February 19, 2018, the fourth day of the Lunar New Year. Chongqing is also permeated with the festive and lively atmosphere of the Spring Festival.

　　A young policeman hurried to the funeral home and made three deep bows to the body in the coffin.

　　The people he paid homage to were not his relatives or friends, nor his close friends.

　　My name is Wang Zemin, and Uncle Yang is my savior. I came here to see him for the last time today.　

　　I will be you when I grow up.

　　A newspaper witnessed the mission of two generations of policemen.

　　Wang Zemin, 23, is an ordinary policeman in Chongqing.

　　One day in the winter of 2017, at 12 o’clock in the middle of the night, he was on duty and suddenly received an alarm call from a man. His child was lost.

　　After three hours of intense searching, Wang Zemin finally found the figure of a child carrying a yellow schoolbag, and finally let go of his heart after a night’s struggle and breathed a sigh of relief.

　　On second thought, he thought how familiar the scene was.

　　Twenty years ago, 3-year-old Wang Zemin was separated from his father in a department store, and he was so scared that he cried.

　　Two strange men who claimed to be his father tried to take him away. Fortunately, I met Yang Xuefeng, a 21-year-old policeman who just started working. Yang Xuefeng hugged him and searched the whole department store, and finally found his father who was sweating and anxious.

　　This scene happened to be photographed by reporters passing by and published in Chongqing Evening News the next day.

　　Coincidentally, 20 years later, Wang Zemin also became a policeman.

　　He imagined that if we met again, he would give the newspaper of that year to Uncle Yang and tell him that now we are two generations of policemen, and that’s exactly what I said. When I grow up, I will become you.

　　But he didn’t expect to see this uncle Yang again, and it was already a long time between heaven and man.

　　Wang Zemin took the newspaper in those days and came to Yang Xuefeng’s Lingqian. He must give Yang Xuefeng a present. Because of uncle Yang Xuefeng’s kindness to him, but also because of a young policeman’s sincere respect for his predecessors.

　　Yang Xuefeng was an ordinary traffic policeman, who was the deputy head of the Shichuan patrol brigade of the traffic patrol detachment of Yubei Branch of Chongqing Public Security Bureau.

　　On the third day of February 18th, 2018, Yang Xuefeng, who was responsible for Spring Festival travel rush security, was attacked by a mob with a knife.

　　In order to prevent more bloody casualties, Yang Xuefeng, who was stabbed several times, grabbed the gangster desperately and tried his best to knock out the knife in his hand.

　　The gangster was subdued, but Yang Xuefeng was stabbed in the carotid artery and stabbed several times in the abdomen, and died heroically because of excessive blood loss.

　　If it weren’t for Yang Xuefeng’s fate to subdue gangsters, he might still be one of the most common traffic policemen on the streets of Chongqing.

　　Every day, when people follow his gesture to guide through the traffic, they don’t know his name or remember his face. His face is integrated into the group image of thousands of public security policemen.

　　However, many people will always remember his name.

　　The "warm police" in the mouth of ordinary people

　　The rule of law is supreme, human feelings are more human.

　　Villager Tang Xingkui is a volunteer of popularizing law. It is hot in summer in Chongqing, and many people who ride motorcycles to work in the village don’t love helmets. Tang Xingkui saw who didn’t wear it on the road and went forward to correct them.

　　There was a young man named Li who blamed Tang Xingkui for meddling and being prude, which made Tang Xingkui angry. However, he unexpectedly thought of Yang Xuefeng. "When I think of officer Yang, if he encounters this thing, he will definitely not get angry at all. After that, Tang Xingkui still encountered a correction once. After several times, I finally got rid of the young man’s habit of not loving helmets.

　　But in fact, Tang Xingkui himself was given a ticket.

　　In October, 2017, he drove out on business, and was stopped by Yang Xuefeng, a traffic policeman who was in the jurisdiction for routine inspection, because his car had not been inspected for seven years. When he heard that he was going to be punished, Tang Xingkui was emotional and shouted that he was in a hurry to do things, and he had to pay a fine and punish him quickly.

