Matthew M Myers

US Patent:

7429761, Sep 30, 2008

Filed:

Dec 17, 2004

Appl. No.:

11/014458

Inventors:

Moshe Friedman - Washington DC, US
Matthew Myers - Beltsville MD, US
Frank Hegeler - Vienna VA, US
John Sethian - Burke VA, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H01L 29/74

US Classification:

257152, 257199, 257481, 438 91

Abstract:

A high power diode includes a cathode for emitting a primary electron discharge, an anode, and a porous dielectric layer, e. g. a honeycomb ceramic, positioned between the cathode and the anode for receiving the primary electron discharge and emitting a secondary electron discharge. The diode can operate at voltages 50 kV and higher while generating an electron beam with a uniform current density in the range from 1 A/cmto >10 kA/cmthroughout the area of the cathode. It is capable of repetitively pulsed operation at a few Hz with pulse duration from a few nanoseconds to more than a microseconds, while the total number of pulses can be >10pulses. The diode generates minimal out-gassing or debris, i. e. with minimal ablation, providing a greater diode lifetime, and can operate in a high vacuum environment of 10Torr. The high power diode is useful in many applications requiring a high current electron beam.

US Patent:

7600410, Oct 13, 2009

Filed:

Dec 21, 2006

Appl. No.:

11/642989

Inventors:

Prasanna Hariharan - Rockville MD, US
Ronald A. Robinson - Germantown MD, US
Matthew R. Myers - Potomac MD, US
Subha Maruvada - North Bethesda MD, US
Rupak K. Banerjee - Mason OH, US
Gerald R. Harris - Rockville MD, US

Assignee:

St. Jude Medical, Atrial Fibrillation Division, Inc. - St. Paul MN
The United States of America as represented by the Secretary Department of Health and Human Services - Washington DC
The University of Cincinnati - Cincinnati OH

International Classification:

G01V 13/00

US Classification:

73 183

Abstract:

A system for optically characterizing an acoustic beam generally includes an immersant, which is an immersion medium seeded with a plurality of seed particles that respond to illumination with fluorescence indicative of at least one parameter of the immersant such as flow or temperature. Optical transmitters illuminate the immersant slicewise, and optical receptors receive the fluorescence in order to generate a three-dimensional map of the parameter over time. A processor back-calculates one or more characteristics of an acoustic beam that results in the map. The processor initially generates a behavior model of an acoustic beam propagating in the immersant by utilizing initial guesses for the characteristics. The initial guess model is compared to the map, and an optimization routine is used to refine the initial guesses. The process repeats iteratively with refined guesses until the difference between the model and the map is minimized.

US Patent:

20130153404, Jun 20, 2013

Filed:

Oct 5, 2012

Appl. No.:

13/645556

Inventors:

John D. Sethian - Burke VA, US
Matthew Myers - Beltsville MD, US
Mathew Wolford - Woodbridge VA, US
Frank Hegeler - Vienna VA, US

International Classification:

B01J 19/08
B01D 53/74

US Classification:

2041573, 422168

Abstract:

A process and apparatus for removing NOfrom exhaust gases produced by combustion-based energy sources. An array of high voltage pulsed electron beams are repetitively generated and transported through a thin foil into the exhaust gas containing NO. The electron beam deposits its energy into the gas and produces reactive radicals N, N, e, Nfrom the NOin the gas. These radicals recombine through chemical reactions to produce benign by-products nitrogen Nand oxygen Owhich are output into the atmosphere.

US Patent:

20170087509, Mar 30, 2017

Filed:

Sep 6, 2016

Appl. No.:

15/256768

Inventors:

- Arlington VA, US
Matthew C. Myers - Beltsville MD, US
John D. Sethian - Burke VA, US
Frank Hegeler - Vienna VA, US

Assignee:

The Government of the United States of America, as represented by the Secretary of the Navy - Arlington VA

International Classification:

B01D 53/32
B01D 53/56
B01D 53/92

Abstract:

An improved process and for removing NOfrom exhaust gases produced by combustion-based energy sources. Catalyst-free exhaust gas is directed into one or more ducts. The gas is cooled and then passes through the duct, wherein the gas flow rate and the electron beam pulse rate are configured to cause each successive volume of gas that flows past the window to be subjected to only a single electron beam pulse in the reaction chamber. A single short, intense electron beam is fired into the exhaust through a window in the reaction chamber as the exhaust flows past the window, with some of the electrons being reflected back into the gas by a reflective plate situated opposite the window. The deposited electron energy causes NOfrom the exhaust to be converted into Nand Owhich are output into the atmosphere with the thus-scrubbed exhaust.

US Patent:

20160108504, Apr 21, 2016

Filed:

Feb 5, 2015

Appl. No.:

14/614686

Inventors:

- Washington DC, US
Matthew C. Myers - Beltsville MD, US
Mathew Wolford - Woodbridge VA, US
Frank Hegeler - Vienna VA, US
Ronald L. Holtz - Lorton VA, US
Derek Horton - Alexandria VA, US
Alexis C. Lewis - Alexandria VA, US
Kathryn J. Wahl - Alexandria VA, US

International Classification:

C22F 1/047
C21D 1/34
C22C 21/08

Abstract:

A method for desensitizing an aluminum alloy is presented. A desired location on the surface of an aluminum alloy sample is exposed to a controlled pulsed electron beam. The pulsed electron beam heats a shallow layer of the metal alloy having a desired depth at the desired location on the surface of the sample to a temperature between a solvus temperature and an annealing temperature of the metal alloy to controllably reduce a degree of sensitization of the metal alloy sample at the desired location, an extent of a reduction in the degree of sensitization being controllable by varying at least one of a voltage, a current density, a pulse duration, a pulse frequency and a number of pulses of the electron beam.