A. A. Skvortsov

A. A. Skvortsov
Moscow Polytechnic University

Prof.

About

118
Publications
4,827
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420
Citations
Citations since 2017
51 Research Items
274 Citations
20172018201920202021202220230204060
20172018201920202021202220230204060
20172018201920202021202220230204060
20172018201920202021202220230204060
Introduction
Additional affiliations
October 2014 - present
Moscow Polytechnic University
Position
  • Head of Department

Publications

Publications (118)
Chapter
The development of an algorithm for studying the functioning of a thermal memory cell (TCC) was based on the selection of the minimum sufficient time intervals between heating and the start of heating to maintain the temperature corresponding to the temperature of the logical “1”, as well as determining the required heating frequency at which overh...
Article
The work considers the processes of formation of aluminium melt drops, dispersion of aluminium melts and dynamics along the surface of the semiconductor during the electrical explosion of the metal film. It has been shown that in conditions of flow of rectangular high-density current pulses (amplitude j max =2· 10 ¹¹ A/m ² and duration up to 2.0 ms...
Article
Full-text available
The article considers the issue of an attempt to experimentally study the effect of constant magnetic fields on the processes of plastic deformation of aluminum alloys. An analysis of the influence of a magnetic field on the creep of an Al alloy with iron inclusions is presented. Estimates of the supposed mechanisms of the influence of the magnetic...
Article
Full-text available
Currently, various non-metallic materials are widely used in industry, including composite ones, which have a number of positive properties. The practice of operating products from these materials allows us to conclude that many of these are characterized by a brittle nature of destruction. Moreover, numerous experimental studies have established t...
Article
Full-text available
This article is devoted to the effect of a magnetic field of 0.7 T on the state of an aluminum alloy whose creep increases after exposing to a magnetic field, exhibiting a “magnetic memory.” The alloy contains FeAl microinclusions identified by electron microscopy, magnetometry, and Mössbauer spectroscopy. Possible mechanisms of changing the states...
Article
It is well known that a nonhomogeneous state of stress occurs in compounds of dissimilar materials upon heating. Uon the assessment of the strength of the joints, it is necessary to factor in the physical specifications of the soldered elements, the geometric dimensions and temperature conditions of their operation. The purpose of the research was...
Article
The problems of molten zones formation and their subsequent migration over material surface are of interest from the viewpoint of developing novel technological methods of forming microelectronic structures. Such drops can be used as primary working elements of microlenses and reflectors, displays, weighers. The aim of this work was experimental st...
Article
The article presents data on experiments related to the start-up process of an automobile engine using capacitive energy storage. It is shown that capacitive energy storage devices can be used for efficient start-up of an internal combustion engine. The aim of the article was to study the systems of electric start of vehicles combustion with capaci...
Article
The relevance of the study is due to the fact that in the conditions of development of micro-and nanoelectronics, it is necessary to pay attention to resistive switching systems, which are the basis in the structures of these areas of electronics. The work deals with the investigation of the role of thin dielectric layers of silicon oxide and nitri...
Article
A deformable bimorphic mirror with a high density of 37 electrodes and a diameter of 15 mm was fabricated to allow correction of small-scale wavefront aberrations. Laser-engraving technology was used to form a grid for the control electrodes. Wires were attached to the surfaces of the electrodes via ultrasonic welding.
Article
The physical origin of the magnetoplastic effect was experimentally identified in Al polycrystalline alloy. Exposure of the nominally pure industrial Al-Mg-Si-Fe alloy to magnetic field 0.7 T induces residual changes that provide a creep rate increase up to 25% and microhardness decrease down to 30%. FeAl inclusions of ∼1 μm size were revealed in t...
Article
Arguments are made in favor of the use of transporters intended for transporting large-sized indivisible heavy objects, which are composed of separate self-propelled modules. The basic principles of operating such a loosely coupled vehicle using modern information technologies are given in the context of steering control. Some versions of transport...
Article
The purpose of this manuscript is to develop an algorithm for scheduling tasks for a delta robot, working as part of a moving conveyor belt, when sorting solid household waste. Different approaches to the optimization of the trajectories of movement are considered taking into account the design features of the developed complex. The manuscript pref...
Article
Full-text available
The aim of the work is to study the algorithmic solutions of non-invasive medical remote monitoring of human health based on the wearable biosensor platform in the mode of everyday wear. The relevance of the topic is due to the need to improve the quality and reduce the cost of medical services provided to the population due to the release of medic...
