Abstract: The invention relates to a weight and reference quaternion correction unscented quaternion estimation method, comprising: obtaining measurement data as quantity measurement through a gyro and a star sensor; establishing a quaternion-based discrete spacecraft nonlinear state space model; estimating an error quaternion, a gyro drift and a corresponding error covariance at a k moment by using an unscented quaternion estimator based on parameter and reference quaternion correction at a k?1 moment; and setting a filtering time as Ntime, if k<Ntime, then repeating the step 3, if k=Ntime, then finishing filtering, and outputting the attitude quaternion, the gyro drift and the corresponding error covariance.

Abstract: The present disclosure relates to the technical field of wood preparation, and in particular, to a method and device for preparing a magnetic bamboo wood. A technical problem to be solved in the present disclosure is that: Lignin in a wood will affect the soaking efficiency of the wood during soaking of the wood. In the present disclosure, sodium hydroxide and sodium sulfite in a ratio of 2:1 are put into the soaking bucket in sequence through the high-precision powder weighing equipment and are fully dissolved in distilled water to obtain a solution, so that the solution reacts with the lignin in the bamboo wood to elute the lignin, which increases the porosity of the bamboo wood, improves the soaking efficiency, and improves the magnetism of the bamboo wood.

Abstract: A mixed rare earth concentrate mineral and suspended mineral phase transformation-clean leaching system and a use method thereof are provided. The system comprises a Venturi dryer, a multi-stage separator, a suspension preheating decomposition furnace, a multi-state fluidization sealing valve, a mineral phase transformation machine, a ball mill, a multi-stage acid leaching tank, an alkali leaching tank and a neutralization tank.

Abstract: A regulator circuit is presented. The regulation circuit (530) has a regulation switch (131), a voltage comparator (537) with predetermined offset voltage and an adjuster. The regulation switch (131) has a first terminal coupled to a current source (132), a second terminal connectable to a load (110), and a control terminal. The voltage comparator (537) compares a sum voltage of the offset voltage added to a voltage at the second terminal with a control voltage at the control terminal, and generates a comparison signal. The adjuster adjusts the voltage at the second terminal based on the comparison signal to control a difference voltage between the control terminal and the second terminal of the regulation switch and to maintain the regulation switch operating in a desired region of operation.

Abstract: The present invention relates to a method for preparing a nano-titanate, a nano-titanic acid and a nano-TiO2 containing doping E or embedding E nanoparticles, and the use thereof. By using an E-doped Ti-T intermetallic compound as a titanium source, and reacting it with alkaline solution at atmospheric pressure and near its boiling-point temperature, an E-doped titanate nanofilm is prepared with high efficiency and in a short time. Through acid treatment and (or) heat treatment, a titanate nanofilm containing embedding E nanoparticles, an E-doped titanic acid nanofilm, and a titanic acid nanofilm and a TiO2 flake powder containing embedding E nanoparticles can be further prepared. Through a subsequent reaction at high temperature and pressure, the preparation of an E-doped titanate nanotubes and titanic acid nanotubes, and titanic acid nanotubes and TiO2 nanotubes/nanorods containing embedding E nanoparticles can be achieved in high efficiency and low-cost.

Abstract: A method for preparing a nano-titanate, a nano-titanic acid and a nano-TiO2 containing embedded A nanoparticles is provided respectively. In this method, a Ti-T alloy with a A-group element solidly dissolved therein is used as a titanium source, and reacted with an alkali solution under a certain condition. In combination with subsequent treatment, the preparation of a titanate nanotube, a titanic acid nanotube, and a TiO2 nanotube/rod containing embedded A nanoparticles, respectively, is further achieved with high efficiency and low cost. Moreover, a method for preparing metal nanoparticles is also provided by removing the matrix of the composites. The present preparation methods is characterized by simple process, easy operation, high efficiency, low cost. The product is of promising application in polymer-based nanocomposites, ceramic materials, catalytic materials, photocatalytic materials, hydrophobic materials, effluent degrading materials, bactericidal coatings, anticorrosive coatings, marine coatings.

