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707 results about "High magnetic field" patented technology
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Operating agency. The National High Magnetic Field Laboratory (MagLab) is a facility at Florida State University, the University of Florida, and Los Alamos National Laboratory in New Mexico, that performs magnetic field research in physics, biology, bioengineering, chemistry, geochemistry, biochemistry.
High sensitivity magnetic built-in current sensor
InactiveUS7619431B2Improve sensor sensitivityHigh sensitivityMagnetic measurementsDigital storageElectrical conductorEngineering
A sensor for contactlessly detecting currents, has a sensor element having a magnetic tunnel junction (MTJ), and detection circuitry, the sensor element having a resistance which varies with the magnetic field, and the detection circuitry is arranged to detect a tunnel current flowing through the tunnel junction. The sensor element may share an MTJ stack with memory elements. Also it can provide easy integration with next generation CMOS processes, including MRAM technology, be more compact, and use less power. Solutions for increasing sensitivity of the sensor, such as providing a flux concentrator, and for generating higher magnetic fields with a same current, such as forming L-shaped conductor elements, are given. The greater sensitivity enables less post processing to be used, to save power for applications such as mobile devices. Applications include current sensors, built-in current sensors, and IDDQ and IDDT testing, even for next generation CMOS processes.
Owner:ELIPOSKI REMOTE
LED lighting system for use in environments with high magnetics fields or that require low EMI emissions
ActiveUS20070121328A1Highly specular reflective surfaceEliminate glarePlanar light sourcesPoint-like light sourceEffect lightEngineering
This invention is a non-ferrous lighting fixture and non-ferrous lighting system that can be used in areas with high magnetic fields or that require low EMI emissions, such as MRI operating rooms. This invention uses LED's to provide a high-intensity, quality white or other color light that is softened by reflectors and diffusers, and can be dimmed to provide flexible lighting levels. The flexible lighting levels can range from the maximum light used for patient procedures and equipment servicing / maintenance to the lowest light level used to keep a patient comfortable while facing upward on the MRI scanning table. Moreover, by using an aluminum substrate printed circuit board, this invention resolves the thermal issues associated with high-intensity lighting. Not only does this invention resolve glare and hot spot issues, it protects the user and installer from electrical hazards associated with potentially high voltages, as well. Finally, because this invention is completely non-ferrous, it does not interfere with the integrity of the MRI equipment's readings.
Owner:EVERBRITE
Particle-Based Microfluidic Device for Providing High Magnetic Field Gradients
InactiveUS20100044232A1Bioreactor/fermenter combinationsElectrostatic separatorsParticulatesMagnetic field gradient
A microfluidic device for manipulating particles in a fluid has a device body that defines a main channel therein, in which the main channel has an inlet and an outlet. The device body further defines a particulate diverting channel therein, the particulate diverting channel being in fluid connection with the main channel between the inlet and the outlet of the main channel and having a particulate outlet. The microfluidic device also has a plurality of microparticles arranged proximate or in the main channel between the inlet of the main channel and the fluid connection of the particulate diverting channel to the main channel. The plurality of microparticles each comprises a material in a composition thereof having a magnetic susceptibility suitable to cause concentration of magnetic field lines of an applied magnetic field while in operation. A microfluidic particle-manipulation system has a microfluidic particle-manipulation device and a magnet disposed proximate the microfluidic particle-manipulation device.
Owner:RGT UNIV OF CALIFORNIA
Method of using a small MRI scanner
InactiveUS20050154291A1Close accessMore accessDiagnostic recording/measuringSensorsCost effectivenessWhole body
Multiple methods of performing whole body scans using a cost-effective small magnetic resonance imaging (MRI) system are disclosed. High magnetic field homogeneity of an open, small MRI is obtained by a combination of passive shimming and high order active shimming. A dynamic shimming while imaging (DSWI) method is provided to dynamically optimize field homogeneity for each scanned slab (slice) during imaging. Also provided is a method that scan a large subject volume only using a limited optimal imaging region of a magnet by continuously adjusting patient position and orientations with a 6 degrees of freedom patient table.
