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216results about How to "Effective decoupling" patented technology

Sample component trapping, release, and separation with membrane assemblies interfaced to electrospray mass spectrometry

ActiveUS20080047330A1Optimization of massMass performanceSamplingParticle separator tubesAmount of substanceESI mass spectrometry
The invention provides a method and apparatus for trapping, releasing and/or separating sample components in solution passing through a channel with or without packing material present by passing ion current through the channel driven by an electric field. A portion of the ion current comprises cation and/or anion species generated from second solution flows separated from the sample solution flow path by semipermeable membranes. Cation and/or Anion ion species generated in the second solution flow regions are transferred into the sample solution flow path through ion selective semipermeable membranes. Ion current moving along the sample solution flow path is controlled by varying the composition of the second solutions and/or changing the voltage between membrane sections for a given sample solution composition. The sample composition may also be varied separately or in parallel to enhance trapping, release and/or separation efficiency and range. The invention when interfaced to an Atmospheric Pressure Ion Source, that may include Electrospray Ionization, with mass spectrometric analysis enables independent control of the on-line sample separation process and the Atmospheric Pressure Ion Source or Electrospray ionization processes.
Owner:PERKINELMER HEALTH SCIENCES INC

Load simulator based on series-parallel mechanism

The invention discloses a load simulator based on a series-parallel mechanism, which consists of an in-series assembly (1), an in-parallel branched-chain assembly A (2), an in-parallel branched-chain assembly B (3), an in-parallel branched-chain assembly C (4) and a static platform assembly (5). Connecting rods at the upper ends of the in-parallel branched-chain assembly A (2), the in-parallel branched-chain assembly B (3), the in-parallel branched-chain assembly C (4) are installed on the static platform assembly (5); elastic plates at the lower ends of the in-parallel branched-chain assembly A (2), the in-parallel branched-chain assembly B (3), the in-parallel branched-chain assembly C (4) are installed on the sleeve of the in-series assembly (1); the motor base of the in-series assembly (1) is installed on the static platform assembly (5); and the sleeve of the in-series assembly (1) is respectively connected with the elastic plates of the in-parallel branched-chain assembly A (2), the in-parallel branched-chain assembly B (3), the in-parallel branched-chain assembly C (4). The load simulator is used for performance test for instruments and equipment; in addition, the load simulator has the ability of combined loading of loads in various directions, and the simulator is realized by the series-parallel connection of in-series mechanisms and in-parallel mechanisms.
Owner:BEIHANG UNIV

Switching amplifier for driving reactive loads

A switching amplifier drives balanced piezoelectric or other capacitive or reactive loads with a minimum physical electronics volume, enabling a compact arrangement that can combine amplifier and transducer at the same physical location. Power supply current is minimized by using two or more transducers driven with phase-shifted signals, resulting in stored energy being cycled between the transducers rather than being carried over the power supply lines for storage in a power supply. Auxiliary power supply capacitors to store energy coming out of the load can thus be minimized. The modulation scheme puts the switching frequencies in common-mode while the baseband signals are differential mode. The common-mode switching frequency signals are blocked from the loads by a common-mode inductor. The common-mode inductor can be physically small as a result of the large baseband load currents being in differential mode. Low-volume load filters are made possible by the fact that they are not called upon to filter signals at the fundamental switching frequency but only at higher frequencies. The loads are biased independently of the baseband signals. The switching amplifier can drive balanced loads comprising two, three or more individual load elements.
Owner:SUMMIT APPLIED RES INC
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