470 results about "Frequency wave" patented technology

A wireless, remote, programmable keyboard input system for computers is provided. A single receiver is capable of simultaneous receipt of RF ID-Code transmissions from multiple remote transmitters, is plugged into the keyboard port of the central processing unit of a computer. The computer's standard keyboard is then plugged into the receiver and remains fully functional. The RF ID-Code of each button of each remote hand held transmitter is a unique fixed code. The receiver in this system is programmed by associating, in the receiver's memory, a unique transmitter button ID-Code with the scancode or modified scancode of a key or modified key from the standard keyboard of the computer. When the receiver, in the operation mode, recognizes that RF ID-Code from that transmitter button, it pulls the associated scancode or modified scancode from its memory and sends it off to the CPU of the computer. When several such previously programmed RF ID-Codes are sent to the receiver in succession, the receiver recognizes them in sequence and sends the corresponding scancodes or modified scancodes off to CPU in that same sequence. The invention can operate using either radio frequency or infrared frequency waves. A method of programming the system is also provided.

A method for performing pre-stack time migration of seismic data in a region where the subsurface seismic wave propagation velocity varies in both the vertical direction and a horizontal direction. The migration is performed in the wave number—frequency domain and involves using travel time maps to find a linear fitting of the migration phase shift for a given ray parameter and at a given vertical depth versus horizontal position. The slope and intercept parameters from the linear fit are used to adjust a known pre-stack time migration equation, with the accuracy of the linear approximation requiring mild horizontal velocity variation.

The invention relates to an ultrahigh metallic resistance composite multi-frequency wave-absorbing material and belongs to the technical field of wave-absorbing materials. The technical problems that in the prior art, a circuit simulation wave-absorbing structure is narrow in wave-absorbing bandwidth, single in wave-absorbing frequency band and large in relative thickness are solved. The wave-absorbing material comprises a frequency selecting surface, a medium layer and a metal bottom plate. The frequency selecting surface is composed of patch units arrayed periodically, and each patch unit comprises a square patch, a first square surrounding patch and a second square surrounding patch, wherein the square patch, the first square surrounding patch and the second square surround patch are sequentially arrayed from inside to outside according to the length of sides. The wave-absorbing material further comprises four L-shaped patches which are symmetrically arranged outside four right angles of the second square surrounding patch. The double-frequency or triple frequency wave-absorbing characteristic that the reflection coefficient, below -10dB, of the wave-absorbing material is adjusted within the 4 GHz-18 GHz range can be achieved, the reflection coefficient of about -20 dB can be achieved nearby a wave-absorbing harmonic peak, and therefore a higher wave-absorbing effect is achieved.

The invention relates to a method for measuring fault location of a HVDC transmission line under consideration of measured wave velocity; the method is characterized by comprising the following steps: considering the variation characteristic of the wave velocity on the basis of the traditional dual-end location measuring method, and performing the calibration of a wave tip and the determination of the wave velocity in the same process; respectively acquiring the positive and negative data of the voltage of the HVDC transmission line by means of devices at two ends of the line; after the data is subjected to filtering processing and line-mode conversion, analyzing the obtained line-mode traveling wave, obtaining a time-frequency oscillogram of signals and determining the arrival time of the fault traveling wave to two ends of the line as well as a corresponding instantaneous frequency value; obtaining the corresponding line-mode wave velocity by using frequency-wave velocity curves; and finally, obtaining the fault distance by means of a dual-end distance measurement formula.

A radio transmitter system responsive to a binary signal drives a narrow bandwidth VLF or LF antenna. A generator derives a first variable frequency wave frequency coded based on bit values of a binary signal. An arbitrary impulse response signal processor responsive to the first wave derives a first output signal having real and imaginary components representing the shape of a modulating wave having a variable amplitude envelope and the frequency of the coded values. A transmitter responsive to the processor output signal and a VLF or LF carrier supplies the antenna with another output signal including a modulation wave having a shape that is a substantial replica of the modulating wave shape. The processor causes the signal emitted by the antenna system to include modulation having a shape that is substantially the shape of the first wave.

