Abstract: The present disclosure provides novel techniques to segment mobile entities based on signals from mobile devices associated with these mobile entities. In certain embodiments, a data file is built for each mobile entity to transform originally extremely high dimensional raw data derived from mobile devices communicating with a network into structured data characterizing associated mobile entities. The data files are structured for filtering and searching with respect to features associated with the signals from mobile devices, including location and non-location features. The data files are used to determine feature gains corresponding respectively to features related to a mobile segment. The features include first features of a first type and second features of a second type. The feature gains are used, among other things, to rank mobile entities for the mobile segment, with feature gains corresponding to the first features given a larger weight than feature gains corresponding to the second features.

Abstract: A method for compact and flat bismuth metal preparation by electrolysis is provided. In the method, one or more of ?-naphthol, acacia, sulfonated and vulcanized alkylphenol ethoxylate and naphthol ethoxylate oxides are added to the acidic solution of bismuth methanesulfonate as additives, and the cathodic bismuth is obtained by electrolysis at 20-80° C. The method for bismuth metal preparation is simple and easy to promote, environment-friendly, and the obtained bismuth metal has a flat and compact surface and good plate formation effect.

Abstract: A composite polyvinyl alcohol (PVA) preservative film, a preparation method and an application thereof are provided. The film includes PVA of 9-12 parts, modified silicon dioxide nanoparticles of 2-5 parts, antimicrobial of 0.3-2 parts and deionized water of 100 parts. Fruits and vegetables sensitive to sunlight have lower requirements for illumination while preserving. With PVA as matrix and silicon dioxide (SiO2) nanoparticles as modified materials, composite PVA is obtained by controlling a particle size of SiO2 and modifying its surface. The composite PVA preservative film takes advantages of different refractive indexes between PVA and SiO2 and controlling the particle size of SiO2, thereby having a low luminous transmittance. The preservative film has an effect of light-proof on fruits and vegetables suitable for light-proof storage, and improves its gas transmission and water resistance because of adding SiO2, thereby facilitating packaging preservation of the fruits and vegetables.

Abstract: A frequency measurement method is provided, which comprising: sampling a voltage to be measured with a fixed sampling frequency; obtaining a positive-sequence voltage angle change amount for a predetermined operation interval time by using a sampling sample obtained by the sampling and based on a discrete Fourier transform (DFT) calculation; obtaining a frequency offset amount by using the positive-sequence voltage angle change amount; and obtaining a frequency-related measurement value by using the frequency offset amount. A frequency measurement apparatus is also provided. measurement value. This frequency measurement method does not require iterative calculations, and directly obtains frequency-dependent measurement values, thereby responding quickly to frequency changes. In addition, a frequency measurement apparatus is also provided.

Abstract: The present disclosure relates to an information recommendation device, method, and computer-readable storage medium, and relates to the technical field of computer. The information recommendation device includes: a receiver configured to receive a communication identifier of a contact of a recommended user; a processor configured to acquire a user identifier corresponding to the communication identifier of the contact, and acquire shopping information of the contact according to the user identifier; and a transmitter configured to recommend the shopping information of the contact to the recommended user.

Abstract: A frequency measurement method is provided, which comprising: sampling a voltage to be measured with a fixed sampling frequency; obtaining a positive-sequence voltage angle change amount for a predetermined operation interval time by using a sampling sample obtained by the sampling and based on a discrete Fourier transform (DFT) calculation; obtaining a frequency offset amount by using the positive-sequence voltage angle change amount; and obtaining a frequency-related measurement value by using the frequency offset amount. A frequency measurement apparatus is also provided. measurement value. This frequency measurement method does not require iterative calculations, and directly obtains frequency-dependent measurement values, thereby responding quickly to frequency changes. In addition, a frequency measurement apparatus is also provided.

Abstract: Provided are a system frequency measurement method, synchrophasor measurement method and device. The synchrophasor measurement method comprises: sampling voltage and current signals based on an absolute time reference; removing out-of-band interference in the sampled voltage and current signals; first-resampling at least one of the voltage and current signals with the out-of-band interference being removed based on an estimated system frequency; calculating phasor for the signals obtained from the first resampling and updating the estimated system frequency; for a reporting timing, second-resampling the voltage and current signals with the out-of-band interference being removed based on the updated estimated system frequency; and calculating synchrophasor of the voltage and current signals obtained from the second resampling.

Abstract: Provided are a system frequency measurement method, synchrophasor measurement method and device. The synchrophasor measurement method comprises: sampling voltage and current signals based on an absolute time reference; removing out-of-band interference in the sampled voltage and current signals; first-resampling at least one of the voltage and current signals with the out-of-band interference being removed based on an estimated system frequency; calculating phasor for the signals obtained from the first resampling and updating the estimated system frequency; for a reporting timing, second-resampling the voltage and current signals with the out-of-band interference being removed based on the updated estimated system frequency; and calculating synchrophasor of the voltage and current signals obtained from the second resampling.