313 results about "Dromaius novaehollandiae" patented technology

A magnetic recording element according to an example of the present invention includes a magnetic free layer whose magnetization is variable in accordance with a current direction passing through a film and whose direction of easy axis of magnetization is a direction perpendicular to a film plane, a magnetic pinned layer whose magnetization is fixed to a direction perpendicular to the film plane, and a non-magnetic barrier layer between the magnetic free layer and the magnetic pinned layer. In the magnetic free layer, a relation between a saturated magnetization Ms (emu / cc) and an anisotropy field Han (Oe) satisfies Han>12.57 Ms, and Han<1.2 E 7 MS-1+12.57 Ms.

The invention discloses magnetic microsphere resin for removing nitrate nitrogen selectively, and a preparation method thereof, and belongs to the field of ion exchange resin. The resin consists of a resin skeleton, and magnetic granules wrapped in the resin skeleton; and the resin skeleton has a basic structural formula shown in the specification, wherein B is a quaternary ammonium salt group for adsorbing the nitrate nitrogen selectively, the saturation magnetization intensity of the quaternary ammonium salt group is between 5 and 30 emu / g, the exchange capacity of strong base is between 3.0 and 4.5 mmol / g, the exchange capacity of weak base is between 0.5 and 1.5 mmol / g, and the average grain diameter of the resin is between 50 and 500 micrometers. The resin is synthesized by a suspension polymerization method; acrylate monomers are mixed with a pore-forming agent and an initiator to form an oil phase; after being mixed with the magnetic granules uniformly, the mixture is subjectedto suspension polymerization with an aqueous phase mixed with a dispersing agent to form the magnetic polymer granules, and the magnetic polymer granules are subjected to aminolysis and alkylation toform the resin serving as a finished product. The resin can adsorb negative ions such as nitrates, nitrites and the like in a water body selectively, so the magnetic microsphere resin has a bright application prospect in fields of drinking water treatment, groundwater remediation and the advanced treatment of urban domestic sewage.

A dynamic monitoring method and system for vehicle information of multiple unit trains mainly solve the problem of effectively combining real-time monitoring data of WTD equipment with the locomotiverunning time, running speed and mileage information and realizing the real-time monitoring and analysis of the WTD equipment in a running process of the multiple unit trains. The system comprises a vehicle-mounted information acquisition device, a ground server and a user terminal. The method comprises the following steps: enabling the vehicle-mounted information acquisition device of the system to acquire the running state information, vehicle door information, lifting bow information, vacuum circuit breaker (VCB) state information and equipment fault information of the WTD equipment and thetrain running speed, location and other information, performing data encryption, and then transmitting the data to the ground server, enabling the ground server to classify and store the received dataafter parsing and analyzing the data, enabling the user terminal to receive the WTD equipment monitoring data and train running data sent by the server through a railway office network, and displaying the monitoring data in real time in numerical and curve forms.

An object of the present invention is to provide a carrier containing core material particles having magnetism and a coating layer on the surfaces of the core material particles, wherein the core material particles have a magnetization at a magnetic field of 1,000 Oersted of 40 emu / g to 100 emu / g, and the carrier has a weight average particle diameter of 20 μm to 45 μm, a resistance (LogR) of 11 Ω·cm to 17 Ω·cm and a relaxation time τ of 150 seconds to 800 seconds.