Article
The paper is devoted to the study of the process of optimizing the semiconductor strain-gauge transducer on the structure of the SOS. As an object of the study, an elastic membrane-type element with a semiconductor strain-gauge in the form of a silicon-on-sapphire structure was used. To study the surface of sapphire, the optical photolithography me...
Article
Under the influence of a constant magnetic field, there is a deformation of solid particles. These processes in the future lead to destruction. Therefore, the authors investigated these processes in more detail. When studying the creep of the samples, a lever-type machine was used. During the measurements (at room temperature) simultaneously with t...
Article
Purpose This study aims to examine the electromigration processes resulting from thermal overloads of semiconductor devices. While in operation, parts of such devices can heat up to 330°C for a short period, resulting in the emergence of molten zones and the devices’ inevitable degradation. Therefore, this study examines the mechanisms behind the...
Article
The work is devoted to the study of contact melting in the Al-Si system, which is an aluminum film deposited on a silicon single-crystal substrate. The impulse action of high-density currents (j> 8.1010 A / m2) passing through an aluminum film is analyzed. It was found that under the considered electric heat loads in the system, the degradation pro...
Article
The work is devoted to the study of defect formation processes in the near-surface layers of silicon under thermal shock conditions and to the effect of preliminary exposure in a constant magnetic field on this process. As a result of investigations it was established that dislocation half-loops near the local heat source are formed in the near-sur...
Article
The effect of constant magnetic fields on the formation and dynamics of molten Al–Si inclusions in silicon in the field of structural inhomogeneity of a crystal (the dislocation density-gradient field) is considered. The migration rates of liquid inclusions in crystals have been found experimentally under conditions of prevailing melting–crystalliz...
Article
Titanium nickelide is similar to titanium alloys by its chemical properties, since its interaction with other substances, in particular its corrosion properties, determines titanium dioxide formed on the metal surface. These metals are used in various industries. Therefore, the main purpose of the work is to determine the characteristics of manufac...
Article
The purpose of this work is to develop an algorithm for recognizing the shape of objects that are resistant to various interferences: rotation, deformation, overlapping and connectedness of objects. Based on the presented algorithm, the software will be developed for a computer vision system designed to work as part of a robotic sorting complex. Th...
Article
With the development of computing technology, it became possible to solve a number of problems arising in the course of life, to facilitate, accelerate, improve the quality of the result. The purpose of this work is to study the spectral densities of the reflected signals in the near infrared zone and to develop a system for recognizing types of ma...
Article
Full-text available
Currently, electromechanical systems are widely used in technology. An important role is played by microsensors for measuring the values of physical parameters and converting them into electrical signals. The aim of the study is to determine the limits of applicability of analytical and numerical methods for calculating mechanical stresses and defl...
Article
The principles of selection and creation of rational methods of disposal and recycling of wastes are based on the fact that the problem of waste is an interconnected environmental-economic and technological problem, and the waste itself should be considered as technogenic raw materials of complex organo-mineral composition. Therefore, the main purp...
Article
This work is aimed at studying the kinematic schemes of robot manipulators in order to determine the optimal solution to use as a universal sorting complex when performing manipulations with objects moving on a conveyor belt. The paper presents a description and an analytical solution of the inverse kinematic problem for the Delta robot. The kinema...
Article
This paper is aimed at studying optical systems for the recognition of material types and forms when sorting objects moving along a conveyor belt. The methods for identifying the object material, as well as the algorithms for isolating and recognizing objects through processing data from the machine vision system are considered. It is shown that fo...
Article
The substances move in conductors owing to drift of ions that occurs due to momentum exchange at collisions between the conductive carriers and atomic lattice. This effect is substantial at high-density direct currents, e.g., in power electronics. Therefore, the assigned subject matter is topical. The aim of this work is investigation of the effect...
Article
Full-text available
The study is devoted to the study of the mechanical properties of penodiatomite ceramics. Dynamics of changes in the dynamic moduli of elasticity of highly porous (up to 70%) diatomite ceramics from the annealing time at temperatures of 800-1000 °С has been experimentally studied. The values of the activation energies of the change in the modulus o...