The invention relates to a millimeter wave imaging method and system. A first millimeter wave antenna array and a second millimeter wave antenna array transmit continuous frequency waves to an arc middle area and receive returned millimeter waves. The first millimeter wave antenna array and the second millimeter wave antenna array move in the vertical direction so as to transmit and receive the millimeter waves in the vertical direction of the arc middle area. An image processing module carries out image combination on the millimeter waves received by a first millimeter wave receiving and transmitting module and a second millimeter wave receiving and transmitting module so that a three-dimensional image of an objected to be imaged can be formed in the arc middle area. According to the millimeter wave imaging method and system, a detecting mode of combining translation scanning of vertical mechanical driving of switch antenna arrays and arc direction scanning is adopted, all-dimensional scanning of the human body can be effectively finished, and the safety inspection efficiency is improved.

Tableware (F) put inside a heating chamber (20) of the disclosed heat cooking device (1) is heated by means of high-frequency waves, steam, hot air, or a combination thereof. The heating chamber is provided with a circulating fan (51) and an air supply/emission fan (31). An air supply tube (36) to the heating chamber and an air emission tube (37) from the heating chamber are provided to a blowing duct (33) that links the air supply/emission fan and an emission port (32). An ion generator (44) is disposed at the air supply tube. A duct switching device (40) that selects whether to introduce positive/negative ions generated by the ion generator into the heating chamber or to release the ions to the outside of the heat cooking device is provided to the air supply tube and the air emission tube.

The invention provides a method employing surface wave information in seismic records to investigate a surface structure. The method employing surface wave information in the seismic records to investigate the surface structure comprises steps that: step 1, original data is inputted, and original data processing is carried out; step 2, surface wave waveform extraction of the data processed in the step 1 is carried out in a frequency wave-number domain to acquire surface wave frequency dispersion data of base-order components; step 3, data stack of the surface wave frequency dispersion data acquired in the step 2 is carried out in a distance frequency domain to form a frequency dispersion file; and step 4, inversion fitting of the frequency dispersion file acquired in the distance frequency domain in the step 3 is carried out to acquire a stratum model integration accomplishment graph. The method employing surface wave information in the seismic records to investigate the surface structure settles a problem of strict requirements for a stratum speed and wave impedance existing in a traditional surface structure method and can acquire accurate shallow surface thickness and the speed data.

The invention discloses a magnetic coupling resonance wireless power supplying device using fundamental wave energy in a high-frequency square wave and belongs to wireless energy transmitting device. The magnetic coupling resonance wireless power supplying device comprises a control circuit, a drive circuit, an emitting circuit and a resonance receiving circuit. The emitting circuit comprises an input power supply and a non-resonance converter connected with the input power supply and comprising an emitting coil. The resonance receiving circuit comprises a receiving coil, a resonance capacitor and a load. The magnetic coupling resonance wireless power supplying device directly controls a square wave voltage frequency of the emitting coil in the non-resonance converter. When the square wave voltage frequency is identical with resonance frequency points of the receiving coil, the magnetic coupling resonance wireless power supplying is achieved. Two coils which share the same resonance point frequency are not needed for achieving resonance working and reliability of a wireless electric energy device is improved. ZVS switching in a total range is easy to achieve. EMI interference is low and an application prospect is wide.

The invention relates to a method of using radio frequency waves to artificially create catalytic action in a catalyst-free chemical reaction within a substance. To mimic or imitate the catalyst, radio frequency waves are transmitted through the substance at a signal strength sufficient to electronically reproduce the effect of the physical presence of a selected catalyst. The radio frequency waves have a selected transmission frequency substantially equal to a catalyst signal frequency of the selected catalyst, defined as the signal frequency determined by nuclear magnetic resonance of the selected catalyst. It is commonplace to use nuclear magnetic resonance to identify elements within a substance and the signal frequencies of various elements (including catalysts) are listed in widely published tables. To date, the mechanism by which catalysts bring about chemical reactions has been unknown. The inventor has recognised that the physical presence of a catalyst brings about a chemical reaction due to the emission of low intensity radio frequency waves from the catalyst with the signal frequency that is emitted being the signal frequency of the catalyst that is commonly determined by nuclear magnetic resonance. Therefore, the invention can be used to eliminate the need for expensive metallic catalysts, such as platinum. The invention electronically reproduces the effect of the physical presence of a catalyst by transmission of a radio frequency wave with a signal frequency equal to that signal frequency emitted by the catalyst and as determined by nuclear magnetic resonance of the catalyst.

