The Geometry of Black Hole Singularities by Ovidiu Cristinel Stoica

“…The charged black holes turn out to have smooth potential and electromagnetic fields in the new atlas. Classical charged particles can be modeled, in General Relativity, as charged black hole solutions. …”
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Design of amplifying information metasurface for enhancing signal coverage by Lijie WU, Hanqing YANG, Qiang CHENG, Tiejun CUI

“…Traditional information metasurfaces can be used in wireless relay systems to control the propagation direction of electromagnetic waves due to their capability to control the amplitude and phase.However, owing to the lack of signal amplification function, these metasurfaces have a limited operating distance.Thus, a large size of metasurfaces is usually demanded to realize the signal coverage of dead zones.To solve this problem, an amplifying information metasurface was designed to realize the 2 bit phase manipulation and signal amplification function within the broad band from 2.7 to 3.1 GHz.Furthermore, a power dividing and combining network was introduced to combine the 1×8 metasurface elements into an array with only one amplifier, which greatly reduced the number of amplifiers, the hardware cost, and the power consumption.The simulation results indicate that the array can realize beamforming and signal amplification over a broad band.Therefore, the proposed amplifying information metasurface array may find important applications in wireless relay systems and provide a new solution to enhancing the signal coverage and reducing the size of the metasurface array.…”
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Spatial localization and diffusion of Dirac particles and waves induced by random temporal medium variations by Seulong Kim, Kihong Kim

“…While most research has focused on electromagnetic waves, studies on Dirac-type waves remain limited. …”
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Corrigendum to “Opto-mechanical-thermal integration design of the primary optical system for a tri-band aviation camera” [Measure. PE 242 (2025) 116319] by Kailin Zhang, Yue Pan, Xiping Xu, Liang Xu, Wancheng Liu, Motong Hu, Yi Lu, Yajie Cao

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A Multilevel Inverter Bridge Control Structure with Energy Storage Using Model Predictive Control for Flat Systems by Paolo Mercorelli

“…The paper presents a novel technique to control the current of an electromagnetic linear actuator fed by a multilevel IGBT voltage inverter with dynamic energy storage. …”
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Terahertz wave propagation and channel characterization by Haofan YI, Ke GUAN, Danping HE, Bo AI, Zhengrong LAI, Zhangdui ZHONG

“…Firstly, the different characteristics of terahertz waves compared to lower frequency bands were summarized, including the influence of meteorological factors and rough surfaces of materials on THz waves.Next, it was proposed to use ray-tracing (RT) technology to calibrate the three-dimensional (3D) environment model and electromagnetic parameters of materials in the target scenarios through very limited channel measurement data.Then, the reversed parameters were utilized to perform in a similar but more general scenario, instead of a large amount of channel measurement data.Finally, the channel characteristics were analyzed by extraction of the channel key parameters, such as path loss, shadow fading, Rician K-factor, delay spread, angular spread, and doppler parameters in a mobile scenario.Representing two ends of 6G THz use cases from indoor scenario to outdoor scenario, case studies were made for wireless connections on a desktop and vehicular communications, respectively.As for the outdoor scenario, the influences of meteorological factors were additionally considered.The work is of great significance for the design and evaluation of the THz communication system.…”
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Detection of opening motion characteristics in DC circuit breakers based on machine vision. by Zhaoyu Ku, Jinjin Li, Dongheng Li, Huajun Dong

“…A circuit breaker is a crucial component in power systems, and its operation is essential for evaluating its interruption performance. However, electromagnetic interference often affects sensor accuracy. …”
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Ultra-wideband array antenna in 5G and its miniaturization technology by Shenke ZHANG, Fengxu YANG, Yingzeng YIN

“…The results of full wave electromagnetic simulation software show that the impedance bandwidth of voltage stranded ratio less than 2. 0 was from the frequency range of 1. 1 GHz to 2. 8 GHz, with a height of 24 mm and corresponding to a fractional bandwidth of 78. 0%. …”
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RIS-assisted multi-user beam tracking system and hardware experiment by DING Chenlong, XU Wenjun, ZHANG Hongtao

“…Reconfigurable intelligent surface (RIS) effectively improves the performance of 6G communication systems by intelligently controlling the electromagnetic propagation path. However, the integration of a large number of reflecting elements in RIS increases the complexity of multi-beam control and enlarges the codebook search space, leading to insufficient real-time control capabilities and difficulties in multi-user beam tracking. …”
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Field Equations and Lagrangian of the Kaluza Energy-Momentum Tensor by L. L. Williams

“…In addition to the effects of a scalar field expected from other scalar-tensor or scalar-electromagnetic theories, a peculiar Kaluza coupling coefficient arises for charged matter which acts to vary the source strengths in ways unknown to conventional physics. …”
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Direct effectiveness of adding local hyperthermia to the scheme of neoadjuvant chemoradiotherapy for locally advanced rectal cancer by S. A. Ivanov, L. O. Petrov, D. V. Erygin, I. A. Gulidov, A. A. Karpov

