59results about How to "Broaden research ideas" patented technology

The invention discloses a double-assistance circular spherical steering system and a control method thereof. The system comprises a steering wheel, a steering tubular column, a torque sensor, a segment gear, a bidirectional gear and worm reducing mechanism, a steering rocker arm, a steering transverse pull rod, wheels, a vehicle speed sensor, a yaw velocity sensor, an electronic control unit and a left-right assistance motor. In a running process, the electronic control unit acquires signals of the torque sensor, the yaw velocity and the vehicle speed, difference between the perfect yaw velocity and the actual yaw velocity is calculated, the compensation torque of the double-assistance motor is recalculated by a designed adaptive fault-tolerant controller, and a ECU transmits pulse to control running of the adaptive fault-tolerant controller to finish control on stability of an automobile under the normal condition and under the condition that an actuator fails partially. Adaptive fault-tolerant control on the double-assistance circular spherical steering system can be realized, and reliability of the steering system and stability and safety of the automobile during running are improved.

The invention discloses an image abstract generation method based on object detection, which comprises the following steps: feature extraction of image local area, attention mechanism system and imagedescription generation. The feature extraction of image local area is connected with the attention mechanism system, and the attention mechanism system is connected with the image description generation. The image local region feature extraction adopts Faster RCNN detection method to extract image region feature, and Faster RCNN consists of three parts: original image feature extraction, RPN network and ROI pooling. The present invention applies the object detection algorithm to the image summary task, and uses the local area image feature to represent the whole image, which greatly reduces the calculation amount and the waste of resources without losing the image information. The invention expands the research thought of the image summary task, and has certain reference value for the research of the image summary task.

The invention discloses a preparation method for a cationic side chain esterified-grafted highly-mud-resistant cement dispersing agent, and belongs to the field of dispersing agents. The preparation method comprises the following steps: performing free radical polymerization on an unsaturated carboxylic acid monomer serving as a reactant to obtain a polycarboxylic acid main chain under the action of an initiator and a chain transfer agent, performing free radical polymerization on an unsaturated cationic quaternary ammonium salt monomer serving as a reactant to obtain a hydroxyl-terminated cationic side chain under an oxidization-reduction initiation system formed by high-valence ceric salt and alcohol, and performing esterification-grafting reaction on the polycarboxylic acid main chain, the hydroxyl-terminated cationic side chain and a polyethylene glycol compound in the presence of a catalyst. According to the preparation method, a process is simple and easy to control, and the preparation method is low in cost, energy-saving, efficient, environment-friendly and free of pollution; a composite side chain structure is modified and synthesized by a molecular structure design, so that side chain steric hindrance effects are successfully achieved, cationic charge arrangement is successfully implemented, water reduction and slump retaining characteristics and clay side effect suppression capabilities higher than those of an ordinary polycarboxylic acid water reducing agent are achieved, and the dispersing agent has broad market prospect and great popularization and application potential.

The invention belongs to the technical field of high polymer materials, and discloses a polypropylene/montmorillonite/graphite nanocomposite material and a preparation method for the polypropylene/montmorillonite/graphite nanocomposite material. The composite material is prepared from the following constituents in parts by weight: 100 parts of polypropylene, 1-10 parts of organically-modified montmorillonite, 0.1-1 part of maleic anhydride, 0.01-0.1 part of an initiator, 1-12 parts of graphite, 0.01-1 part of an antioxidant and 1-10 parts of a lubricant. The preparation method comprises the following steps of: mixing 5-40 parts of polypropylene in the 100 parts of polypropylene with the 1-10 parts of organically-modified montmorillonite, the 0.1-1 part of maleic anhydride and the 0.01-0.1 part of the initiator for 5-20 minutes, extruding at 190-220 DEG C by a double-screw extruder to granulate, so as to obtain maleic anhydride-grafted polypropylene master batches containing organic montmorillonite; and then mixing the remainder polypropylene in the 100 parts of polypropylene with the 1-10 parts of the lubricant, 0.01-1 parts of the antioxidant, the master batches obtained in the step aforementioned, and 1-12 parts of graphite for 5-20 minutes, extruding at 200-230 DEG C by a double-screw extruder to granulate, so as to prepare the composite material. The composite material is good in mechanical property, conductive property and flame-retardant property.

The invention discloses a vehicle composite steering system and a mode switching control method thereof, and the method comprises the steps: establishing a relation between an ideal yaw velocity and asteering wheel angle, and solving the ideal yaw velocity; establishing a composite steering system and a whole vehicle dynamic model; and designing a control method of the steering system in each steering mode according to the ideal yaw velocity, the composite steering system and the whole vehicle kinetic model. The advantages of a steer-by-wire system and a differential steering system are combined, the ideal yaw velocity is designed and tracked, and the yaw stability of the vehicle is improved.

