IT＇S seven o＇clock in the morning, and Zhai Yuhong, 56, is on her beat in downtown Beijing. The feisty traffic coordinator takes her work seriously at the Zhanlanlu crossroad, doing her utmost to keep the movement o...IT＇S seven o＇clock in the morning, and Zhai Yuhong, 56, is on her beat in downtown Beijing. The feisty traffic coordinator takes her work seriously at the Zhanlanlu crossroad, doing her utmost to keep the movement of vehicles flowing smoothly, Zhai has been busy keeping order on the streets since she was retrenched from her state-owned factory job more than 10 years ago. As an early retiree she took up her position assisting the police with traffic control as a means to keep active.展开更多
IN June,Abdul Ati al-Obeidi,Muammar Gaddafi’s foreign minister,issued a statement that his leader is prepared to hold free elections.The conditions attached to the statement are that the UN cancels the no-fly zone,an...IN June,Abdul Ati al-Obeidi,Muammar Gaddafi’s foreign minister,issued a statement that his leader is prepared to hold free elections.The conditions attached to the statement are that the UN cancels the no-fly zone,and diplomatic and material support is withdrawn from the rebel National Transitional Council(NTC).If this happens Gaddafi is prepared to begin negotiations with the NTC that would lead to free elections within six months. Saif al-Islam,Gaddafi’s son went further,saying the European Union,the African Union(AU),the United Nations展开更多
Are your sleep rhythms out of whack from working the night shift? Does jet lag make you tired and grumpy? Maybe you just need to lighten up. Precisely timed doses of bright light, it turns out, can rapidly reset the b...Are your sleep rhythms out of whack from working the night shift? Does jet lag make you tired and grumpy? Maybe you just need to lighten up. Precisely timed doses of bright light, it turns out, can rapidly reset the body’s internal "clock" to match a new schedule. The artificial light can shift展开更多
The contradiction between the high number of visually handicapped people and the scarcity of guide dogs has stimulated the demand for electronic guide dogs(EGDs).Here,we demonstrate an EGD by leveraging piezoresistors...The contradiction between the high number of visually handicapped people and the scarcity of guide dogs has stimulated the demand for electronic guide dogs(EGDs).Here,we demonstrate an EGD by leveraging piezoresistors on a MoS_(2)/Ge heterostructure for simultaneous pressure-sensing and optical-sensing functions.The device has excellent gating capability and exhibits large positive and negative photoresponses under visible(532 nm,182 A/W)and infrared(1550 nm,37 A/W)illumination.These characteristics allow the device to efficiently classify different obstacles at all times of day using pressure and light signals.The device reaches nearly 100%accuracy after 48 training sessions when used to classify frequent scenes.The device adopts passive and active detection modes during the day and night,respectively,which improves the battery life of the EGD.This work provides a significant reference for the future design of EGDs,which may help a greater number of visually impaired people by reducing the cost of such devices.展开更多
文摘IT＇S seven o＇clock in the morning, and Zhai Yuhong, 56, is on her beat in downtown Beijing. The feisty traffic coordinator takes her work seriously at the Zhanlanlu crossroad, doing her utmost to keep the movement of vehicles flowing smoothly, Zhai has been busy keeping order on the streets since she was retrenched from her state-owned factory job more than 10 years ago. As an early retiree she took up her position assisting the police with traffic control as a means to keep active.
文摘IN June,Abdul Ati al-Obeidi,Muammar Gaddafi’s foreign minister,issued a statement that his leader is prepared to hold free elections.The conditions attached to the statement are that the UN cancels the no-fly zone,and diplomatic and material support is withdrawn from the rebel National Transitional Council(NTC).If this happens Gaddafi is prepared to begin negotiations with the NTC that would lead to free elections within six months. Saif al-Islam,Gaddafi’s son went further,saying the European Union,the African Union(AU),the United Nations
文摘Are your sleep rhythms out of whack from working the night shift? Does jet lag make you tired and grumpy? Maybe you just need to lighten up. Precisely timed doses of bright light, it turns out, can rapidly reset the body’s internal "clock" to match a new schedule. The artificial light can shift
基金supported by the National Natural Science Basic Research Program of Shaanxi(No.2022JQ-650)the Natural Science Foundation of China(NSFC)(No.62204188)the Cooperation Program of XDU-Chongqing IC Innovation Research Institute(No.CQIRI-CXYHT-2022-13)。
文摘The contradiction between the high number of visually handicapped people and the scarcity of guide dogs has stimulated the demand for electronic guide dogs(EGDs).Here,we demonstrate an EGD by leveraging piezoresistors on a MoS_(2)/Ge heterostructure for simultaneous pressure-sensing and optical-sensing functions.The device has excellent gating capability and exhibits large positive and negative photoresponses under visible(532 nm,182 A/W)and infrared(1550 nm,37 A/W)illumination.These characteristics allow the device to efficiently classify different obstacles at all times of day using pressure and light signals.The device reaches nearly 100%accuracy after 48 training sessions when used to classify frequent scenes.The device adopts passive and active detection modes during the day and night,respectively,which improves the battery life of the EGD.This work provides a significant reference for the future design of EGDs,which may help a greater number of visually impaired people by reducing the cost of such devices.