Owner:ZHAO LEI +2
Compact self-tuned electrical resonator for buried object locator applications
ActiveUS7276910B2Improved efficiency and induced output powerLower equivalent series resistanceDetection of traffic movementResonatorsCapacitanceElectrical conductor
A self-tuning resonator for use in a transmitter apparatus for inducing alternating currents in a buried conductor. The resonator is dynamically tuned at frequencies below 500 kHz by exploiting the inherent voltage-variability of net capacitance in multilayer ceramic capacitors. The transmitter apparatus provides improved efficiency and induced output power suitable for use in a man-portable locator system, providing a very high magnetic field output from a physically small battery-powered resonator at frequencies under 500 kHz. The resonator exhibits a very low equivalent series resistance (ESR) and is adaptively returned to a predetermined resonant frequency responsive to any changes in resonance arising from phenomena such as component heating, thereby supporting very high tank circuit currents from battery-powered source to produce very high magnetic flux output.
Owner:SEEK TECH
Plasma processing system with locally-efficient inductive plasma coupling
InactiveUS20050103445A1Improving uniformity of plasma processElectric discharge tubesVacuum evaporation coatingElectrical conductorEtching
An inductively coupled plasma source is provided with a peripheral ionization source for producing a high-density plasma in a vacuum chamber for semiconductor wafer coating or etching. The source includes a segmented configuration having high and low radiation segments and produces a generally ring-shaped array of energy concentrations in the plasma around the periphery of the chamber. Energy is coupled from a segmented low inductance antenna through a dielectric window or array of windows and through a segmented shield or baffle. The antenna has concentrated conductor segments through which current flows in one or more small cross-section conductors to produce high magnetic fields that couple through the high-transparency shield segments into the chamber, while alternating distributed conductor segments, formed of large cross-section conductor portions or diverging small conductor sections, permit magnetic fields to pass through or between the conductors and deliver only weak fields, which are aligned with opaque shield sections and couple insignificant energy to the plasma. The source provides spatial control of plasma energy distribution, which aids in control of the uniformity of plasma processing across the surface of the semiconductor being processed.
Owner:TOKYO ELECTRON LTD
Homopolar machine with shaft axial thrust compensation for reduced thrust bearing wear and noise
InactiveUS6856062B2Reduce induced magnetic forceConstant contact pressureRotary current collectorMagnetic bodiesFiberContact pressure
A homopolar machine produces an axial counter force on the rotating shaft to compensate for the load on the shaft's thrust bearing to reduce wear and noise and prolong bearing life. The counter force is produced through magnetic interaction between the shaft and the machine's field coils and is created by changing the current excitation of the field coils, which results in a magnetic flux asymmetry in an inner flux return coupled to the shaft. The homopolar machine may also have a configuration that uses current collectors that maintain substantially constant contact pressure in the presence of high magnetic fields to improve current collector performance. The current collectors are flexible and may be made from either electrically conductive fibers or stacked strips such that they bear up against the armature so that the pressure is maintained by the spring constant of the current collector material. The homopolar machine may also have a configuration where the brushes are oriented so that the current is aligned as much as is practical with the local magnetic field lines so as to reduce the lateral electromagnetic forces on the brushes.
Owner:GENERAL ATOMICS
Maintaining the alignment of electric and magnetic fields in an x-ray tube operated in a magnetic field
InactiveUS6976953B1Easy to controlDeflection of the electron beam by the static magnetic field is reduced or eliminatedElectric shock equipmentsMagnetic measurementsLight beamTransverse magnetic field
A new technique for maintaining the alignment of electric and magnetic fields in an x-ray tube so the tube can be operated in the presence of a static external magnetic field without being negatively affected thereby. Deflection of the electron beam of the x-ray tube by the high magnetic field is reduced or eliminated by modifying or canceling, at a location near the electron beam, the magnetic field components transverse to the beam. In a preferred embodiment, a set of electromagnet coils are positioned on or near the tube and oriented in a way that when current is applied internal magnetic fields are produced in a direction opposite to the transverse magnetic fields, thereby causing cancellation. In one implementation, one or more sensors are used to detect the transverse magnetic fields. The sensor is positioned near the electron beam, either inside or outside the x-ray tube. The sensor produces a signal dependent on a static magnetic field component transverse to the desired direction of the electron beam. This signal is used to control the amount of current applied to the coils. A controller and a feedback circuit may be included to adjust in real time the amount of current being applied.
