76 results about "Spin system" patented technology

Systems and methods for magnetic sensing and imaging include a sensor having a network of isolated electron-spin quantum bits (qubits) disposed on the surface of the sensor; and a solid state electronic spin system disposed below the surface of the sensor, wherein the solid state electronic spin system has a spin-state dependent fluorescence; a source of light; a source of first external perturbation, wherein the source of first external perturbation generates a magnetic field; a source of second external perturbation; wherein, the source of light and the first and second external perturbations are configured to coherently and independently manipulate the spin states of at least one qubit and at least one solid state electronic spin system; and a detector to optically measure the solid-state electronic spins spin-state dependent fluorescence.

In a method for rephasing a first spin system in a first slice with a first coherence curve and a second spin system of a second slice with a second coherence curve, in the generation of MR images with slice multiplexing, a first RF pulse deflects the spin system of the first slice and a second RF pulse deflects the spin system of the second slice. The beginning of the second RF pulse is time-shifted with respect to the beginning of the first RF pulse by a time period that is shorter than the duration of the first RF pulse. A rephasing correction impresses a correction phase on at least one of the spin systems, and signals of the spin systems are respectively detected. The coherence curves are rephased so detection of the signals occurs simultaneously.

The magnetic material for magnetic refrigeration of the present invention is characterized by exhibiting, in a certain temperature region, preferably, only in part of a temperature region from 200 K to 350 K, an inflection point at which a second order differential coefficient of a magnetization curve changes from positive to negative with respect to a magnetic field, within the range of this magnetic field formed using a permanent magnet unit. This magnetic material of the present invention can generate a low temperature by using a relatively low magnetic field, by transferring the entropy between the electron spin system and the lattice system near the temperature at which an inflection point appears on the magnetization curve. Examples of the magnetic material meeting this condition are La(Fe,Si)13, (Hf,Ta)Fe2, (Ti,Sc)Fe2, and (Nb,Mo)Fe2, each containing 50 to 60 atomic % of transition metals such as Fe.

The invention relates to a spiral trench-shaped electrostatic spinning device comprising a liquid supplying system, a spiral trench-shaped spinning system and a nano-fiber collecting system. The liquid supplying system has an air bottle, a spinning liquid storage bottle, an oil bath groove and a liquid guiding pipeline; the liquid guiding pipe is disposed in the oil bath groove; the liquid guiding pipe passes through a rotating shaft; the upper end of the liquid guiding pipe is arranged on the bottom of the spinning liquid storage bottle and the lower end is arranged on the top of a spiral trench-shaped sprayer; the spinning liquid storage bottle and the liquid guiding pipe form a connector structure on the top of the spiral trench-shaped sprayer; the spinning liquid storage liquid is connected with the air bottle via an air pipe; a total valve and a reducing valve are orderly arranged on a place on the air pipe and close to the air bottle; and the spiral trench-shaped spinning system has a motor, a transmission belt, a rotating shaft, a spiral trench-shaped sprayer and a cylindrical seat. High-polymer solution can be automatically fed by the sprayer and controlled with liquid supplying system connected with the top of the spiral trench-shaped sprayer via the air-pressure connector; and the spiral trench-shaped electrostatic spinning device can be simply operated and easy to handle.

The invention relates to an NV color center gyro fluorescence collection system and in particular relates to a high-efficiency fluorescence detection device based on a solid-state spin system. The device comprises a 532 laser machine, wherein a polarizing film, a first convex lens, an acoustic optical modulator, a second convex lens and a fourth convex lens are sequentially arranged on a light path of the 532 laser machine; the fourth convex lens is directly opposite to a diamond; the diamond is arranged on a filter; the lower side of the filter is in contact with a photodiode; a prism reflector is arranged on the filter; the photodiode is connected with a lock-in amplifier; the lock-in amplifier is respectively connected with a PID (Proportion Integration Differentiation) controller and an acquisition card; the output end of the PID controller is connected with a microwave source; a signal source output end is respectively connected with the lock-in amplifier and the microwave source; and a radio frequency antenna is connected to the microwave source. According to the device disclosed by the invention, fluorescence side band collection is realized, the traditional confocal measurement method is replaced, the improved system structure is greatly simplified, the collection efficiency is greatly improved, and the device is very suitable for miniaturized installation and lays a foundation for later system integration.

