Abstract: The present disclosure provides a display device, a wearable display device, and method for determining gaze positions, and relates to the field of virtual reality technologies. Because the display device has a high efficiency in processing an electric signal transmitted by each of photoelectric sensor assemblies is high, the display device is capable of quickly determining a gaze position of eyes of a user on a display panel based on the electric signal transmitted by each of the photoelectric sensor assemblies. In this way, the efficiency of displaying images by the display panel is further improved, and thus a higher refresh rate of the display panel is achieved.

Abstract: The present application discloses a display panel and a preparation method thereof, and a display device. The display panel includes a base substrate, and has a display area, a peripheral area surrounding the display area, a hole area located at the display area, and an isolation area located between the hole area and the display area. The display area includes an electroluminescent device located on the base substrate, and a packaging structure for sealing the electroluminescent device, the packaging structure includes an inorganic packaging layer and an organic packaging layer alternately stacked, and the inorganic packaging layer extends to the hole area. The isolation area includes an organic layer located on the inorganic packaging layer.

Abstract: An esterification method for improving the dispersibility of a hydroxyl-containing nano-material is disclosed herein. The method comprises: S1, thoroughly stirring and uniformly mixing a hydroxyl-containing nano-material precursor and an organic solvent to obtain a mixture; S2, heating and fully pre-reacting the mixture in step S1; and S3, adding an acyl halide to the solution which is heated and fully pre-reacted in step S2, and then further reacting same to finally obtain a surface-modified hydroxyl-containing nano-material.

Abstract: A high-efficiency and short-process method for preparing a high-strength and high-conductivity copper alloy is disclosed, comprising the following steps: performing horizontal continuous casting to obtain an as-cast primary billet of copper alloy, wherein the alloying elements in the obtained as-cast primary billet being in a supersaturated solid solution state; after peeling the obtained as-cast primary billet, directly performing continuous extrusion, cold working and aging annealing treatment to obtain a copper alloy, and keeping the alloying elements of the billet in a supersaturated solid solution state during the process of continuous extrusion. The method shortens the flow, reduces energy consumption and improves the product forming rate.

Abstract: Disclosed is an ultrasonic blood perfusion imaging method for a single blood vessel, comprising: setting an ultrasound focusing label point in a blood vessel contour of a blood vessel to be measured in a region to be measured; obtaining a preactivated ultrasound image of the region to be measured when an ultrasound contrast agent is in an inactive state; activating the ultrasound contrast agent; obtaining an activated ultrasound image of the region to be measured when the ultrasound contrast agent is in an activated state; obtaining an activation map of the ultrasound contrast agent in the blood vessel to be measured; and obtaining a blood flow perfusion distribution map of the blood vessel to be measured. The ultrasound contrast agent is activated at the ultrasound focusing label point causing liquid-to-gas conversion, and the ultrasound signal changes from dark to bright.

Abstract: Disclosed are a film-forming agent composition for contrast agent, a film-forming lipid solution including the film-forming agent composition, a contrast agent including the film-forming lipid solution, and a preparation method thereof. The film-forming agent composition for contrast agent includes a lipid, an emulsifier and a surface charge modifier; relative to 100 parts by weight of the lipid, the content of the emulsifier is 20-50 parts by weight, and the content of the surface charge modifier is 10-35 parts by weight; and the lipid is a carboxylated phospholipid, and the surface charge modifier is a polyelectrolyte. Based on the composition, the nanodroplets of the resulting contrast agent have more uniform particle size, higher stability and better controllability, as well as a lower threshold value for ultrasonic gasification.

Abstract: Disclosed is a super-resolution flow field reconstruction method, including: superimposing a plurality of frames of contrast-enhanced ultrasound images that are in one time interval and each of which includes images of a plurality of microbubbles, to obtain a superimposed image including a plurality of microbubble trajectories of the plurality of microbubbles; performing straight line fitting on the plurality of microbubble trajectories, to obtain a plurality of microbubble trajectory straight lines of the plurality of microbubbles, respectively; determining directions and velocities of instantaneous movements of the plurality of microbubbles in the time interval; and reconstructing a super-resolution flow field.