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Front wheel and rear wheel drive steering control system of automobile

InactiveCN101618733ARealize active steeringImprove lateral dynamicsSteering linkagesAutomatic steering controlDriver/operatorSteering control
The invention relates to a front wheel and rear wheel drive steering control system of an automobile in the technical field of automobile engineering. Steering wheel steering angle sensors are respectively connected with a drive turning electronic control unit; one end of each steering wheel steering angle sensor is connected with a steering wheel, and the other end of each steering wheel steering angle sensor is connected with a front wheel steering motor servo control unit; the front wheel steering motor servo control unit is respectively connected with a front wheel steering angle displacement sensor and a front wheel steering execution mechanism; a rear wheel steering motor servo control unit is respectively connected with a rear wheel steering angle displacement sensor and a rear wheel steering execution mechanism; the front wheel steering execution mechanism is connected with a front wheel, and the rear wheel steering execution mechanism is connected with a rear wheel. The invention combines front wheel drive steering and rear wheel drive steering, improves the lateral dynamic performance of the automobile, the driving characteristics of a driver and the operating stability of the automobile, changes a steering angle of the front wheel and the rear wheel in real time according to the drive working condition and a running parameter of the automobile and ensures that the automobile response follows the output response of a reference automobile model.
Owner:SHANGHAI JIAO TONG UNIV

Carbon fiber modified non-solvent polyurethane surface layer resin for sports shoe leather, as well as preparation method and application of carbon fiber modified non-solvent polyurethane surface layer resin

The invention belongs to the field of synthetic leather, and provides carbon fiber modified non-solvent polyurethane surface layer resin for sports shoe leather. The resin is formed by mixing a component A and a component B according to mass percent being 2:1 to 1:2, wherein the component A comprises 5 to 15 parts of aliphatic diisocyanate, 50 to 60 parts of low polymer dihydric alcohol, 10 to 20 parts of organosilicone polyhydric alcohol, 3 to 10 parts of micromolecule dihydric alcohol, 0.5 to 5 parts of micromolecule trihydric alcohol, 0.1 to 1.5 parts of a catalyst, 0.5 to 2.5 parts of a light/heat stabilizer, 0.02 to 0.5 part of a flatting agent, 0.01 to 0.2 part of a defoamer, 0.1 to 0.5 part of a dehydrator, and 0.5 to 5.0 parts of carbon fiber; the component B comprises 40 to 50 parts of aliphatic diisocyanate, 0 to 10 parts of triisocyanate, 35 to 50 parts of polytetrahydrofuran dihydric alcohol, 0.5 to 5 parts of micromolecule dihydric alcohol, 0 to 2 parts of micromolecule trihydric alcohol, and 0.5 to 1.0 part of a light/heat stabilizer. The invention further provides a preparation method and application of the resin. The tangential breaking strength of carbon fiber modified resin coating can reach 130kN/m or above; for non-solvent sports shoe leather prepared through the method, the peeling strength can reach 90N/3 cm or above and the hydrolysis resistance can reach 10 weeks or above.
Owner:HEFEI ANLI POLYURETHANE NEW MATERIAL

Domestic sewage treatment process and apparatus

The invention discloses a domestic sewage treatment process, which comprises the following steps that: sewage enters an anaerobic pond to carry out a degrading reaction after being filtered, outlet water automatically flows into a middle adjusting pond, and outlet water of an artificial wetland pond part flows back to the middle adjusting pond; water of the middle adjusting pond enter oxygen lack environment, high-concentration mud in the sewage is discharged to the anaerobic pond, and NO2-NO3-N ions in circulating water are subjected to denitrification under the oxygen lack environment; the outer water after an oxidation reaction automatically flows into an aerobiont reaction tower; and the outlet water of the aerobiont reaction tower automatically flows into the artificial wetland pond of which the inside is provided with emergent aquatic plants, floating plants, fish and shrimps. The invention also discloses domestic sewage treatment equipment. On the basis of the prior domestic sewage treatment mode, the method sufficiently utilizes the low cost of an anaerobic wetland method and the high efficiency of an aerobiont method, and greatly reduces the cost of the water treatment. The whole flow does not needed to add medicines, and reduces the cost. Power consumption only comes from a lifting pump of the middle adjusting pond, and energy consumption is greatly saved.
Owner:江苏百纳环境工程有限公司

