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51,865 results
  • Reaction Acceleration in Electrospray Droplets: Size, Distance, and Surfactant Effects. [Journal Article]
    J Am Soc Mass Spectrom 2019; 30(10):2022-2030Marsh BM, Iyer K, Cooks RG
  • Phenylhydrazone formation from isatin is used to examine the effects on the reaction rate of (i) electrospray emitter distance from the mass spectrometer (MS) inlet, (ii) emitter tip diameter, and (iii) presence of surfactant. Reaction rates are characterized through measurement of conversion ratios. It is found that there is an increase in the conversion ratio as (i) the electrospray source is m…
  • THz Generation from Relativistic Plasmas Driven by Near- to Far-Infrared Laser Pulses. [Journal Article]
    Phys Rev Lett 2019; 123(26):264801Déchard J, Davoine X, Bergé L
  • Terahertz pulse generation by ultraintense two-color laser fields ionizing gases with near- to far-infrared carrier wavelength is studied from particle-in-cell simulations. For a long pump wavelength (10.6  μm) promoting a large ratio of electron density over critical, photoionization is shown to catastrophically enhance the plasma wakefield, causing a net downshift in the optical spectrum and ex…
  • Strain-controlled power devices as inspired by human reflex. [Journal Article]
    Nat Commun 2020; 11(1):326Zhang S, Ma B, … Wang ZL
  • Bioinspired electronics are rapidly promoting advances in artificial intelligence. Emerging AI applications, e.g., autopilot and robotics, increasingly spur the development of power devices with new forms. Here, we present a strain-controlled power device that can directly modulate the output power responses to external strain at a rapid speed, as inspired by human reflex. By using the cantilever…
  • Decay of the coronal magnetic field can release sufficient energy to power a solar flare. [Journal Article]
    Science 2020; 367(6475):278-280Fleishman GD, Gary DE, … Nita GM
  • Solar flares are powered by a rapid release of energy in the solar corona, thought to be produced by the decay of the coronal magnetic field strength. Direct quantitative measurements of the evolving magnetic field strength are required to test this. We report microwave observations of a solar flare, showing spatial and temporal changes in the coronal magnetic field. The field decays at a rate of…
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