31results about How to "Achieve oscillation" patented technology

The invention relates to an optical parametric oscillator, which comprises a nonlinear optical material (1) with the double-zero dispersion wavelength, a high reflector (2), an output mirror (3), a parametric oscillation optical beam collimator (4), a parametric optical line width compressor (5), a pumped optical coupler (6), a lambda/2 phase retarder (7), a laser power controller (8) and an optical isolator (9). The nonlinear optical material (1) has a double-zero dispersion wavelength and is arranged in a resonant cavity formed by the high reflector and the output mirror. The pumped optical wavelength is in the anomalous dispersion regime of the photonic crystal fiber, thereby ensuring the phase matching conditions and generating the highly efficient four-wave mixing effect. For the parametric oscillation formed by simplifying the four-wave mixing, the wavelengths of the two parametric lights are respectively arranged at the double-zero dispersion wavelength of the photonic crystal optical fiber, thereby realizing the group velocity dispersion compensation of the parametric light, solving the problem of the ultra-short pulse dispersion compensation, and greatly reducing the pumping threshold.

This invention relates to a manufacturing method for a huge magnet impedance effect magnet-sensitive device based on micro-electromechanical system (MEMS), which applies MEMS technology to process a double-face oxidized silicon chip to get an aligned symbol carved in double faces so as to increase the aligned accuracy when exposing, applies a quasi-LIGA photo etching technology and micro plating to prepare a zigzag sandwich structure FeNi/Cu/FeNi soft magnet multiplayer membrane material, applies physical etching to remove the substrate to avoid the erosion brought with wet etching and offsets the huge magnet impedance effective curves by selecting suitable magnets to make the magnet-sensitive device to work in the linear zone.

The invention relates to a central pulsation negative-pressure arc welding device and method, and belongs to the technical field of welding equipment and methods. An inner cavity of a hollow tubular electrode and the center of an arc below the hollow tubular electrode enter a periodic negative-pressure state by virtue of an air extraction device, and when the center of the arc is in a normal-pressure state, the arc is in a free arc form; when the center of the arc is in a negative-pressure state, the arc is in a restrained state under the compression action of external atmospheric pressure; therefore, the arc is switched between a free arc and a restrained arc to implement the central pulsation negative-pressure arc welding method. The pulsation arc produced by the welding device and method has oscillation and stirring functions for a welding pool, so that liquid metal forms tiny isometric crystals, the formation of air holes is suppressed, and the mechanical performance of a welding joint is improved; the pulsation frequency and duty ratio of the arc are regulated to accurately control the oscillation and stirring of the welding pool, the welding penetration and heat input.

The invention provides compositions and a preparation method of an extra-large mode area metaphosphate optical fiber, and belongs to the technical fields of optical materials and laser. The invention solves the problem that an optical fiber cannot meet a mode field with the diameter of over 100 mu m and single-mode transmission characteristic simultaneously in the prior art. The metaphosphate optical fiber comprises a fiber core consisting of phosphorus pentoxide, alumina, potassium oxide, barium oxide, calcium oxide, magnesium oxide and rare earth oxide in a certain molar percent, and a fiber core clad layer consisting of phosphorus pentoxide, alumina, potassium oxide, barium oxide, calcium oxide and magnesium oxide in a certain molar percent. The prepared fiber core preformed rod and clad layer preformed rod are sleeved and fused, and are subjected to surface processing and drawing treatment so as to form the metaphosphate optical fiber. The metaphosphate optical fiber has excellent thermal property, optical property, mechanical property and mechanical performance.

The invention discloses a composition of an oversized model area fluorphosphate optical fiber and a preparation method thereof. The composition of the oversized model area fluorphosphate optical fiber mainly comprises an optical fiber core part and an optical fiber cladding part. The formula comprises aluminium metaphosphate, calcium metaphosphate, lithium fluoride, barium fluoride, magnesium fluoride, strontium fluoride, zirconium fluoride, lanthanum fluoride, yttrium fluoride and rare earth oxides. The composition has the structure of gain guidance-refractive index anti-guidance, the diameter of the fibre core of the gain guidance-refractive index anti-guidance optical fiber is far more than the diameter (4-10 mu m) of the fibre core of the common monomode optical fiber, and the mode field area can be above ten thousands square microns. The core diameter is 100-500 mu m; the cladding is composed of multicomponent glass, and the cladding diameter is about 250-650 mu m; and the difference delta n between the fiber core and the cladding is less than 0.05-0.28% and solves the problem that the mode field diameter is more than 100 mu m and the problem of monomode transmission characteristics.

The invention discloses a small full-automatic chemiluminescent analyzer and belongs to the technical field of chemiluminescence immune assay. The small full-automatic chemiluminescent analyzer disclosed by the invention comprises a sample reagent rack, a liquid transfer device, a magnetic bead adsorption and extraction device and a measuring and reading device which are mutually independently tiled from the front to rear. The small full-automatic chemiluminescent analyzer is favorable for installation and maintenance of instruments and is convenient to use and easy to popularize.

