Principle Plastics

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Battelle Memorial Institute

Virco Mfg. Corporation

David W Hoyt

Gary T Aldcroft

Jesse A Sears, Jr

Jian Zhi Hu

Hardeep S Mehta

Romulus V F Turcu

Kevin M Rosso

Stuart Pullen

Patrick Anthony Begley

Arecio A Hernandez

Robert A Wind

Dolph G Hoyt, Jr

Charles H F Peden

Jeffrey M Strang

Eric D Walter

David Aldcroft

Snap-in bushings are disclosed that enable sealing of sample chambers in MAS-NMR rotors for high pressure and/or high temperature operation that enhance pressure limits up to about 400 bar and temperature limits up to at least about 250&#xb0; C.

Snap-in bushings and process for high-pressure and/or high temperature magic angle spinning nuclear magnetic resonance spectroscopy

A high-pressure magic angle spinning (MAS) rotor is detailed that includes a high-pressure sample cell that maintains high pressures exceeding 150 bar. The sample cell design minimizes pressure losses due to penetration over an extended period of time.

Devices and process for high-pressure magic angle spinning nuclear magnetic resonance

A continuous-flow (CF) magic angle sample spinning (CF-MAS) NMR rotor and probe are described for investigating reaction dynamics, stable intermediates/transition states, and mechanisms of catalytic reactions in situ. The rotor includes a sample chamber of a flow-through design with a large sample volume that delivers a flow of reactants through a catalyst bed contained within the sample cell allowing in-situ investigations of reactants and products. Flow through the sample chamber improves diffusion of reactants and products through the catalyst. The large volume of the sample chamber enhances sensitivity permitting in situC CF-MAS studies at natural abundance.

Magic angle spinning nuclear magnetic resonance apparatus and process for high-resolution in situ investigations

Described are a 'Discrete Magic Angle Turning' (DMAT) system, devices, and processes that combine advantages of both magic angle turning (MAT) and magic angle hopping (MAH) suitable, e.g., for in situ magnetic resonance spectroscopy and/or imaging. In an exemplary system, device, and process, samples are rotated in a clockwise direction followed by an anticlockwise direction of exactly the same amount. Rotation proceeds through an angle that is typically greater than about 240 degrees but less than or equal to about 360 degrees at constant speed for a time applicable to the evolution dimension. Back and forth rotation can be synchronized and repeated with a special radio frequency (RF) pulse sequence to produce an isotropic-anisotropic shift 2D correlation spectrum. The design permits tubes to be inserted into the sample container without introducing plumbing interferences, further allowing control over such conditions as temperature, pressure, flow conditions, and feed compositions, thus permitting true in-situ investigations to be carried out.

Discrete magic angle turning system, apparatus, and process for in situ magnetic resonance spectroscopy and imaging

Garden shoe with strap

Garden shoe

Shoe

Vented shoe

Jacket

Vest

Pulse width modulated (&ldquo;Class D&rdquo;) amplifiers and controllers switching in the 50 khz to 2 MHz range generate harmonics that interfere with AM radio reception. This interference has precluded wide spread acceptance of class D amplifiers in products that include an AM radio. The amplifier described here uses a a harmonic avoidance modulator when operating with an AM radio to avoid generating harmonics at the receiver selected frequency or the intermediate (IF) frequency thereof.

Dual mode class D amplifiers

Growing community of inventors

Richland, WA, United States of America

David W Hoyt