Pub Date : 2020-08-31DOI: 10.15587/1729-4061.2020.209269
V. Yatsun, G. Filimonikhin, Antonina Haleeva, Larisa Krivoblotsky, Y. Machok, M. Mezitis, N. Podoprygora, M. Sadovyi, G. Strautmanis
The dynamics of a three-mass vibratory machine with the rectilinear translational motion of platforms and a vibration exciter in the form of a ball, roller, or pendulum auto-balancer have been analytically investigated.
The existence of steady state motion modes of a vibratory machine that are close to two-frequency regimes has been established. At these motions, the loads in an auto-balancer create constant imbalance, cannot catch up with the rotor, and get stuck at a certain frequency. These loads work as the first vibration exciter, thereby exciting vibrations in resonance with the frequency at which loads get stuck. The second vibration exciter is formed by an unbalanced mass on the body of the auto-balancer. The mass rotates at the rotor's rotation frequency and excites faster vibrations with this frequency. The auto-balancer excites almost ideal two-frequency vibrations. Deviations from the two-frequency law are proportional to the ratio of the mass of the loads to the mass of the platform, which hosts the auto-balancer, and do not exceed 5 %.
A three-mass vibratory machine has three resonant (natural) oscillation frequencies, q1, q2, q3 (q1).
{"title":"Searching for the Twofrequency Motion Modes of a Threemass Vibratory Machine With a Vibration Exciter in the Form of a Passive Autobalancer","authors":"V. Yatsun, G. Filimonikhin, Antonina Haleeva, Larisa Krivoblotsky, Y. Machok, M. Mezitis, N. Podoprygora, M. Sadovyi, G. Strautmanis","doi":"10.15587/1729-4061.2020.209269","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.209269","url":null,"abstract":"The dynamics of a three-mass vibratory machine with the rectilinear translational motion of platforms and a vibration exciter in the form of a ball, roller, or pendulum auto-balancer have been analytically investigated.<br><br>The existence of steady state motion modes of a vibratory machine that are close to two-frequency regimes has been established. At these motions, the loads in an auto-balancer create constant imbalance, cannot catch up with the rotor, and get stuck at a certain frequency. These loads work as the first vibration exciter, thereby exciting vibrations in resonance with the frequency at which loads get stuck. The second vibration exciter is formed by an unbalanced mass on the body of the auto-balancer. The mass rotates at the rotor's rotation frequency and excites faster vibrations with this frequency. The auto-balancer excites almost ideal two-frequency vibrations. Deviations from the two-frequency law are proportional to the ratio of the mass of the loads to the mass of the platform, which hosts the auto-balancer, and do not exceed 5 %.<br><br>A three-mass vibratory machine has three resonant (natural) oscillation frequencies, q1, q2, q3 (q1).","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81305221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-31DOI: 10.15587/1729-4061.2020.210665
I. Cherniavskiy, M. Chomik, V. Tiutiunyk, Ihor Rolin, V. Starenkiy, M. Tverezovskyi, Oleksandr Sheptur, T. Kurtseitov, Oleksandr Salii, Mykola Pidhorodetskyi
The necessity and possibility of creating a dosimetric channel for determining the direction to the source of penetrating gamma-radiation in the nuclear situation monitoring system have been substantiated. The experimental assessment of a reduced error of the device for determining the direction to pulsed sources of radiation using a spherical absorber and CdTe detectors was carried out. These detectors can be used effectively only if there is appropriate electronic equipment, constructed in accordance with their characteristics and spectral-temporal characteristics of highly intense pulsed radiation. The direction to high-intensity pulsed radiation of linear accelerator Varian Clinac 600C (USA) by telluride-cadmium detectors was determined in the pulsed mode. This allowed conducting an experiment to determine the dependence of the coefficient of proportionality of recording pulses from each detector on the angle of direction to the source of pulsed radiation of the linear accelerator. A reduced error was assessed by comparing the received experimental data with a theoretical dependence based on a physical and mathematical model. It was recommended to divide the entire range of angles from 0° to 360° into five sub-ranges, in which three or two proportionality coefficients are responsible for determining the angle in space on gamma sources. The maximum reduced error does not exceed 10 % and the maximum angle error is not more than 8.4°. The most accurate determining of the angle to a radiation source can be carried out in the presence of a theoretically calculated and experimental database of proportionality coefficients for all angles in space and energy of radiation sources
