31results about How to "High decay rate" patented technology

The aim of the invention is to provide a method for measuring the content of the suspending mud in the water body and the measuring device thereof, the method for measuring the content of the suspending mud in the water body comprises the following steps: 1) transmitting infrared light into the suspending mud water body with infrared light emitting diode as excitation light source, and arranging a plurality of silicon photocells at the front and side of the infrared light emitting diode for respectively receiving the light signal scattered by the suspending mud; 2) adopting a front-end amplifying circuit for executing signal amplifying to the light signal; 3) converting the analogue signal to digital signal with the AD collecting circuit; 4) outputting the testing data by the control part of the single-chip. In the invention by receiving the scattered signal through a plurality of silicon photocells from different positions the concentration detecting range of the suspending mud is increased; the floating alga, the colored matter and the like transparent or semitransparent suspending substance and mud with bigger grain diameter hardly affect the measurement result.

The invention discloses an active shock absorption and vibration isolation device. In the device, a speed signal of an object which is subjected to vibration isolation is converted into a ceiling damping force signal to act on the object which is subjected to the vibration isolation by the technology of non-linear fractional order ceiling damping control to achieve the vibration isolation effect of the low-vibration transmissibility and high attenuation ratio of the object which is subjected to the vibration isolation; and thus, the robustness of damping control can be improved, and the dynamic characteristic of shock absorption and vibration isolation device can be improved.

The invention provides a built-in metal vibrator vibration and noise reduction dynamic vibration absorber structure of a steel rail. The structure is arranged on the two sides of a steel rail web between two adjacent fasteners and comprises coating body protecting layers, elastic damping bodies and metal mass bodies. Each elastic damping body is tightly attached and fixed to the steel rail and comprises a first elastic damping body and a second elastic damping body which are stacked and fixed into a whole, wherein the hardness of each first elastic damping body is larger than that of each second elastic damping body. Each metal mass body is made of multiple wriggling wavy metal plates which are nested in the corresponding elastic damping body at intervals. Each coating body protecting layer covers the exposed face of the corresponding elastic damping body. By the adoption of the structure, on the premise that the requirement for the sufficient strength of a damping material is met, thedamping effective working area is increased in a wriggling mode, the vibration transmission attenuation rate is increased, the damping material has two different degrees of hardness so as to meet thevibration reduction requirements in different frequency ranges, rail traffic operation noise can be effectively reduced from the position of a noise source, and utilization of the structure does notaffect maintenance of rail traffic original infrastructures and rails.

The invention discloses a specialized membrane bag for white mushroom, which belongs to a field of fruit and vegetable preserving technology. The components and the weight proportion of each component are as follows: 100 shares of LDPE, 2-4 shares of SiO2, 8-12 shares of SBS, 13-15 shares of EVA, 0.6-0.8 shares of polyethylene glycol, 0.4-0.7 shares of glycerin monostearate, 1.2-1.6 shares of calcium phosphate, 1.5-2.5 shares of zeolite and 0.4-0.6 shares of paraffin. The bag is characterized in that the bag has good gas-selective permeability, can create a gaseous micro-environment suitable for white mushroom storage, and at the same time avoids the condensation phenomenon in the membrane bag , timely absorbs the ethylene, etc., ripening gas produced in the process of white mushroom storage, thus effectively inhibiting the respiration of the white mushroom, reducing the occurrence of browning, bletting and spoilage etc., so as to prolonging the white mushroom storage period and keep the good quality thereof. The bag can be popularized for application in the field of white mushroom storage and preservation.

