160results about How to "Avoid asymmetry" patented technology

The invention is an apparatus used for measuring flexible material flexural fatigue, with property of being consisted of crank block rack mechanism, force and displacement sensor, upper and lower cartridge, optical plummet centering system, up-and-down and rotation driving system and control circuit, program and signal collection system, finishing measurement of fixed point flexural fatigue and relaxation creep behaviour of flexible material with stationary load and stretch effectively and accurately. The index property measured are endurance failure time, endurance limit strength and limiting strain, relaxation time, sample thickness or diameter. The apparatus has simple but practical structure, convenient installation and replacement, many tunable parameters containing sample length, fixed points position and their distance, bending rotational angle and angular frequency, original load and stretch, accurate measurement, and can avoid influence of move of application point in bending, offset of sample and vibration.

A magnetic resonance antenna has longitudinal antenna rods in a birdcage structure, and antenna ferrules connecting the longitudinal antenna rods at their ends in terms of radio-frequency. The magnetic resonance antenna has a number of radio-frequency switching elements that interrupt, in terms of radio-frequency, at least one part of the longitudinal antenna rod to detune the eigen-resonance frequency of the antenna with respect to an operating magnetic resonance frequency. For this purpose, the magnetic resonance antenna is provided with two switching lines, directed to the radio-frequency switching elements from outside of the birdcage structure, the switching lines having a ring line connected thereto running annularly on or in the birdcage structure and transverse to the longitudinal antenna rods.

The invention discloses a power supply management chip for controlling a two-phase Buck circuit having a current equalization function based on COT. The power supply management chip is provided with a power supply input pin, an output voltage pin, a grounding pin and two switch SW pins. The chip is internally provided with a reference circuit module, a comparator module, a voltage ring module, a clock generation module, a control logic and soft start module, a constant conduction time generation module, a ripple compensation module, a current sampling module, a current equalization module, a driving module and four in-chip switching tubes. According to the power supply management chip, multiple asymmetric factors can be effectively overcome to realize current equalization so that the precision is high, the power supply management chip can work under high switching frequency, and energy loss is less and area occupation is smaller in comparison with the conventional method of digital control matching duty ratio.

An optical absorption gas sensor comprising a body having an internal wall which defines a chamber, at least one aperture in the body through which a gas sample can enter the chamber, a light source, at least one reflector, a detector assembly which extends into the chamber and has a first side and an opposite second side, a detector which measures light which is incident at at least a range of angles on at least a part of a first surface of the detector assembly on the first side of the detector assembly, wherein the light source is located within the chamber on the second side of the detector assembly, the whole being configured such that light from the light source passes through the gas sample and is reflected around the detector assembly, by the at least one reflector, onto the detector.

A fully integrated CMOS multi-element phased-array transmitter (transmitter) includes, in part, on-chip power amplifiers (PA), with integrated output matching. The transmitter is adapted to be configured as a two-dimensional 2-by-2 array or as a one dimensional 1-by-4 array. The transmitter uses a two step up-conversion architecture with an IF frequency of 4.8 GHz. Double-quadrature architecture for the up-conversion stages attenuates the signal at image frequencies. The phase selectors in each transmitter path have independent access to all the phases of the VCO. The double quadrature architecture results in two sets of phase selectors for each path, one for the in-phase (I) and one for the quadrature phase (Q) of the LO signal. The phase selection is done in two stages, with the first stage determining the desired VCO differential phase pair and the next stage selecting the appropriate polarity. An on-chip Balun is used for differential to single-ended conversion.

The invention discloses a conductor wire core aluminum alloy for a welding machine cable and a making method thereof. A conductor wire core is made of aluminum alloy materials. The aluminum alloy comprises the following compositions: 0.4-1.0wt percent of Fe or Co, 0.1-0.5wt percent of Cu, 0.1-0.5wt percent of Mg, 0.05-0.1wt percent of Be and 0.05-0.1wt percent of rare earth. An aluminum alloy wire harness is obtained by carrying out smelting, linecasting, rolling, intermediate annealing, drawing, bunch stranding and annealing on the alloy. The aluminum alloy wire core has the advantages of better conductivity, anti-fatigue performance, flexibility, bending performance and corrosion resistance and is suitable for the conductor wire core of the welding machine cable.

