284 results about "Magnetic intensity" patented technology

An image forming apparatus includes a conveying pipe configured to convey a developer and a magnetic field generation mechanism configured to generate a magnetic field inside the conveying pipe to affect the developer. The magnet is formed to have lower magnetic intensities at positions upstream and downstream from a middle position of the conveying pipe along a conveying direction of the conveying pipe than a magnetic intensity in the middle of the conveying pipe.

A method and apparatus for determining a characteristic of an earth formation surrounding a borehole in which a pulsed nuclear magnetic resonance (NMR) tool is received. A static magnetic field is produced in the borehole using at least two spaced-apart magnets in the NMR tool. The static magnetic field has a first region of substantially uniform magnetic intensity at a first location in the borehole, the first location in the borehole having a first temperature. The NMR tool is moved to a second location in the borehole having a second temperature, and a static magnetic field having a second region of substantially uniform magnetic is produced. The at least two spaced-apart magnets are controllably moved relative to each other wherein the first region of substantially uniform magnetic intensity and the second region of substantially uniform magnetic intensity are substantially equal in size and distance from the NMR tool.

The invention discloses a target posture tracking method based on inertia and a geomagnetic sensor. According to the target posture tracking method, posture tracking can be realized without any reference marker and a specific tracking environment, and the method is simple and feasible; a gyroscope, an accelerometer and the geomagnetic sensor are used for respectively acquiring components of angular speeds, accelerated speeds and magnetic intensity data corresponding to a current posture of a target in three sensitive axes; a posture tracking result of the gyroscope is corrected by using the accelerometer and the geomagnetic sensor and drift errors are eliminated so that the precision of a tracking result is improved; and the target posture tracking method utilizes an efficient offline operated Kalman filtering algorithm and fuses a multi-sensor tracking result, so that the real-time online posture tracking is realized.

There is provided a quadrilateral insulating substrate, and plural magnetic sensors are provided on the substrate. An IC is provided on the substrate for supplying driving signals to the magnetic sensors and receiving magnetic detecting signals from the magnetic sensors to output magnetic information depending on strength of magnetism. The magnetic sensors and the IC are encapsulated by an encapsulation member to integrate the substrate and magnetic sensors and IC.

The invention relates to a magnetic device capable of performing facial beautifying and wrinkle removing on a human body and a beautifying method thereof. The magnetic device is composed of an AC filtering circuit, a rectifying and DC filtering circuit, a power factor adjusting and boosting circuit, a startup slow starting circuit, a high-voltage energy storage circuit, an energy-storage capacitor discharging circuit, a safety protection discharging circuit, an auxiliary power supply module, a computer control module and an adjustment display module. The beautifying method comprises the steps that a central part of an inductance coil is placed at the part which needs to be beautified, the inductance coil keeps a small distance away from the skin or is slightly contacted with the skin, or a piece of soft tissue paper is arranged between the inductance coil and the part to be beautified; the output frequency of the inductance coil is controlled to be between 30Hz and 300Hz by the computer control module; the output magnetic intensity of the inductance coil is controlled and adjusted by the computer control module so as to set the stimulation intensity which gives rise to contraction of subcutaneous muscles; the action time is set to be between 0.4s and 3.0s, the interval time is 1.0s-3.0s, the beautifying time is 15-30min for one time, beautifying is performed once a day, and 10 times form a course of treatment.

The invention relates to a novel process for preparing magnetic active carbon with a C-Fe shell-core structure by utilizing waste biomasses. The process overcomes the defects of complicated preparation process, high cost and high price of the traditional shell-core active carbon, and by utilizing the form change of the waste biomasses in the presence of heating, the processes of carbonization, activation, magnetism giving and protection of the biomasses are achieved in one step. The key of the process lies in selecting an appropriate activating agent, controlling an appropriate carbonizing and heating system and carbonizing atmosphere and ensuring that the active carbon completely coats iron in the production process. The obtained active carbon has high specific surface area, pore volume and magnetic intensity and the C-Fe shell-core structure. Proved by experiments, after the active carbon is soaked in a 2M salpeter solution for 2h, the magnetism cannot be lost, and a product can be used in a strongly acidic solution.

