Abstract: The present disclosure relates to the field of environment monitoring equipment, and in particular, to a device for determining threshold wind speed in intermittent wind-sand flow. The device includes a base. A rotary bearing is installed on the base. A circuitry is installed in the base. A telescopic rod is installed through the rotary bearing. A wind driven vane and an earth surface wind-sand monitoring frame are installed on the telescopic rod. Photoelectric induction probes are installed on the earth surface wind-sand monitoring frame.

Abstract: According to embodiments described herein there is provided methods and apparatus for providing communications to a wireless device using device-to-device communication with an unmanned vehicle. A method in a wireless device comprises establishing a device-to-device, D2D, wireless connection to the unmanned vehicle; and responsive to receiving an operation command over the D2D wireless connection, performing an operation. A method in an unmanned vehicle comprises determining a current location of a wireless device; travelling to within a wireless range of the current location of the wireless device; establishing a device-to-device, D2D, wireless connection with the wireless device; and transmitting an operation command to the wireless device over the D2D wireless connection to instruct the wireless device to perform an operation.

Abstract: According to embodiments described herein there is provided methods and apparatus for providing communications to a wireless device using device-to-device communication with an unmanned vehicle. A method in a wireless device comprises establishing a device-to-device, D2D, wireless connection to the unmanned vehicle; and responsive to receiving an operation command over the D2D wireless connection, performing an operation. A method in an unmanned vehicle comprises determining a current location of a wireless device; travelling to within a wireless range of the current location of the wireless device; establishing a device-to-device, D2D, wireless connection with the wireless device; and transmitting an operation command to the wireless device over the D2D wireless connection to instruct the wireless device to perform an operation.