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Scientists observed semi-Dirac fermion for the first time, and scientists from Pennsylvania State University and Columbia University joined hands to observe a special kind of quasi-particle-semi-Dirac fermion for the first time. Such quasi-particles have mass when moving in one direction, but lose mass when moving in the other direction. The researchers said that in-depth research on these quasi-particles is expected to promote the development of next-generation batteries, sensors and other technologies. Related papers were published in the new issue of Physical Review X.Making it easier for the people to see a doctor, the construction of a close-knit county medical community has entered the fast lane. According to the news of the National Health and Wellness Commission, up to now, more than 2,100 counties and districts across the country have carried out the construction of a close-knit county medical community, which has achieved a comprehensive push by the province. County medical community refers to the county medical service system with county hospitals as the leader, township hospitals as the hub and village clinics as the foundation, and forms a service community, a responsibility community, a benefit community and a management community. Since the beginning of this year, China has accelerated the sinking of personnel-centered resources in county medical communities, implemented the sinking of service, technology and management at the same time, and carried out mobile medical treatment and mobile consultation. More than 90% of counties in the country have achieved full coverage of county-level hospital personnel stationed in township hospitals. All localities have accelerated the construction of resource sharing centers in counties such as medical imaging, medical examination and ECG diagnosis, and promoted grassroots inspection, superior diagnosis and mutual recognition of results, so that people can enjoy convenient and high-quality inspection and diagnosis services at the grassroots level. At present, the image center has covered more than 70% of township hospitals in China. (CCTV)Small Vegetable Garden International Hong Kong IPO seeks to raise HK$ 860 million. According to the announcement on the Hong Kong Stock Exchange, Small Vegetable Garden International issues 101 million shares at a price of HK$ 850 per share. According to calculation, the company will raise HK$ 860 million, and the stock is expected to be listed on December 20th, with Huatai International and UBS as co-sponsors.

 During the year, A-share companies threw out nearly 1,000 single and medium-term cash dividend plans. According to Wind statistics, as of December 11th, 940 listed companies have thrown out 994 single and medium-term cash dividend plans this year, with the number of them increasing by 269.41% year-on-year. The total amount of dividends involved was 667.519 billion yuan, a year-on-year increase of 166.24%. Among them, 791 orders have been implemented, and dividends have reached 360.768 billion yuan; 203 single pending implementation, the total amount of dividends to be paid is 306.751 billion yuan. (Securities Daily)During the year, A-share companies threw out nearly 1,000 single and medium-term cash dividend plans. According to Wind statistics, as of December 11th, 940 listed companies have thrown out 994 single and medium-term cash dividend plans this year, with the number of them increasing by 269.41% year-on-year. The total amount of dividends involved was 667.519 billion yuan, a year-on-year increase of 166.24%. Among them, 791 orders have been implemented, and dividends have reached 360.768 billion yuan; 203 single pending implementation, the total amount of dividends to be paid is 306.751 billion yuan. (Securities Daily)

The performance of deep thinking AI model exceeds the existing weather forecast. A study published in the new issue of Nature reported the latest machine learning model introduced by deep thinking. The model can make reliable probabilistic weather forecast according to current and future weather, and its performance not only exceeds the best traditional medium-range weather forecast, but also can better predict extreme weather, tropical cyclone route and wind energy production.Goldman Sachs upgraded Societe Generale to neutral. Chris Hallam, an analyst at Goldman Sachs, had a previous rating of sell. The target price is 29.25 euros, which is 9% higher.Australia announced the establishment of bass strait (the strait between the Australian mainland and Tasmania) offshore wind power area in Tasmania, southeast of Australia.