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An efficiency improvement method for high-voltage nanosecond pulse spiral generator based on optimized voltage wave propagation process.
Rev Sci Instrum
January 2025
School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
The spiral generator, based on the principle of the electric field vector inversion, is capable of delivering repetitive high-voltage nanosecond pulses in the commercial portable pulsed x-ray source and gas switch trigger source. However, the spiral generator suffers from extremely low output efficiency, which significantly affects the compactness and accelerates the insulation film breakdown at electrode foil edges since the high charging voltage is required. A novel output efficiency improvement method for the spiral generator was proposed, implementing the permalloy film inside the passive layer to optimize internal voltage wave propagation processes during the pulser erection.
View Article and Find Full Text PDFOrientation-selective spin-polarized edge states in monolayer NiI.
Nat Commun
December 2024
Institute of Physics, Chinese Academy of Sciences, Beijing, China.
Spin-polarized edge states in two-dimensional materials hold promise for spintronics and quantum computing applications. Constructing stable edge states by tailoring two-dimensional semiconductor materials with bulk-boundary correspondence is a feasible approach. Recently layered NiI is suggested as a two-dimensional type-II multiferroic semiconductor with intrinsic spiral spin ordering and chirality-induced electric polarization.
View Article and Find Full Text PDFStudy on Recovery Strategy of Hearing Loss & SGN Regeneration Under Physical Regulation.
Adv Sci (Weinh)
December 2024
Department of Neurology, Aerospace Center Hospital, School of Life, Beijing Institute of Technology, Beijing, 100081, China.
The World Health Organization (WHO) reports that by 2050, nearly 2.5 billion people are expected to have some degree of hearing loss (HL) and at least 700 million will need hearing rehabilitation. Therefore, there is an urgent need to develop treatment strategies for HL.
View Article and Find Full Text PDFMagnetic resonance acoustic radiation force imaging (MR-ARFI) is an exceptionally promising technique to non-invasively confirm targeting accuracy and estimate exposure of low-intensity transcranial focused ultrasound stimulation. MR-ARFI uses magnetic field motion encoding gradients to visualize the MR phase changes generated by microscopic displacements at the ultrasound focus. Implementing MR-ARFI in the human central nervous system has been hindered by 1) phase distortion caused by subject motion, and 2) insufficient signal-to-noise ratio at low (<1.
View Article and Find Full Text PDFAnalysis of the Radial Force of a Piezoelectric Actuator with Interdigitated Spiral Electrodes.
Micromachines (Basel)
November 2024
School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471003, China.
The actuator is a critical component of the micromanipulator. By utilizing the properties of expansion and contraction, the piezoelectric actuator enables the manipulator to handle and grasp miniature objects during micromanipulation. However, in piezoelectric ceramic disc actuators with conventional surface electrode configurations, the actuating force generated in the radial direction is relatively limited.
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