The invention belongs to the technical field of road engineering materials, and particularly relates to a method for preparing prefabricated kerbs through asphalt pavement surface layer milling material regeneration. According to the following technical scheme, the prefabricated kerbs are prepared from the following components in parts by weight: 30-50 parts of an RAP material (0-5 mm), 30-40 parts of an RAP material (5-10 mm), 20-30 parts of an RAP material (10-20 mm), 0.2-0.55 part of a regenerative agent, 3.5-8 parts of a fiber enhancer, 4-6 parts of a stabilizer, 2-5 parts of new asphalt,8-15 parts of rubber powder, 20-25 parts of a corrosion-resistant agent, 2.5-3 parts of a waterproof and anti-oil agent, 5.2-8 parts of rosin and 5-10 parts of inorganic nano-ceramic heat-insulation coating. The prefabricated kerbs prepared in the mode that waste milling materials are subjected to special processes such as crushing, screening, recombinant regeneration, prefabrication and curing are extremely compact, high in strength, durable, long in service life, and high in oxidation resistance, low-temperature cracking resistance and corrosion (salt corrosion) prevention capacity.

The invention discloses a steer-by-wire system stability control method. The method comprises the following steps that a four-wheel steer-by-wire system and a whole vehicle model are established; thefour-wheel cornering stiffness, the lateral vehicle speed and the yaw velocity are estimated by adopting an extended Kalman filter algorithm with limited gain; a sliding mode control algorithm is adopted to design an ideal yaw velocity and ideal lateral vehicle speed tracking controller, and stability control over the steer-by-wire system is completed. According to the method, the tire cornering stiffness of the four-wheel steering system and the relevant feedback state of the vehicle are estimated in real time, a robust tracking control strategy is designed to track the lateral vehicle speedand the yaw velocity of the vehicle, and the stability and the driving safety of the whole vehicle are improved while a driver instruction is responded.

The invention discloses a detection method for the adhesion rate and the phagocytosis rate of phagocytes on bacterial. According to the detection method, phagocytes are divided into a control group, a treatment group and a untreated group, the control group cells are treated with trypan blue and cytochalasin D, the treatment group cells are treated with trypan blue or cytochalasin D, the untreated group cells are not treated, bacteria are labeled with CFDA-SE, and after the bacterial and cells interact, the adhesion rate and the phagocytosis rate of the phagocytes are detected through flow cytometry. According to the present invention, the adhesion rate and the phagocytosis rate of the phagocytes on pathogenic bacteria can be rapidly and accurately detected, and the whole experimental process does not exceed 3 h; the required operation steps after the interaction of the pathogenic bacteria and the phagocytes are less, such that the detection of the large batch sample can be performed; the required reagent is less and the price is economical so as to substantially reduce the scientific research cost; and the detection method is suitable for the adherently growing phagocytes and the difficult-detected phagocytes having the suspending growing state, and broaden the research idea to a certain extent.

The invention discloses an A-pi-D-pi-A type BODIPY small molecular photovoltaic material and a preparation method and application thereof, and belongs to the technical field of organic synthesis. According to the compound, carbazole, fluorene, indolocarbazole, phenothiazine, triphenylamine, benzodithiophene, indacenedithiophene, dithienopyrrole, cyclopentadithiophene and the like are used as electron donating units (D), and X-group and Y-group substituted BODIPY units (A) are bridged through different numbers of thiophene (pi) respectively. HOMO energy levels and band gaps of molecules are cooperatively regulated and controlled by utilizing different numbers of D units and pi bridges, so that the photoelectric conversion efficiency of the material is improved. The compound has the potential of becoming a high-efficiency and high-current organic small-molecule photovoltaic material, and broadens the research thought for developing BODIPY photovoltaic materials with different molecular skeletons.

The invention discloses a benzothiadiazole unit-based A-pi-A'-pi-A type acceptor photovoltaic material, and a preparation method and an application thereof, and belongs to the field of organic photoelectric materials. The material adopts benzothiadiazole as a nucleus, adopts a nitro group and a 4-fluorophenyl group as end groups, and adopts a 2-cyano-styryl group as a pi connecting bond; and alkyl-modified thienyl groups are introduced to two sides of the benzothiadiazole unit in order to improve the solubility of the material, extend the conjugation length of a molecule and enhance the intramolecular charge transfer ability. The organic small molecular material obtains Jsc exceeding 1.0 mA cm<-2>, and has large redshifts being 34 nm and 38 nm respectively. The PCE of the material is increased from 0.1% to 1.0% and increases 10 times after replacing the nitro end group (M1) with the 4-fluorophenyl group (M2) due to the M2 having high Jsc and Voc, so the M2 material has higher potentialto be a high-efficiency non-fullerene small molecular acceptor photovoltaic material than the M1.

