственная устойчивость микобактерий туберкулеза ,вич-инфекция ,Diseases of the respiratory system ,RC705-779 - Abstract
The review analyses 61 publications on the use of delamanid, a new drug for the treatment of drug resistant tuberculosis. It presents information about pharmacokinetic parameters, efficacy and safety, as well as the place of delamanid in the combination therapy of multiple drug resistant tuberculosis. It tells about specific parameters of delamanid use in children and HIV patients.
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- 2021
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29. Precision integrated pressure transducers
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N. A. Shelepin, D. V. Shabratov, N. Z. Salakhov, Yu. A. Chaplygin, and V. N. Zimin
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Planar ,Materials science ,Silicon ,chemistry ,Applied Mathematics ,Mechanical engineering ,chemistry.chemical_element ,Instrumentation ,Pressure sensor ,Metrology ,Compensation (engineering) - Abstract
The technology of manufacturing precision silicon integrated pressure transducers by the methods of traditional planar large-scale integration technology is considered. By employing an advanced construction and technology of the sensitive element and a temperature compensation circuit, a high acceptance ratio yield and good metrological characteristics are obtained.
- Published
- 1995
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30. Integrated beam strain gauges
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N. A. Shelepin, V. N. Zimin, and N. Z. Salakhov
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inorganic chemicals ,Materials science ,Silicon ,Applied Mathematics ,technology, industry, and agriculture ,chemistry.chemical_element ,Mechanical engineering ,equipment and supplies ,complex mixtures ,stomatognathic diseases ,Transducer ,chemistry ,Instrumentation ,Strain gauge ,Beam (structure) - Abstract
We consider the results of development of silicon strain-gauge transducers. We present the technical characteristics for different types of integrated silicon strain-gauge transducers.
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- 1994
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31. Respiratory diseases in HIV-infected patients (review)
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I. B. Viktorova, V. N. Zimina, S. Yu. Degtyareva, and A. V. Kravtchenko
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hiv-infection ,opportunistic infections ,tuberculosis ,pneumocystis pneumonia ,lymphoma ,Infectious and parasitic diseases ,RC109-216 - Abstract
The review presents information on epidemiology, clinical, laboratory and radiological manifestations of infectious and malignant respiratory diseases in HIV-infected patients.The data on the most common infections (communityacquired pneumonia, tuberculosis, Pneumocystis jiroveci pneumonia) and malignant diseases (Kaposhi’s sarcoma, lymphomas) as well as less frequent diseases (CMV-infection, MAC-infection, fungal pneumonias) are presented.The article contains facts about the incidence of pulmonary diseases according to the severity of HIV-associated immunodeficiency. This review also presents current information on the diagnostic criteria, treatment regimens and secondary prophylaxis for HIV-associated respiratory infections and malignancies. The specialties of ART initiation in definite cases of opportunistic infections and ART assignment during the diagnostic period are highlighted.The growing number of HIV-infected patients and the wide spectrum of possible pulmonary diseases argue the need for optimal clinical approach to HIV-infected patients with respiratory lesions for various physicians (general practitioners, pulmonologists and phthisiatricians).
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- 2020
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32. Clinical approach to lung diseases in HIV-infected patients (review)
- Author
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I. B. Viktorova, V. N. Zimina, S. Yu. Degtyareva, and A. V. Kravtchenko
- Subjects
hiv-infection ,opportunistic lung infections ,tuberculosis ,pneumocystis pneumonia ,Infectious and parasitic diseases ,RC109-216 - Abstract
The review presents literature data on therapeutic and diagnostic management of pulmonary diseases in HIV-infected patients. The article provides different practical approaches in the diagnosis of HIV-associated lung lesions and the spectrum of probable diseases, depending on the degree of immunodeficiency and the severity of clinical manifestations. The reference clinical signs of the most common opportunistic diseases with possible lung involvement are presented.The literature review highlights the feasibility of accurate etiological and invasive diagnosis of lung lesions in different clinical settings, as well as the need to designate various options of empirical antimicrobial therapy. The features of antimicrobial therapy and, in particular, the use of fluoroquinolones during the differential diagnosis of pulmonary lesions in HIV infection are discussed. The difficulties of verifying of HIV-associated lung diseases indicate the need of unified therapeutic and diagnostic approaches for use by various physicians (general practitioners, pulmonologists andphthisiologists).
