Abstract: The present invention relates to a method for preparing high-purity vanadium pentoxide from vanadium-bearing shale by all-wet process. The technical solution is: the “Gradient continuous leaching system of vanadium-bearing shale” is used to wet activate and compound leach vanadium-bearing shale to obtain vanadium-containing acid leachate. The “pH adjusting device of the vanadium-containing acid leachate” is used to adjust the pH of vanadium-containing acid leaching leachate. The post-treatment solution is subjected to hydroxime countercurrent extraction after oxidation, and the raffinate returns to the water using in the wet activation and electrodialysis after neutralization, and the loaded organic phase is regenerated by countercurrent reduction stripping. The regenerated organic phase directly returns to hydroxime countercurrent extraction.

Abstract: The present disclosure relates to a device and a system for testing flatness. The device for testing flatness includes a base, a testing platform, and a ranging sensor. The testing platform is assembled on the base. The testing platform includes a supporting structure. The supporting structure is disposed on the side of the testing platform away from the base and is used to support a to-be-tested board. The structure matches the structure of the to-be-tested board. The ranging sensor is disposed on the side of the testing platform away from the base. After the to-be-tested board is placed on the testing platform, the ranging sensor is used to test distances between a number N of to-be-tested positions on the to-be-tested board and the ranging sensor, to obtain N pieces of distance information, and the N pieces of distance information are used to determine the flatness of the to-be-tested board, where N is an integer greater than 2.

Abstract: A dual-screen electronic apparatus is provided. The apparatus includes: a first display screen with a first physical border; a second display screen with a second physical border; and a processor, configured to control display of the first display screen and the second display screen. In response to a first mode of use, a first portion of the second physical border and a second portion of the first physical border are hidden from view; and in response to a second mode of use, the first display screen is arranged on a first surface of the dual-screen electronic apparatus, and the second display screen is arranged on a second surface of the dual-screen electronic apparatus, the first surface being opposite to the second surface.

Abstract: A dual-screen electronic apparatus is provided. The apparatus includes: a first display screen with a first physical border; a second display screen with a second physical border; and a processor, configured to control display of the first display screen and the second display screen. In response to a first mode of use, a first portion of the second physical border and a second portion of the first physical border are hidden from view; and in response to a second mode of use, the first display screen is arranged on a first surface of the dual-screen electronic apparatus, and the second display screen is arranged on a second surface of the dual-screen electronic apparatus, the first surface being opposite to the second surface.

Abstract: An electronic device is provided for solving a technical problem existed in the prior art that an electronic device is incapable of supporting itself independently. The electronic device includes a first component including a display unit, where the display unit is arranged on a first surface of the first component; and a second component including a connecting member and a supporter, where the second component is arranged at a first side portion of the first component. The supporter is movable with respect to the first component via the connecting member, and when the supporter moves to a first relative position with respect to the first component, the supporter may be used to support the first component.

Abstract: An electronic device according to the present application includes a main body and a display unit, the main body includes a first side portion and a second side portion, the second side portion is a side portion opposite to the first side portion, a thickness of the main body has a tendency of being smaller in a direction from the first side portion to the second side portion; the display unit is provided on a first surface of the main body, a first groove is provided on a second surface of the main body to form an accommodating space. The accommodating space is adapted to accommodate auxiliary tools, therefore the electronic device may provide the accommodating space for the auxiliary tools by itself, and it is more convenient for users to use the electronic device.

Abstract: An electronic device is provided for solving a technical problem existed in the prior art that an electronic device is incapable of supporting itself independently. The electronic device includes a first component including a display unit, where the display unit is arranged on a first surface of the first component; and a second component including a connecting member and a supporter, where the second component is arranged at a first side portion of the first component. The supporter is movable with respect to the first component via the connecting member, and when the supporter moves to a first relative position with respect to the first component, the supporter may be used to support the first component.

Abstract: An electronic device according to the present application includes a main body and a display unit, the main body includes a first side portion and a second side portion, the second side portion is a side portion opposite to the first side portion, a thickness of the main body has a tendency of being smaller in a direction from the first side portion to the second side portion; the display unit is provided on a first surface of the main body, a first groove is provided on a second surface of the main body to form an accommodating space. The accommodating space is adapted to accommodate auxiliary tools, therefore the electronic device may provide the accommodating space for the auxiliary tools by itself, and it is more convenient for users to use the electronic device.

Abstract: The present invention discloses an authentication method based on private bytes of USB flash memory media, and implements a unit for executing authentication by using private bytes of USB flash memory media which is often used. A control chip of the USB flash memory disk receives a read/write instruction sent from the authentication unit, determines whether a read/write operation is executed to the private bytes. If it is, the read/write operation to the private bytes is executed. Otherwise, the read/write operation to normal bytes is executed. Thus, a variety of authentication information can be stored in the private bytes of the USB flash memory disk, which are invisible to users and can not be copied and deleted. The normal data can be stored in the normal bytes of the USB flash memory disk so that an encryption and authentication mechanism can be achieved with security and convenience.