100results about How to "Realize continuously adjustable" patented technology

The invention discloses a 3D laser printing method and system. A four-parameter continuous modulation laser printout method is adopted to prepare a 3D image consisting of diffraction pixels arranged according to the position coordinates and provided with both a specific grating space frequency and an angle of orientation; the modulation method of parameters of grating stripes in the diffraction pixels is realized on the basis of a 4F imaging system and a diffraction grating; the 4F imaging system comprises a first Fourier transformation lens or lens group and a second Fourier transformation lens or lens group; the diffraction grating is placed between the first Fourier transformation lens or lens group and the second Fourier transformation lens or lens group; the distance between the diffraction grating and the first Fourier transformation lens or lens group is changed to realize continuous modulation of the space frequency of the grating stripes; and the diffraction grating is rotated to realize continuous modulation of the grating orientation angle of the grating stripes. The 3D laser printing method and system realize continuous adjustment of the space frequency and the orientation of the grating, and encodes on the basis of the four-parameter micro-nano structure with continuously changeable space frequency and orientation of the grating to form a 3D color image.

The invention relates to a coaxial Fizeau synchronous phase shifting interferometer capable of adjusting extended light illumination and belongs to the field of an optical interference measuring device. The coaxial Fizeau synchronous phase shifting interferometer comprises an extended light source assembly, a fronting Michelson type interferometer assembly and a Fizeau main interferometer. In the invention, the fronting interferometer assembly is adopted to generate two illumination light waves of orthogonal polarization state; polarization phase shifting interferometry between a measured surface and a reference surface is realized through match of spatial coherence of the fronting interferometer and the main interferometer; and an additional fringe is removed by using the characteristic of a short coherent optical length of an extended light source space. The coaxial Fizeau synchronous phase shifting interferometer has the characteristics of long measuring distance, continuous and adjustable contrast ratio, continuous and adjustable coherent optical length, easy operation, lower error requirement on a high frequency surface shape of the reference surface and the like; and the coaxial Fizeau synchronous phase shifting interferometer can be used in the fields of high precision detection of an optical element, optical element on-line detection and super-smooth surface detection and the like.

The invention discloses an abrasion tester for a cylinder sleeve-piston ring friction pair. The structure of the abrasion tester is as follows: a cylinder sleeve is fixed between first and second positioning frames; an inner sleeve is arranged in an outer sleeve; the outer sleeve is connected with a pressure spring base through a thread; inner ends of a double annular elastic supporting rod are horizontally embedded in grooves of third and fourth positioning frames; a piston ring is arranged in the groove between fifth and sixth positioning frames; an outer diameter of the piston ring is glued to an inner wall of the cylinder sleeve; the inner surface of the piston ring is tightly pressed by the outer ends of the double annular elastic supporting rod; and four stretching force sensors are uniformly mounted between the second positioning frame and a screw carriage at intervals. In the abrasion tester, a piston ring radial loading mechanism is formed by four positioning frames and the double annular elastic supporting rod; a piston ring axial loading mechanism is formed by the pressure spring base and the pressure spring, so that the change condition of explosion pressure endured by the piston ring at practical work is simulated; and the abrasion tester provided by the invention can excellently simulate the practical working condition and has the advantages of short test period, low test cost, and the like.

The invention provides a magnetically-shielded combined type friction-abrasion testing machine, which comprises a rack, a rotating mechanism, a horizontal adjusting platform, a reciprocating mechanism and a friction loading mechanism, wherein the rack consists of a bottom-layer platform, a middle-layer platform and a top-layer platform, and the middle-layer platform and the top-layer platform are positioned on the bottom-layer platform; the rotating mechanism is arranged on the middle-layer platform, the upper end of the rotating mechanism is connected with a rotating disc for placing samples, and a first magnetic shielding case is arranged at the outer peripheral side of the rotating disc; the horizontal adjusting platform is arranged on the middle-layer platform and arranged on one side of the rotating mechanism along a second direction, and the horizontal adjusting platform is provided with a turnplate seat capable of moving along the second direction; the reciprocating mechanism comprises a cylinder and a linear guide rail, the cylinder is arranged on the top-layer platform, a sample fixing seat is arranged on a slider of the linear guide rail, the linear guide rail and the horizontal adjusting platform are adjacent along a first direction, a second magnetic shielding case is arranged on the outer peripheral side of the linear guide rail, an extension rod of the cylinder is arranged on the second magnetic shielding case in a penetration manner and connected with the sample fixing seat and can drive the sample fixing seat to do reciprocating motion along the second direction; the friction loading mechanism consists of a support frame, a lifting platform and a loading assembly.