The present invention discloses a preparation method for a high resistivity bismuth ferric-barium titanate solid solution magnetoelectricity ceramic material. The method comprises the following steps: 1) based on a general formula of a ceramic material, weighing raw materials according to a stoichiometric ratio, placing the raw materials in a ball mill to carry out wet milling and mixing, and drying; 2) placing the mixed powder in a box type high temperature electric furnace to carry out pre-synthesis; 3) carrying out coarse crushing, wet milling, and fine crushing for the pre-synthesized material, then drying, carrying out mixing and pelletizing for the dried powder and a binder, then carrying out pressing to prepare a thin disc biscuit; 4) carrying out heat preservation and binder removing for the biscuit; 5) carrying out sintering and heat preservation for the binder-removed biscuit to obtain the bismuth ferric-barium titanate solid solution magnetoelectricity ceramic material. According to the present invention, the bismuth ferric-barium titanate solid solution magnetoelectricity ceramic material of the present invention has characteristics of a complete perovskite structure and excellent electrical insulation property, the Curie temperature of the ferroelectricity material is more than 350 DEG C, the Curie temperature of the ferromagnetic material (the anti-ferromagnetic material) is more than 350 DEG C, the room temperature remanent polarization Pr is more than 18 muC / cm<2>, the remanent magnetization Mr is 0.49 emu / g, such that the multiferroic material with the high magnetoelectric coupling coefficient has the application and development value.

The invention discloses a method for suppressing low-frequency oscillation of high-speed rail based on model predictive current control, comprising the following steps: constructing an Electric Multiple Units network side rectifier AC-side voltage and current dynamic characteristic relation; getting a current prediction model under a d-q two-phase rotating coordinate system through decoupling by a second-order generalized integrator; making compensation for control calculation delay through a two-step prediction method; calculating the partial derivative with respect to voltage variation for a quality function, and getting a voltage variation value minimizing the quality function; and carrying out SPWM modulation on the control voltage to get a control pulse. The fast dynamic response characteristic and the harmonic suppression effect of control are improved. Moreover, the total harmonic distortion is low, the current distortion is low, the DC voltage overshoot is small, and the dynamic response is fast. The electrical low-frequency oscillation problem of the traction network EMU can be suppressed. When the external parameters of the system change in a small range, the train network system does not oscillate compared with the transient DC oscillation mode and the oscillation peak.

The invention relates to a preparation method of a magnetic polymer dye adsorbent. An improved chemical co-precipitation method is adopted to prepare magnetic nano particles. Then the surface of nano particles is modified by using gamma-chloropropyl trimethoxysilane and polyethyleneimine to obtain polyethyleneimine modified magnetic nano particles. Finally, polyethyleneimine modified magnetic nano particles and functional monomers carry out copolymerization to prepare the magnetic polymer dye adsorbent with a multilayer crosslinking structure and multiple adsorption groups. The saturation magnetization intensity is 3.5 to 15.5 emu / g. The residual magnetism and coercive force are close to zero. The dye adsorbent has para-magnetism and magnetic responsiveness. For a dye water solution with a primary concentration of 100 to 1000 mg / L, the dye adsorption capacity can reach 50 to 600 mg / g; and the adsorption balance is reached within 60 to 150 minutes. After the dye adsorbent is repeatedly used for five times, the dye adsorption capacity exceeds 90% of first adsorption capacity. The dye adsorbent can be applied to dye adsorption separation and dye wastewater pollution treatment.

An Emulator (EMU) configures a monitoring condition relevant with critical data of a game role, when the monitoring condition is met, the EMU transmits the critical data of the game role to a server; the server analyzes the critical data of the game role; when determining that the critical data of the game role is unusual, the server determines that the game role has used a plug-in.

The invention provides a nano-ferroferric oxide sol-gel method production process which adopts ferrous chloride, ferric chloride, ammonia water and oleic acid as main raw materials to synthesis of nano-ferroferric oxide, and adopts the oleic acid to carrying out modification. The method provided by the present invention has advantages of simple experiment equipment, convenient operation and large output. The nano-ferroferric oxide provided by the present invention has characteristics of uniform particle size, good dispersity, stable magnetism, a mean diameter of 15 nm, a saturation magnetization of 55 emu / g. In addition, due to presenting the superparamagnetic, the nano-ferroferric oxide materials can be applicable for a plurality of fields such as chemical engineering, machinery, electronic industry, printing, medicine and the like; meanwhile, due to remarkable magnetic susceptibility and gas and humidity sensing properties, the nano-ferroferric oxide provides great application prospects for a plurality of the fields such as high-density magnetic recording materials, air and humidity sensor parts, magnetic separation of immune cells, magnetic resonance imaging, drug controlled release and the like.