The invention relates to a device (1) for magnetic resonance imaging of a body (7), comprising a main magnet (2) for generation of a stationary and substantially homogeneous main magnetic field within the examination zone, a plurality of wireless receiving units (10a, 10b) placed in or near the examination zone, and sampling means (21a, 21b) operating at a variable sampling frequency for sampling the received MR signals and for converting them into digital signal samples. In order to provide an MR device (1), which is arranged to inductively energize the wireless receiving units (10a, 10b) without interference with the nuclear spin system of the examined object (7) and which does not necessarily require bulky energy storage means for the operation of the wireless receiving units (10a, 10b), the invention proposes to make provision for energizing means (17) generating an RF energizing field within the examination zone for inductively supplying electric power to the wireless receiving units (10a, 10b), wherein the frequency of the RF energizing field is an integer multiple of the sampling frequency.

The invention discloses a device and a method for preparing directionally arranged fiber by a solution blow-spinning technology. The device comprises a solution blow-spinning system and a system for collecting fiber directionally arranged by airflow; the solution blow-spinning system comprises a spinning solution, an airflow control system and a blow-spinning device; the blow-spinning device, a spinning solution and the airflow control system are connected; a spinning collection system comprises a paving collection net; the paving collection net is connected with a negative pressure device; and the solution blow-spinning system collects directionally arranged nanometer fiber on the paving collection net by adjusting the angle of the spinning air flow and the paving collection net and by taking high-speed airflow as a directional driving force. The device and the method are relatively simple to operate, have many adjustable parameters and are high in precision; and the fiber obtained through preparation is high in arrangement degree, large in preparation quantity and high in uniformity.

The disclosure concerns a magnetometer for detecting a magnetic field, comprising: a solid state electronic spin system containing a plurality of electronic spins and a solid carrier, wherein the electronic spins are configured to be capable of aligning with an external magnetic field in response to an alignment stimulus; and a detector configured to detect an alignment response of the electronic spins, such that the external magnetic field can be detected; wherein the electronic spins are provided as one or more groups, each group containing a plurality of spins, the plurality of spins in each of the one or more groups being arranged in a line that is angled at an angle Θ with respect to the local direction of the external magnetic field at the said group. Also disclosed is a method for detecting a magnetic field.

In a method and apparatus for detection and spectral editing in MR spectroscopy by polarization transfer in which the high spin population difference of two or more energy levels of a particular nuclear spin system is transferred to the energy levels of an other nuclear spin system with lower spin population difference, all RF pulses to be irradiated are irradiated sequentially, i.e. with defined time interval to each other, so that at no time of the sequence are different RF pulses irradiated concurrently in an overlapping manner. The sequential succession of the RF pulses causes the polarization transfer between the two spin systems of atomic nuclei involved. The sequence of the RF pulses in each domain of the respective nuclei is completely symmetric.

The invention discloses a device used in a multi-level carding rotor spinning method. The device comprises a spinning system and a computer control system. The spinning system comprises a feeding and carding mechanism, a gathering and twisting mechanism and a winding forming mechanism. The device is characterized in that the feeding and carding mechanism comprises a combined cotton feeding roller with four rotating freedom degrees and a multi-level carding roller, and the speed ratio of four roller bodies of the combined cotton feeding roller with the four rotating freedom degrees is adjustable. The yarn density and the blending ratio of rotor spun yarns can be adjusted and controlled at will.

The invention discloses a parallel magnetic resonance method based on dynamical nuclear polarization multinuclear simultaneous enhancement. An electronic-nuclear spin system is located in a magnetic field with the strength of B0; the electronic-nuclear spin system is irradiated through microwaves; microwave irradiation is stopped; nuclear magnetic resonance pulses are applied; enhancement signals of atomic nucleuses corresponding to all channels are collected; enhancement spectrograms or images are reestablished and obtained. Under the condition of saturated electrons, signal enhancement of multiple atomic nucleuses can be obtained at the same time. The mutual relation between different atomic nucleuses and electrons and the mutual relation between the atomic nucleuses can be obtained at the same time. Under the condition of a single saturated electron, enhancement images of different atomic nucleuses can be obtained at the same time, and the two-dimensional and multi-dimensional spectrograms of different atomic nucleuses can be obtained.