Article
The paper is devoted to the study of the magnetostimulated dynamics of dislocations in silicon and the influence of electric current on this process. As a result of the conducted studies, it was found that preliminary exposure of n-and p-type silicon single crystals in a constant magnetic field (B = 1 T, exposure time up to 30 minutes) leads to an...
Article
The necessity and urgency of studying plastic deformation of metals is determined by both scientific significance of the problem and requirements of practice. So the objective of this work is investigation of aluminum alloy creep under action of static magnetic fields. This subject matter is of practical importance for engineering since the parts o...
Article
This article is aimed at developing software solution for trajectory planning in the field of creating a universal robot designed to perform various simple tasks, with the purpose of replacing human labor, in a remote and autonomous mode. The article describes the application of the MoveIt! package and the OMPL framework for planning the trajectory...
Article
The formation and dynamics of molten Al–Si inclusions in silicon at temperatures of 1123–1273 K in the dislocation-density gradient field are investigated. It is established that the molten inclusion moves as a whole in accordance with the melting–crystallization mechanism: dissolution is observed at the front boundary in the region with a higher d...
Chapter
Full-text available
The experiments were performed in a vacuum chamber for silicon (n-type, resistivity of 10 Ω∙cm) specimens that were previously cut into 4 × 4 × 15 mm blocks (Figure 2). After lapping with M-15 micropowder and with ACM-5 diamond paste, the specimens were treated with ethanol and then were clamped between two tantalum electrodes by the procedure desc...
Article
Full-text available
The article introduces the analysis of thermal degradation mechanisms related to the heating and melting of metallization system, as well as the contact fusion in transient conditions, and carries out an investigation of the thermal damage of metallization systems under the influence of current pulses. The method of pulse impact on the structure of...
Article
This article is aimed at developing software and hardware solutions in the field of creating a universal robot designed to perform various simple tasks, with the purpose of replacing human labor, in a remote and autonomous mode. The article presents an approach to the development of a robot arm control system - a 7-axis collaborative anthropomorphi...
Article
Full-text available
Background/Objectives: The objective of this study is to develop constructive and firmware solutions to create universal robot that would perform different simple tasks and replace human labor in remote autonomous operations. Methods: Specific features of the suggested learning method are represented by the possibilities to copy and exchange skills...
Article
Full-text available
The paper offers analysis of existing starting systems of combustion engines, including ones using low-voltage energy storage units. It also grounds transition of combustion engines' starting systems to higher voltage with use of high-voltage accumulators.
Article
Background/Objectives: The objective of this study is to develop constructive and firmware solutions to create universal robot that would perform different simple tasks and replace human labor in remote autonomous operations. Methods: Specific features of the suggested learning method are represented by the possibilities to copy and exchange skills...
Article
Background/Objectives: This research deals with alternative systems of distributed tactile systems for robotic appliances. Methods: The electric conductor disruption method and the electrolytic separation method were used to manufacture the prototype sensor elements. Numerous experiments were conducted to study various properties of sensory element...
Article
Background/Objectives: This article deals with the experimental research of the newly developed anthropomorphic manipulator for gripping items out of the predetermined set. The project aims at developing an anthropomorphic gripping manipulator to a high accuracy of copying dynamics and kinematics of a human hand. Methods: Application of method of p...
Article
Background/Objectives: The objective of this study is to select the lines of research for implementing constructive and firmware solutions to create universal robot that would perform different simple tasks. Methods: Such technical solutions will be used for further development of different types of robots of either anthropomorphic or of any other...
Conference Paper
The paper discusses electromigration of molten zones on the surface of the semiconductor in the framework of the mechanism of melting of crystallization. Analyzed experimental data electromigration processes on the surface of monocrystalline silicon wafer after passing a current pulse through the aluminum film with energy up to 250 mJ with a durati...
Conference Paper
The paper considers the issues of burning metal jumpers on the surface of a semiconductor by current pulses of different shapes. Discovered that the passage of single rectangular current pulse with a duration of no more than 60 μs and an energy of 90 mJ observed the predominance of the processes of melting metal film over the contact melting at the...
Article
Purpose The purpose of this study is to investigate the mechanisms of degradation of aluminum metallization under conditions of thermal shock caused by rectangular current pulses (amplitude j < 8 × 10 ¹⁰ A/m ² , duration t < 800 μs). Design/methodology/approach The results were obtained using oscillography and optical microscopy and through the co...
