248results about How to "Increased bandwidth" patented technology

Disclosed is a scalable, hierarchical, distributed network architecture and processes for the delivery of high-performance, end-to-end online multimedia services, including Internet services such as World Wide Web access. The network architecture connects a high-speed private backbone to multiple network access points of the Internet, to a network operation center, to a back office system, and to multiple regional servers in regional data centers. Each of the regional servers connects to several caching servers in modified head-ends, which in turn connect via fiber optics to many neighborhood nodes. Finally, each node connects via coaxial cable to multiple end-user systems. The processes include those for replicating and caching frequently-accessed content, and multicasting content customized per region or locality.

A computer implemented method for maintaining a synchronized distributed ledger data structure across a plurality of computing nodes each configured to enforce a synchronization protocol for coordinating updates of the synchronized distributed ledger data structure to establish an inter-group reconciliation mechanism across one or more trusted entities having immutable transaction records stored in the form of blockchain data structures recording approvals from one or more parties corresponding to the plurality of computing nodes. In some aspects, regulator nodes are contemplated.

Offering vertical services to subscribers and service providers is an avenue to immediately improve the competitiveness of digital subscriber line access service, for example of the type offered by a local exchange carrier. To deliver high-quality vertical services, however, the underlying ADSL Data Network (ADN) or the like needs to establish Quality of Service (QoS) as a core characteristic and offer an efficient mechanism for insertion of the vertical services. The inventive network architecture introduces QoS into the ADN, in a manner that enables the delivery of sophisticated and demanding IP-based services to subscribers, does not affect existing Internet tiers of service, and is cost-effective in terms of initial costs, build-out, and ongoing operations. The architecture utilizes a switch capable of examining and selectively forwarding packets or frames based on higher layer information in the protocol stack, that is to say on information that is encapsulated in the layer-2 information utilized to define normal connectivity through the network. The switch enables segregation of upstream traffic by type and downstream aggregation of Internet traffic together with traffic from a local vertical services domain.

Method for controlling an input impedance of an antenna (100). The method can include the steps of coupling RF energy from an input RF transmission line (106) to an antenna radiating element (102) through an aperture (112) defined in a ground plane (110). For example, the aperture (112) can be a slot and the radiating element (102) can be a patch type element. The input impedance can thereafter be controlled by selectively varying a volume or a position of a conductive fluid (128) disposed in a predetermined region between the RF transmission line and the antenna radiating element. The volume of conductive fluid (128) can be automatically varied in response to at least one control signal (132).

The present invention aims at avoiding code limitation in a CDMA cellular mobile communication network without decrease in data transmission quality. This object is achieved through a method of scheduling a transfer of data to at least one user in a cellular mobile communication network where the transfer of data is achieved via downlink channels using codes selected from a plurality of code trees. In a first step of the method a plurality of requests (*) to access downlink channels are received until the beginning of a scheduling time interval. In a second step permissions to access downlink channels ( ) are coordinated according to the assignment of downlink channels to the different code trees (A, B).

In a first aspect, a lithography apparatus may comprise a mask designed using optical proximity correction (OPC), a pulsed laser source, and an active bandwidth control system configured to increase the bandwidth of a subsequent pulse in response to a measured pulse bandwidth that is below a predetermined bandwidth range and increase a bandwidth of a subsequent pulse in response to a measured pulse bandwidth that is above the predetermined bandwidth range. In another aspect an active bandwidth control system may include an optic for altering a wavefront of a laser beam in a laser cavity of the laser source to selectively adjust an output laser bandwidth in response to the control signal. In yet another aspect, the bandwidth of a laser having a wavelength variation across an aperture may be actively controlled by an aperture blocking element that is moveable to adjust a size of the aperture.

