Abstract: A method for evaluating a movement state of a heart is provided and includes: obtaining a plurality of consecutive heart ultrasound images corresponding to a heart and accordingly estimating a plurality of left ventricular volumes corresponding to the heart ultrasound images; finding a plurality of specific extremums in the left ventricular volumes and accordingly estimating a plurality of time differences among the specific extremums; estimating a statistical characteristic value of the time differences based on the time differences; and determining that an abnormal movement state of the heart occurs in response to determining that at least one of the time differences deviates from the statistical characteristic value up to a predetermined threshold.

Abstract: In accordance with one or more embodiments of the present disclosure, a low-density treatment fluid includes a base water-control system and at least one light-weight filler material. The base water-control system may include an inorganic material system comprising an aqueous colloidal silica and a water-soluble chemical activator for gelling the colloidal silica, or the base water-control system may include an organic material system comprising of polymeric material. The low-density treatment fluid may have a density of from 0.1 g/cm3 to 0.75 g/cm3. Also described are methods of recovering a target fluid from a subterranean cavity using such a low-density treatment fluid.

Abstract: A pollen polysaccharide extract prepared by the following method: mixing rape pollen with water, then heating and stirring for extraction, filtering, mixing filtrates, adding chitosan to a resulting filtrate to obtain a liquid to be clarified, keeping the liquid to be clarified at 60-80° C. for at least 1 h, cooling and allowing to stand, and performing solid-liquid separation to obtain a liquid, namely the pollen polysaccharide extract.

Abstract: A traction battery heating circuit, system, and control method, and an electric device are provided. In some embodiments, the traction battery heating circuit includes: a power supply module, including at least one battery group; an inverter module, connected to the power supply module and including an M-phase leg circuit, where the leg circuit is connected in parallel to the battery group, and M is an even multiple of three; a driving module, including a motor having M windings, where the M windings are respectively connected to M phase legs of the leg circuit in one-to-one correspondence; and a control module, connected to the leg circuit, configured to control upper legs of at least three phase legs in the leg circuit and lower legs of the same number of phase legs in remaining legs to be turned on.

Abstract: A method and an apparatus for controlling a camera, and a medium and an electronic device are disclosed. The method includes: acquiring head portrait information of a teacher in a video frame image of a live classroom in real time; analyzing the head portrait information to acquire organ identification information of each organ, wherein the organ identification information is used to indicate whether the organ exists; determining an orientation type of a face in the head portrait information based on the organ identification information, wherein the orientation type comprises a forward type, a lateral type, and a backward type; controlling the camera to focus on the teacher in response to the orientation type being the forward type; and controlling the camera to focus on a blackboard in response to the orientation type being the backward type or the lateral type.

Abstract: A semiconductor device package includes a substrate having a surface, a conductive element disposed on the surface of the substrate, and an encapsulant disposed on the surface of the substrate and covering the conductive element. The conductive element has an upper surface facing away from the substrate and exposed from the encapsulant. Further, a roughness of the upper surface of the conductive element is greater than a roughness of a side surface of the conductive element.

Abstract: This disclosure relates to acidizing retarder compositions and methods of reducing the rate of carbonate dissolution in carbonate acidizing treatments of carbonate formations using the acidizing retarder compositions. The methods may include dissolving one or more retarder compounds in a solution comprising a strong acid to form acidizing retarder compositions, and introducing the acidizing retarder compositions to carbonate formations. The acidizing retarder compositions may include one or more retarder compounds and a strong acid. At least one of the one or more retarder compounds may be a poloxamer. A concentration of the strong acid in the acidizing retarder composition may be 5 weight percent or greater.

Abstract: An image processing apparatus for evaluating cardiac images and a ventricular status identification method are provided. In the method, a region of interest (ROI) is determined from multiple target images, a variation in grayscale values of multiple pixels in the ROIs of each target image is determined, and one or more representative images are obtained according to the variation in the grayscale values. The target image is related to the pixels within an endocardial contour of a left ventricle. A boundary of the ROI is approximately located at two sides of a bottom of the endocardial contour. The ROI corresponds to a mitral valve. The variation in the grayscale values is related to a motion of the mitral valve. The representative image is for evaluating a status of the left ventricle.

Abstract: According to embodiments disclosed herein, a gel fluid composite may include a nanosilica gel and a plurality of quantum dot tracers. The nanosilica gel may be configured to seal one or more downhole fractures in a wellbore. The plurality of quantum dot tracers may be dispersed in the nanosilica gel. The plurality of quantum dot tracers may each include a semiconductor particle core housed in a silica shell.

Abstract: The cathode material of the invention has a porous structure, wherein the pore volume of mesoporous with pore diameter of 2-20 nm accounts for 90% or more of the total pore volume. As compared with conventional lithium-ion battery cathode material, the lithium-ion battery cathode material of the present invention contains mainly mesopores, and the pore size of mesopores is mostly in the range of 2-20 nm.

Abstract: Systems, methods, and software can be used to provide reminding information. In some aspect, a special event is determined to occur. In response to determining that the special event occurs, a network type currently used by a device is acquired. Historical network usage information corresponding to the network type is determined. The network type and a traffic usage situation is outputted based on the historical usage information.

Abstract: A silicon oxide Janus nanosheets relatively permeability modifier (RPM) for carbonate and sandstone formations. The silicon oxide Janus nanosheets RPM may be used to treat a water and hydrocarbon producing carbonate or sandstone formation to reduce water permeability in the formation and increase the production of hydrocarbons. The silicon oxide Janus nanosheets RPM for carbonate formations includes a first side having negatively charged functional groups and a second side having alkyl groups. The silicon oxide Janus nanosheets RPM for sandstone formations includes a first side having positively charged functional groups and a second side having alkyl groups. The negatively charged functional groups may include a negatively charged oxygen group groups and hydroxyl groups. The positively charged functional groups may include amino groups and an amine.

Abstract: Nanoparticle compositions for delivery of nucleic acids to subjects including carriers comprising polyester (PE) dendrimers or dendrons, and therapeutic or immunogenic nucleic acid agents enclosed within the PE are described. Methods for treating or preventing diseases or conditions in a subject by administering the nanoparticle compositions that provide immune responses and synergistic therapeutic or preventive effects are provided.

Abstract: According to embodiments disclosed herein, a gel fluid composite may include a nanosilica gel and a plurality of quantum dot tracers. The nanosilica gel may be configured to seal one or more downhole fractures in a wellbore. The plurality of quantum dot tracers may be dispersed in the nanosilica gel. The plurality of quantum dot tracers may each include a semiconductor particle core housed in a silica shell.

Abstract: An automatic activator coating device for wire and arc additive manufacture includes a base, a mechanical arm is arranged on the upper side of the base, a clamping mechanism is arranged at the lower end of the mechanical arm, a container bottle is clamped on the clamping mechanism, one end of the container bottle is communicated with a sprayer, one end of the sprayer is communicated with an atomizing nozzle, the container bottle is communicated with the gas bottle, and a gas pressure regulating valve is arranged on the gas bottle; and a piston partition is arranged in the sprayer, the container bottle is communicated with an activator converging cavity in one end of the sprayer, a piston rod and a resetting mechanism are arranged in a mounting cavity in the other end of the sprayer, an open hole is formed in the inner surface of the sprayer

Abstract: A follow-up shooting method and device, a medium and an electronic device are provided. The follow-up shooting method includes: acquiring a video image in a live classroom, wherein the video image comprises at least one object; analyzing the video image to obtain a gesture image for controlling a camera; and determining whether to control the camera to track and shoot an execution object related to the gesture image based on the gesture image.