295 results about "Magnetic exchange" patented technology

A magnetic data track used in a magnetic shift register memory system may be fabricated by forming a multilayered stack of alternating dielectric and / or silicon layers. Vias of approximately 10 microns tall with a cross-section on the order of 100 nm×100 nm are etched in this multilayered stack of alternating layers. Vias may be etched form smooth or notched walls. Vias are filled by electroplating layers of alternating types of ferromagnetic or ferrimagnetic metals. The alternating ferromagnetic or ferrimagnetic layers are comprised of magnetic materials with different magnetization or magnetic exchange or magnetic anisotropies. These different magnetic characteristics allow the pinning of magnetic domain walls at the boundaries between these layers. Alternatively, vias are filled with a homogeneous ferromagnetic material. Magnetic domain walls are formed by the discontinuity in the ferromagnetic or ferromagnetic material that occurs at the notches or at the protuberances along the via walls.

A corrosion-resistant granular magnetic recording medium with improved recording performance comprises a non-magnetic substrate having a surface; and a layer stack on the substrate surface, including, in order from the surface: a granular magnetic recording layer; an intermediate magnetic de-coupling layer; and a corrosion preventing magnetic cap layer. The intermediate magnetic de-coupling layer has an optimal thickness and / or composition for: (1) promoting magnetic exchange de-coupling between the granular magnetic recording layer and the magnetic cap layer; and (2) reducing the dynamic closure field (Hcl) for determining writeability and eraseability of the medium. Grain boundaries of the magnetic cap layer are substantially oxide-free, and have a greater density and lower average porosity and surface roughness than those of the granular magnetic recording layer.

A magnetic data track used in a magnetic shift register memory system may be fabricated by forming a multilayered stack of alternating dielectric and / or silicon layers. Vias of approximately 10 microns tall with a cross-section on the order of 100 nm×100 nm are etched in this multilayered stack of alternating layers. Vias may be etched form smooth or notched walls. Vias are filled by electroplating layers of alternating types of ferromagnetic or ferrimagnetic metals. The alternating ferromagnetic or ferrimagnetic layers are comprised of magnetic materials with different magnetization or magnetic exchange or magnetic anisotropies. These different magnetic characteristics allow the pinning of magnetic domain walls at the boundaries between these layers. Alternatively, vias are filled with a homogeneous ferromagnetic material. Magnetic domain walls are formed by the discontinuity in the ferromagnetic or ferromagnetic material that occurs at the notches or at the protuberances along the via walls.

The invention relates to a winch heave compensation device for an ocean floating drilling platform. The device comprises an active compensator and a passive compensator which are arranged on one side of a winch in parallel. The active compensator comprises a first single-rod piston cylinder with a piston rod stretching upwards and a force transducer, wherein two chambers of the first single-rod piston cylinder are connected to a hydraulic system through a three-position four-way magnetic exchange valve, and the force transducer is used for detecting force on a steel wire rope and electrically connected with a force feedback controller which controls exchange actions of the three-position four-way magnetic exchange valve. The passive compensator comprises a second single-rod piston cylinder with a piston rod stretching upwards. Tops of the piston rods of the first piston cylinder and the second piston cylinder are connected onto a movable pulley, a fixed pulley is further arranged on the drilling platform, and the steel wire rope on the winch is connected with a crown block and a traveling block after bypassing the movable pulley and the fixed pulley sequentially. According to the device, the compensation effect that active compensation and passive compensation are mutually synchronous and promoted can be achieved.

