173 results about "High magnetic field strength" patented technology

Embodiments in accordance with the present invention provide a perpendicular recording magnetic head whose dimensional dependency on the nonuniformity of magnetic field strength and distribution during manufacture is minimized, with narrowed tracks and without attenuation or erasure of adjacent track data while maintaining high magnetic field strength. According to one embodiment, a magnetic material (trailing / side shield) for creating a steep gradient of magnetic field strength is provided at a trailing side of a pole tip of a main magnetic pole piece and in a direction of the track width. The magnetic head is formed so that a gap (side gap length “gl”) between a side shield and a throat height portion of the pole tip progressively decreases with an increasing distance from an air-bearing surface, in a direction of an element height. That is, side gap length “gl” (2) at an element height position P2 is made smaller than side gap length “gl” (1) at an air-bearing surface position P1 so as to satisfy a relationship of gl(1)>gl(2).

The present invention relates to an apparatus and a method for generating and changing a magnetic field in a field of view (28), said magnetic field having a, in particular ball-shaped or line-shaped, first sub-zone (62) having a low magnetic field strength and a second sub-zone (64) having a higher magnetic field strength. The proposed apparatus comprises at least three pairs of first coils (136a-136d), wherein the coils are arranged along a ring around the field of view and wherein the two coils of each pair are opposingly arranged on opposite sides of the field of view, at least one pair of second coils (116) opposingly arranged on opposite sides of the field of view at the open sides of said ring, generator means (110, 130) for generating current signals for provision to said first and second coils for generating the desired magnetic fields by said first and second coils, and control means (150) for controlling said generator means.

An improved magnetic torque transducer involves a method and apparatus for compensating effects of uniform and / or non-uniform magnetic sources by placing three sets of magnetic field sensors around a shaft with at least one magnetized zone. The set of primary magnetic field sensor or sensors is placed proximate to the magnetized zone, both the second and third sets of secondary magnetic field sensors being placed by pre-determined distances to the primary set of magnetic field sensor or sensors, so that primary field sensors always in a position with higher magnetic field strength arise from applied torque than that of secondary sensors. And a method is developed to use the second and third signals from secondary sensors to adjust the primary signal to compensating for the effects of the uniform and / or non-uniform ambient magnetic field sources.

A magnetic torque transducer arrangement for self-compensating effects of external magnetic sources and temperature offset includes a shaft with at least one magnetized zone, at least one active magnetic field sensor and at least one passive magnetic field sensor disposed in such a way that the active field sensor is always in a position with higher magnetic field strength arising from applied torque than that of the passive sensor. Passive field sensors may also be placed on both sides of the active field sensor, or on only one side of the active field sensor. The transducer output is obtained by subtracting the output of the passive field sensors from that of the active field sensor, thus canceling out the effect of the interfering magnetic field flux and temperature offset on the torque transducer, and partially filtering out the temperature sensitivity drift and rotational dependant signal.

An improved magnetic torque transducer arrangement for self-compensating effects of external magnetic sources and temperature offset comprises a shaft with at least one magnetized zone, at least one active magnetic field sensor and at least one passive magnetic field sensor disposed in such a way that active field sensor always in a position with higher magnetic field strength arise from applied torque than that of passive sensor. Passive field sensors may also be placed in both sides of the active field sensor, or on one side of active field sensor only. The transducer output is obtained by subtract the output of passive field sensors from that of active field sensor thus cancel out the effect of interfering magnetic field flux and temperature offset on the torque transducer, and partially filter out temperature sensitivity drift and rotational dependant signal. The sensitivity of active and passive field sensors can also be electrically matched by calibrating them in a uniform magnetic field, thus a completely common mode rejection can be achieved. The sensor arrangements may also be utilized in other type of sensors that extract changes in magnetic fields to indirectly detect direction, speed, presence, force, linear position, or angle to cancel out interfering magnetic field and temperature offset effect.

The invention discloses a magnetic liquid sealing device with a self-cleaning function, which belongs to the technical field of mechanical engineering sealing and comprises a shell (2), a left bearing (3), a left pole shoe (5) with a rubber seal ring, a permanent magnet (6), a right pole shoe (8) with a rubber seal ring, a right bearing (10), an adjusting gasket (11), a flange disk (13) and a shaft (14). The right end face of the right pole shoe and an axle line form an angle alpha of 10 to 80 degrees to change the shape of the right pole shoe and the magnetic field strength, so that the magnetic field strength on the side a of the right pole shoe is higher than that on the side b. According to Bernoullis equation, the pressure of the granules entering a magnetic liquid from outside on the side with high magnetic field strength is higher that on the side with low magnetic field strength, namely the pressure on the side a is more than that on the side b. The system generates a repulsive force to outside foreign materials so as to fulfil the aim of self cleaning.