The present invention relates to a carbon nanotube encapsulated cobalt and oxide (CoO and Co3O4) nanosphere absorbing material thereof and a preparation method thereof, and belongs to the electromagnetic wave absorbing material technology field. The micro-morphology of the absorbing material is a hollow rhombic dodecahedron structure composed of the carbon materials, the carbon nanotubes grow on the surface of the rhombic dodecahedron structure, and a cobalt and an oxide nanosphere thereof are encapsulated at the end at the outer side of each carbon nanotube. The size of the rhombic dodecahedron structure is 400-550nm, the external diameter of each carbon nanotube is 14-16 nm, and the internal diameter is 11-13 nm; the diameters of the cobalt and the oxide nanosphere thereof are 11-13 nm,the proportion of the amorphous carbon and the graphitized carbon in the absorbing material is 1: 0.79-1.17, and the saturation magnetization intensity of the absorbing material is 27.83-39.4 emu / g; the maximum electromagnetic wave absorption exceeds -40 dB, and an effective absorption range exceeds 4.5 GHz. After using the 1M sulfuric acid or 1M ammonia to process 6-12 hours, the maximum electromagnetic absorption of the absorbing material still exceeds -40 dB, and the effective absorption range exceeds 4.5 GHz, thereby having the immense potential at the aspect of the electromagnetic wave absorbing material.

The invention discloses a high ferro and low frequency oscillation suppression method based on sliding mode control, comprising the steps of defining grid-side current orthogonal and establishing a state space model of a motor-car networking side rectifier under a dq rotating coordinate; selecting the output of a control system with the combination of a control object, and establishing two sliding-mode surfaces based on outer-ring voltage control, and obtaining a reference value of grid-side reactive component of current, and completing the calculating of a sliding-mode surface expression; selecting sliding mode control tendency rate for the two sliding mode surfaces, and substituting the two sliding mode surfaces into the sliding mode control tendency rate, and substituting the result into the state space model of a motor-car networking side rectifier under the dq rotating coordinate, obtaining a switch function, and multiplying the switch function with DC side voltage, obtaining control voltage; obtaining an Alfa Belta coordinate system component through the coordinate transformation of control voltage, and outputting control impulse through sine pulse width modulation. The invention is advantageous in that dynamic response and robustness of the rectifier can be effectively improved, and the low frequency oscillation of motor-car electrical quantities can be suppressed.

The invention discloses a preparing method for thermosensitive magnetic composite microspheres. Superparamagnetic microspheres are prepared through a hydrothermal method, subjected to surface modification through a silane coupling agent and then subjected to an amidogen carboxyl association reaction with unsaturated olefine acid to introduce double bonds; on the other hand, N-isopropylacrylamide or a derivative of the N-isopropylacrylamide serves as a monomer, sulfo ester serves as a chain transfer agent, a polymer with narrow molecular weight distribution is synthesized through a reversible addition-fragmentation chain transfer reaction under the action of an initiator, and then the prepared polymer is subjected to a reduction reaction under the effect of a nucleophilic reagent and a reducing agent; lastly, the thermosensitive magnetic composite microspheres are prepared through a click chemistry reaction. The microspheres have magnetic responsiveness and thermosensitivity, magnetic responsiveness is high, the saturated magnetic intensity ranges from 30 emu / g to 56.8 emu / g, and the particle size of the microspheres ranges from 290 nm to 590 nm. According to the preparing method, raw materials are easy to obtain, and the particle size of the prepared microspheres is controllable; the microspheres can be applied to the fields of medicine controlled release, intelligent separation and the like.