“…Direct evaluation of the antitumor effectiveness of neoadjuvant chemoradiotherapy for rectal cancer using local electromagnetic hyperthermia. Materials and methods. The analysis of the direct results of treatment of patients with locally advanced rectal cancer in the clinic of the MRRC them. …”
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Meteorological Anomalies During Earthquake Preparation: A Case Study for the 1995 Kobe Earthquake (M = 7.3) Based on Statistical and Machine Learning-Based Analyses by Masashi Hayakawa, Shinji Hirooka, Koichiro Michimoto, Stelios M. Potirakis, Yasuhide Hobara

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New dimension in vortex electro-magnetic wave transmission with orbital angular momentum by Chao ZHANG, Yuanhe WANG

“…Conclusion:In response to the controversy on whether OAM electromagnetic waves can provide the new dimension for the wireless transmission, this paper analyzes the physical insight of the EM wave transmission with OAM in history.It can be concluded that:both the intrinsic OAM and the extrinsic OAM can be utilized by EM waves,but only quantum OAM vortex microwave photons transmission based on intrinsic OAM can generate new dimensions in the wireless transmission besides the MIMO transmission. …”
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Evaluation of magnetic resonance thermometry performance during MR-guided hyperthermia treatment of soft-tissue sarcomas in the lower extremities and pelvis by Spyridon N. Karkavitsas, Marianne Göger-Neff, Maria Kawula, Kemal Sumser, Benjamin Zilles, Martin Wadepohl, Guillaume Landry, Christopher Kurz, Wolfgang G. Kunz, Olaf Dietrich, Lars H. Lindner, Margarethus M. Paulides

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Design and Fabrication of Flexible Nanoantenna-Based Sensor Using Graphene-Coated Carbon Cloth by Senthil Kumar Kandasamy, S. Maheswaran, S. Anbu Karuppusamy, J. Indra, R. Anand, P. Rega, A. Kavitha, K. Immanuvel Arokia James, Kasthuri Nehru, K. Kathiresan

“…To design and simulate the antenna, Analysis System (ANSYS) electromagnetic desktop software was used. Using the designed graphene antenna, the parameters such as voltage standing wave ratio, three-dimensional radiation pattern, and directivity were obtained. …”
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Design, Fabrication, and Testing of Active Skin Antenna with 3D Printing Array Framework by Jinzhu Zhou, Haitao Li, Le Kang, Baofu Tang, Jin Huang, Zhiheng Cai

“…An active skin antenna with structural load-bearing and electromagnetic functions is usually installed in the structural surface of mobile vehicles such as aircrafts, warships, and high-speed train. …”
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Frequency-Dependent Streaming Potential of Porous Media—Part 1: Experimental Approaches and Apparatus Design by P. W. J. Glover, J. Ruel, E. Tardif, E. Walker

“…We conclude that the electromagnetic drive is currently the only approach that is practicable, while the piezoelectric drive may be useful for low permeability samples and at specified high frequencies. …”
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Indoor terminal localization technology using a single access point based on distributed MIMO networks by Ze LI, Jian ZOU, Zeng HUANG, Zengshan TIAN

“…Regarding the terminal localization in distributed MIMO networks, an indoor terminal localization system using a single access point (AP) based on distributed MIMO networks was proposed.Firstly, the AP’s antennas were arranged at different locations in the room, and the compressed sensing algorithm was used to estimate the angle of departure (AoD) and time of flight (ToF) of the receiving path on each antenna of the terminal device.Secondly, AoDs and ToFs of multiple paths were combined to establish a nonlinear localization model, and an improved Levenberg-Marquardt algorithm was used to solve the problem.Then, theoretical analysis has been examined for the factors that influence the localization error, and the criteria for the antenna layout was provided.Finally, electromagnetic simulation software was used to build simulation environment and conducted the simulation for system verification.Moreover, software-defined radio platforms were used to conduct practical tests.Both simulation and experimental results indicate that the performance of the proposed localization system is superior to existing single-AP localization systems based on natural multipath.…”
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Propagation Characteristics and Magnetic Field Distribution of Rotating Magnet-Based Mechanical Antenna in the Air-Seawater-Seabed Three-Layer Medium by S. P. Chen, Q. Zhou, J. Y. Zhang, S. Y. Wang

“…Aiming at the application requirements of underwater cross-domain communication, based on the equivalent relationship between the rotating permanent magnet and the orthogonal time-varying current loop, this paper establishes an air-seawater-seabed three-layer medium model and analyzes the magnetic field distribution and propagation characteristics of the rotating permanent magnet-based mechanical antenna (RMBMA). Based on the electromagnetic field simulation software FEKO, the influence of vertical rotation and horizontal rotation of RMBMA on the radiation magnetic field is analyzed. …”
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Angle-controlled strong and weak coupling in photon molecules by Feng Xiao, Xiaoqiuyan Zhang, Yueying Wang, Xingxing Xu, Tianyu Zhang, Min Hu

“…Abstract Strong light-matter coupling occurs when the rate of energy exchange between the electromagnetic mode and the molecular ensemble exceeds the competitive dissipation process. …”
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