36results about How to "Achieve attenuation" patented technology

The invention relates to a 1/4 rate 4-tap DFE (decision feedback equalizer) for a high-speed serial interface receiving end. The 1/4 rate 4-tap DFE comprises four channels with same structures, and each channel comprises a sampling and holding module, a summator, and two latches, wherein firstly, current input high-speed serial data is sampled by using a pair of 1/4 rate clock signals with a 90-degree phase shift by virtue of the sampling and holding module, so that 1/4 rate data is obtained; the 1/4 rate data decided at the last cycle passes through the two cascaded latches, different deferred data can be obtained; by virtue of combining the deferred data from the four channels, the 4-tap feedback signals can be realized in each channel, and are fed back to the front summator; the summator sums the current 1/4 rate data and four feedback signals to obtain the current decided 1/4 rate data, and then decision feedback is realized; the 1/4 rate 4-tap DFE for the high-speed serial interface receiving end, provided by the invention, samples by using the 1/4 rate clock, and is equipped with 4 tap so as to simultaneously meet the requirements of low power dissipation and strong balance capability.

The invention discloses a BOB (BOB on Board) testing system and a method for automatically calibrating BOB receiving power, and aims to solve the problems of complex operation, low accuracy and high labor cost in the calibration way of the BOB module receiving power. The BOB testing system comprises an upper computer, and an optical line terminal, a BOB module and an integrated authentication system integrated with an optical attenuator which are all connected with the upper computer, and an optical splitter which is synchronously connected with the optical line terminal and the optical attenuator through an optical fiber, wherein the optical splitter is connected with the BOB module through the optical fiber. The BOB testing system is reasonable in design and convenient to operate. Through effective combination of software and hardware, automatic calibration of the BOB receiving power is realized; the automatic degree and calibration accuracy are high; and unnecessary labor cost investment is effectively reduced. Thus, the BOB testing system and the method have very high application values.

The invention provides a distributed type fiber sensing device based on signal reusing perception and demodulation, comprising a laser, a first fiber coupler, a second fiber coupler, a light pulse modulator, a fiber annular device, an optical interface, a balance photoelectric detector, a low noise amplifier, a power divider, a first filter, a second filter, a frequency synthesizer, a mixer, a lowpass filter, a data collecting and processing module, and a computer. The feature that rayleigh scattering signals and Brillouin scattering signals can be generated at the same time is taken into consideration, and by means of the balance photoelectric detector, the rayleigh scattering signals and Brillouin scattering signals of the detection light pulse, generated in the detected fiber are simultaneously converted into radiofrequency signals of the corresponding frequency or frequency range. The rayleigh scattering signals and the Brillouin scattering signals are separated by means of the power divider and a band pass filter. The separated rayleigh scattering signals and the Brillouin scattering signals are accessed to the data collecting and processing module. The attenuation, vibration, and monitoring and displaying of the temperature and strain information of the fiber can be realized.

The present invention is secondary development process of compound Chinese medicine. The secondary development process includes the following steps: 1. selecting old recipe or proved recipe in use for long term, performing the medicine component analysis, recognizing the compound Chinese medicine recipe on the Chinese medicinal material level, and merging and decreasing medicine materials; 2. performing the analysis of medicine material components chemically and with fingerprints, and performing component identification and classifying; 3. proposing new recipe; 4. performing chemical component and fingerprint analysis of the medicine materials in new recipe, and determining the new production process; and 5. designing recipe proportioning by means of homogeneous design scheme, performing relevant pharmacodynaical and pharmacological experiments, and comparing the experiment results to determine the optimal recipe.

The invention provides an integrated optic chip for a three-axis fiber optic gyroscope, in which an input optical waveguide, a first direction coupler, a second direction coupler, a third direction coupler, an optical waveguide attenuator with a Mach-Zehnder structure, an output optical waveguide, a first Y-branch coupler, a second Y-branch coupler, a third Y-branch coupler and a designed metal electrode are integrated. The chip is prepared by low-loss organic polymer optical waveguide material and organic polymer electrooptical material. In comparison with a conventional discrete device optical system, a plurality of waveguide devices with key functions are uniformly integrated on the chip; the multifunctional chip can implement functions, such as modulation, attenuation, splitting, wave combination and the like, on light beams; and the multifunctional chip has the advantages of excellent consistency, high stability, low power, small volume, light weight and the like, and can be used for developing the three-axis fiber optic gyroscope.

The invention relates to a test bench for turbomachine comprising: an installation zone for turbomachine; an active system for attenuating the noise emissions produced by the turbomachine. The activesystem includes an attenuation zone with emitters such as loudspeakers; a first microphone placed downstream of the turbomachine; and a second microphone placed downstream of the attenuation zone. Thesystem reduces the turbomachine waves on the basis of the measurements from the first microphone and from the second microphone. The invention also proposes a method for attenuating the noise emissions from the turbomachine tested in the test bench.

