First, the friction of physical common sense
When two objects are in contact with each other and are squeezed, when they are in relative motion or have a relative motion trend, they will produce a force on the contact surface that hinders the relative motion or the relative motion trend. This force is called friction (Ff or F).
Two, chemical knowledge of carbon dioxide transcritical direct ice making
Carbon dioxide under normal temperature and pressure is gaseous. After applying a certain pressure, it can be liquefied into liquid or even condensed into solid (that is, dry ice). After the pressure is reduced, liquid or solid carbon dioxide can be quickly vaporized (or sublimated) into gas and absorb a lot of heat, thus achieving the purpose of reducing the environmental temperature.
Third, graphene in cutting-edge technology
The lowest temperature in the Beijing Winter Olympics stadium can reach MINUS 30 degrees Celsius. In order to make the ceremony dress beautiful and warm, pieces of black material are specially added to the clothes. This is a graphene heating material developed by China Hangfa for this Winter Olympics, which can quickly heat up and help the staff resist the cold.
Fourth, the food delivery robot
When the food is ready, the athletes can call the robot to deliver the food, and the robot will deliver the prepared food to the room designated by the athletes. His companions include wine mixing robots, cleaning robots, welcoming robots, cooking robots, etc. They can not only complete the task perfectly, but also answer any questions you have intelligently.
Five, artificial intelligence referee
In order to improve the training efficiency and effect of aerial skills, an artificial intelligence referee and coach system was developed. The system has been applied to the daily training of a project since 20 19, providing multi-dimensional index analysis such as motion trajectory and body posture, and can point out the losing action in real time, providing professional judgment and guidance for coaches.