42 results about "J-coupling" patented technology

A quantum bit computing architecture includes a plurality of single spin memory donor atoms embedded in a semiconductor layer, a plurality of quantum dots arranged with the semiconductor layer and aligned with the donor atoms, wherein a first voltage applied across at least one pair of the aligned quantum dot and donor atom controls a donor-quantum dot coupling. A method of performing quantum computing in a scalable architecture quantum computing apparatus includes arranging a pattern of single spin memory donor atoms in a semiconductor layer, forming a plurality of quantum dots arranged with the semiconductor layer and aligned with the donor atoms, applying a first voltage across at least one aligned pair of a quantum dot and donor atom to control a donor-quantum dot coupling, and applying a second voltage between one or more quantum dots to control a Heisenberg exchange J coupling between quantum dots and to cause transport of a single spin polarized electron between quantum dots.

An embodiment of a method of detecting a J-coupling includes providing a polarized analyte adjacent to a vapor cell of an atomic magnetometer; and measuring one or more J-coupling parameters using the atomic magnetometer. According to an embodiment, measuring the one or more J-coupling parameters includes detecting a magnetic field created by the polarized analyte as the magnetic field evolves under a J-coupling interaction.

A method for obtaining nuclear magnetic resonance measurements includes inducing a static magnetic field in a formation fluid sample; applying an oscillating magnetic field to the fluid sample according to a preparation pulse sequence that comprises a J-edit pulse sequence for developing J modulation; and acquiring the nuclear magnetic resonance measurements using a detection sequence, wherein the detection sequence comprises at least one 180-degree pulse. The method may further include acquiring the nuclear magnetic resonance measurements a plurality of times each with a different value in a variable delay in the J-edit pulse sequence; and analyzing amplitudes of the plurality of nuclear magnetic resonance measurements as a function of the variable delay to provide J coupling information.

The invention provides a method for acquiring two-dimensional J-resolved spectroscopy of magnetic resonance by single sweeping. Through a module executing 'sampling and 180-degree pulsing' repeatedly after exciting a magnetization vector to an XY plane, data needed for two-dimensional J- resolved spectroscopy can be acquired by only one-time excitation. In order to acquire better resolution on a direct dimension F2 of a spectrogram, raw data are predicted along the direct dimension F2, and signals are attenuated completely. Compared with a traditional method, the method has the advantage that time of experiment is shortened greatly; compared with a previous spatial encoding method, the method is equivalent to the previous method in experimental time, can provide higher signal to noise ratio and resolution, and is simple in sequence and convenient to operate; compared with a one-dimensional spectroscopy method, the method is equivalent to the method in experimental time, but can provide finer J-coupling split peak information. The simple and efficient method plays an important role in metabolite batch testing, organic chemistry reaction and bioassay.

A nuclear magnetic resonance transverse relaxation measurement method without J-coupling-effect interference is suitable for a routine liquid magnetic resonance spectrometer. The nuclear magnetic resonance transverse relaxation measurement method without J-coupling-effect interference can eliminate the J-coupling-effect interference. The method comprises the steps of (1), measuring a pi/2 nonselective RF pulse width required for exciting a sample; (2), introducing a nuclear magnetic resonance pulse sequence into the magnetic resonance spectrometer; (3), starting a transverse relaxation evolution module and a pure chemical shift decoupling module based on a perfect echo for the nuclear magnetic resonance pulse sequence, and setting experiment parameters of the transverse relaxation evolution module and the pure chemical shift decoupling module; (4), performing three-dimensional data sampling; and (5), after data sampling, performing related data after-processing operation, and obtaining a two-dimensional spectrum of which the direct dimension is the pure chemical shift information and the indirect dimension is the transverse relaxation time and error, namely a pure chemical shift-transverse relaxation time two-dimensional correlation spectrum.

The invention provides a nuclear magnetic resonance multi-dimensional spectrum method for measuring the hydrogen-hydrogen coupling constant of a specific hydrogen nucleus. The nuclear magnetic resonance multi-dimensional spectrum method comprises: applying a selective 90 DEG soft pulse while applying a Z-direction magnetic field gradient; applying a perfect echo module, and applying Z-direction magnetic field gradients with the same strength and the same direction on both sides of the selective 180 DEG soft pulse of the perfect echo; adding the 180 DEG soft pulse of an S nucleus after the first t1/2 evolution time in the second echo of the perfect echo so as to retain the J-coupling information of the S nucleus; adding the 180 DEG soft pulse of the S nucleus after the second t1/2 to compensate phase distortion; respectively applying the 180 DEG soft pulse of the selective S nucleus before the two t1/2 evolution times in the second echo so as to obtain a R type sequence corresponding toa N type sequence; and finally carrying out addition on a N type spectrum and a R type spectrum inverted along indirect dimension to obtain a phase-sensitive two-dimensional spectrum, and obtaining the corresponding J-coupling constant by measuring from the splitting of the peak in the indirect dimension.

The invention provides a spin coupling network phase sensitive spectrum implementation method based on pure chemical shift. The method mainly relates to spin excitation, selective repolymerization, pure chemical shift and phase-sensitive implementation. The method comprises: sending the uniformly stirred sample to be detected into a detection cavity of a nuclear magnetic spectrometer; performing tuning, shimming and field locking; measuring the non-selective pi/2 pulse width; acquiring a hydrogen spectrum by utilizing the standard sequence to obtain spectrum peak information; importing a preset sequence and setting experimental parameters, and executing data sampling; carrying out pure chemical shift data processing to obtain a two-dimensional spectrum containing J coupling information andpure chemical shift; and carrying out two-dimensional phase-sensitive processing on the obtained spectrogram. The method has the beneficial effects that (1) a single spin coupling network two-dimensional spectrum with a pure absorption peak line type can be obtained by only one experiment; (2) the J coupling constant can be accurately measured.

