Journal of Experimental and Theoretical Physics最新文献

英文中文

Accuracy, Performance, and Transferability of Interparticle Potentials for Al–Cu Alloys: Comparison of Embedded Atom and Deep Machine Learning Models 铝铜合金粒子间电位的准确性、性能和可转移性：嵌入式原子模型与深度机器学习模型的比较

IF 1.1 4区物理与天体物理 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120208

E. O. Khazieva, N. M. Shchelkatchev, A. O. Tipeev, R. E. Ryltsev

Abstract

In several recent years, a significant progress has been made in atomistic simulation of materials, involving the application of machine learning methods to constructing classical interatomic interaction potentials. These potentials are many-body functions with a large number of variable parameters whose values are optimized with the use of energies and forces calculated for various atomic configurations by ab initio methods. In the present paper a machine learning potential is developed on the basis of deep neural networks (DP) for Al–Cu alloys, and the accuracy and performance of this potential is compared with the embedded atom potential. The analysis of the results obtained implies that the DP provides a sufficiently high accuracy of calculation of the structural, thermodynamic, and transport properties of Al–Cu alloys in both solid and liquid states over the entire range of compositions and a wide temperature interval. The accuracy of the embedded atom model (EAM) in calculating the same properties is noticeably lower on the whole. It is demonstrated that the application of the potentials based on neural networks to the simulation on modern graphic processors allows one to reach a computational efficiency on the same order of magnitude as those of the embedded atom calculations, which at least four orders of magnitude higher than the computational efficiency of ab initio calculations. The most important result is that about the possibility of application of DP parameterized with the use of configurations corresponding to melts and perfect crystals to the simulation of structural defects in crystals and interphase surfaces.

摘要近年来，原子模拟材料取得了重大进展，其中包括应用机器学习方法构建经典原子间相互作用势。这些位势是具有大量可变参数的多体函数，其数值是通过使用ab initio方法计算出的各种原子构型的能量和力进行优化的。本文在深度神经网络（DP）的基础上为铝铜合金开发了一种机器学习势，并将这种势的精度和性能与嵌入式原子势进行了比较。对所获结果的分析表明，在整个成分范围和较宽的温度区间内，深度神经网络对铝铜合金在固态和液态下的结构、热力学和传输特性的计算提供了足够高的精度。而嵌入式原子模型（EAM）计算相同性质的精度总体上明显较低。研究表明，在现代图形处理器上应用基于神经网络的电位进行模拟，可以达到与嵌入式原子计算相同数量级的计算效率，比原子模型的计算效率至少高出四个数量级。最重要的结果是，利用与熔体和完美晶体相对应的构型参数化 DP 可以模拟晶体和相间表面的结构缺陷。

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引用次数: 0

Magnetic Interparticle Interactions and Superparamagnetic Blocking of Powder Systems of Biogenic Ferrihydrite Nanoparticles 生物铁氧体纳米粒子粉末系统的磁性粒子间相互作用和超顺磁性阻塞

IF 1.1 4区物理与天体物理 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120075

A. A. Krasikov, Yu. V. Knyazev, D. A. Balaev, S. V. Stolyar, V. P. Ladygina, A. D. Balaev, R. S. Iskhakov

Abstract

The magnetic-field dependence of the superparamagnetic-blocking temperature T_B of systems of antiferromagnetically ordered ferrihydrite nanoparticles has been investigated and analyzed. We studied two powder systems of nanoparticles: particles of “biogenic” ferrihydrite (with an average size of 2.7 nm), released as a result of vital functions of bacteria and coated with a thin organic shell, and particles of biogenic ferrihydrite subjected to low-temperature annealing, which cause an increase in the average particle size (to 3.8 nm) and burning out of the organic shell. The character of the temperature dependences of magnetization, measured after cooling in a weak field, as well as the shape of the obtained dependences T_B(H), demonstrate peculiar features, indicating the influence of magnetic interparticle interactions. A detailed analysis of the dependences T_B(H) within the random magnetic anisotropy model made it possible to estimate quantitatively the intensity of magnetic particle–particle interactions and determine the magnetic anisotropy constants of individual ferrihydrite particles.