The invention discloses an adjustment support for an industrial video camera, which relates to the field of industrial video cameras and comprises a base. The base is in threaded connection with one end of a first supporting rod, the other end of the first supporting rod is connected with one end of a second supporting rod through a first spherical universal joint, the other end of the second supporting rod is connected with one end of a telescopic rod through a second spherical universal joint, and the other end of the telescopic rod is in threaded connection with a camera spherical universal joint. By means of the spherical universal joints and the camera spherical universal joint, multiple-degree-of-freedom rotation can be achieved between the supporting rods and between the supporting rods and the camera, and the camera can adapt to various shooting angles without changing the position of the support. By adjusting relative positions of the supporting rods and the telescopic rod, the camera can extend forwards into a certain special space to acquire needed image information, and the stability of the camera can be guaranteed by the adjusting base. Supporting wheels can rotate in a universal mode, and the stability of the support is guaranteed by means of supporting legs and counter weights.

The invention relates to a laser scalpel, and particularly relates to a laser scalpel with continuously adjustable out-of-focus distance for laser operations and laser cosmetic surgeries. The laser scalpel comprises a scalpel body and an adjusting lens barrel, wherein the adjusting lens barrel can be embedded into the cavity of the scalpel body in an axially sliding way and is internally provided with a focusing lens; an out-of-focus adjusting rotary barrel is sleeved on the scalpel body and is adjustably connected with the adjusting lens barrel. By virtue of the adjusting lens barrel and the out-of-focus adjusting rotary barrel, the continuous adjustability of laser focus, diameter and energy density is achieved, and the problem that the laser scalpel needs to be replaced on occasions with different requirements is solved.

The invention discloses an electron density control system of large-area uniform plasmas, and mainly solves the problems in the present plasma electromagnetic wave propagation experimental device that the electron density cannot be continuously adjusted, the long-time stability is poor and the control accuracy is low. The whole system comprises a plasma producing cavity (1), a diagnosis device (2), a power supply device (3), a vacuum device (4) and a control device (5), wherein the control device (5) is used for reading an electron density value measured by the diagnosis device (2), comparing the electron density value with a preset electron density value and outputting a voltage or air pressure control signal according to a comparative difference value; and the output power of the power supply device (3) or a set air pressure value of the vacuum device (4) is adjusted, so as to enable the electron density of the plasmas to be stabilized within a preset value range. The electron density control system has the advantages that by adopting a feedback control principle, the adjustment and the stabilization of the electron density in the large-area uniform plasmas are realized; and the electron density control system can be used for conducting propagation experiments of electromagnetic waves in plasmas with different electron density.

The invention discloses a method for directly generating a vortex beam with an adjustable order in a cavity, and the core of the method is that a laser output end face of a laser is provided with circular micropores through etching; the circular micropores are adjusted to the center of a laser beam; circular space loss modulation is formed at the center of the laser beam, and the vortex beam with a specific order is enabled to directly oscillate in the cavity and to be outputted. Through the employing of the circular micropores with different diameters and the adjustment of the relative position of the circular micropores and the center of the beam, the method can achieve the continuous adjustment of the order of the vortex beam in a large range, wherein the adjustment range can reach dozens of orders or hundreds of orders. The vortex beam generated through the method is high in purity, and is stable in transmission.

