38results about How to "Avoid quadratic errors" patented technology

The invention relates to a processing technology of a silicon slice for manufacturing of an integrated circuit, in particular to a method for doubly setting and accurately positioning the centre of the silicon slice. The method comprises the following steps of: rotating the silicon slice along centre direction; identifying edges of the silicon slice sequentially by linear image identification sensors having different precisions; determining positions of a flat edge or a notch; determining the offset of the centre of the silicon slice; and moving the silicon slice by using a bidirectional movement motor to make the centre of the silicon slice overlapped with a designed position. Therefore, a transmission error of the silicon slice existing in processing equipment in the process of semiconductor industry is avoided, and the precision of the set centre of the silicon slice is equal to 1 mu m by using the double-setting method.

The invention belongs to the technical field of information extraction methods, and particularly relates to a method for predicting nitrogen, phosphorus and potassium contents of black soil by using aviation hyperspectral data. The method includes the following steps of: step 1, data preprocessing, namely, preprocessing the hyperspectral data by using an FLAASH algorithm based on an MODTRAN4+ radiation transfer model, and performing abnormal band removal and normalization processing on the spectral data subjected to radiation correction and geometric correction; step 2, spectral parameter calculation, namely, calculating spectral parameter values of 3 categories including 18 subclasses, taking the calculated spectral parameter values as training data, and carrying out modeling with the assay content; and step 3, establishing a model, adopting a principal component analysis method, extracting factors with the maximum correlation between the soil nutrient content and the spectral parameters, establishing a regression equation by using a least square method, finally evaluating root-mean-square errors of a model prediction result, and analyzing the regression effect.

The invention discloses a device and a method for measuring the characteristic impedance and the complex wave number of an acoustic material. The device comprises an acoustic tube, an impulsive sound source, a microphone, a power amplifier, a signal conditioner, an adapter and a data acquisition device, wherein the acoustic tube consists of a section of large-diameter cylindrical tube, a conical tube and a small-diameter cylindrical tube which are fixedly connected with one another coaxially; three through holes which are vertical to the center axis of the small-diameter cylindrical tube are formed in the side wall of the small-diameter cylindrical tube; the impulsive sound source is arranged in the large-diameter cylindrical tube; and a back cover is in threaded connection with the outer end of the small-diameter cylindrical tube. The method comprises the following steps of: firstly, acquiring a frequency response function of a whole measuring system; secondly, acquiring required excitation signals of the impulse sound source, and exciting the measurement of the impulsive sound source to obtain sound pressures and vibration velocities of front and rear end surfaces of a sample to be tested; and finally, calculating the characteristic impedance and the complex wave number of the sample to be tested. By adopting the method, the problem that the measurement at a low-frequency band is not accurate enough when the characteristic impedance and the complex wave number of a high-flow-resistance material are measured by using the conventional double-cavity method and the conventional double-thickness method is solved.

Provided are a blood glucose detection system and detection method. At present, blood glucose detection is carried out by venous blood glucose detection and capillary blood glucose detection, but thedetection method is inaccurate, and a patient cannot be injected with insulin well according to the blood glucose content. The blood glucose detection system comprises a CPU (1) and an LED circuit (9); the CPU (1) is electrically connected with the LED circuit and a filter circuit (8), the filter circuit is electrically connected with a differential amplifying circuit (7), the differential amplifying circuit is electrically connected with two logarithmic amplifying circuits (6), the logarithmic amplifying circuits are electrically connected with a filter (5), the filter is electrically connected with a Y coupler (4), and the Y coupler is electrically connected with an optical fiber sensor (3). The blood glucose detection system and detection method are used for blood glucose detection.

The invention belongs to the technical field of machining, and relates to a centering non-deformation hole grinding pitch circle clamp. The clamp comprises a clamp body, an inner cam is assembled on the clamp body in a centering mode, a plurality of centering spigots and positioning curved surfaces are arranged on the inner wall of the inner cam at intervals, the positioning curved surfaces are distributed in an Archimedes spiral mode, a centering assembly is rotationally arranged in the inner cam and comprises an annular tooth-shaped retainer and a plurality of positioning rods loosely connected to the tooth-shaped retainer, and the positioning rods are in contact connection with the positioning curved surfaces to position a workpiece. The centering non-deformation hole grinding pitch circle clamp has the advantages of being simple in structure, low in price, accurate in centering and free of deformation in workpiece machining.