　　Yang Xuefeng didn’t get angry. He patiently informed Tang Xingkui of the consequences of failing to conduct annual inspection of vehicles, gave him a warning and punishment according to regulations, and left his phone number. As soon as Tang Xingkui heard that he didn’t have to be fined, he drove away with luck. Unexpectedly, three days later, Tang Xingkui received a strange phone call. "I was the traffic police that day. Did you go to the annual inspection?" Tang Xingkui was moved by the policeman’s concern, and after that, he also gave birth to extra gratitude to the traffic police.

　　From then on, every time I met Yang Xuefeng on the road, he would roll down the window to say hello.

　　Soon after, he volunteered to become a volunteer for popularizing the law. Whenever he saw the villagers breaking the rules, he hurried to persuade them. Sometimes when the villagers have a bad attitude, he thinks about the attitude of police officer Yang in law enforcement and is calm.

　　Now, whenever he passes the intersection of Shichuan Town, he always looks out unconsciously, recalling the appearance of Yang Xuefeng standing guard on duty there.

　　"Stand up, stand up and throw caution to the wind"

　　When my colleague Huang Changfu took out his mobile phone and wanted to call Yang Xuefeng, he remembered that he was gone.

　　For Huang Changfu, Yang Xuefeng is the kind of person who can "stand up, stand up and get out" in times of crisis.

　　He clearly remembers that at noon in the summer of 2017, he and Yang Xuefeng had just returned to the brigade after handling a traffic accident, and they had not had a sip of water. Suddenly, they heard someone shouting that there was a fire outside, and a taxi spontaneously ignited.

　　Hearing this, the Yang Xuefeng turned and rushed out, grabbed the fire extinguisher in the corridor and ran out. As he ran, he shouted, "Brothers, hurry up".

　　At this time, the taxi is filled with black smoke, which has ignited an open flame and may explode at any time. Huang Changfu couldn’t help shouting: "Yang Xuefeng, danger!" But Yang Xuefeng turned a deaf ear, and rushed to the front end to get a fire extinguisher and sprayed it hard at the flame.

　　After more than twenty minutes, the fire was put out, and Yang Xuefeng’s hair was burnt, and his face and hands were covered with blisters.

　　Huang Changfu squeezed a few handfuls of sweat for him, but Yang Xuefeng said, "Time is so urgent, where can I want so much? What if there are people in the car?"

　　Stick to the front line for 21 years

　　Stand as the most familiar figure of passers-by

　　Yang Xuefeng’s mother still remembers that 21 years ago, when Yang Xuefeng graduated from the police academy, she stubbornly chose to work in the front line. His mother was almost crying, but Yang Xuefeng refused to change her wish.

　　His father is a soldier, and he has been exposed since he was a child. Yang Xuefeng also has a police dream.

　　In 1997, he graduated from Yang Xuefeng University. Since then, he has worked as a traffic policeman for 21 years. Ten years of them were on duty on the road. Yang Xuefeng has changed jobs six times, from Chongqing’s congested downtown to muddy villages and towns. The Stone Boat Patrol Brigade, where he was in his lifetime, is one of the most remote units in Yubei Branch, with an area of 324 square kilometers. Each policeman is responsible for nearly 120 kilometers of traffic management tasks every day. The working environment is more and more difficult, and the work difficulty he faces is constantly encountering new challenges. Faced with the hard work that ordinary people can’t imagine, Yang Xuefeng never complained, always took root in the front line, and devoted himself to keeping the people safe.

　　The street vendor said, I don’t know his name, but I am familiar with him. I can see him there at six or seven o’clock every morning.

　　His mother once secretly went to see her son standing guard. In the hot summer in Chongqing, she saw her son standing in the middle of the road sweating, and her heart ached.

　　She bought a bottle of water, asked a passer-by to deliver it to her son, and then left quietly.