The invention discloses an indoor positioning method based on PDR and geomagnetism fusion. The method includes the following steps: establishing an indoor global geomagnetism reference image by indoor geomagnetism data acquired by a magnetometer; when a carrier moves in an indoor environment, respectively measuring the accelerated speed and the angular speed of the carrier and the absolute force of the position of the carrier through an acceleration sensor, a gyroscope and a magnetometer on the carrier, and calculating the heading and the step length of the carrier by a PDR algorithm; searching a local geomagnetism reference image from an indoor global geomagnetism reference image according to the position of the carrier at the previous time, the heading and the step length; and matching a magnetic vector obtained by real-time measurement of a magnetic field sensor on the carrier with the local geomagnetism reference image through a geomagnetism matching algorithm to obtain the position coordinates of the carrier to implement positioning. By the indoor positioning method based on PDR and geomagnetism fusion, shortcomings of pure geomagnetism positioning and PDR positioning are overcome, and the positioning precision is superior to 1 m; and therefore, the indoor positioning method based on PDR and geomagnetism fusion can be used for high-precision indoor positioning places.

A magnetic recording method is provided where ternary data is recorded on a magnetic recording medium by forming a first area that corresponds to a first value of the data and in which a first magnetization state is continued at least during the minimum write width. A second area that corresponds to a second value of the data in which a second magnetization state is oppositely magnetized as compared with the first magnetization state is continued at least during the minimum write width. A third area that corresponds to a third value of the data in which the magnetic intensity detected by the read head corresponds to a “0.” Accordingly, the ternary data can be recorded using the characteristic that a signal having a width narrower than the detection width of the read head is not detected by the read head.

The invention discloses a self-discharge detection method for lithium iron phosphate batteries, which relates to the technical field of screening of lithium batteries. The self-discharge detection method is characterized in that the batteries are fully charged, and placed in a uniform magnetic field with magnetic intensity ranging from 0.01T to 1.3T, self-discharge of the batteries is accelerated by the aid of an effect of the high-intensity magnetic field to the lithium iron phosphate batteries, the lithium iron phosphate batteries are taken out from the high-intensity magnetic field after standing in the high-intensity magnetic field for 1 day to 15 days, self-discharge rates of the shelved batteries are tested after the batteries are degaussed, and batteries with abnormal discharge properties can be selected according to actually measured data of self-discharge rates. The method is used for screening the self-discharge properties of the lithium batteries, disqualified batteries can be selected within a short period of time, and the method has an important popularization value.

The invention belongs to the technical fields of environmental protection and comprehensive utilization of resources, and particularly relates to a biomass liquefaction residue activation method for recycling a biomass hydrothermal liquefaction residue and application of the biomass liquefaction residue. The specific process comprises the following steps: (1) activating a biomass liquefaction residue with acid or alkali to generate activated carbon particles; (2) performing in-situ synthesis on the activated carbon particles to generate magnetic particles, wherein the magnetic carbon material has high specific surface area, high pore volume and high magnetic intensity, and can be magnetically separated from a water solution; and (3) removing organic dye pollutants in wastewater with the magnetic carbon material. The invention has important promotion action on development of the biomass industry. The preparation method has the advantages of low energy consumption, environment friendliness, mild conditions, simple process, high adsorption capacity for dye organic pollutants, no secondary pollution and the like.

The invention discloses a sound surface wave integrated magnetic sensor for a magnetic fluid with a back groove type structure, which comprises a piezoelectric substrate, two interdigital transducers (IDT), a magnetic fluid groove and two sets of antennae for receiving and transmitting magnetic wave signals; the two interdigital transducers (IDT) are positioned at two ends of the surface of the substrate respectively; the magnetic fluid groove is arranged in the middle of the bottom of the piezoelectric substrate between the two interdigital transducers; the antennae for receiving and transmitting the magnetic wave signals are connected to omnibus bars of the two IDTs respectively; the sensor can realize passive wireless high-precision real-time magnetic intensity measurement, and receive a radio frequency signal by the antennae, excite a Rayleigh wave (RSAW) on the IDTs; the zero lagging response of the magnetic fluid on the change of an outer magnetic field instantaneously makes the energy of the Rayleigh wave attenuated, converts the attenuated Rayleigh wave into a magnetic wave by the IDTs and transmits the magnetic wave by the antennae. According to the corresponding relation of the changes of the frequency and the amplitude of the transmitted magnetic wave and the magnetic filed intensity change, the magnetic filed change can be accurately measured.

A sputtering process and magnetron especially advantageous for low-pressure plasma sputtering or sustained self-sputtering, in which the magnetron has a reduced area but full target coverage. The magnetron includes an outer pole face surrounding an inner pole face with a gap therebetween. The outer pole of the magnetron of the invention is smaller than that of a circular magnetron similarly extending from the center to the periphery of the target and has a substantially larger total magnetic intensity. Thereby, sputtering at low pressure and high ionization fraction is enabled.