The invention provides a multifunctional distributed optical fiber sensing device, which comprises a laser, a first optical fiber coupler, a second optical fiber coupler, a third optical fiber coupler, a fourth optical fiber coupler, an acousto-optic modulator, an optical fiber circulator, an optical interface, a first photoelectric detector, a second photoelectric detector, a first bandpass filter, a second bandpass filter, a third bandpass filters, a fourth bandpass filter, a first low noise amplifier, a second low noise amplifier, an optical switch, a frequency synthesizer, a mixer, a low pass filter, a dual-channel data acquisition and processing module and a computer. Direct switching control on sensing optical signals and the dual-channel data acquisition and processing module are adopted to process Rayleigh scattering signals and Brillouin scattering signals, multifunctional monitoring and display on attenuation, vibration, temperature and strain information of a measured optical fiber can be realized, the signal extraction and processing efficiency is high, the practicability is better, and commercial development of the device is facilitated.

The invention provides a demagnetizing control method for a double-feeding type wind power generation system to LVRT (Low Voltage Ride Through). A converter on a rotor side is utilized to inject a rotor demagnetizing current component reverse to a stator direct current (space vector) into a rotor loop, so that the accelerating attenuation for a stator direct current magnetic chain is realized. During the control process, only a stator current amplitude value is detected and the stator magnetic chain need not be observed, so that the demagnetizing control method is free from dependence on system parameters. According to a simulated result, the demagnetizing control method provided by the invention is capable of effectively realizing the attenuation for the stator direct current magnetic chain, is free from dependence on the system parameters, and is stronger in robustness.

Device (1) for filtering electromagnetic interference, comprising: - a plurality of electrical conductors (5) mounted in parallel, each conductor (5) comprising a first coil (10) disposed between a first (7) and a second (8) end of the conductor (5), said first coils (10) being coupled magnetically together and exhibiting one and the same first number of turns, said first (7) and second (8) ends of the conductors (5) respectively defining first (7) and second (8) terminals for the device, - a plurality of capacitors (13), each capacitor (13) being mounted between the second end (8) of an electrical conductor (5) and a third terminal (15) of the device, and - an additional circuit (20) comprising a second coil (21) coupled magnetically with the first coils (10) and exhibiting a second number of turns, said circuit (20) furthermore comprising an additional coil (23).

The invention relates to a motion point target image generation device under a laser interference condition. The motion point target image generation device comprises a long-wave infrared laser, a laser aiming diaphragm, a laser attenuation controller and the like. The long-wave infrared laser generates a long-wave infrared interference laser, the long-wave infrared interference laser enters the laser attenuation controller through the laser aiming diaphragm, and the laser attenuation controller adjusts and controls laser energy emitted by the long-wave infrared laser; an infrared laser beam expanding system adjusts a laser beam and simulates an infinite observation process; the infrared point target simulation system simulates a sub-pixel-level or pixel-level target, simulates an infiniteobservation effect and moves along a one-dimensional direction, and a moving speed and a moving range are controlled by the control system; a beam combiner completes scene coupling of the laser beamand the infrared point target simulation system; the infrared camera generates a long-wave infrared image; and an image acquisition system acquires images shot by the infrared camera under the controlof the control system, and completes the generation of a motion point target image sequence under the laser interference condition through continuous work.

The invention relates to a strain with the deletion of wild type Salmonellapullorum virulence genes, and a construction method of the strain. The Salmonellapullorum attenuated mutant strain deltaS6702(SpiA) is Salmonellapullorum CGMCC NO:4377. The strain is obtained by knocking out Salmonellapullorum SpiA genes by using a Red homologous recombination method. The Salmonellapullorum CGMCC NO:4377 can be used as a Salmonellapullorum attenuated candidate live vaccine in application.

The invention provides a lightweight honeycomb wave-absorbing material and a preparation method thereof. The honeycomb wave-absorbing material is obtained by processing a base material doped with carbon fibers into a honeycomb core structure and then carrying out gum dipping molding, and the base material comprises aramid paper or kraft paper. The preparation method comprises the following steps of 1, preparing the honeycomb core by using a base material doped with carbon fibers, wherein the honeycomb core is directly used or subjected to subsequent processing, 2, carrying out gum dipping molding on the honeycomb core, and 3, drying the honeycomb core subjected to gum dipping molding to obtain the honeycomb wave-absorbing material. According to the honeycomb wave-absorbing material disclosed by the invention, paper containing carbon fibers is used as a raw material, and good wave-absorbing performance can be realized by preparing honeycombs; and the wave-absorbing material has the advantages of being excellent in wave-absorbing performance, good in environment resistance, light in weight, flexible, capable of being molded and the like, and can be used for stealth design of some equipment.