The invention discloses a hybrid excitation type flux reversing motor with asymmetric stator poles. The motor comprises a stator, a rotor, three-phase armature windings, single-phase excitation windings, and a non-magnetic rotating shaft. The rotor comprises rotor teeth and a rotor yoke. The rotor yoke is fixed on the non-magnetic rotating shaft. The rotor teeth are uniformly arranged along the circumferential direction of the rotor yoke. The stator is positioned outside the rotor teeth of the rotor, and a certain gap is formed between the stator and the rotor teeth. The stator comprises a stator yoke, stator armature teeth, stator excitation teeth, and permanent magnets. The stator armature teeth and the stator excitation teeth are alternately arranged in the circumferential direction ofthe stator, and two permanent magnets with the same polarity are arranged at the lower end of each stator armature tooth and located on the two sides of a stator armature tooth iron core. The three-phase armature windings are wound around the stator armature teeth, and the single-phase excitation windings are wound around the stator excitation teeth. According to the invention, a doubly salient structure is adopted, and the motor has a simple structure and strong robustness and is suitable for AC brushless operation. Meanwhile, because of the introduction of hybrid excitation, the air gap fluxcan be adjusted, and the speed range of the motor is improved.

The invention discloses a plasma and electrostatic adsorption coupled automobile emission purifier and purification method and belongs to the technical field of automobile emission purification. The plasma and electrostatic adsorption coupled automobile emission purifier and purification method are aimed to solve the problems of bad universality and bad processing effect of an existing automobile emission processing technology. The purifier comprises an emission purification pipe, a glass slideway, a sinusoidal high-voltage electrode, a direct-current high-voltage electrode and a grounding electrode, the emission purification pipe is divided into an emission lead-in region, a plasma processing zone, a transition zone, a static dust removing zone and an emission discharge zone in sequence from the head end to the end, the glass slideway is fixed on the outer surface of the bottom of the emission purification pipe, and the grounding electrode is arranged on the glass slideway in a sliding mode. The purification method includes that cooling the automobile emission at the emission lead-in zone; respectively carrying out plasma reaction and high-voltage static dust removing on the automobile emission in the plasma processing zone and the static dust removing zone; enabling the grounding electrode to slowly move out of the plasma processing zone to be corresponding to the static dust removing zone. The plasma and electrostatic adsorption coupled automobile emission purifier and purification method are used for the automobile emission purification.

The invention relates to a method for preparing a two-dimensional semiconductor alloy. The general formula of the two-dimensional semiconductor alloy is MoS2(1-x)Se2x, wherein x is more than 0 and less than or equal to 1. The method comprises: heating molybdenum sulfide and molybdenum selenide placed in quartz tubes respectively in an oxygen-free environment till volatilizing, keeping a volatilization temperature, and performing chemical vapor deposition on the volatilized molybdenum sulfide and molybdenum selenide on a silicon substrate under the action of introduced protective gas flow to form the two-dimensional semiconductor alloy material. The provided two-dimensional semiconductor alloy MoS2(1-x)Se2x can realize continuous adjustment of band gaps by adjusting the value of xl and the band gap adjustment of the two-dimensional semiconductor alloy MoS2(1-x)Se2x is realized by controlling the volatilization quantity of the molybdenum sulfide and the molybdenum selenide.

The invention relates to an energy feedback type linear motor testing and loading device, which belongs to the technical field of motor testing, and solves the problem that the existing linear electric motor thrust loading and testing device can only carry out unidirectional test without continuously adjusted loading force. A stand body of the device is of a U-shaped structure, supporting guide rails are symmetrically arranged on the upper surfaces of two vertical sections of the stand body, a sliding support of a motor to be tested and a sliding support of a loading motor are respectively arranged on the supporting guide rails, the sliding support of the motor to be tested is in sliding connection with the supporting guide rails through guide rail slide blocks, the sliding support of theloading motor is in sliding connection with the supporting guide rails through guide rail slide blocks, a stator of the linear motor to be tested is fixedly arranged on the inner side surface of a horizontal section of the stand body, a rotor of the linear motor to be tested is fixedly arranged on the bottom face of the sliding support of the motor to be tested, a pair of loading linear motor stators is symmetrically arranged on the inner side walls or the outer side walls of the two vertical sections of the stand body, and a pair of loading linear motor rotors is symmetrically arranged on the sliding support of the loading motor. The energy feedback type linear motor testing and loading device, provided by the invention, is applicable to loading and testing of the linear motor.

