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Shear-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 PDFSpatiotemporal imaging of nonlinear optics in van der Waals waveguides.
Nat Nanotechnol
January 2025
Department of Chemistry, Columbia University, New York, NY, USA.
Van der Waals (vdW) semiconductors have emerged as promising platforms for efficient nonlinear optical conversion, including harmonic and entangled photon generation. Although major efforts are devoted to integrating vdW materials in nanoscale waveguides for miniaturization, the realization of efficient, phase-matched conversion in these platforms remains challenging. Here, to address this challenge, we report a far-field ultrafast imaging method to track the propagation of both fundamental and harmonic waves within vdW waveguides with femtosecond and sub-50 nanometre spatiotemporal precision.
View Article and Find Full Text PDFSDES-YOLO: A high-precision and lightweight model for fall detection in complex environments.
Sci Rep
January 2025
College of Intelligence and Computing, Tianjin University, Tianjin, 300000, China.
Falling is an emergency situation that can result in serious injury or even death, especially in the absence of immediate assistance. Therefore, developing a model that can accurately and promptly detect falls is crucial for enhancing quality of life and safety. In the field of object detection, while YOLOv8 has recently made notable strides in detection accuracy and speed, it still faces challenges in detecting falls due to variations in lighting, occlusions, and complex human postures.
View Article and Find Full Text PDFAdjusting TADF and Phosphorescence for Tailored Dynamic Time-Dependent Afterglow Colored Carbon Dots spanning Full Visible Region.
Angew Chem Int Ed Engl
January 2025
Zhengzhou University, College of Chemistry and Molecular Engineering, CHINA.
Time-dependent afterglow colored (TDAC) behavior differs from static afterglow by involving wavelength changes, enabling low-cost, high-level encryption and anti-counterfeiting. However, the existing carbon dot (CD)-based TDAC materials lack a clear mechanistic explanation and controllable wavelength changes, significantly hindering the progress of practical applications in this field. In this study, we synthesized CDs composites with customizable tunable TDAC wavelengths across the visible region.
View Article and Find Full Text PDFPhoto-Driven Direct Construction of Imidazolidines from Anilines and Paraformaldehyde and Its Application in Polyoxymethylene Plastics Usage.
Chem Asian J
January 2025
Leibniz-Institut fur Katalyse eV, organmetallic and catalyst, Albert-Einstein-Str. 29a, 18059, Rostock, GERMANY.
Imidazolines play pivotal roles in numerous fields. However, the direct construction of imidazolines from primary amines involves precise C-C and C-N bond formations, rendering this area still underdeveloped to this day. Herein, a photo-driven metal-free catalytic system has been successfully applied to a novel coupling-cyclization reaction between arylamines and formaldehyde, enabling the direct synthesis of various 1,3-diarylimidazolines from primary amines.
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