60results about How to "Flexible modulation" patented technology

The invention discloses a processing method and a process device of cellulose industrial biomass wastes, and the method comprises the following steps: feeding raw materials into a drying system continuously, supplying heat by high-temperature flue gas from the combustion of volatile matter precipitated in pyrolysis and carbonization so as to dry the raw materials; allowing the dried raw materials to enter a carbonization reactor for pyrolysis and carbonization, delivering the intermediate products of pyrolysis and carbonization to a riser reactor, preparing porous carbon-based adsorption functional material (namely active carbon), syngas (or called biomass gas), or steam under the action of an oxidative medium and an activator, or an oxidative medium and an gasifying agent, or an oxidative medium. The steam required by the system is prepared by the activated or gasified high-temperature gas-solid products through heat exchange, which can increase the energy recovery efficiency of the process; the process adopts a continuous running mode with complete self-heating, and realizes the high-value conversion of cellulose industrial biomass wastes.

A fiber Chirped Pulse Amplification (CPA) laser system includes a fiber mode-locking oscillator for generating a laser for projecting to a fiber stretcher for stretching a pulse width of the laser. The fiber CPA laser system further includes a multistage amplifier for amplifying the laser and a high-order dispersion compensating compressor for compensating high order dispersions and compressing the pulse width of the laser. The high-order dispersion compensating compressor further includes a pair of gratings coupled with a pair of prisms, a grating pair engraved on the surfaces of a pair of prisms, a chirped grating pair and a phase modulator consists of a grating and a deformable mirror, for generating a negative group velocity dispersion (GVD) and a negative third order dispersion (TOD) for the laser.

The invention provides a pulse time synchronization system for quantum enhanced laser detection. The system comprises a laser main light source (1), a delay unit (2), a time synchronization monitoring detector (3), a digital phase-locked unit (4), and a synchronous control unit (5). According to the system, the delay unit (2) is guided to carry out high precision optical pulse delay through the feedback signal of the digital phase-locked unit (4), a problem that the satisfaction of the time synchronization and maintenance of a pulse coherent characteristic at the same time in quantum enhanced laser detection by pump light, signal light and local-oscillator light are needed can be solved, the delay unit (2) adopts fiber or Fabry-Perot interference cavity to carry out fixed time delay modulation, the size is small, and the degree of integration is high.

The invention discloses a general binary migration carrier modulation method of a satellite navigation system signal, which comprises the steps of changing the time occupied by a traditional modulation waveform chip binary value (plus 1 or minus 1) by utilizing a variable parameter Rho based on binary offset carrier modulation so as to realize the flexible modulation of the splitting degree of the existing binary offset carrier modulation mainlobe and the existing binary offset carrier modulation sidelobe and simultaneously realize the code tracking performance, the anti-interference performance, the anti-multipath performance and the compatibility of the signal.

The invention discloses a synthesis method of a B acid center-setting and distribution-adjustable mordenite (MOR) molecular sieve as well as a product and application of the molecular sieve. Particularly, the invention relates to a method for synthesizing an MOR molecular sieve, the acid center of which is preferentially set in a 'side pocket' of an eight-membered ring communicated with a twelve-membered ring hole, with or without the existence of inorganic alkali. The method comprises the step of introducing an additional reagent and a randomly selected fluorination reagent which are of different structures and charge densities into synthetic gel, and the B acid center of the obtained MOR is preferentially set in the 'side pocket' of the eight-membered ring communicated with the twelve-membered ring hole. A catalyst product obtained through the method is excellent in adsorption and catalysis properties. The synthesis method disclosed by the invention is simple, has a wide industrial application prospect, and is particularly applied to dimethyl ether carbonylation reaction catalysts.

A PLL circuit is described. The PLL circuit includes: a signal generator; and a spread spectrum modulator coupled to the signal generator, where the spread spectrum modulator receives a control voltage as an input and provides a spread spectrum control voltage to the signal generator in response to the control voltage. In one embodiment, the spread spectrum modulator includes at least one selector, where the at least one selector selects a plurality of voltage levels that correspond to a spread mode and percentage of spread for the spread spectrum modulator.

