313 results about "Dromaius novaehollandiae" patented technology

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 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 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 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.

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.