36 results about "Form constant" patented technology

A microphone array, beam forming method and apparatus using the microphone array, and a method and apparatus for estimating an acoustic source direction using the microphone array are provided. The apparatus for forming constant directivity beams comprising: a microphone array, which is comprised of first through n-th microphone sub-arrays, wherein each of the microphone sub-arrays comprises: a first microphone placed at a predetermined location on a flat plate, which commonly belongs to each of the microphone sub-arrays; and second and third microphones placed at locations perpendicularly spaced by a predetermined segment from a straight line connecting the first microphone and the center of the flat plate, the predetermined segment being determined depending on a target frequency allotted to reach of the microphone sub-arrays, a beam formation unit receiving voice signals output from the first through n-th microphone sub-arrays and generating a beam for each of the first through n-th microphone sub-arrays; a filtering unit filtering the beams output from the beam formation unit; and an adding unit adding the filtered signals output from the filtering unit.

The invention discloses a method of self-customizing report forms for users, comprising the following steps: A, establishing a new report form and selecting the type of the report form; B1, if the selected report form type is a report form in which an user can fill and submit, drawing a report form template firstly and saving the report form template to a database after finishing drawing; then defining a report form index and binding the report form index and the table cell of the report form; and then defining a summary statistical formula and a calculation formula, carrying out summary statistical calculation according to the summary statistical formula and the calculation formula, showing the report form analysis; B2, if the selected report form type is a report form in which an user can not fill and submit, firstly defining a report form data source, drawing the report form template and saving the report form template to the database; and then defining a report form figure selection formula, a calculation formula, and a report form constant; finally, showing the report form analysis. The invention transforms the complex report form figure selection and formulas into a perceivable and understandable operation mode for users, so that the report forms can be self-customized by users.

The invention provides a comparator for a oscillator circuit with a self bias reference voltage. The comparator includes: a depleted metal oxide semiconductor transistor network which forms constant current equivalent connection, wherein a gate electrode and a source electrode which belong to the depleted metal oxide semiconductor transistor are connected; a enhanced metal oxide semiconductor transistor network, wherein a drain electrode or a source electrode of the enhanced metal oxide semiconductor transistor is connected with the depleted metal oxide semiconductor transistor in series, and a gate electrode terminal can receive a input voltage. The comparator outputs a high level signal when the input voltage is lower than the reference voltage and a low level signal when the input voltage is higher than the reference voltage. Moreover, the oscillator circuit with the comparator ensures that the reference voltage is independent from changes of external voltage source and temperature.

The invention discloses a constant direct-axis current control method and system of an embedded permanent magnet synchronous motor, and belongs to the technical field of motors. According to the constant direct-axis current control method and system disclosed by the invention, a coordinate original point O and an intersection point A of a limited current circle and a quadrature-axis current form constant direct-axis current control of a constant torque output region, an intersection point of a straight line perpendicular to a direct-axis current and extending from a center C of a voltage limited oval of a control region of the embedded permanent magnet synchronous motor and a center point B of the voltage limited oval form constant direct-axis current control of a constant power output region, a phase current, a phase voltage and a rotational speed of the embedded permanent magnet synchronous motor are detected according to a target rotational speed of the embedded permanent magnet synchronous motor, and the embedded permanent magnet synchronous motor is driven to work by utilization of the constant and invariable direct-axis current and an inverse relation between the quadrature-axis current and the rotational speed of the motor. The constant direct-axis current control method and system have the characteristics of fast response speed, high reliability and no speed limit control, and have good application prospects in the fields of new energy automobiles and the like.

The invention relates to a strong abrasion resisting electric arc spraying powder core wire containing Ti (C, N) hard phase and a preparation method thereof. The wire comprises the following powder core raw materials by mass percentage: 13-17% of Ti (C, N) powder, 16-20% of Cr powder, 17-23% of Cr2C3 powder, 9-13% of Ni powder, 1-3% of Mo powder, 15-17% of Si-Fe powder, and the rest being Mn-Fe powder. The preparation method comprises the following steps: (1) the powder core raw materials are weighed in proportion; (2) the powder core raw materials are mixed; (3) steel strips are used to wrap the mixed powder core raw materials to form thick wires; (5) the diameter of the thick wires is reduced grade by grade to form finished wire products. The wires can form constant dense protective coating on metal substrates by electric arc spraying, especially supersonic electric arc spraying, the protective coating has Ti(C, N)-based metal ceramic texture and performance, and has the characteristics of stainless steels, has higher hardness, red hardness, abrasion resistance, crater wear resistance and high pyrochemical stability, and is mainly used in surface protection for equipment such as boiler three pipes under high temperature and high abrasion and corrosion.

