35 results about "Characteristic ratio" patented technology

The present application relates to a method, an apparatus and a storage medium for locating QR codes. For automatically locating a plurality of QR codes in image of any size, the invention provides an apparatus for locating at least one QR code in an image, comprising: characteristic ratio detection means for detecting the potential QR code location symbol areas by carrying out a plurality of detections for detecting the characteristic ratio of the QR code; critical edge detection means for detecting the critical edges of the potential QR code location symbol areas so that the false areas are excluded; location symbol grouping means for matching the detected QR code location symbol areas into potential QR codes; and verification means for excluding the false QR codes. The invention also provides a corresponding method for locating at least one QR code.

A polarizing film comprising a stretched film containing iodine, wherein an absorbance characteristics ratio of ((an absorption peak A in a wavelength range of 550 to 650 nm) / (an absorption peak B in a wavelength range of 450 to 520 nm)) is no more than 1.5 when the polarizing film is arranged in a crossed Nicol, form a liquid crystal display for color display that provides as neutral hue as possible, and gives good black color display, and as a result gives an outstanding reproducibility of color.

An apparatus and method is presented for controlling the quality of a mass density measurement of a multiphase fluid mixture including a plurality of fluid fractions and a plurality of constituting elements. The method includes the steps of: submitting a measuring pipe to a flux of high energy photons and measuring count rates; determining a mass density of the multiphase fluid mixture based on count rate measurements in a first and second energy windows; determining an electronic density of the multiphase fluid mixture based on count rate measurements in a third energy window; and comparing the electronic density to the mass density of the multiphase fluid mixture.

A transducer array for high-intensity focused ultrasound tumor treatment belongs to the field of medical equipment. The present invention is composed of a matching layer and a piezoelectric ceramic sheet. The matching layer is a concave spherical thin-shell bowl-shaped acoustic radiation layer with uniform thickness. All piezoelectric ceramic sheets are glued on the outer surface of the same matching layer. Multiple identical Piezoelectric ceramic sheets constitute a large-aperture co-concave spherical compact mosaic transducer array. The invention has a high array focused sound intensity ratio and symmetrical focused sound field characteristics; the piezoelectric ceramic sheet area of ​​each array element is small, and the manufacturing cost is low; the number of array elements and the number of power amplifier channels are small, and the power amplifier, phase shifting The consistency of the transducer and the matching network is easier to realize, manufacture, and adjust, and the stability and reliability are greatly improved; the common matching layer provides a firm support for the transducer array element, and resonant reinforcement occurs together with the array element The consistency of the resonance of each array element is ensured, and the output sound power of the array is maximized.

The invention discloses a radio-frequency source frequency calibration method for jump frequency from direct tracing to a high excited state. According to the method, energy level splitting is produced by using the quantum interference effect of high excited atoms under the action of a radio-frequency field and an electric field, and the frequency of the measured radio-frequency field can be effectively traced to the energy level interval of atoms by measuring the characteristic ratio of two split transmitted spectrum peaks. The frequency measuring basis can be directly compared with the jump frequency of atoms, so that the accuracy of frequency measurement is effectively improved. The method can directly trace the frequency of the radio-frequency field to the jump frequency of atoms, a new method is provided for the frequency measurement of the high radio-frequency field, and the method has good measurement accuracy and self-calibration property.

The invention discloses a double-symmetrical-tube-shell type sulfuric acid cooler, and relates to a heat exchanging device for recovering heat in the high-temperature concentrated sulfuric acid cooling process. The double-symmetrical-tube-shell type sulfuric acid cooler comprises two completely-symmetrical and completely-same tube-shell type heat exchanging sections and structurally comprises an acid inlet tube box, the heat exchanging section A, an acid connecting tube box, the heat exchanging section B, an acid outlet tube box and a connecting water tube or steam pocket. If the shell sides of the two heat exchanging sections are connected with the steam pocket, a steam generator is formed, and if the shell sides of the two heat exchanging sections are connected through a tube, a water heater is formed. The temperature values of an acid inlet and an acid outlet and the temperature value of acid in the connecting tube box are measured online, meanwhile, the temperature value of saturated steam or the temperature values of a water inlet and a water outlet and the temperature value of water in the connecting water tube are measured, and the characteristic ratio of the sulfuric acid cooler is calculated through the temperature values. Once leakage occurs, the practical value of the characteristic ratio can be remarkably changed, and therefore the leakage can be monitored.

The invention discloses a recovering method of a synchronous nitrosation-anaerobic ammonia oxidation and denitrification process, and belongs to the field of advanced wastewater treatment. In the SNAD (Synchronous Nitrosation-Anaerobic ammonia oxidation and Denitrification) process, NOB (Nitrite Oxidizing Bacteria) can be greatly proliferated due to inappropriate operation, and the denitrification effect of the system is continuously decreased and even broken down. According to the recovering method disclosed by the invention, (1) an aeration rate is adjusted to always maintain the dissolved oxygen concentration in the reaction stage to be under 0.3 mg / L; (2) the hydraulic retention time (HRT) is shortened, and the effluent of the reactor always contains NH4<+>-N (greater than or equal to 10 mg / L); (3) an NaOH solution is added to the inflow, and the pH value of the inflow is increased to 7.8-8.0; (4) an inorganic carbon source is artificially added to the inflow, and the ratio of the basicity to the ammonia-nitrogen concentration is maintained to be 10 (gCaCO3 / Gnh4<+>-N) above. The strategies are maintained to be continuously operated until the characteristic ratio (namely the ratio of a total nitrogen removal amount to the generated nitrate-nitrogen amount) is greater than 20, the total nitrogen removal rate is greater than 75%, and the strategies are continuously operated for more than 10 cycles, and then the synchronous nitrosation-anaerobic ammonia oxidation and denitrification process is considered to be effectively recovered.

The invention relates to a radial artery pulse wave based cardiovascular function parameter detection and analysis method and device. The detection and analysis method is characterized by extracting characteristic information and computing cardiovascular function parameters by analyzing the pulse wave series acquired in real time. In the method, an amplitude characteristic ratios method and a yielding point method are combined to detect and analyze the artery parameters, and when the heart function parameters are detected and analyzed, different ranges are set for the pulse waves corresponding to different templates to search for characteristic points, thus ensuring the method to be rapid and accurate. In the detection method provided by the invention, a pulse clip is used for fixing a pulse sensor and the degree of tightness of the pulse clip is adjusted by a control chip according to the strength of the pulse signals, thus enabling data acquisition to be more rapid and accurate. Thedetection device is provided with an air adjusting device which ensures that the blood pressure related data can be acquired in the aeration stage, thus accelerating the speed of data acquisition. Inaddition, a special power source is used for supplying power to the device, thus ensuring the personal safety of the users.