Cryogenic integrated circuits architecture for multiplexed chemical-shift NMR

    公开(公告)号:US12019130B2

    公开(公告)日:2024-06-25

    申请号:US17465895

    申请日:2021-09-03

    摘要: Chemical-shift nuclear magnetic resonance (NMR) spectroscopy involves measuring the effects of chemical bonds in a sample on the resonance frequencies of nuclear spins in the sample. Applying a magnetic field to the sample causes the sample nuclei to emit alternating current magnetic fields that can be detected with color centers, which can act as very sensitive magnetometers. Cryogenically cooling the sample increases the sample's polarization, which in turn enhances the NMR signal strength, making it possible to detect net nuclear spins for very small samples. Flash-heating the sample or subjecting it to a magic-angle-spinning magnetic field (instead of a static magnetic field) eliminates built-in magnetic field inhomogeneities, improving measurement sensitivity without degrading the sample polarization. Tens to hundreds of small, cryogenically cooled sample chambers can be integrated in a semiconductor substrate interlaced with waveguides that contain color centers for optically detected magnetic resonance measurements of the samples' chemical-shift NMR frequencies.

    FUNCTIONALIZED ELASTOMER
    8.
    发明申请

    公开(公告)号:US20190055332A1

    公开(公告)日:2019-02-21

    申请号:US15677507

    申请日:2017-08-15

    IPC分类号: C08F36/14 C08F36/06 C08F36/08

    摘要: The present invention is directed to a stereoregular functionalized elastomer represented by poly(M1 co M2), wherein the functionalized elastomer comprises a microstructure selected from the group consisting of microstructures having at least 90 percent by weight of monomer residues in trans 1,4-configuration, and microstructures having at least 80 percent by weight of monomer residues in cis 1,4-configuration; wherein M1 is selected from the group consisting of isoprene and 1,3-butadiene; and M2 is of formula 4 wherein R6 is a covalent bond, phenylene, a linear or branched alkane diyl group containing 1 to 10 carbon atoms, or a combination of one or more phenylene groups and one or more linear or branched alkane diyl groups containing 1 to 10 carbon atoms; R7 is hydrogen or a linear or branched alkyl group containing 1 to 10 carbon atoms; X1 is selected from formulas 5 and 6 wherein R8 and R9 are independently trialkylsilyl, phenyl or a linear or branched alkyl group containing 1 to 10 carbon atoms, or one of R8 and R9 is hydrogen and the other is phenyl or a linear or branched alkyl group containing 1 to 10 carbon atoms, or R8 and R9 taken together with the nitrogen atom represent a nitrogen containing heterocyclic group containing from 4 to 12 carbon atoms; and X2 is a sulfur atom or a structure of formula 7 or 8 wherein when X2 is of formula 8, the S atom of formula 8 is adjacent to the phenyl ring of formula 6 and the N atom of formula 8 is adjacent to R6.

    ESTIMATING FORMATION PROPERTIES USING SATURATION PROFILES

    公开(公告)号:US20190033238A1

    公开(公告)日:2019-01-31

    申请号:US15661852

    申请日:2017-07-27

    IPC分类号: G01N24/08 G01N1/34 G01R33/46

    摘要: Methods estimating a property of a porous media include: saturating a sample of the porous media; spinning the sample in a centrifuge with a first end of the sample closer to an axis of rotation of the centrifuge than a second end of the sample; obtaining a first estimate of the first property; saturating the sample of the porous media; spinning the sample in a centrifuge with the second end of the sample closer to the axis of rotation of the centrifuge than the first end of the sample; obtaining a second estimate of the first property; and determining the second property of the porous media based at least in part on the first estimate of the first property and the second estimate of the first property. The first property can be a T2 distribution and the second property can be a T2 cutoff

    APPARATUS AND METHOD FOR IN-VIVO FAT AND IRON CONTENT MEASUREMENT

    公开(公告)号:US20180220949A1

    公开(公告)日:2018-08-09

    申请号:US15868996

    申请日:2018-01-11

    申请人: Pablo Jose Prado

    发明人: Pablo Jose Prado

    IPC分类号: A61B5/00 G01R33/46 A61B5/055

    摘要: An apparatus for measuring liver fat content and/or iron content non-invasively in vivo using unilateral NMR technology is disclosed. The apparatus comprises a unilateral NMR probe positioned against or in the proximity of the body. The probe generates static and RF magnetic fields to measure NMR signals at selected depths into the body. The apparatus further comprises a unilateral magnet and a unilateral antenna placed between a magnet and the body or around the magnet. The unilateral antenna is used to attain NMR signals. The measurement of NMR signals at a single position with a single frequency determines fat content on a specific volume inside the liver. The measurement of NMR signals at a single position with two or more frequencies determines iron content on a specific volume inside the liver.