Article
We study the degradation of aluminum metallization under the thermal impact induced by rectangular current pulses with an amplitude of j < 8 × 1010 A/m2 and a length of τ < 800 μs and experimentally investigate the thermal degradation of a metal film under the action of phase transformations, specifically, metal fusion and contact melting in a meta...
Article
Full-text available
The article is a study into the kinematic scheme of a newly developed anthropomorphic manipulator designed to perform gripping and holding tasks on items from a predefined set. Within the study is the implementation of a mathematical model describing the kinematics of a multilink manipulator using the GraspIt package. The method used in this study...
Article
We studied formation and dynamics of melt inclusions in silicon single crystals at direct and pulse current flowing. It is ascertained that a general regularity of migration of impurity regions in Si is simultaneous precipitation of matrix atoms from a melt drop and their dissolution in it under the action of both Peltier heat localized at interpha...
Article
Full-text available
The results of analysis and study the kinematic model of the anthropomorphic arm with 22 degrees of freedom are given. Describes how to use the package GraspIt! virtual simulation and experimental study of the grasping efficiency of various items. Applications submitted technique enables to compare different versions of kinematic schemes of manipul...
Article
Full-text available
The object of the article is the study of implementation methods for the development of hardware-software engineering solutions in the field of the creation of a universal anthropomorphic gripper. Such technical solutions are intended to enable the adaptation and extensive use of advanced robotic systems in the natural environmental conditions form...
Article
Full-text available
The effect of constant magnetic fields on dislocation anharmonicity of p-type silicon single crystals with a conductivity of 6 Ω cm has been studied. It has been found that preliminary exposure of dislocation silicon (with a dislocation density of 104–106 cm−2) to a constant magnetic field (B = 0.7 T, t = 30 min) at room temperature causes a change...
Article
The results of analysis and study the kinematic model of the anthropomorphic arm with 22 degrees of freedom are given. Describes how to use the package GraspIt! virtual simulation and experimental study of the grasping efficiency of various items. Applications submitted technique enables to compare different versions of kinematic schemes of manipul...
Article
Phase transitions of the first sort in aluminum metallization when passing through it single rectangular impulses of current with an amplitude up to 8.1010 A/m2 and lasting 100-1000 μs are considered. Processes of formation of the local melted-off zones, and also their subsequent migration in the course of current course are experimentally studied....
Article
In work degradation of systems of metallization on the basis of aluminum is considered at influence of impulses of current triangular and squared. It is revealed that the degradatsionny processes connected about formation of melted zones are registered an oscillographic method. Comparison the degradatsionnykh of processes in systems of metallizatio...
Article
Full-text available
First-order phase transitions induced in aluminum metallization layers by the passage of single rectangular current pulses with amplitude up to 8 x 10(10) A/m(2) and durations within 100-1000 mu s are considered. The formation of local fused zones and their subsequent migration during current passage have been experimentally studied. The main mecha...
Article
Full-text available
The effect of static magnetic fields on the dynamics of surface dislocation segments, as well as the diffusion mobility of a dopant in silicon single crystals, has been analyzed. It has been experimentally found that the preliminary treatment of p-type silicon plates (the dopant is boron with a concentration of 10{sup 16} cm{sup -3}) in the static...
Article
Full-text available
A mathematical model of thermal operational modes of the metal-semiconductor contact pair is constructed based on the analysis of the temperature fields in a semiconductor wafer with a surface heat source in a form of the metallization layer. The influence of current pulses with an amplitude j < 5 × 1010 A/m2 and duration of 100–1000 μs both on the...
Article
Full-text available
A variation has been revealed in electron paramagnetic resonance spectra of single-crystal silicon Cz-Si plates plastically deformed by bending and torsion. The plastic deformation of the silicon plates is accompanied by the introduction of dislocations (∼107 cm−2) and leads to the appearance of new lines in the electron paramagnetic resonance spec...
Article
Full-text available
The formation and electromigration of melted aluminum-silicon (Al-Si) inclusions in single-crystalline silicon and polycrystalline aluminum has been studied. It is established that, in a temperature interval of T = 850-920 K, the contact melting in the Al-Si system is accompanied by the formation of melted zones (inclusions) with dimensions within...
Article
Full-text available
Features of thermal degradation of the aluminum metallization layers deposited onto the silicon surface with dielectric steps have been studied during the passage of single rectangular electric pulses with a current density amplitude of j 10 A/m2 and a duration of 100–1000 μs. An approach to the diagnostics of metallization in the presence of diele...