Owner:THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
Inertial rotation device
InactiveUS6940210B2Reduce clamping forceEasy to operatePiezoelectric/electrostriction/magnetostriction machinesNanotechnologyElectricityPiezoelectric actuators
An inertial positioning device comprising: a base plate (10); a top plate (20) for mounting an element to be rotated; a rotation member (16) having a column (18) on which the top plate is mounted in frictional engagement for slip-stick rotational motion; and a pair of piezoelectric actuators (12) each secured to the base plate at one end and to lateral extensions (17) of the rotation member at their other ends. Simultaneous actuation of the piezoelectric actuators rotates the column of the rotation member about its axis. When a suitable asymmetric drive signal is supplied to the piezoelectric actuators, the top plate is rotated by slip-stick motion. The device is compact, has a good load capacity for an inertial motor and is operable in extreme environments such as liquid helium temperatures, high vacuum and high magnetic fields.
Owner:ATTOCUBE SYST AG
Magnetoresistive flux focusing eddy current flaw detection
InactiveUS6888346B2Effectively deep flawIncrease flux densityMagnetic property measurementsMaterial magnetic variablesHigh fluxHand held
A giant magnetoresistive flux focusing eddy current device effectively detects deep flaws in thick multilayer conductive materials. The probe uses an excitation coil to induce eddy currents in conducting material perpendicularly oriented to the coil's longitudinal axis. A giant magnetoresistive (GMR) sensor, surrounded by the excitation coil, is used to detect generated fields. Between the excitation coil and GMR sensor is a highly permeable flux focusing lens which magnetically separates the GMR sensor and excitation coil and produces high flux density at the outer edge of the GMR sensor. The use of feedback inside the flux focusing lens enables complete cancellation of the leakage fields at the GMR sensor location and biasing of the GMR sensor to a location of high magnetic field sensitivity. In an alternate embodiment, a permanent magnet is positioned adjacent to the GMR sensor to accomplish the biasing. Experimental results have demonstrated identification of flaws up to 1 cm deep in aluminum alloy structures. To detect deep flaws about circular fasteners or inhomogeneities in thick multilayer conductive materials, the device is mounted in a hand-held rotating probe assembly that is connected to a computer for system control, data acquisition, processing and storage.
Owner:NASA
Entertainment system for use during the operation of a magnetic resonance imaging device
InactiveUS20100238362A1Reduce anxietyReduce noiseTelevision system detailsEar treatmentLow-pass filterEyewear
An entertainment system for use with a magnetic resonance imaging (MRI) device that includes video glasses and headphones. A Faraday shield encloses the entertainment system to reduce adequately RF signals from entering or leaving the entertainment system. The entertainment system may have non-ferromagnetic RF low-pass filters between parts of the system, such as the control unit and the video glasses, to reduce higher RF signals from entering or leaving those parts. To replace the battery and or entertainment media, a person opens the entertainment system's Faraday shield when not MRI imaging or outside the MRI magnet room. The door has an Faraday shield overlapping the system Faraday shield and making low resistance RF contact. The entertainment system has a minimal amount of ferromagnetic material so that it may operate within the high magnetic field of the MRI magnet bore with minimal performance degradation. The entertainment system uses non-ferromagnetic speakers in the headphone. Passive ear protection and noise cancellation reduce the loud noise of the MRI system heard by the patient to a level where the patient can hear the entertainment. The entertainment system includes a charger for the rechargeable batteries.
