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Motion analysis of and experimental research on a magnetic and elastic coupling oscillation system.
Heliyon
July 2024
School of Physics, Changchun University of Science and Technology, Changchun, 130022, China.
To analyze the motion laws of a magnetic and elastic coupling system under the influence of various factors, this paper proposes a magnetic coupling pendulum based on spring pieces and magnets-a magnetic-mechanical oscillator. By fixing spring pieces onto two non-magnetic bases and attaching magnets to their upper ends, which repel each other, the potential energy during oscillation is expanded using Fourier series. Subsequently, Lagrange equations are solved to study the effects of the first two terms of potential energy.
View Article and Find Full Text PDFTuneable, variable, optical attenuation through an optical circulator with a broad, linear attenuation range of Δ ∼ (30-40) dB is demonstrated using non-reciprocal Faraday rotation in a double-pass configuration with a combination of permanent magnets and an electromagnet. A fiber-coupled magneto-optical variable optical attenuator (MVOA) operates over the near IR with an attenuation tuning range of Δ > 30 dB, a resolution of Δ ∼ 0.02 dB, a response time of < 2 ms, and a temperature dependence over = 25-70°C of Δ / Δ = -8 × 10 dB/°C.
View Article and Find Full Text PDFShear-Mediated Stabilization of Spin Spiral Order in Multiferroic NiI.
Adv Mater
January 2025
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
Type-II multiferroicity from non-collinear spin order is recently explored in the van der Waals material NiI. Despite the importance for improper ferroelectricity, the microscopic mechanism of the helimagnetic order remains poorly understood. Here, the magneto-structural phases of NiI are investigated using resonant magnetic X-ray scattering (RXS) and X-ray diffraction.
View Article and Find Full Text PDFPurpose: To create tridimensional (3D) anatomical models of diaphyseal fractures in dogs (3D AMDFD) and to evaluate the models from their radiographs.
Methods: The study consisted of six stages: preparation of femur from a healthy dog cadaver; digitalization of the bone through a 3D scanner and creation of the base model; creation of a 3D AMDFD based on the image of the base model, 3D modeling carried out to reproduce five different types of diaphyseal fractures; printing the models produced on a 3D printer with a thermoplastic material; insertion of neodymium magnets in the fracture line to allow the assembly and disassembly of the parts; and radiography of 3D AMDFD in lateromedial and craniocaudal positions.
Results: The base model and 3D AMDFD had high precision in the replication of bone structures, like the bone in natura.
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