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48results about How to "Clear understanding of technical means" patented technology

High-resolution and low-spurious-frequency synthesizer of UHF (Ultrahigh Frequency) frequency band

InactiveCN101834604ASolve the technical difficulties that it is difficult to filter the required frequency through the analog filterSolve the accuracy problemPulse automatic controlLow-pass filterQuadrature mixer
The invention relates to a frequency synthesizer, in particular to a high-resolution and low-spurious-frequency synthesizer of a UHF (Ultrahigh Frequency) frequency band, comprising a phase detector, a phase-locked loop, a DDS frequency synthesizer and a quadrature mixer, wherein the phase-locked loop comprises a low-pass filter and a voltage controlled oscillator; the DDS frequency synthesizer is a double-frequency output DDS frequency synthesizer; the phase detector is used for receiving reference signals and dividing the signals, the low-pass filter is connected with the phase detector to supply voltage control signals, a voltage control oscillator is connected with the low-pass filter to supply output signals, the quadrature mixer is coupled among the voltage control oscillator, the DDS frequency synthesizer and the phase detector, and the DDS frequency synthesizer is connected between a reference signal and the quadrature mixer. The frequency synthesizer greatly increases the frequency resolution (0.0024Hz), inhibits stray, reduces the stabilization time and can especially obtain the same high-resolution frequency signals in arbitrary frequency bands.
Owner:BEIJING BBEF SCI & TECH

End processing method of multi-strand excitation wire

The invention relates to a wire end processing method, in particular to an end processing method of a multi-strand excitation wire. The method comprises the following steps of: (1) peeling end insulation parts; (2) fixing end core wires into a whole; (3) cutting the end face into an inclined plane; (4) welding a copper pipe and the core wire end face; (5) connecting welding pieces; (6) inspecting; and (7) insulating a neck part. The method improves the reliability of conductive connection of the welding pieces and the multi-strand excitation wire.
Owner:BEIJING 761 COMM RADAR

Lens and light source device with the same

The invention provides a lens and a light source device with the lens; wherein, the lens which is used for receiving light rays given out by a luminous semiconductor component comprises a bottom surface, a top surface and a side surface; the bottom surface is opposite to the luminous semiconductor component to receive light rays; the top surface is reversed to the bottom surface and comprises a rough surface structure which causes part of light rays which go through the bottom surface and is incident to the top surface instead of going to the right above of the top surface; the side surface extends to the peripheral part of the bottom surface form the peripheral part of the top surface and the light rays which go through the bottom surface and are incident to the side surface are irradiated out of the lens; the shape of the lens is gradually enlarged from the junction of the top surface and the side surface to the direction of the bottom surface; a projection of the section at the upper part of the lens falls into the scope of the section of the lower part of the lens. The lens and the light source device can cause intensity of light rays given out by the luminous semiconductor component to be distributed evenly and therefore light fields with even distribution of the light intensity can be obtained on an exit aperture.
Owner:BRIGHT LED ELECTRONICS CORP

Squelch control method of automatic gain power amplifier chain and circuit

The invention relates to a squelch control circuit, in particular to a squelch control method of an automatic gain power amplifier chain and a circuit. The method comprises the following steps of: (1) sampling an input signal of nth amplifier in the automatic gain power amplifying chain; (2) detecting the input signal into a direct-current voltage signal; (3) carrying out negative feedback amplification on the direct-current voltage signal; (4) comparing the direct-current voltage signal through the negative feedback amplification with a direct-current voltage with preset squelch ratio; and (5) if the direct-current voltage signal is more than or equal to the direct-current voltage with the preset squelch ratio, controlling the power amplifying chain to disconnect; if the direct-current voltage signal is less than the direct-current voltage with the preset squelch ratio, controlling the power amplifying chain to connect. In the invention, a direct-current control signal sent to an electric control attenuator is used as a squelch signal, and a detection circuit does not need to be arranged independently; and since the negative feedback amplification is carried out on the direct-current control signal, a characteristic curve of a detector is justly overturned, so that the problems that a judgment window area of the existing squelch control circuit is too narrow and non-linear are overcome, and the squelch sensitivity is greatly improved.
Owner:BEIJING BBEF SCI & TECH

Method for processing signals between analog exciter and power amplifier and interface circuit