{"title":"Experimental Evaluation of Accuracy in Determining the Direction to a Pulsed Source of Gamma-Radiation by a Spherical Absorber With CdTe Detectors in a System of Nuclear Situation Monitoring","authors":"I. Cherniavskiy, M. Chomik, V. Tiutiunyk, Ihor Rolin, V. Starenkiy, M. Tverezovskyi, Oleksandr Sheptur, T. Kurtseitov, Oleksandr Salii, Mykola Pidhorodetskyi","doi":"10.15587/1729-4061.2020.210665","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.210665","url":null,"abstract":"The necessity and possibility of creating a dosimetric channel for determining the direction to the source of penetrating gamma-radiation in the nuclear situation monitoring system have been substantiated. The experimental assessment of a reduced error of the device for determining the direction to pulsed sources of radiation using a spherical absorber and CdTe detectors was carried out. These detectors can be used effectively only if there is appropriate electronic equipment, constructed in accordance with their characteristics and spectral-temporal characteristics of highly intense pulsed radiation. The direction to high-intensity pulsed radiation of linear accelerator Varian Clinac 600C (USA) by telluride-cadmium detectors was determined in the pulsed mode. This allowed conducting an experiment to determine the dependence of the coefficient of proportionality of recording pulses from each detector on the angle of direction to the source of pulsed radiation of the linear accelerator. A reduced error was assessed by comparing the received experimental data with a theoretical dependence based on a physical and mathematical model. It was recommended to divide the entire range of angles from 0° to 360° into five sub-ranges, in which three or two proportionality coefficients are responsible for determining the angle in space on gamma sources. The maximum reduced error does not exceed 10 % and the maximum angle error is not more than 8.4°. The most accurate determining of the angle to a radiation source can be carried out in the presence of a theoretically calculated and experimental database of proportionality coefficients for all angles in space and energy of radiation sources","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82579065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-31DOI: 10.15587/1729-4061.2020.210312
I. Nazarenko, O. Didenko, A. Loboda, R. Kushlyk, L. Chervinsky
The results of the research into the electrical properties of the "water in castor oil" emulsion, which make it possible to substantiate the technology of castor oil purification from plant impurities and water in an electric field, were presented.
The experimental studies of the electrical properties of the "water in castor oil" emulsion revealed the dependences of specific resistance to direct and alternating currents and dielectric loss angle tangent on the temperature and water content. It was proved that the active component of specific resistance to the suspension "water in castor oil" on AC is smaller than resistance to DC. That is why, at the temperature of 80 °C and water content of 2 %, heat release on AC is 10 % higher than the heat release on DC. According to this, it is advisable to perform the process of castor oil purification from plant impurities and water residues on AC. This makes it possible to obtain additional heat release and thereby compensate for heat losses for the vaporization of flotation bubbles, which leads to the stable process of flotation purification. A comparison of the magnitudes of polarization losses and losses of end-to-end electrical conductivity for pure oil indicates their identical order. The addition of water leads to an increase in polarization losses due to the structural and dipole polarization of water as a polar fluid. Due to this, from the theoretical point of view, it can be argued about additional local heat release on finely dispersed water drops in the quantity, which can ensure the compensation for the heat needed for vaporization. According to this, vaporization does not require indirect heating of the electrode area from an external source at the expense of thermal conductivity.
The obtained results of the experimental research make it possible to substantiate the technological and structural parameters of the electro-technological complex of castor oil purification in the electric field of the cylindrical system of electrodes.