The present invention relates to a method for synthesizing superparamagnetic ferroferric oxide nano-sheets. The method comprises: adding a trivalent soluble iron salt and a divalent soluble iron salt to hydrochloric acid to form a uniform mixed solution, adding the mixed solution to a NaOH solution in a dropwise manner under vigorous stirring, carrying out magnetic attraction on the precipitate after completely reacting, washing a plurality of times with deionized water and ethanol, and carrying out vacuum drying at a temperature of 50-90 DEG C to obtain the superparamagnetic ferroferric oxide nano-sheets. Compared with the method in the prior art, the method of the present invention has characteristics of simple operation, no requirement of inert gas protection, performing at the room temperature, simple reaction conditions and easy operation. The superparamagnetic ferroferric oxide nano-sheets prepared by adopting the reversed-phase co-precipitation method have the small particle, the diameter of 10-30 nm, the saturation magnetization of 77.8 emu / g, and the residual magnetism of 0, and have the superparamagnetism so as to be easily used in the field of biomedicine and bioengineering.

The method for overhauling the bogie assembly line of motor vehicles involved in the present invention is divided into seven overhaul modules and 16 overhaul procedures according to the overhaul content, and the seven overhaul modules include a pre-decomposition module, a cleaning module, a decomposition module, a framework overhaul module, and an assembly module , test module and acceptance module, 16 maintenance procedures are included in seven maintenance modules, the seven maintenance modules and 16 maintenance procedures form an assembly line according to the order of maintenance operations, and are equipped with convenient parts delivery methods to realize the bogie of EMU vehicles High-quality and efficient maintenance.

The invention belongs to the technical field of brake materials, and discloses a friction material, a high-speed train brake pad made thereof and a method for manufacturing the brake pad. Components of the friction material are mutually matched, thereby effectively improving high temperature resistance of the friction material, reducing a heat fading phenomenon, ensuring stability of a friction coefficient during the working process, and improving driving safety. The friction material has a tolerable temperature of up to 700 DEG C, and fully satisfies the braking energy load requirements of a160 km / h power concentrated EMU train, thereby preventing the brake failure caused by the high temperature of the brake pad and ensuring the driving safety.

The invention relates to a crosslinkable polyaryl ether nitrile / ferroferric oxide hybridized microspherical magnetic material and a manufacturing method thereof. The crosslinkable polyaryl ether nitrile / ferroferric oxide hybridized microspherical magnetic material is a hybridized material composed of crosslinkable polyaryl ether nitrile and ferroferric oxide and in a microsperical shape and can be processed into plates, blocks or thin films, a large number of crosslinkable radicals and groups are contained in the surface of the material, and performance of the material can be further improved through a high temperature crosslinking reaction. The crosslinkable polyaryl ether nitrile / ferroferric oxide hybridized microspherical magnetic material is prepared by making crosslinkable polyaryl ether nitrile and iron chloride hexahydrate be subjected to a solvothermal crystallization reaction under the action of a reducing agent. A series of hybridized magnetic materials having different morphologies and electromagnetic properties can be obtained by changing the content of crosslinkable polyaryl ether nitrile, the saturation magnetization intensity of the magnetic material is 40-80 emu / g, the residual magnetization intensity is 15-40 emu / g, and the maximum reflection intensity for electromagnetic waves ranges from minus 20 dB to minus 30 dB. The magnetic material belongs to the technical field of organic polymer magnetic materials and can particularly serve as an electromagnetic shielding / adsorption material.

The invention discloses a preparation method of nickel plated glass fibers and magnetic conductive rubber prepared by the nickel plated glass fibers, belongs to the technical field of conductive rubber preparation, and solves the problem that existing metal conductive filling materials has high density and high cost and can not meet the development of modern electronic industry. A certain amount of glass fibers are added into a hot alkali solution, a roughing solution, a sensitization solution, and an activating solution respectively for preplating treatment; then the glass fibers are added into a nickel plating solution to obtain nickel plated glass fibers with excellent conductivity; the obtained nickel plated glass fibers are added into a silicone rubber matrix; and magnetic conductiverubber is obtained through a traditional rubber preparation method. The conductive rubber prepared by the method of the invention has volume resistivity which is reduced to a lowest value of 0.04 omega.cm, remanent magnetization of 0.1-0.5 emu / g, and coercivity of 80-100 Oe.

