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99 results about "Spin relaxation time" patented technology

T2 Time. The T2 relaxation time (spin spin relaxation time or transverse relaxation time), is a biological parameter that is used in MRIs to distinguish between tissue types and is termed 'Time 2' or T2. It is a tissue-specific time constant for protons and is dependent on the exchanging of energy with near by nuclei.

Precise control method of atom spin SERF (Self-Exchange Relaxation-Free) state for stabilizing atom spin device

The invention relates to a precise control method of an atom spin SERF (Self-Exchange Relaxation-Free) state for stabilizing an atom spin device, which comprises the following steps that firstly, a precise equation is established for the atom spin SERF state, and a modulation method is adopted to measure the atom spin polarizability to establish a control target; then a control system model as precise as possible is established on the basis of an SERF model, and a parameter identification method is adopted to estimate unknown parameters of the model; and finally, according to the control target, a special structure design control law of the established model is fully used, i.e. the switching time, frequency, orientation and power of laser and the switching time of a modulation magnetic field are optimized, and the atom spin SERF state is precisely controlled in real time in accordance with a quantum control algorithm. By using the precise control method, the atom spin relaxation time is increased, and the problem of instability of scale factors of atom devices such as an atom spin gyroscope and an atom magnetometer based on the atom spin SERF effect is solved. The precise control method can be used for improving the long-time drift precision and the low-frequency sensitivity based on the SERF atom spin device.
Owner:BEIHANG UNIV

Method for screening anaerobe traditional Chinese medicine inhibitor on basis of ZnO nanoprobe

The invention relates to a method for screening an anaerobe traditional Chinese medicine inhibitor on basis of a ZnO nanoprobe and belongs to the technical field of traditional Chinese medicine development and application. The method depends on establishment of a method based on the prepared ZnO nanoprobe and used for screening a traditional Chinese medicine formula for inhibiting anaerobes. Whether a sample contains target bacteria is detected by using the characteristic that the antibody-coated magnetic ZnO nanoprobe can perform specific combination on the target bacteria and by using the effect of the magnetic characteristic of ZnO on nuclear magnetic resonance relaxation time. The magnetic ZnO nanoprobe has a linear relation with the nuclear magnetic resonance relaxation time within a certain range, that is, the higher the nano ZnO content, the shorter the nuclear magnetic resonance spin-lattice relaxation time and spin-spin relaxation time of the sampler is, the target bacteria can be detected quantitatively in a certain range, and the antibacterial effect of the traditional Chinese medicine formula is indirectly evaluated. The method can be used for screening the traditional Chinese medicine formula having the inhibition effect on the anaerobes and increase the development speed of traditional Chinese medicine products.
Owner:NANCHANG UNIV
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