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Anomalous Oscillation Modes of Superfluid Pendant Droplets.
Phys Rev Lett
November 2024
Department of Applied Physics, Hokkaido University, Kita 13 Nishi 8, Kitaku, Sapporo, Hokkaido 060-8628, Japan.
Droplets should exhibit various dynamical phenomena when adhered to a surface; not all of them are realized in classical fluids. Visualization of superfluid ^{4}He pendant droplets revealed that the droplets were horizontally translated on a flat surface, bouncing off at the corner, known as the Noether mode that reflects the translation symmetry. The droplets exhibited another mode in vertical oscillations with high amplitude that included oscillation of the droplet edge.
View Article and Find Full Text PDFMetabolic interplay drives population cycles in a cross-feeding microbial community.
bioRxiv
October 2024
Department of Biomedical Engineering, University of Wisconsin-Madison; Madison, WI 53706, USA.
Population cycles are prevalent in ecosystems and play key roles in determining their functions. While multiple mechanisms have been theoretically shown to generate population cycles, there are limited examples of mutualisms driving self-sustained oscillations. Using an engineered microbial community that cross-feeds essential amino acids, we experimentally demonstrate cycles in strain abundance that are robust across environmental conditions.
View Article and Find Full Text PDFCoherent Phonon Dynamics in Plasmonic Gold Tetrahedral Nanoparticle Ensembles.
J Phys Chem Lett
September 2024
Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.
Coherent phonon modes supported by plasmonic nanoparticles offer prospective applications in chemical and biological sensing. Whereas the characterization of these phonon modes often requires single-particle measurements, synthetic routes to narrow size distributions of nanoparticles permit ensemble investigations. Recently, the synthesis of highly monodisperse gold tetrahedral nanoparticles with tunable edge lengths and corner sharpnesses has been developed.
View Article and Find Full Text PDFEP Corner: Oscillations.
Heart Rhythm
June 2024
Cardiovascular Division, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee.
The N-Oscillator Born-Kuhn Model: An In-Depth Analysis of Chiro-Optical Properties in Complex Chiral Systems.
Nanomaterials (Basel)
January 2024
Department of Mathematics, The University of Georgia, Athens, GA 30602, USA.
A comprehensive theory is developed for the chiral optical response of two configurations of the N-oscillator Born-Kuhn model (NOBK): the helically stacked and the corner stacked models. In the helical NOBK model, there is always a chiral response regardless of the value of , whereas in the corner NOBK, only configurations with even demonstrate a chiral response. Generally, the magnitudes of optical rotatory dispersion (ORD) and circular dichroism (CD) increase with when the parameters of each oscillator are fixed.
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