- Published
- 2020
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33. The impact of substance abuse on the development of active tuberculosis in HIV positive patients depending on their CD4 count
- Author
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E. I. Kulаbukhovа, V. N. Ziminа, I. P. Chernovа, T. A. Murzаkovа, V. V. Belyaevа, and А. V. Krаvchenko
- Subjects
коинфекция вич-и/тб ,психоактивные вещества ,табакокурение ,хроническая алкогольная интоксикация ,хроническая наркотическая интоксикация ,Diseases of the respiratory system ,RC705-779 - Abstract
The objective of the study: to assess the risk to develop active tuberculosis in HIV infected patients with history of substance abuse taking into account their CD4 count.Subjects and methods. A retrospective case-control study was conducted with enrollment of 171 patients: HIV Group included 85 persons, while TB/HIV Group – 86 persons. For screening for chronic alcohol/narcotic intoxication, the CAGE questionnaire was used, and tobacco dependence was detected according to the criteria of World Health Organization. CD4 counts were obtained by the retrospective analysis of medical records. The impact of the studied risk factors on the development of tuberculosis was estimated by calculating the odds ratio with the calculation of the 95% confidence interval.Results. Statistically significant association with the development of active tuberculosis was obtained for all factors studied (tobacco smoking: OR = 8.7, 95% CI 3.6-21.6, p = 0.01; chronic alcohol and narcotic intoxication: OR = 3.5, 95% CI 1.8-6.5, p = 0.001 and OR = 2.5, 95% CI 1.1-5.4, p = 0.026, respectively). In the group of patients with CD4 count above 200 cells/µL, there was a confident effect of smoking and clinically significant substance abuse on the risk to develop active tuberculosis, and the power of their effect increased: for tobacco smoking OR = 12; 95% CI 1,5-98,7, p = 0.012; for drug abuse, OR = 4.8, 95% CI 1.7-13.4, p = 0.002. The tendency of chronic alcohol intoxication providing impact on the risk to develop tuberculosis in patients with CD4 count above 200 cells/μl persisted, but there was no statistically significant relationship in calculating the odds ratio OR = 3.1, 95% CI 3.1–9.6, p = 0.082. The obtained data allow considering people living with HIV and possessing history of substance abuse as a group facing the high risk to develop tuberculosis in need close follow-up aimed to prevent tuberculosis.
- Published
- 2019
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34. THE SAFETY OF TREATMENT OF MULTIPLE DRUG RESISTANT TUBERCULOSIS IN HIV POSITIVE PATIENTS RECEIVING ANTIRETROVIRAL THERAPY
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S. Yu. Degtyareva, E. N. Beloborodova, A. V. Pokrovskaya, Yu. A. Klimova, I. B. Viktorova, and V. N. Zimina
- Subjects
антиретровирусная терапия ,противотуберкулезная терапия ,коинфекция млу-тб/вич-инфекция ,нежелательные явления ,Diseases of the respiratory system ,RC705-779 - Abstract
The review analyzed the studies and meta-analyses devoted the treatment of multiple drug resistant tuberculosis in combination with antiretroviral therapy as a possible risk factor of adverse events and the worst outcomes of therapy. In total, the analysis included 18 sources from the Russian and English databases. Most of the studies did not reveal a confident relation between the simultaneous use of antiretroviral and anti-tuberculosis therapy with second line drugs and increased frequency of adverse events. At the same time, in the largest studies, as well as studies devoted to certain adverse events, the authors managed to prove the existence of such a connection. Data on the structure of adverse events also significantly differed in the results obtained by various authors. Most trials were conducted in African countries with a high prevalence of HIV infection.