The invention provides a barcode-based communication method comprising: rendering first transmission information as a first barcode, and displaying the first barcode to be scanned by a peer device; scanning a second barcode displayed by the peer device and obtaining second transmission information carried by the second barcode, wherein the second transmission information is obtained by the peer device based on the processing result of the first transmission information. The method enables two communication parties to carry out bidirectional information transmission with the barcodes, avoids the information asymmetry caused by unidirectional communication, and enhances service integrity and the security.

A resonant switching power converter having burst mode transitioning operates during low or zero load conditions with reduced audible noise and component stresses, while improving efficiency. Pulse bursts are generated with a beginning and/or ending pulse duration that differs from mid-burst pulse durations, in order to reduce an amplitude of transients otherwise generated at the beginning and/or end of the bursts. Alternatively, the spacing between the pulses at the beginning and/or end of the bursts may differ from the spacing between the pulses in the middle of the bursts to reduce the transient(s). A number of pulses at the beginning and/or end of the burst can also be set with gradually varying durations, to further reduce component stress and audible vibration in a transformer that couples the resonant tank to the output of the converter.

The invention provides a heating system and a control method thereof. The heating system comprises a heat pump unit, and a heating terminal arranged in a room. The heating terminal is connected with the heat pump unit through a water pipe. The heat pump unit comprises a controller. The output end of the controller is electrically connected with a compressor. The input end of the controller is electrically connected with a temperature controller. The temperature controller is arranged in the room. The temperature controller collects the temperature in the room to generate a temperature signal through calculation, the temperature signal is transmitted to the controller, and the controller controls the operation frequency of the compressor so as to control the water temperature in the water pipe. The control method of the heating system is based on the heating system. The indoor temperature collection is regarded as the control target, the supply water temperature is further controlled, the situation of disproportion of room loads and water temperature changes is avoided, and thus the user operation control cost is reduced.

The invention discloses a high-accuracy distributed optical fibre time synchronization system. The high-accuracy distributed optical fibre time synchronization system comprises an optical fibre time synchronization centre, a passive light distribution network and a plurality of optical fibre time synchronization units, wherein the optical fibre time synchronization centre is located at the combining end of the passive light distribution network, and each of the optical fibre time synchronization units is located at each branching end of the passive light distribution network. According to the high-accuracy distributed optical fibre time synchronization system disclosed by the invention, point-to-multipoint connection and connection control are realized by the passive light distribution network and a time division multiple access technology, and high-accuracy time comparison among points is realized by virtue of a bidirectional time comparison method, thus realizing high-accuracy distributed time synchronization.

The invention belongs to the communication technology, and provides a system and method of assigning homework by a teacher. The system comprises: a homework assignment device used for selecting a student information list for homework assignment, and sending homework assignment information, wherein the student information list is corresponding to the ID information of the homework assignment device; a homework obtaining device used for receiving the homework assignment information, and comprising a student terminal and a parent terminal; and a homework server used for searching for and sending the student information list corresponding to the ID information of the homework assignment device according to the ID information, and receiving and sending the homework assignment information to the student information list for homework assignment, and a parent information list corresponding to the student information list. The system and method solve the problem of homework assignment information asymmetry, reduce teacher workload, and avoid repeated sending of homework assignment information by teachers.

The invention discloses an online automatic power distribution method and device. The method comprises the steps that a first voltage value corresponding to a phase-A line in a three-phase electric transmission line, a second voltage value corresponding to a phase-B line in the three-phase electric transmission line, a third voltage value corresponding to a phase-C line in the three-phase electric transmission line and a fourth voltage value corresponding to a power supply line of a single-phase user are collected; the first voltage value, the second voltage value and the third voltage value are compared with one another, and the largest voltage value is determined; the difference value of the largest voltage value and the fourth voltage value is calculated, and whether the difference value is zero or not is judged; if the different value is zero, no power distribution instructions are generated, and the original power distribution state is kept; if the difference value is not zero, a power supply of the single-phase user is switched to the phase line corresponding to the largest voltage value. According to the online automatic power distribution method and device, power utilization balance on the three-phase branch circuit can be ensured to the maximum through the power supply distribution strategy, practicability and computational efficiency are high, the three-phase load dissymmetry can be reduced to the maximum, low-voltage electric transmission side line damage is reduced, and power supply safety, reliability and efficiency are improved.

