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1870 results about "Electromagnetism" patented technology
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Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles. The electromagnetic force is carried by electromagnetic fields composed of electric fields and magnetic fields, and it is responsible for electromagnetic radiation such as light. It is one of the four fundamental interactions (commonly called forces) in nature, together with the strong interaction, the weak interaction, and gravitation. At high energy the weak force and electromagnetic force are unified as a single electroweak force.
Two-Stage Delivery Systems and Methods for Fixing a Leadless Implant to Tissue
Systems and methods of delivering and retaining a leadless medical implant to tissue, wherein a docking base and the implant are sequentially delivered to an implantation site. In a first stage, the docking base is delivered and deployed into tissue at an implantation site. In a second stage, the implant is navigated through the vasculature and coupled to the docking base. Various mechanisms for navigating the implant to the previously implanted docking base and coupling the implant thereto are described. Navigational mechanisms include advancing the implant over a proximally extending wire portion that is releasably attached to the previously implanted docking base, utilizing fluoroscopic visualization to guide the implant to a previously implanted docking base that is at least partially radiopaque and utilizing electromagnetism to guide the implant to a previously implanted docking base that is electro-magnetizable.
Owner:MEDTRONIC VASCULAR INC
Two-Stage Delivery Systems and Methods for Fixing a Leadless Implant to Tissue
InactiveUS20110270339A1Transvascular endocardial electrodesExternal electrodesMedicineImplantation Site
Systems and methods of delivering and retaining a leadless medical implant to tissue, wherein a docking base and the implant are sequentially delivered to an implantation site. In a first stage, the docking base is delivered and deployed into tissue at an implantation site. In a second stage, the implant is navigated through the vasculature and coupled to the docking base. Various mechanisms for navigating the implant to the previously implanted docking base and coupling the implant thereto are described. Navigational mechanisms include advancing the implant over a proximally extending wire portion that is releasably attached to the previously implanted docking base, utilizing fluoroscopic visualization to guide the implant to a previously implanted docking base that is at least partially radiopaque and utilizing electromagnetism to guide the implant to a previously implanted docking base that is electro-magnetizable.
Owner:MEDTRONIC VASCULAR INC
Grease color acid value integral automatic detection device and method based on computer vision
InactiveCN101149367AImprove accuracyImprove reliabilityMaterial analysis by observing effect on chemical indicatorColor/spectral properties measurementsEngineeringBottle
Oil color and luster acid value integrated automatism detection instrument and its method based on computer visual, it relates to the oil detection field. It solves the disadvantage that not integrated, big error, not automatism in the exist technology. The CCD numeral camera links with the PC, the PC outputs the signal to the control instrument and the locale technology parameter adjustment control groupware separately, the control end of the control instrument links with the controlled end of the execute setup, the light source, CCD numeral camera and the sample bottle which is set in the electromagnetism beater are set in the same axes and set in the illumination box. The steps are: firstly, start up and set the parameter; value whether detect the acid value, if it detects, collects the oil sample and add in reagent, then titrates liquid collects the image to value whether reach the end point, if it does not, titrates again, if it reaches, stop titrating and calculates the acid value, detects twice and calculates its average value and output; if it is not, detects the color and luster, compares the standard image data and the collection image data twice, and output the data. This invention based on equipment, its error is small, and the veracity and reliability is high.
Owner:HARBIN UNIV OF COMMERCE
Nanometer level three-dimension magnetic resonance molecule imaging device based on diamond NV-color center
InactiveCN105738845ADecreased fluorescence intensityMeasurements using NMR imaging systemsMicrowaveColour centre
The invention discloses a diamond-based NV ‑ A nanoscale three-dimensional magnetic resonance molecular imaging device for color centers, comprising: a glass base; a laser, arranged inside the glass base, for emitting laser light to the outside; containing NV ‑ The diamond with the color center is arranged on the upper surface of the glass base, and the laser emitted by the laser is directly irradiated to the diamond; the microwave pulser is used to input microwave pulses to the diamond; the microscope objective lens is used to make the NV of the diamond ‑ Fluorescence from the color center is emitted outward through the microscope objective; a monochromatic filter for filtering the NV of the diamond ‑ Fluorescence from color centers; nanoconvex lenses that filter the NV of the diamond ‑ The fluorescence emitted by the color center is further concentrated; the distributed optical imaging lens is used to realize the imaging function; the packaging device is used to realize the functions of stable temperature, electromagnetic shielding and isolation protection.