Owner:HUGHES BRIAN
Hybrid welding method and hybrid welding equipment for laser electromagnetic pulse
ActiveCN103737176AImprove adoption efficiencyReduce welding defectsLaser beam welding apparatusStructural deformationMetallic materials
The invention discloses a hybrid welding method and hybrid welding equipment for laser electromagnetic pulse. The method can be used for laser seam welding and laser spot welding technology, a pulsed high magnetic field is applied to a welding region during the process of laser welding on a workpiece with the effect of laser beams so as to mutually react with an induced plasma, a welding pool and a stress strain field through welding and complete welding task. The equipment comprises a laser device, an electromagnetic pulse generator, a numerical control system, an optical transmission system and a laser electromagnetic pulse combined machining head. The combined machining head is used for integrating the laser beams with the pulsed high magnetic field and adjusting the distance between an electromagnetic conversion device and the workpiece; the combined machining head is arranged on a machine tool. The structural deformation can be reduced, the welding quality and machining efficiency are improved, and insurmountable technical problems when a metallic material structure is manufactured through existing single welding technology are solved.
Owner:武汉飞能达激光技术有限公司
Rubidium atomic magnetometer and magnetic field measuring method thereof
ActiveCN107015172ALarge measuring rangeMagnetic field sampling rate adjustableMagnetic field measurement using magneto-optic devicesData acquisitionWork flow
The invention discloses a rubidium atomic magnetometer and a magnetic field measuring method. Based on the principle of nonlinear magneto-optic rotation, and through combination of timing control and tracking type frequency locking control, the atomic magnetometer achieves a large dynamic measurement range, high magnetic field sampling rate and high sensitivity. A DSP timing control module controls on-off of an acousto-optic modulator and a radio-frequency signal source in the physical part of the rubidium atomic magnetometer according to timing combination to adjust the magnetic field sampling rate N. The DSP timing control module further controls acquisition triggering of a data acquisition card. A calculation unit gets the Larmor precession frequency (f) through fast Fourier transform with use of a received rubidium atom Larmor precession free relaxation signal, and further calculates the value of an external magnetic field. The calculation unit selects a high magnetic field sampling rate module or a low magnetic field sampling rate module before measurement according to the pre-judged dynamic range of a to-be-measured magnetic field, and sets whether a tracking type frequency locking work mode is used when the low magnetic field sampling rate module is selected. In the working process, data is acquired and processed, and the value of the magnetic field is output.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
High-efficiency soft magnetic composite material and preparation method thereof
ActiveCN102136331AHigh resistivityHigh saturation magnetic inductionInorganic material magnetismMagnetic phaseAlloy
The invention discloses a high-efficiency soft magnetic composite material and a preparation method thereof. The material is in a nest wall structure composed of soft ferrite of high electrical resistivity; the ferrite in the nest wall structure completely isolates the soft magnetic metal in the nest or an alloy particle soft magnetic phase to cause the soft magnetic metal in the nest or the alloy particle soft magnetic phase to mutually isolate; the content of the soft magnetic metal or the alloy particle is 50-99wt%; and the balance is the soft ferrite. The preparation method comprises the following steps: mixing the soft magnetic metal or alloy particles and the soft ferrite powder at a ratio; causing the soft ferrite powder to completely and evenly coat the surface of the soft magnetic metal or the alloy particles; complexly sintering and shaping by spark plasma sintering densification; and finally, carrying out stress removal annealing heat treatment. The high-efficiency soft magnetic composite material has the characteristics of high-saturation induction density, high resistivity, high magnetic conductivity, low coercive force, low magnetic core loss and excellent comprehensive mechanical property. The high-efficiency soft magnetic composite material can be applied to occasions with higher working efficiency, high magnetic field and high stress. The preparation method issimple and the technological operation is convenient.
