179results about How to "Meet demanding requirements" patented technology

The invention relates to high-temperature-resistant heat-insulation paint and a preparation method thereof and belongs to the technical field of materials. The paint is used for heat-insulation protection of spacecrafts. The paint comprises, by weight, 25-35 parts of epoxide resin modified organic silicon resin containing nano particles, 10-20 parts of polybenzimidazole, 5-10 parts of high-temperature-resistant inorganic nonmetal compounds, 20-30 parts of high-temperature-resistant fillers, 1-3 parts of curing agents and 5-27 parts of solvents. The paint is high-temperature resistant, low in thermal conduction, high in shock resistance, low in density, good in bonding capacity, good in comprehensive performance index and capable of guaranteeing strength and rigidity of structural materials under the high temperature condition and meeting harsh requirements of aviation and space fields.

The present invention relates to a process for the manufacture of composite materials having lignocellulosic fibres dispersed in a thermoplastic matrix, while generally maintaining an average fibre length not below 0.2 mm. The process comprises defibrillation of the lignocellulosic fibres using a mixer and at a temperature less than the decomposition temperature of the fibres in order to separate the fibres and generate microfibres, followed by dispersion of the fibres in the thermoplastic matrix by mechanical mixing to get the moldable thermoplastic composition, followed by injection, compression, extrusion or compression injection molding of said composition. The process produces high performance composite materials having a tensile strength not less than about 55 MPa, a flexural strength not less than about 80 MPa, a stiffness not less than about 2 GPa, notched impact strength not less than about 20 J / m, and un-notched impact strength not less than about 100 J / m. The composite materials of the present invention are well-suited for use in automotive, aerospace, electronic, furniture, sports articles, upholstery and other structural applications.

The invention discloses a double-feed antenna based on a metal frame. The antenna comprises a metal frame, a first antenna excitation and a second antenna excitation. A grounding plate used for grounding is arranged on the metal frame, the metal frame is divided into a first frame and a second frame by the grounding plate, the first antenna excitation and the second antenna excitation are located in the first frame and the second frame respectively, the first antenna excitation is coupled with the first frame to form an antenna radiation loop to further form a first antenna. The second antenna excitation is coupled with the second frame to form an antenna radiation loop to further form the second antenna. The antennas of two types are placed in a mobile terminal, the mobile phone space is fully utilized, and the rigor requirement of the smart mobile terminal for antenna space is met.

A secondary mirror support structure of a space optical remote sensor comprises a primary mirror, a secondary mirror, a primary mirror frame, a secondary mirror frame, and secondary mirror support bars, wherein the secondary mirror frame is connected with the primary mirror frame through the secondary mirror support bars, and is parallel to the primary mirror frame; the primary mirror is fixedly mounted on the primary mirror frame; the secondary mirror is fixedly mounted on the secondary mirror frame; the primary mirror is parallel to the secondary mirror; each secondary mirror support bar includes two single plates and a plurality of stiffening ribs; both ends of the single plate are respectively connected with the secondary mirror frame and the primary mirror frame; and the stiffening ribs are arranged between the two single plates of each secondary mirror support bar. The secondary mirror support structure resolves the contradiction of small obstruction ratio, light weight and high rigidity of the support bars. Under the condition of the same obstruction ratio and the same weight, the double-plate structure provided by the invention can greatly improve the rigidity and the thermal stability of the structure in comparison to the conventional single-plate structure; and the specific manifestations are that the fundamental frequency is improved by more than one time, the deformation displacement in the optical axis direction is reduced to about 10% that of the conventional single-plate structure, and the double-plate structure has lower vibration response and less thermal deformation.

The invention relates to a screw cap with a solid lubricating coating. The lubricating coating is 15-30mum thick, and the solid lubricating paint comprises the following ingredients in percentage by weight: 2-12% of molybdenum disulfide, 3-6% of polytetrafluorethylene, 1-7% of graphite, 0-3% of graphene, 12-18% of tungsten disulfide, 8-12% of carbon monofluoride, 16-34% of epoxy resin, 18-29% of nitroresin, and 3-9% of paint additives. The lubricating coating has excellent self-lubricating property, and anti-loosening and anti-occlusion properties. The screw cap with the solid lubricating coating realizes low torque coefficient of 0.1-0.13, and high torque coefficient of 0.14-0.17, thereby meeting the special requirements of automobiles, shipbuilding, power generation and other industries on the screw cap.