The invention belongs to the technical field of silencing and in particular discloses a frequency dividing combined pressure fluctuation attenuation device and method. The device comprises a body, anenergy accumulator and an attenuator, wherein the body is of a hollow structure and is taken as a conveying channel of a to-be-attenuated fluid; the energy accumulator is arranged on the body and is connected to the conveying channel; the attenuator is arranged around the energy accumulator and is also connected to the conveying channel. Therefore, pressure fluctuation of the fluid is attenuated as the energy accumulator and the attenuator are matched. The device can reduce fluid noise and pipeline vibration effectively and is suitable for multi-stage frequency attenuation of pressure fluctuation of various fluids such as water, hydraulic oil and gas.

The invention discloses a cylinder pressure stable control device and a use method and belongs to the technical field of petroleum and seismic exploration equipment. A fixed plate is connected with a cylinder top cover through 12 M16 mounting bolts, the inlet connector of a gas bottle is connected with a gas inlet of a cylinder, the inlet connector of the gas bottle is connected with a second transition connector through a first rubber tube, the second transition connector is mounted on a four-way manifold, an overflow valve, a first transition connector and the second transition connector are respectively mounted on the four-way manifold, a stop valve is connected with the second transition connector, a check valve is connected with a fourth transition connector, a second rubber tube is connected with the check valve through a third transition connector, the outlet of a pressure reducing valve is connected with the second rubber tube, and the gas inlet of the pressure reducing valve is connected with a nitrogen bottle; the parallel connection of the check valve, the gas inlet connector of the cylinder, the stop valve and a gas overflow valve is realized through the four-way manifold. The cylinder pressure stable control device and the use method realize the attenuation of gas under the same pressure state, ensure the consistency on the pressure attenuation of the gas and reduce the gas pressure difference in each time.

The invention discloses an optical module belonging to the technical field of optical fiber communication. The optical module includes a circuit board, a laser arranged on the circuit board and a lens module group arranged on the circuit board. A first fully reflecting surface of the lens module group is close to a light exit surface of the lens module group. The first fully reflecting surface adopts a step structure. A platform of the step structure is parallel to the circuit board. In the invention, the fully reflecting surface of the lens module group is designed as the step structure so that a part of the light can be directly transmitted through the platform part of the step structure and only part of the light is output to an optical fiber through reflecting, thus realizing the attenuation of the light emitted by the laser and making optical power output to the optical fiber less than an upper limit of the optical power required to be output to the optical fiber.

The invention provides a filter material for mouth and nose breathing with the efficacies of eliminating phlegm, stopping coughing and removing toxicity. The filter material comprises the following components in percentage by weight: 15-25% of green tea, 10-20% of lemon slice, 15-25% of gynostemma, 15-25% of liquorice and 15-25% of dendrobium. The filter material for mouth and nose breathing with the efficacies of eliminating phlegm, stopping coughing and removing toxicity, provided by the invention, has the advantages of reducing the smoke toxin of tar and nicotine, eliminating free radicals, carbon monoxide and the like, achieving the efficacies of reducing and removing toxicity and reserving the original savoury and mellow taste of cigarettes. Dust in the air and exhaust gas discharged from factories, mines and vehicles, such as PM (Particulate Matters) 2.5, can be fully filtered by adopting multiple natural plant medicinal components and totally natural plant fibers, and the functions of prevention and health care can be generated by adopting the contained medicinal materials, so that people living in the air with poor quality can achieve the effect of breathing clean air through placing the filter material in a simple air cleaner or a mask.

The present invention specifically relates to an attenuating system and application thereof, in particular to an attenuating virus and its application for attenuating Plasmodium, in particular to the use of an EF1g gene for attenuating Plasmodium. The attenuating system uses a regulatory system to regulate the expression or degradation of the EF1g gene, so as to control the growth of the malaria parasite and achieve attenuating the malaria parasite.

The acoustic reflection suppression device has a channel (17) which is sealed with respect to the interior of the telephone handset, used for connecting the volume on the rear side of the hearing capsule (16) with the outside of the telephone handpiece at a point which is spaced from the ear of the user.

The invention discloses a wireless data processing system based on a DSP (digital signal processor). The wireless data processing system comprises the DSP, an analog-digital converter and a PC, wherein the DSP and the analog-digital converter are interconnected through an FPGA module, the PC is connected with the DSP through a wireless device, a JTAG interface is arranged on the FPGA module, the analog-digital converter is connected with an analog signal conversion device which is connected with sensors I, and a digital signal conversion device is connected on one side of the FPGA module and connected with sensors II; one end of the DSP is connected with a wireless transmission module. The high-speed DSP has higher computing and processing capacity, high-precision, high-speed and multi-channel real-time acquisition of field data can be realized, data transmission is realized through wireless transmission, and the wireless data processing system is applicable to complicated environmentand low in cost and has higher practical value.