192,399 research outputs found
Demonstration of dispersive rarefaction shocks in hollow elliptical cylinder chains
We report an experimental and numerical demonstration of dispersive
rarefaction shocks (DRS) in a 3D-printed soft chain of hollow elliptical
cylinders. We find that, in contrast to conventional nonlinear waves, these DRS
have their lower amplitude components travel faster, while the higher amplitude
ones propagate slower. This results in the backward-tilted shape of the front
of the wave (the rarefaction segment) and the breakage of wave tails into a
modulated waveform (the dispersive shock segment). Examining the DRS under
various impact conditions, we find the counter-intuitive feature that the
higher striker velocity causes the slower propagation of the DRS. These unique
features can be useful for mitigating impact controllably and efficiently
without relying on material damping or plasticity effects
In situ transmission electron microscopy studies of shear bands in a bulk metallic glass based composite
In situ straining transmission electron microscopy (TEM) experiments were performed to study the propagation of the shear bands in the Zr56.3Ti13.8Cu6.9Ni5.6Nb5.0Be12.5 bulk metallic glass based composite. Contrast in TEM images produced by shear bands in metallic glass and quantitative parameters of the shear bands were analyzed. It was determined that, at a large amount of shear in the glass, the localization of deformation occurs in the crystalline phase, where formation of dislocations within the narrow bands are observed
Idiopathic CD4+ T-lymphocytopenia with cryptococcal meningitis: first case report from Cambodia.
We report on a patient with cryptococcal meningitis with CD4+ T-lymphocytopenia and no evidence of HIV infection
Fluid Coexistence close to Criticality: Scaling Algorithms for Precise Simulation
A novel algorithm is presented that yields precise estimates of coexisting
liquid and gas densities, , from grand canonical Monte Carlo
simulations of model fluids near criticality. The algorithm utilizes data for
the isothermal minima of the moment ratio in boxes, where
. When the minima, , tend to zero while their locations, , approach and . Finite-size scaling
relates the ratio {\boldmath } {\em universally} to
, where
is the desired width of the
coexistence curve. Utilizing the exact limiting form, the
corresponding scaling function can be generated in recursive steps by fitting
overlapping data for three or more box sizes, , , , .
Starting at a sufficiently far below and suitably
choosing intervals 0 yields
and precisely locates
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