A repairing emu fat cream is proporionally prepared from emu fat, the extract of arnebia root, emu collagen peptide, antioxidant and emulsifier through pulverizing the extract of arnebia root to obtain micron-class particles, proportionally mixing with others, heating to 80-85 deg.C, high-speed homogenizing, and cooling.

The invention discloses a core-shell magnetic poly(m-phenylene diamine) nano-particle, a preparation method and application thereof, and belongs to the field of synthesis and water treatment research on a magnetic composite material. The preparation method comprises the following steps: regarding ferroferric oxide as a core, regarding persulfate as an initiator, regulating and controlling the rate of polymerization of the m-phenylene diamine on the surface interface, and firstly realizing uniform packaging of poly(m-phenylene diamine) to the magnetic particle. The method can effectively control the shell thickness of poly(m-phenylene diamine); the product is uniform in morphology, controllable in size, and high in magnetism (127.33-73.78 emu g<-1>); the adsorption capability of the obtained composite magnetic particle to chromate is up to 239.5 mg g<-1>, and the magnetic particle is easy to separate out and recover.

The invention discloses a magnetic macromolecular adsorption material, a preparation method and application, and belongs to the field of the magnetic macromolecular materials. The preparation method of the magnetic macromolecular adsorption material includes the following steps that 1, magnetic nanoparticles are prepared; 2, the magnetic nanoparticles are dissolved in a pore-foaming agent, N-vinylpyrrolidone, divinylbenzene and an initiating agent are added separately and mixed with the magnetic nanoparticles to be uniform; 3, an emulsifying agent and a dispersing agent are added into a watersolution, part of an oil-phase solution prepared in the step 2 is added at 60 DEG C or below, the rest of the oil-phase solution is added when temperature is increased to 60 DEG C or above, stirring is conducted to carry out reaction, then, precipitation, filtration, washing and drying are conducted, and finally, the magnetic macromolecular adsorption material is obtained. The particle diameter ofthe magnetic macromolecular adsorption material is 2-100 micrometers, the magnetization intensity is 5-19.5 emu / g, the specific surface area is 210-950 m<2> / g, and the particle diameter of the magnetic macromolecular adsorption material can be applied to adsorbing inorganic and organic substances in solutions, controlling the inorganic and organic substances to be released and separating different substances.

The invention relates to a bimetallic cobalt-based core-shell material and a preparation method and application thereof. A core of the bimetallic cobalt-based core-shell material is a magnetic metal Co, and a shell of the bimetallic cobalt-based core-shell material is a non-magnetic metal Ag or Cu; a shape of the bimetallic cobalt-based core-shell material is fibrous or spherical, a fiber diameteris 1.3 to 36 micrometer, and a spherical diameter is 1 to 7.3 micrometer; an atomic ratio of Co to Cu is 0.25 to 21.6, and the atomic ratio of Co to Ag is 59.8 to 74.8; a saturation magnetization strength ranges from 62.2 to 159.9 emu / g<-1>. The bimetallic cobalt-based core-shell material adopts an in-situ metal replacement method and has a microwave absorption characteristic of broadband and high absorption, wherein an effective frequency band width of which the reflectivity is less than or equal to -10dB is 5.1-7.76GHz; a bandwidth less than or equal to -20dB is 2.32-16.0GHz; a maximum reflection loss ranges from -52.5 dB to -19.7 dB. The bimetallic cobalt-based core-shell material has the advantages of simple process, easy industrial popularization, excellent material performance and good application prospect in the fields of catalysis, electrode materials, microwave absorption, high-density magnetic recording materials, sensors and the like.

