13results about "Analysis using double resonance" patented technology

In a general embodiment, a magnetic resonance system performs magnetic resonance measurements. In some examples, the magnetic resonance system includes a data processing unit and a superheterodyne spectrometer system. The data processing unit generates digital intermediate frequency (IF) signal information based on the pulse profile. The digital IF signal information is configured to suppress image sidebands in the magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

A system and method for increasing the nuclear spin polarization of a target compound are disclosed. [Solution] According to this system and method, a first non-thermal equilibrium nuclear spin polarization may be conferred to a source atom of at least one source compound, the source atom having a nuclear gyromagnetic ratio of at least 12 megahertz (MHz / T) per tesla. A first solution containing the source compound and the target compound can be obtained. At least one source atom can be present in the first solution at a source concentration of at least 0.1 moles (M). At least 0.01% of a second non-thermal equilibrium nuclear spin polarization can be conferred to at least one target atom of the target compound via nuclear Overhauser effect (NOE) transfer of the first non-thermal equilibrium nuclear spin polarization to at least one target atom.

The present invention relates to a catalyst for cumene hydroperoxide decomposition, wherein said catalyst has good efficacy, provides good decomposition of cumene hydroperoxide and good selectivity to main products, provides high yield percentage of alpha methyl styrene, and reduces the formation of unwanted byproducts. Said catalyst comprises zeolite beta, wherein said catalyst has the following characteristics: a) the mole ratio of silica to alumina is from 30 to 100; and b) the peak area ratio obtained from the analysis using 27Al magic angle spinning-nuclear magnetic resonance (27Al MAS-NMR) technique according to the following relation: (A+C+D) / B is from 0.1 to 0.3; wherein A, B, C, and D are the peak area at the peak position from 44 but less than 54 ppm, the peak area at the peak position from 54 to 58 ppm, the peak area at the peak position greater than 58 to 64 ppm, and the peak area at the peak position from -10 to 5 ppm, respectively, by the peak deconvolution analysis with Lorentz / Gauss function under the condition that the minimum distance between peaks for independent integration (AZFW) is equal to 0.5 ppm. Moreover, this invention relates to a preparation process of the catalyst comprising the step of contacting zeolite beta with polycarboxylic acid solution and calcination at the temperature in the range from 400 to 700 °C, wherein said polycarboxylic acid has the pKa of the first dissociation from 1.5 to 3.5 and has the molecular structure with at least one side having size larger than 6 Å. This invention also relates to a process for cumene hydroperoxide decomposition using said catalyst or catalyst prepared from said preparation process of the catalyst.

Systems and method for nuclear magnetic resonance (NMR) well logging use an inversion pulse sequence with a Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence to improve spin magnetization calculations. Improved Bloch equation-based calculations consider conditions where a longitudinal relaxation time and a transverse relaxation time of the hydrogen nuclei (e.g., of a subterranean hydrocarbon pool and / or water) are within an order of magnitude of pulse durations for the inversion pulse sequence and the CPMG pulse sequence. Accordingly, an NMR response to the inversion pulse sequence and the CPMG pulse can be detected and used to calculate one or more spin magnetization values with higher accuracy amplitudes. Reservoir characteristics are determined based on the one or more spin magnetization values. As such, improved well operations (e.g., selecting a drilling site, determining a drilling depth, and the like) can be performed.

One of our goals is to provide labeled tyrosine molecules that can be excited to a hyperpolarized state, and methods that utilize these molecules. [Solution] A method comprising: a first step of exciting a labeled tyrosine molecule represented by formula (1) in a basic solution by dynamic nuclear polarization to obtain hyperpolarized labeled tyrosine; and a second step of performing NMR observation on a sample containing the hyperpolarized labeled tyrosine. In formula (1), R1 is independently a hydrogen atom or a deuterium atom, R2 is independently a hydrogen atom or a deuterium atom, and R3 is independently a hydrogen atom or a deuterium atom. [C1] TIFF2026075341000007.tif42170

A system and method for increasing the nuclear spin polarization of a target compound are disclosed. According to such a system and method, a first non-thermal equilibrium nuclear spin polarization may be imparted to source atoms of at least one source compound, the source atoms having a nuclear gyromagnetic ratio of at least 12 megahertz per Tesla (MHz / T). A first solution including a source compound and a target compound can be obtained. The at least one source atom can be present in the first solution at a source concentration of at least 0.1 molar (M). A second non-thermal equilibrium nuclear spin polarization of at least 0.01% can be imparted to at least one target atom of the target compound via a Nuclear Overhauser Effect (NOE) transfer of the first non-thermal equilibrium nuclear spin polarization to at least one target atom.