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.

Dual mode energy harvesting methods and portable devices that use a combination spring-type piezoelectric and electromagnetic transducer contained in a hollow casing or housing with first and second insulated, coil-shaped wire springs coated with a conductive surface electrode and piezoelectric material separated and connected at opposing ends by a movable proof mass comprising a high magnetic field strength rare earth magnet that to generate harvest energy from human motion, including walking jogging, running, and jumping, to charge external devices that include, for example, cellphones, smartphones, fitness bands, electronic readers, tablet computers, digital cameras, smart eyewear, and wearable cameras.

The invention discloses a first-stage pullable binary coaxial current lead structure, and relates to a binary current lead technology. The structure comprises a first-stage current lead connected with a high-temperature part, a second-stage current lead connected with a low-temperature part and a pullable heat exchanger which is connected with the first-stage current lead and the second-stage current lead respectively and is positioned between the first-stage current lead and the second-stage current lead. The first-stage pullable binary coaxial current lead structure has the advantages of compact structure, stable performance, reliable operation, low heat leakage and convenience in disassembly and assembly, has the capacity of reducing heat leakage in an entire excitation process and subsequent normal operation, and is particularly suitable for a superconducting magnet with conduction cooling, less liquid helium and high magnetic field strength and operating in a closed loop.

A method and system for detecting iron using magnetic resonance imaging (MRI) is provided. The method comprises generating a substantially high magnetic field strength within the MRI system, acquiring magnetic resonance (MR) images by a pulse sequence adapted to create a magnetic field map of the brain for use in enhancing brain iron deposits, and, characterizing regions of interest using the magnetic field map to detect statistically relevant quantities of brain iron deposits to indicate a given disease.

A first magnet (6) and a second magnet (7) arranged so that the opposite poles thereof face one another are provided in a wall surface of a hollow section (2) through which paper currency (5) is transported, and thereby form a gradient magnetic field including a zero point both in a magnetic field component in the direction in which the poles face one another between the magnets, and in a magnetic field component in the direction of transport of the paper currency (5) within the hollow section (2). An AMR element (10) is provided between the paper currency (5) and the first magnet (6). The AMR element (10) is enclosed in a multilayer substrate and is clad with a resin. The AMR element (10) is provided in a region of low magnetic field strength near where the magnetic field strength of the gradient magnetic field reaches the zero point in the transport direction. The paper currency (5) passes through a region of high magnetic field strength in the gradient magnetic field.

The present invention relates to an apparatus and a method for influencing and / or detecting magnetic particles in a field of view. To increase the field of view and, at the same time, allow access to the patient during imaging, the apparatus comprises two or more transmit coil sets (200) wherein neighboring coil sets are partially overlapping, a transmit coil set comprising: a pair (210) of concentrically arranged selection field coils (211, 212) for generating a magnetic selection field (50) having a pattern in space of its magnetic field strength such that a first sub-zone (52) having a low magnetic field strength and a second sub-zone (54) having a higher magnetic field strength are formed in the field of view (28), and at least one pair (220, 230) of drive field coils (221, 222; 231, 232) for changing the position in space of the two sub-zones (52, 54) in the field of view (28) by means of a magnetic drive field so that the magnetization of the magnetic particles changes locally, said at least one pair (220, 230) of drive field coils being arranged parallel to said pair (210) of selection field coils (211, 212) and being formed by two neighboring coil loops.

The present invention relates to a method for spatial resolution determination of mechanical, physical, chemical and / or biological properties or state variables in a detection area of ​​a detection object, and / or mechanical, chemical and / or biological properties or state variables in the detection area. The method includes the following steps: a) introducing magnetic particles into the detection area; b) generating a magnetic field, which includes a first magnetic field with a low magnetic field intensity. subdomain and a second subdomain with a higher magnetic field strength; c) generating a superimposed oscillating or rotating magnetic field in the first subdomain, causing at least some of these magnetic particles to oscillate or rotate; d) detecting the irradiating the area with electromagnetic radiation; and e) detecting the reflected and / or scattered electromagnetic radiation and determining the intensity, absorptivity and / or polarizability. The invention also relates to a device for implementing the method. The invention further relates to an optical contrast composition and a magnetic particle composition having improved imaging properties.

