Wisconsin Alumni Research Foundation

About: Wisconsin Alumni Research Foundation is a nonprofit organization based out in Madison, Wisconsin, United States. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 4209 authors who have published 3523 publications receiving 61017 citations.

Short echo NMR imaging of sodium

Abstract: An NMR pulse sequence includes a nonselective RF excitation pulse followed by one or more nonselective echo RF pulses which produce NMR echo signals at echo times starting at TE=2.5 milliseconds. This short echo time enables paramagnetic nuclei having short T 2 relaxation components, such as sodium 23 , to be measured and imaged. Presaturation pulses at the beginning of the NMR pulse sequence serve as an alternative to slice selection.

Position control system for use with micromechanical actuators

Abstract: A positioning system adapted for use with micromechanical actuators provides feedback control of the position of the movable element of the actuator utilizing a low Q sensing coil. The effective inductance of the sensing coil changes with position of the movable element to change the frequency of oscillation of a variable oscillator. The output of the variable oscillator is compared in a phase detector to a reference oscillator signal. The phase detector provides a pulsed output having a pulse duty cycle related to the phase or frequency difference between the oscillator signals. The output of the phase detector is provided to a drive coil which applies a magnetic force to the movable element which balances the force of a spring. The movable element can be displaced to a new position by changing the frequency of the reference oscillator.

Vitamin d analog-rak, methods and uses thereof

Abstract: Compounds of formula (IA) or (IB) are provided where X1, X2 and X3 are independently selected from H or hydroxy protecting groups and R1 is selected from straight or branched chain alkyl groups having from 1 to 8 carbon atoms; straight or branched chain alkenyl groups having from 2 to 8 carbon atoms; straight or branched chain hydroxy-substituted alkyl groups having from 1 to 8 carbon atoms; straight and branched chain hydroxy-substituted alkenyl groups having from 2 to 8 carbon atoms. Such compounds are used in preparing pharmaceutical compositions and are useful in treating a variety of biological conditions.

Method and apparatus providing improved ultrasonic strain measurements of soft tissue

Abstract: The variation in acoustic properties in soft tissues, such as biological tissues, as a function of strain may be modeled to improve elastographic measurements and to obtain direct measurements of strain or material properties and pre-stress.