155results about How to "Extended propagation path" patented technology

A stator or a rotor for an electrical machine comprises a plurality of circumferentially separated, radially extending teeth, wherein each tooth having a single winding and is provided with an axially and radially extending reluctance barrier to increase the reluctance of each tooth regarding propagation of a magnetic field not interacting with the winding of said tooth.

The invention discloses a cellulose-reinforced polyurethane/epoxy resin interpenetrating polymer network hard composite foam material and a preparation method thereof, relates to a foam material and a preparation method thereof and aims at solving the problems that existing polymer formed through mutual interpenetrating of two types of polymer, namely polyurethane and epoxy resin, is poor in sound absorption property and low in mechanical property. The sound absorption property of the composite foam material ranges from 80% to 92%, and the composite foam material is prepared from polyether polyol, isocyanate, water, a foaming agent, foam stabilizer, initiator, hydrosol of nano-crystalline cellulose with the mass percentage being 1%, chain extender, a cross-linking agent and epoxy resin. The preparation method comprises the steps of firstly, mixing the polyether polyol, the foam stabilizer, the initiator, the foaming agent, the chain extender and the water with cellulose obtained after pretreatment, then adding the epoxy resin and the cross-linking agent, and obtaining a mixture; then mixing the isocyanate with the mixture, conducting stirring till bubbles are generated, leaving the mixture standing still, obtaining a foamed mixture, finally, conducting curing on the foamed mixture at the room temperature, and then conducting curing at the high temperature.

The invention relates to electromagnetic shielding paper and a preparation method thereof. The electromagnetic shielding paper is prepared from 20%-60% by mass of lignocellulose nanofibers and 40%-80%by mass of surface modified MXene, wherein surface modified MXene comprises an MXene supporter and a supported layer, and the supported layer comprises a zinc oxide phase, a carbon phase and a titanium dioxide phase. The electromagnetic shielding paper is prepared from the lignocellulose nanofibers and surface modified MXene by mixing in proportion, suction filtration, rolling and drying, and hasgood mechanical properties and electromagnetic shielding performance.

The invention belongs to the technical field of an omnidirectional circular polarized antenna and discloses a microminiature low profile omnidirectional circular polarized antenna. The antenna comprises a radiation portion, wherein the radiation portion comprises an upper medium board, four coupling plates, a circular metal ring, a circular metal disc and a center metal column, and the coupling plates, the circular metal ring and the circular metal disc are printed on an upper surface of the upper medium board. The antenna is advantaged in that four metal short circuit columns are connected between tail ends of the coupling plates and a metal floor, a current spreading path on the coupling plates is extended, the transverse dimension of the antenna is effectively reduced, and profile height is further reduced; the inner coupling plates are added in the outer coupling plates, coupling energy among antenna units is enhanced, compared with the prior art, on the condition that directional diagram performance is guaranteed, the dimension of the antenna is substantially reduced, the coupling energy among the control units can be excellently controlled through adjusting distances between the inner coupling plates and the outer coupling plates and length of the inner coupling plates, and thereby antenna work frequency is adjusted.

The invention discloses a deep high-ground-temperature roadway heat-insulation lining structure and a construction method thereof. The lining structure comprises a grouting heat-insulation ring, a primary lining heat-insulation layer and a secondary lining heat-insulation layer. Firstly, a heat-insulation grout material is injected through a hollow grouting anchor rod to form a grouting heat-insulation ring; the primary lining heat-insulation layer is distributed to form a primary support, wherein the primary lining heat-insulation layer comprises a first jet ceramsite concrete layer, a reinforcing mesh layer, a metal support and a second jet ceramsite concrete layer; after roadway deformation is stabilized, the secondary lining heat-insulation layer is constructed, and construction of the structure is completed, wherein the secondary lining heat-insulation layer comprises a third jet ceramsite concrete layer and a heat-insulation plate. By means of the structure and existing common support means and according to the current situation that deep mining high-temperature damage is severe, the stability of a roadway support structure is ensured by reasonably improving supporting materials and increasing the heat-insulation plates; by means of multiple heat-insulation measures, heat is effectively prevented from spreading into a roadway, and the application and popularization value is good.