The invention relates to the technical field of semiconductors, in particular to a continuous pulse generator. The continuous pulse generator comprises a drive-changeable inverter and an inverter chain which is formed by an even number of inverter units which are in series connection. The drive-changeable inverter comprises inverter units, a P-channel metal oxide semiconductor (PMOS) array and an N-channel metal oxide semiconductor (NMOS) array. An overturning and discriminating electrical level of the continuous pulse generator can be adjusted through adjusting the number of metal oxide semiconductor (MOS) transistors in the PMOS array and the NMOS array, the MOS transistors are joined up with an input end of each inverter unit in the drive-changeable inverter, and therefore the purpose of controlling and adjusting a duty ratio of output pulse signals is achieved. The continuous pulse generator is simple in circuit structure, compatible with the existing complementary metal-oxide-semiconductor transistor (CMOS) semiconductor technology, and flexible and convenient to adjust pulse width to achieve optimal transmission signal bandwidths. The continuous pulse generator can provide impulse sequences with controllable frequencies and different pulse widths and adjust transmission signal bandwidths to obtain high-quality signals, thereby enabling a modulation system to be more flexible. The continuous pulse generator can be widely used in the field of wireless communication.

The invention relates to a core-shell structured nano monocrystal ZSM-5@Silicalite-1 molecular sieve and a preparation method thereof. According to the preparation method, a nano ZSM-5 molecular sieveis used as a core phase, and the grain size is 50 to 800 nm; a nano Silicalite-1 molecular sieve is used as a shell phase, and a shell layer is 5 to 100 nm in thickness; after the outer surface of the core-phase ZSM-5 molecular sieve is pretreated with a weakly acidic solution, the core-phase ZSM-5 molecular sieve is subjected to hydrothermal crystallization in a shell-layer molecular sieve growth solution system, so that the nano monocrystal ZSM-5@Silicalite-1 molecular sieve containing a compact shell layer is prepared. The molecular sieve provided by the invention has the characteristics of a continuous porous channel, low diffusion resistance, high integration mechanical intensity and high selectivity; furthermore, the molecular sieve can be effectively applied to a catalytic crackinggasoline hydrogenation modification process, and has excellent catalysis performance on aspects of aromatics shape-selective disproportionation, shape-selective alkylation, shape-selective isomerization, catalytic cracking gasoline hydrogenation modification and the like.

The invention provides a focusing and levelling device and method. A spatial light modulator is adopted to ensure that a measurement light spot can be modulated according to the thickness of a substrate, the size of the measurement light spot is changed, and the phenomenon of ghosting of the detection light spot is prevented from generating, thus the detection precision is improved, and further the focusing and levelling device has high adaptability to the substrate; the focusing and levelling device is flexible in modulation and convenient and reliable.

A PLL circuit is described. The PLL circuit includes: a signal generator; and a spread spectrum modulator coupled to the signal generator, where the spread spectrum modulator receives a control voltage as an input and provides a spread spectrum control voltage to the signal generator in response to the control voltage. In one embodiment, the spread spectrum modulator includes at least one selector, where the at least one selector selects a plurality of voltage levels that correspond to a spread mode and percentage of spread for the spread spectrum modulator.

The invention discloses a 3D-HEVC interframe information hiding method based on visual perception, including two parts of information embedment and information extraction. In the information embedment process, the visual perception feature of the human eye is taken into consideration, the stereoscopic image is obtained according to the stereoscopic image significant model, and the stereoscopic significant image is binarized into the significant block and the non-significant block with the combination of the otsu threshold; for different regions, the secret information is used to correct the coding quantization parameter according to different modulation rules; and then the corrected coding quantization parameter is used to code the coding tree unit to complete the embedment of secret information. In the information extraction part, the participation of the original video is not required, transmission of any edge information is not required, and the secret information can be blindly extracted. The advantages are that the method combines the visual perception feature of the human eye and selects the P frame and the B frame as the embedded frame, which effectively prevents reduction in the subjective quality of the stereo video; the computational complexity is low and the influence on the bit rate is small; and the blind extraction is achieved.