The invention relates to a transmitter, in particular relating to a method for processing signals between an analog exciter and a power amplifier used for a long wave / super long wave transmitter and an interface circuit thereof. The method comprises the following steps: dividing sine voltage signals of the analog exciter into 2n numbered constant amplitude square-wave voltage, successively performing differential operation to obtain a series of front edge pulses arranged in order, acquiring pulse delay time of quasi-monspaced square-wave superposition closure time by calculating, delaying the front edge pulses, feeding the front edge pulses and the delayed front end pulses in a drive pulse generator to start up and shut down driving voltages of n numbered step square-wave inverters, and conducting the n numbered square-wave inverters to obtain sinusoid with different amplitudes. The invention solves the problems of pulse loss and incapability of normal work of a system when an inverted rear edge pulse sequence method is used.
Owner:BEIJING BBEF SCI & TECH

Electronic tube plate electrode blocking capacitor

The invention relates to a capacitor and particularly relates to an electronic tube plate electrode blocking capacitor which is used for an electronic tube plate electrode of high-frequency high-power transmission equipment. The electronic tube plate electrode blocking capacitor comprises a polytetrafluoroethylene barrel, inner and outer polar plates arranged on the inner and outer surfaces of the polytetrafluoroethylene barrel, a connection corner and a connection plate which are welded on the polar plate on the outer surface, an annular contact reed which is electrically connected with the electronic tube plate electrode and is arranged on the inner polar plate, and a cooling air pipe arranged under the polytetrafluoroethylene barrel, wherein the inner polar plate is a thin-wall metal inner barrel, and the thin-wall metal inner barrel used as the inner polar plate is combined with the polytetrafluoroethylene barrel through interference fit; the outer polar plate is a thin-wall metal outer barrel; and the thin-wall metal outer barrel used as the outer polar plate is combined with the polytetrafluoroethylene barrel through interference fit, and circular-arc-shaped corona rings are arranged at the two ends of the thin-wall metal outer barrel used as the outer polar plate. With the adoption of the electronic tube plate electrode blocking capacitor, the problem that the connection corner and a connection plate lamp are welded on the polar plates so that the insulation performance of part of the polytetrafluoroethylene barrel is reduced is solved.
Owner:周晓

Pulp production process technology of biolysis (HYH7 black rot) combined with mechanical process

The invention relates to a paper pulp production technique which combines biolysis with machine work and has no used water discharging. It includes smashing the raw material, laying crack, biolysis, high-pressure pressing bursting, mediating, jordaning, pulp screening, and shoving. The used water can be used circularly to realize zero discharging. The paper pulp raw material includes straw, ditch reed, bamboo etc. The production technique has the advantages of no pollution, saving water, and low material consumption etc. And its cost is 40% of the chemical process. It is green high and new-technology industries with high economic benefit used to make food wrap paper, medicine wrap paper, and various papers.
Owner:张健

Aloe milk powder and making method

The present invention relates to milk product and is especially one kind milk powder containing aloe and its production process. The aloe milk powder is produced with aloe gel, fresh milk, animal protein, vegetable fat powder, malt dextrin and sugar in certain proportion. The production process includes cleaning, sterilizing, peeling, slicing, homogenizing and colloid milling aloe to obtain aloe gel; mixing milk, animal protein, vegetable fat powder, malt dextrin and sugar and concentrating the mixture to produce compounded milk; mixing the compounded milk and aloe gel; homogenizing, sterilizing, spray drying, sieving and packing to obtain aloe milk powder. The aloe milk powder thus produced contains rich amino acids, organic acids, minerals, aloe polysaccharide and other nutrients; has the functions of raising body's immunity, resisting senility, resisting tumor, etc. and is suitable for old people and other valetudinarians to eat.
Owner:BEIJING WEIR MILK IND

Remote keying method and device for stepper motor driver based on can communication

The invention relates to the remote key control of a stepping motor driver, and particularly relates to a remote keying method and a remote keying device of the stepping motor driver based on CAN (Controller Area Network) communication. The device comprises a key, a control end signal processor, a CAN communication network and a controlled end signal processor, wherein the key is connected with the control end signal processor, the control end signal processor processes key signals as 'pressed down' or ' lifted up' code signals and sends the 'pressed down' or ' lifted up' code signals to the CAN communication network, and the controlled end signal processor receives the 'press down' or 'lifted up' code signals sent from the CAN communication network, decodes, synthesizes and restores the 'press down' or 'lifted up' code signals as the key signals, generates control signals and sends the control signals to the stepping motor driver. The remote keying device of the stepping motor driverbased on CAN communication successfully achieves manual remote keying of an antenna of a large-power long-wavelength signal transmitter, realizes a control distance as long as several kilometers, totally satisfies the demand of the manual remote keying of the antenna regulation of the large-power long-wavelength signal transmitter, ensures stable application in a large-power high-frequency field high-interference environment, and has good effect.
Owner:BEIJING BBEF SCI & TECH

