Abstract: The present disclosure discloses methods for preparing a composite film based on reduced graphene oxide, cellulose nanocrystals, and cellulose nanofibers. The method mainly includes: 1. preparing a suspension mixed with graphite oxide and cellulose; 2. centrifuging the suspension obtained in the step (1) and washing the sediment after centrifuging with deionized water to obtain a solution, homogenizing the solution in a high-pressure homogenizer to obtain a suspension mixed with graphene oxide, cellulose nanocrystals, and cellulose nanofibers; and 3. drying the suspension mixed with graphene oxide, cellulose nanocrystals, and cellulose nanofibers in a petri dish, and soaking a dried film in a hydroiodic acid solution; and washing the soaked film with deionized water to obtain the composite film of reduced graphene oxide, cellulose nanocrystals, and cellulose nanofibers.

Abstract: The present disclosure discloses methods for preparing a composite film based on reduced graphene oxide, cellulose nanocrystals, and cellulose nanofibers. The method mainly includes: 1. preparing a suspension mixed with graphite oxide and cellulose; 2. centrifuging the suspension obtained in the step (1) and washing the sediment after centrifuging with deionized water to obtain a solution, homogenizing the solution in a high-pressure homogenizer to obtain a suspension mixed with graphene oxide, cellulose nanocrystals, and cellulose nanofibers; and 3. drying the suspension mixed with graphene oxide, cellulose nanocrystals, and cellulose nanofibers in a petri dish, and soaking a dried film in a hydroiodic acid solution; and washing the soaked film with deionized water to obtain the composite film of reduced graphene oxide, cellulose nanocrystals, and cellulose nanofibers.

Abstract: The present disclosure discloses methods for preparing a composite film based on reduced graphene oxide, cellulose nanocrystals, and cellulose nanofibers. The method mainly includes: 1. preparing a suspension mixed with graphite oxide and cellulose; 2. centrifuging the suspension obtained in the step (1) and washing the sediment after centrifuging with deionized water to obtain a solution, homogenizing the solution in a high-pressure homogenizer to obtain a suspension mixed with graphene oxide, cellulose nanocrystals, and cellulose nanofibers; and 3. drying the suspension mixed with graphene oxide, cellulose nanocrystals, and cellulose nanofibers in a petri dish, and soaking a dried film in a hydroiodic acid solution; and washing the soaked film with deionized water to obtain the composite film of reduced graphene oxide, cellulose nanocrystals, and cellulose nanofibers.

Abstract: A sample preparation mould and a sample preparation method for the triaxial test of MSW are provided. In the present invention, the cylindrical main mould comprises two curved steel pieces, and the two sides of each curved steel piece have a stretched connection part; the two curved steel pieces are connected with each other and clamped by two steel clamps; porous stones are arranged at two ends of the cylindrical main mould and fixed separately by a top limiting lantern ring and a bottom lantern ring; the top limiting lantern ring is detachably connected to the top hopper, from which MSW materials are input; the cylindrical main mould is radially constrained in four positions, and the two ends thereof are axially constrained, thereby significantly improving stability during compacting and hence ensuring the axial and radial sizes of the MSW sample.

Abstract: An environmentally-friendly flexible conductive polyurethane (PU) and a preparation method thereof are disclosed. The environmentally-friendly flexible conductive PU is prepared by subjecting a mixture of a component A and a component B in a specified mass ratio to in-situ solvent-free polymerization, where the component A is prepared from a polyol, a T-type chain extender, a diselenide diol, high-conductivity carbon black, a dispersing agent, a catalyst, and a leveling agent, and the component B is prepared from a polyisocyanate, a polyol, a multi-walled carbon nanotube (MWCNT), and a dispersing agent. The PU has a reliable electrically-conductive function, and shows a self-healing function under room temperature or light conditions when damaged, wherein a microphase separation value HBI (0.5 to 3.

Abstract: The present disclosure provides a weaving method of a weft-backed jacquard fabric with color shading effects and belongs to the technical field of weaving methods. In a single-warp and double-weft structure with a weft yarn arrangement ratio of Wefts A and Wefts B of 2:1, by designing two groups of face weaves and backing weaves and corresponding backed points and using a shaded strengthening method, two color shading effects of color shading of the Wefts A and mixed color shading of the Wefts A and the Wefts B of the fabric are achieved. A maximum number of shaded weaves is [R/N(6R?2J2?J1?3)+2], and a grade number of shaded color is less than or equal to the maximum number of the shaded weaves. The designed fabric meets the covering requirements and can be mass produced.

