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Fast and Efficient Method to Calculate Electric Fields as Applied to Topology Optimization of Microdevices 应用于微器件拓扑优化的快速高效电场计算方法
IF 0.5 4区 计算机科学 Q4 Physics and Astronomy Pub Date : 2023-12-13 DOI: 10.1134/s106422692310011x
Iu. B. Minin

Abstract

A new numerical approach is proposed for fast and efficient calculation of electric waves passing through wave microdevices using the Helmholtz equation. The efficiency, speed, and accuracy of the method are investigated.

摘要提出了一种利用亥姆霍兹方程快速有效地计算通过波微器件的电磁波的新方法。研究了该方法的效率、速度和准确性。
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引用次数: 0
Flux of High-Energy Positive Oxygen Ions from Plasma to a Substrate in a Pulsed Magnetron Discharge with a Hot Target 热靶脉冲磁控管放电中等离子体中的高能正氧离子到基底的通量
IF 0.5 4区 计算机科学 Q4 Physics and Astronomy Pub Date : 2023-12-13 DOI: 10.1134/s1064226923100078
D. V. Kolodko, A. V. Kaziev, D. G. Ageichenkov, V. Yu. Lisenkov

Abstract

A group of high-energy positive O+ ions in a plasma flow from a high-current pulsed magnetron discharge with a hot target in an Ar/O2 gas mixture. The mechanism of occurrence of accelerated O+ ions is the conversion of negative ions accelerated in the cathode layer O → O+ in the processes of charge exchange or ionization by electron impact.

在Ar/O2混合气体中,带热靶的大电流脉冲磁控管放电等离子体中存在一组高能正O+离子。加速O+离子发生的机理是在电荷交换或电子冲击电离过程中,阴极层中加速的负离子O -→O+的转化。
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引用次数: 0
Influence of Noise and Frequency Distortions in a Communication Channel on a Communication Scheme Based on a Hyperbolic Chaos Generator 通信信道中的噪声和频率失真对基于双曲混沌发生器的通信方案的影响
IF 0.5 4区 计算机科学 Q4 Physics and Astronomy Pub Date : 2023-12-13 DOI: 10.1134/s1064226923100108
D. O. Lyubchenko, O. B. Isaeva

Abstract

The article analyses the effectiveness of a chaotic communication scheme based on synchronization of hyperbolic chaos generators used as a receiver and a transmitter. It is shown that useful information nonlinearly mixed into the transmitter signal can be detected by the receiver if the receiver has stable synchronization with the transmitted signal. Research, aimed to confirm the hypothesis that robustness, strong chaoticity and noise-like wideband spectrum of this type of oscillators provide reliability and stability of transmission, has been carried out. This study also shows the effect of noise and frequency distortion of the signal in a communication channel on the quality of information detection.

摘要本文分析了双曲型混沌发生器同步作为接收和发送的混沌通信方案的有效性。研究表明,如果接收机与发射信号保持稳定的同步,则接收机可以检测到非线性混合在发射信号中的有用信息。研究旨在证实这类振荡器的鲁棒性、强混沌性和类噪声宽带频谱提供传输可靠性和稳定性的假设。本研究还显示了通信信道中信号的噪声和频率畸变对信息检测质量的影响。
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引用次数: 0
Sixteen-Channel 1920 Gbps Full-Duplex Optical Fiber Coherent Communication System Based on Dual Polarization-64 Quadrature Amplitude Modulation for 5G Fronthaul 基于双偏振-64 正交调幅的 16 通道 1920 Gbps 全双工光纤相干通信系统,用于 5G 前传
IF 0.5 4区 计算机科学 Q4 Physics and Astronomy Pub Date : 2023-12-01 DOI: 10.1134/s106422692312001x