Owner:HARBIN MEDICAL UNIVERSITY
Process for manufacturing high gain dual-linear polarization or dual-circle polarization waveguide array antennas
ActiveCN101083359AFix compatibility issuesResolve mutual interferencePolarised antenna unit combinationsResonant cavityManufacturing technology
The invention publishes a wave guide array antennas manufacture method of high gain crewel polarized or the double circular polarized, which relates to a wave guide array antennas manufacture technique in the correspondence broadcast and measure-control domain. The invention has designed the radiation level, the horizontal polarization or the circular polarization feed wave guide level, the perpendicular polarization feed wave guide level, the perpendicular polarization feed wave guide lap, the feed way of using the square or the circular waveguide resonant cavity, has solved the receive and launch of the double polarized electromagnetism signal; The horizontal polarization uses the coupling feed way and the perpendicular polarization uses the direct feed way, completes the separation of the two polarized components, simultaneously may realizes the double circular polarized work. The invention has the double polarized radiation, the high feed efficiency, compact structure, low processing cost and so on merits, is specially suitable for the manufacture of each kind of satellite communication or single control station antenna which works in the double thread polarization or double circular polarized application situations.
Owner:NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
Method for monitoring sleeve circumferential strain by using optical fibre grating sensor
InactiveCN101397903AGuaranteed stabilityOvercoming the limitations of susceptibility to electromagnetic interferenceSurveyUsing optical meansGratingEngineering
The invention relates to a method for monitoring the circumferential strain of a casing by applying optical-fiber grating sensors, which mainly solves the problem that an electric-resistance strain gauge adopted of the current technology for monitoring the circumferential deformation of the casing is easy to be affected by electromagnetism in a well and corrosion, thus causing a measured circumferential strain signal of the casing to be inaccurate. The method is characterized in that: the optical-fiber grating sensors are arranged outside the casing along the circumferential direction of the casing, wherein, a plurality of optical-fiber grating sensors are evenly arranged around the casing; sections of adjacent intervals form a certain angle; an optical-fiber temperature compensating sensor is arranged in a position at a corresponding distance away from the group of sensors; the optical-fiber grating sensors are applied to monitoring the circumferential deformation and stress status of the casing within certain ranges; meanwhile, the temperature compensating sensor is applied to serving the temperature compensation and temperature monitoring in the well of the strain sensor; the sensors transmit underground signals to the ground by a transmission optical cable; and the signals can be transformed into the circumferential strain information of the casing after a demodulation instrument obtains the signals and carries out secondary treatment. The method is characterized by not being affected by the underground electromagnetism.
Owner:DAQING OILFIELD CO LTD
Method for realizing minisize camera automatic focusing and minisize camera thereof
InactiveCN101064779ALow costReduce structural design requirementsTelevision system detailsColor television detailsCamera lensControl signal
A method to realize auto focusing of micro camera and a micro camera are disclosed, and the camera includes enclosure, lens mounted before the enclosure, sensor which includes imaging sensitimeter and phase detecting unit mounted in the enclosure, controller which is used to calculate the adjusting distance and direction according to the detecting signal from sensor, the focusing buffer pool which can align the sensitizing surface and focusing surface of sensor automatically, the focusing buffer pool is location adjusting mechanism driven by electromagnetism, the movable end is connected with sensor, and the other end is mounted on the rear of enclosure, when it receives the control signal for adjusting location and direction output by controller, and drives the movable end to move, and drives the sensitizing surface move to the location of focusing surface of sensor. The invention driven by electromagnetism reduces the difficulty of phone structure and manufacturing technique, and reduces the manufacturing cost, which benefits for the promotion and popularity of photograph camera with auto focusing function.