　　After Xuefeng’s death, she arranged her son’s belongings and found a piece of paper by accident. She picked it up and suddenly remembered that it was a poem from Yang Xuefeng’s favorite blue bloods.

　　　At that time, he asked his mother to copy it word by word.

　　And this poem already contains the son’s lifelong ambition.

Maybe one day.

When happy people look back on the years in Cang Sang.

The rings of the Republic’s growth

I have already drowned your tired face.

Sweat, blood, tears and even sacrifice

All the memories about you

Are dissipated in the passage of time.

Even on the monument engraved with glory

And I didn’t leave a word about you

You just went?

As if disappearing at the end of the time tunnel

Silent and forever.

And I, only I, deeply understand.

That used to shine on your glory.

Still the same as the day

That once remembered your ideal.

Still surging in my veins

You are the flag that I will never fail.

I am your endless expectation.

You know, and I know.

Our common name is loyalty.

Loyalty is our eternal blood.

— — Our common name

　Say goodbye and send the hero on a long journey!

Tonight at 20:05

CCTV-1 "Time Model Publishing Hall"

Let’s witness together

"Warm Police" Yang Xuefeng was posthumously awarded

Title of "model of the times"

　　CCTV News:Henan recently suffered from extremely heavy rainfall, and the National Defense General launched a flood control level II emergency response at 3 o’clock on the 21st. Continuous heavy rainfall has caused many roads and subways in Henan to be flooded and people trapped. Firefighters around the country heard of the "flood" and rushed to Henan. Today (July 21st) afternoon, a press conference on flood control in Henan Province was held to introduce the latest situation of flood control and rescue.

　　Heavy rains in Henan have caused 25 deaths and 7 lost contact.

　　According to incomplete statistics, since the 16th, this round of heavy rainfall has caused 1,240,737 people in 560 townships in 89 counties (cities, districts) in the province to be affected, 25 people were killed and 7 people were lost.

　　Large-scale merchants in Zhengzhou are well stocked, and these supermarkets are operating normally at present.

　　At the press conference held by the Information Office of Henan Provincial Government, Wu Fumin, deputy mayor of Zhengzhou Municipal Government, said in response to a reporter’s question that up to now, 7 of the 14 stores in Yonghui Supermarket are operating normally. Four of the seven stores in Dennis Department Store are operating normally, and 260 of the 360 stores in Dennis Convenience Store are operating normally; Of the 26 stores in Dennis Supermarket, 21 are operating normally. Seven of the 11 stores in Daha Supermarket are operating normally. Eleven of the 14 stores in 711 convenience store are operating normally, and supermarket stores such as Lotus, RT Mart, Beijing Hualian and Century Lianhua are all operating normally. At present, the commercial and trade circulation enterprises in Zhengzhou are all stable at full price, and the enterprises that are not operating normally are fully restoring their business status.

The 5th International Auto Show in Handan in 2024, spanning the Millennium, meets again at this moment.

From April 4th to 7th, 2024, we met again at Yongnian Fastener Expo Center.

A grand event of automobile culture spanning a thousand years, a price competition among a hundred schools of thought. In 2024, during the Qingming small holiday, the Fifth International Auto Show in Handan will be attended by mainstream automobile brands at home and abroad, with an exhibition area of nearly 30,000 square meters, 100 exhibitors and thousands of new cars. At the previous Handan International Auto Show, all kinds of newly released and listed models and top luxury cars appeared together. According to industry insiders, even if you don’t buy a car for the time being, just take a look, you can compare all the cars you are interested in in in the shortest time to prepare for the next car purchase. "This is what Handan International Auto Show really makes people feel the charm of one-stop car purchase and car appreciation."

Not only that, there will be various performances, interactive activities and various gifts waiting for you. Considering that it is inconvenient for you to travel because of the long distance, we also have a free shuttle bus in your area. The location of the bus is as follows:

Bus parking place: Melody City, New Century Center, Fuxing Trade City.