The invention relates to a walking-type glass-curtain-wall cleaning robot. The walking-type glass-curtain-wall cleaning robot comprises four leg feet, four magnetic exchange valves, a power source, a direct current motor, a robot shell, a vacuum pump, dust removing cloth and a control system. The four leg feet are installed on the four corners of the robot shell; the four magnetic exchange valves are fixed to an assembling boss on the bottom face of the robot shell through screws and are next to the left wall and the right wall of the walls of the shell; the power source is installed in a power source clamping sleeve of the robot shell; the vacuum pump is fixed to the bottom face of the robot shell and next to the corresponding wall of the shell; the direct current motor is installed in a concave cylinder of the robot shell, and the dust removing cloth is installed at the bottom of the direct current motor. The walking-type glass-curtain-wall cleaning robot is large in flexibility and can surmount grooves and barriers, and particularly, the advantages are quite obvious when the cleaning robot is used for cleaning a push-pull-type window. When the robot performs cleaning, the direct current motor drives the dust removing cloth to rotate; as long as the robot walks through the positions needing to be cleaned, the dust removing cloth can achieve the effect that the positions needing to be cleaned are cleaned multiple times, and the efficiency is higher than that of manual cleaning performed with hands.

A perpendicular spin orbit torque (SOT) memory device includes an electrode having a spin orbit torque material, where the SOT material includes iridium and manganese and a perpendicular magnetic tunnel junction (pMTJ) device on a portion of the electrode. The pMTJ device includes a free magnet structure electrode, a fixed layer and a tunnel barrier between the free layer and the fixed layer and a SAF structure above the fixed layer. The Ir—Mn SOT material and the free magnet have an in-plane magnetic exchange bias.

The invention relates to a laser navigation system of an unmanned combine-harvester. The laser navigation system of the unmanned combine-harvester comprises a laser sensor, an angle sensor, a microprocessor, a general packet radio service (GPRS) module and an autosteerer. The laser sensor is installed on a support on the right side of a sickle of a combine-harvester, and is connected with the microprocessor through a bus; the angle sensor is installed on a support supporting the laser sensor, measures an angle of the rotation of the support, and is connected with the microprocessor through the bus; the GPRS module is directly connected with the microprocessor through the bus to conduct data exchange and communication; the autosteerer comprises a magnetic exchange valve, a full-hydraulic steering machine, a steering hydro-cylinder, and wheels, wherein the magnetic exchange valve and the full-hydraulic steering machine are connected with the microprocessor through the bus, the other end is connected with the steering hydro-cylinder, and the microprocessor is installed inside a cockpit of the combine-harvester. The laser navigation system of the unmanned combine-harvester achieves automation, intelligence and refinement of a crop harvesting field, reduces labor intensity, and improves harvesting efficiency of crops, operation accuracy and driving safety.

A magnetic field enhanced photovoltaic device includes a photoelectric conversion layer, a first electrode, a second electrode, a ferro-antiferromagnetic exchange coupling layer and an applied magnetic field. The first electrode and the second electrode are respectively disposed on two surfaces of the photoelectric conversion layer to collect electrons and holes generated by the photoelectric conversion layer. The first electrode is pervious to light. The incident light reaches the photoelectric conversion layer through the first electrode. The applied magnetic field polarizes the spin state of electrons. The ferro-antiferromagnetic exchange coupling layer adjoins the photoelectric conversion layer and pins the spin state of electrons.

The invention discloses an automatic quick leveling hydraulic control circuit of a down-the-hole drill and a control method of the automatic quick leveling hydraulic control circuit. The automatic quick leveling hydraulic control circuit comprises support oil cylinders, support balance valves, a magnetic exchange valve bank, a hydraulic control proportional directional valve, a load sensing variable displacement pump and a hydraulic oil tank. Magnetic exchange valves corresponding to the support oil cylinders in quantity are arranged in the magnetic exchange valve bank. Rod cavities and rodless cavities of the support oil cylinders are connected with oil ports of the magnetic exchange valves through the support balance valves. Oil inlets and oil outlets of the magnetic exchange valves are connected in parallel to serve as an oil port P and an oil port T of the magnetic exchange valve bank. An oil port A and an oil port B of the hydraulic control proportional directional valve are communicated with the oil port T and the oil port P of the magnetic exchange valve bank respectively. A pressure relay is communicated with an oil inlet of the magnetic exchange valve bank. A pilot oil pump is connected with a pilot control valve block. A control port of the pilot control valve block is communicated with a pilot cavity b of the hydraulic control proportional directional valve through an electric proportional pressure reducing valve. A pressure feedback port Ls of the load sensing variable displacement pump is communicated with the hydraulic control proportional directional valve. The load sensing variable displacement pump is connected with the hydraulic oil tank. According to the automatic quick leveling hydraulic control circuit of the down-the-hole drill and the control method of the automatic quick leveling hydraulic control circuit, a working platform of the drill can be quickly, accurately and stably leveled, so that operation difficulty is lowered, auxiliary operation time is shortened, and comprehensive drilling efficiency is enhanced.

