Objective To explore the status of confidential unit exclusion(CUE) status among voluntary blood donors in Hefei, so as to provide scientific basis for blood safety.Methods From 2012 to 2021, 57 out of the 1 158 272 voluntary blood donors in Anhui Blood Center, who requested CUE, were analyzed for population characteristics and their motives in ask

Since the beginning of the 1980s, ethnic tourism has been one of the key industries promoted by the government of Guizhou province in Southwestern China.This industry has brought tremendous changes to the communities of local 2003 toyota corolla exhaust system ethnic peoples in destination areas, especially in improving their economic life.However,

Massive device-to-device communication nodes and Internet of Things (IoT) devices are expected to be crucial components in next-generation wireless networks.However, the energy constraint of these nodes presents a challenge since the energy of the batteries is limited.Motivated by this, radio frequency energy harvesting (EH) has been developed as a

With the change of epoch, the standard of male attractiveness is also changing.Analyzing the trend of facial features changes over time in different environments can reveal the influence of social development on facial attractiveness.In this citroen c4 grand picasso boot liner paper, we propose a method to analyze the trend of facial features of Ch