The invention discloses a cell reselecting method, comprising the following steps of: locally searching for whether a reselection threshold parameter of reselection from a target cell to a source cell exists when the source cell determines that UE (User Equipment) satisfies the initial reselection condition of reselection to the target cell; if not, reselecting the UE to the target cell; and if the reselection threshold parameter exists, further determining whether the corresponding parameter of the UE in the source cell is smaller than or smaller than or equal to the reselection threshold parameter; and if the corresponding parameter is greater than the reselection threshold parameter, not reselecting the UE to the target cell, otherwise, reselecting the UE to the target cell. The invention also discloses a cell reselecting device and a base station. By the technical proposal provided by the invention, asymmetry of the reselection policies between a TD (Time Division) cell and a GSM (Global System for Mobile Communications) cell is avoided, ping-pong reselection between the TD cell and the GSM cell is prevented, the paging breaking time of the UE in the reselection period is shortened, the network load is reduced and the UE becomes energy-saving.

The present invention relates to a kind of cable conductor of recognition function, the preparation method of such a cable and conductor, and their forming device. The conductor has the characteristic of over one grooves on the single conductor surface extend along axial direction of the conductor. The grooves which can be formed through roller pressing are both easy in process and unique in recognition. It is very easy to recognize when the stolen cable being stored and sold, thus the evidence of stealing is provided. In addition, the grooves which are formed on the conductor surface by roller pressing can adapt to high speed of wire traveling. The cable production will have fast speed and high efficiency, and can run with wire twist simultaneously or before wire collection of single conductor. The present invention will not introduce obviously increase of production cost; the produced grooves are smooth and have good straightness which will not lead to snake-like grooves and eliminate point discharge or electric corona of the grooves. The mold of roller is easy to make, hard to wear and has a long service life, which specifically suits for the forming of various sizes of single conductor grooves.

The invention provides a wafer etching device and method, and relates to the technical field of semiconductors, wherein the device and method are used for improving the etching uniformity of a wafer, and improving the yield of an integrated circuit. The device comprises an etching cavity and a placement platform which is disposed in the etching cavity and can rotate. The placement platform is used for bearing the wafer, and at least rotates clockwise for one circle and anticlockwise for one circle in the etching process of the wafer. The device provided by the invention is used for the etching of the device.

The invention relates to a multi-energy microgrid distributed scheduling method based on a potential game, which can give consideration to the benefits of different energy operators, can improve the decision autonomy of the energy operators, and can model the scheduling problem of a multi-energy microgrid system with electric energy, gas energy, G2P, P2G, energy storage and other devices into a game problem among subnets. A multi-energy microgrid scheduling model based on a potential game is established, and a potential function is constructed; and according to the method, the autonomy and economy of each subnet in the multi-energy microgrid are effectively improved, the method better conforms to the actual situation, and the introduction of G2P and P2G in the model can effectively improvethe overall economy of the system. The invention aims to solve the problems of information complexity and asymmetry existing in multi-energy microgrid scheduling, realize the autonomy of decision making of each energy subnet operator, and provide a solution for a manager of the multi-energy microgrid to search for an optimal strategy of multi-energy distributed scheduling.

An integrated differential oscillator circuit is provided, which has an amplifier circuit with an input and an output, a frequency-selective feedback network with a first inductor and a second inductor, and a DC power supply. The oscillator circuit is distinguished in that the output is transformer-coupled to the input through the first inductor and the second inductor of the feedback network, wherein the output is connected to a first DC voltage through the first inductor and a first DC path, and the input is connected to a second DC voltage of the DC power supply through the second inductor and a second DC path.