The invention discloses a novel in-line pump dedicated motor, and the motor comprises a motor base and internal fans. The periphery of a stator iron core is fixedly provided with a plurality of axialthrough cooling tubes on the motor base, and the cooling tubes are communicated with an air outgoing cover disposed at a shaft-extension end of a rotating shaft. A bearing device is installed in a bearing seat, and comprises a bearing bush and an oil slinger, wherein the bearing bush is disposed in the bearing seat. The bearing seat consists of a bearing upper seat and a bearing lower seat. The internal fans are symmetrically disposed on the rotating shaft between the bearing device and a rotor in a fixed manner. The bearing lower seat comprises separator plates which are fixed at left and right sides of the bearing seat body. The separator plates enable the cavity of the bearing seat to be divided into a left oil pool, a central oil pool and a right oil pool, wherein the left, central andright oil pools are communicated. The oil slinger sleeves the periphery of the bearing bush, and is located in the central oil pool of the cavity of the bearing seat. A non-shaft-extension end is provided with an external fan, and is provided with a curved-path fan cover. The motor provided by the invention improves the structure of the bearing seat, improves the self-lubricating effect of a bearing, is additionally provided with the curved-path fan cover, prolongs the propagation path of air, and reduces the noise.

The invention provides a method for introducing an AAO template as a nanometer grating to a solar cell structure, and discloses a thin film silicon solar cell double-trapping-light structure with AAO nanometer gratings on the surface and the bottom. A surface decreasing structure of the double-trapping-light structure is composed of AAO and ITO, and a back reflection structure is composed of AAO, ITO and Ag. FDTD solution software is utilized for optimizing structural parameters of the AAO. According to the double-trapping-light structure, surface reflection losses of a solar cell can be effectively reduced, the light path of photons with the long wavelength in an absorbed layer can be improved, and therefore light absorption of the thin film silicon solar cell within the range of 280 nm to 1100 nm is increased, and the absorption can be relatively increased to reach 74.44 percent. Due to the fact that the AAO is easy and convenient to manufacture, low in cost and suitable for mass production, it is predicated that in the near future, the AAO will certainly play a bigger role in application of the thin film silicon solar cell.

A vibrating reed includes a vibrating body (a base portion, a vibrating arm, and a detection arm) and a support portion that supports the vibrating body via a plate-like coupling portion. In both principal surfaces of the coupling portion, grooves (a first groove and a second groove) are disposed. The first groove arranged in one of the principal surfaces of the coupling portion and the second groove arranged in the other principal surface are arranged at positions different from each other in plan view.

The invention relates to a steam exhaust device, an electric pressure cooker and an exhaust control method. The steam exhaust device comprises an exhaust assembly which consists of an on-off mechanism and an exhaust column; the exhaust column is equipped with a first exhaust hole and a second exhaust hole, wherein the first exhaust hole is communicated with a high pressure cavity in a vessel, and while the second exhaust hole is communicated with the outside; the on-off mechanism is arranged at one side of the exhaust column and can switch the on and off states; when in the on state, the on-off mechanism can form a cavity with the exhaust column, and the first exhaust hole can be communicated with the second exhaust hole through the cavity so as to guide the high pressure cavity in the vessel to exhaust steam to the outside, and a first exhaust channel can also be formed; when in the off state, the communication mechanism can separate the first exhaust hole from the second exhaust hole, so as to stop the high pressure cavity in the vessel exhausting steam to the outside. With the adoption of the steam exhaust device and the exhaust control method, the exhaust-caused noise can be reduced, and the risk of steam leakage can be decreased.

