212results about How to "Raise the resonance" patented technology

The invention provides a dual-polarized vibrator unit, an antenna and a multi-frequency antenna array. The dual-polarized vibrator unit includes a radiator and a balun support portion for feeding of the radiator. The radiator includes a dielectric substrate, two pairs of dipole antenna arms being disposed on an upper surface of the dielectric substrate and in orthogonal arrangement of plus or minus 45 degrees, and at least one coupling metal strap disposed on a lower surface of the dielectric substrate. Current induction is generated between the dipole antenna arms and the coupling metal strap so that a current path is formed on the coupling metal strap. The vibrator unit and the antenna thereof in the invention can achieve the ultra-broadband, high gain, high efficiency, high cross polarization ratio and high front-ratio, high isolation, low profile and low coupling and is simple and beautiful in structure, easy in engineering realization and suitable for mass production, the production cost is reduced, and the electrical performance index meets the base station antenna industry standard.

The invention discloses a resonance enhanced wireless power transmission structure with high resonance frequency stability, and relates to the technical field of wireless power transmission. According to the wireless power transmission structure provided by the invention, the change of a coupling coefficient and a load cannot influence the resonance frequency, the primary side works at a constant frequency, the voltage and the current are same in phase, and the design of an absorption circuit and a soft switch is easily realized; due to a secondary-side impedance adjusting circuit, on one hand, the whole back-stage omega 0 frequency component of a rectifier bridge is purely resistive and the load change is guaranteed not to influence the resonance frequency, and on the other hand, the output voltage is stable and the power supply demand of the back-stage load is met; meanwhile, compared with an existing secondary-side wireless power transmission structure, the secondary-side structure proposed by the invention has relatively high resonance value Q, so that the resonance is enhanced, the transmission power under the weak coupling condition is increased, and the transmission efficiency under the weak coupling condition is improved. The resonance enhanced wireless power transmission structure is suitable for wireless power transmission occasions.

The invention provides a silver nano superstructure array. The silver nano superstructure array is arranged on the surface of a substrate. The invention also provides a preparation method for the silver nano superstructure array. The preparation method comprises the following steps of: putting a patterned silicon wafer into a silver ion-cysteine complexing solution with the pH value of 10.0 to 11.0; and culturing the patterned silicon wafer at the temperature of between 4 and 45 DEG C for 1 to 3 days to obtain the silver nano superstructure array. The invention further provides application ofthe silver nano superstructure array to surface enhanced Raman spectrum (SERS) detection and solar batteries. The silver nano superstructure array prepared by the method has high sensitivity and highly uniform SERS detection effect.

The invention relates to the field of kinetic energy power generation of electric automobiles, in particular to a method. According to the method, when a spring upper automobile body with a vertical elastic system vibrates in the running process of an electric automobile, a spur rack vertically fixed in the spring upper automobile body is meshed with a gear which is arranged on another elastic vibrating body and in which a unidirectional bearing is sleeved, the elastic vibrating body is unidirectionally and synchronously driven to be subjected to forced frequency resonance or effective vibration to generate kinetic energy, and a kinetic energy power generation device arranged on the elastic vibrating body generates power by using the generated kinetic energy.

The invention discloses a multi-band antenna device and a hand-held terminal with the same. The multi-band antenna device comprises a metal mainboard and an antenna body which is connected with the metal mainboard. The antenna body comprises a first antenna branch and a second antenna branch, one end of the first antenna branch is connected with the feed end of the metal mainboard, and the other end of the first antenna branch is connected with a first switch. One end of the first switch is in switching connection with the second antenna branch and the ground end of the metal mainboard, and the second antenna branch is connected with the ground end of the metal mainboard through at least one second switch. The first switch and the second switch are used, so that at least two annular antenna loops are ingeniously achieved on the same antenna body, the purpose that the single antenna body works for multiple bands in a switching mode is achieved, the space occupied by the multi-band antenna device is greatly lowered, and the weakening degree to the antenna performance can be greatly lowered when a human hand touches a metal decorative piece.