Owner:ZTE CORP
Suspension method for controling module of electromagnetism type magnetic suspension train in normal conduction and low temperature
InactiveCN1915704AAvoid interactionOvercome inherent flaws that existElectric propulsionMagnetic tension forceElectricity
A module levitation control method for the frequently conducting electromagnetic-type low-speed magnetic levitation train features that a levitation control system has only one levitation controller consisting of signal processing unit, A / D converter, clock signal generator, master DSP unit, PWM wave generator and auxiliary DSP unit. Said method includes such steps as measuring the levitation states of ends A and B of a module by two levitation sensors, calculating their control values, and controlling the current values of electromagnets A and B and in turn their electromagnetic forces, so ensuring the gap between module and track to be constant.
Owner:NAT UNIV OF DEFENSE TECH
Minitype composite vibration power generator
InactiveCN102185523AWide operating frequency rangeIncrease power generation capacityPiezoelectric/electrostriction/magnetostriction machinesDynamo-electric machinesVibration-powered generatorMicro power source
The invention discloses a minitype composite vibration power generator belonging to the field of minitype power technology and energy-saving technology. The minitype composite vibration power generator is a cantilever beam vibration power generator compounded by piezoelectricity and electromagnetism and mainly comprises an insulating shell, a piezoelectric cantilever beam, a permanent magnet and an inductance coil, wherein the piezoelectric cantilever beam consists of a piezoelectric sheet and a supporting substrate; the piezoelectric sheet is bonded on the supporting substrate; one end of the supporting substrate is fixed on the insulating shell; the permanent magnet is bonded with a free end of the piezoelectric cantilever beam; and an inductance coil is arranged right above the permanent magnet. Under the resonant state, the power generator synchronously outputs the piezoelectric current and the electromagnetic current; the output power is improved within the finite volume; furthermore, by adopting the structure of dispersing mass blocks, the energy collecting density is improved, and the working frequency scope is enlarged simultaneously.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
DC electric motor/generator with enhanced permanent magnet flux densities
ActiveUS20130249343A1Reduces and eliminates undesired effect and lossMagnetic circuit rotating partsSynchronous machinesMagnetic tension forceEngineering
This disclosure relates in general to a new and improved electric motor / generator, and in particular to an improved system and method for producing rotary motion from a electro-magnetic motor or generating electrical power from a rotary motion input by concentrating magnetic forces due to electromagnetism or geometric configurations.
Owner:LINEAR LABS
Touch screen, manufacturing method and display device
ActiveCN103092446AMeet market demandInput/output processes for data processingCapacitanceDisplay device
The invention provides a touch screen, a manufacturing method and a display device, and relates to the technical field of touch technology. Working at the same time or working independently of original chirography electromagnetism handwriting and capacitance touch can be achieved. The market requirements of lightness and thinness can be met when the touch screen is used for the display device. The touch screen comprises a base plate, a plurality of first capacitance touch electrodes which are parallel with each other and are arranged on the same side of the base plate, a plurality of first electromagnetism touch electrodes which are parallel with the first capacitance touch electrodes, a plurality of capacitance touch electrodes which are crossed with the first capacitance touch electrodes and are parallel with each other, a plurality of second electromagnetism touch electrodes which are crossed with the first electromagnetism touch electrodes and are parallel with each other, and a protective layer arranged on the uppermost side. Different electrodes are not in electric connection with each other. The touch screen, the manufacturing method and the display device are used for manufacturing electronic equipment with a touch function.