- Published
- 2019
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35. Integrated pressure transducers for the normal range from 0.04 to 30 MPa
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Yu. A. Chaplygin, N. A. Shelepin, V. N. Zimin, and D. V. Shabratov
- Subjects
Transducer ,Materials science ,Applied Mathematics ,Acoustics ,Instrumentation ,Pressure sensor ,Strain gauge ,Normal range - Abstract
The development of measuring technique in the world has received a powerful stimulus in the past decade because of the development of the technology of integrated sensing elements. The use of integrated strain gauges in pressure transducers has made it possible to make them substantially smaller and less expensive while maintaining a high accuracy of measurement. Integrated transducers of various kinds are considered.
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- 1994
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36. Detection of Mycobacterium tuberculosis in sputum in patients coinfected with HIV / tuberculosis by various methods (literature review)
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I. B. Viktorova, S. Yu. Degtyareva, E. I. Kulabukhova, E. N. Beloborodova, and V. N. Zimina
- Subjects
co-infection hiv/tuberculosis ,diagnostics of tuberculosis ,smear microscopy ,molecular-genetic methods for the detection of mtb dna ,Infectious and parasitic diseases ,RC109-216 - Abstract
The review presents the special aspects of bacillary excretion in tuberculosis patients co-infected with HIV and the yield of acid-fast smear depending on the CD4-cell count. Predictors of positive growth of Mycobacterium tuberculosis from sputum under negative microscopy in this category of patients are considered. The experience of different countries of the world on the effectiveness of various diagnostic algorithms for detecting tuberculosis in HIV/TB co-infection and the role of molecular-genetic methods in the diagnosis of tuberculosis are discussed. According to the data presented in the review, the yield of acid-fast sputum smear microscopy varies significantly, and depends on a variety of factors, including the immune status of the patient with HIV infection, the level of the laboratory service. The different yield of the smear microscopy in combination with the subclinical course of tuberculosis and atypical radiologic presentation in patients with HIV infection leads to a delay in diagnosis and to late initiation of antituberculosis therapy. The culture and the molecular-genetic methods of sputum examination increase the frequency of detection of the pathogen, however, the diagnosis of tuberculosis by culture can not be considered rapid in patients with immunodeficiency. Therefore, in the context of the continuing increase in the number of patients with co-infection, rapid, molecular-genetic methods for the detection of MTB DNA should be included in the algorithm for screening for tuberculosis of HIV- infected patients during their first encounter with the healthcare system.
- Published
- 2018
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37. SPECIFIC COURSE OF PREGNANCY, PERINATAL OUTCOMES AND TREATMENT RESULTS IN HIV NEGATIVE FEMALE PATIENTS
- Author
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A. V. Nesterenko, V. N. Zimina, E. N. Beloborodova, and I. S. Brekhova
- Subjects
туберкулез ,противотуберкулезная терапия ,беременность ,новорожденные ,перинатальные исходы ,послеродовый период ,Diseases of the respiratory system ,RC705-779 - Abstract
The objective of the study is to investigate the specific course of pregnancy, perinatal outcomes and treatment results in HIV negative female patients.Subjects and Methods. Medical files of 109 pregnant tuberculosis patients were analyzed who were followed up in Krasnoyarsk Regional TB Dispensary no. 1 from 2010 to 2014.Results. The part of children prematurely born by mothers ill with tuberculosis was practically compatible with the overall national cohort of live-born children (6.8% in the analyzed group versus 5.7% in the national cohort for 2014). The part of children with congenital abnormalities born by mothers suffering from tuberculosis turned out to be twice lower versus the overall national cohort of live-born children (1.4% versus 3.0% in 2010 and 2.9% in 2014).The efficiency of the main treatment course in pregnant women without multiple drug resistant tuberculosis, of which 3.8 ± 0.3 months of tuberculosis treatment coincided with pregnancy was practically the same as treatment efficiency for the overall cohort of patients in Krasnoyarsky Kray (66.2% in the analyzed cohort versus 60.3-72.7% in the regional cohort for 2010-2014). In the pregnant with multiple drug resistant forms of tuberculosis, treatment efficiency was lower versus the regional cohort (30.4% in the analyzed cohort versus 41.1-60.2% in the regional cohort for 2010-2014).