The present invention discloses a system for photon sampling based on an OEO. The system for photon sampling based on the OEO comprises an optical narrow pulse source based on the OEO and a time domain Fourier transform system. The optical narrow pulse source based on the OEO is generated by a wavelength double-ring OEO structure, a directly modulated laser and a phase modulator are integrated into the wavelength double-ring OEO structure, microwave signals are generated by the OEO structure, the directly modulated laser is modulated to generate optical narrow pulses, the phase modulator is employed to broaden the pulse width to obtain wide-spectrum narrow pulses, and a long fiber dispersive medium is employed to perform dispersion walk-off of the narrow pulses to form constant-amplitude chirped narrow pulses and perform signal sampling. The system and the method employ a characteristic that the OEO structure directly generates signals with high repetition frequency and low phase noise, and combine the time domain Fourier transform system to simplify a production process and an optical serial-parallel converting process of the pulse source with a high repeat rate in photon samplingand have a characteristic of ultralow jittering. The system and the method for photon sampling based on the OEO can be widely applied to the fields of optical communication, optical analog-digital conversion, laser radar, microwave photonics, etc.

A plurality of input signals are pre-distorted for combination into a first combined signal having a constant envelop. The input signals are combined into a second combined signal, and a similarity between each of the input signals and the second combined signal is measured. Ones of the input signals are selected and attenuated based on the similarity measurement. The attenuated input signals and non-attenuated signals are output for combination to form the first combined signal.

The invention discloses a constant current charging-discharging pulse charger, and belongs to the technical field of electronics. The constant current charging-discharging pulse charger is composed ofa process indicting unit, a voice prompt unit, an N-type charging unit, an N-type discharging unit, an interface unit, a pulse unit, a double-selection termination unit, a load unit, and a trickle resistor. The N-type charging unit, the N-type discharging unit and the pulse unit, and the interface unit form a pulse charging form that is capable of charging and discharging and having a charging time longer than the discharging time. A constant current triode of the N-type charging unit is connected in the form of constant current, therefore forming constant current charging. The constant current charging-discharging pulse charger has termination after the full charging of the battery and termination after the end of the timing countdown which can easily switch. After the end of charging ordischarging, the trickle resistor provides required trickle current to a to-be-charged battery, the inverter in each unit is formed of a gate circuit that has mutation input and output. The constantcurrent charging-discharging pulse charger has strong loading capability. After the implementation, the constant current charging-discharging pulse charger can flexibly adjust the charging and discharging time of the to-be-charged power supply and is suitable to to-be-charged batteries of different types.

In the space solar battery string non-contact pressure exerting method used is pressure exerting device with corresponding shape and size to space solar battery string. There is a gas storage cell inside the pressure exerting device, and gas entrnace is at top end of the gas storage cell, some small gas exit are arranged at the bottom end of the gas storage cell. The pressure exerting device is fixed on robot which drives pressure exerting device moving straight above the solar battery, controlls relative space between pressure exerting device and space solar battery, makes gas into gap of space solar battery and pressure exerting device through the small hole on pressure exerting device after gas source is put-through to form constant pressure space to make solar battery be firm fixed on said board.

The invention discloses an inner flame tube applicable to a radiant tube and the radiant tube. The inner flame tube is provided with a shrinkage pipe section, a straight pipe section and an expansionpipe section in sequence in the extension direction from the inlet end to the outlet end. After smoke generated by combustion in a nozzle passes through the inner flame tube, high-speed airflow can inject surrounding low-speed airflow through the shrinkage pipe section, the airflows mix and transfer energy, and accordingly an injection area is formed; afterwards, the injecting airflow passes through the straight pipe section to be mixed with the injected airflow so as to form constant-speed and constant-pressure airflow; and finally, the airflow passes through the expansion pipe section, so that the flow speed is reduced and the static pressure is increased. After the inner flame tube is applied to a self preheating nozzle in cooperation with the closed radiant tube with a single-end inlet, backflow of smoke inside can be achieved to the maximum extent, the smoke is mixed with gas and combustion air to form a mixture for a mild and more uniform combustion way, and the temperature uniformity of the surface of the whole radiant tube is improved.

