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

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.

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 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 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 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.

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.