Abstract: The present disclosure discloses a multiplexing topological structure for simultaneously realizing control of a duplex-winding motor and charging of an on board charger. By controlling the connecting and disconnecting state of a specific relay, the bidirectional switching between the control topology of the duplex-winding motor and the charging topology of the on board charger is realized. In the duplex-winding motor control mode, the topology is divided into a battery module, a duplex-winding motor power control module, a duplex-winding motor power control module, a duplex-winding motor winding module and a duplex-winding motor winding module; in the on board charger charging mode, the topological structure is divided into a electric supply module, a PFC inverter circuit module, an inverter module, an isolation transformer module, a rectifier module and a battery module.

Abstract: The invention relates to a weight and reference quaternion correction unscented quaternion estimation method, comprising: obtaining measurement data as quantity measurement through a gyro and a star sensor; establishing a quaternion-based discrete spacecraft nonlinear state space model; estimating an error quaternion, a gyro drift and a corresponding error covariance at a k moment by using an unscented quaternion estimator based on parameter and reference quaternion correction at a k?1 moment; and setting a filtering time as Ntime, if k<Ntime, then repeating the step 3, if k=Ntime, then finishing filtering, and outputting the attitude quaternion, the gyro drift and the corresponding error covariance.

Abstract: A method for preparing a nano-titanate, a nano-titanic acid and a nano-TiO2 containing embedded A nanoparticles is provided respectively. In this method, a Ti-T alloy with a A-group element solidly dissolved therein is used as a titanium source, and reacted with an alkali solution under a certain condition. In combination with subsequent treatment, the preparation of a titanate nanotube, a titanic acid nanotube, and a TiO2 nanotube/rod containing embedded A nanoparticles, respectively, is further achieved with high efficiency and low cost. Moreover, a method for preparing metal nanoparticles is also provided by removing the matrix of the composites. The present preparation methods is characterized by simple process, easy operation, high efficiency, low cost. The product is of promising application in polymer-based nanocomposites, ceramic materials, catalytic materials, photocatalytic materials, hydrophobic materials, effluent degrading materials, bactericidal coatings, anticorrosive coatings, marine coatings.

Abstract: The present invention relates to a method for preparing a nano-titanate, a nano-titanic acid and a nano-TiO2 containing doping E or embedding E nanoparticles, and the use thereof. By using an E-doped Ti-T intermetallic compound as a titanium source, and reacting it with alkaline solution at atmospheric pressure and near its boiling-point temperature, an E-doped titanate nanofilm is prepared with high efficiency and in a short time. Through acid treatment and (or) heat treatment, a titanate nanofilm containing embedding E nanoparticles, an E-doped titanic acid nanofilm, and a titanic acid nanofilm and a TiO2 flake powder containing embedding E nanoparticles can be further prepared. Through a subsequent reaction at high temperature and pressure, the preparation of an E-doped titanate nanotubes and titanic acid nanotubes, and titanic acid nanotubes and TiO2 nanotubes/nanorods containing embedding E nanoparticles can be achieved in high efficiency and low-cost.

Abstract: Provided are: a highly durable polymer having a high hole-injection/transport capacity; and a composition for an organic electroluminescent element, which contains the polymer.

Abstract: Provided are: a highly durable polymer having a high hole-injection/transport capacity; and a composition for an organic electroluminescent element, which contains the polymer.

Abstract: A composite structure comprising a resinous component that is adhered to a surface of a metal component is provided. The resinous component is formed from a polymer composition that comprises a polyarylene sulfide, inorganic fibers, and an impact modifier. The inorganic fibers have an aspect ratio of from about 1.5 to about 10.

Abstract: A solid-phase synthesis carrier, a preparation method therefor and the use thereof, wherein a diene cross-linking agent with a similar reactivity ratio to styrene and two vinyl groups thereof not on the same benzene ring is selected as a cross-linking monomer, and is subjected to suspension polymerization to obtain a porous resin. The porous resin is then functionalized to obtain a porous resin with an amino or hydroxyl functional group. Compared with existing preparation methods, the reactivity ratio of the cross-linking agent and styrene is similar, which is beneficial to improving the uniformity of the chemical structure in the resin, forming uniformly distributed active sites and channels, and is beneficial to improving the reaction efficiency and reducing the mass transfer resistance. The preparation of oligonucleotides by using such a carrier as a solid-phase synthesis carrier can improve the yield and purity of the oligonucleotides.