A fiber Chirped Pulse Amplification (CPA) laser system includes a fiber mode-locking oscillator for generating a laser for projecting to a fiber stretcher for stretching a pulse width of the laser. The fiber CPA laser system further includes a multistage amplifier for amplifying the laser and a high-order dispersion compensating compressor for compensating high order dispersions and compressing the pulse width of the laser. The high-order dispersion compensating compressor further includes a pair of gratings coupled with a pair of prisms, a grating pair engraved on the surfaces of a pair of prisms, a chirped grating pair and a phase modulator consists of a grating and a deformable mirror, for generating a negative group velocity dispersion (GVD) and a negative third order dispersion (TOD) for the laser.

The invention discloses a method for preparing a double-exchange biasing field type spin valve and belongs to the technical field of magnetic materials and components. The method comprises the steps of: preparing the double-exchange biasing field type spin valve by adopting the thin film deposition technology under the action of an external magnetic field, wherein the sizes of the exchange biasing fields are different, and the directions are the same; measuring the sizes of two exchange biasing fields through a vibrating sample magnetometer; and finally, applying external magnetic fields with the same size and opposite directions between the two exchange biasing fields, and applying pulse current on a ferromagnetic layer film surface having a lower exchange biasing field along the direction of the exchange biasing field simultaneously. The size and direction of the lower exchange biasing field can be changed according to the difference between the applied external magnetic fields H and the size of the pulse current. Therefore, different double-exchange biasing field type spin valves are obtained. By using the spin transfer effect to modulate the size and direction of the lower exchange biasing field in the double-exchange biasing field type spin valve, the preparation steps are simplified and the application flexibility of the double-exchange biasing field type spin valve is improved.

The invention discloses a synthetic method of a MgSAPO-31 molecular sieve, relating to a synthetic method of a molecular sieve, and aiming to solve the problems that only a molecular sieve with an acid site can be synthesized at present by adopting the conventional silicon source and aluminum source and mixed crystals are easily formed in a crystallized product. The synthetic method comprises the steps of 1, dispersing a NaX molecular sieve into a magnesium nitrate solution or magnesium acetate solution to perform ion exchange, and controlling the exchange frequency and exchange time to obtain a Mg / NaX molecular sieve; 2, mixing phosphoric acid, pseudo-boehmite, the Mg / NaX molecular sieve, di-n-butylamine and deionized water, and stirring to obtain an initial gel; 3, putting the initial gel into a crystallization kettle, performing crystallization at 170-190 DEG C, performing centrifugal separation, washing and drying on a crystallization product, and then roasting to obtain a molecular sieve. According to the synthetic method disclosed by the invention, a molecular sieve framework contains two acid sites of Si and Mg with different strengths at the same time, the preparation purity is high, and the molecular sieve can be used as a catalyst applied to the fields of petrochemical industry and the like.

A high-power frequency doubling single-frequency laser generating device for phase modulation and demodulation comprises a single-frequency laser (1), a first phase modulator (2), an optical fiber amplifier (4), a spatial isolator (5), a frequency doubling device (6) and a second phase modulator (7) which are connected in sequence, and further comprises a signal generator (3). The device is characterized in that the signal generator (3) generates two periodic signals with the same shape and frequency, the first phase modulator (2) and the second phase modulator (7) are driven respectively, thephase difference of the two periodic signals is npi-delta phi, wherein n is an odd number, delta phi is phase delay generated by laser transmission amplification between the second phase modulator (7) and the first phase modulator (2), and the modulation depth of the second phase modulator (7) is twice that of the first phase modulator (2). Single-frequency fundamental frequency light is generated through single-frequency fundamental frequency light phase modulation, a laser SBS threshold value is improved, high-power multi-single-frequency frequency doubling light is obtained after amplification and frequency doubling, the frequency doubling light is subjected to phase demodulation, and high-power single-frequency frequency doubling light is obtained. According to the scheme, the single-frequency laser has the characteristic of frequency doubling line width before phase modulation, has the characteristics of simple and flexible structure, good light beam quality and the like, provides a new scheme for frequency doubling of the high-power single-frequency laser, and has an important practical value.

