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3,953 results
  • On-chip simultaneous rotation of large-scale cells by acoustically oscillating bubble array. [Journal Article]
    Biomed Microdevices 2020; 22(1):13Tang Q, Liang F, … Wang W
  • Bubbles locating in microfluidic chamber can produce acoustic streaming vortices by applying travelling surface acoustic wave oscillation in an ultrasonic range, which can be used to drive bio-samples to move within the flow field. In this paper, a strategy of bubble array configured in a large number of regularly arranged horseshoe structures is proposed to capture and rotate cells simultaneousl…
  • Quantitative Acoustic Models for Superfluid Circuits. [Journal Article]
    Phys Rev Lett 2019; 123(26):260402Gauthier G, Szigeti SS, … Neely TW
  • We experimentally realize a highly tunable superfluid oscillator circuit in a quantum gas of ultracold atoms and develop and verify a simple lumped-element description of this circuit. At low oscillator currents, we demonstrate that the circuit is accurately described as a Helmholtz resonator, a fundamental element of acoustic circuits. At larger currents, the breakdown of the Helmholtz regime is…
  • Photonic Topological Spin Hall Effect Mediated by Vortex Pairs. [Journal Article]
    Phys Rev Lett 2019; 123(26):266101Wang B, Maguid E, … Hasman E
  • Over the past decades, topology has provided unique insight into numerous physical phenomena. Here, we report on a topological mechanism for spin-dependent photonic transport. We observe photonic topological defects of bound vortex pairs and unbound vortices generated from a two-dimensional array of nanoantennas, i.e., a metasurface, which is achieved by randomly inserting local deformations in t…
  • Mixing Optimization in Grooved Serpentine Microchannels. [Journal Article]
    Micromachines (Basel) 2020; 11(1)Rhoades T, Kothapalli CR, Fodor PS
  • Computational fluid dynamics modeling at Reynolds numbers ranging from 10 to 100 was used to characterize the performance of a new type of micromixer employing a serpentine channel with a grooved surface. The new topology exploits the overlap between the typical Dean flows present in curved channels due to the centrifugal forces experienced by the fluids, and the helical flows induced by slanted …
  • Left Ventricular Vortices in Myocardial Infarction Observed with Echodynamography. [Journal Article]
    Conf Proc IEEE Eng Med Biol Soc 2019; 2019:5816-5819Oktamuliani S, Hasegawa K, Saijo Y
  • Echodynamography (EDG) is a computational method to deduce two-dimensional (2D) blood flow vector from conventional color Doppler ultrasound image by considering that the blood flow is divided into vortex and base flow components. Left ventricular (LV) vortices indicate cardiac flow status influenced by LV wall motion. Thus, quantitative assessment of LV vortices may become new and sensitive para…
  • Effect of asymmetry on the flow behavior in an idealized arterial bifurcation. [Journal Article]
    Comput Methods Biomech Biomed Engin 2020; :1-16Nagargoje M, Gupta R
  • Flow behavior at the arterial bifurcations has significant implications on the plaque formation. It depends on the vessel size, two bifurcation angles, i.e. angle between the mother and daughter vessels and their relative magnitudes. In this study, hemodynamics for steady and pulsatile flow of blood has been investigated in an idealized carotid artery bifurcation having all the vessels in the sam…
  • Systematic Scatterometer Wind Errors Near Coastal Mountains. [Journal Article]
    Earth Space Sci 2019; 6(10):1900-1914Kilpatrick T, Xie SP, … Hutchings N
  • Satellite scatterometers provide the only regular observations of surface wind vectors over vast swaths of the world oceans, including coastal regions, which are of great scientific and societal interest but still present challenges for remote sensing. Here we demonstrate systematic scatterometer wind errors near Hawaii's Big Island: Two counter-rotating lee vortices, which are clear in the Inter…
  • Chaos in Hamiltonian systems subjected to parameter drift. [Journal Article]
    Chaos 2019; 29(12):121105Jánosi D, Tél T
  • Based on the example of a paradigmatic low-dimensional Hamiltonian system subjected to different scenarios of parameter drifts of non-negligible rates, we show that the dynamics of such systems can best be understood by following ensembles of initial conditions corresponding to tori of the initial system. When such ensembles are followed, toruslike objects called snapshot tori are obtained, which…
  • Vortex-induced vibration wind energy harvesting by piezoelectric MEMS device in formation. [Journal Article]
    Sci Rep 2019; 9(1):20404Lee YJ, Qi Y, … Lua KB
  • A silicon chip integrated microelectromechanical (MEMS) wind energy harvester, based on the vortex-induced vibration (VIV) concept, has been designed, fabricated, and tested as a proof-of-concept demonstration. The harvester comprises of a cylindrical oscillator attached to a piezoelectric MEMS device. Wind tunnel experiments are conducted to measure the power output of the energy harvester. Addi…
  • Spray dedusting scheme under hybrid ventilation at a fully mechanized excavation face. [Journal Article]
    Environ Sci Pollut Res Int 2019Yu H, Cheng W, … Peng H
  • In order to evaluate the dust suppression performance with a spraying system at the fully mechanized excavation face, an airflow-droplet-dust multiphase coupling model was established based on the Eulerian-Lagrangian method. Subsequently, the model's accuracy was validated experimentally using a self-developed system for measuring dust suppression efficiency. For the pressure/exhaust hybrid venti…
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