The invention relates to a method of determining a spatial distribution of magnetic particles in an examination zone, in which a magnetic field is generated that has a first sub-zone of lower magnetic field strength and a second sub-zone of higher magnetic field strength. The positions of the two sub-zones are changed, as a result of which the magnetization in the examination zone changes. Measured values that depend on the change in magnetization are acquired. A reference response function by means of which measured values can be determined mathematically from a spatial distribution of magnetic particles is then determined by means of at least extensive magnetic specimen distribution. Finally, the spatial distribution of magnetic particles is reconstructed from the measured values by means of the reference response function.

An integrated multi yoke and loudspeaker system incorporating the yoke for providing a path for the magnetic field of each driver, resulting in higher magnetic field strength and thus a higher sound pressure level. The loudspeaker incorporating the yoke takes a smaller loudspeaker enclosure volume and has a wider sound dispersion. The yoke is configured to provide a common partition for all the drivers to which it is connected.

The invention discloses a refrigerator. The refrigerator comprises a box body, a sterilizing box for containing food, a magnetic field generator and a sterilizing chamber door body; a refrigeration chamber, a sterilizing chamber and a compressor bin provided with a compressor are defined in the box body; the sterilizing box is arranged in the sterilizing chamber and is provided with an opening. The magnetic field generator is arranged on the sterilizing box to form a magnetic field in the sterilizing chamber. The sterilizing chamber door body is arranged on the box body or the sterilizing box to open or close the opening. According to the refrigerator, food storage is not influenced, and the magnetic field generator is placed in the sterilizing chamber to generate the magnetic field for sterilization, so the magnetic field intensity is convenient to improve, the magnetic field distribution is uniform, the omnibearing sterilization without a dead corner is realized, and the sterilization efficiency of the magnetic field for food is improved. In addition, harmful chemical substances are not used in the refrigerator, and the food safety is ensured. The refrigerator has the dual functions of sterilization and refrigeration, so the deadline of the fresh keeping quality of food is greatly prolonged, and the practicability of the refrigerator is improved.

The invention relates to a composite magnet (1), which consists of a neodymium iron boron magnet (2) and other magnets (4) in a self-absorption way; thermal insulating layers are arranged between the neodymium iron boron magnet (2) and other magnets; the composite magnet (1) has stable magnetic property, high temperature resistance and high magnetic field strength, and has the application advantages after combination that a plurality of superposed magnetic fields can be generated, density of line of magnetic force is high, and the power stroke is long, therefore, the high magnetic energy can be utilized to a greater degree and in wider range of fields, thus achieving the purposes of utilizing the high magnetic energy, saving energy and protecting the environment. The devices or equipments manufactured by utilizing the composite magnet (1) are widely applied and particularly can be applied at high temperature.

The invention discloses a rotating magnetic field generator, comprising a bracket, wherein a motor is arranged on the bracket; a lower turntable is arranged on an output shaft of the motor; even number of permanent magnets are arranged on the lower turntable, and the magnetic poles of the adjacent permanent magnets far away from one end of the lower turntable are opposite; an upper turntable is arranged above the permanent magnets; a rotating shaft is arranged on the upper turntable and is arranged on the bracket; driven permanent magnets with the same number as the permanent magnets of the lower turntable are arranged on the lower surface of the upper turntable, and the permanent magnets correspond to the driven permanent magnets in the vertical direction; the magnetic poles of the driven permanent magnets on the upper turntable far away from one end of the upper turntable are opposite to the magnetic poles of the corresponding permanent magnets of the lower turntable far away from one end of the lower turntable in the vertical direction; and distances between the permanent magnets on the lower turntable and the driven permanent magnets on the upper turntable can be regulated. By utilizing the invention, the attenuation speed of the magnetic field can be decreased, and the strength of the magnetic field is enhanced.

The present invention relates to an apparatus and a method for generating and changing a magnetic field in a field of view (28), said magnetic field having a, in particular ball-shaped or line-shaped, first sub-zone (62) having a low magnetic field strength and a second sub-zone (64) having a higher magnetic field strength. The proposed apparatus comprises at least three pairs of first coils (136a-136d), wherein the coils are arranged along a ring around the field of view and wherein the two coils of each pair are opposingly arranged on opposite sides of the field of view, at least one pair of second coils (116) opposingly arranged on opposite sides of the field of view at the open sides of said ring, generator means (110, 130) for generating current signals for provision to said first and second coils for generating the desired magnetic fields by said first and second coils, and control means (150) for controlling said generator means.

