[Today's Cover]
As the temperature picks up, Hangzhou Xixi National Wetland Park ushers in the annual " Xixi Flower Festival". Flowers such as azalea, peony, lily, , jade flowers, cherry blossoms bloom one after another, with beautiful spring scenery. The picture shows a ship taken by a drone on April 1 driving on the Xixi Wetland Waterway. (Photo by Weng Xinyang, Xinhua News Agency)
New discovery
●In early scientific investigations, scientists have discovered that there is water on the surface of Mars, and there are signs that the amount of water is very abundant, and it can even support and nurture life, but there has always been controversy about where this water comes from. A new paper published in Nature Earth Sciences says water molecules on Mars may have two different sources. Researchers said that by comparing the isotope components, it was found that the Martian crust and mantle have different proportions of hydrogen molecular isotopes, which means that the source of Martian crust and mantle may be different, which is very different from the Earth and may bring variables to the ultimate dream of humans such as immigration to Mars.
A rare ozone hole appeared over the Arctic . Image source: NASA Ozone Watch
● Recently, a huge ozone layer void appeared over the Arctic region, which is probably the largest void ever seen in the region, comparable to the ozone layer void that forms in Antarctica every year. According to Nature, ozone levels in most parts of the central Arctic (covered about 3 times that of Greenland) hit record lows. This ozone hole that may break in the next few weeks will not threaten human health, but as an extraordinary atmospheric phenomenon, it will be recorded in history.
Pure Technology
●Chang'e 4 lander and " Yutu 2 " lunar rover successfully completed the 16th lunar day scientific exploration work, completing the lunar night setting at 17:30 and 8:25 on March 31, respectively, entering the 16th lunar night dormant period. During this lunar day, the lander was in normal condition, energy balance, the payload lunar neutron and radiation dose detector and low-frequency radio spectrum instrument were turned on as planned, and the ground received scientific detection data was normal. Supercritical elasticity of
NiCoFeGa single crystal fiber: a) Comparison of traditional superelastic and supercritical elasticity; b) Austenite (004) diffraction peak change during loading and unloading of traditional superelastic and supercritical elasticity; c) Supercritical elasticity in wide temperature domain; d) Cyclic stability test curve of supercritical elasticity at the highest strain of 10%; e) High-temperature annealing of supercritical elastic alloys in [110] high-angle annular dark field image with a shaft, high temperature After annealing, the atomic scale entangled state grows into a clearly visible L21 and w structure (Photo source: Materials National Maintenance)
● Beijing University of Science and Technology National Key Laboratory of New Metal Materials and Beijing Materials Genetic Engineering High-precision Innovation Center Professor Wang Yandong's team successfully prepared NiCoFeGa single crystal fiber with zero hysteresis ultra-high elastic strain in a wide temperature domain. The fiber diameter is 30-500 microns and the length can reach more than 1 meter. The alloy fiber has zero hysteresis elastic deformation at room temperature up to 15.2%, with a maximum superelastic stress of 1.5 GPa. Its superelastic performance does not change with temperature in the 123-423K temperature range. In addition, the material has excellent cycle stability and high elastic storage under high strain (10%), and has broad application prospects in the advanced industrial fields of aerospace and intelligent manufacturing.
Message Station
Picture source: Xinhuanet (photo taken by Xinhua News Agency reporter Li Ga)
●Around 11:45 on April 1, the Z201 passenger train successfully passed through the derailment accident section of the Beijing-Guangzhou Railway Chenzhou section. It is reported that this train departs from Beijing to Sanya. It is the first passenger train passing through the accident section after the derailment accident. On March 30, when the T179 train passed through the Yonghua Village section of Gaotingsi Town, Yongxing County, Chenzhou City, Hunan Province, it hit a landslide nearby and interrupted its driving due to a nearby landslide.
Photo source: @People's Daily
●As of 13:25 on April 1, Sichuan Xichang City Jingjiu Township forest fire Lushan frontal open flames were all extinguished. On the afternoon of March 30, a forest fire broke out in Xichang, Liangshan Prefecture, Sichuan, endangering the city.As of the 31st, the overfire area reached more than 1,000 hectares. Due to the continuous increase in temperature and increasing wind, many ignition points in Lushan rekindled. Multiple forces quickly gathered to launch a general attack on the entire fire. Up to now, the three open fires in the front of Lushan, Daying Farm and Madao Deep Gully have all been extinguished.
Look at the world
●On March 31, local time, the Italian flag after half a flag was lowered beside the second century monument of Victor Emmanuel in Rome, Italy. According to AFP on March 31, Italy lowered the flag and held a national silence for one minute to mourn the deceased during the COVID-19 epidemic.
●On March 31, local time, medical staff sent a patient with COVID-19 to the French Air Force Medical Airbus A330-Phenix aircraft. It is reported that in order to alleviate medical pressure, France sent military aircraft to transport patients with COVID-19, which is part of the Morphee operation to evacuate patients with COVID-19 in the Greater Este region to areas currently affected by the epidemic.
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