Abstract: The embodiments of the present invention provide a method, an apparatus and a system for detecting abnormal behavior of an user which belong to the field of computer technologies. The method includes acquiring time series data, wherein the time series data are configured to describe at least one network behavior, and determining that the user corresponding to the at least one network behavior has the abnormal behavior, when the acquired time series data are not stable. The time series data more accurately describe the network behavior of the user, therefore it is of high accuracy that determining the user has the abnormal behavior when the time series data are not stable, and the user experience is improved when surfing the internet. In addition, determining whether the user has the abnormal behavior according to the stationarity of the time series data is highly accurate and highly efficient.

Abstract: A data processing method includes: generating at least one incremental decision tree according to incremental data; predicting the incremental data based on multiple model decision trees in a classification model and the at least one incremental decision tree to obtain prediction results; and updating the classification model according to the prediction results. In the data processing method according to an embodiment of the present invention, by generating the at least one incremental decision tree according to the incremental data, and then predicting the incremental data based on the model decision trees in the classification model and the at least one incremental decision tree, and updating the classification model according to the prediction results, a self-adaptive update of the classification model is achieved, and a manual intervention during a business cycle of the classification model is not needed, so that the cost is saved greatly.

Abstract: A permanent magnet material and a method thereof. The permanent magnet material comprises one or more rare earth elements and one or more transition metal elements, wherein the atomic percentage of the one or more rare earth elements is less than or equal to 13%, and the permanent magnet material has a maximum magnetic energy product of greater than or equal to 18 MGOe.

Abstract: A permanent magnet material and a method thereof. The permanent magnet material comprises one or more rare earth elements and one or more transition metal elements, wherein the atomic percentage of the one or more rare earth elements is less than or equal to 13%, and the permanent magnet material has a maximum magnetic energy product of greater than or equal to 18 MGOe.