The present invention relates to a high speed image sensor based on a low speed CCD, which is characterized in that the structure is that an adjustable diaphragm is closely arranged in front of the light sensation of the low speed CCD which has a adjustable drive circuit and a peripheral circuit, and the output terminal of the CCD is connected with a denoising circuit and a module transfer circuit in sequence. The exposure region of the CCD light sensation area is controlled by the diaphragm, the CCD chip is driven by the special adjustable circuit, only the electrical charge of the CCD pixel unit of the exposure part is transferred, the electrical charge transferring time can be reduced obviously, and the frame speed of the CCD is improved. The present invention has the advantages that the structure is simple, the reliability is high, the cost is low, the measuring speed is rapid, and the precision is high, thereby the present invention is suitable for the real-time detecting in the fields of manufacturing industry, image recognition, automatic precision measurement, robotvision, and automatic following, etc.

The invention relates to an arrangement device and an arrangement method for pin electrodes in a high-voltage electrostatic separator. The device comprises the pin electrodes, electrode carriers and a negative-high-voltage power supply, wherein each electrode carrier comprises an insulated circular-tube-shaped housing and a reel-shaped metal mesh filling column; two axial strip holes are formed in the outer-circle surface of each housing, and are symmetrical about the central axis of the housing to form a penetration port for penetrating the corresponding pin electrode; a circular-barrel-shaped inner cavity of each housing is filled with the corresponding metal mesh filling column, and the corresponding metal mesh filling column is tightly jacked on the inner-circle surface of the inner cavity, the central axis of each metal mesh filling column is superposed with the central axis of the corresponding inner cavity, and the length of each metal mesh filling column is not less than the length of the corresponding inner cavity, for forming location for the corresponding pin electrode; and one end of each metal mesh filling column is connected with the negative-high-voltage power supply through a conductive wire. According to the invention, the problem that the positions of pin electrodes cannot be freely adjusted in the existing arrangement device is solved, and the optimal arrangement manner for the pin electrodes can be chosen, which are of great significance to improvement for a corona electrode structure of a pin-roll type high-voltage electrostatic separator.

The invention relates to variable birefringence unit and PMD compensator using the said unit. The variable birefringence unit includes chatter optical fiber grating and pressure generation unit. The said grating is on direction of extrusion of the pressure generation unit. A dispersion compensator in polarization mode includes a polarisation controller, detector for testing degree of polarization and central control unit. The polarisation controller receives incident light and adjusts polarized state of light signal. The dispersion compensator in polarization mode also includes the variable birefringence unit. The invention realizes birefringence being adjustable continuously so as to realize difference of group delay between polarization states being adjustable continuously.

The present invention relates to a resonant Schottky probe device and a method of using the same. The resonant Schottky probe device is characterized by comprising a resonant Schottky probe, wherein the first coupled loop antenna of the resonant Schottky probe is connected to the input end of a power splitter via a low-noise amplifier; the first output end of the power splitter is connected to a first load or a band-pass filter; the band-pass filter is connected to a spectrum analyzer; the second output end of the power splitter is connected to a second load and an adjustable attenuator through a switch; the adjustable attenuator is connected to a low-pass filter through an adjustable phase shifter; the output end of the low-pass filter is connected to the input end of a four-port bidirectional coupler; the coupling end of the four-port bidirectional coupler is connected to a third load and a fourth load; the output end of the four-port bidirectional coupler is connected to the first port of a vector network analyzer or the second coupled loop antenna of the resonant Schottky probe; and the second port of the vector network analyzer is connected to the second coupled loop antenna of the resonant Schottky probe. The resonant Schottky probe device can be widely used in the field of beam diagnosis of heavy ion beam accelerators.