LED photocuring non-solvent type photosensitive transfer printing adhesive for cover plate glass substrate and preparation method thereof

The invention discloses LED photocuring non-solvent type photosensitive transfer printing adhesive for a cover plate glass substrate. The photosensitive transfer adhesive comprises aliphatic polyurethane acrylate, an acrylate reactive diluent, a photoinitiator, an acrylic auxiliary and a silane coupling agent. The LED photocuring non-solvent type photosensitive transfer printing adhesive for the cover plate glass substrate is free of solvents and environmentally friendly, integrates advantages of the transfer printing technology and advantages of the photosensitive technology, and can be particularly used for development through a pure water neutral developing solution. The LED photocuring non-solvent type photosensitive transfer printing adhesive for the cover plate glass substrate has excellent physical performance, resistant to solvents, resistant to cold and hot impact and good in adhesion with the substrate after being cured. The adhesive force of an adhesive layer and the substrate is larger than 4B and environmental pollution is little especially after a boiling test. The problem that existing UV adhesive is poor in adhesion on cover plate glass and not resistant to boiling or solvents is solved, industrial requirements are met, production cost of enterprises is reduced, and benefits are brought to the enterprises.
Owner:SUZHOU BETELY POLYMER MATERIALS CO LTD

Preparation method of hydrogenated bisphenol A epoxy resin

The invention relates to a preparation method of hydrogenated bisphenol A epoxy resin. The preparation method comprises the steps of raw material pre-treatment, ring-opening addition and etherifying, ring-closing epoxidation, product post-treatment and the like. The specific steps are as follows: based on hydrogenated bisphenol A and epoxy chloropropane as raw materials, adding solvent; performing ring-opening etherifying by taking Lewis acid as a catalyst to produce chlorohydrin ether immediate; recovering part of the solvent, adding alkali solution and performing ring-closing dechlorinating reaction; carrying out post-treatment steps such as neutralizing, extracting, water washing, vacuum desolventizing to obtain hydrogenated bisphenol A epoxy resin, wherein the epoxide equivalent of the product is 210-240g/eq; the hydrolyzable chlorine content is not more than 1000ppm; the inorganic chloride content is not more than 10ppm; the viscosity is 2000-5000mPas at 25 DEG C; and the volatile component content is not more than 0.1%. The preparation method of hydrogenated bisphenol A epoxy resin has the advantages of stable process, low material and energy consumption, few by-products, simple water-washing and separating operation and high product yield, therefore, the preparation method can be applied in large-scale industrial production.
Owner:CHINA PETROLEUM & CHEM CORP

Automatic intermittent feeding stirring apparatus

The invention belongs to the technical field of mixers with rotary stirring devices in fixed containers, and particularly discloses automatic intermittent feeding stirring apparatus. The apparatus comprises a stirring box, a motor fixed on the upper end surface of the stirring box, a driving shaft fixedly connected with the motor, a hollow material storage plate which is provided with teeth on theside surface, fixedly connected with the driving shaft and positioned inside the stirring box, blades which are fixedly connected with the driving shaft and positioned inside the stirring box, a bevel gear meshed with the material storage plate and rotatably connected with the side wall of the stirring box, and a sliding sleeve slidably connected with the driving shaft. A stirring plate is fixedly connected to the sliding sleeve; a rotating ring is slidably connected with the sliding sleeve; a connecting rod is hinged to the rotating ring; the other end of the connecting rod is hinged to thebevel gear; second through holes are formed in the lower end surface of the material storage plate; baffle plates for sealing the second through holes are arranged on the second through holes, a spring is fixedly connected on the upper end surface of each baffle plate; and the other end of each spring is fixedly connected with the upper wall of the material storage plate. The apparatus provided bythe invention is mainly used for the synthesis and preparation of chemical reagents.
Owner:徐州天骋智能科技有限公司

