Abstract: A density inversion method comprises acquiring local gravity anomalies of a target body to be measured at many measurement points within a target measurement area; acquiring information of distance between a center position of an area the target body being located and a specified boundary of the target measurement area; determining a target inversion depth to be used in density inversion for the target body based on the information of distance and the specified depth; and substituting the local gravity anomaly of the target body at each measurement point and the target inversion depth into a preset layer density inversion formula which is a transform formula of a density inversion formula in the case of a constant density in a longitudinal cross-section, to obtain a density distribution of the target body in a transverse cross-section. The accuracy of the density distribution obtained through the density inversion can be improved.

Abstract: Disclosed are density determination method, apparatuses, and electronic device, applied in geophysical exploration, comprising: acquiring Bouguer gravity anomalies at measurement points for a target body to be measured; determining a Bouguer gravity anomaly of the target body for each measurement point as a first anomaly based on the Bouguer gravity anomalies at the measurement points, and determining a Bouguer gravity anomaly of a reference body corresponding to the target body to be measured at the measurement point as a second anomaly at the measurement point, based on the Bouguer gravity anomalies at the measurement points; calculating a difference between the first anomaly and the second anomaly at the measurement point as a local gravity anomaly; and performing density inversion on the target body to be measured to obtain density distribution in transverse cross-section of the target body, thereby obtaining the density of the target body more accurately.

Abstract: Disclosed are method and apparatus for obtaining residual gravity anomaly. The method comprises obtaining Bouguer gravity anomaly of a target region, determining a first pre-set range corresponding to each sampling point in the target region, obtaining a first regional field value of each sampling point in the first pre-set range through a surface fitting method based on the coordinate and field value of the sampling point, traversing the target region to obtain first regional gravity anomaly of the target region according to the first regional field values of the sampling points in the target region, and obtaining first residual gravity anomaly of the target region according to the Bouguer gravity anomaly and the first regional gravity anomaly. The residual gravity anomaly thus obtained is more accurate, thus enabling an accurate prediction of an underground geological body.

Abstract: Disclosed are method and apparatus for obtaining residual gravity anomaly. The method comprises obtaining Bouguer gravity anomaly of a target region, determining a first pre-set range corresponding to each sampling point in the target region, obtaining a first regional field value of each sampling point in the first pre-set range through a surface fitting method based on the coordinate and field value of the sampling point, traversing the target region to obtain first regional gravity anomaly of the target region according to the first regional field values of the sampling points in the target region, and obtaining first residual gravity anomaly of the target region according to the Bouguer gravity anomaly and the first regional gravity anomaly. The residual gravity anomaly thus obtained is more accurate, thus enabling an accurate prediction of an underground geological body.

Abstract: A hearing protection method, an apparatus and a system are provided. the start command input by the user is received by the hearing protection apparatus to activate the hearing protection mode; the sound data in multiple dimensions is collected and whether the sound data in any of the dimensions is within a corresponding preset threshold is determined; and corresponding prompt information is sent when the sound data in any of the dimensions exceeds the corresponding preset threshold Thus, various prompting manners are provided to remind the user to make corresponding adjustments, thereby achieving the purpose of hearing protection, and effectively adapting to the needs of specific users.

Abstract: A hearing protection method, an apparatus and a system are provided. the start command input by the user is received by the hearing protection apparatus to activate the hearing protection mode; the sound data in multiple dimensions is collected and whether the sound data in any of the dimensions is within a corresponding preset threshold is determined; and corresponding prompt information is sent when the sound data in any of the dimensions exceeds the corresponding preset threshold Thus, various prompting manners are provided to remind the user to make corresponding adjustments, thereby achieving the purpose of hearing protection, and effectively adapting to the needs of specific users.