{"title":"Electrical Properties of 'Water in Castor Oil' Emulsion","authors":"I. Nazarenko, O. Didenko, A. Loboda, R. Kushlyk, L. Chervinsky","doi":"10.15587/1729-4061.2020.210312","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.210312","url":null,"abstract":"The results of the research into the electrical properties of the \"water in castor oil\" emulsion, which make it possible to substantiate the technology of castor oil purification from plant impurities and water in an electric field, were presented.<br><br>The experimental studies of the electrical properties of the \"water in castor oil\" emulsion revealed the dependences of specific resistance to direct and alternating currents and dielectric loss angle tangent on the temperature and water content. It was proved that the active component of specific resistance to the suspension \"water in castor oil\" on AC is smaller than resistance to DC. That is why, at the temperature of 80 °C and water content of 2 %, heat release on AC is 10 % higher than the heat release on DC. According to this, it is advisable to perform the process of castor oil purification from plant impurities and water residues on AC. This makes it possible to obtain additional heat release and thereby compensate for heat losses for the vaporization of flotation bubbles, which leads to the stable process of flotation purification. A comparison of the magnitudes of polarization losses and losses of end-to-end electrical conductivity for pure oil indicates their identical order. The addition of water leads to an increase in polarization losses due to the structural and dipole polarization of water as a polar fluid. Due to this, from the theoretical point of view, it can be argued about additional local heat release on finely dispersed water drops in the quantity, which can ensure the compensation for the heat needed for vaporization. According to this, vaporization does not require indirect heating of the electrode area from an external source at the expense of thermal conductivity.<br><br>The obtained results of the experimental research make it possible to substantiate the technological and structural parameters of the electro-technological complex of castor oil purification in the electric field of the cylindrical system of electrodes.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77003441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-31DOI: 10.15587/2706-5448.2020.210369
L. Deyneko, N. Kobasko
The object of research is the structure and mechanical properties of steel at the central points of hardened products. In this work, a technique has been developed based on comparing the cooling rate in the central region of the product with the cooling rate of a test sample with a diameter of 5–6 mm, investigated in laboratory conditions. By this time, this approach was not possible, since two main problems had not been resolved. The transition from a small sample to a real product during quenching was scientifically unreasonable due to the great complexity of the problem. There were no known mathematical relationships for calculating the cooling rate when quenching products of arbitrary shape in liquids. Recently, these problems have been solved and steel with optimal harden-ability has appeared, which can be cooled very quickly. This simplified the solution to this problem. The technique developed in this work helps to temper metal products in such a way that there are large compressive residual stresses on the surface, and in the middle there is a bainite structure of high strength and increased toughness. This allows to increase the service life of hardened products, reduce the percentage of alloying elements, and also maintain a clean environment. In this regard, based on the achievements of science in recent decades, a method is proposed for predicting the structure and mechanical properties of steel during quenching of real parts. This technique can be used to increase the durability of machine parts and tools. The work also notes the prospects of using aqueous solutions of low-concentration polymers for intensive hardening of steel products. In this case, when simulating the cooling rate during quenching of real products, test samples are quenched in aqueous solutions of the same polymers of increased concentration in order to form a stable vapor film. The stable vapor film ensures a stable heat transfer coefficient. This increases the accuracy of modeling and expands the capabilities of the proposed calculation method.
{"title":"Simplified Method of Forecasting the Influence of Cooling Intensity During Hardening on the Mechanical Properties of Steel Products","authors":"L. Deyneko, N. Kobasko","doi":"10.15587/2706-5448.2020.210369","DOIUrl":"https://doi.org/10.15587/2706-5448.2020.210369","url":null,"abstract":"The object of research is the structure and mechanical properties of steel at the central points of hardened products. In this work, a technique has been developed based on comparing the cooling rate in the central region of the product with the cooling rate of a test sample with a diameter of 5–6 mm, investigated in laboratory conditions. By this time, this approach was not possible, since two main problems had not been resolved. The transition from a small sample to a real product during quenching was scientifically unreasonable due to the great complexity of the problem. There were no known mathematical relationships for calculating the cooling rate when quenching products of arbitrary shape in liquids. Recently, these problems have been solved and steel with optimal harden-ability has appeared, which can be cooled very quickly. This simplified the solution to this problem. The technique developed in this work helps to temper metal products in such a way that there are large compressive residual stresses on the surface, and in the middle there is a bainite structure of high strength and increased toughness. This allows to increase the service life of hardened products, reduce the percentage of alloying elements, and also maintain a clean environment. In this regard, based on the achievements of science in recent decades, a method is proposed for predicting the structure and mechanical properties of steel during quenching of real parts. This technique can be used to increase the durability of machine parts and tools. The work also notes the prospects of using aqueous solutions of low-concentration polymers for intensive hardening of steel products. In this case, when simulating the cooling rate during quenching of real products, test samples are quenched in aqueous solutions of the same polymers of increased concentration in order to form a stable vapor film. The stable vapor film ensures a stable heat transfer coefficient. This increases the accuracy of modeling and expands the capabilities of the proposed calculation method.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89764410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-31DOI: 10.15587/2706-5448.2020.210272
V. Semerenko
The object of research is the processes of error-correcting coding in telecommunication and computer systems. The main attention is paid to Reed-Solomon (RS) codes, which belong to the very widespread error-correcting codes. Despite the 60-year existence of these codes, the complexity of their decoding still remains a problem. This problem is mainly due to the use of an algebraic approach to their description.