Automated production device for styrene-acrylic emulsion mixing and automated control method of automated production device

The invention discloses an automated production device for styrene-acrylic emulsion mixing and an automated control method of the automated production device. The automated production device comprises a PLC (programmable logic control) system, a polymerization reaction kettle, an overhead acrylate tank, an overhead styrene tank and an overhead initiator tank, wherein a weight sensor is arranged at the bottom of each overhead tank and is connected with the PLC system; a control valve is arranged on each of an acrylate feeding pipe, a styrene feeding pipe and an initiator feeding pipe and is connected with the PLC system; a temperature sensor is arranged on the polymerization reaction kettle and is connected with the PLC system; a control valve is arranged on each of a heated steam pipe and a cooling water pipe and is connected with the PLC system. The automated control method comprises the step that the PLC system automatically adjusts an acrylate feeding control valve, a styrene feeding control valve, an initiator feeding control valve, a heated steam control valve and a cooling water control valve to control the feeding amount and the feeding speed of acrylate solution, styrene solution and an initiator solution and the temperature of the polymerization reaction kettle. The feeding amount and the feeding speed of materials and the flow of heated steam and cooling water are adjusted according to the change of reaction temperature by using the PLC system, so that the temperature of polymerization reaction is stable, and the production safety and the product quality are ensured.
Owner:湖北尚助化学有限公司

DoS (Denial of Service) and DDoS (Distributed Denial of service) attack resisting method of DNS recursive server

The invention relates to a DoS and DDoS attack resisting method and device of a DNS recursive server. The method comprises monitoring the current concurrent recursive request quantity of the recursive server in real time, and when the recursive request quantity is continuously larger than the designated multiples of the maximum concurrent recursive query total volume that the recursive service can process within a specific time period, starting the response mechanism of a common DNS cache for prefetching and limiting the concurrent recursive query quantity when the specific time period times out. According to the DoS and DDoS attack resisting method of the DNS recursive server, by monitoring the current concurrent recursive request quantity of the recursive server in real time and starting the response mechanism at the appropriate time, the cache hit rate of DNS query can be improved, queries issued by the recursive server to other DNSs can be inhibited, so that server resources and network bandwidth which are occupied during DoS and DDoS attacks can be reduced, so that normal response to analysis requests of legitimate users can be guaranteed to the maximum extent, and safe operation of a DNS system can be maintained.
Owner:INTERNET DOMAIN NAME SYST BEIJING ENG RES CENT +1

Etherified C4 superimposition esterification cogeneration method of isooctane and sec-butyl acetate

The invention discloses an etherified C4 superimposition esterification cogeneration method of isooctane and sec-butyl acetate. The etherified C4 superimposition esterification cogeneration method of the isooctane and the sec-butyl acetate comprises the following steps: (1), passing an etherified C4 raw material through a reactor filled with a solid acidic catalyst, performing superimposition reaction under reaction conditions that the reaction temperature is 60-90 DEG C and the pressure is 0.8-1.6Mpa, and distilling a superimposition reaction product to obtain the refined C4 raw material on the top of a distillation tower and obtain C8 olefin, with iso-octene as a main part, at the bottom of the distillation tower; and (2) mixing and preheating the refined C4 raw material with acetic acid, passing the mixture through an esterification reactor filled with an esterified heteropoly acid catalyst, and reacting under reaction conditions that the temperature is 70-110 DEG C and the pressure is 1.0-1.4Mpa to obtain the sec-butyl acetate. The superimposition reaction is high in selectivity; the procurement index of the C4 raw material of the sec-butyl acetate is lowered; the supply of the raw material is ensured; and the generated C8 olefin can be used as a high-octane gasoline component, thus improving the economic benefit.
Owner:WEIFANG YIXING CHEM TECH
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