The invention provides a nuclear magnetic resonance method for measuring all hydrogen-hydrogen coupling constants in a molecule. The nuclear magnetic resonance method comprises the following steps: firstly applying one 90-degree hard pulse to rotate a magnetization vector to an XY plane from a Z direction, setting a sampling point at one fixed moment delta after the 90-degree hard pulse; enabling a selective 180-degree soft pulse applied at the same time with Z direction magnetic field gradient to move between the 90-degree hard pulse and the sampling point along with variation of indirect dimension evolution time t1; under the action of the magnetic field gradient, overturning different nucleuses at different spatial positions by the selective 180-degree soft pulse; acquiring chemical displacement information and spatial position information at the same time by adopting an EPSI sampling module, so that couplings of other nucleuses and the nucleus overturned by the 180-degree soft pulse at the same layer can be obtained at different layers, the couplings can show up split peaks at an indirect dimension, and corresponding J coupling constants can be measured from the split peaks.

The invention provides a high-resolution nuclear magnetic resonance spectroscopy for measuring a hydrogen-hydrogen J coupling constant. The method comprises the following steps: after a 90-degree excitation pulse is applied, applying a monochromatic selective 180-degree pulse to a to-be-detected proton, delaying for t1/2 time, applying a dichromatic selective 180-degree pulse to the to-be-detectedproton and another proton coupled with the to-be-detected proton, and delaying for t1/2 time; carrying out sampling after an evolution period; after the experiment is finished, extracting starting delta time length data from each group of data, and sequentially splicing the data into new one-dimensional data; and carrying out Fourier transform, so as to obtain a new one-dimensional spectrum required by a user, wherein only a signal for detecting the proton selected by the user is maintained, and only J coupling cracking between the proton and another selected proton is maintained. Therefore,the J coupling constant between the two protons can be accurately measured.

The invention discloses a pure chemical shift-based nuclear magnetic resonance diffusion spectroscopy method, and relates to nuclear magnetic resonance spectroscopy detection. A response echo diffusion module is used to realize diffusion coefficient evolution; a PSYCHE pure chemical shift decoupling module is used to eliminate J coupling effect induced spectral peak splitting, and one-dimensionalpure chemical shift spectrum information is provided for the measurement of the diffusion coefficient; and specific data fitting processing is carried out to obtain a pure chemical shift-diffusion coefficient related two-dimensional diffusion spectrum, and the two-dimensional diffusion spectrum is used to directly detect the diffusion coefficient of every component in a sample and the error thereof and realize component separation of the sample. The method does not need a special sample processing process, is simple and easy, and is suitable for any routine nuclear magnetic resonance spectrometer.

The invention provides a high-resolution magnetic resonant method for measuring two-dimensional J decomposition spectrum of a coupling constant. The high-resolution magnetic resonant method comprisesthe steps of firstly, applying 90-degree hard pulse to allow a magnetic vector to rotate from a Z direction to an XY plane; secondly, applying an improved spin echo module. Such an effect is in a waythat core-correlated J coupling acting with selected 180-degree pulse is reunited with indirect dimension, so that other J couplings are maintained to be converted in the indirect dimension, and chemical displacement and all J couplings are converted at normal conversion time of direct dimension. By the method, two-dimensional J decomposition spectrum possessing a pure absorption line type can beobtained; after 45-degree rotation on the obtained two-dimensional spectrum, projection spectrum of direct dimension is in a way that pure chemical displacement spectrum of coupling division correlated to the selected core is only maintained, and thus, the J coupling constant can be conveniently measured; and division information of other couplings is maintained by projection of the indirect dimension, and multiplet-mode analysis is helped.

The invention provides an ultra-high resolution nuclear magnetic resonance phase-sensitive two-dimensional J decomposition spectrum method used for acquiring molecular structure information and accurately measuring a J coupling constant. The method is based on a combined action of a ZS decoupling module and an echo chain sampling module, shortcomings of an existing two-dimensional J-spectrum technology in practical applications are overcome, and a high-resolution two-dimensional phase-sensitive J-decomposition spectrum can be acquired under an uneven magnetic field environment. . By using themethod, a spectral resolution of the two-dimensional J decomposition spectrum is increased. The method is of great significance for structure detection of a complex sample of a crowded spectrum peak,and an application field of the two-dimensional J decomposition spectrum is expanded. And simultaneously, based on a monochromatic pulse excitation method, the invention provides a sensitivity enhancement method based on multi-color pulse excitation sampling realiztion.

The invention provides a nuclear magnetic resonance method of a two-dimensional J decomposition spectrum. The nuclear magnetic resonance method of the two-dimensional J decomposition spectrum is convenient for measuring a coupling constant. The method comprises the following steps of: firstly, applying a 90-degree hard pulse to rotate a magnetization vector from a Z direction to an XY plane; secondly, applying an improved spin echo module, namely inserting a selective 180-degree pulse into a conventional 't 1/2-180-degree-t 1/2' module; and finally, performing two-dimensional Fourier transformto obtain a two-dimensional spectrogram, wherein a signal separation mode arranged along 45 degrees in the conventional two-dimensional J decomposition spectrum is changed into two split signals arranged along 45 degrees, and the distance between the two signals is J coupling related to a kernel acted by the selective 180-degree pulse. The two-dimensional spectrum is rotated by 45 degrees and isprojected to a direct dimension to obtain a pure chemical displacement one-dimensional spectrum, but the J coupling related to the selected kernel is reserved. Therefore, the J coupling constant related to the selected kernel can be conveniently measured from a direct dimension projection spectrum.