Owner:BEIJING BOE OPTOELECTRONCIS TECH CO LTD
Mixed coupling coaxial cavity filter capable of controlling electromagnetism
The invention discloses a controllable electromagnetic mixed coupling coaxial cavity filter, comprising a conductor housing with two or more resonant cavities opened inside, the top of which is sealed by a conductor cover board and which is provided with a through hole; an input / output device penetrates through the through hole on the conductor hosing; bottoms of two or more conductor resonators are fixed to the conductor housing in contact with the guide housing to form short circuit; the conductor cover board opposite to the tope of the conductor resonator is provided with a tuning screw; an electromagnetic mixed coupling control component is arranged between two adjacent guide resonators which need electromagnetic mixed coupling. The invention accomplishes elliptic filter characteristic with a coaxial cavity filter only with main coupling path, which is provided with the following advantage of small volume, low cost, little insertion loss and nonsymmetrical response.
Owner:SOUTH CHINA UNIV OF TECH
Nuclear magnetic resonance and transient electromagnetic combined instrument and method
InactiveCN1936621AImprove signal-to-noise ratioOvercoming the small emission currentElectric/magnetic detection for well-loggingMeasurements using NMR imaging systemsSolid-state nuclear magnetic resonanceNMR - Nuclear magnetic resonance
The invention discloses a geophysical exploration device and the method which combines the nuclear magnetic resonance and the transient electromagnetism. First to select the coupled device in the transient electromagnetism mode, and it lays the emission loop and the receiving loop to detect every measuring point in the detecting section and treat the transient electromagnetism data to find the low electrical resistivity point; then it changes to the nuclear magnetic resonance mode and lays the emission loop using the demarcated abnormal detecting point as the center, so it compares the detected data or the figure with the resistivity detected by the transient electromagnetism to judge the true or false of the detected resistivity. The invention can decrease the device cost and improve the detecting efficient and the precision.
Owner:JILIN UNIV
Temperature and humidity regulable set for parallel type heat pump
InactiveCN1546913AEasy to controlMeet the requirements of large-scale changes in cooling and heating loadsCompression machines with several evaporatorsAir conditioning systemsAir volumeFrost
The invention is a kind of parallel heat pump temperature and humidity adjusting unit, which belongs to cooling, air conditioning and humidity eliminating technology field. The invention has a compressor, outdoor heat exchanger, the first and the second indoor heat exchanger and the restriction device, all of which are connected into a cooling circle through the cooling agent pipe, the outdoor heat exchanger and the second indoor exchanger are paralleled, the unit also includes a four-way valve. The invention can realize four kinds of different running mode through the four-way valve, and realizes quick frost eliminating without stop. The invention can satisfy the demands of large change of cold and hot load, and it can carries on micro adjustment through the on / off of the two electromagnetism valves on the two paralleled heat exchanger branches and adjusting the wind quantity and the water quantity in outdoor heat exchanger. The invention upgrades the utilization ratio of the device.
Owner:TSINGHUA UNIV +1
Modular multilevel converter (MMC) topology converter efficient electromagnetism transient state simulation method
ActiveCN103116665AReduce interface callsImprove Simulation EfficiencySpecial data processing applicationsTransient stateComputer Aided Design
The invention discloses a modular multilevel converter (MMC) topology converter efficient electromagnetism transient state simulation method. The method comprises the following steps: (1) building a thevenin equivalent circuit of a submodule and acquiring the hevenin equivalent circuit of a series subnodule, (2) opening power system computer aided design (PSCAD) and operating Fortran script editing user-defined module, (3) replacing at least one submodule by using the user-defined module, (4) using status bit to show insulated gate bipolar transistor (IGBT) status in the user-defined module of the PSCAD, (5) and figuring submodule capacitor voltage and submodule current by using a difference equation. The method reduces the number of nodes of a MMC topology converter model, and is quick in simulation speed and high in efficiency.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
Data-driven design method integrating active interlayer microstrip antenna structure and electromagnetism and antenna
ActiveCN103353904ATo overcome the difficulty in realizing the design of electromechanical integrationRealize the structureSpecial data processing applicationsInformation technology support systemEngineeringRadio frequency
The invention discloses a data-driven design method integrating an active interlayer microstrip antenna structure and electromagnetism and an antenna, and solves the problem that the prior art can not realize the integrated design of the structure and electromagnetism. The method comprises the following steps: firstly, fixing the material, size, panel and cellular size of a radio frequency function layer according to electrical property indexes, secondly, obtaining front deformation data and stress data of the antenna structure through mechanical analysis, thirdly, preprocessing the front deformation data, so as to obtain the position error of each radiating element, fourthly, calculating a far-field pattern of an interlayer microstrip antenna according to a data-driven coupling model, fifthly, calculating and considering the wave-transparent performance influenced by the panel and cellular, sixthly, establishing an optimization design model integrating the interlayer microstrip antenna structure and electromagnetism, and seventhly, solving the optimization design model, so as to obtain an optimal integrating result. The method can realize the simultaneous optimal design of the active interlayer microstrip antenna structure and electromagnetism, shortens the development period, and improves force-electricity properties of products.