The invention relates to a demultiplexing device based on the metasurface of a V-shaped optical antenna and a working method of the demultiplexing device. The device comprises a substrate and a plurality of periodically-arranged V-shaped antenna unit groups arranged on the substrate; the plurality of the V-shaped antenna unit groups are arranged in sequence along an X axis and are arranged in parallel along a Y axis; each V-shaped antenna unit group comprises six V-shaped antennas; a phase difference between every two adjacent V-shaped antennas is pi / 3; and phase coverage of 0 to 2 pi is achieved. The demultiplexing device can realize different angle deflection for multi-wavelength light of a specific waveband. Based on a generalized Snell law, in a working waveband of 1,450-1,650nm, the arm length and an included angle of the V-shaped antennas are modulated to introduce a phase sudden change gradient at an interface, so that abnormal refraction is achieved. Through the interaction between incident light and a micro-nano antenna array at the interface, linear polarization conversion transmission phase shift in the range of 0-2 pi can be flexibly modulated, and chromatic dispersionat different angles can be performed for light with different wavelengths.

The invention relates to a modular DC transformer based on a discrete switched capacitor. The modular DC transformer comprises one or more DSC- DAB sub-modules, input ends of the plurality of DSC-DABsub-modules are connected in series or in parallel, and output ends are connected in series or parallel. The DSC-DAB sub-modules comprise discrete switched capacitor modules, medium / high voltage DC conversion modules, high-frequency isolation conversion modules and low-voltage DC conversion modules which are connected in order. According to the invention, the modular design is adopted, the voltagechange speed of a high-frequency link is reduced, the overcurrent caused by the parasitic capacitance of the transformer is avoided, at the same time, the volume of the DC transformer is reduced, theproduction cost of the transformer is reduced, and the work such as installation, commissioning and transportation is facilitated.

The invention provides a modulation type Mach-Zehnder interferometer based on a thermo-optic effect. A light source 1 serves as an incident end and is connected with an optical fiber taper 3-1 through a single-mode optical fiber 2-1; a section of biased double-core single-hole optical fiber 5 is welded between biased double-core optical fibers 4-1 and 4-2, and the two ends of each biased double-core optical fiber are connected with the optical fiber tapers 3-1 and an optical fiber taper 3-2 respectively, so that the Mach-Zehnder interferometer is formed; the other end of the optical fiber taper 3-2 is connected to a spectrograph 7; and an air hole of the biased double-core single-hole optical fiber is filled with liquid with a high thermo-optical coefficient, the biased double-core single-hole optical fiber is placed on a controllable electric heating device 6, and an electrode array on the controllable electric heating device is connected with a power supply control end 9 through a lead wire 8. The modulation type Mach-Zehnder interferometer applies a voltage to an electric heating sheet to cause the change of an effective refractive index of a fiber core close to the air hole in the optical fiber, so that the optical path difference is generated between the two fiber cores, and the modulation of output light is realized. The modulation type Mach-Zehnder interferometer has important application in the field of optical fiber sensing.

The invention provides a catalyst for co-production of methyl acetate and acetone from dimethyl ether and a preparation method and application thereof. The catalyst is prepared by performing alkali treatment modification on a molecular sieve sample containing an MOR and / or EMT structure and then performing treatment under the atmosphere of pyridine and / or a pyridine substitute. Raw material gas containing dimethyl ether and carbon monoxide passes through the fixed bed reactor filled with the catalyst sample and reacts at the reaction temperature of 170-380 DEG C, the reaction pressure of 0.5-20.0 MPa and the gas volume space velocity of 500-10000 h <-1 >, and acetone is produced. The flexibility and the economy of the device for producing methyl acetate through carbonylation of dimethyl ether can be improved, and acetone production can get rid of the defects that traditional industrial production excessively depends on petroleum resources, the production process is complex, corrosion exists and the like. The whole process is simple, high in practicability and extremely high in industrial application background.

The invention discloses a method and device for image formation, scattering component calculation and reconstruction of X-ray images. The method for image formation of the X-ray image comprises the following steps: collecting X-rays passing through a collimator and an imaging object in sequence to form an X-ray image group, wherein the collection is performed when the collimator moves along a first direction, and the X-ray image group is a group of X-ray images collected at different moments of the movement of the collimator; extracting sub-region images of each X-ray image in the X-ray image group; and combining the sub-region images along the first direction to form modulated X-ray images. In implementation of the technical scheme of the invention, the collimator is used for performing flexible modulation on X-ray intensity distribution, extra hardware is not increased, scattering components in the X-ray images are calculated, and finally the scattering quantity of the X-ray images is reduced.