The invention relates to a plastic inspection well comprehensive test detector and belongs to the field of product performance detection and test. The detector comprises a frame, a workbench I, an axial-radial loading hydraulic cylinder, a pressing plate, a guide rail I, a slide block, a shearing loading hydraulic cylinder, a pressing head connection support, a saddle-shaped pressing head, a horizontal mobile hydraulic cylinder, a hinging support, a stop block, a heavy punch, a guide rail II, a steel wire rope, a beam, an electromagnet, a lifting hydraulic cylinder, a water tank, a pressing block, a water pump, a motor, a two-position three way magnetic exchange valve and a pressure regulating and limiting valve. The detector can detect axial load, radial load, bellmouth shearing load, airtightness and weld strength of a plastic inspection well, lateral ring flexibility, rigidity and shock resistance, and pedal bearing performances, has a wide application range, realizes automatic control, automatic test, automatic recording and data storage, has the advantages of reliable operation and high test efficiency, realizes dead load test detection, has a simple structure and multiple functions and can be popularized easily.

The invention discloses a control device of a lifting mechanism of an industrial vehicle and a control method. The control device comprises an oil tank, a quantitative hydraulic pump, a motor for driving the quantitative hydraulic pump to rotate, an overflow valve communicated with an exit of the quantitative hydraulic pump, a one-way valve, a hydraulic oil cylinder, a magnetic exchange valve arranged between the one-way valve and the hydraulic oil cylinder, an electromagnetic proportional valve communicated with the exit of the hydraulic pump and in parallel connection with the magnetic exchange valve, a programmable logic controller for controlling on-off of the motor, opening and closing of the magnetic exchange valve and the aperture of an opening of the magnetic exchange valve, a proportional lifting button connected with the programmable logic controller and provided with an ascending button and a descending button, and a weighing system. The control device of the lifting mechanism of the industrial vehicle and the control method are capable of improving service life of the quantitative hydraulic pump and the motor and reducing energy consumption and impact, stable in operation, good in safety, precision in positioning and high in efficiency of the whole system.

The invention discloses a double-balanced oil cylinder transverse horizontal control device which comprises a rack, a left lifting arm, a left lifting oil cylinder, a left lifting pull rod, a lower left pull rod, a lower right pull rod, a right lifting pull rod, a right lifting arm, a right lifting oil cylinder, an upper pull rod, a first magnetic exchange valve, a second magnetic exchange valve, an angle transducer and an automatic horizontal controller. According to the double-balanced oil cylinder transverse horizontal control device, the two lifting arms are driven by the two lifting oil cylinders to rotate, due to the fact that the two lifting oil cylinders are adopted, a tractor suspension device can adopt hydraulic lifting oil cylinders with smaller cylinder diameter, and the manufacturing cost is reduced; meanwhile, the two lifting oil cylinders simultaneously control the horizontal state of a suspended farm implement, and the horizontal adjustment speed of the farm implement is higher.

