Abstract: This application can be applicable to the field of the internet of things, and relates to a device registration method, a hub device, and an apparatus. In an example device registration method provided in this application, a hub device may register a target device with the hub device with assistance of first user equipment, and the hub device may register the hub device with a server with assistance of second user equipment. The hub device may register a registered device (which may include the target device that is registered with the hub device) with the server after the hub device registers the hub device with the server.

Abstract: The invention discloses a biaxial test device, comprising: a bracket, a container, a sample setting assembly and a press, etc. Before use, the sample is installed between two limit plates. On the basis of applying confining pressure, the press is started, and the pressure rod moves vertically downward and applies a vertical downward load to the sample. When the sample is subjected to the vertical downward load, axial compression and radial deformation will occur. At this time, the radial deformation of the sample on both sides of the limit plates is limited, and expansion occurs on both sides without the limit plates. Subsequently, under the joint action of the confining pressure and the limit plates, the sample undergoes plane strain. Since the container and the limit plates are both in a transparent state, the side section state of the sample when plane strain occurs can be well observed.

Abstract: Example key negotiation methods and apparatus are described. One example method includes generating, by a first hub device, public key information and private key information of a first electronic device, where the first electronic device accesses a network by using the first hub device. The first hub device reports a first mode of the first electronic device to a cloud device, and obtains public key information of a second electronic device. The first hub device performs key negotiation with the second electronic device based on the private key information of the first electronic device and the public key information of the second electronic device, to generate a first shared key.

Abstract: The invention discloses a biaxial test device, comprising: a bracket, a container, a sample setting assembly and a press, etc. Before use, the sample is installed between two limit plates. On the basis of applying confining pressure, the press is started, and the pressure rod moves vertically downward and applies a vertical downward load to the sample. When the sample is subjected to the vertical downward load, axial compression and radial deformation will occur. At this time, the radial deformation of the sample on both sides of the limit plates is limited, and expansion occurs on both sides without the limit plates. Subsequently, under the joint action of the confining pressure and the limit plates, the sample undergoes plane strain. Since the container and the limit plates are both in a transparent state, the side section state of the sample when plane strain occurs can be well observed.

Abstract: The voltage control method includes: generating a voltage control signal according to a first operating condition information of a direct current converter and a second working operating information of a battery; and according to the voltage control signal, controlling an output voltage of the direct current converter to be less than the maximum charging voltage of the battery.

Abstract: This application can be applicable to the field of the internet of things, and relates to a device registration method, a hub device, and an apparatus. In an example device registration method provided in this application, a hub device may register a target device with the hub device with assistance of first user equipment, and the hub device may register the hub device with a server with assistance of second user equipment. The hub device may register a registered device (which may include the target device that is registered with the hub device) with the server after the hub device registers the hub device with the server.

Abstract: Example key negotiation methods and apparatus are described. One example method includes generating, by a first hub device, public key information and private key information of a first electronic device, where the first electronic device accesses a network by using the first hub device. The first hub device reports a first mode of the first electronic device to a cloud device, and obtains public key information of a second electronic device. The first hub device performs key negotiation with the second electronic device based on the private key information of the first electronic device and the public key information of the second electronic device, to generate a first shared key.

Abstract: A greeting card, including at least a body having at least four surfaces including a front surface, two opposed inner surfaces and a back surface, a holder, and a decorating portion including multiple decorating sheets: the first decorating sheet, the second decorating sheet, . . . , the Nth decorating sheet, and a wire. The body is a folded sheet, a picture is disposed on the front surface of the body, one of the inner surfaces allows a user to write a greeting message thereon, the holder is disposed on the other one of the inner surfaces of the body and operates to receive the decorating portion, the first decorating sheet, the second decorating sheet, . . . , and the Nth decorating sheet each has a first suspension point disposed on an upper edge thereof, the first decorating sheet, the second decorating sheet, . . .

Abstract: Taught is a suspended display apparatus, comprising: a plurality of display boards and hanging wires, the display boards being connected to each other via the hanging wires, wherein a top edge attachment point is set at the center of gravity on the upper edge of each display board, a bottom edge attachment point is set at one end of the lower edge of each display board; and the bottom edge attachment point of the upper display board is connected with the top edge attachment point of the lower display board via the hanging wire. A hanging plate is added on each display board, and is intersected with the display board to adjust the balance and shape of the whole structure. Each display board is featured with two-dimensional picture or three-dimensional physical model, which can rotate freely in a range of 0 to 360 degrees.

Abstract: Provided is a circular advertising frame for receiving a picture, comprising a main frame, a socket half-frame, an insert half-frame, a hanging ring, a concave-convex locking device, and a diaphragm. The circular advertising frame features convenient hanging, easy picture replacement, good stability, esthetic shape and light weight.

Abstract: Provided is a circular advertising frame for receiving a picture, comprising a main frame, a socket half-frame, an insert half-frame, a hanging ring, a concave-convex locking device, and a diaphragm. The circular advertising frame features convenient hanging, easy picture replacement, good stability, esthetic shape and light weight.