A frequency-doubled laser generating device comprises a single-frequency laser, a phase modulator, a laser amplifier, a spatial isolator and a frequency doubling device which are connected in sequence, and further comprises a signal generator which generates radio frequency or pseudo-random signals and is used for driving the phase modulator and modulating single-frequency laser with the output phase amplitude being Npi, after being amplified by the laser amplifier, the single-frequency laser is emitted into the frequency doubling device through the spatial isolator, single-frequency or narrow-linewidth frequency doubling light with the laser phase modulation amplitude of 2Npi is obtained, and N is an odd number. The phase modulator can realize phase modulation in a wider wavelength range, and meanwhile, high-power low-frequency fundamental frequency light obtained by the laser amplifier is subjected to frequency doubling to obtain single-frequency or narrow-linewidth frequency doubling light, so that the structure has the advantages of being simple, flexible in design and the like; a new technical scheme is provided for high-power and high-stability single-frequency or narrow-linewidth laser frequency doubling, and high practical value and application prospects are achieved.

The invention discloses a processing method and a process device of cellulose industrial biomass wastes, and the method comprises the following steps: feeding raw materials into a drying system continuously, supplying heat by high-temperature flue gas from the combustion of volatile matter precipitated in pyrolysis and carbonization so as to dry the raw materials; allowing the dried raw materials to enter a carbonization reactor for pyrolysis and carbonization, delivering the intermediate products of pyrolysis and carbonization to a riser reactor, preparing porous carbon-based adsorption functional material (namely active carbon), syngas (or called biomass gas), or steam under the action of an oxidative medium and an activator, or an oxidative medium and an gasifying agent, or an oxidative medium. The steam required by the system is prepared by the activated or gasified high-temperature gas-solid products through heat exchange, which can increase the energy recovery efficiency of the process; the process adopts a continuous running mode with complete self-heating, and realizes the high-value conversion of cellulose industrial biomass wastes.

The invention discloses a speech synthesis method for generating a new tone. The method comprises the following steps of training a deep neural network by using a plurality of sound base data to forma first synthesis model; respectively training the first synthesis model by using the plurality of sound base data to form a plurality of second synthesis models corresponding to the plurality of sound base data; reasoning a first output parameter by using the first synthesis model; reasoning a plurality of second output parameters corresponding to the second synthesis models by using the plurality of second synthesis models to form a second output parameter group; performing weighted stacking on the second output parameter group to form acoustic parameters; and reconstructing the acoustic parameters by a vocoder to form synthesis speech. The method provided by the invention has the advantages that the synthesis of the speech with the new tone can be realized under the condition of not making a new sound base; and the tone of the synthesized speech can be flexibly modulated according to a synthesis model corresponding to the existing sound producer sound base data, the synthesis efficiency is not obviously changed, and the problems of complicated work procedure, long period and high cost of the manufacturing of the new sound producer sound base are solved.

The invention provides a magnetic flux memory type magnetic gear composite motor, and relates to the field of permanent magnet synchronous motor, in particular to the field of a magnetic gear composite motor with adjustable magnetic fluxes. Thus, a problem of poor magnet adjusting effects in traditional magnetic gear composite motor air gap magnetic field is solved. According to the invention, anouter stator direct-current exciting winding winds outer stator magnetic steel; by imposing direct current pulses on the outer stator direct-current exciting winding, the magnetization strength of theouter stator magnetic steel is changed; and by adjusting a magnet adjusting ring of a cup-type rotor and the air gap magnetic fluxes between inner and outer stators, effective adjustment of the air gap magnetic fluxes of the motor is achieved. The motor is mainly applied in direct driving field of electric vehicles and the like.