The invention discloses an intermediate infrared laser device with an tunable inner cavity OPO. The intermediate infrared laser device comprises an LD semiconductor pumping source, an optical fiber coupling system, a laser gain crystal, an air-cooling radiator, a crystal temperature control furnace, a film-coated endoscope and a periodically poled crystal. The film-coated endoscope comprises a front-cavity mirror plane mirror M1, an intracavity focusing lens, an OPO front-cavity mirror plane mirror M2 and a rear-cavity mirror M3. A light source generated by the LD semiconductor pumping source passes through the optical fiber coupling system and is output. The front-cavity mirror plane mirror M1, the laser gain crystal, the intracavity focusing lens, the OPO front-cavity mirror plane mirror M2, the periodically poled crystal and the rear-cavity mirror M3 are sequentially arranged in the output direction of the coupling light source of the optical fiber coupling system in parallel. The laser gain crystal is arranged on the air-cooling radiator. The periodically poled crystal is arranged on the crystal temperature control furnace. The intermediate infrared laser device is simple and compact in structure, low in energy consumption and capable of being miniaturized and fully solidified easily, and can be mounted onboard or on vehicles.

The invention discloses a frequency channel programmable LC_digitally controlled oscillator (DCO) circuit structure. An LC_DCO circuit comprises a cross-coupling tailless current source complementary programmable negative resistance module, a programmable inductor module and switched capacitor arrays. Firstly, inductors with different inductance values are selected to form a resonant cavity with a natural capacitor; then, current of a left branch circuit and a right branch circuit of a negative resistance circuit is modulated to generate negative resistance required for starting oscillation so as to achieve oscillation of an LC_DCO; and finally, effective capacitance values which are switched in the resonant cavity by the two different switched capacitor arrays are controlled, so that modulation of operating frequency ranges and tuning accuracy is achieved. The circuit structure has the characteristics of being programmable in output frequency channel and adjustable in tuning accuracy and the advantages of being small in achievement area, high in integration level and high in deign flexibility.

The invention discloses a micro-fluidic negative pressure driving normally open micro-valve which comprises a valve body and a valve element, wherein a valve cavity is formed in the valve body; a normally open input end and a normally open output end are arranged on the valve cavity; the valve element is positioned in the valve cavity and is hollow; the valve element has deformation along with internal and external pressure change of the valve element; the valve element is provided with a negative pressure input end; and negative pressure enters the valve element to deform the valve element toblock the input end or the output end so as to close the valve. According to the micro-fluidic negative pressure driving normally open micro-valve, a negative pressure signal controls on-off of a positive pressure signal to bring large deformation and higher output variable quantity; the micro-fluidic negative pressure driving normally open micro-valve is mainly used for a micro-fluidic chip, ishigher in safe reliability, can easily realize the grounding and signal gain functions similar to those of a digital circuit, realizes multiple functions of NOT gate, AND gate and or gate, and also can realize storage, oscillation and high-level application of a pneumatic signal through the design method of an equivalent circuit.

The present invention discloses a pathogenic microorganism separation and extraction apparatus, which relates to the technical field of microorganism separation and extraction. The pathogenic microorganism separation and extraction apparatus comprises a triangular flask in which sterile water is preset, a feeding assembly, an oscillating and shaking-up assembly, an extraction tube and a culture dish assembly, wherein the feeding assembly is used for quantitatively delivering soil into the triangular flask; the oscillating and shaking-up assembly is arranged outside the triangular flask in a sleeving manner and is rotationally arranged in the base; one end of the extraction tube extends into the triangular flask, the other end of the extraction tube extends into the test tube, so that the soil suspension in the triangular flask is quantitatively extracted into the test tube, and sterile water is preset in the test tube; and one end of the culture dish assembly is communicated with the bottom of the test tube, so that the diluted bacterial liquid in the test tube is collected for culture.

The invention relates to the technical field of rubber processing equipment, and specifically discloses a rubber breaker. According to the rubber breaker, a transmission adjustment assembly is arranged between a left tooth breaking roll and a middle flow distribution plate, a transmission adjustment assembly is arranged between a right tooth breaking roll and the middle flow distribution plate, and during the rotation of the left tooth breaking roll and the right tooth breaking roll, a V-shaped opening angle of an inverted-V-shaped structure of the middle flow distribution plate can be adjusted in a certain amplitude; in this way, the vibration of rubber to be broken is realized, and the problems of blockage and tooth clamping are prevented; meanwhile, a side-part flow distribution plate is connected with the left tooth breaking roll and the right tooth breaking roll through the transmission adjustment assemblies, and during the rotation of the left tooth breaking roll and the right tooth breaking roll, the side-part flow distribution plate is capable of carrying out reciprocating vibration in a certain amplitude in the left-right direction, and the axial vibration of the rubber atparts is also realized; and the blockage caused by the clamping of the rubber at a certain position is prevented by virtue of the rotation of the breaking rolls and the axial vibration of the rubber.