Abstract: The invention relates to a 2-isopropyl malate synthase, a genetically engineered bacterium for producing L-leucine and application thereof and belongs to the field of metabolic engineering. The genetically engineered bacterium is obtained by overexpressing an isopropyl malate synthase coding gene leuAM for relieving feedback inhibition by L-leucine, an acetohydroxy acid synthase coding gene ilvBNM for relieving feedback inhibition by L-isoleucine, a 3-isopropyl malate dehydrogenase coding gene leuB and a 3-isopropyl malate dehydratase coding gene leuCD in host cells. The genetically engineered bacterium for producing the L-leucine is free from nutritional deficiency, rapid in growth, short in fermentation period, high in yield and high in conversion rate.

Abstract: Provided are a proline hydroxylase and uses thereof. The proline hydroxylase comprises having the amino acid sequence of SEQ ID NO: 2 with the exception of a mutation of one or more amino acids; wherein the mutation of one or more amino acids must comprises E27K, and the mutation of one or more amino acids selected from the group consisting of: H14R, L16N, T25R, F26L, E27K, D30S, S33N, E34N, E34G, E34L, E34S, E34D, Y35W, Y35K, S37W, S37F, S37E, S37N, S37T, S37C, W40F, K41E, D54G, H55Q, S57L, I58T, I58Y, I58A, I58R, I58V, I58S, I58C, K86P, T91A, F95Y, C97Y, I98V, K106V, K106T, K106Q, F111S, K112E, K112R, S154A, K162E, L166M, I118F, I118V, I118R, H119R, H119F, I120V, K123D, K123N, K123Q, K123S, K123I, K123T, T130N, D134G, V135K, N165H, D173G, K209R, I223V and S225A, and having proline hydroxylase activity.

Abstract: A porous resin used to solid phase synthesis and a preparation method therefor, specifically being a porous resin having functional groups being an amino group or a hydroxyl group and a preparation method therefor. Using an olefin compound containing two cyano groups as a modified monomer, using a high internal phase emulsion as a pore-foaming agent, and performing suspension polymerization to prepare the porous resin. And then functionalizing the porous resin to obtain the porous resin having functional groups being an amino group or a hydroxyl group. Different from the existing preparation method, the modified monomer can make the distribution of the functional groups more uniform, and make the swelling degrees of the porous resin in different solvents close. The high internal phase emulsion pore-foaming agent can make the pore size distribution of the carrier narrower.

Abstract: A double-layer coiled tubing double-gradient drilling system, on the basis of conventional drilling equipment, includes a double-layer coiled tubing system, separating fluid, a downhole lifting pump system, throttling control systems and a data monitoring system. Power fluid enters an annular space of the tubing through an adapter, passes through a downhole lifting pump, enters an inner pipe through a bridge channel, and enters the bottom hole through the drill bit. Return fluid enters an annular channel of the tubing through a recovery hole, then enters the inner pipe through the bridge channel and enters the lifting pump, and then enters a solid control system through the adapter and the control systems in sequence. Gradient control of the bottom hole pressure is realized through monitoring of the separating fluid and control of the drilling pump unit and throttling control systems. The problem of narrow safe drilling density window is solved.

Abstract: The disclosure discloses a solid fluidization tubular separator for marine natural gas hydrate, which includes a first separator and a second separator, wherein the first separator includes the first separation sleeve, the power liquid pipe, the swirl baffle, the recovery mechanism and the sand discharge mechanism. After the hydrate is sucked into the first separation sleeve to generate a circumferential velocity, so that the mud and sand with high density are separated to the pipe wall of the first separation sleeve, and the mud and sand separated to the pipe wall are settled down from the gap between the swirl baffle and the pipe wall along the pipe wall. The hydrate swirl flows into the recovery mechanism, and then leaves the first separation sleeve and enters the second separator, so as to realize the separation of mud and sand and natural gas hydrate.