Abstract: A variable synthetic wavelength absolute distance measuring device locked to a dynamic sideband and a method thereof are disclosed. A high-frequency electro-optic phase modulator driven by an adjustable clock source to modulate a single-frequency reference laser to generate laser sidebands with equal frequency intervals. The tunable laser is locked to the fifth-order sideband through an offset frequency locking technology. After locking, the interval frequency of the sideband is determined by the adjustable clock source, namely dynamic sideband. The frequency of the adjustable clock source is dynamically adjusted, the interval frequency of the sideband and the frequency difference between the two lasers will change accordingly. Combined with the multi-wavelength interferometry, the constructed synthetic wavelength is also determined by the adjustable clock source, that is, the variable synthetic wavelength.

Abstract: The present invention discloses a layered electro-magnetic refreshable braille display device and braille reader. The layered electro-magnetic refreshable braille display device includes three layers of braille display modules and a touch panel. Each braille display module includes 5 plates and a plurality of tactile pin driving mechanisms for driving the “up” and “down” of the braille dots. One or more lines of braille cells are arranged on the touch panel. Each line of braille cells displays a plurality of braille characters. A microprocessor is connected to a braille translation module, a voice playing module and an interaction controller respectively, wherein the interaction controller is connected to the braille display device, to form the braille reader. This device can display one or more lines of braille characters by relying on the electro-magnetic principle. It boasts real-time refreshing of the braille, synchronization of braille display and voice playing.

Abstract: The present disclosure discloses an electromagnetic regulating valve with a check function. The valve may effectively regulate the flow in a valve body. Due to different lengths and taper angles of a valve flap group, the flow can be regulated more finely, and a medium can be prevented from backflow by a check function when necessary. Meanwhile, a mesh structure of bases of valve flaps can effectively reduce the instability of flow field motion so as to achieve an effect of rectifying.

Abstract: A method for synthesizing a polymer/pigment hybrid latex through sulfur-free and soap-free in-situ reversible addition-fragmentation chain transfer (RAFT) emulsion copolymerization includes the following: dispersing a pigment with a reactive emulsifier to prepare a pigment dispersion; synthesizing an amphiphilic sulfur-free ?-vinyl-terminated polymethyl methacrylate (PMMA) macromolecular RAFT agent in-situ on a surface of pigment particles through catalytic chain transfer polymerization (CCTP); and adding an acrylate monomer dropwise, allowing in-situ sulfur-free RAFT polymerization on a surface of pigment particles through the RAFT agent, and adjusting a structure and a composition of an encapsulated polymer layer to obtain a series of uniformly encapsulated and stably dispersed polymer/organic pigment hybrid latexes.

Abstract: The disclosure discloses a differential sinusoidal phase modulation laser interferometric nanometer displacement measuring apparatus and method. The beam output from the single-frequency laser is converted into a 45° linearly polarized beam after passing through the polarizer, then projected onto two sets of sinusoidal phase modulation interferometers consisting of the beam splitter, the electro-optic phase modulator, the half wave plate, three pyramid prisms, two polarization beam splitters, thereby forming measurement and reference interference signals which are received by two photodetectors. A high-frequency sinusoidal voltage signal is applied to the electro-optic phase modulator placed in the common reference arm of the two interferometers, thereby modulating the interference signal into a high-frequency AC signal. By detecting the difference between the phase change amounts of the two interference signals when the measured object moves, the measured displacement can be obtained.

Abstract: The present disclosure discloses an electromagnetic regulating valve with a check function. The valve may effectively regulate the flow in a valve body. Due to different lengths and taper angles of a valve flap group, the flow can be regulated more finely, and a medium can be prevented from backflow by a check function when necessary. Meanwhile, a mesh structure of bases of valve flaps can effectively reduce the instability of flow field motion so as to achieve an effect of rectifying.

Abstract: A reference laser beam locked to a femtosecond optical frequency comb is modulated through a high frequency electro-optic phase modulator, and laser sidebands with equal intervals are generated. Beat frequency is performed on the sixth-order sideband and the frequency sweeping laser beam, a beat signal and a frequency sweeping signal source are down-mixed to generate a difference frequency signal, and the difference frequency signal is locked to a reference clock through a digital phase detector and a PID controller. The frequency sweeping laser beam is locked to reference laser beam with a dynamic offset frequency under the closed loop control, and sinusoidal frequency sweeping is simultaneously performed together with the frequency sweeping signal source. The locked laser beam is used for absolute distance measurement, and a distance to be measured is obtained according to the synthetic wavelength transition theory.

