【Today's Cover】
During the rainy season in the valley, the temperature warms up and the rain is full. Over the past few days, peasants in various parts of Luocheng Mulao Autonomous County in Hechi City, Guangxi Province, have carried out field agricultural activities while grabbing the peasants, and have gone all out to do a good job in planting and planting early rice. Photo by Liao Guangfu
Message stations
Image source: Visual China
●On April 19, the International Organization for Standardization (ISO) issued the International Standard "Requirements and Recommendations for the Detection of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) by In Vitro Diagnostic Test System - Nucleic Acid Amplification Method" (ISO/TS 5798:2022) international standard. This standard was proposed by BGI Gene, China Institute of Standardization and other units organized by the State Administration of Market Regulation (Standards Committee) and jointly developed by global experts, and is the first international standard specifically for the detection of the new crown virus issued by ISO. (Source: Science and Technology Daily)
● According to the China Manned Space Engineering Office, at 5:02 Beijing time on April 20, the Tianzhou-3 cargo spacecraft separated from the space station Tianhe core module backward port, flew around to the forward port, and completed the automatic rendezvous and docking at 9:06. At present, the space station Tianhe core module and Tianzhou-3 combination are in good condition, and the follow-up will welcome the visit of the Tianzhou-4 cargo spacecraft, the Shenzhou 14 manned spacecraft and the Qingtian Experimental Module. (Source: Science and Technology Daily)
New discoveries
Art of the micronova explosion. Image source: Mark Garrick / Durham University, UK
Recently, an international cooperation team led by Dr. Simone Scullingi, an astronomer at Durham University in the United Kingdom, used the Very Large Telescope of the European Southern Observatory to observe and confirm a new type of stellar explosion with a strength of about one millionth of a nova explosion, tentatively named micronova. This new mechanism enriches and deepens the understanding of stellar explosions. (Source: Science and Technology Daily)
Pure technology
Schematic diagram of experimental apparatus and theoretical model: a. Degenerate optical resonator b. Synthetic photon orbital angular momentum lattice. Figure according to the paper
Recently, the team of academician Guo Guangcan of the University of Science and Technology of China has made important experimental progress in quantum simulation based on synthetic dimensions. The team bound photons carrying different orbital angular momentums to a degenerate optical resonator and artificially synthesized a one-dimensional topological lattice by introducing photon spin orbital coupling, creating a new method for topological quantum simulation. (Source: University of Science and Technology of China official website)
Design concept of ion distillation technology. Figure according to the paper
●Recently, the team of Professor Xu Tongwen of the University of Science and Technology of China originally proposed a concept of "ion distillation", and applied it to high magnesium lithium than salt lake lithium for the first time. The ion distillation technology greatly improves the separation efficiency between special materials, and the lithium products with ultra-battery-grade purity are produced by the salt lake brine step by step, which solves the technical problem of high magnesium lithium than salt lake brine. (Source: Science and Technology Daily)
An artistic diagram of a pair of top quarks produced within the LHC. The most typical signals are four jets (yellow), a muse (red line) – captured by the CMS muizi detector (red box), and disappearing energies (purple). Source: CERN official website
● According to the official website of CERN reported on the 19th, the compact muon coil cooperation group of the Large Hadron Collider (LHC) made the most accurate measurement of the mass of the top quark to date, and the error of the newly measured mass value did not exceed 0.22%. The researchers say that accurately understanding the mass of the top quark is critical for scientists to understand our universe on the smallest scale. (Source: Science and Technology Daily)
Da
Xiong Jiarui (right) poses with the instructor. Source: Chutian Metropolis Daily
●Recently, a main belt asteroid discovered by xiong Jiarui's group in the first affiliated middle school of Central China Normal University was confirmed by the International Astronomical Union Minor Planet Center and was awarded the international number: 2021 GB68. According to the regulations, Xiong Jiarui's team will have the naming rights of this asteroid. According to reports, Xiong Jiarui, who is in his third year of high school this year, is a member of the Astronomy and Earth Sciences Branch of the Student Academy of Sciences of the university, and has loved astronomy since he was a child, and has twice been selected for the astronomy Olympiad national training team. (Source: Chutian Metropolis Daily)
Look at the world
VillagersZawadi( right) and Caroline try to find corn in a withered maize field in Kilifi, Kenya, on March 23. Photo by Xinhua News Agency reporter Dong Jianghui
● The United Nations World Food Programme said on the 19th local time that due to insufficient precipitation and the stagnation of humanitarian assistance, the drought in Kenya, Somalia and Ethiopia in the Horn of Africa will further deteriorate, and it is expected that 20 million people will face a hunger crisis this year. Kenya, Somalia and Ethiopia are currently facing the worst droughts since 1981. (Source: China News Network)
Editor: Liu Yiyang
Review: Yue Liang
Final Judge: He Yi