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CFD Analysis of Particle Dynamics in Accelerated Toroidal Systems for Enhanced PIVG Performance.
Micromachines (Basel)
November 2024
Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada.
This study investigates the movements of particles in an accelerated toroidal flow channel filled with water, with specific applications for a particle imaging velocimetry gyroscope (PIVG). We used computational fluid dynamics (CFD) to simulate particle behavior under different angular accelerations. These angular accelerations were 4 rad/s, 6 rad/s, and 8 rad/s for particles densities of 1100 kg/m, 1050 kg/m, and 980 kg/m.
View Article and Find Full Text PDFNumerical modeling of conventional spin-stop agitation of liquid drug products for automated visual inspection.
Int J Pharm
January 2025
Amgen Inc., Process Development, Manufacturing Technology Advancement (MTA) Group, Thousand Oaks, CA 91320, USA. Electronic address:
Article Synopsis
- The automated visual inspection (AVI) of liquid-filled vials and syringes in pharmaceutical production uses a spin-stop motion to detach particles for better detection.
- A validated numerical model for a specific glass vial was created to study how different agitation motions and liquid properties affect particle mobilization.
- Findings indicate that higher angular acceleration during agitation improves the wall shear stress distribution, enhancing particle detection, and the developed model can be adapted for various container types and liquids to optimize AVI processes.
Heterodyne analysis of high-order partial waves in attosecond photoionization of helium.
Nat Commun
January 2025
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China.
Partial wave analysis is key to interpretation of the photoionization of atoms and molecules on the attosecond timescale. Here we propose a heterodyne analysis approach, based on the delay-resolved anisotropy parameters to reveal the role played by high-order partial waves during photoionization. This extends the Reconstruction of Attosecond Beating By Interference of Two-photon Transitions technique into the few-photon regime.
View Article and Find Full Text PDFCreation of a stable vector vortex beam with dual fractional orbital angular momentum.
Sci Rep
January 2025
School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China.
Recently, vortex beams have been widely studied and applied because they carry orbital angular momentum (OAM). It is widely acknowledged in the scientific community that fractional OAM does not typically exhibit stable propagation; notably, the notion of achieving stable propagation with dual-fractional OAM within a single optical vortex has been deemed impracticable. Here, we address the scientific problem through the combined modulation of phase and polarization, resulting in the generation of a dual-fractional OAM vector vortex beam that can stably exist in free space.
View Article and Find Full Text PDFDistributed cortical regions for the recall of people, places and objects.
eNeuro
January 2025
Section on Learning and Plasticity, Laboratory of Brain and Cognition, National Institute of Mental Health, Bethesda, MD 20892-1366, USA.
Human medial parietal cortex (MPC) is recruited during multiple cognitive processes. Previously, we demonstrated regions specific to recall of people or places and proposed that the functional organization of MPC mirrors the category selectivity defining the medial-lateral axis of ventral temporal cortex (VTC). However, prior work considered recall of people and places only and VTC also shows object-selectivity sandwiched between face- and scene-selective regions.
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