The invention discloses a periodic cavity type vibration isolator with low frequency and a broad-band gap and a preparation method. The vibration isolator comprises two or more than two periodic units. Each periodic unit comprises two thin plate main bodies and a ring cavity scattering body, wherein outer edges of the two thin plate main bodies are connected by virtue of the ring cavity scattering body to form a cavity; and the periodic units are connected through a connecting block scattering body. The preparation method comprises the following steps: selecting materials to prepare the thin plate main bodies, the ring cavity scattering body and the connecting block scattering body; regulating geometrical parameters of the thin plate main bodies, the ring cavity scattering body and the connecting block scattering body, so that effective band gap frequency of the vibration isolator can cover vibrating frequency of a required vibration isolating environment; checking whether the vibration isolator meets a safety condition or not so as to prepare the periodic cavity type vibration isolator with low frequency and the broad-band gap. The periodic cavity type vibration isolator disclosed by the invention is suitable for isolating low-frequency vibration, can realize vibration isolation within a wide frequency range while keeping corresponding bearing capacity, can form a band gap at a lower-frequency band, and has a boarder band gap, a relatively small dimension, and higher vibration attenuation rate.

The invention discloses a precision damping assembly and a damping platform formed by the precision damping assembly, which has the functions of damping and Z-direction positioning. Precision damping components include passive damping components, active damping actuators and outer frames. The passive damping part adopts a piston rod with a double-cavity structure. The airbag and the pressure chamber are respectively located in the two cavities. The airbag has a large longitudinal support force and low rigidity, which can isolate and attenuate high-frequency vibration. The active vibration damping actuator is a linear voice coil motor, which is connected in parallel with the passive vibration damping part. According to the vibration state and position information of the controlled object, it exerts force on the passive object, drives the controlled object to move to the designated position and compensates for the vibration. . The vibration reduction platform composed of at least three precision vibration reduction components has multi-degree-of-freedom vibration reduction, Z-direction precise positioning and leveling and focusing functions. The invention can be used in equipment requiring precision vibration reduction, such as photolithography machines, ultra-precision numerical control machine tools, and biological chip scanners.

A variable damping vibration isolator based on ultrasonic motor adjustment comprises a base, a magneto-rheological damper and an adapter plate, and mainly utilizes the magneto-rheological damper to support and consume vibration energy. The magneto-rheological damper comprises an upper cavity, a lower cavity, a connecting ring, a permanent magnet, a throttling hole, a magnetic conductive ring, an ultrasonic motor and the like. Magneto-rheological fluid is stored in an upper cavity and a lower cavity formed by corrugated pipes, the middle section and the two ends of each cavity are used as inputand output ends of vibration, so the simulation piston movement of the damper without dynamic and static clearances is achieved, fluid is pushed to flow, fluid damping is provided, and leakage can beavoided during long-term on-orbit work. Moreover, the magneto-rheological damper adopts an ultrasonic motor to drive the permanent magnet to rotate, and the overlap ratio of the permanent magnet andthe throttling holes is adjusted, that is, the number of the throttling holes entering the magnetic field of the permanent magnet is adjusted, and the damping size of the damper is changed. After theultrasonic motor rotates in place, outage self-locking can be achieved. The ultrasonic motor is used for adjusting the number of the orifices in the magnetic field, and the damping is adjusted.

Being positioned between inner conductor and outer conductor, the insulator is in shape of corrugated pipe. Being composed of thermoplastic fluoride bearing resin, the insulator includes an insulated layer and insulated ribs. The insulated layer includes a circumference face cladding the inner conductor. Insulated ribs are extruded from the insulated layer along radial direction, and are contacted to outer conductor. The insulated ribs possess continuous shape in axial direction. Three more insulated ribs are distributed along circumferencial direction discretely in each other.

The invention relates to a spontaneous air-adjusting preservation method for cherries. In the method, a nylon film, an EVOH (Ethylene Vinyl Alcohol Copolymer) film, a polypropylene film or a polyethylene preservative film with thickness of 40-80 mum is adopted; 1 -20 tiny air holes are formed in every 100cm<2> of the film; and the aperture of the air holes is between 0.01mm and 2.5mm. The film isprepared into a preservation bag according to size of package for packaging the cherries in a sealing way, and the cherries are placed under an environment with the temperature of 0-2 DEG C to be preserved for 60-90 days, so that fresh fruit rate of the cherries can be kept to be more than 90 percent. By adopting the method, quality of the cherries can be obviously kept, and preservation period can be prolonged.