The present invention relates to an apparatus for moving a target element which comprises a magnetic material and an active agent, through an object, placing the target element at a predetermined position within the object and activating the active agent. The apparatus comprises: a selection unit comprising a selection field signal generator unit and selection field elements, such as selection field magnets or coils, for generating a magnetic selection field having a pattern in space of its magnetic field strength such that a first sub-zone having a low magnetic field strength and a second sub-zone having a higher magnetic field strength are formed in a field of view, a drive unit comprising a drive field signal generator unit and drive field coils for changing the position in space of the two sub-zones in the field of view (28) by a magnetic drive field unit so that the magnetization of the magnetic material changes locally, and a control unit for controlling the signal generator units to generate and provide control currents to the respective field coils to generate appropriate magnetic fields for moving the target element through the object in a direction instructed by movement commands, for placing the target element at the desired position within the object and for activating the active agent when the target element has reached the desired position.

The invention discloses a spiral-capillary-based magnetic cell sorting apparatus and method, comprising four steps: S1, feeding a sample; S2, separating in a stationary manner; S3, washing at low flow speed; S4, collecting at high flow speed. A spiral capillary placed in the center of a circular magnet is used such that all cell and magnetic bead turbid liquids are near a tube wall of the circular magnet. As the tube wall of the circular magnet has highest magnetic field strength, it is possible to make full use of a magnetic field, improve sorting efficiency and reduce sorting time by using the apparatus. After step S4 is over, the spiral capillary is fully filled with a buffer solution, it is possible to continuously carry out the step S1 of sample feeding and start a next sorting procedure such that cells are continuously sorted; the invention is applicable to sorting of a large quantity of cells.

The invention discloses a high-magnetic-field-intensity pipeline deironing device capable of cleaning automatically, belonging to deironing devices. The deironing device is characterized by mainly consisting of a box body, a magnetic body device, a pneumatic device and an electrically control device; the box body is of a rectangle; a feed inlet pipe arranged above, a discharge pipe arranged below and a deironing pipe are welded on an upper side panel and a lower side panel of the box body; an inner baffle plate is welded at the right side of the feed pipe and the discharge pipe in the inner cavity of the box body; axial mounting holes are arranged in rows symmetrically on a left end panel, a right end panel and the inner baffle plate of the box body; magnet devices composed of sleeve pipes and magnetic bars penetrate in each axial mounting hole on a coaxial central line; a feed blocking ring is welded on a middle section of each sleeve pipe; the left end and the right end of each sleeve pipe are connected with a pneumatic device which is composed of an air compressor, a left two-position five-way pneumatic electromagnetic valve and a right two-position five-way pneumatic electromagnetic valve; and compressed air is induced in each sleeve pipe to drive the magnetic bar to move left to right to absorb iron and perform deironing. The pipeline deironing device has high magnetic field strength, good deironing effect and long service life.

The invention discloses a strong magnetic film medium, which has a laminated structure consisting of a buffer layer, a permanent magnetic film and a protective layer on a substrate material. A preparation method comprises the following steps of: firstly, preparing a clean and dry Si substrate, and growing and preparing the buffer layer on the surface of the substrate; secondly, preparing the permanent magnetic film and the protective layer with geometrical shapes in turn on the buffer layer by adopting a mask growth method or a growth ablation method under a vacuum condition; and finally, magnetizing the film medium by using a magnetizer. The application of the technical scheme of the invention reduces the size of a permanent magnetic material to micron magnitude; and the film medium generating a large magnetic field has the advantages of small volume, high magnetic field strength, good magnetic field directivity, simple design, high reliability and the like. In addition, the method for preparing the film medium has the advantages of simple process and broader application field.

The invention relates to a method and a system for depositing indium tin oxide at a low temperature. The method comprises the following steps of placing a base material into a vacuum film-coating chamber in which an indium tin oxide target material is provided; installing a cooling and vapor-removing device at the periphery of the indium tin oxide target; carrying out vapor-removal treatment on the base material by the cooling and vapor-removing device to remove vapor and impurity gases; controlling surface magnetic field strength of the indium tin oxide target material to be within a range of 600-900 gausses, carrying out film-coating in the presence of a working gas at a temperature of 100 DEG C, and forming an indium tin oxide film on the base material. The system comprises a vacuum film-coating chamber, an indium tin oxide target material, a base material supporting device, a cooling and vapor-removing device and a magnetic field device. The method and the system disclosed by the invention can be carried out at a low temperature, the cooling and vapor-removing device is used for refrigerating to capture vapor and impurity gases, purify and deposit an atmosphere and improve film-coating quality, and magnetic field strength is improved to obtain an indium tin oxide crystal with high quality and low resistivity.