摘要研究和分析了反铁磁有序纳米铁酸盐体系的超顺磁性阻滞温度 TB 的磁场依赖性。我们研究了两种纳米颗粒粉末体系：一种是 "生物 "铁氧体颗粒（平均粒径为 2.7 nm），这种颗粒是由于细菌的生命机能而释放出来的，表面包裹着一层薄薄的有机外壳；另一种是生物铁氧体颗粒，这种颗粒经过低温退火处理后，平均粒径增大（达到 3.8 nm），有机外壳烧毁。在弱磁场中冷却后测量的磁化率随温度变化的特征，以及所获得的随温度变化的 TB(H) 的形状，都显示出特殊的特征，表明磁性粒子间相互作用的影响。通过详细分析随机磁各向异性模型中的 TB(H) 相关性，可以定量估算磁性粒子间相互作用的强度，并确定单个无水铁氧体粒子的磁各向异性常数。

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引用次数: 0

Magnetically Induced Flows in Thrombosed Channels with a Ferrofluid Layer 带铁流体层的血栓通道中的磁诱导流动

IF 1.1 4区物理与天体物理 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120117

A. Yu. Musickhin, A. Yu. Zubarev

Abstract

We proposed a theoretical model and a method for its approximate analysis for flows induced by a uniform rotating magnetic field in a channel filled with a nonmagnetic fluid with a ferrofluid layer injected into it. One end of the channel is assumed to be blocked (thrombosed). This study is aimed at the development of the scientific basis of the magnetically induced intensification of drug transport in blocked blood vessels.

摘要我们提出了一个理论模型及其近似分析方法，用于分析均匀旋转磁场在充满非磁性流体并注入铁流体层的通道中引起的流动。假定通道的一端被堵塞（血栓形成）。这项研究的目的是为在堵塞的血管中磁力诱导强化药物运输奠定科学基础。

引用次数: 0

Quasilinear Simulation of the Development of Weibel Turbulence in Anisotropic Collisionless Plasma 各向异性无碰撞等离子体中魏伯尔湍流发展的准线性模拟

IF 1.1 4区物理与天体物理 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120099

A. A. Kuznetsov, A. A. Nechaev, M. A. Garasev, Vl. V. Kocharovsky

Abstract

A spectral quasilinear approach to the problem of TEM-Weibel instability in an anisotropic collisionless plasma is developed, which takes into account only the integral nonlinear interaction of modes through the joint variation of the spatially averaged particle velocity distribution induced by these modes. Within this approximation, a closed system of equations is obtained for the one- and two-dimensional evolution of spatial modes (harmonics) of the distribution function of particles and the electromagnetic field under conditions when the plasma anisotropy axis, the wave vector, and the magnetic field of the modes are orthogonal to each other. The numerical solution of this system of equations is compared with the available results of one-dimensional analytical quasilinear theory in the region of its applicability, as well as with the results of two-dimensional simulation by the particle-in-cell method, which also takes into account the direct four-wave interaction of modes. It is established that in the simplest cases of one-dimensional and axially symmetric two-dimensional problems for a bi-Maxwellian plasma, quasilinear phenomena play the leading role at a quite long stage of nonlinear development of turbulence. It is noted that at a later stage of decay of turbulence and in a more general formulation of the problem, in particular, in the presence of an external magnetic field, the direct nonlinear interaction of modes can manifest itself along with quasilinear phenomena. Based on the analysis carried out, the contribution of certain nonlinear effects to the evolution of the spatial spectrum of Weibel turbulence is revealed, and the properties of this turbulence are studied, including the self-similar character and qualitatively different stages of the dynamics of unstable modes.

摘要针对各向异性无碰撞等离子体中的 TEM-Weibel 不稳定性问题，提出了一种频谱准线性方法，该方法仅考虑了通过这些模态引起的空间平均粒子速度分布的联合变化而产生的模态积分非线性相互作用。在这一近似条件下，当等离子体各向异性轴、波矢量和模式磁场相互正交时，粒子分布函数和电磁场的空间模式（谐波）的一维和二维演化得到了一个封闭方程组。该方程组的数值解法与一维解析准线性理论在其适用范围内的现有结果以及粒子入胞法的二维模拟结果进行了比较，粒子入胞法还考虑了模态的直接四波相互作用。研究证实，在双麦克斯韦等离子体的一维和轴对称二维问题的最简单情况下，准线性现象在湍流非线性发展的相当长的阶段起着主导作用。我们注意到，在湍流衰减的后期阶段，以及在问题的更一般表述中，特别是在存在外部磁场的情况下，模式之间的直接非线性相互作用会与准线性现象同时出现。根据所进行的分析，揭示了某些非线性效应对魏伯尔湍流空间谱演变的贡献，并研究了这种湍流的特性，包括自相似性和不稳定模式动力学的不同阶段。

