53 results about "Slope factor" patented technology

The invention discloses a non-resistance type reference source, and belongs to the technical field of power supply management. The non-resistance type reference source comprises a starting circuit, a reference voltage generation circuit and a bias current generation circuit, wherein when a power supply is constructed, the starting circuit makes the reference source disengaged from a zero state and then retreats after starting is completed; a PMOS pipe with large threshold voltage negative temperature coefficient and an NMOS pipe with small negative temperature coefficient are selected, the negative temperature voltage in reference voltage is obtained through the threshold voltage difference of the PMOS pipe and the NMOS pipe, the positive temperature voltage is determined according to the thermal voltage, the sub-threshold slope factor and the related width-to-length ratio of the MOS pipe, and then the reference voltage VREF with good temperature characteristics can be obtained; bias currents with positive temperature characteristics are generated through the NMOS pope working in a sub-region, and the positive temperature characteristics of the currents can be enhanced when temperature rises. On the basis of traditional threshold reference, reference circuit branches are reduced, so power consumption of a reference circuit is reduced, and the power supply rejection ratio of the reference voltage is increased.

The invention relates to a test analysis method for lug connecting piece fatigue crack expanding, which is technically characterized by installing a test lug on a testing machine; then loading and producing fatigue crack on the lug; adopting a stress intensity factor comprising a straight lug pulled and loaded lengthwise, the straight lug loaded obliquely smaller than 45 degrees, a symmetrical oblique lug pulled and loaded lengthwise, the symmetrical oblique lug loaded obliquely smaller than 45 degrees, an asymmetrical oblique lug pulled and loaded lengthwise and the asymmetrical oblique lug loaded obliquely smaller than 45 degrees to the corresponding delta K; taking a slope factor of 1g(da / dN)-1g(delta K) line as a constant n in the Paris formula, an intercept of a straight line and axis y as a constant C in the Paris formula, and obtaining the Paris formula when the stress ratio is R; and the lug fatigue crack expanding life NC is estimated according to the obtained Paris formula. The invention has the advantages that the applicability is wide, and the test analytical method plays a directive role in researching the lug hole edge fatigue crack expanding properties under various pulling and loading conditions.

A method and apparatus for enhancing the contrast of an image, where pixels of the image having a brightness less than a mean brightness of the image are transformed in accordance with a first straight-line function, and pixels having a brightness greater than the mean brightness of the image are transformed in accordance with a second straight-line function. Variable slope factors of the two straight-line functions are determined by an analysis of the brightness distribution of the transformed output image. The pixels, thus transformed, produce the contrast-enhanced output image.

A method is provided for compensating for output nonuniformity on a display. The method comprises characterizing the display. The method further includes creating a set of data tables wherein one table provides data for compensation along vertical axes of the display and a second table provided data for compensation along horizontal axes of the display, and wherein components of the tables include a linear offset factor to correct data for nonuniformity and a slope factor which permits gray scale information to be recovered at points near the limits of the gray scale range. The characterizing step may include using a optical detector to obtain optical output information from the display. The slope factor may be calculated to preserve top end gray scale range of the display by adjusting luminous output so that input data level maps to separate output grey levels between a truncated and an untruncated level.

The invention discloses an automatic calibration method of an air compressor system sensor. The method comprises that according to normal working temperature and a pressure range of an air compressor system in a specific work environment, an output valve of a sensor is calculated through a data acquisition module and an analog-digital conversion module, a calibration formula of the air compressor system sensor is obtained according to a calibration formula of operating characteristics of a linear transducer, and the air compressor system is adjusted to enable a calibration value of the sensor to be zero, so a zero calibration value is obtained; the air compressor system is adjusted to enable the calibration value of the sensor to be a certain fixed value of a range detected by the sensor when the air compressor system normally works, so a slope factor calibration value is obtained; and the zero calibration value and the slope factor calibration value are placed in the air compressor system, and calibration is carried out for an output signal of the sensor according to the zero calibration value and the slope factor calibration value. According to the method, calibration for the sensor can be finished quickly in a high quality mode, existing personal errors caused by manual calibration are avoided, work efficiency and calibration accuracy are improved, labor intensity of calibration is lightened, and normal operation of the air compressor system is guaranteed.