Spin-transfer torque memory having a compensation element is disclosed. The spin-transfer torque memory unit includes a synthetic antiferromagnetic reference element, a synthetic antiferromagnetic compensation element, a free magnetic layer between the synthetic antiferromagnetic reference element and the synthetic antiferromagnetic compensation element, and an electrically insulating and non-magnetic tunneling barrier layer separating the free magnetic layer from the synthetic antiferromagnetic reference element. The free magnetic layer has a saturation moment value greater than 1100 emu / cc.

In a stepping motor having a stator provided with an electromagnet and a rotor composed of a hard magnetic alloy, the hard magnetic alloy comprises at least one element T of Fe and Co, at least one element R of rare earth elements and B, has a remanence ratio of at least 0.7, remanent magnetization (Ir) of at least 120 emu / g and coercive force (iHc) of at least 1 kOe and includes a fine crystalline phase having an average crystal grain size of 100 nm or less as a main phase. The hard magnetic alloy is solidified and compacted by making use of a softening phenomenon which arises when the amorphous phase contained in the structure of the hard magnetic alloy is crystallized. A method of manufacturing the hard magnetic alloy used to the stepping motor is also disclosed.

The invention provides a method for preparing composite ferrite from lithium battery cathode waste.The method comprises the following steps that lithium battery cathode waste (LiFePO4) of which aluminum foil is removed is treated, and filtrate containing Li<+> and Fe<2+> is obtained; the filtrate is added into electroplating waste water containing Cr<6+>, stirring is conducted to be uniform, a trivalent iron source is added, the pH value is adjusted to be alkaline after the trivalent iron source is dissolved, and a hydrothermal reaction is conducted at high temperature; precipitates are collected, washed and dried, and the composite ferrite is obtained.Compared with the prior art, the method for preparing the composite ferrite from the lithium battery cathode waste has the following advantages that the method of treating the waste with waste is adopted, Fe<2+> in the lithium battery cathode waste (LiFePO4) is used for reducing Cr<6+> in the electroplating waste water, and the composite ferrite which is high in quality and is of a spinel structure is obtained by means of the high-temperature hydrothermal reaction; the saturation magnetization intensity of the prepared composite ferrite can reach 100 emu / g, and the magnetic performance of the prepared composite ferrite is obviously superior to that of composite ferrite obtained through water bath by means of a coprecipitation method.

The invention relates to a method for automatically regulating optical power. The method comprises steps as follows: after a dynamic power control function is started, a head node duly transmits an output optical power value as an output optical power value expected by downstream nodes to the downstream nodes through a 2.112M data channel, element management U-disks (EMU) of the downstream nodes monitor a difference between the output optical power of the current node and the expected output optical power through acquiring an output power value of an amplification disk; and when the head node increases or reduces the quantity of carriers or line attenuation is increased to cause that the difference changes and exceeds a regulating threshold, the EMUs automatically send a regulating command to the amplification disk for regulating the power output value. According to the invention, the EMUs are cooperated with a web master, an optical supervisory channel (OSC) and the amplification disk to be capable of automatically carrying out power transmission and processing and completing an automatic optical power regulation function, and the purpose of dynamically regulating the output optical power of each node to an ideal output value is achieved without manual control and regulation.

The invention provides a method for ultrasonically preparing a Fe3O4 nano-particle in the condition of ammonia dispersion, comprising the following steps of: under protection of nitrogen, leading ammonia into a solution dissolved with iron ions and ferrous iron particles, ultrasonically dispersing for 30-70 mins at the temperature of 25-45 DEG C, and producing a pitchy sediment product in the solution; cooling to the room temperature, washing respectively with distilled water and ethanol and vacuum drying to finally obtain the Fe3O4 nano-particle. Discovered by analyzing the magnetic performance of the product by a vibrating sample magnetometer that, in the condition without an external magnetic field, the remanence and the coercivity of the particle can both be neglected, the saturation magnetization is 62-75 emu / g, and the particle shows superparamagnetism at the room temperature, also has higher magnetic responsiveness and has potential application prospect in a drug delivery system and the catalysis field.