Power sensor frequency characteristic test compensation device and method thereof

The invention relates to a device and a method for testing and compensating, in particular to a device and a method for testing and compensating frequency characteristics of a power sensor. The device comprises a frequency characteristic tester and a power sensor testing and compensating small box. Resistance and capacitance jacks of a debugging and compensating network and diode jacks X5 and X6 are arranged on a panel of the testing and compensating small box. A radio frequency connector is arranged on the small box near the side surfaces of the jacks of the debugging and compensating network. The radio frequency connector is connected with a high-frequency signal output end of the frequency characteristic tester. A direct current output connector is arranged on a side surface near the diode jacks. The direct current output connector is connected with an input end of a frequency characteristic tester. An input end of the debugging and compensating network is connected with the radio frequency connector. An output end of the debugging and compensating network is connected with the diode jack X5. The diode jack X6 is connected with the direct current output connector. According to the device and the method disclosed by the invention, a high-efficiency solution for designing and debugging the power sensor is provided; the debugging problem is reduced; and properties of products are improved.
Owner:BEIJING BBEF SCI & TECH

Light emitting device

The invention relates to a light emitting device comprising a light emitting module, a first conducting plate and a heat radiating plate set. The light emitting module comprises a conducting circuit consisting of one metal sheet and a plurality of light emitting diodes, the plurality of light emitting diodes are arranged on the conducting circuit and are connected in series and parallel by the conducting circuit, and the light emitting module can be locked between the first conducting plate and the heat radiating plate set and can be externally connected with an outside power source by contacting with a conducting area on the first conducting plate. Because the construction of the light emitting module and the locking combination between the light emitting module and the first conducting plate do not need a process of welding with a circuit board or reflow soldering, the manufacturing process is simpler, and the impaction and the breakage of the light emitting diode, caused by high temperature generated during the welding or reflow soldering process, can be avoided, so that it is beneficial to the batch production; in addition, the bottom of the light emitting diode is in forced, direct and efficient contact with a heat conducting layer on the heat radiating plate set by strong mechanical pressure, the heat conducting layer thins, the head transfer effect is better, and it is beneficial to the radiation of the light emitting diode, thus the normal service life of the light emitting diode can be maintained.
Owner:BRIGHT LED ELECTRONICS CORP

PSM digital circulation controller based on FPGA (Field Programmable Gate Array) and control method thereof

ActiveCN101931385AImprove performance indicatorsImprove Signal Processing AccuracyPulse modulationShift registerPerformance index
The invention relates to a PSM digital circulation controller, in particular to a PSM digital circulation controller based on an FPGA (Field Programmable Gate Array) and a control method thereof. The controller comprises an audio signal processing unit, a control unit and an M bit shift register, wherein the audio signal processing unit, the control unit and the M bit shift register are built from the FPGA, the audio signal processing unit equally divides audio signals according to the time and converts the audio signals into direct current superposed audio signals to be sent to the control unit, the output of the control unit is connected with the M bit shift register, and the control unit controls the M bit shift register according to a time sequence and a direct current superposed audio signal amount to send closing and opening signals of a control switch module of 1 or 0 according to sequences of closing and opening firstly as well as opening and closing firstly. The PSM digital circulation controller is realized by adopting the FPGA through a software, has high signal processing accuracy and is realized by using a software algorithm to replace hardware, thereby enhancing performance indexes of a launcher, miniaturizing a hardware system, enhancing the system reliability and being beneficial to upgrading and networking the system.
Owner:BEIJING BBEF SCI & TECH

