80 results about "Spin–lattice relaxation" patented technology

The present invention pertains to an apparatus and method for conducting magnetic resonance measurements on fluids at high pressures and / or high temperatures. The apparatus can be used in conjunction with or as part of a downhole fluid sampling tool to perform NMR measurements on fluids withdrawn from petroleum reservoirs, or can also be used for laboratory measurements on live reservoir fluids. The apparatus can perform all of the measurements made by modern NMR logging tools, including multi-dimensional distribution functions of spin-spin (T2) and spin-lattice relaxation (T1) times and molecular diffusion coefficients. The spin densities of hydrogen and other NMR sensitive species can be computed from the distribution functions. The apparatus can also be used to predict the apparent conductivity of the fluids in the flowline from measurements of the quality factor (“Q”) of the NMR circuit. The apparent conductivity can be used to predict water cut or water salinity.

A non-invasive blood glucose measurement method using a magneto-resonance absorption method. A constant magnetic field is applied using a pair of permanent magnets, the magnetic field having a uniform strength. A triangular waveform low frequency modulation magnetic field is applied using a low frequency generator and a pair of low frequency coils, the low frequency modulation magnetic field having a uniform strength. A weak acoustic wave modulation magnetic field is applied using an acoustic wave generator and a pair of acoustic wave coils. Electromagnetic waves are applied to a detector in which a finger is positioned to produce a nuclear magneto-resonance, the electromagnetic waves having a frequency varying in a specific frequency band step by step, the applying being done using a high frequency generator and a sensor coil. A magneto-resonance absorption signal produced by spin-lattice relaxation of protons in a tissue of the finger because of the nuclear magneto-resonance is detected. A magneto-resonance spin-lattice relaxation time of the finger from the magneto-resonance absorption signal is determined. A blood glucose concentration in a human body is determined from a correlation between a pre-determined blood glucose concentration in the human body and the determined magneto-resonance spin-lattice relaxation time.

NMR spin echo signals are corrected for axial motion of the borehole logging tool. The correction is applied to an averaged echo train using an average velocity determined from surface measurements over the duration of averaging of the echo trains. An additional correction may be applied to correct for excess polarization or incomplete polarization of nuclear spins due to an insufficient wait time between pulse sequences.

The maximum luminous efficiency of organic light-emitting materials is increased through spin-dependent processing. The technique is applicable to all electro-luminescent processes in which light is produced by singlet exciton decay, and all devices which use such effects, including LEDs, super-radiant devices, amplified stimulated emission devices, lasers, other optical microcavity devices, electrically pumped optical amplifiers, and phosphorescence (Ph) based light emitting devices. In preferred embodiments, the emissive material is doped with an impurity, or otherwise modified, to increase the spin-lattice relaxation rate (i.e., decrease the spin-lattice time), and hence raise the efficiency of the device. The material may be a polymer, oligomer, small molecule, single crystal, molecular crystal, or fullerene. The impurity is preferably a magnetic or paramagnetic substance. The invention is applicable to IR, UV, and other electromagnetic radiation generation and is thus not limited to the visible region of the spectrum. The methods of the invention may also be combined with other techniques used to improve device performance.

A nuclear magnetic resonance (NMR) system and method for determining oil and water composition in drilling mud by separating out signals from oil and water in a two dimensional relaxation space wherein the oil and water ratio is a function of the separated out signals. The spin-lattice relaxation time distribution or a spin-spin relaxation time distribution of the sample is measured and a spin-lattice versus spin-spin or a spin-spin versus diffusion two-dimensional procedure is applied to separate the components of the drilling fluid. The signal intensities from the oil and water regions of the one-dimensional or two-dimensional NMR measurements are used to quantify the relative portion of the proton NMR signal from the oil and water and to determine the ratio of oil and water in the drilling mud.

A magnetic resonance imaging white matter hyperintensities region recognizing method and system are disclosed herein. The white matter hyperintensities region recognizing method includes receiving and storing a FLAIR MRI image, a spin-lattice relaxation time weighted MRI image, and a diffusion weighted MRI image. Registration and fusion are preformed, and a white matter mask is determined. An intersection image of the FLAIR MRI image and the white matter mask is taken, a first region is determined after normalizing the intersection image, a cerebral infarct region is removed from the first image through the diffusion weighted MRI image, and then a determination is made as to whether to remove a remaining region in order to form a white matter hyperintensities region in the FLAIR MRI image.

The invention discloses an NMR rapid detection method for food-borne pathogenic bacteria based on a paramagnetic nanometer Fe-Ni-Co alloy probe, belonging to the technical field of rapid detection of food-safe pathogenic bacteria. The present invention relies on the established NMR detection method that can be used for pathogenic bacteria in food samples, utilizes the influence of the paramagnetic properties of the paramagnetic nanometer Fe-Ni-Co alloy probe on the relaxation time of the NMR attenuation signal, and detects Determine whether the target bacteria are present in the sample. The different specific correspondences are: the paramagnetic nano-Fe-Ni-Co alloy probe shows a linear relationship under certain conditions, that is, the content of the nano-Fe-Ni-Co alloy is large, and the spin-lattice relaxation time of the sample The smaller the value of spin-spin relaxation time and spin-spin relaxation time, the target bacteria can be quantitatively detected in a certain range. The method can be used for rapid detection of harmful pathogenic bacteria in food samples, and thus can be used as a rapid screening of a large number of samples to be tested.

Gas generation of a non-aqueous electrolyte battery having a negative active material that intercalates / deintercalates lithium ions at a potential not lower than 1.2 V relative to the potential of lithium as negative electrode is suppressed.A non-aqueous electrolyte battery comprising a non-aqueous electrolyte containing an electrolyte salt and a non-aqueous solvent, a positive electrode and a negative electrode is characterized in that the main active material of said negative electrode is an active material that intercalates / deintercalates lithium ions at a potential not lower than 1.2 V relative to the potential of lithium and the auxiliary active material of said negative electrode is an active material that at least intercalates lithium ions at a potential lower than 1.2 V relative to the potential of lithium and that there exists lithium showing a spin-lattice relaxation time (T1) of not less than 1 second as determined by a solid-state Li—NMR measurement in the main active material of said negative electrode. A method of manufacturing a non-aqueous electrolyte battery containing a non-aqueous electrolyte, a positive electrode and a negative electrode (a main active material and an auxiliary active material of the negative electrode) is characterized in that the negative electrode potential is lowered to not higher than 0.8 V relative to the potential of lithium at least once in the initial cycle.

The invention discloses an angle and T1 simultaneous measurement method based on a hyperpolarized gas spectrum, and the method comprises the steps: collecting hyperpolarized gas; enabling a research object to obtain the hyperpolarized gas; fixing an excitation angle theta of a radio frequency pulse in one breath holding process, collecting a magnetic resonance spectrum of the hyperpolarized gas ofthe research object, and obtaining a free induction decay signal FID1 of the hyperpolarized gas of the research object in a variable repetition time TR1 and a free induction decay signal FID2 of thehyperpolarized gas of the research object in a fixed repetition time TR2; processing the FID1 and FID2 signals, and obtaining an actual excitation angle theta(r) of the radio frequency pulse and the spin-lattice relaxation time constant T1 of the hyperpolarized gas of the research object. According to the invention, the method can achieve the simultaneous obtaining of the angle and an analytical solution of T1, shortens the sampling time, reduces the requirements for hardware, is easy for engineering implementation, and is simple in data processing.