Owner:XIDIAN UNIV
Electrical switch
InactiveUS20070126538A1More practicalSave energyProtective switch detailsCircuit-breaking switches for excess currentsEngineeringConductor Coil
An electrical switch for connecting and breaking a circuit including a connecting and breaking mechanism for connecting and breaking the circuit provided with at least a set of movable contacts and stationary contacts; a electromagnetism drive mechanism for controlling the contacts to be actuated so as to realize closed circuit; a housing for accommodating the movable contact and stationary contact; an arc-extinguishing mechanism disposed in the housing and corresponded to the movable and stationary contact; a case connected to a base for accommodating the electromagnetism drive mechanism; a bedplate associated with the case; and a holding mechanism disposed on the bedplate for holding the contacts to connect the circuit, the electromagnetic holding mechanism is electromagnetic and has a set of electromagnetic attracting mechanism in which the movable iron core is made to be a pothook or a baffle mechanism, the movable iron core is attracted so that the pothook or baffle keeps the switch closed by means of hitching or ramming the movable bolt when the electromagnetic attracting mechanism is powered on. The electrical switch has a structure in which it has a breakaway mechanism using winding, in which the remanence being small and the feedback force being large and the action of the limiting current being rapid, it can break the large short current as air switch.
Owner:LIU PING
Electromagnetic protection film with efficient shielding and electromagnetism absorption function
ActiveCN103619154AAnti-jammingPlay a protective effectMagnetic/electric field screeningMetal layered productsMobile phoneElectromagnetism
Provided is electromagnetic protection film with the efficient shielding and electromagnetism absorption function. According to the electromagnetic protection film with the efficient shielding and electromagnetism absorption function, a release layer is arranged on the surface of a base material, a barrier insulating layer is arranged on the surface of the release layer, at least one metal layer is arranged on the surface of the barrier insulating layer, and at least one conductive electromagnetism absorption layer is arranged on the surface of the metal layer. The electromagnetic protection film with the efficient shielding and electromagnetism absorption function has the excellent capacity of shielding and reflecting an electromagnetic wave signal, can effectively absorb transmitted electromagnetic wave signals, can carry out comprehensive electromagnetism protection, and can be widely applied to portions, such as FPCs and hard PCBs, of mobile phones, cameras, medical apparatuses and instruments, notebook computers and the like, wherein the FPCs, the hard PCBs and the like need electromagnetism protection.