Bus parking time: April 4-6 at 8: 30 am and 2: 00 pm.

Bus return time: April 4-6 at 11: 00 am and 4: 30 pm.

Take the free car ferry to collect gifts: a bag of rice and a bucket of laundry detergent.

Scan code and group registration for free car ferry.

Xú Zhēng Yu Hewei improvised "Robbery"

Last Saturday, the fifth issue of Zhejiang Satellite TV OPPO "I am an actor" continued to "speak" with acting skills. That night, Zhang Ziyi, Cecilia Han and Landy Li staged a tearful drama "Daughter", with superb acting skills and realistic themes to recreate film and television classics; Actors Wang Maolei, Yang Di, Baby Zhang, Cao Bingkun, Jiang Mengjie, Steven Zhang, Hailu, Sunny, and Li Nian enjoyed their performances in Night Shop, The Last Emperor, and My First Half of Life, which not only aroused enthusiastic comments from netizens, but also made the audience see the "opportunities" provided by the program for the new generation of actors and the performance happiness brought to good actors.

Go to Blueberry Video to watch the latest full video of I am an Actor > >

Zhang Ziyi’s ultimate interpretation of the hot search of the screen, Zhihu detonated the topic boom and reappeared the explosive physique

In this issue, the ratings of "I am an Actor" easily won the first place in the same period. That night, Zhang Ziyi, Cecilia Han and Landy Li jointly challenged the realistic theme work Daughter, which won unanimous praise from netizens, and Zhang Ziyi’s extreme deduction of counting money in the film was praised as the second place on the hot search list. With the praise of netizens, keywords such as # Wang Fengzan Zhang Ziyi’s acting skills # and # I am the daughter of actor Zhang Ziyi # have also been frequently searched. In addition, # Yu Hewei exploded the lamp for Steven Zhang # and # Jiang Mengjie lines # also rushed to the top ten of the hot search list.

In addition to "fancy screen" on the hot search list of Weibo with nearly ten keywords, this issue # I am an actor # once again landed in the top three of the hot search list of Zhihu variety, and the in-depth comments and analysis truly reflected the high expectations of professional film critics and performance enthusiasts for the program. As of today, the main topic of the program # I am an actor # The reading volume has exceeded 1.9 billion, and the video playback volume of the whole network has exceeded 750 million. The eye-catching data strength highlights the "acting" charm of the phenomenon variety.

"I am an Actor" provides "opportunities" for the new generation and brings performance happiness to good actors.

In order for young actors to gain faster growth in this pure performance platform, Yu Hewei gave the only explosive light benefit to the new generation of young actor Steven Zhang. After the broadcast of the program, netizens were so excited that they called Yu Hewei, who had a discerning eye, and called him "powder is on the teacher" in the discussion of # Yu Hewei bursting the lamp for Steven Zhang #, while the Douban Goose Group encouraged Steven Zhang, who was promoted, "I hope he can make persistent efforts".

In addition, Sunny’s and lianli’s evenly matched acting skills also became the focus of hot comments that night. Many netizens said with tangled feelings that "Sunny has a strong sense of acting substitution, but lianli is full of emotions, so it is really difficult to vote". In the program, the two people’s true feelings about why they came to "I am an actor" are even more infectious. At the scene, Sunny said that she was very happy to stand on the stage, while Li Nian, who had lost self-confidence, firmly said, "I am an actor and I want to be myself", which attracted netizens to sigh "I feel distressed and admire the two actresses".

This week, "I am an Actor" will bring more wonderful performances to the audience. Who can participate in the film and television work "Cao Cao on the Bus" produced by Chen Chong? What kind of performance sparks will Kara Wai collide with the actors after Golden Horse? Please pay attention to Zhejiang Satellite TV OPPO "I am an Actor" at 20:15 this Saturday (October 13th), and Tencent video will be broadcast exclusively on the night of the program.