The invention relates to a magnetic resonance imaging method for simultaneous and dynamic determination of a longitudinal relaxation time T1 and a transversal relaxation time T2 of the nuclear spin system of an object, in the context of DCE or DSE MRI. In this respect, the invention makes use of a steady-state gradient echo pulse sequence comprising an EPI readout module.

Methods and systems are provided for the deconvolution of the NMR spectrum of a mixture into individual components and spin systems by combining covariance total correlation spectroscopy (TOCSY) spectra with covariance NMR. The method may include obtaining a 2D TOCSY spectra of a chemical mixture and then performing a series of analytical steps to identify the individual components of the mixture.

The invention relates to a preparation device for micro-nanofibers, and aims to provide a spinning device for preparation of micro-nanofibers. The spinning device comprises a collection system, a spinning system and a continuous feeding system, wherein the spinning system comprises a motor, an insulating coupling and a spinner; rotating shafts of the motor and the spinner are both vertically mounted and connected through the insulating coupling; the main body of the spinner is hollow, and a spinning solution inlet is formed in the upper part of the spinner; a plurality of dispense needles are arranged outside the main body of the spinner in a surrounding manner and communicated with the interior of the spinner through connecting pieces. The spinning device can effectively collect fibers, more equipment can be arranged on a limited field, continuous production can be realized, and the production efficiency is improved; the thickness uniformity of fibrous membranes can be effectively adjusted, the content of beads of an obtained micro-nanofiber web is greatly reduced, and the electrostatic function contributes to improvement of the mechanical property of the fibers.

A method and apparatus for producing a hyperpolarized sample material for use in an NMR investigation provides for a cryogenic region having a target material containing a first hyperpolarizable nuclear species, a second hyperpolarizable nuclear species, and a nuclear spin polarizing agent, wherein the first nuclear species has a higher magnetic moment than the second nuclear species. Microwave energy is used to excite electron spin transitions in the polarizing agent in the presence of a magnetic field. The first hyperpolarizable nuclear species is thereby caused to interact with the electron spin system in the polarizing agent and generate hyperpolarization of at least the first nuclear species of the target material. The target material is then subjected to a lowered magnetic field, wherein the lowered magnetic field facilitates polarization transfer by nuclear thermal mixing between the species to thereby hyperpolarize the second nuclear species.

The invention relates to a spinning method of a woolen spinning system for spinning wrap yarns. The spinning method comprises a first kind of spinning method, a second kind of spinning method, a third kind of spinning method, a fourth kind of spinning method and a fifth kind of spinning method. The first kind of spinning method comprises the concrete steps that chemical fiber filaments are directly fed into a hollow spindle from a front roller through a feeding roller instead of a drafting device; a bobbin of woolen spun yarns sleeves the hollow spindle and is rotated along with the hollow spindle to wind on the filaments, and yarn covered filament type fasciated yarns of woolen spun yarn covered chemical fiber filaments are obtained, wherein the drafting device sequentially comprises a rear roller, a middle roller and a front roller from top to bottom, and the rear roller, the middle roller and the front roller are arrayed slantways. According to the spinning method of the woolen spinning system for spinning the wrap yarns, different types of wrap yarns are spun through selecting different drafting devices, and the process step is simple, and the prepared wrap yarns are good in hand feeling, good in heat preservation and uniform in finished yarns.

The invention relates to an electrostatic spinning device for preparing nano-fiber in batch. The device comprises a liquid storage groove which stores a spinning solution, a spinning system is arranged in the liquid storage groove, a receiving device is arranged above the spinning system, and a spray nozzle rotation system and a high-voltage electrostatic generator are connected to the spinning system; the spinning system comprises a center shaft which is arranged in the liquid storage groove, a spray nozzle is arranged on the center shaft, adjustment sleeves are arranged between the spray nozzle and the center shaft, and two ends of the center extend out of the liquid storage groove and are connected with the spray nozzle rotation system and the high-voltage electrostatic generator respectively. According to the electrostatic spinning device, the production efficiency of nano-fiber preparation is high, the controllability is good, the problems can be solved that the spinning solution volatilizes easily in the spinning process and a traditional spray nozzle is easily blocked, and the batch production by using electrostatic spinning for preparing the nano-fiber can be achieved.