Owner:CHANGCHUN UNIV OF TECH
LED lighting system for use in environments with high magnetics fields or that require low EMI emissions
ActiveUS7629570B2Highly specular reflective surfaceEliminate glarePlanar light sourcesPoint-like light sourceEffect lightEngineering
This invention is a non-ferrous lighting fixture and non-ferrous lighting system that can be used in areas with high magnetic fields or that require low EMI emissions, such as MRI operating rooms. This invention uses LED's to provide a high-intensity, quality white or other color light that is softened by reflectors and diffusers, and can be dimmed to provide flexible lighting levels. The flexible lighting levels can range from the maximum light used for patient procedures and equipment servicing / maintenance to the lowest light level used to keep a patient comfortable while facing upward on the MRI scanning table. Moreover, by using an aluminum substrate printed circuit board, this invention resolves the thermal issues associated with high-intensity lighting. Not only does this invention resolve glare and hot spot issues, it protects the user and installer from electrical hazards associated with potentially high voltages, as well. Finally, because this invention is completely non-ferrous, it does not interfere with the integrity of the MRI equipment's readings.
Owner:EVERBRITE
Apparatus, device and method for generating magnetic field gradient
InactiveUS7015780B2High magnetic field gradientAvoiding magnetic particle debrisElectromagnets without armaturesPermanent magnetsMagnetic field gradientActuator
A monolithic or dual monolithic magnetic device or apparatus having an array of formations such as protruding or raised nubs wherein adjacent nubs have the same or opposite polarity to produce a high magnetic field gradient in the vicinity of the nubs is described. In lieu of nubs, the use of a magnetic device with thru-holes, blind holes, filled holes, or iron flux concentrators is also detailed, wherein all embodiments result in regions of high magnetic field gradient. Apparatus and methods for spot-poling a magnet array are also illustrated.An application of an array of MEMS actuators using the magnets of the present invention to produce high field gradient at precise locations is described. A further application of a biochemical separation unit containing a magnetic array and micro-fluidic channels for separating out magnetic particles tagged with bio-specific molecules for sensing the presence of a disease or specified chemicals is also described.
Owner:JDS UNIPHASE CORP
High magnetic field ohmically decoupled non-contact technology
Methods and apparatus are described for high magnetic field ohmically decoupled non-contact treatment of conductive materials in a high magnetic field. A method includes applying a high magnetic field to at least a portion of a conductive material; and applying an inductive magnetic field to at least a fraction of the conductive material to induce a surface current within the fraction of the conductive material, the surface current generating a substantially bi-directional force that defines a vibration. The high magnetic field and the inductive magnetic field are substantially confocal, the fraction of the conductive material is located within the portion of the conductive material and ohmic heating from the surface current is ohmically decoupled from the vibration. An apparatus includes a high magnetic field coil defining an applied high magnetic field; an inductive magnetic field coil coupled to the high magnetic field coil, the inductive magnetic field coil defining an applied inductive magnetic field; and a processing zone located within both the applied high magnetic field and the applied inductive magnetic field. The high magnetic field and the inductive magnetic field are substantially confocal, and ohmic heating of a conductive material located in the processing zone is ohmically decoupled from a vibration of the conductive material.
Owner:UT BATTELLE LLC
Permanent magnet oxysome magnetic shoe and producing method thereof
InactiveCN101022052AHigh densityHigh strengthInorganic material magnetismInductances/transformers/magnets manufactureSlurryFerric
This invention relates to a magnetic shoe of a magnet ferrite and its manufacturing mehod including the following composition: iron red and SrCO3 96.4-97.2%, additive: CaCO31-1.2%, SiO2 0.3-0.5%, Al2O3 0.3-0.5%, H3BO3 0.3-0.2%, BiO3 0.3-0.2%, Co3O4 0.3-0.5%, La2O3 0.3-0.5%, which is advantaged that density of the material, residural magnetic induction strength Br, coecive force Hcb and self-coecive force of the material are increased, conglobation of particles is reduced and the orientation degree is increased and density and orientation degree of raw blanks are increased by a method of automatic slurry injection and orientation of high magnetic field and suppression in the same direction.