- Published
- 2017
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38. CAUSES OF DEATH IN HIV-INFECTED PATIENTS IN A LARGE TUBERCULOSIS HOSPITAL OF KEMEROVO REGION
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I. B. Viktororva, A. L. Khanin, and V. N. Zimina
- Subjects
mortality ,hiv ,tuberculosis ,co-infection ,Infectious and parasitic diseases ,RC109-216 - Abstract
The aim was to study the causes of death in HIV patients in the Novokuznetsk tuberculosis dispensary in 2016 (population is 550 thousand people; about 2% of population are HIV-positive). Materials and methods: Protocols of all autopsies of HIV-infected patients (n=221) performed in 2016 in the Novokuznetsk tuberculosis dispensary. Results: The mean age of the deceased was 37Ѓ}6,9 years. HIV and tuberculosis (TB) co-infection was in 83,3% of patients (n=184), HIV/TB and other opportunistic or severe somatic diseases – in 10,4% (n=23), non-tuberculous opportunistic diseases – in 6,3% (n=14). The new tuberculosis cases were in 71,1% (n=147), relapses – in 7,2% (n=15), chronic tuberculosis cases – in 21,7% of patients (n=45). Disseminated form prevailed among the cases of respiratory tuberculosis; generalized tuberculosis (3 and more localizations) occurred in 87,0% (n=180), tuberculosis meningitis was found in 17,9% (n=37). Positive fluorescent sputum microscopy was in 72.5%, sputum cultures on Loewenstein-Jensen medium – in 78,3% with HIV/TB. Primary multidrug resistance was detected in 60,7% (including in 5,8% of them with primary extensively drug resistance). Severe opportunistic infections or malignancies were in 9,2% of HIV/TB (n=19) and in 78,7% of non-TB patients (n=11). Data on the CD4 level was known in 68,8% of cases (n=152): the median count was 75,5 cells/μl; 38,9% of new TB cases (n=46) were diagnosed with HIV in time of TB detecting. Antiretroviral therapy was performed only 13% of patients (n=29). Conclusion: There is a need for the optimization of HIV detecting approaches and early initiation of antiretroviral therapy before the appearance of incurable opportunistic diseases, as well as for comprehensive TB prevention.
- Published
- 2017
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39. DETECTION OF TUBERCULOUS MYCOBACTERIA IN SPUTUM AND INTENSITY OF BACILLARY EXCRETION IN TUBERCULOSIS PATIENTS WITH VARIOUS HIV STATUS
- Author
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V. N. Ziminа, O. E. Mikovа, T. A. Vаretskаya, S. Yu. Degtyarevа, and V. I. Sergevnin
- Subjects
туберкулез ,коинфекция ,вич-инфекция ,массивность бактериовыделения ,информативность выявления мбт ,Diseases of the respiratory system ,RC705-779 - Abstract
Goal of the study: to investigate the informativeness of tuberculous mycobacteria detection by various techniques and to analyze the intensity of bacillary excretion in tuberculosis patients depending on their HIV status.Materials and methods. 360 HIV patients were examined due to suspected tuberculosis. The diagnostic procedure included two consecutive sputum test for acid fast bacilli (AFB)/tuberculous mycobacteria by fluorescent microscopy, molecular genetic tests and culture on liquid and solid media. Tuberculosis was diagnosed in 178 (49.4%) patients. The comparison group included 354 tuberculosis patients with negative HIV status including 113 patients who underwent the same diagnostic procedure as those suffering from TB/HIV co-infection.Results of the study. AFB were more often detected by fluorescent microscopy in HIV negative tuberculosis patients compared to those with TB/HIV co-infection (32.8 and 24.2% respectively), and the sensitivity of the other testing methods did not differ. Scarce bacillary excretion was confidently more often registered in those suffering from TB/HIV co-infection and less frequently they had massive bacillary excretion detected by culture on solid media compared to HIV negative tuberculosis patients. The complete diagnostic procedure demonstrated better sensitivity in those with TB/HIV co-infection compared to tuberculosis patients with negative HIV status (87.1 and 71.2%).