The invention relates to a mountain cutting and rock drilling tunnel stone splitting machine, belongs to the technical field of stone splitting machines, and provides the mountain cutting and rock drilling tunnel stone splitting machine which solves the problems that field working is lack of electricity and power and is capable of achieving mechanical-electrical-hydraulic integration and saving manpower, high in efficiency, safe and environmentally friendly. The mountain cutting and rock drilling tunnel stone splitting machine comprises a chassis, a big arm, a small arm, a main machine body and a hydraulic system; the chassis, the big arm and the small arm are rotatably connected in sequence, and the small arm is connected with the main machine body through an angle adjusting device; the main machine body comprises three pushing oil cylinder sets, a gear case, a drill rod, a drill bit, splitting devices and a pushing slideway, the first pushing oil cylinder set is connected with the gear case through a universal coupling, the second pushing oil cylinder set and the third pushing oil cylinder set are each connected with the corresponding splitting device through a universal coupling, and the hydraulic system comprises a hydraulic motor, two overflow valves, six magnetic exchange valves, a high-pressure oil pump and a pressure meter. The mountain cutting and rock drilling tunnel stone splitting machine is mainly applied to the mountain cutting and rock drilling tunnel aspect.

The invention discloses a preparation method of biphase composite hard magnetic ferrite nano-powder with hard magnetic / soft magnetic exchange coupling, belonging to the technical field of preparation of magnetic ferrites. The method comprises the following steps: directly adding hydrochloric acid-cleaned SrFe12O19 ferrite nano-powder which is prepared by a hydrothermal method into a reaction kettle for preparing NixZn(1-x)Fe2O4 ferrite nano-powder by the hydrothermal method; directly preparing the nano composite ferrite powder at a low temperature, wherein the prepared biphase powder which is not sintered at a high temperature shows a single phase magnetic behavior, namely the powder has the exchange coupling effect. The preparation method disclosed by the invention is simple and applicable tofor preparing pure oxide biphase composite hard magnetic ferrite nano-powder with hard magnetic / soft magnetic exchange coupling.

The invention relates to a servo-control hydraulic excitation system for a high-speed rail track roadbed test. The technical scheme of the invention is as follows: the oil press port of an oil pump (11) is respectively communicated with the P port of a servo valve (4) and the P port of a first magnetic exchange valve (6) through a first check valve (8) and a first filter (7); the A port and B port of the servo valve (4) are respectively correspondingly communicated with two working oil ports (26,29) of a dynamic pressure cavity (38) of a twin-stage servo hydraulic cylinder (2); the A port of the first magnetic exchange valve (6) is communicated with the oil inlet of a second check valve (5), the oil outlet of the second check valve (5) is respectively communicated with a second working oil port (24) of a static pressure cavity (45) of the twin-stage servo hydraulic cylinder (2), the A port of an electromagnetic ball valve (16) and an accumulator (3); and the working end of the twin-stage servo hydraulic cylinder (2) is connected with an excitation disc (17), and a right end cap (30) of the twin-stage servo hydraulic cylinder (2) is connected with a hydraulic excavator used for test. The servo-control hydraulic excitation system provided by the invention has the advantages of good dynamic response, small hydraulic system flow and good simulation effect, and meets the requirements of high excitation frequency and high exciting force simultaneously.

The invention discloses a preparation method of a biphase composite hard magnetic ferrite with hard magnetic / soft magnetic exchange coupling, belonging to the technical field of preparation of magnetic ferrites. The method comprises the following steps: pressing acid-cleaned SrFe12O19 and NixZn1-xFe2O4 ferrite nanopowder independently prepared by a hydrothermal method into wafers according to a certain weight ratio; then, calcining the wafers for 2 hours at 700 DEG C, wherein the biphase ferrite externally shows a single phase magnetic behavior, namely an exchange coupling effect exists. With the adoption of the method, as the required ferrite phase is directly prepared at a low temperature by the hydrothermal method, the phase forming problem doesis not needed to be considered when the ferrite is sintered at a high temperature into blocks. The grains of the powder are fine and uniform, so that the ferrite can be sintered into compact blocks at a lower temperature, thereby facilitating reduction of sintering temperature and energy consumption of the blocks. The grain of the ferrite which is calcined for 2 hours at 700 DEG C is still about 20nm, thereby facilitating formation of the exchange coupling effect.

