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37results about How to "The method is simple and reliable" patented technology

Copper and stainless steel dissimilar metal water adapter vacuum brazing technology method

The invention discloses a vacuum brazing technology method between copper and stainless steel dissimilar metal water connector, comprising processing each part of the water connectior, controling the processing precision and component assembly clearance; washing the part of water connectior; assembling water connections and putting in special fixture. Put the fixture in vacuum brazing furnace and carry out braze welding according to the following brazing technology: 1) take 35 minutes to make the furnace temperature to rise to 650 DEG C at a uniform speed; 2) continue to preserve heat for 20 minutes; 3) rise the furnace temperature at a uniform speed to 890 DEG C in 20minutes; 4) continue to preserve the heat for 20 minutes; 5) then rise the furnace temperature to 970 DEG C+-10 DEG C at a uniform speed in 15 minutes; 6) Continue to preserve heat for 5 minutes; 7) then stop heating and cool naturally; 8) on the next day take out the water connector from the fixture; 9) carry out the acceptance test by using the ultrasonic automatic testing device. The technical problem that the annular gap of the water connector is not fully filled and can be corroded is solved; the invention has the advantages of reliable method and high production efficiency, and can effectively improve the qualified rate of the products.
Owner:NUCLEAR POWER INSTITUTE OF CHINA

Real-time temperature measuring and ablation integrated semi-rigid water cooling microwave ablation antenna

A real-time temperature measuring and ablation integrated semi-rigid water cooling microwave ablation antenna comprises a radiation head, a medium tube, a semi-rigid coaxial cable, a 'water heat exchange cavity' composed of an outer guide sleeve and a water cavity sleeve and a water channel cooling system which is composed of inlet and outlet capillary water tubes and arranged in an antenna body. The antenna is characterized by further comprising a temperature measuring unit provided with a T-shaped thermocouple. A temperature measuring end of the temperature measuring unit protrudes from the top end of the radiation end and can be in zero clearance contact with microwave acted tissue. The method is reliable, the structure is stable, the linearity is good, and the sensitivity is high. By the aid of the reliable and effective temperature measuring mode, the key technology that the temperature is measured in real time while the semi-rigid water cooling microwave ablation antenna performs microwave hyperthermia or microwave ablation in cavities, intestines or blood vessels and even hearts is achieved, and accordingly, powerful guarantee is provided for obtaining of the optimum curative effect and the application expansion, and favorable conditions are provided for the intelligence of semi-rigid microwave hyperthermia or microwave ablation.
Owner:百德(苏州)医疗有限公司

Northern area power grid icing numerical forecast correction method considering solar radiation

The invention discloses a northern area power grid icing numerical forecast correction method considering solar radiation. The method comprises the following steps that ground and high-altitude real-time meteorological data and forecast meteorological data of the day are acquired from the day's weather forecast of a local meteorological station of northern areas, wherein the real-time meteorological data and the forecast meteorological data include temperature data; local power transmission line real-time icing data and numerical mode forecast icing data of the northern areas are collected; inversion of daily solar radiation intensity in the period of real-time icing and forecast icing is performed by using the temperature data; a coordinate system is established with the daily solar radiation intensity acting as the abscissa and the highest temperature acting as the ordinate, and the position of a calculating day in the coordinate system is determined; and the numerical mode icing forecast result is corrected. According to the method, the existing power grid icing model can be corrected so as to further meet the icing process of the northern areas and enhance the accuracy of power grid icing prediction; and the method has the advantages of being simple and reliable, high in operability and high in forecast accuracy.
Owner:STATE GRID HUNAN ELECTRIC POWER +2

Capacitive screen short circuit testing method, capacitive screen and mobile terminal

The invention provides a capacitive screen short circuit testing method, a capacitive screen and a mobile terminal. The method comprises the following steps: selecting a first to-be-detected touch electrode and a second to-be-detected touch electrode; setting a first input/output interface connected with the first to-be-detected touch control electrode in a touch control IC to be the output mode;setting a second input/output interface connected with the second to-be-detected touch control electrode in the touch control IC to be the input mode; setting the rest input/output interfaces in the touch control IC to be the high-resistance-state mode or the low-level output mode; outputting a level signal through the first input/output interface, and detecting whether a feedback signal is received by the second input/output interface or not; if the feedback signal is received, comparing the feedback signal with the level signal; if the feedback signal is consistent with the level signal, determining that a short circuit occurs between the first to-be-detected touch electrode and the second to-be-detected touch electrode. The method is simple and reliable. Through simple signal processing, the detection of the short circuit condition of the touch control electrode in the capacitive screen can be realized.
Owner:SHENZHEN DEMINGLI ELECTRONICS

Two-level VSC current converter inter-pole short-circuit switch characteristic fault positioning method