A DC voltage value from a DC voltage detection unit (201) is directly inputted to a voltage correction unit (202) without using a compensator or a filter. Accordingly, a voltage correction unit (202) can rapidly perform a correction process even upon a sudden voltage change such as an instantaneous power supply stop, an instantaneous voltage lowering, or a recovery from an instantaneous voltage lowering. Moreover, since a limit unit (212) limits a link resonance compensation amount to a predetermined range, it is possible to prevent an excessive fluctuation of a link resonance compensation amount upon a sudden voltage change. Moreover, the link resonance compensation amount limited to the predetermined range by the limit unit (212) is inputted to a compensator (206) of an appropriate control band in control calculation units (204 - 208). Accordingly, it is possible to avoid response of a higher speed than is necessary and perform stable control.

The invention discloses a functional food far infrared box type drying system. The functional food far infrared box type drying system comprises a drying box body, wherein an infrared drying layer is mounted in the drying box body, and is connected with an infrared control system; and the infrared drying layer has a face-shaped infrared radiation emitting layer. The functional food far infrared box type drying system uses a far infrared resonance effect for drying agricultural products, and uses partial matching between an infrared wavelength peak of heating bodies and an infrared wavelength peak of the agricultural products to be dried for effectively retaining single nutritional ingredients of the agricultural products so as to realize the drying of functional foods.

The invention discloses a graphene SPP propagation device of a periodic grating structure. The device is characterized by comprising a silicon dioxide substrate layer and a graphene layer, and a periodic grating structure is etched on the upper surface of the silicon dioxide substrate layer; an organic dye gain medium is arranged in the ridge of the periodic grating structure; the graphene layer is of an array nanobelt structure; the upper surface of the silicon dioxide substrate layer is in lap connection with the graphene layer of the array nanobelt structure. According to the graphene SPP propagation device of the periodic grating structure, SPP resonance can be enhanced, the periodic graphene SPP waveguide propagation distance is increased, the structure is simple, and the device is easy to realize.

The invention discloses a supported bimetallic catalyst for CO catalytic oxidation through visible light at the room temperature and a preparation method and applications thereof. Au and Ag nanometer particles absorbing visible light are used as active components to be supported on TiO2 carriers to prepare the supported bimetallic catalyst. The supported bimetallic catalyst is prepared through two steps: preparing intermediates containing Ag, and preparing the supported bimetallic catalyst containing Au and Ag. Afterwards, visible light is led in a reaction system to improve photo-catalysis performances of the catalyst for CO catalytic oxidation. The catalyst can be used for removing CO at the room temperature. Compared with a single supported Au catalyst, the promotion effect of visible light on CO catalytic oxidation by the Au and Ag bimetallic catalyst is improved apparently (that is, the utilization efficiency of the visible light is improved), and the catalyst preparation method is simple and easy to implement, low in cost and is good for being popularized and used.

The invention discloses a content related advertisement distribution method based on video hot descriptions. The content related advertisement distribution method comprises the steps of: (1) according to an interactive encyclopedia classification tree, establishing a video classification tree; (2) establishing a training model of each classification of advertisement on the video classification tree by using a support vector machine; (3) acquiring unprocessed advertisement from a database to obtain an advertisement title and an advertisement description corresponding to each piece of advertisement; (4) training the advertisement title and the advertisement description by using the training model to obtain the probability of each classification of the advertisement on the video classification tree; (5) manually correcting the probability to obtain the corrected probability result; (6) acquiring the unprocessed hot videos and key word descriptions thereof from the database; (7) according to the hot videos and the key word descriptions thereof, obtaining the probability of each classification of each hot video on the video classification tree; and (8) carrying out similarity calculation on the probability of each classification of each hot video on the video classification tree and the probability of each classification of the advertisement on the video classification tree.

A drum comprises a drum body made of at least one fiber layer. The drum body is provided with a drumhead at each of two opposite ends thereof. The drumheads are positioned on two reinforced frames disposed at both ends of the drum body by two drum hoops, so that the contact area between the drumheads and the drum body can be reduced through the reinforced frames. In addition, the reinforced frames reinforce the structure and maintain the shape of the drum body. Plural positioning screws are inserted through the periphery of the respective drum hoops, and the drum body is provided with plural fixing members to be screwed with the positioning screws. By such arrangements, the drum not only has the advantages of reinforced structure, light weight and easy production but exert a better resonance effect, making the sound produced by the drum more robust and powerful.