Shangrao, Yangguang. com, March 21 news (Reporter Deng Yuling) The years have passed, and the fragrance has been born, and the change of the morning and evening has reached the vernal equinox. On the morning of March 20th, 2024, the "Beautiful Shangrao Free from Landscape" Shangrao Spring Rhyme Poetry and Painting Tour Huatian Concert kicked off in Jiangling Scenic Area of Wuyuan County, the most beautiful village in China.

Golden fragrance is everywhere, and Qian Shan is intoxicated by spring scenery. This activity landed in Jiangling Scenic Area, one of the "Four Flower Seas in China", and was divided into "Shangrao Spring Rhyme Welcome to Spring Tour, Wing Chun Tour and Bite Spring Tour" around the "Beautiful Shangrao Free Landscape" Shangrao Spring Rhyme Poetry and Painting Tour. We will create a new hot spot in Shangrao’s cultural tourism market in spring by enjoying 10,000 mu of flowers, experiencing the flower field concert in an immersive way, participating in the traditional spring custom "biting spring" and other activities, as well as the online live broadcast and offline promotion of talents at home and abroad, presenting the beautiful Shangrao’s Jiangnan spring to the on-site tourists and netizens, and playing the prelude of spring to build a world tourist destination.

Spring Festival Tour Promotes Spring Route

Blue sky, white clouds and flower fields beautifully outline the beautiful and romantic fairy tale world. During the Spring Festival Tour of Shangrao Chunyun, Shangrao Tourism Promotion Officer introduced the theme of Shangrao’s spring tourism, and released five spring boutique routes of "Shangrao Chunyun Poetry and Painting Tour" in 2024. Wuyuan promoted the tourism theme of "There is a kind of spring called Wuyuan"; Counties (cities, districts) and Sanqingshan in the city have simultaneously launched more than 30 spring tourist routes with unique county characteristics, such as Sanqingshan mountain rhododendron tour route, the most beautiful rural flower viewing tour and the tortoise line. These routes meet the travel needs of different tourists from the perspectives of flower viewing, outing, camping and food, and will invite global tourists to enjoy the spring rhyme of beautiful Shangrao poems and paintings through the promotion platform at home and abroad.

Singing the Music of Flowers in the Journey of Wing Chun

Flower sea is the stage, music is the medium, and the concert in Huatian is hot. Songs such as "Rape Flowers Bloom", "I’ll wait for you in spring", "Spring Flowers Bloom" and "Sunny Day" resounded through the fields. Listen to the elegant and distant guqin performance, and watch the cheongsam show with ancient charm. The beautiful scenery with beautiful women is very eye-catching. There are also wonderful performances such as drum sets and dances.

Layers of rape flowers swayed with the wind, cheerful and melodious songs floated, and the audience was happy and intoxicated. As a well-known tourist sketch creation destination in China, in the sea of flowers, painters and art lovers from all over the country recorded this intoxicating moment with colorful brushes.

The cheerful singing at the scene infected every visitor, and the 5-year-old girl from Tianjin smiled and danced with the music, as cheerful as an elf. Xiaoxiao’s mother said happily, "Shangrao Wuyuan is a travel destination that I have been longing for for for many years." This time, I specially brought my daughter to realize my dream. Today’s activity is very lively, and my daughter is also very excited, and she also danced a little! "

The trip of biting spring awakens the taste buds of spring

The spring breeze is ten miles, the flowers are overflowing, and there is a vibrant atmosphere everywhere. While enjoying the concert, tourists can also experience the traditional culture of interesting spring in the spring biting area.

At the Yaochun Food Shop, you can taste Wuyuan spring cakes, spring rolls, radishes and other special snacks and seasonal delicacies, and fly paper kites in the sea of beautiful flowers in spring, praying for a beautiful encounter. Stroll around the spring shop to enjoy the lively atmosphere of spring and experience the journey of biting spring with audio-visual and taste buds. In the early spring, online celebrity Daren promoted Shangrao’s preferential spring tourism policies, fine spring tourism routes and special tourism commodities in the live broadcast room, and invited us to sell spring together in Shangrao.