The invention provides a gain filter circuit applicable to scientific-grade CCDs (charge coupled device), in particular to the processing circuit of CCDs. The gain filter circuit comprises an operational amplifier, two analog switches (S1 and S2), a resistor (R) and a capacitor (C), wherein the analog switch S2 is connected with the capacitor (C) in parallel to jointly form the negative feedback of the operational amplifier; the non-inverting input terminal of the operational amplifier is grounded, and the inverting input terminal thereof is connected with the output signal of the CCD via the resistor (R); and the output signal of the CCD is grounded via the other analog switch (S1). Followed by the start of the driving circuit of the CCD, the gain filter circuit can continuously adjust the amplification of the circuit on a real-time basis by adjusting and feeding back the disconnection time of the analog switch (S2) according to the driving timing sequence of the CCD; and by adjusting the capacitance of the capacitor (C) and the resistance of the resistor (R), the gain filter circuit can vary the amplification within a large range and vary the cutoff frequency of the circuit, thus achieving the low-pass filter on the output signals of the CCD. Accordingly, based on the simple control, the invention can achieve the continuously adjustable gain and the filter function.

The invention belongs to the technical filed of neutron scattering and discloses a shielding device of a neutron monochromator. The device has a closed cylindrical drum-shaped structure; a middle rotating part consists of a rotating tray which is provided with a gear ring and N+1 rotating preventing electromagnets, a large wedge block arranged on the rotating tray, N small division wedge blocks and a lower rotating tray bearing; the large wedge block and the rotating tray are mutually fixed together; and the N small division wedge blocks are sequentially arranged on the gap position of the large wedge block. A fixed electromagnet is arranged above the small wedge block, and the rotating preventing electromagnets and the fixed electromagnet attract the small wedge blocks when being electrified. The technical proposal provided by the invention finishes the complicated movement by the matching of software and hardware, and the structure is simple and the processing is convenient.

The invention relates to a tunable external-cavity semiconductor laser, comprising a semiconductor light amplifier, and the following components orderly arranged on a light path of the semiconductor light amplifier emitting laser: a collimating lens, a rotatable Fabry-Perot light filter, a first perfectly reflecting mirror, a partially reflecting mirror and a second perfectly reflecting mirror; and the partially reflecting mirror is perpendicular to the light path of the laser emitted via the first perfectly reflecting mirror. The tunable external-cavity semiconductor laser further comprises an actuator fixedly connected with the partially reflecting mirror, wherein the actuator comprises a contact plane parallel to the partially reflecting mirror; one end of the Fabry-Perot light filter is lapped on the contact plane; and the actuator moves in the direction of the normal line of the partially reflecting mirror so as to change the included angle between the Fabry-Perot light filter and the light path of the laser. The tunable external-cavity semiconductor laser can be tuned without influence on the light path; the direction of output laser beam can not be changed along with the tuning of the wavelength; and continuous tuning of the wavelength can be realized.

The invention provides a pipeline cathodic protection and interference comprehensive console. According to the structure of the console, an industrial personal computer is used for controlling connection and disconnection of electronic switches of a potentiostat output switching unit and an interference state switching unit so as to control the signal output state of the potentiostat, a rectifier and a voltage regulator; the signal output end of the potentiostat is connected with a cathodic protection external circuit; the signal output end of the rectifier is connected with a direct current interference external circuit; the signal output end of the voltage regulator is connected with an alternate current interference external circuit; and information of external circuits is transmitted to the industrial personal computer by a data collection module, and is displayed by output equipment on the industrial personal computer. By adopting the structure and method, the technical problems that the true environment of a pipeline is difficult to reappear and the requirements for verifying accuracy of detection equipment and detection process cannot be met in the prior art can be solved.

The invention discloses a line anti-vibration hammer capable of adjusting resonant frequencies, relates to a line anti-vibration hammer, and aims at solving the problems that the existing antivibrator only can be matched with several resonant frequencies, and a resonance vibration attenuation effect cannot be exerted on other numerous frequencies. A line sheath of the line anti-vibration hammer disclosed by the invention covers a lead; a clip assembly is arranged on the line sheath; a middle support plate is connected with the lower end of the clip assembly through bolts; a bottom support plate is arranged at the lower end of the middle support plate; a stepping motor is arranged on the bottom support plate through a pressing plate; the output end of the stepping motor is connected with a screw; two ends of the screw are respectively supported by a first rotating part and a second rotating part and are rotatably connected; a worm wheel is arranged on the bottom support plate above the screw; the middle part of a rotating lever is rotatably arranged on the middle support plate; two ends of the rotating lever are respectively and rotatably connected with one end of a first connecting rod and one end of a second connecting rod; the other end of the first connecting rod and the other end of the second connecting rod are respectively and rotatably connected with a resonant device. The line anti-vibration hammer disclosed by the invention is used for resonant frequency adjustment of an overhead line.