The invention relates to a coplane low-pass filter which comprises a substrate, a center conductor, two grounding surfaces, a first coupling line, two second coupling lines and four third coupling lines. The substrate has a first surface, wherein the surface is provided with a signal input port and a signal output port which are separated oppositely; the center conductor comprises a first end in electrical connection with the signal input port, a second end in electrical connection with the signal output port, and a center portion; each grounding surface is provided with a groove in the place corresponding to the center portion of the center conductor; the first coupling line has two open circuit ends, wherein the two open circuit ends extend into the grooves in the two grounding surfaces respectively; a gap is formed between each second coupling line and the center conductor; the four third coupling lines each have a feed-in end and an open circuit end, wherein a gap is formed between the open circuit end of each third coupling line and first coupling line, and attenuation characteristics and 3-dB cut-off frequency of the coplane low-pass filter can be adjusted by changing the distance of the gap as well as the first distance and the second distance. Through the structure above, the coplane low-pass filter has the beneficial effects of simple structure, low insertion loss and high attenuation rate and the like.

The invention provides a photonic crystal amplitude limiting structure based on a topological interface state and an optical Kerr effect. The amplitude limiting structure is formed by periodically arranging four media into a photonic crystal according to a certain sequence. The four media are set as A, B, C and D, wherein a photonic crystal structure containing N periods is (A0.5BA0.5)N(C0.5DC0.5)N, the medium A and the medium B are nonlinear optical materials and form a left side part (PC_L) of the photonic crystal, the medium C and the medium D are linear optical materials and form a right side part (PC_R) of the photonic crystal, and a subscript 0.5 represents half of the basic unit of the medium. The topological properties of the left side part of the photonic crystal and the left sidepart of the photonic right crystal are different. High transmittance of weak light and high attenuation rate of strong light can be achieved for 1064.15 nm laser, and the structure can also be suitable for laser amplitude limiting of other wavelengths by selecting proper materials and adjusting thickness parameters.

The invention discloses a ginseng preservation method based on electron irradiation, and belongs to the technical field of food preservation. The invention aims to provide an effective ginseng preservation method. The invention provides a ginseng fresh-keeping method based on electron radiation, which comprises the following steps: carrying out electron radiation treatment on ginseng for 40-60 seconds at the absorbed dose of the electron radiation of 2.0-4.0 kGy, and storing the ginseng in a refrigeration house, thereby providing a new way for the ginseng fresh-keeping method.

The present invention discloses a radio frequency filter having a periodic structure. The radio frequency filter comprises: a substrate including opposite first and second side surfaces; conductor patterns symmetrically disposed on the first side surface and the second side surface of the substrate, wherein each conductor pattern includes a plurality of connecting rails and two intersecting connecting wires, two ends of the connecting rails are connected to the connecting wires, and equidistantly disposed between the connecting wires in parallel, so that the length of the connecting rails is reduced equidistantly in the direction near the intersection of the connecting wires. According to the radio frequency filter with the periodic structure, mutually symmetric conductor patterns are produced on the substrate, each conductor pattern comprises a periodic structure formed by the connecting wires and the connecting rails which are equidistantly arranged and having an increasing length. According to the Bloch's theorem, the periodic structure can create a Brillouin zone to form a plurality of discrete stop bands.