Systems and methods for containing parahydrogen are disclosed. In some of the systems and methods, a gas cylinder is configured to contain hydrogen gas therein. The hydrogen gas may include parahydrogen gas at a first concentration of at least 45% and a pressure of up to 40 bar. The parahydrogen gas may have a decay time constant of at least 30 days. The parahydrogen gas may be for use in a PHIP, PHIP-SAH, SABRE, or PHIPNOESYS NMR or MRI experiment. In some of the systems and methods, a cryogenic chamber is configured to contain liquid hydrogen therein. The liquid hydrogen may include liquid parahydrogen at a concentration of at least 50 mole percent. The liquid hydrogen may be boiled to produce hydrogen gas containing at least 50 mole percent parahydrogen gas. The parahydrogen gas may be for use in a PHIP, PHIP-SAH, SABRE, or PHIPNOESYS NMR or MRI experiment.

Provided is a production method for obtaining a polarized cocrystal of a first compound and a second compound, said method comprising (1) polarizing the first compound, and (2) mixing the polarized first compound and the unpolarized second compound to obtain the polarized cocrystal.

The invention relates to a method for rapidly identifying types of edible oil based on combination of low-field nuclear magnetism and high-field nuclear magnetism. The invention relates to a method for rapidly identifying types of edible oil based on combination of low-field nuclear magnetism and high-field nuclear magnetism. According to the method, the edible oil is identified by adopting a low-field nuclear magnetic resonance detection technology and a high-field nuclear magnetic resonance detection technology. According to the method for rapidly identifying the types of the edible oil based on the combination of the low-field nuclear magnetism and the high-field nuclear magnetism, the problems that in the prior art, the sample treatment requirement is too high, and only grease characteristics can be observed in a single mode are solved through the combination of the low-field nuclear magnetism and the high-field nuclear magnetism; and associating the data model with the chemical parameters to realize rapid and lossless identification of the types of the edible oil.

The embodiment of the invention provides a multi-nuclide nuclear magnetic resonance instrument. The multi-nuclide nuclear magnetic resonance instrument comprises a radio frequency transceiver module, a switch control module, a duplexer module, an impedance matching network and a sample sending tube. The radio frequency transceiver module is connected with the switch control module, a first output end of the switch control module is connected with the duplexer module, and a second output end of the switch control module is connected with the impedance matching network. The impedance matching network comprises a resistance-capacitance circuit and a radio frequency coil, and the radio frequency coil is arranged on the outer side of the sample feeding pipe. And the switch control module switches the circuit structure of the impedance matching network based on the radio frequency pulse transmitted by the radio frequency transceiver module, so that the radio frequency coil outputs a radio frequency wave with a target frequency to excite nuclide of a sample in the sample sending tube. According to the multi-nuclide nuclear magnetic resonance instrument, the circuit structure of the impedance matching network is switched, so that the radio frequency coil can stably resonate under different frequencies, stable resonance and impedance matching are realized under a relatively large frequency span, and the signal acquisition efficiency and the signal-to-noise ratio are improved.

The present invention discloses a method for optimizing the sampling trajectory of a molecular exchange magnetic resonance (MEL) measurement. The method includes the steps of: (1) determining the number and corresponding range of physiological / physical parameters of a molecular exchange system and generating a simulated physiological / physical parameter dataset; (2) determining a molecular exchange magnetic resonance measurement method and setting the acquisition parameters; (3) constructing an end-to-end integrated network model including a sampling trajectory optimization network, a noise signal generation network, and a parameter estimation network; and (4) training the network using the simulated physiological / physical parameters as input, and obtaining the optimized sampling trajectory and the corresponding parameter estimation network once the network has converged and training is complete. The present invention further discloses a molecular exchange magnetic resonance measurement method and apparatus. The method for optimizing the sampling trajectory of a molecular exchange magnetic resonance measurement provided by the present invention improves the efficiency and accuracy of physiological / physical parameter estimation and can be applied to various molecular exchange magnetic resonance measurement methods.