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引用次数: 0

Ghost Fiber Optic Endoscopy with Several Single-Pixel Detectors in the Object Arm 在物体臂上安装多个单像素探测器的幽灵光纤内窥镜

IF 1.1 4区物理与天体物理 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120038

D. A. Balakin, A. V. Belinsky

Abstract

We describe a new method for the formation of optical ghost images, in which radiation in the object arm is detected by several detectors. The advantage of the proposed method is demonstrated, which is the smaller number of illumination patterns required for reconstructing the object image as compared to traditional schemes of ghost imaging. We propose variants of algorithms for measurement reduction to the form relevant to the imaging of the object of investigation, which are aimed at improvement of the performance of the computing component of the endoscope. The fiber-optic version of ghost imaging considered here is suitable for investigating hard-to-reach abdomens and organs of human organism, which permit the introduction of a thin fiber-optic bundle, thus extending its applicability as compared to traditional optic endoscopic methods.

摘要我们介绍了一种形成光学鬼影的新方法，在这种方法中，物体臂上的辐射由多个探测器检测。与传统的鬼影成像方案相比，该方法的优势在于重建物体图像所需的照明模式数量更少。我们提出了一些算法变体，用于将测量减小到与调查对象成像相关的形式，目的是提高内窥镜计算组件的性能。这里所考虑的光纤版鬼影成像适用于调查难以触及的腹部和人体器官，因为它允许引入细光纤束，从而与传统的光学内窥镜方法相比扩大了其适用性。

引用次数: 0

Computational–Experimental Study of the Liquid Drop Fragmentation Caused by an Air Shock Wave 空气冲击波导致液滴破碎的计算-实验研究

IF 1.1 4区物理与天体物理 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120014

K. V. Anisiforov, A. B. Georgievskaya, E. V. Levkina, N. V. Nevmerzhitskii, V. A. Raevskii, E. D. Sen’kovskii, E. A. Sotskov

Abstract

The fragmentation of a drop of liquid (water, alcohol, glycerin) under the action of an air shock wave with a pressure of 0.2 and 3.2 atmg is studied experimentally and theoretically. The experiments are carried out using an air shock tube, and the liquid drop diameter is approximately 0.6 and 2 mm. The process is studied using high-speed video recording. Dispersed liquid particles from ≈5 μm in size are detected, liquid particle size distributions are plotted, and the particle velocities are determined. The experimental results are compared with the results of computational–theoretical estimation.

摘要通过实验和理论研究了液滴（水、酒精、甘油）在压力为 0.2 和 3.2 atmg 的空气冲击波作用下的破碎情况。实验使用空气冲击管进行，液滴直径约为 0.6 毫米和 2 毫米。使用高速视频记录对这一过程进行了研究。检测了大小为 ≈5 μm 的分散液体颗粒，绘制了液体颗粒大小分布图，并确定了颗粒速度。实验结果与计算理论估算结果进行了比较。

引用次数: 0

Reply to the Comment on the Article “On the Time Integral of Electromagnetic Field” (J. Exp. Theor. Phys. 136, 406 (2023)) 对 "论电磁场的时间积分"（J. Exp. Theor.136, 406 (2023))

IF 1.1 4区物理与天体物理 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120063

R. M. Feshchenko

Abstract

Reply to the comment on the article “On the time integral of electromagnetic field,” J. Exp. Theor. Phys. 136, 406 (2023)).

摘要回复对 "论电磁场的时间积分 "一文的评论，J. Exp. Theor.136, 406 (2023)).

引用次数: 0

Dynamics, Symmetry, and Shock-Induced Dusting at Quasi-Isentropic and Isentropic Acceleration of Cylindrical Liners 圆柱形衬垫在准等熵和等熵加速度下的动力学、对称性和冲击诱导的除尘

IF 1.1 4区物理与天体物理 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s106377612312018x

S. V. Erunov, V. A. Ogorodnikov, A. O. Blikov, V. N. Knyazev, E. V. Kulakov, A. B. Georgievskaya, N. B. Davydov, A. S. Sokolova, E. A. Chudakov, M. V. Zhernokletov, A. V. Romanov, I. A. Blinov, V. A. Arinin, M. V. Antipov, A. P. Yavtushenko

Abstract

Two devices intended for copper cylindrical liner gasdynamic acceleration to velocities of 5–7 km/s using the chemicals explosion energy have been investigated. It has been demonstrated that the acceleration of quasi-isentropically and isentropically loaded liners under the conditions of high-level dynamics, symmetry of deposition, and suppression of shock-induced dusting is feasible.