The invention discloses a light source capable of adjusting color temperatures and color rendering indexes. The light source comprises a substrate, a blue light emitting diode, multiple fluorescent membranes and control modules correspondingly connected with the fluorescent membranes, wherein the blue light emitting diode is installed on the substrate, and the fluorescent membranes are installed on a light emitting light path of the blue light emitting diode according to a particular order. According to the light source, externally-output color temperature control signals are received throughcontrol cores, fluorescent membrane adjusting signals are calculated and output through preset control programs, action executing mechanisms receive the signals of the control cores to drive the fluorescent membranes to act and enable the overlap positions of the fluorescent membranes to change, and therefore blue light excites fluorescent conversion materials with different proportions, that is to say, the different color temperatures and color rendering indexes can be obtained. According to the light source, large-range continuous adjustment of the color temperatures and the color renderingindexes is achieved, LED driving portions only need to conduct constant outputting, and the light source has no thermal mismatch risks and is safe, reliable, low in cost and long in service life.

The invention discloses a laser scanning cutting optical system based on four rotary optical wedges. The laser scanning cutting optical system comprises an aberration eliminating collimating lens set,a first round-wedge-shaped lens, a second round-wedge-shaped lens, a third round-wedge-shaped lens, a fourth round-wedge-shaped lens and an aberration eliminating focusing lens set. The wedge-shapedface of the second round-wedge-shaped lens deviates from or is opposite to the wedge-shaped face of the first round-wedge-shaped lens. The wedge-shaped face of the third round-wedge-shaped lens is opposite to the wedge-shaped face of the fourth round-wedge-shaped lens. The aberration eliminating collimating lens set, the first round-wedge-shaped lens, the second round-wedge-shaped lens, the thirdround-wedge-shaped lens, the fourth round-wedge-shaped lens and the aberration eliminating focusing lens set are in shapes of cylinders coaxial with respect to the central axis, the first round-wedge-shaped lens, the second round-wedge-shaped lens, the third round-wedge-shaped lens and the fourth round-wedge-shaped lens can rotate around the central axis. The laser scanning cutting optical systembased on four rotary optical wedges is suitable for high-power fiber laser cutting application, can remarkably improve the cutting speed and quality of medium-thickness boards and effectively improvesthe perpendicularity of the cutting cross sections and board surfaces of the boards.

The invention discloses a circuit for testing output characteristics of a GaN power device and a control method. The circuit comprises an isolation driving chip, a GaN power switching device VT1, a first RC absorption protection circuit, an inductor L, a driving magnetic bead FZB, a resistor R, a GaN power switching device VT2 to be tested, a second RC absorption protection circuit, a direct-current power supply Vd and a high-isolation power supply. According to the circuit provided by the invention, the output characteristics of the GaN power device can be tested on a very small tooling plate, electromagnetic interference and parasitic parameters caused by a control signal and a main line connecting line can be effectively avoided, and the accuracy of a test result is improved.

The invention belongs to the technical field of terahertz communication, and particularly relates to a terahertz band-pass filter structure unit which comprises an upper layer metal (1), a dielectric layer (2) and a lower layer metal (3) which are sequentially arranged in a stacked mode. The central points of the upper-layer metal (1), the dielectric layer (2) and the lower-layer metal (3) are located on the same axis, the lower-layer metal (3) is provided with a hollow hole (31), the upper-layer metal (1) is located right above the hollow hole (31), the upper-layer metal (1) and the lower-layer metal (3) form a complementary structure, structural units are periodically arranged and unfolded in a plane, and the terahertz band-pass filter is formed. According to the invention, the response frequency of the modulator is adjusted by using the change of the deflection angle between the complementary structures, and the continuous adjustment of the frequency is realized. In addition, the invention also discloses a continuous modulation method.

