Radiophysics and Quantum Electronics最新文献_第3页

Bremsstrahlung at Low-Energy Electron–Nucleus Collisions in a Quantizing Magnetic Field. II. Close Collisions with Quasibound Motion 量子化磁场中低能电子-核碰撞的轫致辐射。2。准束缚运动的近碰撞

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2024-12-07 DOI: 10.1007/s11141-024-10343-6

S. A. Koryagin

{"title":"Bremsstrahlung at Low-Energy Electron–Nucleus Collisions in a Quantizing Magnetic Field. II. Close Collisions with Quasibound Motion","authors":"S. A. Koryagin","doi":"10.1007/s11141-024-10343-6","DOIUrl":"10.1007/s11141-024-10343-6","url":null,"abstract":"We analyze electron–nucleus collisions in a strongly magnetized ideal plasma with a low temperature at which the Coulomb interaction energy of particles at a distance of the order of the electron Larmor radius exceeds their thermal energy. In this limit, the motion of the electron in close collisions becomes quasibound. Analytical expressions for the spectral power of bremsstrahlung in the continuum at frequencies where quasibound motion makes a decisive contribution to the emission have been obtained. The proposed quantum approach is valid both in the limit of such a low energy of an electron that the latter can occupy only a fundamental Landau level before and after the collision and in the limit of classical particle motion. In the classical regime, the radiation losses approximately preserve the trajectory of the particle: the emission of a photon just changes the phase incursion of the electron wave function by the same amount within the cross section of a beam of rays approximating the state of the particle. A condition is formulated under which spontaneous emission puts the particle into a superposition of states essentially differing from the initial state by the probability for the electron to occupy different Landau levels after the collision. This emission regime takes place in the low-temperature plasma of the photosphere of a white dwarf in the infrared continuum.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 12","pages":"929 - 945"},"PeriodicalIF":0.8,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Models of Propagation of Acoustic Signals and Noise in Oceanic Waveguides with Wavy Surface and the Effectiveness of Spatial Signal Processing 声信号和噪声在波浪表面海洋波导中的传播模型及空间信号处理的有效性

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2024-12-07 DOI: 10.1007/s11141-024-10345-4

M. A. Raevskii, V. G. Burdukovskaya

引用次数: 0

Scalable Quantum Processor Based on Superconducting Fluxonium Qubits 基于超导通量质子的可扩展量子处理器

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2024-10-21 DOI: 10.1007/s11141-024-10341-8

G. S. Mazhorin, A. S. Kaz’mina, T. A. Chudakova, I. A. Simakov, N. A. Maleeva, I. N. Moskalenko, V. V. Ryazanov

引用次数: 0

Waveguide Integrated Superconducting Single-Photon Detector For Photonic And Ion Quantum Processors And Neuromorphic Computing 用于光子和离子量子处理器及神经形态计算的波导集成超导单光子探测器

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2024-10-18 DOI: 10.1007/s11141-024-10340-9

V. V. Kovalyuk, I. O. Venediktov, K. O. Sedykh, S. S. Svyatodukh, S. Hydyrova, K. M. Moiseev, I. N. Florya, A. I. Prokhodtsov, V. S. Galanova, D. M. Kobtsev, A. Yu. Kuzin, A. D. Golikov, G. N. Goltsman

{"title":"Waveguide Integrated Superconducting Single-Photon Detector For Photonic And Ion Quantum Processors And Neuromorphic Computing","authors":"V. V. Kovalyuk, I. O. Venediktov, K. O. Sedykh, S. S. Svyatodukh, S. Hydyrova, K. M. Moiseev, I. N. Florya, A. I. Prokhodtsov, V. S. Galanova, D. M. Kobtsev, A. Yu. Kuzin, A. D. Golikov, G. N. Goltsman","doi":"10.1007/s11141-024-10340-9","DOIUrl":"10.1007/s11141-024-10340-9","url":null,"abstract":"We consider superconducting single-photon detectors, which are the key element of quantum optical technologies due to their unique characteristics not available in other technologies today. Since the first demonstration in Russia in 2001, such detectors have evolved significantly, and their waveguide-based versions are ready for scaling both in the fields of classical technologies (attenuated light) and of quantum optical applications (non-classical light). The paper studies the operating principle of such detectors and their main characteristics, analyzes superconducting materials and dielectric waveguide platforms, highlights the design principles, considers various levels of integration of on-chip waveguide superconductor detectors, and presents important new areas of application towards the implementation of photonic and ion quantum processors, as well as energy-efficient neuromorphic computing.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 11","pages":"839 - 892"},"PeriodicalIF":0.8,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142555273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrated Circuits for Quantum Machine Learning Based on Superconducting Artificial Atoms and Methods of Their Control 基于超导人工原子的量子机器学习集成电路及其控制方法

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2024-10-18 DOI: 10.1007/s11141-024-10342-7

A. E. Tolstobrov, Sh. V. Kadyrmetov, G. P. Fedorov, S. V. Sanduleanu, V. B. Lubsanov, D. A. Kalacheva, A. N. Bolgar, A. Yu. Dmitriev, E. V. Korostylev, K. S. Tikhonov, O. V. Astafiev