摘要研究了利用化学品爆炸能量将圆柱形铜衬垫气体动力加速到 5-7 千米/秒速度的两种装置。研究表明，在高动态、沉积对称和抑制冲击引起的粉尘的条件下，准等向和等向加载衬垫的加速是可行的。

引用次数: 0

Monte Carlo Simulation of Energy Dissipation during the Cascade Decay of Inner-Shell Vacancies in an Iron Atom Placed in Water 放置在水中的铁原子内壳空位级联衰变过程中能量耗散的蒙特卡洛模拟

IF 1.1 4区物理与天体物理 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120178

A. P. Chaynikov, A. G. Kochur, A. I. Dudenko

Abstract

We have performed the Monte Carlo simulation of the processes of secondary ionization of water induced by cascade decays of inner-shell vacancies in an iron atom placed in water. We have obtained the spectra of electrons and photons emitted during the decay of vacancies in the K and L shells of the iron atom. The dependences of the number of secondary ionization events and the energy absorbed as a result of these processes on the radius of the sphere in which such processes occur have been calculated. The decay of a single 1s vacancy in an iron atom generates on the average 232 events of secondary ionization induced by an electron impact, in which the energy of 3274 eV is absorbed, as well as 18 secondary photoionization events, in which the energy of 256 eV is absorbed. The dependences of the dose absorbed in water on the distance from the iron atom have been calculated.

摘要我们对置于水中的铁原子内壳空位级联衰变引起的水二次电离过程进行了蒙特卡罗模拟。我们获得了铁原子 K 和 L 壳空位衰变过程中发射的电子和光子的光谱。我们计算了二次电离事件的数量和这些过程所吸收的能量与发生这些过程的球体半径的关系。铁原子中单个 1s 空位的衰变平均会产生 232 次由电子撞击引起的二次电离事件，其中吸收了 3274 eV 的能量，以及 18 次二次光电离事件，其中吸收了 256 eV 的能量。已计算出水中吸收的剂量与铁原子距离的关系。

引用次数: 0

Search for a New Internucleon Interaction Using Neutron Powder Diffraction 利用中子粉末衍射寻找新的核子间相互作用

IF 1.1 4区物理与天体物理 Q3 Physics and Astronomy

Journal of Experimental and Theoretical Physics

Pub Date : 2024-01-26 DOI: 10.1134/s1063776123120166

V. V. Voronin, D. D. Shapiro, S. Yu. Semenikhin, T. C. Hansen

Abstract

The application of neutron powder diffraction to search for a new internucleon Yukawa-like interaction is considered. The essence of the method is in the investigation of dependency of the neutron scattering amplitude on the momentum transfer. The possible contributions to the scattering amplitude and to the integrated intensity of diffraction maxima were analyzed. The neutron diffraction experiment with silicon powder at D20 diffractometer of the ILL reactor (Grenoble, France) was performed. From the data obtained constraints on the coupling constant of the considered interaction were made. It is shown that in the interaction radius range of λ = 10^–13–10^—11 m they improve the values already existing in the literature. The result obtained is limited by imperfections of the experimental setup. Eliminating the instrumental contribution may allow increasing the sensitivity of the method by at least an order of magnitude.

摘要研究考虑了应用中子粉末衍射来寻找一种新的核内汤川样相互作用。该方法的本质在于研究中子散射振幅对动量传递的依赖性。分析了对散射振幅和衍射最大值综合强度的可能贡献。在 ILL 反应堆（法国格勒诺布尔）的 D20 衍射仪上对硅粉进行了中子衍射实验。根据获得的数据，对所考虑的相互作用的耦合常数进行了限制。结果表明，在 λ = 10-13-10-11 m 的相互作用半径范围内，它们改进了文献中已有的数值。获得的结果受到实验装置不完善的限制。消除仪器的贡献可能会使该方法的灵敏度提高至少一个数量级。

引用次数: 0

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数据库

全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

期刊

Journal of Experimental and Theoretical Physics

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