The present invention provides a spread spectrum clock generator that is capable of preventing phase jumps and jitters and suppressing the occurrence of Electro Magnetic Interference components and that can easily be applied to large scale integrated circuits. The spread spectrum clock generator can be configured with a filter, quantizer, fractional divider, and other elements. Also, this clock generator circuitry can be configured by combination of a delta-sigma ΔΣ quantizer and factional divider so that sine wave modulation and random number modulation can be realized. Thereby, control with digital values can be performed. This clock generator prevents precipitous phase variations in the output high frequency clock and makes fine phase control possible. Consequently, EMI reduction by 20-30 dB can be expected.

A radio-frequency surgical implement detection system detects surgical implements in a surgical wound during and at the completion of a surgical procedure. Surgical implements, including surgical sponges or laparotomy pads, gauze pads and metallic surgical instruments, are individually attached to a non battery-powered, encapsulated radio-frequency marker. The marker comprises an integrated chip having a burnt-in memory code, which is broadcast through an antenna using a modulated carrier frequency. The code is received by an interrogating antenna of a detector. The interrogating antenna provides a power pulse, which is received by the antenna of the radio-frequency marker. The power pulse charges a capacitor, which proves power for the read function, carrier frequency modulation function and broadcast function of the integrated chip, permitting each marker-containing implement to be specifically identified.

Systems that sample a continuous analog time-domain signal. The invention is particularly applicable to systems whose analog components have a bandwidth limit below that desired or specified. The invention has been created to address particular problems in the design of digital sampling oscilloscopes (DSOs) that require more bandwidth than that which is easily achievable through traditionally analog techniques. A method and apparatus are provided in the form of a digital filter that is capable of surgically increasing the bandwidth of the system beyond the bandwidth achievable in an analog system. Furthermore, it is demonstrated that this system can perform this bandwidth increase without degradation in the time-domain performance of the system such as pulse or step response. In some cases, the time-domain performance is improved by flattening of the frequency response. Additionally, the system, while boosting the bandwidth, is capable of simultaneously removing noise and therefore producing a digitized signal of higher fidelity than that obtained without the filter in place.

The invention provides a digital closed loop type optical fiber current sensor. A modulation signal of a light wave phase modulator of a sensor optical path system is an amplitude modulation square wave; a signal processing system extracts any harmonic wave of amplitude modulation square wave current output by a photoelectric transducer and extracts tested current information from the current; a pre-amplifier of the signal processing system is a transimpedance amplifier TIA, and the bandwidth is below 1 / 650 when the square wave transient amplitude value (prior art) is directly extracted from the amplitude modulation square wave, so that thermal noise output by the pre-amplifier and the shot noise level are also reduced to be below 1 / 650 of the prior art; and current-voltage conversion gain of the transimpedance amplifier TIA is not determined by the resistance of a feedback network of the TIA, so that a low-resistance resistor is adopted in the feedback network of the TIA while the high current-voltage conversion gain is ensured, and the thermal noise of the resistor which accounts for a significant proportion in the level of the noise output by the TIA is reduced to be negligible.

An LDO regulator (10) produces an output voltage (Vout) by applying the output voltage to a feedback input (6) of a differential input stage (10A) and applying an output (3) of the differential input stage to a gate of a first follower transistor (MP4) having a source coupled to an input (8) of a class AB output stage (10C) which generates the output voltage. Demanded load current is supplied by the output voltage during a dip in its value to a gate of a second follower transistor (MP5) having a gate coupled to the output of the input stage to decrease current in a current mirror (MN5,6) having an output coupled to a current source (I1) and a gate of an amplifying transistor (MN7). This causes the current source to rapidly turn on the amplifying transistor to cause it to rapidly turn on a cascode transistor (MN3), causing it to turn on a pass transistor (MP3) of the output stage.

A power generation type AC magnetic field sensor based on magneto piezoelectric effect is a laminated structure consisting of magnetostrictive rod, a piezoelectric material, the magnetostrictive rod and a permanent magnetic material; the upper surface and the lower surface of the piezoelectric material are provided with silver membrane electrode respectively, and the magnetostrictive rods is equipped with a signal output lead. The sensor can detect the alternating current without power supply, so the sensor is an energy-saving device with zero power consumption. The sensor has the advantages of small volume and low weight, can detect the AC magnetic field bandwidth ranging from 500Hz to 70kHz, and keeps a good linear relation between the output voltage and the magnetic field amplitude. The sensor adopts a thin rod structure, thus greatly reducing the volume of the sensor, enhancing the sensitivity and the bandwidth of the sensor. A bias magnetic field provided for the thin rod is greatly reduced for using small size of the magnetostrictive material, and can be integrated with a sensitive body. The sensor can be applicable to passive detection of the alternating magnetic fields.