The invention provides an intelligent cutting fluid follow-up system for a machine tool. The system comprises a program reading unit, an information processing unit and a cutting fluid follow-up device. The program reading unit reads numerical control program codes of the machine tool and sends the numerical control program codes to the information processing unit. The information processing unitcontrols the cutting fluid follow-up device, adjusts a position and a spraying angle of a cutting fluid nozzle and adjusts spraying pressure and a flow of a cutting fluid according to a preset cuttingfluid spraying area and requirements. Actual use efficiency of the cutting fluid can be improved, cooling and lubricating effects of the cutting fluid on a cutting area are improved, and a service life of a cutting tool is prolonged.

The invention discloses an adjustable microwave circuit test fixture. The fixture of the invention is a fixture which can fix microwave circuit boards of different shapes and sizes; the fixture can be divided into a bottom sheet layer, a gasket sheet layer and a pressing sheet layer which are distributed sequentially from bottom to top; the gasket sheet layer includes two metal sliders and an SMA connector; slide slot structures are formed in a bottom plate and pressing sheets; and fixing holes are formed in the metal sliders and are used for fixing the SMA connector. According to the adjustable microwave circuit test fixture of the invention, the positions of the metal sliders and the pressing sheets are adjusted through the slide slots and are fixed through screws, and therefore, the microwave circuit boards of different shapes can be well fixed, and the microwave circuit boards can be made to be in multi-point grounding states; since the SMA connector is fixed on the metal sliders through screws, and therefore, problems caused by poor welding or poor grounding in a circuit test can be solved, and the problem of the falling of the SMA connector caused by cable connection can be also solved.

The invention discloses a large current generator for current transformer calibration and a control method thereof. The large current generator for current transformer calibration comprises a main ACcontactor, a large current generator, a rectifier and filter circuit, a forward AC contactor, a negative AC contactor, a sampling resistor and a centralized controller. The centralized controller is adopted to realize that the current is continuously adjustable between -1200 A and + 1200 A, -1200 A -+ 1200 A DC signals and reference signals with the accurate current magnitude can be provided for current transformer calibration, and the problem of accurately calculating the remaining capacity of the battery can be better solved.

The invention is applicable to fluorescent lighting, and provides a fluorescent lamp and a method for adjusting color temperature and luminous flux of the fluorescent lamp. The fluorescent lamp comprises a lamp housing, fluorescent powder, a first discharge lamp, a second discharge lamp and a voltage adjusting device, wherein the fluorescent powder is coated on the inner surface of the lamp housing; the first discharge lamp and the second discharge lamp are arranged in the lamp housing; the voltage adjusting device is connected with the first discharge lamp and the second discharge lamp respectively; and the fluorescent powder is three-primary-color fluorescent powder. The method comprises the following steps of: generating first exciting light and second exciting light by the first discharge lamp and the second discharge lamp in the lamp housing of the fluorescent lamp; and adjusting intensities of the first exciting light and the second exciting light through the voltage adjusting device so as to adjust the color temperature and the luminous flux of the fluorescent lamp respectively. By adopting the method, the color temperature and the luminous flux of white light emitted by the fluorescent lamp are adjusted in wide ranges, meanwhile, luminous efficiency and color rendering property of the fluorescent lamp are not influenced, and the fluorescent lamp is suitable for various occasions.

The invention belongs to the field of 3D printing and particularly relates to a double-nozzle concrete printing device and printing method. The device comprises a three-axis motion platform and further comprises a spray head device A, a spray head device B and a blade stirring and discharging device located above the three-axis motion platform. The spray head device A is used for spraying concretegrout. The spray head device B is used for spraying foaming resin or a wet mixed material. The blade stirring and discharging device is used for adding a dry mixed material into a workpiece to be printed. The printing method comprises the steps of conveying of the concrete grout, the foaming resin or (and) other necessary mixed materials, distribution of the printing process, transporting and adding of additives required in the concrete grout, printing and shape correction of building structural parts, cleaning of the interiors of spray heads during printing breaks and cleaning after completion of printing. The double-nozzle concrete printing device can realize efficient and rapid forming of large building structural parts containing different reinforcing materials, gives sufficient consideration to the printing precision and the mechanical performance of the building structural parts and provides a new process idea for application of building materials in the field of additive manufacturing.