Owner:BAODING LUCKY INNOVATIVE MATERIALS
Device and method for full-automatically sorting circulating tumor cells on micro-fluidic chip
ActiveCN104140926AEasy accessReduce volumeBioreactor/fermenter combinationsBiological substance pretreatmentsMain channelEngineering
The invention discloses a device and method for full-automatically sorting circulating tumor cells on a micro-fluidic chip. The device mainly comprises the PDMS micro-fluidic chip and an electromagnetism microvalve structure. The PDMS micro-fluidic chip comprises liquid storage holes (A, B, C, D, E and F), a detecting channel, a main channel, a first focusing channel, a second focusing channel, a sample outlet channel, a target cell collecting channel and an electromagnetic sorting channel. When the circulating tumor cells pass through the detecting channel, produced voltage signals are detected and sent to an NI collecting card and a processing terminal, the processing terminal sends out a voltage signal through the NI collecting card so that an electromagnetic relay can be switched off, the electromagnetic microvalve structure presses a PDMS layer below the electromagnetic microvalve structure, the PDMS layer deforms, a part of liquid is drained out of the liquid storage hole E, and the circulating tumor cells are pushed to flow to the target cell collecting channel. According to the device, the embedded type electromagnetic microvalve structure is used for providing driving force for sorting, electroosmosis driving and electroosmosis focusing are adopted on samples, and the circulating tumor cells can be detected and sorted in a full automatic mode.
Owner:THE SECOND HOSPITAL OF DALIAN MEDICAL UNIV +1
Method for measuring dielectric properties of diamond anvil cells in situ
InactiveCN103076501AGuaranteed shapeGuaranteed fixed effectResistance/reactance/impedenceElectromagnetismMaterials science
The invention discloses a method for measuring dielectric properties of diamond anvil cells in situ and belongs to the technical field of electromagnetic measurement under high voltage. The method comprises the following steps of firstly, assembling the diamond anvil cells, i.e. respectively forming round electrodes on the anvil surfaces of two diamond anvil cells, wherein an insulating layer is arranged on the inner side wall of a sample cavity of a composite insulating cushion; secondly, performing measurement, i.e. using a frequency response analysis meter to obtain relation patterns between an impedance real part and an impedance virtual part under different pressures; and finally, performing data processing, i.e. using Zview software and an electromagnetic metering formula related to dielectric properties to obtain the relative dielectric constant epsilon r, the dielectric constant real part epsilon', the dielectric constant virtual part epsilon'', the loss tan theta and the like. The shapes and the positions of the electrodes are fixed, and meanwhile, correction is performed because of the influence of fringe effect on a measuring result; and the prepared composite insulating cushion ensures complete insulation of the inner wall of a voltage cavity, so that the method for precisely measuring the dielectric properties of a material in situ under high voltage is realized.
Owner:JILIN UNIV
Method for measuring non-contact type bearing startup friction torque and measuring instrument thereof
InactiveCN101303261ASolve the problem of starting friction torqueAutomatic monitoring of starting and running statusWork measurementTorque measurementAir bearingFriction torque
An apparatus for measuring non contact type bearing start friction torque, is composed mainly of a loading cylinder (1), a force transducer (2), a loading housing (3), an air main shaft (5), an air bearing (6), a torque generator (7), a disk drive (8), an optoelectric transducer (9), an electrical system. The torque generator generates induction electromagnetic torque as drive torque, the optoelectric transducer monitors bearing start running state automatically; when being measured, the measured bearing is installed on the air main shaft, the disk drive is linked with the air main shaft and placed in the torque generator, the electrical system applies input power to the torque generator step by step after throwing axial load, when the induction electromagnetism drives the air main shaft to rotate through the disk drive, the optoelectric transducer matching-installed by the disk drive monitors the measured bearing from static state to start running state, and outputs signal to stop applying input power, and records current power value which is the start friction torque value of the measured bearing.