Owner:陈赟
Remote NMR/MRI detection of laser polarized gases
InactiveUS7061237B2Improve signal-to-noise ratioHigh spin densityDispersion deliveryMeasurements using NMR spectroscopySpectroscopyPulse sequence
An apparatus and method for remote NMR / MRI spectroscopy having an encoding coil with a sample chamber, a supply of signal carriers, preferably hyperpolarized xenon and a detector allowing the spatial and temporal separation of signal preparation and signal detection steps. This separation allows the physical conditions and methods of the encoding and detection steps to be optimized independently. The encoding of the carrier molecules may take place in a high or a low magnetic field and conventional NMR pulse sequences can be split between encoding and detection steps. In one embodiment, the detector is a high magnetic field NMR apparatus. In another embodiment, the detector is a superconducting quantum interference device. A further embodiment uses optical detection of Rb—Xe spin exchange. Another embodiment uses an optical magnetometer using non-linear Faraday rotation. Concentration of the signal carriers in the detector can greatly improve the signal to noise ratio.
Owner:RGT UNIV OF CALIFORNIA
Pulsed high magnetic field auxiliary laser welding method and device
ActiveCN103769746AImprove fatigue strengthSmall structural deformationLaser beam welding apparatusStructural deformationStress concentration
The invention discloses a pulsed high magnetic field auxiliary laser welding method and device. The method and device can be applied to laser spot welding and seam welding. According to the method, in the overall welding process, laser beams are emitted to a workpiece to form a welding connector, a high pulsed magnetic field is exerted to the welding connector which is just solidified and the surrounding area, the pulsed magnetic field generates pressure stress on the surface of the workpiece to enable the connector area to have plastic deformation, residual stress is released to lower the degree of stress concentration and the degree of structural deformation of the welding connector, and the fatigue strength of the welding connector is improved. The device comprises a laser, a pulsed magnetic field generator, a numerical control system, an optical transmission system and a laser pulsed magnetic field composite processing head. The processing head is used for integrating the laser beams and the high pulsed magnetic field, and regulating the perpendicular distance between an electromagnetic conversion device and the surface of the workpiece and the horizontal distance between the electromagnetic conversion device and the laser beams. By means of the pulsed high magnetic field auxiliary laser welding method and device, structural deformation can be lowered, welding quality and processing efficiency are improved, and the processing effect which is superior to that of an existing laser welding process is achieved.
Owner:武汉飞能达激光技术有限公司
Compact self-tuned electrical resonator for buried object locator applications
ActiveUS20070018649A1Lower equivalent series resistanceHigh currentDetection of traffic movementResonatorsCapacitanceElectrical conductor
A self-tuning resonator for use in a transmitter apparatus for inducing alternating currents in a buried conductor. The resonator is dynamically tuned at frequencies below 500 kHz by exploiting the inherent voltage-variability of net capacitance in multilayer ceramic capacitors. The transmitter apparatus provides improved efficiency and induced output power suitable for use in a man-portable locator system, providing a very high magnetic field output from a physically small battery-powered resonator at frequencies under 500 kHz. The resonator exhibits a very low equivalent series resistance (ESR) and is adaptively retuned to a predetermined resonant frequency responsive to any changes in resonance arising from phenomena such as component heating, thereby supporting very high tank circuit currents from battery-powered source to produce very high magnetic flux output.
