Mark A. Rhodes, Scott N. Fochs
Apparatus and Method for Electrical Insulation in Plasma Discharge
Systems
U.S. Patent 6,605,901 B1
August 12, 2003
An apparatus and method to contain plasma at optimal fill capacity
of a metallic container. The invention uses anodized layers to
form the internal surfaces of the container volume. Bias resistors
are calibrated to provide constant current at variable voltage.
The voltages of the metallic container can be adjusted relative
to the voltage of an anode by choosing the appropriate values of
the bias resistors. In this way, the optimal plasma fill can be
achieved while minimizing the chance that the breakdown voltage
of the anodized layer is reached.
Babak Sadigh, Thomas J. Lenosky, Tomas Diaz de la Rubia
Method for Enhancing the Solubility
of Dopants in Silicon
U.S. Patent 6,627,522 B2
September 30, 2003
A method for enhancing the equilibrium solid solubility of dopants
in silicon, germanium, and silicon–germanium alloys. The
method involves subjecting silicon-based substrate to biaxial or
compression strain. It has been determined that boron solubility
was largely enhanced (more than 100 percent) by a compressive biaxial
strain, based on a size-mismatch theory, since the boron atoms
are smaller than the silicon atoms. The large enhancement or mixing
properties of dopants in silicon and germanium substrates is primarily
governed by their charge and, to second order, by their size mismatch
with the substrate. Furthermore, the dopant solubility enhancement
with strain is most effective when the impurity’s charge
and the size mismatch favor the same type of strain. Thus, the
solid solubility of small p-type dopants (such as boron) and large
n-type dopants (such as arsenic) can be raised most dramatically
by appropriate biaxial (compressive) strain. The solubility of
a large p-type dopant (such as indium) in silicon will be raised
because of its size mismatch with silicon, which favors tensile
strain, while its negative charge prefers compressive strain. Thus,
the two effects counteract each other.
Chris Darrow, Tino Seger
Interrogation Cradle and
Insertable Containment Fixture for Detecting Birefringent Microcrystals
in Bile
U.S. Patent 6,628,387 B2
September 30, 2003
A transparent flow channel fluidly communicates a fluid source
and a collection reservoir. An interrogating light beam passes
through a first polarizer having a first plane of polarization.
The flow channel is orthogonal to the light beam. The light beam
passes through a fluid sample as it flows through the flow channel.
The beam is then filtered through a second polarizer that has
a second plane of polarization rotated 90 degrees from the first
plane of polarization. An electronic photodetector aligned with
the light beam signals the presence of birefringent microcrystals
in the fluid sample by generating voltage pulses.
A disposable
containment fixture includes the flow channel and the collection
reservoir. The fixture is adapted for removable
insertion into an interrogation cradle that includes optical
and data-processing components. The cradle rigidly positions
the centerline
of the flow channel orthogonal to the light beam.
Richard Freeman Post
Inductrack
Configuration
U.S. Patent 6,629,503 B2
October 7, 2003
A simple permanent-magnet-excited maglev geometry provides
levitation forces; it is stable against vertical displacements
from equilibrium
but is unstable against horizontal displacements. An Inductrack
system is then used with this system to effect stabilization
against horizontal displacements. The Inductrack system
also provides centering
forces to overcome centrifugal forces when the vehicle
is traversing curved sections of a track or when another transient
horizontal
force is present. In some proposed embodiments, the Inductrack
track elements are also used as the stator of a linear
induction-motor
drive and braking system.
Richard Freeman Post
Inductrack Magnet Configuration
U.S. Patent 6,633,217 B2
October 14, 2003
A magnet configuration comprising a pair of Halbach arrays
magnetically and structurally connected together. The
Halbach arrays are positioned
with respect to each other so that a first component
of their fields substantially cancels at a first plane between
them
and a second
component of their fields substantially adds at this
first
plane. A track of windings is located between the pair
of Halbach arrays,
and a propulsion mechanism is provided for moving them
along the track. When the arrays move along the track
and the track
is not
located at the first plane, a current is induced in the
windings, which then exerts a restoring force on the
pair. |