A magnetic recording medium having a composite magnetic recording structure comprising the combination of a hard magnetic layer and a metamagnetic layer that possesses a field induced metamagnetic transition characteristic at ambient operating temperature. Under an applied external magnetic field, the metamagnetic layer transitions from an antiferromagnetic state to a ferromagnetic state, and the magnetic field induces magnetization of the metamagnetic layer. The hard magnetic recording layer is magnetically exchange coupled to the magnetized metamagnetic layer. This results in the softening of the coercivity of the overall magnetic recording structure and reduction of the required switching field during data recording. Upon removal of the applied magnetic field, the metamagnetic layer experiences transition back to an antiferromagnetic state and the coercivity of the hard magnetic layer is restored. This restoration allows the written bit to be stored at a high thermostability ratio and thus, preventing magnetization thermal decay of the data bit.

A bit patterned magnetic recording medium, comprises a non-magnetic substrate having a surface; a plurality of spaced apart magnetic elements on the surface, each of the elements constituting a discrete magnetic domain or bit; and a layer of a ferromagnetic material for regulating magnetic exchange coupling between said magnetic elements. The layer has a saturation magnetization Ms ranging from about 1 to about 2,000 emu / cm3, preferably below about 400 emu / cm3, more preferably below about 200 emu / cm3, and may overlie, underlie, or at least partially fill spaces between adjacent magnetic elements.

A clutch hydraulic control system of a single-planet-row convergence hydraulic mechanical continuously variable transmission comprises a gear-shifting mechanism clutch control system, a planet-row clutch control system, a lubrication cooling system and an oil supply system. Control pressures required by the gear-shifting mechanism clutch control system, the planet-row clutch control system and the lubrication cooling system are sequentially decreased. The clutch hydraulic control system has the advantages that accurate pressure control, gentle pressure change and supplementation of a small amount of oil leakage are ensured by using a clutch energy accumulator; a synchronizing clutch behind a planet row is controlled by adopting a magnetic exchange valve, and the hydraulic control cost is reduced on the basis that gear shifting is basically stable; the intelligence degree of the system is improved and energy consumption is reduced by using a temperature sensor; an oil supply pump adopts a small-displacement high-pressure gear pump and meets the requirements for large clutch control oil way pressure and low required oil quantity; a large-displacement low-pressure gear pump is used for cooling and meets the requirements for low cooling lubrication oil way pressure and large oil quantity.

The invention relates to an integration hydraulic brake system of a wind generating set, comprising a main bearing brake cylinder, a yaw brake cylinder, a locking cylinder and an integration brake device, and all parts are mutually connected by pipelines provided with a stop valve, a manual exchange valve and a magnetic exchange valve with the function of manual operation, wherein a pressure switch I for alarming is arranged at an oil leaking port of the brake cylinder. The hydraulic brake system has the advantages of manual operation function, compact volume, simple structure and simple operation.

The invention relates to a hydraulic control system, aims to solve the problem that error operation is caused easily when a manual ball valve of an hydraulic control system of an existing extractor accessory is switched and provides a hydraulic control system of an extractor accessory. An accessory control valve is connected with a left pipe and a right pipe for being connected with an accessory; the electric control end of a first magnetic exchange valve is connected with a controller, an oil inlet is connected with a leading oil source, an oil return opening is connected with a hydraulic box, an oil outlet is connected with a liquid control end of a cutoff overflowing valve and a liquid control end of a two-position three-way reversing valve simultaneously, and the oil outlet is communicated with either the oil inlet or the oil return opening; an oil inlet of the cutoff overflowing valve is connected with the left pipe, and an oil outlet of the cutoff overflowing valve is connected with a hydraulic oil tank; an oil inlet and an oil outlet of the two-position three-way reversing valve are connected to the right pipe in series, an oil return opening of the two-position three-way reversing valve is connected with the hydraulic oil tank, and the oil outlet is communicated with either the oil inlet or the oil return opening. According to the hydraulic control system of the extractor accessory, a control instrument is operated by an operator who selects to input related commands to the controller, and thus the hydraulic control system of the extractor accessory can work in a two-way mode or a one-way mode.