A method for improving bandwidth of an oscilloscope involves, in preferred embodiments, use of frequency up-conversion and down-conversion techniques to achieve a system bandwidth that significantly exceeds the bandwidth attainable through interleaving alone. In an illustrative embodiment the technique involves separating an input signal into a high frequency content and a low frequency content, down-converting the high frequency content in the analog domain so that it may be processed by the oscilloscope's analog front end, digitizing the low frequency content and the down-converted high frequency content, and forming a digital representation of the received analog signal from the digitized low frequency content and high frequency content. In this manner preferred embodiments achieve the significant advantage that bandwidth may be enhanced beyond the limits associated with interleaving and the state of the art in amplifier and ADC design.

The invention discloses a method for improving offshore seismic data resolution by utilizing air gun seismic focuses of different depths. The method is characterized in that air guns are respectively arranged in positions of different depths to be excited, the near-field wavelet of each seismic focus is recorded, and a far-field wavelet is obtained through simulation; and because of the existence of an offshore strong wave impedance interface, trap points occur on the frequency spectrum of each far-field wavelet, the high-frequency information of air gun seismic focuses at superficial parts is rich, the low-frequency advantages of seismic focuses at deep parts are obvious, and periodic extension is formed. The spectral analysis is carried out on the far-field wavelets to determine the dominant frequency band of each wavelet, the high-frequency dominant section of the wavelet at a superficial part is kept unchanged, the far-field wavelet of the seismic focus at a deep part is expected to be output only at the low-frequency end, and a frequency division matched filter is obtained by calculation and then is applied to all seismic records acquired by the air gun seismic focuses at the superficial parts, thereby realizing the combination of advantages of wavelets of seismic focuses in two different depths, widening the frequency band of the offshore seismic data and improving the resolution.

A contact structure for creating the electric connection with the object on the substrate to be tested has the TAB form using spherical contactor as contact point. It has more contactors formed by the conductive line on the grounding layer and passing through the dielectric layer, and a substrate for fixing said contactors on it and electrically connecting them to external part. The said conductive line is a microstrip line with a hard boss at its end. When the contact structure is pressed on the substrate to be tested, it is curved to contact with the said boss with a friction effect.

The invention discloses a flexible capacitor type micromachining ultrasonic transducer (CMUT). The flexible CMUT comprises a flexible substrate, a lower electrode, an etching sacrificial layer, an organic polymer support layer, an organic polymer vibration thin film and an upper electrode which are arranged sequentially. The organic polymer support layer is provided with a groove, and the groove and the organic polymer vibration thin film form a cavity of the ultrasonic transducer. The invention further discloses a preparation method of the flexible CMUT. According to the flexible CMUT, ultrasonic loss caused by poor coupling is effectively reduced, and the flexible ultrasonic transducer is achieved. The flexible CMUT is suitable for detection objects, including animals' epidermal tissue, of any shapes, so that the application range of the CMUT is effectively widened. The preparation method is simple in preparation process and low in cost.

A method for communicating with a downhole tool located in a subterranean borehole is disclosed. Exemplary embodiments of the method include encoding data and / or commands in a sequence of varying drill string rotation rates and drilling fluid flow rates. The varying rotation rates and flow rates are measured downhole and processed to decode the data and / or the commands. In one exemplary embodiment, commands in the form of relative changes to current steering tool offset and tool face settings are encoded and transmitted downhole. Such commands may then be executed, for example, to change the steering tool settings and thus the direction of drilling. Exemplary embodiments of this invention advantageously provide for quick and accurate communication with a downhole tool.