Phononic metamaterials and methods for reducing the group velocities and the thermal conductivity in at least partially crystalline base material are provided, such as for thermoelectric energy conversion. In one implementation, a method for reducing thermal conductivity through an at least partially crystalline base material is provided. In another implementation, a phononic metamaterial structure is provided. The phononic metamaterial structure in this implementation includes: an at least partially crystalline base material configured to allow a plurality of phonons to move to provide thermal conduction through the base material; and at least one material coupled (e.g., as an inclusion, extending substructure, outer matrix, a coating to heavy inner inclusion, etc.) to the at least partially crystalline base material via at least one relatively compliant or soft material (e.g., graphite, rubber or polymer). The inclusion, extending substructure matrix or coating material is configured to generate at least one vibration mode by the oscillation of at least one atom within the resonating material to interact with the plurality of phonons moving within the base material and slow group velocities of at least a portion of the interacting phonons and reduce thermal conductivity through the base material.

A surface acoustic wave device includes interdigital transducer (IDT) electrode and reflectors disposed on a piezoelectric substrate. Each of the IDT electrode and the reflectors has a multi-layer film structure including at least one layer (high specific gravity metal component containing layer) including as a major component a metal with a specific gravity of at least about 15 and having a film-thickness of at least about 10 nm, and at least one layer (low specific gravity metal component containing layer) including as a major component a metal with a specific gravity of up to about 10 and a volume resistivity as a bulk value (at about 20° C.) of up to about 10×10⁻⁸ Ω·m, and having a film-thickness of at least about 10 nm. For example, the multi-layer structure includes an Ni film (low specific gravity metal component containing layer) with a film-thickness of about 150 nm disposed on a Ti film, a Cu film (low specific gravity metal component containing layer) with a film-thickness of about 250 nm disposed on the Ni film, and an Au film (high specific gravity metal component containing layer) with a film-thickness of about 50 nm disposed on the Cu film.

The invention relates to a windbell-type piezoelectric power generation device and belongs to the field of piezoelectric power generation. The windbell-type piezoelectric power generation device is formed by hanging a plurality of rod assemblies in an array-type mode; each rod assembly includes at least two rigid rods (1) from top to bottom, the rigid rods (1) are connected through flexible joints (2), and the side wall of each flexible joint (2) is at least provided with one piezoelectric unit (3) in an attached mode. The rigid rods (1) are connected through the flexible joints (2) provided with the piezoelectric units (3) in the attached mode to form the rod assemblies. Each rod assembly in a hanging state has a plurality of bending resonant frequencies, and the rod assemblies will perform bending resonance when a driving frequency is close to a certain resonant frequency; when incoming flow passes by the rod assemblies on a windward side, the rod assemblies bend, Karman vortex streets are generated behind the rod assemblies, and the adjacent Karman vortex streets in the array have phase differences which jointly act on the rod assemblies and excite the rod assemblies to generate resonance. According to the windbell-type piezoelectric power generation device, the utilization rate of incoming flow kinetic energy is improved by utilizing the array-type structure, and the electromechanical conversion efficiency of the system is improved by utilizing the resonance; the windbell-type piezoelectric power generation device has the advantages of being insensitive in incoming flow direction and wide in flow rate range.

The invention relates to the technical field of surface enhanced Raman scattering active substrates, in particular to an Au-Au dimer array structure and a preparation method and application thereof. The invention discloses an Au-Au dimer array structure, which comprises a substrate and an Au-Au columnar dimer structure arranged on the substrate in an array; the Au-Au dimer array structure is characterized by comprising first gold particles, a silicon dioxide interlayer and second gold particles, wherein the three parts sequentially extend upwards from the substrate. When the Au-Au dimer arraystructure is used for an SERS substrate, a Raman signal is stable, and the repeatability is good; adjacent particles generate coupling of localized surface plasmas, so that plasma resonance is enhanced; and a stronger SERS effect is generated by being compared with single particles.