Abstract

This article presents a bidirectional optical fiber communication system employing Dual Polarization-64 Quadrature Amplitude Modulation and Digital Signal Processing (DP-64QAM and DSP). With sixteen channels operating at 120 Gb/s each, the system achieves a total capacity of 1920 Gbps. OptiSystem V.19 software simulations confirm compliance with ITU-T 5G fronthaul requirements in G-series Recommendations-Supplement 66. Performance evaluation focuses on Bit Error Rate (BER), incorporating an Optical Signal-to-Noise Ratio (OSNR) and an adaptable optical span. Simulation results establish the system’s suitability as an F1 and Fx 5G fronthaul link for functional splits of 1 to 7c, aligning with ITU-T stipulations (<120 Gbps per channel). The design employs a bidirectional single-mode optical fiber for up to 13 km and 13.5 km distances in downlinks and uplinks. Incorporating two Dispersion Compensator Filters (DCFs) extends this to 19.5 km. This enhancement underscores the adaptability for real-world applications, particularly in extended-range scenarios necessitating robust and high-capacity communication links.

摘要 本文介绍了一种采用双偏振-64 正交调幅和数字信号处理(DP-64QAM 和 DSP)的双向光纤通信系统。该系统有 16 个通道,每个通道的工作速率为 120 Gb/s,总容量达到 1920 Gbps。OptiSystem V.19 软件模拟证实符合 ITU-T 5G 前传要求(G 系列建议-补充 66)。性能评估的重点是比特误码率(BER),包括光信噪比(OSNR)和可适应的光跨度。仿真结果表明,该系统适用于 F1 和 Fx 5G 前传链路,功能分频为 1 至 7c,符合 ITU-T 规定(每信道 120 Gbps)。设计采用双向单模光纤,下行链路和上行链路的距离分别可达 13 千米和 13.5 千米。采用两个色散补偿滤波器(DCF)后,传输距离可延长至 19.5 公里。这一改进凸显了其在实际应用中的适应性,特别是在需要强大和高容量通信链路的延伸范围应用中。
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引用次数: 0
Indistinguishability of Traffic by Open TLS Parameters with Encrypted ClientHello 通过加密 ClientHello 的开放 TLS 参数区分流量
IF 0.5 4区 计算机科学 Q4 Physics and Astronomy Pub Date : 2023-12-01 DOI: 10.1134/s1064226923120173

Abstract

Traffic Classification (TC) is a key part of many network frameworks that provide Quality of Service (QoS) for traffic. Encrypted TC algorithms often use the Server Name Indication (SNI) field, which indicates the domain name of the server to which the client establishes a connection, and which is a clear marker of the traffic category. However, the new Encrypted ClientHello (ECH) extension, which supplements the TLS 1.3 protocol significantly complicates TC because most of the messages of the TLS handshake become encrypted, including SNI. With ECH, the accuracy of TC algorithms that use open TLS parameters significantly degrades. This paper studies the indistinguishability of the encrypted traffic considering the remaining open TLS parameters.

摘要 流量分类(TC)是许多为流量提供服务质量(QoS)的网络框架的关键部分。加密 TC 算法通常使用服务器名称指示(SNI)字段,该字段表示客户端与之建立连接的服务器的域名,是流量类别的明确标记。然而,作为 TLS 1.3 协议的补充,新的加密客户问候(ECH)扩展使 TC 变得更加复杂,因为 TLS 握手过程中的大部分信息(包括 SNI)都被加密了。有了 ECH,使用开放 TLS 参数的 TC 算法的准确性大大降低。考虑到剩余的开放 TLS 参数,本文研究了加密流量的不可区分性。
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引用次数: 0
Deformation of a Dielectric Drop in Water under Microsecond Current Pulses 微秒级电流脉冲下水中介质滴的变形
IF 0.5 4区 计算机科学 Q4 Physics and Astronomy Pub Date : 2023-12-01 DOI: 10.1134/s1064226923140140

Abstract

Particle Image Velocimetry (PIV) is used to study the nonstationary flow pattern around a drop of a dielectric liquid of dibutyl phthalate surrounding water of weak conductivity under the action of a microsecond current pulse. It has been found that the time of existence of the induced vortex flow in water significantly exceeds the duration of the current pulse. During the action of the pulse, only small perturbations develop on the surface of the drop, while the final perturbations of the surface develop at much longer times, exceeding the duration of the current pulse by two or more orders of magnitude, and are associated with the evolution of the water flow around the drop. It is shown that the value of the maximum velocity in the induced water flow is affected by the potential of the needle at a constant duration and amplitude of the current.