The UHF detection equipment for local discharge in gas insulated combined electric appliance consists of seven parts of gas insulated combined electric appliance, leaked electromagnetic wave, UHF ultrawideband vibrator antenna sensor, coaxial RF cables, amplifying filter, high speed digital sampler, bus and computer. The present invention has effectively increased UHF detecting bandwidth and raised detecting sensitivity and S / N ratio, so that it can obtain accurate local discharge information. The present invention may be used widely in insulation state monitoring of gas insulated high voltage equipment with SF6 breaker, gas insulated cable, etc.

The invention discloses an arc voltage testing device of a pantograph catenary system. The device consists of a parallel resistance capacitive-type voltage divider, an isolation amplifier, a data acquisition card and a computer, wherein the parallel resistance capacitive-type voltage divider acquires a potential of a catenary system during off-line of the pantograph catenary system and a potential of a current-collecting pantograph sliding plate respectively, and then inputs the potential difference of the two voltage division points to the isolation amplifier for performing isolation amplification, the data acquisition card collects a voltage outputted from the isolation amplifier after isolation amplification and transmits the voltage to the computer, and the computer processes the voltage to obtain the arc voltage of the pantograph catenary system. The arc voltage testing device has strong anti-jamming capability, increases the range of tested frequency band, reduces the phase difference, and can accurately measure the arc voltage of the pantograph catenary system.

An approach is provided for managing an allocation of a bandwidth of a dedicated channel in a network being utilized by an application performing a replication of data from a first to a second storage resource. Checks of parameters specified by the application are determined. The parameters include, but are not limited to, average compression ratio, compression ratio trend, throughput, throughput trend, and round trip time. Respective high and low threshold values for the parameters are determined. At least one of the checks of the parameters is executed, which determines a violation of a threshold value for one of the parameters. If the violation of the high threshold value is determined, an increase in the bandwidth is triggered. If the violation of the low threshold value is determined, a decrease in the bandwidth is triggered.

The present invention provides an ultra-wideband energy-efficient piezoelectric vibration energy harvesting device for solving the technical problem of low energy conversion efficiency when the external vibration frequency is not stable in the prior art, including brackets and an oscillating body. The oscillating body includes a low frequency oscillating body and a high frequency oscillating body.The brackets include a top bracket, a middle bracket and a bottom bracket which are sequentially stacked from top to bottom. The three brackets adopt a three-dimensional structure with a cavity penetrating the upper and lower end faces; the low frequency oscillating body comprises a low frequency reed between the middle bracket and the bottom bracket, a low frequency mass fixed to the central bearing section of the low frequency reed, and a low frequency cantilever module attached to the cantilever of the low frequency reed; the high frequency oscillating body includes a high frequency reed between the top bracket and the middle bracket, a high frequency mass fixed to the central bearing section of the high frequency reed and a high frequency cantilever module attached to the double-cantilever beam of the high frequency reed; and the low frequency mass and the high frequency reed are connected by at least three compression springs.

The invention discloses a multi-rotor unmanned aerial plane navigation positioning system, comprising a ground positioning base station system, a ground measurement and control system and a multi-rotor unmanned aerial plane aircraft. The ground positioning base station system is used for sending difference positioning information; the ground measurement and control system receives the difference positioning information, combines the difference positioning information into remote control frames, and sends the remote control frames into the multi-rotor unmanned aerial plane aircraft; the multi-rotor unmanned aerial plane aircraft receives the remote control frames and utilizes the remote control frames to perform difference calculation to obtain positioning data; meanwhile, the positioning data is combined into remote control frames, and the remote control frames are sent to the measurement and control system to obtain high precision position information. The multi-rotor unmanned aerial plane navigation positioning system can meet multi-task requirements on accurate positioning, possess a stronger anti-interference capability, and solve the disadvantages of large positioning measurement errors and susceptibility to interference of present test systems.