Belonging to the field of photoelectric materials, the invention discloses a benzothiadiazole asymmetric organic small molecular photovoltaic material, a preparation method and application thereof. The D-Pi-A-A' type asymmetric molecule involved in the invention adopts benzothiadiazole as unit A, takes triphenylamine as unit D, employs phenyl, styryl, 2-cyano-styryl and phenylacetylene as Pi connecting bond respectively, and uses biscyanovinyl as the A' end group. In addition, different bridged bonds and the A' end group synergistically strengthen the ICT effect and reduce the HOMO energy level of the molecule. The 2-cyano-styryl connecting bond broadens the molecular absorption range. The introduction of phenyl or 2-cyano-styryl can reduce the HOMO energy level of the molecule, and Voc can exceed 1.0V. The PCE of the synthetic material is up to 2.43%. The compound has a clear structure, good solubility and film-forming properties, and has the potential of serving as an efficient asymmetric organic small molecular donor photovoltaic material.

The invention relates to a method for detecting starch degrading microorganisms in a tobacco leaf. The method for detecting the starch degrading microorganisms in the tobacco leaf comprises the specific steps of sample collection, sample treatment, sample dilution, cell separation, ultrasonic treatment, calibration and tracing of the starch degrading microorganisms, microscopic observation and the like. The method can be applied to tobacco leaves of different varieties, different positions and different maturity levels for flue-cured tobacco; the information of strain degrading flora in the tea leaf in an in-situ state is obtained; the labor intensity is decreased more greatly; the cost is lower; the operation process is simple and convenient; an operator does not need to be specially trained; a special requirement on a sampling position does not exist; the experimental result is accurate and errorless; relevant data can be quickly provided for a technician. Meanwhile, the method is also helpful to the technician to ascertain the specific fermentation and aroma enhancement mechanisms of the tobacco leaf, so as to better guide practices, explore and perfect the treatment technical measure and condition of the tobacco leaf, broaden and innovate the search thoughts of the fermentation technique of the tobacco leaf and positively carry out the search of a new field relevant to the method for detecting the starch degrading microorganisms in the tobacco leaf.

The invention relates to a method for preparing a polycarboxylate superplasticizer with a main chain modified isocyanate grafted positive ion side chain and belongs to the field of the superplasticizer. The method comprises the following steps: by taking unsaturated carboxylic acid and unsaturated amide monomer as reactants, acquiring a polycarboxylic acid-amide main chain through free radical polymerization; further modifying the amide group on the main chain as isocyanate group; by taking unsaturated positive ion quaternary ammonium salt monomer as the reactant, performing free radical polymerization under an oxidation-reduction initiating system composed of high-price cerate and alcohol, thereby acquiring an end hydroxy positive ion side chain; performing grafting reaction on polycarboxylic acid main chain containing isocyanate with the end hydroxy positive ion side chain and the polyethylene glycol compound. The method has the advantages of simple and controllable process, low cost, energy-saving effect, high efficiency, polyethylene glycol and no pollution; the main chain modified isocyanate is grafted with the positive ion side chain and the polyether side chain according to a molecular structure design method; the double modification for main chain and side chain of molecule is successfully realized; the water-reducing collapse-protecting property and the capacity of restraining clay side effect are better than those of the common polycarboxylate superplasticizer.

The invention discloses a preparation method and application of a silicon-based MEMS gas sensor chip. The preparation method comprises the following steps: S1, depositing insulating materials on an upper surface of a silicon wafer substrate to obtain a cantilever supporting layer; S2, performing wafer-level metal deposition on a surface of the cantilever supporting layer to form a heating electrode; S3, depositing an insulating layer on a surface of the heating electrode in a wafer level mode; S4, preparing a corrosion window and a test electrode on a surface of the insulating layer in the wafer level mode; S5, depositing a bonding layer on a surface of the test electrode in the wafer level mode; S6, integrally preparing a gas-sensitive film on a surface of the bonding layer; S7, introducing corrosive liquid into the corrosion window, and carrying out wet etching on the silicon wafer substrate below an area where the gas-sensitive film is located to obtain a gas sensor wafer; and S8, performing scribing treatment on the gas sensor wafer to obtain a silicon-based MEMS gas sensor chip, wherein the bonding layer and the gas-sensitive film are made of the same materials. The gas sensor chip obtained by the invention has excellent gas-sensitive properties such as high stability and high sensitivity, and compatible manufacturing of a silicon-based gas-sensitive film is realized.