Fat-reducing traditional Chinese medicinal herb preparation drink

InactiveCN102058126AWith fat lossSignificant fat lossFood preparationHerbal preparationsMedicinal herbs
The invention relates to a fat-reducing traditional Chinese medicinal herb preparation drink. The drink is prepared from the following natural medicinal materials which are screened continuously and clinically in an ancient formula of traditional Chinese medical science for a long term in part by weight: 20 to 50 parts of cassia seed, 30 to 60 parts of cannabis fruit, 20 to 50 parts of perilla fruit, 15 to 45 parts of common burreed rhizome, 15 to 45 parts of zedoary, 10 to 40 parts of morning glory seed, 10 to 40 parts of mung bean, 10 to 40 parts of sward, 5 to 35 parts of honey, 10 to 40 parts of xylitol and the balance of purified water. The fat-reducing Chinese medicinal herb preparation drink has the effects of fat reduction, constipation prevention, endocrine conditioning, beautification and the like.
Owner:刘旭

Resin cementing material for oil-gas well as well as preparation method and application thereof

The invention particularly relates to a resin cementing material for an oil-gas well and a preparation method and application thereof, and belongs to the technical field of oil-gas well engineering. The resin cementing material is prepared from bisphenol F epoxy resin and a curing agent, wherein the bisphenol F epoxy resin is prepared from at least one of the following components: epoxy resin NPEF-170, epoxy resin NPEF-175, epoxy resin NPEF-185 and epoxy resin NPEF-198; and the curing agent comprises at least one of an amine curing agent and an anhydride curing agent. An amino group or a carboxyl group in the amine curing agent or the anhydride curing agent opens a ring of an epoxy group in the epoxy resin in a high temperature environment in an oil-gas well; a curing agent molecule is taken as a center to form a four-arm star-shaped structure, in the microscopic level, linear epoxy resin molecules are crosslinked to form a three-dimensional network structure, in the macroscopic level,a liquid resin cementing material is solidified into a solid state with certain mechanical strength after a period of time in an underground high-temperature environment, and the cementing and packing effects are achieved.
Owner:BC P INC CHINA NAT PETROLEUM CORP +2

PSM digital circulation controller based on FPGA (Field Programmable Gate Array) and control method thereof

The invention relates to a PSM digital circulation controller, in particular to a PSM digital circulation controller based on an FPGA (Field Programmable Gate Array) and a control method thereof. The controller comprises an audio signal processing unit, a control unit and an M bit shift register, wherein the audio signal processing unit, the control unit and the M bit shift register are built from the FPGA, the audio signal processing unit equally divides audio signals according to the time and converts the audio signals into direct current superposed audio signals to be sent to the control unit, the output of the control unit is connected with the M bit shift register, and the control unit controls the M bit shift register according to a time sequence and a direct current superposed audio signal amount to send closing and opening signals of a control switch module of 1 or 0 according to sequences of closing and opening firstly as well as opening and closing firstly. The PSM digital circulation controller is realized by adopting the FPGA through a software, has high signal processing accuracy and is realized by using a software algorithm to replace hardware, thereby enhancing performance indexes of a launcher, miniaturizing a hardware system, enhancing the system reliability and being beneficial to upgrading and networking the system.
Owner:BEIJING BBEF SCI & TECH

Hydraulic pump control double-motor transmission system

The invention provides a hydraulic pump control double-motor transmission system which comprises a hydraulic pump, an oil supplementing pump, a hydraulic pump speed regulating mechanism, a hydraulic pump electromagnetic valve, a hydraulic motor electromagnetic valve, a hydraulic flow regulating electromagnetic valve, a one-way valve, a throttling valve, a hydraulic motor speed regulating mechanism, a front hydraulic motor, a rear hydraulic motor, a gearbox and a rear axle. The oil supplementing pump is connected with the hydraulic pump, the hydraulic pump is connected with the hydraulic pump speed regulating mechanism, the hydraulic pump speed regulating mechanism is connected with the front hydraulic motor and the rear hydraulic motor, the front hydraulic motor is connected with the gearbox, and the rear hydraulic motor is connected with the rear axle. The transmission mode that the hydraulic pump is connected with the two variable displacement motors in parallel is adopted in the system, the rotating speed range of the double motors is adjusted under the combined action of the hydraulic pump speed adjusting mechanism, the front hydraulic motor speed adjusting mechanism and the rear hydraulic motor speed adjusting mechanism, and the characteristics of being large in stepless speed change range, wide in torque change range and the like are achieved. And the defects of narrow speed change and torque range of a hydraulic system when the existing engineering vehicle works are overcome.
Owner:SHIHEZI UNIVERSITY
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