The article proposes to use the theory of linear finite-state machine (LFSM) for RS codes as a mathematical basis, which is a combination of the theory of digital filters and finite automaton over nonbinary Galois fields. In the course of research, 12 types of LFSMs are considered for the first time: the recursive LFSMs of 8 types and the non-recursive LFSMs of 4 types.
The recursive LFSMs are used for systematic encoding and form a circuit for dividing of polynomials, and the non-recursive LFSMs are used for non-systematic encoding and form a circuit for multiplying of polynomials. All types of LFSMs give the same result for encoding and decoding, but with different complexity, which is impor-tant for practical implementation.
The automaton representation is the most suitable for RS codes, since it takes into account the cyclicity property and other features of these codes to the maximum. In contrast to algebraic methods, automaton decoding methods have a simple software and hardware implementation and high performance. With the help of automaton-graphical models, it can accurately estimate the corrective capability of the code. Automaton representation combines known methods of representing Reed-Solomon codes (polynomial, matrix, algebraic) and provides mutual transitions between them.
The article attention is spare to the fact that automaton methods for encoding and decoding (n, k)-codes of RS using quantum computers give a gain in time n times.
{"title":"Presentation of Reed-Solomon Codes Based on Automaton Theory","authors":"V. Semerenko","doi":"10.15587/2706-5448.2020.210272","DOIUrl":"https://doi.org/10.15587/2706-5448.2020.210272","url":null,"abstract":"The object of research is the processes of error-correcting coding in telecommunication and computer systems. The main attention is paid to Reed-Solomon (RS) codes, which belong to the very widespread error-correcting codes. Despite the 60-year existence of these codes, the complexity of their decoding still remains a problem. This problem is mainly due to the use of an algebraic approach to their description.<br><br>The article proposes to use the theory of linear finite-state machine (LFSM) for RS codes as a mathematical basis, which is a combination of the theory of digital filters and finite automaton over nonbinary Galois fields. In the course of research, 12 types of LFSMs are considered for the first time: the recursive LFSMs of 8 types and the non-recursive LFSMs of 4 types.<br><br>The recursive LFSMs are used for systematic encoding and form a circuit for dividing of polynomials, and the non-recursive LFSMs are used for non-systematic encoding and form a circuit for multiplying of polynomials. All types of LFSMs give the same result for encoding and decoding, but with different complexity, which is impor-tant for practical implementation.<br><br>The automaton representation is the most suitable for RS codes, since it takes into account the cyclicity property and other features of these codes to the maximum. In contrast to algebraic methods, automaton decoding methods have a simple software and hardware implementation and high performance. With the help of automaton-graphical models, it can accurately estimate the corrective capability of the code. Automaton representation combines known methods of representing Reed-Solomon codes (polynomial, matrix, algebraic) and provides mutual transitions between them.<br><br>The article attention is spare to the fact that automaton methods for encoding and decoding (n, k)-codes of RS using quantum computers give a gain in time n times.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76489996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this research, the tribo-mechanical behaviour of self-lubricating aluminium (Al) based hybrid metal matrix composites (MMCs) reinforced with graphite (Gr) and Al2O3 particles (Al+Gr+Al2O3) were studied aiming to obtain the superior wear and mechanical properties in a single material. Three different compositions of hybrid MMCs were fabricated by powder metallurgy technique, their wear and mechanical properties were tested and compared with pure monolithic Al and Al+Gr composite. The microstructure of the samples was examined and various mechanical properties such as microhardness, tensile and flexural strength were evaluated. The wear behaviour of the hybrid MMCs was investigated by using a pin-on-disc tribometer. The results revealed that the combined effect of Al2O3 and graphite reinforcement particles significantly improved the wear and mechanical properties of hybrid MMCs. All the mechanical properties were increased and the wear rate and coefficient of friction were decreased remarkably. Besides, the reinforcement composition of 3%Gr and 10%Al2O3 (Al+3%Gr+10%Al2O3) forms a smooth tribosurface thus increases the wear resistant properties at the highest level than that of other compositions of the hybrid MMCs.