The invention relates to a preparation method of water-dispersible graphene/ferroferric oxide (Fe3O4) composite powder. The method comprises the following steps of: (1) ultrasonically dispersing graphite oxide and sodium polystyrene sulfonate into water at room temperature to form reaction liquid, raising a temperature to 90 to 110 DEG C, and reacting for 8 to 16 hours; (2) adding ferric salt and ferrous salt into the reaction liquid under the protection of nitrogen atmosphere at room temperature, adding ammonia water, reducing the temperature to 70 to 90 DEG C, reacting for 20 to 40 minutes, and then adding an oleic acid for continuous reaction; and (3) cooling to room temperature, collecting the graphene/Fe3O4 composite powder by using a magnet, washing and drying to obtain the finished product. The method is simple and easy for industrial production; Fe3O4 in the prepared composite powder has pure crystalline phase; the Fe3O4 is well combined with the graphene; the Fe3O4 has good dispersibility on a surface of the graphene and in a layer of the graphene; the composite powder is low in resistivity, high in magnetic intensity and good in underwater dispersibility and has a good application prospect.

The invention discloses a preparation method of super-hydrophobic magnetic nano-crystalline cellulose paper, relates to a preparation method of magnetic nano-crystalline cellulose paper, and aims to solve the technical problems of poor hydrophobic effect and no magnetism of nano paper prepared by an existing method. The method comprises the following steps: 1, preparation of nano-crystalline cellulose water liquid; 2, preparation of nano-crystalline cellulose-magnetic nanoparticle mixed liquor; 3, preparation of a hydrophobic substance; 4, suction filtration film-forming of magnetic nano-crystalline cellulose; 5, preparation of the super-hydrophobic magnetic nano-crystalline cellulose paper. The super-hydrophobic magnetic nano-crystalline cellulose paper prepared by the method has the characteristics that the hydrophobic contact angle can reach up to 150 degrees or more, the rolling angle is less than 10 degrees, the magnetic intensity can reach 60emu/g, the stretching stress can reach 90MPa, and the maximal pyrolysis temperature can reach 360 DEG C. The preparation method belongs to the field of nano-crystalline cellulose paper preparation.

The general field of the invention is that of gravimeters, of the matter-wave type, allowing the measurement of the gravitational field or of an acceleration in a given direction of measurement. This type of gravimeter uses ultracold atoms to take the measurement. It necessarily comprises an atom trap (5) making it possible to immobilize an ultracold atom cloud (10) in a determined configuration and means (7) for splitting-recombining the cloud into two atom packets placed at different heights so as to create a phase shift due to gravity. The device according to the invention combines both these functions on an atom chip (3) mainly comprising means for generating a local magnetic field minimum around a first conductor wire (30), a second conductor wire (31) and a third conductor wire (32) that are substantially parallel in the zone of the trap to the first conductor wire and are placed symmetrically on either side of this first wire, the second wire being traversed by a first alternating current, the third wire being traversed by a second alternating current of the same amplitude and of the same frequency as the first alternating current and in the opposite direction, the amplitudes of the first and of the second currents being able to vary simultaneously, the maximum amplitude and the frequency of said currents being sufficient to create at the atom cloud a magnetic field with an intensity greater than the magnetic intensity necessary to split the atom cloud into two atom packets.

The present invention provides a magnetic device for measuring scour depth. The magnetic device comprises a plurality of scour detecting units which are buried in the sediment and disposed at intervals along the direction perpendicular to the surface of water. Each scour detecting unit comprises: one or more magnetic sources; and one or more magnetic detecting elements configured to be apart from the magnetic source for a predetermined distance. The magnetic detecting element is utilized to detect the magnetic field generated by the magnetic source. The scour depth and the position where scour occurs are determined according to electronic signals corresponding to the magnetic strength detected by the respective magnetic detecting elements of the scour detecting units. The magnetic device of the present invention has many advantages including low cost, high efficiency, and such a device is easily deployed.

The invention relates to an angular displacement sensor, belonging to the technical field of magnetoelectric sensors. The sensor comprises a rotating member (1), wherein the rotating member (1) comprises a magnetic element (2) with magnetizing direction substantially parallel to the axial direction of the rotating member (1) thereof. The magnetic field generated by the rotating member (1) forms parallel and uniform magnetic field in the magnetic flux induction surface of a Hall sensor (4). When the rotating member (1) rotates, the increment of the magnetic intensity detected by the Hall sensor (4) is proportional to the angular increment in a wide angular region, so as to realize the measurement to the angular displacement. The inventive angular displacement sensor has the advantages of simple structure, low production cost, good signal stability, and highly linear and controllable signal conditioning.