The invention discloses an embedded composite meta-material absorber. The absorber is composed of periodical unit structures. Each unit structure is composed of a dielectric based superstructure, a patterned absorbing material and a metal backboard, wherein the dielectric based superstructure is composed of a metal pattern and a dielectric body, and the patterned absorbing material is a seamless fit with the dielectric based superstructure and embedded into the dielectric body under the metal patter to form an embedded structure, and the embedded structure is combined with the metal board in the vertical direction to form one unit structure. Due the embedded structure design, the problem that a present absorbing material is low in the low-frequency absorbing performance in an ultrathin state is solved, the high-frequency performance of the magnetic absorbing material is maintained to the largest degree, and brand new design ideals and methods are provided for ultrathin low-frequency ultra-wide-band absorbers, intelligent adjustable wave absorption, and ultrathin, ultralow-frequency wave absorption in future.

The invention discloses an absorption and transmission integrated frequency selective surface with high-frequency broadband wave absorption and low-frequency wave transmission functions; the surface comprises a top absorption layer, a middle resonance layer and a bottom resonance layer; a first dielectric substrate is arranged between the top absorption layer and the middle resonance layer, and a second dielectric substrate is arranged between the middle resonance layer and the bottom resonance layer. Each layer comprises a plurality of metal patch units, and each unit of the top absorption layer is composed of a resistive Jerusalem cross structure; each unit of the middle resonance layer is composed of square ring type metal strips, circular metal sheets and a square metal strip, the square metal strips are connected with the circular metal sheets through rotational symmetry, and the circular metal sheets are distributed in an axial symmetry mode; each unit of the bottom resonance layer is formed by combining circular metal sheets and square metal strips, and the circular metal sheets and the square metal strips are respectively distributed in an axial symmetry manner; the top absorption layer is connected with the first dielectric substrate; and the middle resonance layer, the second dielectric substrate and the bottom resonance layer are connected. The surface is excellent in wave-absorbing performance.

The invention relates to a pressing method for using three-dimensional seismic data to process linear noise of the three-dimensional seismic data, belonging to the oil geophysical exploration field. The concrete steps are that: high density seismic data is collected and recorded; the data is divided into data groups with smallest data sets; rank ordering is carried out on all paths of each data group according to the shot-geophone distance and the azimuth, thus forming a three dimensional denoising smallest data set; the linear noise speed is analyzed according to the formed frequency wave-number spectrum (FK spectrum) or the original seismic data so as to eliminate the linear noise; pressing on the existing linear noise is repeated until the noise is eliminated. The pressing method is applicable to different seismic data collected by observation systems, in particular to non-cross banding and irregular bunchy orthogonality observation system, thus pressing the linear noise of the original data well.

The invention discloses a method for preparing a core-shell type barium titanate/polyaniline composite wave-absorbing material. The method comprises the following steps of: adding an alcohol/water solution of a silane coupling agent into water dispersing agent of a nanometer barium titanate powder body; slowly dipping a hydrochloric acid solution of phenylamine; and finally dipping a hydrochloric acid solution of ammonium persulfate, and reacting to prepare the core-shell type barium titanate/polyaniline composite wave-absorbing material. Surface finishing on the nanometer barium titanate powder body is performed by using the silane coupling agent, so that polyaniline forms a good covering layer on the surface of barium titanate; and the prepared core-shell type barium titanate/polyaniline composite material has dielectric loss and magnetic loss; and because of specific magnetoelectric effect of the core-shell structure, the wide frequency wave-absorption performance of the material is obviously improved; the maximum reflectivity of the material is minus14.5dB in the range of 0-6GHz and is superior to minus 5dB and minus10dB; and the bandwidths are 1,200MHz and 750MHz respectively.

The invention discloses a self-adaptive single-frequency narrow-band interference trapped wave filtering device and double-frequency filtering equipment. The self-adaptive single-frequency narrow-band interference trapped wave filtering device comprises a self-adaptive single-frequency trapped wave filter, a single-frequency interference signal frequency estimating and updating unit, an input signal and interference signal energy estimation unit and a self-adaptive single-frequency trapped wave filter output selection device. The double-frequency filtering equipment comprises two self-adaptive single-frequency narrow-band interference trapped wave filtering devices which are in cascade connection with each other and an auxiliary trapped wave filter. The self-adaptive single-frequency narrow-band interference trapped wave filtering device is expanded to a self-adaptive double-frequency wave trap and has a flexible hardware structure to achieve different functional combinations, that is, one or two single-frequency narrow-band interference signals are removed in a self-adaptive mode, so that the deviation of an estimated value of the narrow-band interference frequency is small, and the wave trapping effect is good.