The invention discloses an environment self-adaptive 'laser sheath' auxiliary laser communication device and a method based on wavefront phase modulation. The invention belongs to the technical fieldof free space laser communication. The ultrashort pulse light is filamented in the atmosphere to generate laser sheath auxiliary signal light to pass through turbulence; according to the device, the wavefront phase modulator is used for tuning the wavefront phase of the pulse light and simultaneously controlling the variable-magnification beam expander, the zoom lens module and the ultra-short pulse laser to realize tunable laser sheath spatial distribution so as to achieve the real-time and optimal auxiliary effect on the signal light. According to the device and the method, a complex nonlinear process of laser filamentation and a time-varying link environment are subjected to black box treatment; the ultra-short pulse light beam is tuned, the defects of difficult control of laser sheathspace distribution and large auxiliary performance fluctuation are overcome, the advantages of strong turbulence resistance and environment self-adaptation are achieved, long-distance and high-stability auxiliary laser communication can be realized, and the rapid application of the emerging technology of laser sheath auxiliary optical communication is facilitated.

The invention discloses a method for generating a multi-focus self-focusing light beam with adjustable focus characteristics. The method comprises the following steps: constructing a self-focusing light beam through a caustics method; superposing wavefronts corresponding to the multiple groups of self-focusing light beams; coding the complex amplitude distribution of the wavefront into a pure phase form; the phase distribution obtained by loading the spatial light modulator is used for modulating an incident light field; and performing Fourier transform on the modulated light field by using a lens. The device has the beneficial effects that a light field can be converged to a plurality of focuses along different tracks after being modulated once, and regulation and control on the number and the position of the focuses and the relative intensity between the focuses can be realized at the same time, so that more flexible control on the energy of the light field is realized. According to the invention, the complex wavefront required for generating the multi-focus self-focusing light beam is coded into a pure phase form by using a biphase method, so that the requirement on light field regulation and control equipment is reduced.

The invention provides a data modulation method and device, a data demodulation method and device, a service node, a terminal and a medium. The data modulation method comprises the steps of: determining a modulation parameter A according to a data modulation mode; and modulating data according to a target constellation point symbol, wherein the target constellation point symbol is a product of A and X, and X is an initial constellation point symbol corresponding to the modulation mode.

The invention discloses a tunable optical filter based on a winding micro disc structure. The invented device comprises a partially winding micro disc resonant cavity and an optical input or output straight waveguide connected to the micro disc resonant cavity notch. The optical transmission straight waveguides are disposed respectively at the two sides of the micro disc resonant cavity bottom, and the other ends of the two optical transmission straight waveguides are connected to two waveguide reflection mirrors which are connected with each other by an orienting coupling structure or an MMI coupling structure. An electrode modulating area is disposed on the optical transmission straight waveguide or on the micro disc resonant cavity. The winding micro disc resonant cavity and the triangular waveguide mirror plane are combined organically with each other to implement wavelength quick selection. Devices such as a wave filter, an optical switch capable of selecting wavelength, a laser, a power divider and a modulator are implemented by adding electro-optic modulation or structure extension additionally. Different modulation area facilitates flexible modulation and implements different function requirement. The invented device is provided with a simple structure, a small size, and is easy to be integrated or extended.

The invention provides a high-frequency oscillation suppression method and device for a new energy storage system. The method comprises the following steps: acquiring a grid-connected point AC voltage of the new energy storage system in a VSC-HVDC system and an output current of the VSC-HVDC system; determining a modulation voltage of a sending end converter station in the VSC-HVDC system; and suppressing high-frequency oscillation of the new energy storage system. The function of the line between the sending end converter station and the new energy storage system is considered, the situation that the phase difference between the impedance of the WFVSC and the impedance of the new energy storage system is too large is avoided, the high-frequency oscillation of the new energy storage system is suppressed to the maximum extent, the suppression effect is good, and the system operation stability when the new energy storage system is connected to the main network through the VSC-HVDC can be obviously improved. High-frequency oscillation suppression of the new energy storage system is realized on the basis of the modulation voltage of the sending-end converter station, the method and the device are irrelevant to a specific modulation mode, adjustment is more flexible, and the method and the device are suitable for high-frequency oscillation suppression of the new energy storage system in a VSC-HVDC system including SVM and SPWM.