Owner:SEEK TECH
Method and apparatus for obtaining electrocardiogram (ECG) signals
Embodiments of the subject invention relate to a method and apparatus for obtaining an electrocardiogram (ECG) signal. Embodiments can separate a true ECG signal from one or more signals due to electric fields caused by moving electrical charges. In a specific embodiment, an ECG signal can be separated from one or more electric fields caused by blood flow. An embodiment pertains to a joint MRI and diagnostic ECG system. In an embodiment, the joint diagnostic quality ECG can add information to a MRI cardiac study. This additional information can be useful for MR guided intervention treatments, such as locating tissue that created bad electrical arrhythmia. In an embodiment, the subject method and apparatus can be utilized to obtain an ECG for patient located in a magnetic field of 1.5 T or higher, such as in MRI systems with 1.5 T or higher magnetic fields. Embodiments of the invention can use flow encoding with a changing magnetic field, with dense electrical sensors and inversion of the EEG data, utilizing this information to extract the flow related signals. Further, inversion to the source distribution of the flow related signals can be accomplished.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Information sensing and storing device and fabrication method thereof
ActiveCN104134748ARealize the detection functionRealize the storage functionMagnetic-field-controlled resistorsGalvano-magnetic device manufacture/treatmentSputteringMetallic electrode
An information sensing and storing device has a dual-MTJ (Magnetic Tunnel Junction) structure, and comprises a bottom electrode, an MTJ 1, a non-ferromagnetic metal isolation layer, an MTJ 2 and a top electrode sequentially from bottom to top, wherein a metal wire is arranged at one side of the device. A fabrication method of the information sensing and storing device comprises the five steps of: 1, depositing a magnetic multi-layer film material on a substrate; 2, performing annealing through an ultrahigh magnetic field vacuum annealing apparatus to fix the magnetization direction of a reference layer; 3, finishing shape fabrication of the dual-MTJ structure by using traditional nanometer device processing technologies such as photoetching, etching and magnetron sputtering; 4, depositing an isolation layer at the outer side of the dual-MTJ structure, and configuring the metal wire near the dual-MTJ structure through the technologies such as photoetching, etching and inlaying; and 5, forming a metal electrode at the top of the dual-MTJ structure by using the processing technologies such as photoetching, etching and inlaying for subsequent integration or test.
Owner:BEIHANG UNIV
Magnetic field-adjustable low-power Hall thruster with magnetic shielding effect
ActiveCN107165794AReduce corrosionExtend your lifeMachines/enginesUsing plasmaElectricityMagnetic shield
The invention discloses a magnetic field-adjustable low-power Hall thruster with a magnetic shielding effect, and belongs to the technical field of electric propulsion. Along with diversification of spaceflight task demands, more attention is paid to the low-power Hall thruster; but low power of the Hall thruster causes the problems of short life and low efficiency; and the problems are related to the geometric size of a discharge channel of the Hall thruster, the magnetic field configuration and strength and the like. The magnetic shielding theory is introduced in the design of the low-power Hall thruster; a permanent magnet is used for generating a high magnetic field; a double-magnetic-screen structure is used for forming a magnetic shielding magnetic field in the discharge channel to limit the plasma movement, so that the wall surface corrosion is weakened, and the life is prolonged; meanwhile, the power consumption of the Hall thruster is greatly reduced through use of the permanent magnet, and is not higher than 100 W; and in addition, the invention further designs a heat conduction structure in the thruster for preventing influence on the performance of the permanent magnet due to too high thermal load.
Owner:BEIHANG UNIV
Magnetic field and electrical current visualization system
InactiveUS6934068B2Improve imaging effectLarge spacingNon-linear opticsFilm researchSuperconductor classification
Magnetic field and / or electrical current imaging systems utilizing magneto-optical indicator films (MOIF) based on magneto-optical material with in-plane single easy axis type of magnetic anisotropy provide improved magnetic field resolution and dynamic range with the use of specific illumination conditions. Methods that provide the two-dimensional distribution of the external magnetic field vectors are disclosed together with the methods of extraction of said information. The visualizing systems offer high spatial resolution and / or high magnetic field resolution combined with fast sampling rates and the capability of performing large-area imaging. The applications of such systems include nondestructive testing and damage assessment in metal structures via magnetic materials or induced currents, integrated circuit testing and quality control, general magnetic material and thin film research, permanent magnet quality control, superconductor research and many others.