The invention discloses a shallow surface soil landslide forecast method and belongs to the technical field of landslide prevention and control engineering. The method comprises the following steps of measuring a slope alpha of a shallow surface soil landslide mass, an area A of the landslide mass, an upper-side slope beta of a landslide, an upper-side area ALu of the landslide, a left-side topographic relief slope theta 1 of the landslide mass, a right-side topographic relief slope theta 2 of the landslide mass, a left-side topographic area AL of the landslide mass and a right-side topographic area AR of the landslide mass; calculating a slope factor S, an upper relief factor U and a two-side topographical factor C; calculating a topographical factor T of the shallow surface soil landslide; calculating a hydrological factor R; calculating a clay index N; measuring a solid coefficient F on site, and calculating a permeation index K; calculating a topographical factor G; and determining a shallow surface soil landslide inducing possibility grade, and performing landslide forecast. According to the method, the effects of three major factors of geology, topography and hydrology causing the landslide are considered at the same time; a measurement and calculation result better conforms to a landslide formation mechanism; the landslide forecast accuracy and efficiency are high; and the disaster prevention applicability is greatly improved.

The invention provides a large X-band broadband frequency phase scanning antenna array. M columns of antenna unit arrays (2) are arranged in a triangular lattice mode, every two columns are staggered by half an antenna unit and arranged in a spaced mode to form the arrays, and m-1 columns of metal grids (31) are evenly arranged in the lattice of the m columns of antenna unit arrays; m columns of antenna unit arrays and m columns of U-shaped air strip frequency scanning slow wave lines (5) correspond one to one to form a frequency scanning antenna array, each column of U-shaped air strip frequency scanning slow wave line is simulated by a T/R assembly, power distribution is determined according to the power amplitude distribution ratio needed by each output port (7), structural forms of an air strip line and a branch coupler (14) are adopted, and the phase gradient needed by the antenna unit frequency scanning is provided; a broadband phase matching network (8) is introduced to a directly communicated end or a coupling end of each slow wave line, a coupler and the broadband phase matching network act together, so that slope factors, which change with frequency, of output phases of the two output ports of the branch coupler can keep consistent.

This invention relates to professional costume size sorting technique field, which uses fuzzy neutral network module to sort the costume size and is characterized by the following: adopting unit BP formula and adding motion item and leading slope factor and evolution plan strategy for improvement and according to different situations for relative strategies and using fuzzy logic and neutral network relation and compensation aiming at costume size data not easy for sorting and leading fuzzy rule to establish fuzzy neutral network for sample training to realize sorting process intelligence.

The invention discloses a temperature compensation circuit for a laser drive, comprising a positive temperature coefficient current generation module, a zero temperature coefficient current generation module and a temperature compensation proportion control module, wherein the output ends of the positive temperature coefficient current generation module and the zero temperature coefficient current generation module are respectively connected with the input end of the temperature compensation proportion control module; the positive temperature coefficient current generation module can be used for generating positive temperature coefficient current increasing with the temperature rise so as to determine a slope factor for temperature compensation; the zero temperature coefficient current generation module can be used for generating zero temperature coefficient current irrelevant with the temperature so as to determine the initial temperature of the temperature compensation; and the temperature compensation proportion control module can be used for sampling the difference between the positive temperature coefficient current and the zero temperature coefficient current and overlapping the difference with the external input current for controlling compensation current to determine the compensation current and further control the proportion of the temperature compensation, The temperature compensation circuit can be used for flexibly adjusting the compensation proportion of a laser and stabilizing the extinction ratio, adapts to the temperature characteristics of different lasers, and has strong generality.

The embodiment of the invention provides a method and a system for analyzing time series increase of air pollution monitoring data. The method comprises the steps of acquiring observation data series of a monitoring site in a first preset time period; if judging and knowing that the duration time corresponding to a plurality of observation data is greater than a first preset threshold value, a linear fitting coefficient is greater than a second preset threshold value and the slope factor of a fitting straight line is greater than 0, taking the plurality of observation data as target observation data series; and acquiring the duration time of the target observation data series, the linear fitting coefficient and the slope factor, and analyzing the target observation data series. The system is used for executing the method. According to the embodiment, through acquisition of the plurality of continuously increasing observation data, in which the duration time is greater than the first preset threshold value, the linear fitting coefficient is greater than the second preset threshold value and the slope factor of the fitting straight line is greater than 0, the observation data are analyzed, the analysis for dynamic change characteristics of air pollution data is realized, and an accurate and detailed analysis result is obtained.

