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Investigation of the Parameters of a Self-Focused Electron Beam Outputted Behind the Anode of a Vacuum Diode 真空二极管阳极后输出的自聚焦电子束参数研究
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023180141
V. I. Oleshko, V. V. Nguyen
{"title":"Investigation of the Parameters of a Self-Focused Electron Beam Outputted Behind the Anode of a Vacuum Diode","authors":"V. I. Oleshko, V. V. Nguyen","doi":"10.1134/s1063785023180141","DOIUrl":"https://doi.org/10.1134/s1063785023180141","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The parameters of a high-current electron beam extracted from the self-focusing zone through a hole in the anode into a vacuum chamber are investigated. The beam parameters were determined from the measurement of the spatial distribution of destruction and glow arising in polymethyl methacrylate samples installed at different distances from the anode (electron beam autographs). The formation of two electron beams—a self-focused with a high energy density, propagating along the axis of the cone facing the base to the anode with an apex angle of ~7° and a high-energy beam of low density, propagating in a hollow truncated cone and surrounding self-focused, was found. The oscillograms of the current and the energy of the electron beams were measured.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Laminar Chaos in Coupled Time-Delay Systems 耦合时延系统中的层状混沌
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023170157
D. D. Kulminskiy, V. I. Ponomarenko, M. D. Prokhorov
{"title":"Laminar Chaos in Coupled Time-Delay Systems","authors":"D. D. Kulminskiy, V. I. Ponomarenko, M. D. Prokhorov","doi":"10.1134/s1063785023170157","DOIUrl":"https://doi.org/10.1134/s1063785023170157","url":null,"abstract":"<p><b>Abstract</b>—The possibility of the existence of laminar chaos in coupled time-delayed feedback systems is investigated. The cases of unidirectional and mutual coupling of time-delay systems are considered. It is shown for the first time that laminar chaos can exist not only in a system with a variable delay time, but also in a system with a constant delay time, if it is coupled with a system in the regime of laminar chaos.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Anishchenko–Astakhov Quasiperiodic Generator Excited by External Harmonic Force 受外部谐波力激励的阿尼什琴科-阿斯塔霍夫准周期发电机
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023170170
A. P. Kuznetsov, Yu. V. Sedova
{"title":"Anishchenko–Astakhov Quasiperiodic Generator Excited by External Harmonic Force","authors":"A. P. Kuznetsov, Yu. V. Sedova","doi":"10.1134/s1063785023170170","DOIUrl":"https://doi.org/10.1134/s1063785023170170","url":null,"abstract":"<p><b>Abstract</b>—A harmonic effect on a modified Anishchenko–Astakhov generator capable of demonstrating two-frequency quasi-periodic oscillations in the autonomous mode is considered. The possibility of doubling the three-frequency tori in a non-autonomous system is shown. The possibility of the effect of chaos suppression by an external signal is demonstrated, which leads not only to periodic, but also to quasi-periodic modes when the influence amplitude exceeds a certain threshold.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Peculiarities of Nucleation and Growth of InGaN Nanowires on SiC/Si Substrates by HVPE 通过 HVPE 在碳化硅/硅衬底上成核和生长 InGaN 纳米线的特殊性
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023170145
S. A. Kukushkin, A. V. Osipov, A. V. Redkov, V. M. Stozharov, E. V. Ubiyvovk, Sh. Sh. Sharofidinov
{"title":"Peculiarities of Nucleation and Growth of InGaN Nanowires on SiC/Si Substrates by HVPE","authors":"S. A. Kukushkin, A. V. Osipov, A. V. Redkov, V. M. Stozharov, E. V. Ubiyvovk, Sh. Sh. Sharofidinov","doi":"10.1134/s1063785023170145","DOIUrl":"https://doi.org/10.1134/s1063785023170145","url":null,"abstract":"<p><b>Abstract</b>—The growth of InGaN layers on hybrid SiC/Si substrates with orientations (100), (110), and (111) by the HVPE method was studied at temperatures that wittingly exceed the temperature of InN decomposition onto nitrogen atoms and metallic In (1000°C). On substrates with orientations (110) and (111), the formation of InGaN whisker nanocrystals was observed. The shape and growth mechanisms of nanocrystals were investigated. It is shown that nanocrystals nucleate on the (111) surface only inside <i>V</i>-defects formed at the points where screw dislocations exit onto the surface. On the (110) surface, nanocrystals are formed only on pedestals that arise during the film growth. An explanation is given for the difference in the growth mechanisms of nanocrystals on substrates of different orientations.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Double Negative Media Based on Antiferromagnetic Semiconductors for the Terahertz Frequency Range 基于反铁磁半导体的太赫兹频率范围双负介质
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023180049
S. V. Grishin, A. V. Bogomolova, S. A. Nikitov
{"title":"Double Negative Media Based on Antiferromagnetic Semiconductors for the Terahertz Frequency Range","authors":"S. V. Grishin, A. V. Bogomolova, S. A. Nikitov","doi":"10.1134/s1063785023180049","DOIUrl":"https://doi.org/10.1134/s1063785023180049","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper presents the results of a theoretical study of the dispersion characteristics of electromagnetic waves (EMW) existing in a transversely magnetized antiferromagnetic (AFM) semiconductor with loss. An AFM semiconductor is an infinite bi-gyrotropic medium, the effective material parameters of which are twice negative in several frequency ranges. It was found that these frequency bands are in the terahertz range, and there are four backward EMEs in them, two of which are TE waves, and the other two are TM waves.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Problems of Flow Separation Detection By Pressure Sensors on a Unmanned Aerial Vehicles with a Propeller 带螺旋桨无人飞行器上压力传感器的分流检测问题