The invention relates to a magneto-optical switching device for switching magnetization in a medium, comprising a magnetizable medium. According to the invention, a radiation system suited for imparting angular momentum to the magnetic spin system of said magnetizable medium, so as to selectively orient the magnetization of said medium. In addition, the invention relates to a method of switching a magnetizable medium, comprising providing a magnetizable medium; providing a radiation beam of a selectively chosen angular momentum; and targeting said radiation beam to said medium so as to transfer said angular momentum to a magnetic spin system of said magnetizable medium. Accordingly, spin states in magnetic materials can be manipulated using radiation of a suitable angular momentum. An effective magnetic field is generated for orienting the magnetization of the domains and can simultaneously be used to locally heat the material.

A magnetic resonance method and system for generation of an optimized MR image of an examination subject operate as follows. A pulse sequence including a series of at least two RF pulses is radiated into the examination subject to generate at least one optimized signal, wherein the second and possibly every additional RF pulse is radiated before the effect of the first or a preceding RF pulse on the spin system in the examination subject has decayed. The radiated RF pulses are generated by parallel transmission coils. At least the signal resulting after the last radiated RF pulse of the pulse sequence is acquired. The pulse sequence is repeated with modified spatial coding until signals have been generated and acquired in a desired positional space. The optimized MR image per pulse sequence is calculated from at least one of the acquired signals.

Apparatus and method establish quantum oscillations at room temperature. A cavity has therein a resonator structure that includes a resonant element and a gain medium. A species of the gain medium has an electronic spin multiplicity capable of supporting a two-level spin system. An optical pump pumps the resonator structure and thereby generates microwave output power through stimulated emission of thermal photons. The species of the gain medium is of a sufficiently high concentration such as to have an ensemble spin-photon coupling rate which exceeds both the cavity mode decay rate and the spin-spin decoherence rate. The optical pump pumps the resonator structure using a short pulse of nanosecond duration, or a burst of approximately a millisecond in duration at relatively low instantaneous optical power, to excite said species of the gain medium into a spin-polarized two-level system that exhibits quantum oscillations in the microwave output power.

A device for multi-level carding rotor spinning method comprises a spinning system and a computer control system. The spinning system comprises a feeding carding mechanism, a condensation twisting mechanism and a winding molding mechanism. The device is characterized in that the feeding carding mechanism comprises combined cotton feeding rollers at five rotation freedom degrees and multiple levels of carding rollers. The speed ratio of the five rollers of the combined cotton feeding rollers at the five rotation freedom degrees can be adjusted, so that the linear density and the blending ratio of rotor spun yarn are randomly adjusted.

The invention discloses a spinning system and spinning method of a high-strength DTY composite yarn. The DTY composite yarn is formed in the manner that a POY and an FDY are stranded after twisting and drafting are carried out on the POY. A strength waveform graph of the twisted POY is matched with a strength waveform graph of the FDY. The strength of the POY and the strength of the FDY are increased to the maximum, meanwhile, the strength waveform graph of the POY and the strength waveform graph of the FDY are consistent in fluctuation, the strength of the elasticized DTY is greatly increased, the DTY strength can be increased to 3.6 from existing 3.2, and the increasing amplitude is 12.5 percent.

The invention relates to a spinning system, and belongs to the technical field of pipe processing. The spinning system comprises a first spinning machine, a second spinning machine and a swing transferring system; the first spinning machine comprises a first clamping jaw; the second spinning machine comprises a second clamping jaw; the swing transferring system comprises a mounting base, a swing arm, a swing driving device, a pushing device and a pipe clamping unit arranged on the swing end of the swing arm; the swing driving device is used for driving the swing arm to swing relative to the mounting base, so that the swinging end can swing from a first position to a second position, in the first position, the pipe clamping unit can be used for discharging a pipe from the first clamping jaw, and in the second position, the pipe clamping unit can be coordinated with the pushing device for feeding the second clamping jaw; and the pushing device is used for pushing the pipe clamped on thepipe clamping unit to the second clamping claw. According to the spinning system, the pipe can be automatically conveyed between the two spinning machines so as to carry out repeated spinning processing, and the spinning system is high in automation degree, capable of saving manufacturing cost and capable of being widely applied to the fields of refrigeration, automobiles, aviation and the like.