The invention discloses a method for lossy compression in a real-time database through dynamic prediction. According to the steps of the method, system initialization is carried out, two real-time data are read in, the first datum is written into the database and is saved as 'the final read-in datum', and according to the former two data and the error permitted range, the top and bottom limitation of a slope factor is calculated, and each modification value is initialized as zero; new data are read in, and the top and bottom limitation of the slope factor is calculated according to the new data, 'the final read-in datum' and the error permitted range; the top and bottom limitation of the slope factor of the new data and the top and bottom limitation of the current slope factor are compared to determine whether the new data are saved; and the top and bottom limitation of the current slope factor and a slope factor modification value are adjusted, and the second step is repeated. The invention discloses a decompression method for lossy compression in the real-time database through dynamic prediction. The decompression method for lossy compression in the real-time database through dynamic prediction includes the following steps: query time is set as t, the latest three data p1(t1,v1), p2(t1,v2) and p3(t3,v3) before the t are read in, and then pt (t,vt) is calculated in the following calculating method. Compared with the existing calculation, the methods for lossy compression and decompression in real-time database through dynamic prediction have the advantages of being large in compression ratio, small in error, and the like.

The invention discloses a voltage controlled crystal oscillating device used in an atomic frequency standard, and belongs to the field of atomic frequency standards. The crystal oscillating device comprises a voltage controlled crystal oscillator and further comprises a first voltage reference, and a processing module. The first voltage reference is located in the same working environment with the voltage controlled crystal oscillator and is used for providing preset first rectifying voltage for the voltage controlled crystal oscillator. The temperature coefficient of the first voltage reference is multiplied by the voltage controlled slope factor of the controlled crystal oscillator to be added with the temperature coefficient of the voltage controlled oscillator to be equal to zero. The processing module is used for obtaining second rectifying voltage according to a phase demodulation result of a synchronous phase demodulation module and providing the second rectifying voltage for the voltage controlled crystal oscillator. The voltage controlled crystal oscillating device enables output of the VCXO not to be influenced by temperature changes.

The invention discloses a method for measuring soil loss amount through a military map. The method comprises the first step of calculating a rainfall erosion factor R value, the second step of calculating a soil erodibility factor K value, the third step of calculating a slope factor S, the fourth step of calculating a slope length factor L, the fifth step of measuring a vegetation cover and management factor C, the sixth step of measuring a soil and water conservation measure factor P and the seventh step of calculating the soil loss amount. The method solves the technical problems that in the prior art, measuring errors for the soil loss amount are large, and manpower and material resource investment is large.

The invention discloses a method for controlling protection and detection of leakage of spraying nozzles of a gas engine. The method for controlling protection and detection of leakage of the spraying nozzles of the gas engine is cooperatively completed by utilizing an ECU mounted on a car. The method includes the steps that a standard quantitive slope factor is set, a gas pressure decreasing slope factor is calculated and compared with the standard quantitive slope factor, after an engine oxygen sensor closed loop is activated, a fuel spraying adaptive value in an idling area is forced to be cleaned automatically, an inner-outer leakage meter quantity is set, and a deviation and the set inner-outer leakage meter quantity are compared and judged. The method has the advantages that 1, leakage judging of the spraying nozzles is automatically conducted under the situation that using of the engine for a user is not affected ; 2, leveled treatment is conducted according to the severity degree of a failure when the ECU judges that the leakage failure happens on the spraying nozzles, so that a failure action and protection are conducted; 3, after the engine is started again, a failure light is lightened up to remind a driver that a relevant failure of the spraying nozzles exists; 4, the serial number of the failed spraying nozzle and a failure mode (inner leakage / outer leakage) can be accurately judged, and the user and a repairman are guided to repair; and 5, detection can be conducted repeatedly after repair to prevent recurrence of the failure.

The invention discloses a digital dynamic lag type detection device and method of a flyback power converter. The detection method comprises the following steps of: receiving a first input voltage signal of a flyback power converter, referencing a critical voltage so as to determine whether to begin to count; if reaching a counting beginning condition, counting a preset built-in frequency; after the counting is finished, sending out a first output signal so as to switch a switch of the flyback power converter; after the switch is switched, detecting the slope factor of the current first input voltage signal so as to determine the adjusting numerical value of the preset built-in frequency. The preset built-in frequency and the adjusting numerical value are integers, and the delay time can be precisely controlled in a numerical implementing way.