"I have never seen such a beautiful spring with so many rape blossoms." Lena, a talented person from Ukraine, and her two friends introduced to her hometown fans through the lens: "Wuyuan in spring is as beautiful as oil painting! I love Shangrao, I love Wuyuan, the people here are very enthusiastic, the food here is delicious, I like it very much, I hope you can come and walk into the most beautiful spring in China with me! "

The event also invited Shangrao Fire Brigade to carry out fire knowledge popularization and advocate civilized tourism and safe travel. Through aerial live broadcast, knowledge explanation and other forms, we will show Shangrao’s quality tourism services in a diversified way.

During the event, the new media topic activities initiated by Shangrao Wenguang New Tourism Bureau were launched simultaneously. During the period from March 20th to May 18th this year, any video related to Shangrao Spring Cultural Tourism will be released, and the topic # I have a date with Shangrao Spring # will be added, followed and @ Shangrao Wenlv will participate in the activities to win the grand prize and traffic support.

Spring is a gift, and flowers are a letter. On this gentle spring day, meet Shangrao, unlock the journey of spring rhyme poetry and painting, share the high-quality development achievements of cultural tourism, and enjoy the rural revitalization and beautiful pictures.

　　Xinhua News Agency, Guiyang, July 3 rd Title: Revealing the world’s largest "pot cover": 4,450 reflection units spell out the world’s largest and strongest "Eye of the Sky"

　　Xinhua news agency reporter

　　Remember what the "pot cover antenna" looks like?

　　On July 3, 2016, the world’s largest "pot cover" with a diameter of 500 meters was erected in Guizhou karst tiankeng.

　　It is the 500-meter spherical radio telescope, the largest and most powerful single-aperture radio telescope in the world.

　　It is called "Eye of the Sky", which is used to listen to the sounds in the depths of the universe and observe the mysteries of the universe.

　　Start with Xue Huadian on old TV.

　　When the old TV can’t receive the signal, the screen is not blank, but Xue Huadian is flashing. In fact, these Xue Huadian are electromagnetic wave signals, including radio emission from space.

　　In 1933, scientists in bell laboratory accidentally discovered the stable radio emission from the center of the Milky Way with a highly sensitive receiver, which opened the door to radio astronomy.

　　Anyone who has used the "lid antenna" knows that the larger the lid aperture, the clearer the TV picture. For radio telescopes, the larger the aperture, the farther you can see. Radio astronomers all over the world are pursuing to build a larger-caliber "pot cover" to improve the sensitivity of radio telescopes.

　　Peng bo, a researcher at the National Astronomical Observatory of the Chinese Academy of Sciences and deputy manager of the 500-meter spherical radio telescope project, said that the radio telescope had been short of funds at the beginning of its design and construction, but scientists were unwilling to reduce its caliber no matter what it was reduced.

　　"Space is mixed with all kinds of radiation, and distant signals are like cicadas in thunder, and there is no super-sensitive ‘ Ear ’ I can’t tell it at all. " Nan Rendong, chief scientist and chief engineer of the 500-meter spherical radio telescope project at the National Astronomical Observatory of the Chinese Academy of Sciences, said.

　　Previously, the most sensitive radio telescopes in the world were the 100-meter telescope in Bonn, Germany and the 300-meter telescope in Arecibo, USA. The former can move and "shake its head", while the latter is built with the help of karst potholes on Puerto Rico island.

　　At the 1993 International Radio Union Congress, astronomers from 10 countries, including China, proposed to build a new generation of radio "big telescopes", eager to go back to the original universe and solve many difficult problems in astronomy before the radio wave environment was completely destroyed.

　　"Building the world’s first large-caliber radio telescope is the dream of teacher Nan Rendong and several predecessors, which embodies the ambitious ambition of China astronomers." Peng bo said.