The invention belongs to the technical field of motor vehicle exhaust systems, and particularly relates to a broadband noise reduction muffler. The broadband noise reduction muffler comprises a shell, baffles and cavities, wherein the baffles and the cavities are arranged inside the shell, the baffles include the first baffle, the second baffle and the third baffle which are arranged in sequence, the cavities include the first cavity, the second cavity, the third cavity and the fourth cavity, an air inlet pipe penetrating through the front end face of the shell, the first baffle and the second baffle and an air outlet pipe penetrating through the first baffle, the second baffle, the third baffle and the rear end face of the shell are arranged inside the cavities. The first baffle, the second baffle and the third baffle are provided with a first punching region, a second punching region and a third punching region respectively. The pipe walls, on the first cavity and the second cavity, of the air inlet pipe are provided with a fourth punching region and a fifth punching region respectively. The fourth punching region is sleeved with a first sleeve. The pipe wall, on the second cavity, of the air outlet pipe is provided with a sixth punching region. The sixth punching region is sleeved with a second sleeve. The first sleeve, the second sleeve and the fourth cavity are each internally provided with a sound absorbing material.

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 disc solid laser amplifier, comprising a disc crystal unit, a reflection unit, a right-angle reflector and 2n reflection focusing units. Each reflection focusing unit is composed of a lens and a right-angle prism. A focus of the lens in each reflection focusing unit is overlapped mutually. Two reflection focusing units form a pair. The axes of the lenses are symmetric about a normal of a disc crystal center. The center of the disc crystal unit is located at the overlapped focus of each reflection focusing unit. The reflection unit is located around the reflection focusing units and is used for importing or exporting light. The right-angle reflector is located between the lenses and the right-angle prisms in the reflection focusing units. Included angles between two optical reflection surfaces of the right-angle reflector and the inclined surfaces of the right-angle prisms are 45 degrees. According to the disc solid laser amplifier, seed light is amplified through the serially connected disc crystals and lens-right-angle reflector combinations, so the technical problem that in the prior art, the amplification times of the seed light is low and the beam quality is low is solved.

The invention discloses an internally-embedded cavity-based multi-layer printed board structure comprising a plurality of line layers and an insulation layer arranged between each two adjacent line layers. According to the multi-layer printed board, at least one internally-embedded cavity for sound transferring is arranged at at least one of the insulation layer and the line layer at the inner layer; two sound holes respectively penetrating the line layer and the insulation layer at the same side of the internally-embedded cavity for sound transferring are arranged at the line layer and the insulation of the multi-layer printed board at an interval and are communicated with the internally-embedded cavity for sound transferring. According to the internally-embedded cavity-based multi-layer printed board structure, the product packaging size is reduced and the product tone quality is improved.

A method and apparatus for calculating the quantized difference between a pixel in a current frame and a pixel in a reference frame is disclosed. The apparatus of the present invention generates a “1 of n” significant difference bit output which may easily be logically OR'd with the difference values from other comparisons to determine the maximum difference over an area of pixels.

The invention relates to the technical field of psychological teaching equipment, in particular to an auxiliary tool for psychological teaching. The auxiliary tool comprises a bracket, wherein an eyepiece is arranged on the bracket, a color changing device is arranged on the bracket, the color changing device comprises a sealing box, the sealing box is fixedly connected with the bracket, a reflection mechanism is arranged at the bottom of the sealing box, an observation hole communicated with the eyepiece is formed in the sealing box, a curtain which is directly facing the observation hole isarranged on the inner wall of the sealing box; a roller which rotates transversely is arranged in the sealing box; a plurality of through holes are formed in the wall of the roller in the circumferential direction; the through holes are provided with transparent color plates; and a light source is arranged in the roller, and the light source illuminates towards the reflection mechanism. The auxiliary tool solves the problem of larger volume of color experiment tools in psychological teaching in the prior art.

The invention relates to an efficient space-extended composite sound insulation structure. The structure comprises a sound insulation base layer, and the sound insulation base layer is of a regular plate-cavity-plate composite sound insulation structure; one side of the sound insulation base layer is provided with a low-frequency sound absorption body which is of a hollow structure in a composited mode; and a continuous and bent acoustic wave passageway is formed in the low-frequency sound absorption body, and an acoustic wave inlet is formed in the side face, be back on to the sound insulation base layer, of the acoustic wave passageway. According to the efficient space-extended composite sound insulation structure, through structural design of the continuous and bent acoustic wave passageway in the low-frequency sound absorption body, the acoustic wave propagation route is prolonged, and acoustic reactance is improved; and a good sound insulation effect is achieved aiming at low-frequency noise, and by adjusting the length of the acoustic wave passageway, the different acoustic wave frequency band ranges can be aimed at.