- Published
- 2017
- Full Text
- View/download PDF
40. Features of the course and effectiveness of treatment of tuberculosis in pregnant women with different HIV status
- Author
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A. V. Nesterenko and V. N. Zimina
- Subjects
tuberculosis ,pregnancy ,co-infection (hiv/tb) ,Infectious and parasitic diseases ,RC109-216 - Abstract
The study presents the results of comparing the social status and the efficiency of TB treatment in pregnant women with or without HIV treated in Krasnoyarsk Regional TB Clinic № 1 in the years 2010–2014. It is based on a retrospective analysis of health cards of 133 pregnant TB patients divided into groups: Group 1 (TB), n=109; Group 2 (TB and HIV), n=24. More than a half of the women (51,3% and 54,1% accordingly) were new TB patients, the others had been previously treated for TB. A moderate immunodeficiency was more often detected in co-infected pregnant women (mean CD4+ lymphocyte count being 387 cells/ml), although in 4 patients the CD4 count was lower than 200 cells/ml. The registered rates of bacterioexcretion and lung disintegration were practically the same (57,7% and 58,3% versus 53,2% and 54,1% accordingly); MDR TB was diagnosed in 51,1% in Group 1 and in 60,0% in Group 2.Results: Patients of both groups had various social problems. However, the most aggravating medico-social factor among the co-infected women was active drug abuse during pregnancy (proved in 37,5%). The clinical course of TB in patients with HIV was severer, they more often developed acute forms of the disease. Preterm delivery was more frequent in TB/HIV cases (46,1% vs. 12,3%, p
- Published
- 2017
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41. DETECTION OF MYCOBACTERIUM TUBERCULOSIS IN BLOOD FOR DIAGNOSIS OF GENERALISED TUBERCULOSIS IN HIV-POSITIVE PATIENTS
- Author
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V. N. Zimina, O. E. Mikova, T. A. Varetskaya, D. A. Oborin, A. G. Zemskov, and S. Yu. Degtyareva
- Subjects
hiv-infection ,tuberculosis ,mycobacterial bacteremia ,tuberculous sepsis ,mbt-bacteremia ,blood culture ,bloodstream infection. ,Infectious and parasitic diseases ,RC109-216 - Abstract
Objective: To study the informative value of the detection of mycobacteria in blood with the cultural method in patients with suspected tuberculous sepsis and to determine the most significant clinical and laboratory criteria for testing. Materials and methods: The investigation to detect M.tuberculosis was fulfilled in 159 HIV-positive patients with suspected tuberculosis sepsis. Blood culture was completed with culture medium Myco/F Lytic Culture Vials and analyzer BACTEC 9050. Results: Mycobacteria were detected in blood of 19 patients (11,9% of all patients): in 18 patients the growth of М. tuberculosis complex was detected (25,3% of all patients with diagnosed tuberculosis) and in 1 patient it was Mycobacterium avium complex (0,6% of all patients). It was shown, that the probability of M.tuberculosis detection was especially associated with the severity of the disease, immunosupression (less than 100 cells/mkl), hemoglobin quantity less than 90 g/l (levels were determined through the seeking for the most significant cutoffs). It was not proofed, that meningoencephalitis develops more often in patients with proven bacteremia. There were no evident differences in detection frequency of mycobacteria in sputum between patients with tuberculous sepsis and without it.
- Published
- 2017
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42. USING GENETIC MARKERS FOR PREDICTION OF ACTIVE TUBERCULOSIS IN HIV PATIENTS
- Author
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E. I. Kulabukhova, K. O. Mironov, E. A. Dunaeva, A. V. Kravchenko, V. N. Zimina, and D. E. Kireev
- Subjects
Diseases of the respiratory system ,RC705-779 - Published
- 2018
- Full Text
- View/download PDF
43. CLINICAL COURSE OF HIV-ASSOCIATED TUBERCULOSIS IN THE PREGNANT WOMAN AND NEWBORN
- Author
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A. V. Nesterenko, V. N. Zimina, N. M. Koretskaya, and N. V. Kozyrina
- Subjects
туберкулез ,вич-инфекция ,беременность ,Diseases of the respiratory system ,RC705-779 - Abstract
The article describes the clinical case of TB/HIV coinfection in the pregnant woman and newborn. The discussion of the management tactics included main issues on which treatment success depended on: the right choice of chemotherapy regimen, correct decision on the time of delivery due to life-threatening conditions of the mother, timely diagnostics of tuberculosis in the newborn. It is necessary to develop cross-disciplinary guidelines by professional medical communities on the management of pregnant women with TB/HIV coinfection which will allow enhancing the quality of medical care to pregnant women and newborns at all stages of follow-up.