The invention relates to a device and method for filling fork supports with rod-shaped items and a production machine for rod-shaped items with such a device. The rod-shaped items used for tobacco processing are used for filling a device with at least one fork support and preferably two fork supports, the device comprises a mechanism constructed and disposed to be used for receiving items from a device arranged in the front and particularly used at a production machine for the rod-shaped items in a multi-layer and orderly way, a mechanism constructed and disposed to be used for receiving items from the mechanism used for receiving the items and arranged at the front in a multi-layer and orderly way and be used for giving out the items to the fork supports, and a transporting mechanism used for the fork supports. The device is advantaged in that, the mechanism used for receiving the items is completely arranged at the upper part of the fork supports and the mechanism used for receiving and giving out the items is constructed and disposed to be used for filling the fork supports in a fixed direction in a single-layer upper-lower mode. Additionally, the invention relates to a corresponding method and a production machine provided with an integrated device used for filling the fork supports.

The invention relates to a machining process for a thrust pad base of a shielding motor, which comprises the following steps of: positioning and clamping the thrust pad base by adopting a positioning tool, machining a plane on one side, adjusting the position of the thrust pad base after machining the plane on one side, re-positioning the position of the clamping tool, and machining the plane on the other side. Thrust pad base space angle size machining is completed on the same clamping mould. The thrust pad base can be machined on the same positioning fixture, the angle size and tolerance required by a drawing are guaranteed, the subsequent assembly problem caused by the fact that the space size cannot be measured is avoided, and meanwhile the problem that alignment cannot be achieved after clamping is solved.

The invention relates to a voltage-controlled oscillator oriented to distribution network state monitoring and a noise reduction and quality improvement method thereof, and belongs to the field of distribution network operation state monitoring. The voltage-controlled oscillator is based on a novel 5.17 GHz CMOS. By adopting a capacitance feedback technology for improving the circuit quality factor, the parasitic effect of the circuit can be reduced in a high frequency band on the premise of not needing an additional substrate bias voltage, the phase noise of the circuit is improved. Meanwhile, the power consumption of the circuit is reduced by adopting a self-substrate bias technology without the substrate bias voltage. The capacitance feedback technology is adopted to improve the qualityfactor of the circuit, thereby reducing the phase noise. The working voltage of the circuit is reduced by adopting a self-substrate bias technology, so that the power consumption of the circuit is reduced.

The invention discloses a gravity heat pipe based on dual-power drive enhanced heat transfer. The gravity heat pipe comprises an evaporation section and a condensation section, wherein a heat insulation section is arranged between the evaporation section and the condensation section; the evaporation section is filled with a liquid working medium, the liquid working medium absorbs heat and evaporates in the evaporation section to produce bubbles, the bubbles release heat and are condensed to form liquid drops after entering the condensation section, and the liquid drops return to the evaporation section through gravity; and a self-driven reciprocating motion module is arranged in the gravity assisted heat pipe and realizes full-coverage reciprocating automatic liquid scraping in the condensation section under the dual-power driven of the bubbles and the liquid drops. By using the gravity heat pipe, through the falling impact effect of condensate liquid drops and the buoyancy effect of rising bubbles produced by boiling, springs are driven by double power to deform and oscillate, a hollow table body is further driven to move, and the disturbance effect of a working medium in the evaporation section is enhanced; and in addition, by arranging liquid drainage rings in a segmented mode, segmented liquid scraping of the condensation section can be achieved, and therefore full-coverage liquid scraping of the condensation section is achieved.

The invention discloses a blood product infusion intelligent auxiliary system for preventing platelet aggregation. The system comprises a base plate, a negative pressure contraction assembly, a negative pressure source, a valve set and a control module. In the working process, a blood transfusion bag is hung on a hook of the base plate, the negative pressure contraction assembly is arranged on the base plate, and the negative pressure contraction assembly can extrude the blood transfusion bag in the direction of the base plate when contracting under the negative pressure effect; and then the negative pressure source is controlled by the control module to provide negative pressure for the negative pressure contraction assembly, the negative pressure contraction assembly is repeatedly switched between the negative pressure state and the atmospheric pressure state through a control valve set, then the negative pressure contraction assembly repeatedly extrudes the blood transfusion bag, and oscillation of blood products in the blood transfusion bag is achieved. Therefore, platelet aggregation in the platelet infusion process can be effectively avoided, blood product oscillation is achieved based on negative pressure driving, the system is made to be smaller, and clinical application and popularization are facilitated.