Abstract: Disclosed are molybdenum trioxide with a novel molecular structure and a chiral octahedral crystal phase structure, octamolybdate of the molybdenum trioxide and a preparation method of the octamolybdate. A molecular formula of ?-MoO3 with the novel molecular structure and the chiral octahedral crystal phase structure is Mo8O24, and the generated nano-molybdate based on the octamolybdate is a new species, so that a new member is added to inorganic salt chemical industry, and an application of the nano-molybdate changes all aspects of daily life of people, for example, the nano-molybdate having a disinfection function and insoluble in water is used in agricultural crop production and quality improvement, freshwater aquaculture and mariculture, sanitary disinfection, various anti-microbial and anti-tumor activities, batteries and various energy storages, semi-conductors, anti-biochemical weapons, intelligent materials and other aspects.

Abstract: Disclosed herein are methods for a multiple degree-of-freedom (DOF) motor system with reduced number of electromagnet control phases. The motor system includes a first body that is able to move relative to a second body along multiple DOFs. The first body has at least one magnetic positioner attached. The second body has a plurality of controlled electromagnets. Control signals, the total number of phases of which is less than half the total number of electromagnets, energize at least one of the controlled electromagnets to create magnetic interaction with at least one magnetic positioner on the first body, and to control the movement of the first body relative to the second body along designated dimension(s).

Abstract: A method and device for controlling an unmanned aerial vehicle with a gesture are provided. A camera is arranged in the unmanned aerial vehicle, and the method includes: detecting a gesture in an image by using a gesture detection framework; judging whether the gesture is a predetermined gesture for controlling the unmanned aerial vehicle; acquiring a motion trajectory of the gesture in a case that it is determined that the gesture is the predetermined gesture for controlling the unmanned aerial vehicle; and controlling, based on the motion trajectory of the gesture, the unmanned aerial vehicle to perform a control operation corresponding to the motion trajectory of the gesture, where a correspondence between a motion trajectory of a gesture and a control operation is predetermined.

Abstract: Disclosed herein are methods for a multiple degree-of-freedom (DOF) motor system with reduced number of electromagnet control phases. The motor system includes a first body that is able to move relative to a second body along multiple DOFs. The first body has at least one magnetic positioner attached. The second body has a plurality of controlled electromagnets. Control signals, the total number of phases of which is less than half the total number of electromagnets, energize at least one of the controlled electromagnets to create magnetic interaction with at least one magnetic positioner on the first body, and to control the movement of the first body relative to the second body along designated dimension(s).

Abstract: A method and device for controlling an unmanned aerial vehicle with a gesture are provided. A camera is arranged in the unmanned aerial vehicle, and the method includes: detecting a gesture in an image by using a gesture detection framework; judging whether the gesture is a predetermined gesture for controlling the unmanned aerial vehicle; acquiring a motion trajectory of the gesture in a case that it is determined that the gesture is the predetermined gesture for controlling the unmanned aerial vehicle; and controlling, based on the motion trajectory of the gesture, the unmanned aerial vehicle to perform a control operation corresponding to the motion trajectory of the gesture, where a correspondence between a motion trajectory of a gesture and a control operation is predetermined.

Abstract: A method and a device for controlling an unmanned aerial vehicle (UAV) to follow face rotation are provided. The UAV is provided with a camera, the method includes: detecting a face in an image based on the Viola-Jones face detection framework; tracking the face and determining two-dimensional position of the facial feature on the face in pixel coordinates; obtaining three-dimensional position of the facial feature in world coordinates by looking up a standard three-dimensional face database; obtaining the three-dimensional position, in camera-centered coordinates, of the face on the UAV based on the two-dimensional position of the facial feature in the pixel coordinates and the three-dimensional position of the facial feature in world coordinates; and controlling, based on the three-dimensional position, in camera-centered coordinates, of the face on the UAV, the UAV to adjust its position to make the camera is aligned to the face.

Abstract: A method and a device for flying an unmanned aerial vehicle in a handheld manner and an unmanned aerial vehicle are provided. The method includes: judging whether the unmanned aerial vehicle is triggered to enter a flight standby state; determining whether the unmanned aerial vehicle is in a handheld flat-laying state for a predetermined time period when it enters the flight standby state; and comparing a state parameter of the unmanned aerial vehicle with the state parameter thereof at a previous time instant to judge whether it is released when it is in the handheld flat-laying state, and controlling its rotor wing to rotate for flight when the unmanned aerial vehicle is released. The method is easy to implement, the elimination of the remote control results in a cost saving and the user does not need to operate the remote control.

Abstract: A method and a device for retrieving an unmanned aerial vehicle by a hand and an unmanned aerial vehicle are provided. The method includes: detecting a state parameter of the unmanned aerial vehicle in real time; determining whether the unmanned aerial vehicle is disturbed by a hand according to the state parameter of the unmanned aerial vehicle; and controlling a rotor wing of the unmanned aerial vehicle to stop rotation if it is determined that the unmanned aerial vehicle is disturbed by the hand. The unmanned aerial vehicle is retrieved directly by the hand without using a remote control device.

Abstract: A method and a device for flying and retrieving an unmanned aerial vehicle are provided. The method includes: detecting a state parameter of the unmanned aerial vehicle in real time; judging, based on the state parameter, whether the unmanned aerial vehicle is to be flown or to be retrieved in the handheld way; and controlling a rotor wing to rotate to take off, in a case of determining that the unmanned aerial vehicle is to be flown in the handheld way; or controlling the rotor wing to stop rotating, in a case of determining that the unmanned aerial vehicle is to be retrieved in the handheld way. With the method according to the present disclosure, a user can fly and retrieve the unmanned aerial vehicle without using a remote control device and the unmanned aerial vehicle becomes free from the control of other devices.

Abstract: An interface for a communications channel, in which blocks of data are divided into multiple sub-blocks for conveyance, such as a USB (Universal Serial Bus) interface, is virtualized. One or more host drivers may provide an interface with a physical device that supports the communications channel. Virtualization software emulates a virtual device that appears to support the communications channel, and one or more guest drivers may provide an interface with the virtual device, so that the guest drivers receive one or more guest data block buffers for use in conveying data over the communications channel and generate multiple corresponding guest data sub-block buffers for each guest data block buffer, and the virtualization software obtains access to the guest data sub-block buffers. The guest data sub-block buffers are scanned for an indication of a boundary between multiple guest data block buffers, such as an IOC (Interrupt on Complete) flag being set.