The invention relates to a continuous water jet system of energy storing type grinding material slurry. The continuous water jet system comprises two energy storing devices, an oil box and a grinding material slurry pool, wherein the energy storing devices comprise closed cylinder bodies, and an elastic membrane arranged in the middle of each cylinder body is used for dividing each cylinder body into an oil cavity and a slurry cavity; the oil cavities of the two energy storing devices are connected with an oil pump arranged on the oil box through oil-conveying pipes, the oil-conveying pipes are provided with magnetic exchange valves I, slurry cavities of the two energy storing devices are connected with a slurry pump arranged on the grinding material slurry pool through slurry conveying pipes, the pulp conveying pipes are provided with one-way valves, and the slurry cavities are successively connected with the magnetic exchange valves I, a control valve and a nozzle through delivery pipes. The continuous water jet system provided by the invention has the advantages that the structure is simple, elastic membranes are additionally arranged in the cylinder bodies and have good elasticity, the elastic membranes can do flexible movement in the cylinder bodies under the action of variable two-end pressure difference, the elastic membranes and the inner walls of the cylinder bodies do not have a relative movement, an abrasion problem between a floating piston and the cylinder bodies in the traditional system is solved, the two energy storing devices arranged in the system can alternately operate, and the continuous working of the grinding material slurry is realized.

The invention discloses a hydraulic retarder control system and a control method. The control system comprises a magnetic exchange valve controlling a hydraulic retarder. The control system further comprises a hydraulic retarder stepping switch, a control box, a compressed air pipeline, a vehicle auxiliary loading air chamber and a heat exchanger. The control box is connected to the stepping switch of the hydraulic retarder, and the stepping switch provides working signals for the control box. The magnetic exchange valve is connected to the control box, and the control box sends control commands to the magnetic exchange valve. The magnetic exchange valve is connected to the compressed air pipeline. By employing the hydraulic retarder control system, oil can be rapidly charged and discharged for the hydraulic retarder, and the oil charging rate of the hydraulic retarder can be continuously adjusted according to retarding requirements, thereby bringing high reliability and convenient control.

The invention discloses an internal leakage quantity detection device of hydraulic valves. The internal leakage quantity detection device comprises a test bench (3), a support (5), a container (11), an oil inlet pipe (12), an oil outlet pipe (9), a funnel (8), a weighing sensor (7), a transmitter (6), a single-chip microcomputer system (4), a display module (1), a two-position two-way magnetic exchange valve (10) and a button (2). The inlet of the container enables leaked hydraulic oil leaked inside tested hydraulic valves to be stored inside the container (11) which is placed on the weighing sensor (7), the weighing sensor (7) and the transmitter (6) are placed on the support (5), weight of the leaked oil is converted into an electric signal through the weighing sensor (7) and the transmitter (6), the electric signal is converted into a digital signal through analog to digital (A / D) conversion, the digital signal is input into a single chip microcomputer and converted into internal leakage quantity through the single chip microcomputer, and the internal leakage quantity is displayed through the display module (1). The container (11) is specially provided with an outlet controlled by the magnetic exchange valve (10) to prevent the hydraulic oil from overflowing out of the container (11) during a measurement process, actual capacity of the container is measured through the single chip microcomputer, once the actual capacity exceeds the threshold value, measurement is stopped, the magnetic exchange valve (10) is opened through a relay, and the hydraulic oil inside the container (11) is discharged. The internal leakage quantity detection device measures the internal leakage quantity of hydraulic valves in an automatic weighing mode, can expand measurement range, can automatically measure minute leakage quantity, and can provide data basis for comprehensive assessment and performance improvement of batch quality of hydraulic valves.

