Abstract: The present disclosure provides a camera calibration method, system, storage medium for X-ray imaging. The method may include acquiring at least one image taken by a camera to be calibrated, wherein the at least one image may include a calibration target, and the calibration target may include at least one calibration point; selecting any calibration point of the at least one calibration point as a target calibration point; determining, based on the at least one image, image coordinates of the target calibration point; obtaining a first position and a second position of an X-ray imaging device; determining, based on the first position and the second position, spatial coordinates of the target calibration point; and performing calibration on the camera to be calibrated based on the image coordinates and the spatial coordinates.

Abstract: Disclosed are a laser transmission circuit, a laser transmission component and an electronic measuring instrument. The laser transmission circuit includes: an analog receiving unit, and a digital feedback path. The analog emission unit is configured to convert the accessed input analog signal into an analog laser signal, and emit the analog laser signal. The analog receiving unit is configured to convert the analog laser signal into an analog electrical signal as an output signal of the laser transmission circuit. An input end of the digital feedback path is connected to an output end of the analog receiving unit. An output end of the digital feedback path is connected to a feedback input end of the analog emission unit. The digital feedback path is configured to access the analog electrical signal output by the analog receiving unit, convert the analog electrical signal into a digital signal, and transmit the digital signal.

Abstract: The present invention relates to a foam containing water, between 5 and 30 wt % on total weight of the foam of a chelating agent selected from the group of glutamic aid N,N-diacetic acid or a salt thereof (GLDA), aspartic acid N,N-diacetic acid or a salt thereof (ASDA), methylglycine N,N-diacetic acid or a salt thereof (MGDA), N-hydroxyethyl ethylenediamine-N,N?,N?-triacetic acid or a salt thereof (HEDTA), a foaming agent, and at least 25 vol % on total volume of the foam of a gas, and having a pH of between 2 and 5, to a viscosified composition containing water, between 5 and 30 wt % on total volume of the composition of a chelating agent selected from the group of glutamic aid N,N-diacetic acid or a salt thereof (GLDA), aspartic acid N,N-diacetic acid or a salt thereof (ASDA), methylglycine N,N-diacetic acid or a salt thereof (MGDA), N-hydroxyethyl ethylenediamine-N,N?,N?-triacetic acid or a salt thereof (HEDTA), and at least 0.

Abstract: The present invention relates to a foam containing water, between 5 and 30 wt % on total weight of the foam of a chelating agent selected from the group of glutamic aid N,N-diacetic acid or a salt thereof (GLDA), aspartic acid N,N-diacetic acid or a salt thereof (ASDA), methylglycine N,N-diacetic acid or a salt thereof (MGDA), N-hydroxyethyl ethylenediamine-N,N?,N?-triacetic acid or a salt thereof (HEDTA), a foaming agent, and at least 25 vol % on total volume of the foam of a gas, and having a pH of between 2 and 5, to a viscosified composition containing water, between 5 and 30 wt % on total volume of the composition of a chelating agent selected from the group of glutamic aid N,N-diacetic acid or a salt thereof (GLDA), aspartic acid N,N-diacetic acid or a salt thereof (ASDA), methylglycine N,N-diacetic acid or a salt thereof (MGDA), N-hydroxyethyl ethylenediamine-N,N?,N?-triacetic acid or a salt thereof (HEDTA), and at least 0.

Abstract: The present invention covers a fluid and kit of parts suitable for treating carbonate formations containing glutamic acid N,N-diacetic acid or a salt thereof (GLDA) and/or methylglycine N,N-diacetic acid or a salt thereof (MGDA), a corrosion inhibitor, and a surfactant, and the use thereof.