1、 The Origin of Ancient Medals In ancient times, the prototype of medals mainly appeared in sports and military fields. At the Olympic Games in ancient Greece, the winner was awarded a wreath woven from olive branches, which can be seen as a form of early medals. It represents honor and excellence, and is a high recognition of athletes‘ competitive abilities. In ancient wars, brave warriors were also awarded special symbols or items in recognition of their heroic performance, which also had a certain medal like nature....

The development process of trophies has gone through a long evolution, mainly including the following stages: Ancient Origin Stage: China: The earliest physical trophy in China can be traced back to the "Zhabo Gui" in the early Western Zhou Dynasty. According to the inscription on the Zhabo Gui, King Zhao of Zhou held an archery competition in the capital city of Haojing. Zhabo hit the most bullseye and was rewarded with ten pieces of red copper and two musical instruments by King Zhao of Zhou. Zhabo used these copper materials to make a precious Gui for worshipping D...

January 8, the latest disclosure of the Ministry of Industry website shows that in order to strengthen the new energy vehicles, motor and rare earth permanent magnet materials and other industrial chain synergies, to promote joint research upstream and downstream enterprises, January 5, 2018, China Association of Automobile Manufacturers, China Rare Earth Industry Association organized a meeting on the cooperation mechanism of upstream and downstream of rare earth permanent magnet materials for drive motors of new energy vehicles in Beijing. Beiqi New Energy, Yutong Bus, Ge...

The production process of metal refrigerator magnets generally includes the following steps: 1. Design: Use computer-aided design (CAD) software or hand-drawing to design the pattern and shape of the refrigerator magnet. 2. Material selection: According to the design requirements, select suitable metal materials, such as zinc alloy, aluminum alloy, etc. Mold making: Use CNC machining or EDM technology to make the mold. 3. Die casting: Heat the metal material to liquid state, then inject it into the mold, and press the metal material into shape through the pressure of the die ...

Recently, the National Development and Reform Commission jointly issued with the National Energy Board, "on the promotion of biomass heat for the development of guidance", "opinions" clearly the biomass heat as an important measure to deal with air pollution and accelerate the biomass heat in the region Civil heating and small and medium-sized industrial park heating in the application of building a distributed green low-carbon clean and environmentally friendly heating system....

Compared with the traditional methods of communication, quantum communication with ultra-high security has become a major direction for the development of communications in the future. Quantum communications, which were often reported previously, are based on the principle of entanglement. What we are going to introduce today is a stranger form - Anti-Fictitious Communication: There is no quantum communication between two recipients for the quantum communication. The effect of not sending the quantum state of the particle transmission is also called the quantum Zeno effect....

E-waste should not be unfamiliar to the residents living in cities. Outdated old phones, obsolete computers, worn out old-fashioned TVs or fans, cell phone chargers, radios, MP3s, etc. ... When these things are used or used bad, how to deal with both convenient and environmentally friendly, it also Has become a problem that plagued many citizens....

According to a report by Russian satellite network on May 5, a new report released by Arctic Council Arctic Monitoring and Evaluation Plan (AMAP) Working Group said that the Arctic is rapidly melting and may be completely ice-free by 2040. In the meantime, a study by the University of Leeds in the United Kingdom found that in Antarctica, ice melts at a rate of about one-third of its expected value....

Automotive industry analysts believe that the development of China‘s electric car market, mainly for two reasons. One is the expansion of the surplus population in the Chinese population who want to drive luxury electric vehicles such as Tesla because they are more durable, powerful and good-looking....