The invention provides a rapid double power supply switch device and a working method thereof, relates to a switch used for guaranteeing power supply continuity and the working method, and can effectively solve the problems of contact arcing, electrical energy loss and the like of a conventional switch. The device comprises a frequently-used power supply, a reserve power supply, a load, a circuit breaker I, a circuit breaker II as well as a switch unit I, a switch unit II, a data acquisition module and a total control module, wherein the structure of the switch unit I or the switch unit II comprises a full control type switching element insulated gate bipolar transistor I, a full control type switching element insulated gate bipolar transistor II, an uncontrollable semiconductor device diode I, an uncontrollable semiconductor device diode II, a buffer circuit I, a buffer circuit II, a drive circuit I and a drive circuit II. Serious affects of the problems such as temporary reduction of power supply voltage, short-term voltage interruption and the like on the load are reduced, and safe and stable operation of a power supply system is guaranteed. According to the rapid double power supply switch device and the working method thereof, power supply switch time reaches a millisecond level, seamless switching can be realized, both the rapidity and the transient characteristic are ideal, and strict requirements of a sensitive and critical load on the power supply reliability and electric energy quality are really met.

The invention provides a band-gap reference voltage source design with high gain and a high rejection ratio. A band-gap reference voltage source circuit is composed of an operational amplifier circuit, a starting and biasing circuit, a rejection ratio increasing circuit and the band-gap reference voltage source circuit. A high-gain operational amplifier is adopted for effectively guaranteeing precision and stability of Delta VBE, and offset is reduced by means of multistage amplification; the starting and biasing circuit provides starting voltage and bias for the other circuits, and is closed after the other circuits are started; the rejection ratio increasing circuit increases rejection of the whole circuit on power supply change in a current feedback mode, a locally supplied power supply VDDL is generated, and anti-interference performance of the circuit is enhanced; the band-gap reference voltage source circuit increases the power supply rejection ratio of output voltage by adoption of a current mirror of a self-bias cascade structure, and coordinates with an external circuit to generate reference voltage with stable performance and zero-temperature coefficient. Due to the adoption of the high-gain two-stage operational amplifier, a voltage source isolation technique, an RC compensation network and the current mirror in the self-bias cascade structure, the circuit has low offset voltage, high phase margin, high gain and high rejection ratio, and impact caused by MOS (metal oxide semiconductor) device channel modulation effect is reduced.

The invention relates to an automobile engine fault diagnose and calibrate apparatus, which comprises a control terminal that is connected to a vehicle computer through an OBD interface to interact information with the vehicle computer; an intelligent mobile terminal that is connected to a control end wirelessly; a user sends instructions to the control end and parses the data sent by the control end to diagnose and calibrate the automobile engine. Compared with prior art, a control end in small size for transfer is set on the automobile, and is in cooperation with a portable intelligent mobile terminal, the fault diagnosis and calibrating to the automobile engine can be done. The portability is greatly improved.

The invention discloses an ABS (acrylonitrile butadiene styrene) / PBT (polybutylene terephthalate) / PCTG (polyethylene terephthalate glycol) composite material high in low-temperature toughness and solvent resistance. The shortcoming that ABS resin is poor in solvent resistance is overcome by introduction of PBT resin from the composite material; low-temperature falling ball impact of the composite material is greatly increased by introduction of PCTG resin, and problems about increasing density, solvent resistance performance degradation and the like due to the fact that existing PC is taken as third-component polyester are solved; a bulking agent is applied to the composite material, compatibility of the composite material can be more effectively improved especially by the adoption of an MGD comb-shaped polymer, and low-temperature falling ball toughness of the material is further improved; the composite material is good in solvent resistance, heat resistance and low-temperature falling ball performance, and strict requirements of kitchen appliances, industrial battery shells and the like can be met.