The invention relates to a novel magnetic linger plate of a ball mill, comprising: a substrate, a wear-resistant linger plate, composite magnetic pole groups and a binding material. The wear-resistantlinger plate is arranged on the inner wall of the substrate, a hollow cavity is arranged in the wear-resistant linger plate, the composite magnetic pole groups are bound in the hollow cavity of the wear-resistant linger plate by the binding material, the composite magnetic pole groups are arrayed in same polarity along the axial direction of a ball mill cylinder and alternatively arrayed in N-pole and S-pole along the circumferential direction of the ball mill cylinder, the wear-resistant linger plate is cast by special ZG80Mn15Cr4, the composite magnetic pole groups are formed by high-performance ferrite materials and high-performance alloy magnet steel, the binding material is made from a novel material of America Fushilan. The novel magnetic linger plate has the advantages of rationally structural design, relatively high magnetic field strength and long service life; therefore, the novel magnetic linger plate can be widely used in ball mills.

The present invention relates to an arrangement (10) for influencing and / or detecting magnetic particles (100) in a region of action (300), which comprises selection means (210) for generating a magnetic selection field (211) having a pattern in space of its magnetic field strength such that a first sub-zone (301) having a low magnetic field strength and a second sub-zone (302) having a higher magnetic field strength are formed in the region of action (300). The arrangement further comprises drive means (220) for changing the position in space of the two sub-zones (301, 302) in the region of action (300) by means of a magnetic drive field (221) so that the magnetization of the magnetic material changes locally. The arrangement further comprises receiving means (230) for acquiring detection signals, which detection signals depend on the magnetization in the region of action (300), which magnetization is influenced by the change in the position in space of the first and second sub-zone (301, 302). Control means (76) are further introduced for controlling the selection means (210) to individually set the gradient strength of at least one of the static magnetic gradient fields (211) in a desired direction.

Embodiments in accordance with the present invention provide a perpendicular recording magnetic head whose dimensional dependency on the nonuniformity of magnetic field strength and distribution during manufacture is minimized, with narrowed tracks and without attenuation or erasure of adjacent track data while maintaining high magnetic field strength. According to one embodiment, a magnetic material (trailing / side shield) for creating a steep gradient of magnetic field strength is provided at a trailing side of a pole tip of a main magnetic pole piece and in a direction of the track width. The magnetic head is formed so that a gap (side gap length “gl”) between a side shield and a throat height portion of the pole tip progressively decreases with an increasing distance from an air-bearing surface, in a direction of an element height. That is, side gap length “gl” (2) at an element height position P2 is made smaller than side gap length “gl” (1) at an air-bearing surface position P1 so as to satisfy a relationship of gl(1)>gl(2).

The present invention relates to an apparatus and a method for influencing and / or detecting magnetic particles in a field of view. To increase the field of view and, at the same time, allow access to the patient during imaging, the apparatus comprises two or more transmit coil sets (200) wherein neighboring coil sets are partially overlapping, a transmit coil set comprising: a pair (210) of concentrically arranged selection field coils (211, 212) for generating a magnetic selection field (50) having a pattern in space of its magnetic field strength such that a first sub-zone (52) having a low magnetic field strength and a second sub-zone (54) having a higher magnetic field strength are formed in the field of view (28), and at least one pair (220, 230) of drive field coils (221, 222; 231, 232) for changing the position in space of the two sub-zones (52, 54) in the field of view (28) by means of a magnetic drive field so that the magnetization of the magnetic particles changes locally, said at least one pair (220, 230) of drive field coils being arranged parallel to said pair (210) of selection field coils (211, 212) and being formed by two neighboring coil loops.

To increase safety in the event of access to a total system 1; 32 in particular a medical system, with a field 3.1; 33.1 of high magnetic field intensity, a subsystem 5-12; 22-26, in particular with a light barrier 6 and / or a metal detector 5 and / or a door contact 25, is provided as the means for detecting access. According to one embodiment of the invention, the field line pattern and / or the intensity of the magnetic field is graphically represented by means of a luminescent display field 24 located on the floor, in particular made of photodiodes 31.

A magnetic material, and a MEMS device using the magnetic material A magnetic material comprises 50-80 wt % of Cobalt, 9-15 wt % of Nickel, 10-25 wt % of Rhenium, 0.1 to 2.0 wt % of Phosphorus, and 5-10 wt % of Tungsten or Platinum. It can be formed as a layer having good vertical magnetic properties (e.g. when magnetised it can provide a high magnetic field strength in the direction perpendicular to the plane of the layer). The layer preferably has a thickness of above 1 μm. It can be formed by electroplating. The layer is useful for inclusion in a MEMS device.