{"title":"Integrated Circuits for Quantum Machine Learning Based on Superconducting Artificial Atoms and Methods of Their Control","authors":"A. E. Tolstobrov, Sh. V. Kadyrmetov, G. P. Fedorov, S. V. Sanduleanu, V. B. Lubsanov, D. A. Kalacheva, A. N. Bolgar, A. Yu. Dmitriev, E. V. Korostylev, K. S. Tikhonov, O. V. Astafiev","doi":"10.1007/s11141-024-10342-7","DOIUrl":"10.1007/s11141-024-10342-7","url":null,"abstract":"This paper is devoted to the use of quantum integrated circuits based on superconducting artificial atoms to solve quantum machine learning problems. The process of designing such chips is de- scribed in detail, including the selection of the most important geometric parameters of the device, as well as numerical calculations of electromagnetic characteristics. The process of controlling a quantum integrated circuit is described. Much attention is paid to the implementation of single- and two-qubit operations. The qubit state readout procedure is also described. A brief introduction into the field of quantum machine learning is given. An algorithm that makes it possible to solve multilabel classification problems using quantum integrated circuits is described. The selection of optimal quantum circuits for the implementation of this algorithm is made using numerical simulations. The operation of the algorithm is demonstrated by the example of standard datasets. Obtained experimental results are compared with the results of theoretical calculations.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 11","pages":"907 - 928"},"PeriodicalIF":0.8,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142555272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Study of Statistical Characteristics of the High-Frequency Vibrations of a Drill-String Bottom 钻弦底高频振动统计特性的实验研究

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2024-10-01 DOI: 10.1007/s11141-024-10338-3

V. K. Bakhtin, M. S. Deryabin, D. A. Kas’yanov, S. A. Manakov, D. R. Shakurov

引用次数: 0

The Influence of Cyclic Deformation on Elastic and Acoustic Properties of Chromium-Nickel Steels 循环变形对铬镍钢弹性和声学特性的影响

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2024-10-01 DOI: 10.1007/s11141-024-10339-2

V. A. Klyushnikov, A. V. Gonchar, V. V. Mishakin, K. V. Kurashkin

引用次数: 0

Gauging and Diagnostics of Turbine-Unit Shaft Lines by Torsional Oscillations 通过扭转振动测量和诊断涡轮机机组轴线

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2024-10-01 DOI: 10.1007/s11141-024-10337-4

A. L. Nazolin, A. I. Kumenko, V. I. Polyakov

{"title":"Gauging and Diagnostics of Turbine-Unit Shaft Lines by Torsional Oscillations","authors":"A. L. Nazolin, A. I. Kumenko, V. I. Polyakov","doi":"10.1007/s11141-024-10337-4","DOIUrl":"10.1007/s11141-024-10337-4","url":null,"abstract":"We consider the problems of developing the systems for gauging and diagnostics of the technical condition of the shaft lines of the steam-turbine generator sets of nuclear and thermal power plants using torsional vibrations. The requirements for full-time systems of diagnostic monitoring of torsional vibrations are formulated. The measuring schemes and methods to measure torsional vibrations of rotary machines by the time-interval measurement method are analyzed. Their advantages and disadvantages are shown. The reasons causing errors when measuring torsional vibrations are described. A method for measuring torsional vibrations of rotary machines by the time-interval method has been developed, which can serve as an arbitration technique, since it allows for the influence of the largest number of spurious factors and provides the most accurate measurement of torsional vibrations. The reasons for exciting torsional vibrations of the shaft lines of the gas turbine generator sets and the methods of their identification, ways to solve the problem of assessing the stress-strain state of the shaft line in dynamics, and early detection of the shaft line integrity defects during operation are considered.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 10","pages":"798 - 816"},"PeriodicalIF":0.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a Microwave Diagnostic Method for Measurements of the Free-Surface Velocity in the Plane-Wave Experiment 开发用于平面波实验中自由表面速度测量的微波诊断方法

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2024-10-01 DOI: 10.1007/s11141-024-10336-5

V. V. Balandin, Vl. Vl. Balandin, P. M. Zemlyanukha, L. A. Igumnov, K. V. Mineev, V. V. Parkhachev, R. M. Rozental

引用次数: 0

Dynamic Behavior of a Beam Resting on a Viscoelastic Two-Parameter Base and Carrying a Moving Load 靠在粘弹性双参数基座上的横梁在承载移动载荷时的动态特性

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2024-09-30 DOI: 10.1007/s11141-024-10330-x

V. I. Erofeev, E. E. Lisenkova

{"title":"Dynamic Behavior of a Beam Resting on a Viscoelastic Two-Parameter Base and Carrying a Moving Load","authors":"V. I. Erofeev, E. E. Lisenkova","doi":"10.1007/s11141-024-10330-x","DOIUrl":"10.1007/s11141-024-10330-x","url":null,"abstract":"We consider the dynamic behavior of a beam with a moving load resting on a deformable base and characterized by two bed coefficients with allowance for dissipative losses. A self-consistent boundary-value problem has been formulated which correctly takes into account the interaction forces in a moving contact. The features of the bending-wave generation by a zero-frequency oscillation source are studied. The critical velocities of the source motion are determined. In the case of low viscosity, the critical velocities do not depend on dissipative losses in the base and are determined by the physical and mechanical properties of the beam and the bed coefficients. An expression for the force due to the wave pressure (the force of resistance to motion) is obtained. The dependence of the constant component of this force on the object velocity and elastic and viscous parameters of the base is studied. The calculation of the energy consumption of the source, which ensures the object motion at a constant velocity, is carried out. When the load moves at a velocity not exceeding the minimum phase velocity of the bending-wave propagation in the beam, the motion-resistance force and the energy consumption are zero and differ from zero in the presence of dissipative losses in the deformable base. A comparison with the results obtained for the one-parameter elastic base of the Fuss-Winkler model is given.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 10","pages":"721 - 728"},"PeriodicalIF":0.8,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0