The invention relates to fiber sensing pressure measuring. In order to provide a fiber pressure sensor with little light intensity fluctuation, high sensitivity and stable slope factor, the invention adopts the technical scheme that: the invention discloses a device for measuring active photonic crystal fiber pressure; and the device comprises a semiconductor laser, a fiber-coupling lens group, a polarizer, a fiber resonant cavity of the semiconductor laser and Yb-doped and polarization-maintaining photonic crystal fiber, wherein the semiconductor laser is used for generating lasers; the fiber-coupling lens group and the polarizer are used for converting the lasers in the semiconductor laser into polarized light and coupling the polarized light into Yb-doped photonic crystal polarization-maintaining fiber; a dichroic mirror is tightly close to a pumping end face of the Yb-doped and polarization-maintaining photonic crystal fiber so as to serve as a front cavity mirror, and the cross-section of the vertically-cut Yb-doped and polarization-maintaining photonic crystal fiber forms 4% of a Fresnel reflection structure so as to form a rear cavity mirror; and the output of the rear cavity mirror is loaded to a power meter through a polarization analyzer. The device for measuring the active photonic crystal fiber pressure is mainly applied to pressure detection.

An anti-loose screw comprises a screw body extending along a center axis and an anti-loose thread arranged on the screw body. The anti-loose thread comprises a plurality of standardized screw threadsand at least one deviating screw thread, each standardized screw thread surrounds the center axis by one circle and is provided with a standardized outline face, and the at least one deviating screw thread surrounds the center axis by one circle and is provided with a deviating outline face. The deviating outline faces are each provided with a deviating convex part axially deviating and staggeredrelative to the standardized outline faces, and the axial distance between any point on the deviating convex parts and the corresponding same-position point of the adjacent standardized outline face is equal to a deviating screw pitch. The slope factors of the deviating convex parts of the at least one deviating screw thread have consistency, and the manufacturing process of the anti-loose screw is more convenient.

The invention discloses a nonlinear slope compensation circuit irrelevant to temperature. The nonlinear slope compensation circuit comprises a linear voltage generation circuit, a nonlinear voltage generation circuit, a reference current source and a reference voltage source, wherein in cooperation with the reference current source, the linear voltage generation circuit converts a switching control signal of a power tube into a linear slope signal and outputs the linear slope signal to the nonlinear voltage generation circuit; in cooperation with the reference voltage source, the nonlinear voltage generation circuit converts the linear slope signal into nonlinear slope compensation voltage irrelevant to the temperature. The nonlinear slope compensation circuit has the advantages that the slope factor of a slope can be increased along with the increase of duty ratio, the problem of over-compensation under the condition of low duty ratio caused by the compensation of the slope with the fixed slope factor is reduced, and the compensation accuracy is improved; moreover, the output compensated voltage is irrelevant to the temperature, the temperature stability is high, and the circuit is easy to implement and is stable and reliable to work.

The invention relates to a method for calibrating the practical effective special resolution of an optical surface profilometer. A power spectrum density curve of a fractal surface is a line which has a slope factor -n under logarithmic coordinates. Through use of the regularity, an atomic force microscope is adopted to test a sample, which complies with the fractal surface, in different ranges (10 mum*10mum, 5mum*5mum, 2mum*2mum and 1mum*mum) and a fitting line of obtained PSD (power spectrum density) curves is used as a standard to calibrate the optical surface profilometer so as to realize an objective of determing the practical effective spatial resolution of the surface profilometer. The method for calibrating the effective spatial resolution of the optical surface profilometer is simple in principle and convenient to operate and capable of completing a calibration work while testing the ultra-smooth sample, significantly reducing the difficulty and cost of the calibration of the optical surface profilometer, determining the practical effective spatial resolution of the optical surface profilometer and quantitively giving a surface roughness in a practical spatial resolution range.

The invention belongs to the drilling equipment filed, and particularly relates to a double guide rod coercing reset type float collar. The double guide rod coercing reset type float collar is characterized in that resetting of a valve core is enabled to be accurate andhave zero deviation by matching guide rods on two sides of the valve core with valve core supporting structures on an upper valve seat and a lower valve seat and through a reset spring, reliable sealing of the valve core and a middle valve seat is achieved through a seal valve block on the valve core, good erosion resistance effects of the valve core are obtained through different slope factors of the surface of the seal valve block, and therefore no sediment deposits around the valve core, and simultaneously, reliability of reverse direction sealing can be enhanced by using a sealing self locking structure of the lower valve seat cooperatively with a matched rubber plug. The double guide rod coercing reset type float collar is simple in structure, and can achieve reliable sealing in horizontal well cementing operation.

The invention provides a light guide film which is used for uniformly distributing lights from a point light source. The light guide film comprises a multi-faced edge which is used for receiving light of the point light source and which comprises at least a first group of slopes and a second group of slopes which have plane surfaces. The two groups of slopes respectively further comprise a first slope factor and a second slope factor, wherein the first slope factor does not exceed 85 DEG and the second slope factor is at least 5 DEG, and the first slope factor is at least 5 DEG larger than the second slope factor.