Hyperspectral
Imaging
These pictures
illustrate how it is possible
to detect a plastic plant
among real plants using HySpex data. Top: Image shown with "normal"
colours (RGB). Middle: Using the IR information which is displayed in
red (red channel chosen above chlorophyll red edge at ~700nm). Bottom:
Classification image where the real plants are green, the fake plant
is red and the pottery is blue. As can be seen, a plastic plant can
easily be detected among real plants using a HySpex camera even though
the plastic plants visually look identical to the human eye.
http://www.neo.no/products/hyperspectral.html
Mudslides, Slurry Flows
and Particle Tracking
Slurry flows are
models of mudslides; UCLA has on ongoing numerical,
experimental and theoretical study of slurry flows.
Glass beads of a uniform size are mixed into a less dense viscous
fluid. The
resulting slurry is poured into a reservoir at the top of an inclined
plane. A controlled amount of the slurry is allowed to flow through a
gate
down the incline. At low inclination angles and concentrations,
the particles tend to settle out of the mixture and stick to the
surface
of the incline, leaving a clear fluid to flow down the slope.
At intermediate angles and concentrations, a well-mixed slurry flows
down the slope, producing the characteristic fingering
pattern seen in visous films. At high inclination angles and particle
concentrations, the beads tend to collect at the front
of the film; their presence drastically changes the dynamics of
the contact line, supressing fingering and producing a pronounced
ridge.
Notice the high degree of fingering in the fluid flow.
The
position of the front of the fluid can be approximated as
the average of the actual fluid front.
