Tianzhou IV was successfully launched and docked with the space station; Chinese team has developed an aerial robot that can "think independently" | Global science news
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? Botany?
Motuo, Tibet discovers the tallest tree known to Chinese mainland
According to People's Daily, a research team led by Peking University (including Peking University, Xizijiang Ecological Conservation Center, Landscape Conservation Center and Beijing Digital Green soil Science and Technology Co., Ltd.) cooperated with the Forestry and grassland Bureau of Motuo County, Tibet. A 76.8-meter-high Budan pine was recorded in Green Village, back collapse Township, Motuo County, Tibet. It broke the previous record for the 72-meter king of Sequoia flousiana located in Gaoligong Mountain, Yunnan Province, and became the tallest tree found so far in the range of Chinese mainland.
In April 2022, the research team used the UAV lidar system to map Budanson on a large scale in Motuo. Adanson is a narrow distribution tree species only distributed in the eastern Himalayas. It was found that there were 11 pines with a potential of more than 70 meters. Subsequently, the research team carried the knapsack lidar into the hinterland of the forest and carefully mapped the 11 giant trees. After 10 days of on-the-spot investigation, data collection and processing work, a giant Bhutanese pine tree with a height of 76.8m was finally found, setting a new record for the tallest tree in Chinese mainland. The research team suggested that the tallest Budan pine tree be named "Xindabu", which means "divine tree" in the local Mamba language.
? Spaceflight?
Tianzhou IV was successfully launched and docked with the space station
According to the China manned Space Engineering Office, the long March 7 Yao 5 carrier rocket carrying the Tianzhou IV cargo spacecraft was ignited and launched from China's Wenchang Space launch site at 01:56 Beijing time today, with complete success. About seven hours later, Tianzhou-4 successfully docked the space station sky and core module back ports at 08:54, using autonomous rapid rendezvous and docking mode. After the rendezvous and docking is completed, it will be transferred to the flight section of the assembly. This is the first launch mission of the Chinese space station from the key technology verification phase to the in-orbit construction phase, officially opening the curtain on the full construction of the Chinese space station.
Tianzhou IV cargo ship is a fully sealed cargo ship, which has the largest cargo transport capacity and the most comprehensive in-orbit support capacity in the world. During this mission, Tianzhou-4 loaded more than 200 pieces (sets) of cargo from astronaut systems, space station systems, space application fields, and cargo spacecraft systems, carrying about 750kg of supplementary propellant, and the total weight of uplink materials was about 6000 kg. It will provide material support for the Shenzhou 14 crew to stay in orbit for six months, assemble and build the space station, and carry out space applications such as material science, microgravity, and aerospace medical experiments.
This launch is the 420th launch of the long March series of carrier rockets. This year, China's manned space program will carry out five space missions, sending two manned spaceships, two space station experimental modules and one cargo spacecraft into space to complete the construction of China's space station in orbit. (CCTV News, Science and Technology Daily, China Aerospace Science and Technology Group Co., Ltd.)
? Robots?
Chinese team has developed an aerial robot that can "think independently".
Through satellite positioning and trajectory coding, robot groups can perform in formation in the air, and can achieve a variety of formations. But once they lose the control of the ground computer, they will not be able to maintain formation, or even hit obstacles and fall down. Therefore, how to make robots fly freely in groups in the air is a major technical bottleneck. Recently, a research team from the School of Control Science and Engineering of Zhejiang University and Huzhou Research Institute has solved a series of related core technologies and developed a robot that can fly in groups independently and controllably. The related paper was published in the form of a cover paper in the journal Science Robot.
This is a palm-sized robot with a depth camera, a height sensor and an airborne computer. The researchers also used an ingenious algorithm to enable them to avoid obstacles and achieve group flight. In addition, these drones do not need to rely on any external infrastructure, such as GPS, and can independently calculate and process large amounts of information encountered during flight. In testing the robots, the team asked them to take off in a bamboo forest, then walk freely through cluttered branches and bushes, and independently determine the best flight path. Compared with the previous testing methods-in an obstacle-free development environment or specially designed obstacles, this is the first time to successfully realize the flight test of robot groups in a complex and uncontrolled environment in the field.
? Environment?
The content of helium in the atmosphere is rising
Helium-4 (? He) exists mainly in natural gases or radioactive ores in nature. He is released during the extraction and combustion of fossil fuels, although it does not increase Greenhouse Effect, but measuring its content may be used as an indirect indicator of fossil fuel use. In a new study published in Nature Geoscience, scientists have detected rising levels of helium in the atmosphere.
?
Because nitrogen levels in the atmosphere are constant, the researchers compared He and nitrogen levels. The results show that He/N? The proportion increases, which means that the accumulation rate of He in the atmosphere is gradually increasing. In addition, the scientists also measured the content of helium-3 (3He) isotopes in the atmosphere, which can be used in applications such as nuclear fusion and cryogenic superfluids. the results show that the proportion of 3He/?He does not seem to change, indicating that the 3He isotope is rising at a rate comparable to that of He.
? Environment?
A large amount of liquid water was found under the Antarctic ice sheet for the first time
The ice sheet of Antarctica is never motionless. The surface of the ice sheet is cold, but the bottom is usually relatively warm due to geothermal action. When the ice melts at the bottom, water acts as a lubricant, causing the ice sheet to flow quickly. Those fast-moving parts of the ice sheet are called ice flows. Scientists have previously known that there are shallow flowing water systems under the ice to promote the movement of ice, but they have always suspected that that is not the whole story. Now, in a study published in the journal Science, scientists have discovered a large water system under the Antarctic ice sheet for the first time.
?
The team investigated the Whelance Ice flow (Whillans Ice Stream), which is 96.6km wide, which is one of six ice flows to the Russian ice shelf. Scientists use magnetotelluric imaging technology to detect subglacial sediments and make maps based on the data. The data show that there is a layer of sediment more than a kilometer thick, filled with glacier fresh water and sea water, and the deeper the water is, the more salty it is. This is the first time that a large amount of liquid water has been found in subglacial sediments, which is more than an order of magnitude larger than the previously known ice launching system. Groundwater may be important for controlling the flow of ice flows, and the discovery of large water systems will also help people better understand the impact of climate change on sea levels. More future research may tell people how fast ice can flow from the continent into the ocean and cause sea levels to rise, the researchers said.
? Paleontology?
The way the ceratosaurus changed its teeth
Triceratops (a ceratosaurus), which lived in the late Cretaceous, is famous for its peculiar shape, with up to m
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