Education is a great cause to achieve national prosperity, national rejuvenation and people’s happiness, and an important way to block the intergenerational transmission of poverty. Rural revitalization, education fi...Education is a great cause to achieve national prosperity, national rejuvenation and people’s happiness, and an important way to block the intergenerational transmission of poverty. Rural revitalization, education first. Rural children’s education is an important issue of rural revitalization. This paper takes rural children, especially left behind children and children in distress as the help objects, and uses the advantages of “Internet plus” to improve the system, strengthen family education guidance, integrate social love resources, etc., to solve the problems faced by rural children, such as no guidance in learning, lack of guidance in behavior, lack of care in life, promote the overall healthy development of rural children, and solve the problem of rural education backwardness.展开更多
Remarkable progress has been made in satellite-based quantum key distribution [QKD],which can effectively provide QKD service even at the intercontinental scale and construct an ultralong-distance global quantum netwo...Remarkable progress has been made in satellite-based quantum key distribution [QKD],which can effectively provide QKD service even at the intercontinental scale and construct an ultralong-distance global quantum network.But there are still some places where terrestrial fiber and ground stations cannot be constructed,like harsh mountainous areas and air space above the sea.So the airborne platform is expected to replace the ground station and provide flexible and relay links for the large-scale integrated communication network.However,the photon transmission rate would be randomly reduced,owing to the randomly distributed boundary layer that surrounds the surface of the aircraft when the flight speed is larger than0.3 Ma.Previous research of airborne QKD with boundary layer effects is mainly under the air-to-ground scenario in which the aircraft is a transmitter,while the satellite-to-aircraft scenario is rarely reported.In this article,we propose a performance evaluation scheme of satellite-to-aircraft QKD with boundary layer effects in which the aircraft is the receiver.With common experimental settings,the boundary layer would introduce a ~31 dB loss to the transmitted photons,decrease ~47% of the quantum communication time,and decrease ~51% of the secure key rate,which shows that the aero-optical effects caused by the boundary layer cannot be ignored.Our study can be performed in future airborne quantum communication designs.展开更多
文摘Education is a great cause to achieve national prosperity, national rejuvenation and people’s happiness, and an important way to block the intergenerational transmission of poverty. Rural revitalization, education first. Rural children’s education is an important issue of rural revitalization. This paper takes rural children, especially left behind children and children in distress as the help objects, and uses the advantages of “Internet plus” to improve the system, strengthen family education guidance, integrate social love resources, etc., to solve the problems faced by rural children, such as no guidance in learning, lack of guidance in behavior, lack of care in life, promote the overall healthy development of rural children, and solve the problem of rural education backwardness.
基金supported by the National Natural Science Foundation of China(Nos.61971436,61972410,and 61803382)the Natural Science Basic Research Plan in Shaanxi Province of China(No.2018020JQ6020)+1 种基金the Research Plan of National University of Defense Technology(Nos.ZK19-13 and 19-QNCXJ-107)the Postgraduate Scientific Research Innovation Project of Hunan Province(No.CX20200003)。
文摘Remarkable progress has been made in satellite-based quantum key distribution [QKD],which can effectively provide QKD service even at the intercontinental scale and construct an ultralong-distance global quantum network.But there are still some places where terrestrial fiber and ground stations cannot be constructed,like harsh mountainous areas and air space above the sea.So the airborne platform is expected to replace the ground station and provide flexible and relay links for the large-scale integrated communication network.However,the photon transmission rate would be randomly reduced,owing to the randomly distributed boundary layer that surrounds the surface of the aircraft when the flight speed is larger than0.3 Ma.Previous research of airborne QKD with boundary layer effects is mainly under the air-to-ground scenario in which the aircraft is a transmitter,while the satellite-to-aircraft scenario is rarely reported.In this article,we propose a performance evaluation scheme of satellite-to-aircraft QKD with boundary layer effects in which the aircraft is the receiver.With common experimental settings,the boundary layer would introduce a ~31 dB loss to the transmitted photons,decrease ~47% of the quantum communication time,and decrease ~51% of the secure key rate,which shows that the aero-optical effects caused by the boundary layer cannot be ignored.Our study can be performed in future airborne quantum communication designs.