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023180153
P. A. Polivanov, A. A. Sidorenko
{"title":"Problems of Flow Separation Detection By Pressure Sensors on a Unmanned Aerial Vehicles with a Propeller","authors":"P. A. Polivanov, A. A. Sidorenko","doi":"10.1134/s1063785023180153","DOIUrl":"https://doi.org/10.1134/s1063785023180153","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>An experimental study of pulsations characteristics of the zone of flow separation arising at a small airplane- type UAV with a pushing two-blade propeller were carried out. The measurements were done in wind tunnel by unsteady pressure sensors and microphones built into the skin of the UAV for the test cases with and without a rotating propeller. A significant effect of the propeller on the level of pulsations was found. An increase of the incoming flow velocity led to a weakening of this effect. Analysis of the spectral data of the disturbances did not reveal a direct relationship between the propeller noise and the unsteady characteristics of the separation zone.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Kinetics of Spontaneous Formation of Core-Shell Structure in (In,Ga)As Nanowires (In,Ga)砷纳米线自发形成核壳结构的动力学
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-29 DOI: 10.1134/s1063785023170224
N. V. Sibirev, Y. S. Berdnikov, I. V. Shtrom, E. V. Ubyivovk, R. R. Reznik, G. E. Cirlin
{"title":"Kinetics of Spontaneous Formation of Core-Shell Structure in (In,Ga)As Nanowires","authors":"N. V. Sibirev, Y. S. Berdnikov, I. V. Shtrom, E. V. Ubyivovk, R. R. Reznik, G. E. Cirlin","doi":"10.1134/s1063785023170224","DOIUrl":"https://doi.org/10.1134/s1063785023170224","url":null,"abstract":"<p><b>Abstract</b>—A model of spontaneous formation of the core-shell structure in (In,Ga)As nanowire grown via molecular beam epitaxy without independent radial growth is proposed. Within the framework of the proposed model, the distribution of In across the axis of the nanowire was fitted.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the Question of an Analytical Estimate of Some Internal Sizes of the Earth 关于地球某些内部尺寸的分析估计问题
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-13 DOI: 10.1134/s1063785024700482
S. O. Gladkov
{"title":"On the Question of an Analytical Estimate of Some Internal Sizes of the Earth","authors":"S. O. Gladkov","doi":"10.1134/s1063785024700482","DOIUrl":"https://doi.org/10.1134/s1063785024700482","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Using a model representation of the motion of the Earth’s core in a viscous continuum, its equation of motion has been obtained and the linear size of the barysphere has been analytically found. A completely adequate estimate of the distance from the Earth’s center to the center of mass of the core has been given, which does not contradict modern geodetic concepts. It has been shown that the proposed model, which is not related to measuring the velocities of longitudinal and transverse seismic waves, makes it possible to determine quite satisfactorily all the basic geometric parameters of the barysphere.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microwave Tomography Method for Solving the Inverse Problem on Cylindrical Bodies 解决圆柱形物体逆问题的微波断层扫描法
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-13 DOI: 10.1134/s1063785024700469
A. O. Lapich, M. Y. Medvedik
{"title":"Microwave Tomography Method for Solving the Inverse Problem on Cylindrical Bodies","authors":"A. O. Lapich, M. Y. Medvedik","doi":"10.1134/s1063785024700469","DOIUrl":"https://doi.org/10.1134/s1063785024700469","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The principal aim of this study is to find a solution to the inverse problem of diffraction on cylindrical bodies located in free space. This problem can be applied in the diagnosis of breast cancer.<i>.</i> It is proposed to reduce the initial boundary value problem for the Helmholtz equation to an integral equation. This equation will be solved numerically. A two-step algorithm is used to solve the inverse problem. Graphic images are presented to illustrate the permittivity inside a body for the initial problem and for reconstructed values. A numerical method for finding the wave function is proposed and implemented, which makes it possible to identify the structure of an object without damaging or destroying it.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the Question of the Analytical Calculation of the Dry Fiction Coefficient 关于干舷系数的分析计算问题
IF 0.6 4区 物理与天体物理
Technical Physics Letters Pub Date : 2024-08-13 DOI: 10.1134/s1063785024700470
S. O. Gladkov
{"title":"On the Question of the Analytical Calculation of the Dry Fiction Coefficient","authors":"S. O. Gladkov","doi":"10.1134/s1063785024700470","DOIUrl":"https://doi.org/10.1134/s1063785024700470","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Based on the principles of correlation theory, the dependence is calculated of dry friction sliding factor <span>(k)</span> in the form of a function from Poisson coefficients of both bodies <span>(sigma )</span> and <span>(sigma ')</span> and temperature <span>(T)</span>. The research method is based on the application of Green’s temperature functions for unbalanced processes. The dependence of the dry friction factor on the Poisson coefficients of both bodies and temperature has been found. A mathematical description is given of the dry friction factor depending on the parameters, meaning the function <span>(k = kleft( {sigma ,sigma ',T} right))</span>, which this is extremely important for the practical application of the resulting dependency.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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