Owner:LUOYANG BEARING SCI & TECH CO LTD
Radial-tangential permanent magnet and electromagnetism mixed excitation generator
InactiveCN102647067AStable output voltageLow failure rateMagnetic circuit rotating partsMagnetic circuit stationary partsPermanent magnet rotorConductor Coil
The invention provides a radial-tangential permanent magnet and electromagnetism mixed excitation generator, belonging to the technical field of an electrical appliance of a motor of an automobile. The excitation generator consists of rotors, a stator, a front end cover, a rear end cover and a rectifier, wherein the permanent magnet rotor and the brushless electrically-excited rotor are arranged on a shaft and commonly adopt one armature winding, a generated magnetic field is formed through combination in a parallel connection form in an air gap of the generator, and the size of the magnetic field formed by combining a permanent magnetic field and an electrically-excited magnetic field in the air gap of the generator is changed through regulating the size and the direction of the current passing the electrically-excited rotor, so as to ensure that the generator can output the direct current with stable voltage under the conditions of variable rotation speed and variable loads, thereby supplying electrical energy for electric equipment of the automobile.
Owner:SHANDONG UNIV OF TECH
Towrope type ocean controllable source electromagnetism and earthquake data collection system
InactiveCN104280781AImprove reliabilityIncrease the amount of data collectedSeismic signal receiversElectric/magnetic detectionElectric field sensorAccelerometer
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Electronic apparatus with hidden antenna
ActiveCN101483270AImprove sturdinessSave hardware spaceAntenna supports/mountingsAntenna equipments with additional functionsEngineeringWavelength
The invention discloses an electric device with a hidden antenna comprising a metal frame, a substrate, an upper casing and a lower casing, wherein the upper casing, the metal frame and the lower casing form a cavity to store the substrate. The lower surface of the metal frame has a groove, wherein the hemline of the groove has a feed-in end, and both sides of the groove form a first short circuit end and a second short circuit which electrically connects to a metal surface of the substrate. Thereby, the metal frame uses the first short circuit end and the second short circuit end and feed-inend to form a half wave cycle antenna. Thus the electric device can use the metal frame to receive and transmit an electromagnetism signal.
Owner:HTC CORP
Method for reinforcing water-bearing stratum of floor of coal seam and protecting water-bearing stratum during reinforcement
InactiveCN101608552AEasy to operateEasy constructionUnderground chambersTunnel liningEngineeringCement paste
The invention discloses a method for reinforcing a water-bearing stratum of a floor of a coal seam and protecting the water-bearing stratum during reinforcement, which comprises the following steps: 1) geophysical prospecting coalface by using transient electromagnetism, and exploring the position of the water-bearing stratum; 2) distributing reinforcement drill holes according to the geophysical prospecting result, wherein an angle alpha between the reinforcement drill holes and the horizontal plane is a high inclination-angle as possible; 3) slip-casting by using cement paste through the reinforcement drill holes; and 4) controlling the pressure of boreholes to less than twice that of L8 limestone hydraulic pressure. The method thoroughly avoids the passive situation that forced cessation of production of the coalface is caused by groundwater burst fatalness.
Owner:郭国政
Electromagnetism and magnetorheological fluid mixed shock absorber
InactiveCN102588497AAchieve vibration reductionReduce energy consumptionNon-rotating vibration suppressionSemi activeNitrogen
The invention discloses an electromagnetism and magnetorheological fluid mixed shock absorber which can realize active control, is low in energy consumption and can recover energy. The electromagnetism and magnetorheological fluid mixed shock absorber comprises an upper shell and a lower shell which are connected together; an intermediate connecting plate is arranged at the connecting part of the two shells; a piston rod penetrates into the two shells and is connected with a piston body after penetrating through the intermediate connecting plate; the upper shell and the piston body are internally provided with an electromagnetic device respectively; the two electromagnetic devices are both connected with a control unit, and the control unit is connected with a signal end of a sensor; the lower shell at the lower part of the piston body is internally provided with a moving piston; a magnetorheological fluid cavity is respectively arranged between the piston shell of the piston body and the intermediate connecting plate and between the piston shell of the piston body and the moving piston, and the two magnetorheological fluid cavities are communicated by a communicating structure of the piston body; and a nitrogen cavity is arranged between the moving piston and the lower shell. The electromagnetism and magnetorheological fluid mixed shock absorber combines the advantages and disadvantages of the magnetorheological fluid semi-active control and the magnetism active control of the shock absorber, and has the advantages of being good in shock absorbing effect, low in energy consumption and recoverable in energy.