A high-stability gasification method for LG is related to a gasification part, a heat exchanger, a constant-temperature water tank and a circulating pump which are connected in sequence through a heat exchange medium pipeline, wherein a heat exchange medium passes through the heat exchanger, the constant-temperature water tank, the circulating pump and the gasification part in sequence to form constant-flow closed circulation, heat exchange is conducted between the heat exchange medium flowing out of the gasification part and a heating medium introduced from the outside in the heat exchanger, the heated heat exchange medium is fed into the constant-temperature water tank after absorbing heat and obtains a constant temperature in the constant-temperature water tank so that accurate temperature control can be conducted on the heat exchange medium entering the gasification part, the heat exchange medium in the constant-temperature water tank is directly input into the gasification part through the circulating pump in a constant-temperature and constant-flow mode, and LG is heated by the heat exchange medium in the gasification part so as to be gasified stably. By the adoption of the method, constant temperature and constant flow of the heat exchange medium entering the gasification part are guaranteed, so that gasification stability of LG is improved, LG leakage risks are reduced, and system safety is improved.

The invention relates to a house external wall air-suction type solar indoor cooling device which achieves a novel solar energy utilization mode for an external wall of a house to achieve indoor cooling. The house external wall air-suction type solar indoor cooling device is characterized in that air in a heat insulation layer 1 arranged on the external wall 15 of the house is adopted to be communicated with indoor air, no energy resources are consumed, a solar cell panel 8 serves as a power supply for rotation of an air suction fan 6, the air in the heat insulation layer is constantly absorbed and exhausted through rotation of the air suction fan 6 to form constant exchange and flow of the air in the whole heat insulation layer from bottom to top, solar heat radiation has no chance to heat air in the heat insulation layer 1, and thus a heat conduction medium is lost, so that the effect of blocking the heat conduction effect of solar heat radiation on a wall body of the external wall 15 is achieved, indoor cooling is achieved, the defect that an air conditioner is adopted for cooling in the prior art, and the human body health is influenced is overcome, and the blank that the heat insulation layer is arranged on the external wall of the house and solar energy is used for achieving indoor cooling home and abroad is filled up.

The invention discloses a simplified double selection pulse float charger, and belongs to the technical field of electronics. The simplified double selection pulse float charger is composed of a process indicting unit, a voice prompt unit, an N-type charging unit, an N-type discharging unit, an interface unit, a pulse unit, a double-selection termination unit, a load unit, and a trickle resistor.The N-type charging unit and the interface unit, and the pulse unit cooperate so as to form a pulse-type scientific charging method. A constant current triode of the N-type charging unit is connectedin the form of constant current, therefore forming constant current charging. The double selection termination unit has termination after the full charging of the battery and termination after the endof the timing countdown which can easily switch. After the end of charging or discharging, the trickle resistor provides required trickle current to a to-be-charged battery. In the line, the constantcurrent triode serves to control the on and off in charging and provides double functions of a constant current source, thus simplifying the line. The constant current charging apparatus can performcharging in a more scientific manner and provide maximum charging, so that the constant current charging apparatus can increase the service life and capacity of a charger and the to-be-charged batteryat the maximum and protect environment.

The invention provides a coil sensor resonance parameter measurement method and device. Frequency-adjustable signals generated by a DDS are controlled by a core part composed of a single-chip microcomputer and a CPLD, the amplitude of the signals is amplified to form constant-voltage signals, then the constant-voltage signals are input into a serial circuit composed of a to-be-detected coil and a resistor array, voltage signals at the two ends of series resistors are connected into an ADC through a signal conditioning circuit for data acquisition, the CPLD conducts multiple times of absolute value addition on voltage data at the same signal frequency, an average value is obtained, accordingly a stable voltage value corresponding to the signal frequency is obtained, finally the minimum voltage value is obtained by comparing stable voltage values at different signal frequencies, and signal frequency corresponding to the minimum voltage value is resonance frequency of the to-be-detected coil. The method and device are high in intelligence degree, simple in equipment structure and low in cost, and measuring precision is improved by improving frequency change precision and reducing interference.