The invention relates to a safe and quick method for precisely determining the gas-liquid ratio. The method is implemented by a precise gas-liquid ratio measuring device. The method includes the following specific steps that after a liquid-carrying gas phase enters a flow fine-tuning valve from a pipeline, a gas source with lower pressure and stable and slow flow rate can be obtained; after treatment, the gas source enters the middle of a buffer flask from a gas inlet pipeline and then rapidly expands in the buffer flask, the temperature and the pressure are fully lowered, cooling liquid in the gas inlet pipeline directly drops into a liquid meter, and the remaining fluid is further cooled by a peripheral cooling tank; the separated liquid enters the liquid meter, and the gas phase entersthe gas meter through a gas outlet pipeline. The entire measuring body device including the buffer flask, the liquid meter and a base is designed in an integrated structure. After the measurement is completed, the gas source is turned off, the liquid meter and other main devices are taken out from the liquid nitrogen cooling tank, and the precise gas-liquid ratio can be obtained by directly reading data on the liquid meter and a gas meter when the temperature of the liquid meter and gas meter is restored to room temperature. The process test is safe, and the method is convenient and fast, highin test precision and easy to apply and popularize.

The invention discloses a multi-element geochemical anomaly identification method based on graph attention self-coding. The method comprises the following steps: determining a composition threshold value K; constructing a geochemical element topology network; learning the multi-element geochemical characteristics; reconstructing a multi-element geochemical element background; and calculating multiple abnormal values. According to the method, graph learning is introduced into geochemical exploration anomaly detection, a geochemical element topological relation graph is constructed by using K-nearest neighbor, and a graph attention auto-encoder capable of simultaneously extracting element composition relations and spatial structure features is constructed and trained. The multi-element geochemical background is reconstructed based on the trained graph attention auto-encoder, and an abnormal value of each final sampling point is obtained by calculating . According to the method, an existing neural network model is expanded, so that the model can directly process sampling point data and can be applied to irregular areas, the learning performance of a geochemical exploration background and the practicability of the model are greatly improved, and a practical and reliable geochemical exploration anomaly identification method is provided for complex geological conditions.

The invention provides a device and method for measuring the plate width of cover plate glass, and belongs to the technical field of cover plate glass production. The device includes measuring supports, measuring sliding blocks and measuring scales; the measuring supports are arranged at two sides of the cover plate glass, the measuring sliding blocks are connected with the measuring supports, andthe measuring sliding blocks can move on the measuring supports along a vertical direction; and the measuring scales are mounted on the measuring sliding blocks, can slide on the measuring sliding blocks along a direction vertical to a cover plate glass conveying path, and are used for measuring the plate width of the cover plate glass. While working, the measuring scales do not contact with thecover plate glass, the problem in the prior art that due to a human error or equipment, scratches more or less occur, causing product waste and reduction of capacity, is solved, the production efficiency is improved, the structure is simple and the operation is convenient.

Disclosed are an answer obtaining method and device for speech data, a storage medium and computer equipment. The answer obtaining method for the speech data comprises the steps of converting the obtained speech data into a speech identifier text, wherein the speech identifier text comprises at least one word speech identifier; utilizing the word speech identifiers in the speech identifier text for word matching to obtain a character text, wherein the character text comprises semantic identifier words matched with the word speech identifiers; conducting semantic understanding processing on thecharacter text to obtain the semantics of the speech data. By means of the technical scheme, the accuracy of speech and semantic identification can be improved, accurate knowledge points of speech input are obtained accordingly, and the accuracy of obtaining answers from the speech data is improved.

An embodiment of the invention provides an error calibration method and device, and relates to the field of inertial navigation modules. The error calibration method comprises the steps of: collectingfirst acceleration when a vehicle is located at a first preset position in preset time; rotating a vehicle body of the vehicle by a preset angle to enable the vehicle to be located at a second presetposition, and acquiring second acceleration when the vehicle is located at the second preset position within preset time; calculating a roll error angle and a pitch error angle between a standard coordinate system and an actual coordinate system according to the first acceleration and the second acceleration; calculating a course error angle between the standard coordinate system and the actual coordinate system according to the roll error angle and the pitch error angle; and calibrating the installation error of an inertial navigation module according to the roll error angle, the pitch errorangle and the course error angle. According to the error calibration method and the device, the limitation of a vehicle body rotating method on the weight of the vehicle body is avoided, secondary errors caused by an indirect calibration method are avoided, the installation precision of the inertial navigation module is improved, and the positioning of the inertial navigation module is more accurate.

The invention discloses a multi-face prism which comprises a prism body made of glass, the prism body comprises three or more reflecting faces, a first end face formed by intersecting with the three or more reflecting faces, and a second end face opposite to the first end face. The included angle between the reflecting surface and the first end surface is 90 degrees or less than 90 degrees. The multi-face prism provided by the invention can be finished through one-time processing by a mould pressing integral forming process, and does not need to be processed for more than two times.