Abstract: A water injection method for a PID control-based adaptive intelligent water injection system is provided. The system includes a water injection portion, a power portion, a control portion, and a measurement and transmission portion. The water injection portion includes a hydrogenation reactor, heat exchangers, air coolers, and a separation tank. The power portion includes a motor and a water pump. The control portion includes a console and a bus. Temperature, pressure and flow velocity transmitters are additionally arranged at each of inlet and outlet pipes of various heat exchangers, and water injection points are disposed. Temperature, pressure and flow velocity signals of the inlet and outlet pipes of heat exchange devices are monitored, and the console performs error analysis on the three signals and uses a PID control algorithm to control the adjustment valve to alter the valve opening degree to adjust the water injection amount in real time.

Abstract: The disclosure discloses a phase delay extraction and compensation method in a PGC phase demodulation technology. The sinusoidal phase modulation interference signal is converted into a digital interference signal by an analog-to-digital converter after amplification and filtering, and the digital interference signal is subjected to orthogonal downmixing of first-order, second-order, and fourth-order harmonics simultaneously to obtain three pairs of orthogonal harmonic amplitude signals.

Abstract: The disclosure discloses a differential sinusoidal phase modulation laser interferometric nanometer displacement measuring apparatus and method. The beam output from the single-frequency laser is converted into a 45° linearly polarized beam after passing through the polarizer, then projected onto two sets of sinusoidal phase modulation interferometers consisting of the beam splitter, the electro-optic phase modulator, the half wave plate, three pyramid prisms, two polarization beam splitters, thereby forming measurement and reference interference signals which are received by two photodetectors. A high-frequency sinusoidal voltage signal is applied to the electro-optic phase modulator placed in the common reference arm of the two interferometers, thereby modulating the interference signal into a high-frequency AC signal. By detecting the difference between the phase change amounts of the two interference signals when the measured object moves, the measured displacement can be obtained.

Abstract: A reference laser beam locked to a femtosecond optical frequency comb is modulated through a high frequency electro-optic phase modulator, and laser sidebands with equal intervals are generated. Beat frequency is performed on the sixth-order sideband and the frequency sweeping laser beam, a beat signal and a frequency sweeping signal source are down-mixed to generate a difference frequency signal, and the difference frequency signal is locked to a reference clock through a digital phase detector and a PID controller. The frequency sweeping laser beam is locked to reference laser beam with a dynamic offset frequency under the closed loop control, and sinusoidal frequency sweeping is simultaneously performed together with the frequency sweeping signal source.

Abstract: The disclosure discloses a phase delay extraction and compensation method in a PGC phase demodulation technology. The sinusoidal phase modulation interference signal is converted into a digital interference signal by an analog-to-digital converter after amplification and filtering, and the digital interference signal is subjected to orthogonal downmixing of first-order, second-order, and fourth-order harmonics simultaneously to obtain three pairs of orthogonal harmonic amplitude signals.

Abstract: The present invention discloses a real-time normalization apparatus and method of the PGC demodulation in a sinusoidal phase modulation interferometer. An optical setup containing a measuring interferometer and a monitoring interferometer is constructed. An electro-optic phase modulator is placed in the common reference arm of the two interferometers. High-frequency sinusoidal wave modulation and low-frequency triangular wave modulation are applied to the electro-optic phase modulator at the same time. Sinusoidal modulation is used for generating phase carrier, and PGC demodulation is performed to obtain quadrature signals containing the phase information to be measured. Triangular wave modulation makes the quadrature signals change periodically. Ellipse fitting is performed on the Lissajous figure corresponding to the quadrature signals, and real-time normalization of the PGC demodulated quadrature signals is achieved.

Abstract: Disclosed is a two-turn-one-movement parallel mechanism with a large turning angle, comprising a machine frame, a movable platform, a first branch and two second branches, characterized in that the first branch comprises a machine frame turning pair, a first moving pair slider, a first moving pair guide rod and a first universal joint; each one of the second branches comprises a second moving pair guide rail, a second moving pair slider, a second universal joint, a connecting rod and a movable platform turning pair; in the two second branches, the axis of the first turning pair of each one of the second universal joints is superimposed with and parallel to the axis of the machine frame turning pair in the first branch, and the axis of each one of the movable platform turning pairs is parallel to the second turning axis of the first universal joint in the first branch.