Owner:SHANDONG UNIV
Master-slave cooperation non-contact satellite platform and control system and method thereof
InactiveCN105501466AHigh precisionImprove stabilityCosmonautic vehiclesAttitude controlAttitude controlClosed loop
The invention discloses a master-slave cooperation non-contact satellite platform, and a control system and method thereof; the satellite platform comprises a loading cabin, a service cabin, and a magnetic suspension mechanism; the bottom of the loading cabin is provided with a payload; the loading cabin is provided with a star sensor, a gyro and a payload control unit; the service cabin comprises general satellite modules, and is provided with a drive mechanism, a thruster, a momentum wheel, a solar battery array and a relative attitude control unit; the magnetic suspension mechanism comprises a permanent magnet end and a coil end; the permanent magnet end is fixedly connected with the loading cabin; the coil end is fixedly connected with the service cabin; the permanent magnet end and the coil end can use electromagnetism effect to generate electromagnetic force according to command needs; the control system is divided into independent and organically combined 3 closed loops; a sliding mode control method is employed so as to complete high precision high stability attitude control, and robustness is good; the control system and method can be applied to high resolution detection type high performance spacecrafts.
Owner:SHANGHAI SATELLITE ENG INST
Electrical switch
InactiveUS7623010B2Small sizeCompact structureCircuit-breaking switches for excess currentsProtective switch detailsConductor CoilElectromagnetism
Owner:LIU PING
Anti-electromagnetic interference multilayer composite material and method for producing the same
InactiveCN101175394ALow resistivityStrong electromagnetic shieldingMagnetic/electric field screeningScreening apparatusBasementElectromagnetic interference
The present invention provides an anti electromagnetic interference multilayer composite materials, which comprises a plastic basement and a metal layer loaded on the plastic basement. The metal layer comprises at least three layers which are a first metal layer, a second metal layer and a third metal layer in turn from inside to outside. The first metal layer and the third metal layer are all formed by one of stainless steel, chrome and nickel. The second metal layer is formed by one of argentums, cuprum and aluminum. The multilayer composite materials provided by the present invention has a small resistivity with a resistance less than two ohm in the largest distance in an area, strong electromagnetism shielding capacity (the electromagnetism shielding capacity reaches up to 10 to 50 Debye), strong corrosion resistance and good combining power to the plastic basement. Even under the effect of brine corrosion, the metal layer in particular to the second metal layer is still firmly attached to the plastic basement. In addition, the metals forming the metal layer of the present invention are all routine and not expensive metals, so the cost of production is relatively low.
Owner:BYD CO LTD
System and method for measuring unfrozen water content in frozen soil by pulse nuclear magnetic resonance (NMR)
InactiveCN102004115AImprove measurement efficiencyNo side effectsAnalysis using nuclear magnetic resonancePulse nuclear magnetic resonanceMagnetization
The invention relates to a system and a method for measuring unfrozen water content in frozen soil by pulse NMR, aiming at the problems that, in the measurement of unfrozen water content, measuring procedures are complex, operators need relatively high electromagnetism theoretical basis, and operations are difficult; a plurality of test pieces are needed under multi-temperature and multi-pressure working conditions, and the test pieces are exposed in normal temperature to influence measurement precision. The system is characterized in that a soil testing tube is disposed in a ceramic tube; a temperature signal input end of a temperature sensor is disposed in the soil testing tube; a temperature signal output end of the temperature sensor is connected to the temperature signal input end of a temperature control valve. The method is characterized in that different relaxation time of solid water, combined water and free water in attenuation process are stipulated when free attenuation signals of magnetization intensity are fitted, so that the magnetic field intensity value corresponding to the free attenuation signals of magnetization intensity during the relaxation time can be obtained. The system and method of the present invention measure the unfrozen water content in frozen soil.
Owner:HARBIN INST OF TECH
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