摘要 粒子图像测速仪(PIV)用于研究在微秒级电流脉冲作用下,弱电导率水周围邻苯二甲酸二丁酯介电液体液滴的非稳态流动模式。研究发现,水中诱导涡流的存在时间大大超过了电流脉冲的持续时间。在脉冲作用期间,水滴表面只发生微小的扰动,而表面的最终扰动发生的时间要长得多,超过电流脉冲持续时间两个数量级或更多,并且与水滴周围水流的演变有关。研究表明,在电流持续时间和振幅不变的情况下,诱导水流的最大速度值受针的电位影响。
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引用次数: 0
Global Refinement Algorithm for 3D Scene Reconstruction from a Sequence of Point Clouds 根据点云序列重建三维场景的全局细化算法
IF 0.5 4区 计算机科学 Q4 Physics and Astronomy Pub Date : 2023-12-01 DOI: 10.1134/s1064226923120124

Abstract—Point cloud registration is a central problem in many computer vision problems. However, ensuring global consistency of the results of pairwise registration of point clouds is still a challenge when there are multiple clouds because different scans should be converted to a common coordinate system. This paper describes a global refinement algorithm that first estimates rotations and then estimates parallel translations. For global refinement of rotations, a closed-form algorithm based on matrices is used. For global refinement of parallel translations, a closed-form algorithm is also used. The proposed algorithm is compared with other global refinement algorithms.

摘要--点云注册是许多计算机视觉问题的核心问题。然而,当存在多个点云时,要确保点云配对注册结果的全局一致性仍是一个挑战,因为不同的扫描应转换到一个共同的坐标系。本文介绍了一种全局细化算法,该算法首先估算旋转,然后估算平行平移。对于旋转的全局细化,采用了基于矩阵的闭式算法。对于平行平移的全局细化,也采用了闭式算法。将所提出的算法与其他全局细化算法进行了比较。
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引用次数: 0
Dependence of Reversible and Irreversible Failures of Semiconductor Devices on the Repetition Rate of Powerful Pulse Electromagnetic Interferences 半导体器件的可逆和不可逆故障与强脉冲电磁干扰重复率的关系
IF 0.5 4区 计算机科学 Q4 Physics and Astronomy Pub Date : 2023-12-01 DOI: 10.1134/s1064226923120197

Abstract

Mechanisms of reversible and irreversible failures that occur in microwave semiconductor devices, microcircuits, and microprocessors under the impact of powerful electromagnetic pulses, either single or periodic, are analyzed. It is shown that, in microprocessors, failures of both types are generated by the electrothermal instabilities, being developed within negligibly small volumes of a device. The dependences of the threshold energy of failures on the pulse amplitude, duration, and repetition rate are explained. The results of the calculation are consistent with the experimental data.

摘要 分析了微波半导体器件、微电路和微处理器在单次或周期性强电磁脉冲影响下发生可逆和不可逆故障的机理。结果表明,在微处理器中,这两种类型的故障都是由电热不稳定性引起的,并在设备可忽略的小体积内产生。故障阈值能量与脉冲振幅、持续时间和重复率的关系得到了解释。计算结果与实验数据一致。
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引用次数: 0
Investigation of Characteristics of MIS Structures Based on MBE n-HgCdTe NBνN Barrier Structures by Admittance Spectroscopy 基于MBE n-HgCdTe NBνN势垒结构的MIS结构特性的导纳光谱研究
IF 0.5 4区 计算机科学 Q4 Physics and Astronomy Pub Date : 2023-11-16 DOI: 10.1134/s1064226923090279
A. V. Voitsekhovskii, S. M. Dzyadukh, D. I. Gorn, S. A. Dvoretskii, N. N. Mikhailov, G. Yu. Sidorov, M. V. Yakushev