The invention discloses a two-level VSC current converter inter-pole short-circuit switch characteristic fault positioning method, and belongs to the technical field of the flexible DC grid control and protection. The method comprises the following steps: analyzing an AC feed physical process of a two-level VSC current converter under a DC side inter-pole short-circuit working condition in detail,and dividing the physical process into three stages according to a switch-on condition of an internal bridge arm in the current converter; estimating the approximate time interval, of firstly accomplishing the commutation from the occurrence of the fault, of the current converter by deriving the change rate limitation of the AC feed current at each stage; and on this basis, dividing a DC line into different fault sections according to the association of the internal bridge arm switch condition and the fault position electric distance. The own feed commutation physical process is clearly clarified after the current converter inter-pole fault occurs, the different fault sections can be approximately corresponded by only utilizing the current converter switch information, thereby providing anew path for the future development of the protection and fault positioning principle of the flexible DC grid.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)

Equal thickness interference method based centering error measuring device

The invention discloses an equal thickness interference method based centering error measuring device which comprises a laser device, a convergent mirror, a star tester, a spectroscope, a reference mirror, a receiving screen, a CCD (charge coupled device) detector, a computing group, a focusing group, a turning reflector, a measured lens, a connecting fixture and a precision rotating shaft. The convergent mirror, the star tester and the spectroscope are sequentially disposed on an optical axis of the laser device, the star tester is positioned on a focus of the convergent mirror, the reference mirror, the receiving screen and the CCD detector are sequentially disposed in an optical axis direction of a reference beam, the focusing group and the turning reflector are sequentially disposed on an optical axis of a measurement beam, the measured lens, the connecting fixture and the precision rotating shaft are sequentially disposed on an optical axis of the measurement beam turned by the turning reflector, and the measured lens is fixed on the precision rotating shaft through the connecting fixture. By the aid of the equal thickness interference principle, centering errors of the measured lens can be measured, and the equal thickness interference method based centering error measuring device can achieve whole-group measurement of a multi-lens group and is higher in precision than that of conventional visual microscopic measurement.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI

Aircraft quality characteristic simple measuring device and measuring method

The invention relates to the technical field of aircraft quality characteristic measurement, and discloses an aircraft quality characteristic simple measuring device and an aircraft quality characteristic simple measuring method. The aircraft quality characteristic simple measuring device comprises a horizontally-arranged measuring platform, wherein two supporting mechanisms are installed on the measuring platform; and each supporting mechanism comprises a base and two hydraulic telescopic rods vertically fixed to the base, a cross beam is horizontally installed at the top parts of the two hydraulic telescopic rods, the outer wall of the cross beam is sleeved with a plurality of sleeves, universal joints are fixed to the bottom parts of the outer walls of the sleeves, and lifting ropes arearranged on the universal joints. According to the aircraft quality characteristic simple measuring device and the aircraft quality characteristic simple measuring method, an aircraft is hung above the measuring platforms, and the position of the centroid relative to the hanging point can be calculated by using a balance equation of the moment of the hanging point, so that the position of the centroid of the aircraft is determined; and the moment of inertia of the aircraft is measured by adopting a double cycloid method, the operation is simple, and the method is reliable and can be widely applied to aircraft quality characteristic measurement.
Owner:CHINA AERODYNAMICS RES & DEV CENT

Method for determining stability of profile control and flooding microsphere aqueous solution

The invention discloses a method for determining the stability of a profile control and flooding microsphere aqueous solution, which comprises the following steps: adding profile control and flooding microspheres into a target water sample, uniformly stirring to prepare a target solution with the concentration of the profile control and flooding microspheres in the target solution being 0.1-1%, determining the turbidity of the target solution, and recording the turbidity as N0; adding the target solution into a centrifugal tube for centrifugation wherein, the centrifugation rotating speed is 2000-8000 rpm, the centrifugation time is 1-5 min, and the centrifugation temperature is 60-70 DEG C; after centrifugation is finished, absorbing middle-layer liquid, measuring turbidity, and recording as N1; and calculating the stability index, wherein S = N1/N0, and the larger the value of S is, the higher the stability is. According to the method, the stability of different profile control and flooding microspheres in a water sample with the mineralization degree of 20000 mg/L can be accurately obtained; standards are provided for stability determination of different profile control and flooding microspheres, and the problems that stability evaluation results of existing profile control and flooding microspheres observed by naked eyes are large in difference, and the method is low in reliability are solved.
Owner:济南雅歌新材料科技有限公司

Inertial measurement unit calibration method based on Stewart platform

PendingCN114459502AThe method is simple and reliableCalibration process is simple
The invention discloses an inertial measurement unit calibration method based on a Stewart platform. The inertial measurement unit composed of a three-axial acceleration sensor and a three-axial angle sensor is fastened to the center position of a moving plane of the Stewart platform; the Stewart platform is controlled to generate linear vibration with different frequencies and amplitudes in the X direction, the Y direction and the Z direction, and excitation acceleration is provided for the triaxial acceleration sensor; the Stewart platform is controlled to generate angular vibrations with different frequencies and amplitudes around the X direction, the Y direction and the Z direction respectively, and excitation angles are provided for the triaxial angle sensor. Acquiring an output signal of the inertial measurement unit by using data acquisition equipment, and processing the signal; inertial measurement unit calibration based on the Stewart platform is realized by combining an excitation signal measured by a machine vision method and an output signal processing result acquired by data acquisition equipment. Compared with the existing method, the method can complete calibration without repeatedly installing the inertial measurement unit, and has the advantages of flexibility, simplicity, high efficiency and the like.
Owner:NAT INST OF METROLOGY CHINA +1
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