Owner:LAKE SHORE CRYOTRONICS INC
Design method for magnetic resonance imaging superconducting magnet system
ActiveCN102707250AImprove design efficiencyReduce dosageMeasurements using magnetic resonanceGlobal optimizationMaterials science
The invention relates to a design method for a magnetic resonance imaging superconducting magnet system. According to the design method, linear programming and non-linear optimization algorithms are combined, global optimization is performed in space where a coil is to be arranged to search the best position of the coil, and shapes and magnetic field uniformity of imaging areas, limiting ranges and intensity of stray magnetic fields, electric current security margins and the highest magnetic field intensity in the coil can be restrained. The designed coil has the advantages of being low in cost, simple in structure and the like.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
Alpha-Olefin-Based Polymer Composition, Molded Product Formed From the Composition, and Novel Polymer
ActiveUS20070225431A1Excellently balanced in flexibilityExcellently balanced in rubber elasticityRubber elasticityHeat resistance
A composition having excellent transparency, flexibility, rubber elasticity, thermal resistance, impact resistance, abrasion resistance and the like, a composition having excellent rigidity and impact resistance as well as excellently balanced in whitening resistance, abrasion resistance and heat sealability, and a composition having excellent rubbery properties, thermal resistance, abrasion resistance and flexibility are provided. A composition comprising a specific propylene•α-olefin copolymer for which, in a signal chart measured by 13C-NMR and predetermined such that the peak present at the highest magnetic field among the signals originating from CH (methine) of the constituent unit derived from an α-olefin having 4 to 20 carbon atoms is to be at 34.4 ppm, an absorption intensity A at about 22.0 to 20.9 ppm and an absorption intensity B at about 19.0 to 20.6 ppm satisfy the following relational expressions (i) and (ii) with respect to an absorption intensity C at about 19.0 to 22.0 ppm, which is assignable to propylene methyl: (A / C)×100≦8 (i), and (B / C)×100≧60 (ii), a molded product thereof, and the α-olefin-based copolymer are provided.
Owner:MITSUI CHEM INC
Magnet for head extremity imaging
ActiveUS10718833B2Minimize net forceMagnetic measurementsSuperconducting magnets/coilsWhole bodySuperconducting Coils
A magnetic resonance imaging (MRI) system uses a superconducting magnet having a primary coil structure and a shielding coil layer. The primary coil structure comprises at least three sets of coils with significantly different inner diameters, forming a three-bore magnet structure. The three bores are coaxially aligned with a longitudinal axis, with the largest diameter first bore on one side of the magnet and the smallest diameter third bore on another side of the magnet, as well as a medium diameter second bore located axially between the first and the third bores. The first bore allows access for the head and shoulders and permits the head to enter into the second bore for imaging, while the patient's extremities (hands, legs) may access through the third bore for producing images of the extremity joints. The magnet may also be used for other specialist imaging where use of a whole-body MRI is unwarranted, such as the imaging of neonates. Reinforcing plates can be connected between coil formers to withstand the forces generated by the high magnetic fields.
Owner:MAGNETICA
Use of ultra-high magnetic fields in resputter and plasma etching
ActiveUS7897516B1Enhance layeringEfficient resputteringElectric discharge tubesDecorative surface effectsPlasma densityUltra high density
Methods for resputtering and plasma etching include an operation of generating an ultra-high density plasma using an ultra-high magnetic field. For example, a plasma density of at least about 1013 electrons / cm3 is achieved by confining a plasma using a magnetic field of at least about 1 Tesla. The ultra-high density plasma is used to create a high flux of low energy ions at the wafer surface. The formed high density low energy plasma can be used to sputter etch a diffusion barrier or a seed layer material in the presence of an exposed low-k dielectric layer. For example, a diffusion barrier material can be etched with a high etch rate to deposition rate (E / D) ratio (e.g., with E / D>2) without substantially damaging an exposed dielectric layer. Resputtering and plasma etching can be performed, for example, in iPVD and in plasma pre-clean tools, equipped with magnets configured for confining a plasma.
Owner:NOVELLUS SYSTEMS
Magnetic resistance Z-axis gradient sensor chip
ActiveCN103995240ASmall sizeReduce power consumptionMagnetic field measurement using flux-gate principleMagnetic field measurement using galvano-magnetic devicesMagnetic field gradientElectrical resistance and conductance
Owner:MULTIDIMENSION TECH CO LTD
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