Article
Full-text available
The effect of static magnetic fields up to 1 T on the state of impurity point defects and the mobility of surface dislocation segments in doped (0.01–1.00 Ω cm) silicon has been considered. Long-lived (∼100 h) changes in the state of point defects have been revealed from the mobility of dislocations introduced after the magnetic-field treatment. Th...
Article
Full-text available
Features of the contact melting in thin-film structures comprising an aluminum layer with a thickness of h 1 = 5 μm and a metal (Ti, Ni, Mo) or semiconductor (Si, Ge) sublayer (h 2 = 0.1 μm) on a single crystal silicon plate (h 3 = 500 μm) have been studied. The contact melting was caused by single rectangular electric pulses with a current density...
Article
The main results of investigations into the mechanical properties (including the dislocation structure) of single-crystal silicon upon indentation in water in an electrical field are presented. It is revealed that the space-charge region plays a key role in changing the scratch (scribe) width and the maximum path of dislocations in chosen slip band...
Article
The mechanism of relaxation of stresses through the multiplication and motion of dislocations in the vicinity of a stress concentrator (scribe) in silicon single crystals is investigated. The energy-related and dynamic characteristics of the observed processes are determined for different angles of orientation of stress concentrators with respect t...
Article
We have studied the electromigration (j = 5.7 × 105 A/m2) of Ag-Te melt inclusions in single-crystal tellurium at an axial temperature gradient dT/dx = 1.5 × 103 K/m. The results indicate that the movement of the inclusions is governed by the temperature gradient vector and that the penetration depth is larger in the single crystal in contact with...
Article
The effect of thermomagnetic treatment on the amplitude dependence of internal friction of magnetically soft Fe-Cr alloys and graphitized steels is investigated. The laws of variation of parameters of internal friction after thermomagnetic treatment of iron alloys with ferritic structure are determined. The effect of four structural characteristics...
Article
The temperature regimes of operation of an aluminum metallization layer on a silicon plate have been analyzed for the passage of an electric pulse with a current density buildup rate of Δj/Δt ≤ 1.5 1014 A/(m2 s). The temperature dynamics in this system has been calculated and compared to the experimental results. Degradation processes in the metall...
Article
The thermal conditions created in an aluminum metallization layer on a silicon wafer by a rectangular current pulse are analyzed at pulse heights of up to 6 1010 A/m2 and pulse durations from 50 to 103 μs. The thermoelastic stress developing in silicon substrates as a result of unsteady-state heating of the metallization layer is calculated. The th...
Article
Thermal conditions in an aluminum metallization stripe deposited onto a single crystal silicon substrate have been studied during the passage of single rectangular electric pulse with a current density of j 10 A/m2 and a duration of τ = 100–1000 μs. Based on the results of this analysis, a method of diagnostics of the state of metallization contact...
Article
The distribution of defects in dislocation tracks in silicon plates was studied for various indentation angles. The regularities of variations in the linear density and maximum path of dislocations in slip bands are established. A model is proposed to describe the distribution of dislocations in the dislocation tracks. By fitting the theory to the...
Article
Electromigration of molten tin-based inclusions in single-crystal p-GaSb:Zn(111) was studied. It was shown that molten inclusions are displaced by a current (j=(1–4)×105 A/m2) toward a negative electrode in the temperature range T=750–920 K. The mechanism of this phenomenon was shown to be related to concentration changes in the bulk of molten incl...
Article
Full-text available
A microwave magnetic field crossed with a static field was found to exert a resonance effect on the dislocation mobility in single crystals of p-type silicon. The frequency of alternating field and the magnitude of static magnetic field corresponding to the maximal crystal hardening satisfy conditions for EPR of structural defects. This is evidence...
Article
This paper reports on the results of investigations into the dislocation mobility in n-Si single crystals (N d =5×1024 m−3) upon simultaneous exposure to electric (j=3×105 A/m2) and magnetic (B≤1 T) fields. It is found that the introduction of dislocations (≈109 m−2) into dislocation-free silicon doped with phosphorus leads to the appearance of th...
Article
Experimental and theoretical analysis of temperature fields generated by the pulsed current heating of metallization paths on a semiconductor wafer surface is performed. It is shown that any step change in the heating power causes bending vibrations of the wafer. Within the safety margins for semiconductor device operation, the vibration amplitude...