- Published
- 2016
- Full Text
- View/download PDF
44. DETECTION OF TUBERCULOUS MYCOBACTERIA IN THE BLOOD OF PATIENTS WHEN SUSPECTING TUBERCULOUS SEPSIS
- Author
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V. N. Zimina, O. E. Mikova, D. A. Oborin, S. Yu. Degtyareva, and I. B. Viktorova
- Subjects
микобактерии в крови больных вич-инфекцией ,бактериемия при туберкулезе ,туберкулезный сепсис ,Diseases of the respiratory system ,RC705-779 - Abstract
The increase in HIV patients manifesting clinical signs of sepsis requires up-to-date, rapid and reliable techniques for etiologic diagnostics.The analysis has included 53 publications related to various aspects of tuberculous bacteriemia, resources for its detection and their efficiency. According to the publications tuberculous mycobacteria in blood can be detected in HIV-positive patients with severe immune suppression (CD4: 17-18 cells/mcl) and presence of the following clinical and laboratory and X-ray signs: fever, severe anemia, paratracheal lymphoadenopathy, miliary dissemination. It is feasible to test the blood in order to detect tuberculous mycobacteria only in the very ill HIV positive patients in whom tuberculosis is suspected and it is impossible to collect sputum and there are no obvious signs of pulmonary lesions.The presence oftuberculous mycobacteria in blood isrelated to the high mortality level (up to 60%) and the immediate prescription of anti-tuberculosis therapy can reduce it. Antiretroviral therapy can reduce the chances of tuberculous sepsis development. Development and optimization of test systems for rapid detection of DNA of tuberculous mycobacteria in blood can be fairly promising for the diagnostics of the urgent tuberculosis.
- Published
- 2016
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45. A case of tuberculosis in HIV-infected pregnant women
- Author
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A. V. Nesterenko, V. N. Zimina, and I. S. Brekhovа
- Subjects
tuberculosis ,pregnancy ,hiv infection ,Infectious and parasitic diseases ,RC109-216 - Abstract
Here is presented the clinical surveillance of course coinfection (and HIV / TB) process of a pregnant woman. In a retrospective discussion of medical tactics marked the main points of contention in the conduct of pregnant women with coinfection (HIV / TB), an analysis of the adequacy and the need for X-ray examination of the patient, the effectiveness of the treatment process coinfection process. The case demonstrates the ability of HIV-infected effectively treat tuberculosis and healthy baby female patient with active tuberculosis with timely and adequate combination therapy (antiretroviral and anti-tuberculosis).
- Published
- 2016
46. CO-INFECTION (HIV/TUBERCULOSIS) IN PREGNANT WOMEN
- Author
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I. B. Viktorova, A. V. Nesterenko, and V. N. Zimina
- Subjects
беременность ,туберкулез ,вич-инфекция ,коинфекция ,врожденный туберкулез ,Diseases of the respiratory system ,RC705-779 - Abstract
The literature review describes the current state of the problem of the co-infection (HIV infection/tuberculosis) in pregnant women. Certain questions of tuberculosis detection and diagnostics in pregnant HIV-infected women were discussed. Approaches to treatment of drug susceptible and drug resistant tuberculosis in pregnant HIV-infected women were described with the reference to potential drug interaction. The literature review included the part devoted to specific diagnostics of congenital tuberculosis in children born by mothers with the co-infection. The need of further investigation of the actual issues of HIV/tuberculosis co-infection in the pregnant was highlighted.