The invention discloses a preparation method of antibacterial mildew-proof filter cotton. The preparation method comprises the following steps: (1) preparation of azido-modified nanometer titanium dioxide; (2) preparation of modified PET master batches: uniformly mixing PET slices with the azido-modified nanometer titanium dioxide, and conducting extruding and granulating to obtain the modified PET master batches; (3) melt-blowing: uniformly mixing the modified PET master batches and electret master batches, carrying out extruding and melting, feeding a formed melt to a spinning assembly for spinning, and forming fine fibers under the traction action of hot air; (4) ultraviolet irradiation: performing ultraviolet irradiation on the obtained fine fibers to obtain porous fibers; and (5) forming: carrying out web forming, electret formation and rolling on the porous fibers to obtain the antibacterial mildew-proof filter cotton. The azido-modified nanometer titanium dioxide is added into PET fibers, so the antibacterial property, the filtering property and the mechanical property of the filter cotton can be effectively improved.

A thin film solar cell having opaque and highly reflective particles and a manufacturing method thereof are provided. The thin film solar cell at least includes a substrate, a front electrode layer, a first photo-electric converting layer, a second photo-electric converting layer, and a back electrode layer. The particles are made of a highly conductive material, disposed between the first photo-electric converting layer and the second photo-electric converting layer, and distributed in a discontinuous manner. When an incident light strikes the surfaces of the particles, the incident light is reflected within the first photo-electric converting layer and the second photo-electric converting layer so as to increase the propagation path of the incident light through the first photo-electric converting layer and the second photo-electric converting layer.

The embodiment of the invention provides a refrigerator, and relates to the technical field of refrigeration or cold storage devices. The refrigerator can slow down loss of cold air in the refrigerator. The refrigerator comprises a refrigerator body, a refrigerator door and a door seal arranged between a frame of the refrigerator body and the refrigerator door. The door seal comprises a magnetic strip. Contact faces between the frame of the refrigerator body and the magnetic strip include at least one bent face.

The invention relates to a communication method of an onshore remote control submerged buoy, which comprises the following steps: placing a control transmitting end on a coast, transmitting a very lowfrequency electromagnetic wave signal by using a transmitting antenna of a vertical dipole type by using the transmitting end, and realizing long-distance cross-interface propagation of control databy side waves of the surface layer of the sea water-air interface, wherein the submerged buoy receiving end is located in seawater, a vertical electric dipole antenna with the omnidirectional horizontal direction is used as a receiving antenna, and the situation that after the submerged buoy array is disturbed by ocean current, the transmitting end is located in the restrained direction possibly occurs to the horizontal dipole antenna is effectively avoided. Therefore, the smoothness of the communication control link is ensured. The receiving end antenna uses the vertical electric dipole antenna, so that the cable space of the submerged buoy is fully utilized, the increase of the propagation path of electromagnetic waves in seawater due to the fact that the receiving antenna is distributedtoo deep along with the release device is avoided, the electromagnetic field intensity at the receiving antenna is ensured, and the reliability of a control link is ensured.

The invention discloses a stratified aluminum boron carbide compound material and a preparation method thereof. The stratified aluminum boron carbide compound material comprises n stratified structures distributed on one side of an axial plane and n stratified structures symmetrically distributed on the other side of the axial plane, wherein n is greater than or equal to 2; the stratified structures are prepared from aluminum powder and boron carbide powder. The content of the aluminum powder in the stratified structures in percentage by volume of the raw materials is increased layer-by-layer from inside to outside, increased from 50 vol.% to 100 vol.%; the content of the boron carbide powder is decreased layer by layer from inside to outside, decreased from 50 vol.% to 0 vol.%; and raw materials on two sides of the axial plane are consistent in change. According to the stratified aluminum boron carbide compound material disclosed by the invention, when the outer layer is destroyed, deformation also expands the propagation path of cracks to absorb more breaking energy, so that the integral strength and toughness of the material are guaranteed.