The invention relates to an offshore streamer broadband wide-azimuth seismic exploration method. The offshore streamer broadband wide-azimuth seismic exploration method comprises the following steps of: establishing a three-dimensional seismic geologic model suitable for a stratigraphic structure of a target area, based on geological horizon, rock velocity and density data of the target area for previous offshore seismic exploration; optimizing the type of a wide-azimuth observation system and the aspect ratio of streamers, so as to obtain a wide-azimuth observation system type and a streamer aspect ratio that are suitable for the target area; optimizing three-dimensional curved streamer parameters, so as to obtain optimized three-dimensional curved streamer shape and streamer parameters; optimizing multi-point depth-variable random delay excitation parameters, so as to obtain excitation delay time series distribution corresponding to each synchronous source during excitation at different excitation points; in the target area, carrying out actual offshore streamer broadband wide-azimuth seismic acquisition by the three-dimensional curved streamers during multi-point depth-variable random delay excitation, so as to obtain actual acquisition mixed source shot gather records for the series of multi-point depth-variable random delay excitation.

The invention discloses a high-power laser diffraction type spatial filter. The left side of the high-power laser diffraction type spatial filter is provided with an interstage isolation filter of which the central axis is a vertical line BC, the middle of the high-power laser diffraction type spatial filter is provided with a group of gain medium of which the central axis is a transverse line CD, the right side of the high-power laser diffraction type spatial filter is provided with a multi-pass cavity filter of which the central axis is a vertical line DE, the central axis of the entire device forms a BCDEF broken line, one optical grating which enables light beams to be deflected at 90 degrees is respectively arranged at a point B, a point C, a point D and a point E, the optical gratings are separate type volume Bragg optical gratings or double-piece integrated type optical gratings, and one reflecting mirror is arranged at a point F. The invention uses an optical grating double-pass spatial filter component which does not have a lens and a pinhole and has compact appearance to replace a pinhole filter in a multi-pass amplifier, can realize the wider width of a diffraction frequency band and can meet the requirement of short-pulse and ultrashort-pulse spatial filtering; the borne laser power is higher, and the requirement of high-power laser spatial filtering can be met, thereby eliminating the probability that laser burns out the filter component because of no lens and no pinhole in the device.

A bandwidth boost system is disclosed that increases the bandwidth to a client by transmitting data over both a wireline communication path and a wireless communication path. A control system receives a request from the client over the wireline communication path for a first and second data set. The control system processes the request to generate first and second transmit instructions. The control system transfers the first data set and the first transmit instructions to a wireline transfer system and transfers the second data set and the second transmit instructions to a wireless transfer system. The wireline transfer system transmits the first data set to the client over the wireline communication path. The wireless transfer system establishes the wireless communication path with the client and transfers the second data set to the client over the wireless communication path.

The invention discloses a flexible photoinduced ultrasonic thin film transducer and a preparation method thereof. The ultrasonic thin film transducer comprises a flexible transparent substrate (120),a light absorbing layer (130) and a thermos-elastic layer (140) from top to bottom in sequence. The flexible transparent substrate (120) is transparent polydimethylsiloxanepolymers; the light absorbing layer (130) is carbon nanotubes; and the thermo-elastic layer (140) is polydimethylsiloxane polymers. The preparation method of the flexible photoinduced ultrasonic thin film transducer comprises the steps that a glass substrate is spin-coated with a polydimethylsiloxane agent, and the flexible transparent substrate is prepared; an aluminum oxide inorganic screening film deposited with a carbonnanotube filter cake is pressed onto the transparent polymer thin film prepared in the second step, the aluminum oxide inorganic screening film is peeled off, and a carbon nanotube thin film transferred with the light absorbing layer is obtained on a transparent polymer substrate; and a carbon nanotube thin film layer is spin-coated with the polydimethylsiloxane polymers, and the thermos-elastic layer is formed after solidification. After the thermo-elastic layer is solidified, the glass substrate is peeled off.