- Published
- 2015
47. Risk analysis for post-surgical complications in tuberculosis spondylitis patients with concurrent HIV infection
- Author
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E. V. Reshetneva, A. Yu. Mushkin, and V. N. Zimina
- Subjects
туберкулезный спондилит ,хирургическое лечение ,осложнения ,вич-инфекция ,Diseases of the respiratory system ,RC705-779 - Abstract
The article presents the analysis of immediate and postponed outcomes of surgical treatment of tuberculosis spondylitis in HIV-infected patients; the relative risks of post-surgery complications have been estimated.
- Published
- 2015
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48. Correlation between the morphological signs of tuberculosis and the immune status in HIV infection
- Author
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Yu. R. Zyuzya, V. N. Zimina, Yu. G. Parkhomenko, M. V. Alvares Figeroa, and E. A. Dolgova
- Subjects
вич-инфекция ,туберкулез ,патологическая анатомия ,иммуносупрессия ,Diseases of the respiratory system ,RC705-779 - Abstract
Comprehensive morphological examination of surgical and biopsy samples from 148 patients and autopsy specimens from 181 deceased persons was made to determine a correlation between the level of immunosuppression and the microscopic signs of tuberculosis in patients with HIV-associated tuberculosis (HIV/TB). A relation was found between the count of CD4+ lymphocytes and the predominant type of a tissue inflammatory reaction. Insidious granulomatous inflammation and a preponderance of alterative and exudative components in the foci of tuberculous inflammation suggested that a delayed-type hypersensitivity response that was typical of tuberculosis gave way to an immediate-type hypersensitivity response and reflected severe immune system dysfunction. The lack of responsiveness of the macroorganism in the virtually complete absence of CD4+ lymphocytes observed during autopsy examination led to the acute progression and generalization of tuberculosis, by affecting all organs and systems.
- Published
- 2014
49. DIAGNOSIS OF TUBERCULOSIS IN HIV-INFECTED PATIENTS
- Author
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V. N. Zimina, I. A. Vasilyeva, A. V. Kravchenko, Yu. R. Zyuzya, and A. G. Samoilva
- Subjects
Diseases of the respiratory system ,RC705-779 - Abstract
На фоне ВИЧ-ассоциированной иммуносупрессии диагностика туберкулеза представляет значительные трудности. По данным 2010 г., в Российской Федерации в структуре вторичных заболеваний у больных ВИЧ-инфекцией туберкулез составил 39% (по данным МЗ РФ, ф. 61) и лидировал среди причин смерти людей, живущих с ВИЧ (ЛЖВ), умерших от причин, связанных с ВИЧ-инфекцией (63,4% в 2010 г. по данным МЗ РФ, ф. 61). Следовательно, у лихорадящего пациента с ВИЧ-инфекцией фтизиатрическая настороженность врача любой специальности должна быть приоритетной в диагностическом поиске. Вместе с тем более чем у половины больных на поздних стадиях ВИЧ-инфекции клиническая симптоматика связана с другими вторичными заболеваниями, что значительно осложняет проведение дифференциальной диагностики туберкулеза у этих больных. Анализируя ошибки, допущенные врачами общей лечебной сети при диагностике диссеминированного туберкулеза легких на поздних стадиях ВИЧ-инфекции, И. Ю. Бабаева показала, что большинству пациентов был поставлен диагноз внебольничной пневмонии [3]. В результате анализа летальных исходов среди взрослых больных ВИЧ-инфекцией г. Москвы определено, что частота клинически не распознанных вторичных заболеваний (основным из которых был туберкулез) у пациентов, проходивших лечение в неспециализированных клиниках, составляла до 50% [26].
- Published
- 2014
- Full Text
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50. IMPACT OF TUBERCULOSIS ON THE COURSE OF PREGNANCY, DELIVERY AND PERINATAL OUTCOMES
- Author
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А. V. Nesterenko, V. N. Zimina, and S. I. Kayukova
- Subjects
Diseases of the respiratory system ,RC705-779 - Published
- 2018
- Full Text
- View/download PDF
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