{"title":"Tribo-Mechanical Characterization of Self-Lubricating Aluminium Based Hybrid Metal Matrix Composite Fabricated Via Powder Metallurgy","authors":"N. Zamani, A. A. Iqbal, D. M. Nuruzzaman","doi":"10.2139/ssrn.3673573","DOIUrl":"https://doi.org/10.2139/ssrn.3673573","url":null,"abstract":"In this research, the tribo-mechanical behaviour of self-lubricating aluminium (Al) based hybrid metal matrix composites (MMCs) reinforced with graphite (Gr) and Al2O3 particles (Al+Gr+Al2O3) were studied aiming to obtain the superior wear and mechanical properties in a single material. Three different compositions of hybrid MMCs were fabricated by powder metallurgy technique, their wear and mechanical properties were tested and compared with pure monolithic Al and Al+Gr composite. The microstructure of the samples was examined and various mechanical properties such as microhardness, tensile and flexural strength were evaluated. The wear behaviour of the hybrid MMCs was investigated by using a pin-on-disc tribometer. The results revealed that the combined effect of Al2O3 and graphite reinforcement particles significantly improved the wear and mechanical properties of hybrid MMCs. All the mechanical properties were increased and the wear rate and coefficient of friction were decreased remarkably. Besides, the reinforcement composition of 3%Gr and 10%Al2O3 (Al+3%Gr+10%Al2O3) forms a smooth tribosurface thus increases the wear resistant properties at the highest level than that of other compositions of the hybrid MMCs.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84418597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Radar Systems are used for the detection of objects by transmitting electromagnetic waves in the free space. They operate in environments where there is a high possibility that the desired echo signal interferes with the signals from other sources. These signals include clutters and jammer signals. The jammer is a device that continuously emits the wideband radio signals in the radar environment, to saturate the receiver with noise or false information. Thus, the total received signal has three components- returns from target, clutter, and jammer combined i.e. it is a three dimensional signal. The use of conventional signal processing techniques is not desirable, as they cannot separate the desired echo signal from the other components, because the statistics of these components present in the received signal is not known. This problem needs to be accounted for, in airborne surveillance radars, as they have to identify and locate the targets in multiple interference environments. The Space-Time Adaptive Techniques (STAP) is a combination of spatial and temporal filtering that can nullify the jammer signal, and recognize the slow-moving targets. These techniques filter the signal in the angular and the Doppler domain for suppressing the unwanted signals. This paper presents a theoretical study of space-time adaptive coding techniques, and the MATLAB implementation of STAP algorithms; namely, SMI, DPCA, and ADPCA, to suppress clutter and jammer interference in the received pulse.
{"title":"Space-Time Adaptive Processing Techniques (STAP) for Mitigation of Jammer Interference and Clutter Suppression in Airborne Radar Systems: A MATLAB Implementation-based Study","authors":"Chaitanya Vijaykumar Mahamuni","doi":"10.2139/ssrn.3697565","DOIUrl":"https://doi.org/10.2139/ssrn.3697565","url":null,"abstract":"Radar Systems are used for the detection of objects by transmitting electromagnetic waves in the free space. They operate in environments where there is a high possibility that the desired echo signal interferes with the signals from other sources. These signals include clutters and jammer signals. The jammer is a device that continuously emits the wideband radio signals in the radar environment, to saturate the receiver with noise or false information. Thus, the total received signal has three components- returns from target, clutter, and jammer combined i.e. it is a three dimensional signal. The use of conventional signal processing techniques is not desirable, as they cannot separate the desired echo signal from the other components, because the statistics of these components present in the received signal is not known. This problem needs to be accounted for, in airborne surveillance radars, as they have to identify and locate the targets in multiple interference environments. The Space-Time Adaptive Techniques (STAP) is a combination of spatial and temporal filtering that can nullify the jammer signal, and recognize the slow-moving targets. These techniques filter the signal in the angular and the Doppler domain for suppressing the unwanted signals. This paper presents a theoretical study of space-time adaptive coding techniques, and the MATLAB implementation of STAP algorithms; namely, SMI, DPCA, and ADPCA, to suppress clutter and jammer interference in the received pulse.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73331596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Hassani, D. Veysset, Yuchen Sun, K. Nelson, C. Schuh
Abstract We present a comprehensive experimental campaign of high-velocity microparticle impacts with different combinations of particle and substrate materials to identify possible deformation regimes. Based on experimental observations of the impact sites, we identify three typical modes of behavior, namely, splatting, co-deformation, and penetration. We develop a theoretical framework to predict the operative regime for a given particle/substrate combination, ranging from splatting and penetration at two extremes of a spectrum, and co-deformation in the center. We propose an impact ratio based on the materials’ properties, which can successfully quantify the spectrum. Co-deformation is expected when the ratio is around unity, while much larger or smaller ratios give rise to penetration and splatting, respectively.