A method for preparing a macro-monomer synthesized polycarboxylate water reducer through alcoholysis of alkenyl-acyl chloride belongs to the field of water reducers. The method comprises the following steps: firstly polymerizing a cationic chain, and then reacting with the alkenyl-acyl chloride, thus obtaining a macro-monomer; then carrying out copolymerization on the macro-monomer and a carboxylic acid micro-monomer, i.e., polymerizing under an oxidization-reduction initiating system formed by high-valence cerate and alcohols by taking an unsaturated cationic quaternary ammonium salt monomer as a reactant, thus obtaining a terminal hydroxyl cationic long chain; then respectively enabling the terminal hydroxyl cationic long chain and polyethylene glycol monomothyl ether to react with the alkenyl-acyl chloride respectively, thus preparing macro-monomers with different structures; then carrying out free radical polymerization on the macro-monomers and unsaturated carboxylic acid micro-monomers, thus obtaining the macro-monomer composite polycarboxylate water reducer. According to the method disclosed by the invention, the macro-monomers with different structures and functions are successfully synthesized through ways of polymerizing the cationic chain and respectively reacting with the alkenyl-acyl chloride by combining polyether, and a novel comb-structure polycarboxylate water reducer which takes a polycarboxyl acid as a main chain and the cationic long chain and the polyether as polybasic side chains can be finally obtained. A reaction technology is simple and easy, and multiple excellent effects of retaining slump through reducing water, resisting clay, and the like are realized.

The invention discloses a benzotriazole small-organic-molecule photovoltaic material and a preparation method and application thereof and belongs to the field of photoelectric materials. The compound uses benzotriazole as a nucleus, uses triphenylamine as an end group and uses thiophene, a single bond, C = C or C=C as connecting keys respectively. After fluorine atoms having higher electronegativity are introduced to the benzotriazole, the initial oxidation potential of the material is improved. The triphenylamine is used as the end group, so that the electron donating capability of molecules is enhanced, the hole-transporting performance is improved, and the solubility of the compound is improved in coordination with an alkyl group on the benzotriazole. The C = C is introduced in the molecules, so that the absorption range of the compound is widened. The single bond or the C = C is introduced so that the HOMO energy level can be effectively reduced. The VOC of a device is improved through coordination of the single bond or the C = C introduced in the molecules and the monofluoro benzotriazole. The PCE of the synthetic material is above 1.70%, the highest PCE is up to 4.77%, and the benzotriazole small-organic-molecule photovoltaic material has the potential of serving as an efficient small-organic-molecule photovoltaic donor material.

The invention discloses a cross-organization business process model mining and compliance checking method and system. The method comprises the following steps: 1) acquiring a cross-organization business process event log; 2) mining a business process model of each organization and a cooperation mode existing between any two organizations by using the obtained cross-organization business process event logs; 3) integrating the mined business process models of different organizations and cooperation modes between the organizations to obtain a global cross-organization business process model; 4) performing compliance check on the business process model of each organization and the cooperation mode between the organizations in the mined cross-organization business process event log; and 5) performing compliance check on the global cross-organization business process model and obtaining a conclusion. The cross-organization business process models in various scenes can be mined, and the problem that the mined cross-organization business process models cannot be effectively measured through an existing compliance checking method is solved.

The invention belongs to the technical field of road engineering materials, and concretely relates to a method for preparing a hexagonal slope protection block by regenerating asphalt pavement surfacemilling materials. The prefabricated hexagonal slope protection block is prepared from, by weight, 18-22 parts of an RAP material (0-5 mm), 12-14 parts of an RAP material (5-10 mm), 7-9 parts of an RAP material (10-20 mm), 0.2-0.25 part of a regenerant, 1-2 parts of a fiber reinforcing agent, 1.6-2 parts of a stabilizer, 0.6-0.8 part of new asphalt, 2-4 parts of gum powder, 3-5 parts of an anticorrosive agent, 1.4-1.6 parts of a water and oil resistant agent, 0.8-1.2 part of rosin and 1-3 parts of an inorganic nano-ceramic heat insulation coating. The prefabricated hexagonal slope protectionblock prepared by crushing, screening, rebuilding, prefabricating and curing the waste milling material has the advantages of high compactness, high strength, durableness, long service life, and strong ability to resist oxidation, low temperature crack and erosion (salt erosion).