2 results about "Prolongation" patented technology

The invention provides an elastic wave vector imaging method and device, a storage medium and an apparatus. The method comprises the steps of building a conversion relation between group angles and polarizing angles by using the P wave speed of a set direction of an anisotropic medium of each point in an imaging area, the S wave speed of each set direction and anisotropic parameters; using an elastic wave equation to perform wave field depth prolongation of multi-component earthquake data in the imaging area to obtain a focus forward propagation wave field and a shot record back propagation wave field and corresponding Poynting vectors; according to set time intervals, decomposing the focus forward propagation wave field and the shot record back propagation wave field by using the Poyntingvectors and the conversion relation between group angles and polarizing angles; performing vector imaging of elastic waves in anisotropic media by using wave field decomposition results correspondingto all shots in the multi-component earthquake data. The imaging efficiency and accuracy can be improved.

The invention belongs to the field of medicines and relates to a cefmetazole crystal-form compound and a preparation method thereof. The cefmetazole crystal-form compound and the preparation method thereof, provided by the invention, are used for improving the quality stability of cefmetazole and safety in clinical medication. Shown by parameters such as melting point, IR and PXRD, the cefmetazole crystal-form compound is different from any novel crystal form in the prior art; compared with the existing cefmetazole on the market, the crystal-form compound has the advantages that the content of related substances is extremely low, the stability is high, and the content of related impurities is free of obvious increase along with the prolongation of storage time, so that the cefmetazole crystal-form compound is suitable for serving as a standard in detection analysis or quality control.