A variable damping vibration isolator based on ultrasonic motor adjustment, including a base, a magnetorheological damper, and an adapter plate, mainly using the magnetorheological damper to support and consume vibration energy; the magnetorheological damper includes an upper cavity , lower chamber, connecting ring, permanent magnet, orifice, magnetic ring, ultrasonic motor, etc.; the magnetorheological fluid is stored in the upper and lower chambers composed of bellows, and the middle and both ends of the chamber are used as vibration The input and output ends realize the simulated piston movement of the damper without dynamic and static gaps, promote fluid flow, provide fluid damping, and can work without leakage during long-term on-rail operation. In addition, the magnetorheological damper uses an ultrasonic motor to drive the permanent magnet to rotate, and adjusts the coincidence degree between the permanent magnet and the orifice, that is, adjusts the number of orifices entering the magnetic field of the permanent magnet to change the damping size of the damper. After the ultrasonic motor rotates in place, it can be powered off and self-locked. The invention realizes the use of the ultrasonic motor to adjust the number of orifices in the magnetic field and adjust the damping size.

The invention relates to a spontaneous air-adjusting preservation method for cherries. In the method, a nylon film, an EVOH (Ethylene Vinyl Alcohol Copolymer) film, a polypropylene film or a polyethylene preservative film with thickness of 40-80 mum is adopted; 1 -20 tiny air holes are formed in every 100cm<2> of the film; and the aperture of the air holes is between 0.01mm and 2.5mm. The film isprepared into a preservation bag according to size of package for packaging the cherries in a sealing way, and the cherries are placed under an environment with the temperature of 0-2 DEG C to be preserved for 60-90 days, so that fresh fruit rate of the cherries can be kept to be more than 90 percent. By adopting the method, quality of the cherries can be obviously kept, and preservation period can be prolonged.

The invention relates to an application of multilayer foamed iron-nickel metal materials and aims to provide an application of the multilayer foamed iron-nickel metal materials in isolation and suppression of gas explosion in order to explore the isolation and suppression conditions of the multilayer foamed iron-nickel metal materials in the aspect of the gas explosion. A method comprises steps asfollows: 2-3 layers of the foamed iron-nickel metal materials are arranged at intervals, the distance between every two adjacent foamed iron-nickel metal materials is 5-20 cm, the thickness of each layer of the foamed iron-nickel metal material is 2-3 cm, porosity of the foamed iron-nickel metal material close to the side of a detonating point is 20-30 PPI, and porosity of the other foamed iron-nickel metal materials is 10-30 PPI. The invention applies to the field of gas explosion suppression and isolation.

The invention discloses a one-dimensional photonic crystal-based nonlinear laser amplitude limiting structure. The laser amplitude limiting structure is composed of a photonic crystal made of three kinds of media which are arranged in a certain order, wherein the three kinds of media are A, B and C respectively; the structure of the photonic crystal is (AB)6CAC(AB)6; three kinds of media A, B andC suitable for a 532nm laser amplitude limiting photonic crystal structure are diamond, SrF2 and CS3-68 glass respectively, and the thicknesses of the medium layer A, medium layer B and medium layer Care 184.1nm, 92.0nm and 138.1nm respectively; and three kinds of media A, B and C suitable for a 1064nm laser amplitude limiting photonic crystal structure are diamond, CeF3 and CdTe respectively, and the thicknesses of the medium layer A, medium layer B and medium layer C are 149.3nm, 74.7nm and 112.0nm respectively. The one-dimensional photonic crystal-based nonlinear laser amplitude limiting structure of the invention can be effectively used in the 532nm and 1064nm wavelength laser amplitude limiting system so as to achieve high transmittance for low light and high attenuation rate for strong light.

The invention provides a vibration reduction steel rail which is composed of a steel rail face, a steel rail side face, a steel rail waist part and a steel rail bottom. A vibration reduction mechanism is arranged at the steel rail bottom and the steel rail waist part. The vibration reduction mechanism of the steel rail can improve the attenuation rate of vibration along the steel rail without increasing the noise of sleepers, and the obvious noise reduction effect can be achieved.