{"title":"Microparticle Impact-Bonding Modes for Mismatched Metals: From Co-Deformation to Splatting and Penetration","authors":"M. Hassani, D. Veysset, Yuchen Sun, K. Nelson, C. Schuh","doi":"10.2139/ssrn.3649218","DOIUrl":"https://doi.org/10.2139/ssrn.3649218","url":null,"abstract":"Abstract We present a comprehensive experimental campaign of high-velocity microparticle impacts with different combinations of particle and substrate materials to identify possible deformation regimes. Based on experimental observations of the impact sites, we identify three typical modes of behavior, namely, splatting, co-deformation, and penetration. We develop a theoretical framework to predict the operative regime for a given particle/substrate combination, ranging from splatting and penetration at two extremes of a spectrum, and co-deformation in the center. We propose an impact ratio based on the materials’ properties, which can successfully quantify the spectrum. Co-deformation is expected when the ratio is around unity, while much larger or smaller ratios give rise to penetration and splatting, respectively.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82721562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Deep Computer Vision is capable of doing object detection and image classification task. In an image classification tasks, the particular system receives some input image and the system is aware of some predetermined set of categories or labels. There are some fixed set of category labels and the job of the computer is to look at the picture and assign it a fixed category label.
Convolutional Neural Network (CNN) has gained wide popularity in the field of pattern recognition and machine learning. In our present work, we have constructed a Convolutional Neural Network (CNN) for the identification of the presence of tantalum and niobium fragments in a High Entropy Alloy (HEA). The results showed 100 % accuracy while testing the given dataset.
{"title":"Deep Computer Vision for the Detection of Tantalum and Niobium Fragments in High Entropy Alloys","authors":"Akshansh Mishra","doi":"10.2139/ssrn.3653210","DOIUrl":"https://doi.org/10.2139/ssrn.3653210","url":null,"abstract":"Deep Computer Vision is capable of doing object detection and image classification task. In an image classification tasks, the particular system receives some input image and the system is aware of some predetermined set of categories or labels. There are some fixed set of category labels and the job of the computer is to look at the picture and assign it a fixed category label. <br><br>Convolutional Neural Network (CNN) has gained wide popularity in the field of pattern recognition and machine learning. In our present work, we have constructed a Convolutional Neural Network (CNN) for the identification of the presence of tantalum and niobium fragments in a High Entropy Alloy (HEA). The results showed 100 % accuracy while testing the given dataset.<br>","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73140103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The popularity of 3 phase induction motors on board ships is because of their simple, robust construction, and high reliability factor in the sea environment. A 3-phase induction motor can be used for different applications with various speed and load requirements. Electric motors can be found in almost every production process today. Getting the most out of your application is becoming more and more important in order to ensure cost-effective operations.
{"title":"Three-phase Induction Motor: Types and Structure","authors":"Saif Aldeen Saad Alkadhim","doi":"10.2139/ssrn.3647425","DOIUrl":"https://doi.org/10.2139/ssrn.3647425","url":null,"abstract":"The popularity of 3 phase induction motors on board ships is because of their simple, robust construction, and high reliability factor in the sea environment. A 3-phase induction motor can be used for different applications with various speed and load requirements. Electric motors can be found in almost every production process today. Getting the most out of your application is becoming more and more important in order to ensure cost-effective operations.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89009027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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