　　At the end of 1995, more than 20 universities and research institutes in the United Nations of Beijing Observatory set up the China Promotion Committee of Radio "Large Telescope", and put forward the karst engineering concept of building a spherical reflector, namely "Arecibo antenna array", by using Guizhou karst depression.

　　Since then, scientists in China have further promoted the concept of karst and proposed to independently develop a new karst unit, namely a 500-meter spherical radio telescope.

　　In order to set up a new generation of radio "big telescopes", scientists have turned over the karst mountain areas in Guizhou through satellite remote sensing. Peng bo recalled that at that time, the Observatory commissioned two institutes to conduct independent search and select from more than 300 candidate potholes. As a result, Dawodang, located in Pingtang County, Qiannan Prefecture, got the highest score twice.

　　The conditions provided by natural karst potholes in Guizhou have always been the most unique and the largest and strongest foundation for China Radio Telescope in the world.

　　Not just a big circle — — What is the strength of China Radio Telescope?

　　Whether you are near a large radio telescope, climbing the observation deck on a nearby hill or watching a virtual reality video, you can intuitively feel its first feature — — Big. Scientists describe it as a "giant eye for watching the sky".

　　Wang Qiming, chief engineer of the 500-meter spherical radio telescope project at the National Astronomical Observatory of Chinese Academy of Sciences, said that more than 10,000 tons of steel were used only for the ring beam, cable net and six towers supporting the feed cabin.

　　"The total reflecting surface of the telescope is 250,000 square meters, which is equivalent to the size of 30 standard football fields. Although the reflective panel is only 1 mm thick, it also uses more than 2,000 tons of aluminum alloy. " Wang Qiming said.

　　However, the large radio telescope is by no means a "stupid" metal pile, it is the most sophisticated astronomical instrument. Due to the adoption of the feed platform with optical, mechanical and electrical integration and the secondary adjustment of the parallel robot in the feed cabin, it can realize millimeter-level pointing tracking without rigid connection between the feed and the reflecting surface, ensuring accurate gathering and monitoring of weak radio signals in the universe.

　　The construction technology of the large radio telescope is also improving. Wang Qiming said that due to strict requirements, this big scientific project has promoted the improvement of equipment manufacturing capabilities in many fields:

　　— — The cable net with active reflection surface has the characteristics of high elasticity, tensile resistance and fatigue resistance, and its ultra-high stress amplitude of 500 MPa is 2.5 times that of the national standard;

　　— — More than 2,000 hydraulic actuators that help the reflector to be displaced can achieve accurate positioning and coordinated movement through expansion and contraction, and can also report their own state information to the control system to meet the movement requirements such as timely tracking and source change.

　　— — Dynamic optical cable, which undertakes the mission of transmitting all kinds of data and information, can withstand repeated bending, winding and torsion and other mechanical properties and harsh natural environment tests.

　　"Our original design concept originated from the Arecibo telescope in the United States. But compared with Arecibo, the active reflector system is our biggest innovation. " Peng bo said that the cable net structure of a large radio telescope can change with the movement of celestial bodies, driving 4,450 reflecting units on the cable net to form a 300-meter instantaneous paraboloid in the direction of radio power supply, which greatly improves the observation efficiency.

　　Arecibo telescope is a fixed telescope, which can only scan a 20-degree strip area in the sky by changing the position of antenna collapse. The active reflector allows the China Radio Telescope to have a wider observation range, covering 40-degree zenith angle.

　　The working frequency of large radio telescopes is relatively wide. Peng bo said that the feed cabin is equipped with a multi-band and multi-beam feed and receiver system covering the frequency of 70 MHz ~ 3 GHz.

　　Zheng Xiaonian, deputy director of the National Astronomical Observatory of the Chinese Academy of Sciences, said that the German Bonn telescope with a diameter of 100 meters was once called "the largest machine on the ground", and the sensitivity of the China Radio Telescope was improved by about 10 times. The 300-meter-caliber Arecibo telescope in the United States has been unsurpassed for more than 50 years. