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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.Brazil will auction a foreign exchange credit line of up to $4 billion on December 12th.Morgan Stanley upgraded the rating of Shandong Gold H shares to over-allocation, with a target price of HK$ 22.20.

List of A-share share repurchase: 16 companies disclosed the progress of repurchase, and on December 12, a total of 16 companies issued announcements related to share repurchase. Among them, four companies disclosed the stock repurchase plan for the first time, two companies' repurchase plans were approved by the shareholders' meeting, four companies disclosed the implementation progress of stock repurchase, and six companies' repurchase plans have been implemented. Judging from the initial disclosure of the repurchase plan, the amount of a company's stock repurchase plan on that day exceeded 10 million. Nanshan aluminum, Longzhu Science and Technology and Longzhu Science and Technology have the highest repurchase plans, and they plan to repurchase no more than 600 million yuan, 5,895,100 yuan and 1,171,000 yuan respectively. Judging from the repurchase plan passed by the shareholders' meeting, the repurchase plans of two companies exceeded 10 million on that day. Huaan Securities and Tongkun have the highest repurchase amount, with the planned repurchase not exceeding 200 million yuan and 51,966,700 yuan respectively. Judging from the implementation progress of repurchase, Shunluo Electronics, Shengquan Group and Hailiang have the highest repurchase amounts, with 9.009 million yuan, 3.8251 million yuan and 3.5187 million yuan respectively. Judging from the completed repurchase, the repurchase amount of four companies on that day exceeded 10 million. Chengda Pharmaceutical Co., Ltd., Jinshi Resources Co., Ltd. and Yingfangwei Co., Ltd. have completed the highest repurchase amounts, with 57,061,600 yuan, 53,158,000 yuan and 31,405,600 yuan respectively.Sunac China's domestic debt restructuring has entered a critical stage. "Sunac China has a large number of domestic creditors and a complex structure. Within seven working days, two domestic debt restructurings were approved, reflecting the creditors' recognition of the plan. " People close to Sunac China said. "The biggest feature of Sunac China's restructuring plan is that creditors can choose a variety of restructuring methods, and creditors can choose the appropriate method according to their own capital characteristics." Liu Shui, director of enterprise research at the China Central Finger Research Institute, said that the scheme can reduce the debt scale, greatly extend the debt repayment period, help to repair the company's balance sheet and create conditions for the improvement of the company's operating fundamentals. It is understood that Sunac China is one of the first real estate enterprises in the industry to propose an overall solution to domestic debt. Before that, the industry had experienced a series of debt-conversion explorations such as debt extension, debt restructuring, reverse mixed reform and bankruptcy restructuring, among which debt extension was the first choice for most real estate enterprises to convert debt. (Securities Daily)Morgan Stanley upgraded Hongyuan Green Energy Co., Ltd. to parity.

The Jehad delegation will discuss the exchange of detainees with Israel. On the night of 11th local time, the Palestinian Islamic Jihad (Jehad) said that the delegation including its Secretary-General Zeyad Nahara had arrived in Cairo. The delegation will discuss the latest progress of the agreement on the exchange of detainees with Israel and the ways to provide assistance to the Gaza Strip.Seven people were killed in the attack on Rafah, a city in the southern Gaza. On the 12th local time, it was learned from the Palestinian side that Israeli troops bombed Rafah, a city in the southern Gaza, killing seven people and injuring many others. According to medical staff in Rafah, seven dead people were attacked while protecting a rescue truck that arrived in the city. (CCTV News)The United Nations General Assembly voted to pass two Gaza-related resolutions, and the United States and Israel voted against them again. On December 11th, local time, the 10th emergency special session of the United Nations General Assembly resumed. Before the end of the General Assembly, the General Assembly voted to adopt two resolutions, calling for a ceasefire in Gaza and the release of detainees, and supporting the activities of UNRWA. Among them, the resolution supporting the United Nations Relief and Works Agency for Palestine Refugees in the Near East in fulfilling its mandate received 159 votes in favor, 11 abstentions and 9 votes against. The resolution affirmed its full support for the Agency's mission and denounced the relevant Israeli legislation. The resolution calling for a ceasefire in Gaza received 158 votes in favour, 13 abstentions and 9 votes against. The resolution once again called on Gaza to cease fire and release the detainees, and emphasized the importance of accountability. The United States and Israel voted against both resolutions.