The invention provides a built-in metal vibrator vibration and noise reduction dynamic vibration absorber structure of a steel rail. The structure is arranged on the two sides of a steel rail web between two adjacent fasteners and comprises coating body protecting layers, elastic damping bodies and metal mass bodies. Each elastic damping body is tightly attached and fixed to the steel rail and comprises a first elastic damping body and a second elastic damping body which are stacked and fixed into a whole, wherein the hardness of each first elastic damping body is larger than that of each second elastic damping body. Each metal mass body is made of multiple wriggling wavy metal plates which are nested in the corresponding elastic damping body at intervals. Each coating body protecting layer covers the exposed face of the corresponding elastic damping body. By the adoption of the structure, on the premise that the requirement for the sufficient strength of a damping material is met, thedamping effective working area is increased in a wriggling mode, the vibration transmission attenuation rate is increased, the damping material has two different degrees of hardness so as to meet thevibration reduction requirements in different frequency ranges, rail traffic operation noise can be effectively reduced from the position of a noise source, and utilization of the structure does notaffect maintenance of rail traffic original infrastructures and rails.

A circuit arrangement for decaying of a transient current flow between a first point and a second point on a neutral line of a high-voltage direct current (HVDC) power transmission system is provided.The circuit arrangement may include a first branch including a first winding and a resistive element connected in series, and a second branch including a second winding and a switching element connected in series. The first branch and the second branch may be connected in parallel between the first point and the second point. The first winding and the second winding may form part of separate inductors, or be mutually coupled and form part of a same mutual inductor. An inductance of the first winding may be smaller than an inductance of the second winding. A voltage source converter (VSC) station and a HVDC power transmission system are also provided, as well as methods for modifying / upgrading a HVDC power transmission system and methods for operating a circuit arrangement during a converter bus fault.

The present invention discloses a radio frequency filter having a periodic structure. The radio frequency filter comprises: a substrate including opposite first and second side surfaces; conductor patterns symmetrically disposed on the first side surface and the second side surface of the substrate, wherein each conductor pattern includes a plurality of connecting rails and two intersecting connecting wires, two ends of the connecting rails are connected to the connecting wires, and equidistantly disposed between the connecting wires in parallel, so that the length of the connecting rails is reduced equidistantly in the direction near the intersection of the connecting wires. According to the radio frequency filter with the periodic structure, mutually symmetric conductor patterns are produced on the substrate, each conductor pattern comprises a periodic structure formed by the connecting wires and the connecting rails which are equidistantly arranged and having an increasing length. According to the Bloch's theorem, the periodic structure can create a Brillouin zone to form a plurality of discrete stop bands.

The invention discloses an active shock absorption and vibration isolation device. In the device, a speed signal of an object which is subjected to vibration isolation is converted into a ceiling damping force signal to act on the object which is subjected to the vibration isolation by the technology of non-linear fractional order ceiling damping control to achieve the vibration isolation effect of the low-vibration transmissibility and high attenuation ratio of the object which is subjected to the vibration isolation; and thus, the robustness of damping control can be improved, and the dynamic characteristic of shock absorption and vibration isolation device can be improved.

The invention pertains to the technical field of precision damping, and is a heavy-load precision damper and a damping system comprising thereof. The damper comprises a low-rigidity air spring with variable damp, an inverted-pendulum structure with low horizontal rigidity and a group of three-degree-of-freedom active damping actuators. The structure of the air spring is external-internal annularity double air chambers communicated with a throttling hole; the inverted-pendulum structure comprises a main supporting rod and at least two flexible swing rods and is located in an annular air chamber; and the active damping actuator comprises three linear motors arranged in an orthogonal manner. The heavy-load precision damper vertically generates large bearing force by the air spring, respectively separates vertical and horizontal vibration transmission by the air spring and the inverted-pendulum structure, and actively controls the damp vibration by acting force of the vertical and horizontal linear motors. The damping system comprises at least three heavy-load precision dampers arranged in the shape of a polygon, and realizes six-degree-of-freedom precision damping of a vibration-isolation device by the mutual action of every heavy-load precision dampers.

