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Limiting and optimal Strouhal numbers or tip speed ratios for cruising propulsion by fins, flukes, wings and propellers.
J R Soc Interface
January 2025
Structure and Motion Laboratory, The Royal Veterinary College, North Mymms, Hatfield AL9 7TA, UK.
Swimming and flying animals produce thrust with oscillating fins, flukes or wings. The relationship between frequency , amplitude and forward velocity can be described with a Strouhal number , where = 2/, where animals are observed to cruise with [Formula: see text]-0.4.
View Article and Find Full Text PDFEngineering Polar Vortices via Strain Soliton Interactions in Marginally Twisted Multilayer Graphene.
Nano Lett
January 2025
National Laboratory of Solid-State Microstructures, School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, Jiangsu, China.
Strain solitons have been widely observed in van der Waals materials and their heterostructures. They can manifest as one-dimensional (1D) wires and quasi-two-dimensional (2D) networks. However, their coexistence within the same region has rarely been observed, and their interplay remains unexplored.
View Article and Find Full Text PDFStripe charge order and its interaction with Majorana bound states in 2M-WS topological superconductors.
Natl Sci Rev
February 2025
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
To achieve logic operations via Majorana braiding, positional control of the Majorana bound states (MBSs) must be established. Here we report the observation of a striped surface charge order coexisting with superconductivity and its interaction with the MBS in the topological superconductor 2M-WS, using low-temperature scanning tunneling microscopy. By applying an out-of-plane magnetic field, we observe that MBSs are absent in vortices in the region with stripe order.
View Article and Find Full Text PDFMulti-Vortex Regulation in a Simple Semicircular Microchannel with Ordered Micro-Obstacles for High-Throughput Buffer Exchange.
Anal Chem
January 2025
Shanxi Key Lab for Modernization of TCVM, College of Veterinary Medicine, Shanxi Agricultural University, Taiyuan 030000, Shanxi, P. R. China.
Microfluidics is an emerging technology for buffer exchange in bioprocessing applications. However, achieving buffer exchange with simplicity of operation and high throughput in a straightforward channel design remains a challenge. This study presents a novel semicircular microchannel design that allows for the deterministic regulation of helical and Dean vortices through geometric confinement.
View Article and Find Full Text PDFPolar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere.
Nat Commun
January 2025
Space and Earth Observation Centre, Finnish Meteorological Institute, Helsinki, Finland.
Solar driven energetic particle precipitation (EPP) is an important factor in polar atmospheric ozone balance and has been linked to ground-level regional climate variability. However, the linking mechanism has remained ambiguous. The observed and simulated ground-level changes start well before the processes from the main candidate, the so-called EPP-indirect effect, would start.
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