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Carbon Producing Wildfires



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Techs of the Week

A process has been developed to manufacture a self-aligned transistor where a thermally intolerant material may be used as a material of a gate insulating film and the gate electrode. The process makes it possible to produce high-performance, highly reliable, and inexpensive transistor devices. It leads to the improvement of electrical characteristics such as speed. Moreover, the process uses conventional semiconductor fabrication processes, making it possible to reduce manufacturing costs. Click here for more info.

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Hot Stuff



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Helping the Blind "See"



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Technology Business Needs

Low NOX Burner Technology and Advanced Combustion Technology A company is interested in technology partnership or license agreement of deNOX technologies such as SCR or SNCR and advanced burner technologies. Nanotechnologies Wanted S.O.F.C. (solid oxide fuel cell) technology; low-temperature SOFC solid oxide materials and Stack Zero technology for nano particle coating; LSM multiple pore coating technology; NI HYS multiple pore coating technology; stack multi-layer thin coating; and DMFC technology (Direct Methanol Fuel Cell).

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Flux-Based Deadbeat Control of Induction-Motor Torque

Graphical constructions provide insight into solutions of control problems. An improved method and prior methods of deadbeat direct torque control involve the use of pulse-width modulation (PWM) of applied voltages. The prior methods are based on the use of stator flux and stator current as state variables, leading to mathematical solutions of control equations in forms that do not lend themselves to clear visualization of solution spaces. In contrast, the use of rotor and stator fluxes as the state variables in the present improved method lends itself to graphical representations that aid in understanding possible solutions under various operating conditions. In addition, the present improved method incorporates the superposition of high-frequency carrier signals for use in a motor-self-sensing technique for estimating the rotor shaft angle at any speed (including low or even zero speed) without need for additional shaft-angle-measuring sensors.

Posted in: Mechanical Components, Briefs, TSP

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Touchdown Ball-Bearing System for Magnetic Bearings

In the event of a touchdown, ball bearings provide full support. The torque-limited touchdown bearing system (TLTBS) is a backup mechanical- bearing system for a high-speed rotary machine in which the rotor shaft is supported by magnetic bearings in steady-state normal operation. The TLTBS provides ballbearing support to augment or supplant the magnetic bearings during startup, shutdown, or failure of the magnetic bearings. The TLTBS also provides support in the presence of conditions (in particular, rotational acceleration) that make it difficult or impossible to control the magnetic bearings or in which the magnetic bearings are not strong enough (e.g., when the side load against the rotor exceeds the available lateral magnetic force).

Posted in: Mechanical Components, Briefs, TSP

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