Abstract: The present invention relates to a ceramic tracing proppant, and belongs to the field of oil and gas exploitation aids. The ceramic tracing proppant of the present invention is mainly prepared from a neutron absorbing material and the following raw materials in parts by weight: 60-90 parts of bauxite, 30-90 parts of kaolin, and 1-5 parts of fluorite. The ceramic tracing proppant of the present invention has a very high compressive strength under a relatively low density, can effectively prop formation cracks, ensure a fracturing effect and provide an efficient channel for oil and gas output, and has a wide raw material source and a relatively low cost. In addition, the neutron absorbing material is used and fused with an existing neutron logging technology, such that permanent tracing can be achieved under non-radioactive conditions, and the crack height can be effectively, accurately, and quantitatively determined.

Abstract: A method for rapidly acquiring multi-field response of mining-induced coal rock is provided. Based on 3D printing, the method achieves the control of material deformation and turns from 3D to 4D, thus saving manpower and material resources; further, repeated experiments may still be carried out under approximately the same conditions after each printing, so that the similarity of similarity simulations is greatly improved and a stable and reliable scientific law is conveniently obtained; besides, a BP neural network model may be built based on the data collected from similarity simulations to rapidly acquire an accurate and real coal seam mining response.

Abstract: The present invention relates to a new crystalline form of dapagliflozin represented by formula (I). The crystalline form has a characteristic absorption peak at about 4.318 (20.45) in an X-ray powder diffraction pattern shown by angle 2 theta and interplanar spacing (value d). It can be prepared by dissolving dapagliflozin in good organic solvents, adding poor solvents, stirring to crystallization, filtering and drying. The new crystalline form of dapagliflozin of the present invention has the following superior features: good solubility, low hygroscopicity, high stability and good preparation reproducibility.

Abstract: A crystalline form of dapagliflozin represented by formula (I) is provided. The crystalline form has a characteristic absorption peak in an X-ray powder diffraction pattern at a diffraction angle 2? and interplanar spacing (value d) at about 4.318 (20.45) in an X-ray powder diffraction pattern. The crystalline form can be prepared by dissolving dapagliflozin in good organic solvents, adding poor solvents, stirring to crystallization, filtering and drying. The provided crystalline form of dapagliflozin has the following features: good solubility, low hygroscopicity, high stability and good preparation reproducibility.