The invention provides a microwave composite material which is compounded from nano magnets made of ferromagnetic materials and organic materials, wherein the nano magnets are distributed in the organic materials, the size of the nano magnets made of the ferromagnetic materials is greater than the room-temperature superparamagnetic critical dimension of the ferromagnetic materials, and the resistivity of the organic material is greater than 1 ohm. cm. The invention also correspondingly provides multiple methods for preparing the microwave composite material. The microwave composite material has the characteristics of high resistivity and high saturated magnetic intensity, has good flexibility and certain elasticity, and is beneficial to the miniaturization and portability of devices. Besides, the preparation process of the microwave composite material can be compatible with the conventional semiconductor process, and realizes the integral monolithic integrated circuit.

This invention relates to a fabricating method for anisotropically bonded magnet including: step S1 for adjusting the first mixture and the second mixture, where: the first mixture comprises the first magnetic powder, of which the grain size is in the range of 20-150mum, thermosetting resin of 2.0 wt%being added into the anisotropically bonded magnet, the first additive; the second mixture comprises the second magnetic powder, of which the grain size is in the range of 1-20mum, the second additive; step S2 for adjusting the first mixture and the second mixture; step S3 for making the magnetic intensity of the end part of the shaping metal die be under the 0.8T, the magnetic intensity of the central part of the shaping metal die is 5% higher than that of the said end part of the shaping metal die after said mixed compounds being filled into the metal die; step S4 for heating said mixed compounds at the atmosphere of inert gases or nitrogen gases so as to harden compounds.

A vibration-proof holder applicable to a communications/navigation device for vehicle use is provided, characterized by the use of a gap-detecting unit to detect position variations of the communications/navigation device, and an electromagnetic control unit to adjust magnetic intensity of magnetic bodies fixedly installed in the vehicle, wherein first and second magnetic bodies are limited to remain in the same track and to face one another with the same magnetic polar end thereof, such that the communications/navigation device can return to its initial position to achieve the vibration-proof effect.

The invention discloses a preparation method for magnetic lignin-based activated carbon. The method comprises the following specific steps: stirring lignin, a chemical activating agent and a magnetic additive with water into paste, and uniformly mixing; after drying, performing carbonization and activation at the temperature of 650-850 DEG C, and then quenching and cooling, wherein the activation time is 0.5-3 hours; washing by sequentially using diluted acid and water until the pH value is 6-8, drying, and finely grinding, so that the magnetic lignin-based activated carbon is obtained. According to the invention, the combination of a oriented preparation technology and a magnetic functionalization technology for the activated carbon can be realized through a simple and convenient one-step preparation process, the used activating agent is environment-friendly, and the obtained magnetic activated carbon is large in specific area and excellent in adsorptive property, and has sufficient magnetic intensity and magnetic stability.

The invention discloses (GeTe) a (Sb2Te3) b base dilute magnetic semiconductor material for storing information, which is characterized of doping (GeTe) a (Sb2Te3) b alloy, wherein the percentage composition of doping dose is larger than 0 and is less than 40%, doping element is one of magnetic iron, cobalt, nickel and manganese or rare earth element, or mixture thereof. Under the function of external energy, the invention can realize reversible material between crystalline state and amorphous state. The material can realize the change of resistance value from twice to several magnitude range before and after reversibility; simultaneously, the light reflectivity of the material is different before and after the reversibility; and the material has variable magnetisms before and after the reversibility or the material has a certain different magnetic intensity before and after the reversibility, when a magnetic detector scans, different magnetic signals recorded in the two different regions of amorphous phase and crystal phase can be detected or converted into an electric signal to be detected, are respectively expressed to be 0 and 1, and is applicable to phase change storage, light storage and magnetic storage.

The invention relates to a preparation method and magnetic activated carbon prepared by the same. According to the invention, waste biomass is used as a raw material to prepare the magnetic activated carbon, and the raw material is low in price and easily available, so that the production cost of the magnetic activated carbon is greatly lowered. The activated carbon is recycled so as to avoid secondary pollution, and the preparation method has important meaning on the elimination of secondary pollution. In addition, the magnetic activated carbon is prepared by one step by combining three processes including carbonization, activation and magnetization. The production process is simple and the cost is lowered. Furthermore, the magnetic activated carbon not only has the advantages of high specific surface area and good adsorptive property, but also has an adjustable pore structure and has enough magnetic intensity and stable magnetic property.