The invention discloses a frequency-adjustable and power-tunable terahertz avalanche oscillator. An oscillation cavity of the terahertz avalanche oscillator is formed by combining an upper cavity body and a lower cavity body, wherein a waveguide slot is formed in the top surface of the cavity body of the lower cavity body, and the waveguide slot is combined with the upper cavity body to form a standard waveguide cavity; an avalanche diode is assembled in a waveguide cavity in the center of the top surface of the lower cavity body through a tube base assembly thimble, the high and low positions of the avalanche diode in the waveguide cavity can be adjusted through rotating the tube base assembly thimble, and the avalanche diode is fixed through a locking nut after being adjusted in position; a spring thimble, a spring and a tunable cap disc are sequentially mounted in a tuning plunger from top to bottom, the tuning plunger assembled with the tunable cap disc, the spring and the spring thimble is screwed from an upper cavity pressure block to directly reach the waveguide cavity, and the spring enables the tunable cap disc to constantly keep physical contact with the avalanche diode in different high and low positions; the position of the tuning plunger is fixed through a piston locking nut.

The invention discloses a broadband micro-strip antenna, which belongs to the technical field of antenna. The antenna consists of a transmission feeder, a composite right / left-handed nonlinear transmission line and a medium substrate, wherein the composite right / left-handed nonlinear transmission line is connected with the medium substrate, and the transmission feeder is connected with the composite right / left-handed nonlinear transmission line. The composite right / left-handed nonlinear transmission line is formed by alternately and serially connecting at least one left-handed nonlinear transmission line and one right-handed nonlinear transmission line; the left-handed nonlinear transmission line consists of a series variable capacitor and a parallel inductor; and the right-handed nonlinear transmission line consists of a series inductor and a parallel variable capacitor. The broadband micro-strip antenna uses the composite right / left-handed nonlinear transmission line to substitute a metal conductor slice on the prior micro-strip antenna, the left-handed nonlinear transmission line has high-pass characteristic, the right-handed nonlinear transmission line has low-pass characteristic, and the composite right / left-handed nonlinear transmission line has band-pass characteristic and greatly expands the bandwidth of the micro-strip antenna.

The present invention provides a piezoelectric type multidirectional vibration energy collection device. The device solves the technical problem in the prior art that an existing piezoelectric energy collecting device is single in energy collection direction and narrow in frequency bandwidth. The device comprises a fixed seat, a bracket arranged on the fixed seat, an inner beam, an outer beam, an elastic element, a supporting rod, an annular element, a first magnetic block and a second magnetic block. The inner beam comprises a first elastic substrate, a first piezoelectric patch adhered to the fixed end of the first elastic substrate, and a first electrode adhered to the first piezoelectric patch. The outer beam comprises a second elastic substrate, a second piezoelectric patch adhered to the fixed end of the second elastic substrate, and a second electrode adhered to the second piezoelectric patch. The second elastic substrate is fixed on the bracket. The first elastic substrate, the elastic element and the supporting rod are positioned in the notch of the second elastic substrate. The first elastic substrate and the second elastic substrate are vertical to each other. The fixed end of the first elastic substrate is fixed to the free end of the elastic element and is hung on the free end of the supporting rod through the annular element.

The invention discloses a shape memory alloy spring vibration absorber containing a collision damping energy-dissipating device. The shape memory alloy spring vibration absorber comprises a vibration absorber main body and a limiting device, wherein the vibration absorber main body comprises a fixed frame, a first spring, a second spring, a mass block and a guide pillar; the two ends of the guide pillar are respectively connected with the top end and bottom end of the fixed frame; the first spring, the mass block and the second spring are successively sleeved on the guide pillar; the limiting device comprises an upper limiting part and a lower limiting part; the upper limiting part is located between the top end of the fixed frame and the mass block; the upper limiting part comprises a first limiting block, a first limiting spring and an upper limiting damper; the lower limiting part is located between the bottom end of the fixed frame and the mass block; the lower limiting part comprises a second limiting block, a second limiting spring and a lower limiting damper. The shape memory alloy spring vibration absorber can meet the vibration control requirements of different main body structures and can greatly increase the vibration absorbing effect of the vibration absorber.