Abstract

This study is devoted to the study of metal–insulator–semiconductor (MIS) structures based on n-HgCdTe (MCT) grown by molecular beam epitaxy (MBE) in the NBνN configuration, intended for the development of infrared (IR) detectors with reduced dark currents for MWIR and LWIR spectral ranges. Seven types of MIS structures have been studied by the admittance spectroscopy method. It is shown that the measurements of the frequency dependences of the impedance of MIS devices make it possible to accurately determine the differential resistance of the barrier structure. It has been established that for one of the studied structures, the values of the differential resistance are determined by the bulk component of the dark current, while the surface leakage component does not significantly affect the measured impedance. It is shown that if the problem of passivation of mesa structures is solved, it is possible to fabricate efficient MWIR and LWIR nBn, NBνN detectors based on MBE HgCdTe with high threshold parameters.

摘要本研究主要研究n-HgCdTe (MCT)在nν n结构下的分子束外延生长的金属-绝缘体-半导体(MIS)结构,旨在开发在MWIR和LWIR光谱范围内具有较低暗电流的红外(IR)探测器。用导纳光谱法研究了7种MIS结构。结果表明,测量MIS器件阻抗的频率依赖性可以准确地确定势垒结构的差分电阻。研究结果表明,其中一种结构的差分电阻值由暗电流的体积分量决定,而表面漏电分量对测量阻抗没有显著影响。结果表明,如果解决了平台结构的钝化问题,就有可能基于高阈值参数的MBE HgCdTe制备高效的MWIR和LWIR nBn, NBνN探测器。
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引用次数: 0
Electromagnetic Waves in a Tangentially Magnetized One-Side Metallized Bigyrotropic Layer (Example of Calculating the Spin Wave Characteristics) 切向磁化单面金属化双涡旋层中的电磁波(计算自旋波特性的实例)
IF 0.5 4区 计算机科学 Q4 Physics and Astronomy Pub Date : 2023-11-16 DOI: 10.1134/s1064226923090152
E. H. Lock, S. V. Gerus

Abstract

The problem of arbitrary propagation of electromagnetic waves in a tangentially magnetized one-side metallized bigyrotropic layer is solved without using the magnetostatic approximation. It is shown that, in this problem, Maxwell’s equations are reduced to a differential equation corresponding to a biquadratic characteristic equation with four roots kx21, ‒kx21, kx22, and –kx22 describing the distribution of the wave in the layer cross section. A dispersion equation for describing waves with real kx21 and kx22 values is obtained. Using this equation, the characteristics of spin waves in a one-side metallized ferrite plate (a special case of a bigyrotropic layer) are calculated for the frequencies above the ferromagnetic resonance frequency. It is found for these waves that quantity kx21 can take both real and imaginary values, while quantity kx22, only real ones. It is found that, at a certain frequency, the spin wave has an isofrequency curve almost identical to a straight line.

摘要在不使用静磁近似的情况下,解决了电磁波在切向磁化的单面金属化双涡旋层中的任意传播问题。结果表明,在该问题中,麦克斯韦方程组被简化为一个微分方程,对应于一个具有四根kx21、-kx21、kx22和-kx22的双二次特征方程,描述了波在层截面上的分布。得到了描述具有kx21和kx22实值的波的色散方程。利用该方程,计算了单面金属化铁氧体板(双涡旋层的特例)在铁磁共振频率以上的自旋波特性。我们发现对于这些波,kx21可以取实值和虚值,而kx22只能取实值。结果表明,在一定频率下,自旋波具有一条近似于直线的同频曲线。
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引用次数: 0
期刊
Journal of Communications Technology and Electronics
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