The invention relates to a hydraulic low-pressure pulse experiment method of an aircraft and belongs to a hydraulic pulse technology. The hydraulic low-pressure pulse experiment method comprises the steps of firstly providing initial pressure required by a test piece for a supercharged oil tank during a pulse experiment, driving a magnetic exchange valve by utilizing a signal generated by a control system when hydraulic pulse pressure begins to produce, and stilling keeping certain pressure after pulse waves attenuate, wherein the pressure is identical to rated pressure of the tested piece; adjusting a precise throttle valve, controlling flows entering a pressure reducing cylinder and achieving the purpose of accurately controlling pulse waveform parameters at an ascent stage. By adopting the hydraulic low-pressure pulse experiment method, the pulse experiment in a flexible connecting assembly qualification test of an aircraft fuel system is achieved, and conditions are provided for localization of flexible connecting assemblies of aircraft fuel systems in outer country.

The invention relates to a multi-station silica gel air bag clamping device for clamping an ultrathin wall deep cylinder part and belongs to the field of microoperation and the micro electromechanical technology. The multi-station silica gel air bag clamping device for clamping the ultrathin wall deep cylinder part particularly comprises an air bag clamping head, a conical surface quick-insertion connector, a multi-station rotary table and a gas circuit system. The air bag clamping head comprises an air bag, a center retainer, a ring fastening gasket and a connection transition part. The conical surface quick-insertion connector comprises a quick-change connector plug and a quick-change connector socket. The multi-station rotary table comprises a 360-degree manual rotary table and a pinboard. The gas circuit system comprises a gas source, a filter, a pressure regulating valve, a speed controlling valve, a magnetic exchange valve and a gas pipe connector. The multi-station silica gel air bag clamping device for clamping the ultrathin wall deep cylinder part solves the problems that clamping of thin-wall parts is small in strength, poor in intensity, and deformation, invalidation and even damage are prone happening. Use of the quick-change connector and the multi-station rotary table can effectively achieve quick and flexible clamping and assembling of parts of different sizes and the same kind, facilitate operation and improve assembling precision and assembling efficiency.

An antenna is fabricated using an M-type hexaferrite, such as a tin (Sn) and zinc (Zn) substituted M-type strontium hexaferrite (Sn / Zn-substituted SrM: SrFe12−2xZnxSnxO19), thereby enabling antenna miniaturization, broad bandwidth, and high gain. In one embodiment, an antenna system has a substrate and a chip antenna formed on the substrate. The system also has a conductive radiator contacting the chip antenna, and the chip antenna comprises an M-type strontium hexaferrite for which Fe cations are substituted with tin (Sn) and zinc (Zn) to achieve soft magnetic properties for the antenna. Thus, the coercivity and permeability are lower and higher, respectively, than those of pure SrM. Such fabricated hexaferrite chip antennas have broadband characteristics and show good radiation performance at various frequencies, including in the GHz frequency range.

A durability test method and a device of a swing mechanism belong to a test method and a device of a hydraulic element. The durability test device is composed of a dynamic hydraulic system circuit, a loading hydraulic system circuit, a braking hydraulic system circuit and a leakage test circuit, wherein the dynamic hydraulic system circuit controls an active swing mechanism; a passive swing mechanism is connected with the loading hydraulic system circuit; the braking hydraulic system circuit controls the opening and closing of the active swing mechanism and the passive swing mechanism; and the leakage test circuit tests the leakage rates of motors of the active swing mechanism and the passive swing mechanism. The invention has the advantages that the dynamic hydraulic system circuit realizes alternated rotation of the swing mechanism in the positive and negative directions via switching control of four magnetic exchange valves; a hydraulic pump adopts electro-hydraulic proportional pressure flow control to conveniently carry out control by a computer; and the computer collects data of each pressure sensor and each flow sensor, draws the data into a curve which is displayed on a computer screen intuitively.