The invention discloses a periodic cavity type vibration isolator with low frequency and a broad-band gap and a preparation method. The vibration isolator comprises two or more than two periodic units. Each periodic unit comprises two thin plate main bodies and a ring cavity scattering body, wherein outer edges of the two thin plate main bodies are connected by virtue of the ring cavity scattering body to form a cavity; and the periodic units are connected through a connecting block scattering body. The preparation method comprises the following steps: selecting materials to prepare the thin plate main bodies, the ring cavity scattering body and the connecting block scattering body; regulating geometrical parameters of the thin plate main bodies, the ring cavity scattering body and the connecting block scattering body, so that effective band gap frequency of the vibration isolator can cover vibrating frequency of a required vibration isolating environment; checking whether the vibration isolator meets a safety condition or not so as to prepare the periodic cavity type vibration isolator with low frequency and the broad-band gap. The periodic cavity type vibration isolator disclosed by the invention is suitable for isolating low-frequency vibration, can realize vibration isolation within a wide frequency range while keeping corresponding bearing capacity, can form a band gap at a lower-frequency band, and has a boarder band gap, a relatively small dimension, and higher vibration attenuation rate.

The object of the present invention is to provide an adjustable periodic damping steel rail, which is characterized in that it includes a rail body, a layered phononic crystal structure, a one-dimensional phononic crystal damping layer, a lateral vibration transmission rod, a bolt rod with holes, Fastening nut, vertical vibration transmission rod, particle damper, crank connecting rod cavity, rectangular section cavity. The solution of the present invention increases the vertical static stiffness and damping of the rail, improves the attenuation rate of the wheel-rail vibration along the track direction, and at the same time blocks the primary noise radiated by the wheel-rail, and effectively controls the vibration and noise in the low-medium frequency domain of the track structure. Vibration energy is dissipated in a wide frequency band from 0 to 2000 Hz, and the overall structure is easy to disassemble and replace parts.

The aim of the invention is to provide a method for measuring the content of the suspending mud in the water body and the measuring device thereof, the method for measuring the content of the suspending mud in the water body comprises the following steps: 1) transmitting infrared light into the suspending mud water body with infrared light emitting diode as excitation light source, and arranging a plurality of silicon photocells at the front and side of the infrared light emitting diode for respectively receiving the light signal scattered by the suspending mud; 2) adopting a front-end amplifying circuit for executing signal amplifying to the light signal; 3) converting the analogue signal to digital signal with the AD collecting circuit; 4) outputting the testing data by the control partof the single-chip. In the invention by receiving the scattered signal through a plurality of silicon photocells from different positions the concentration detecting range of the suspending mud is increased; the floating alga, the colored matter and the like transparent or semitransparent suspending substance and mud with bigger grain diameter hardly affect the measurement result.

The invention proposes a photonic crystal limiting structure based on topological interface state and optical Kerr effect, and the limiting structure is composed of four kinds of media arranged periodically in a certain order to form photonic crystals. Assuming that the four media are A, B, C and D, the photonic crystal structure containing N periods is (A 0.5 BA 0.5 ) N (C 0.5 DC 0.5 ) N , where media A and B are nonlinear optical materials, which constitute the left part of the photonic crystal ( PC_L ), media C and D are linear optical materials, which constitute the right part of the photonic crystal ( PC_R ), the subscript 0.5 represents half of the basic unit of the medium. The topological properties of the left part of the photonic crystal and the left part of the photonic right crystal are different. The present invention can realize high transmittance for weak light and high attenuation rate for strong light for 1064.15nm laser. By selecting appropriate materials and adjusting thickness parameters, the structure can also be applied to laser limiting of other wavelengths.

An analog amplification vacuum tube according to the present invention suppresses the influence of filament vibration on amplification characteristics. The analog amplification vacuum tube according to the present invention is provided with a filament, an anode, a grid, and a vibration-proof part. The filament is linearly laid, and emits thermoelectrons. The anode is disposed in parallel with thefilament. The grid is disposed, so as to oppose the anode, between the filament and the anode. The vibration-proof part has a thin film usable in a vacuum environment, and the thin film comes into contact with a part of the filament.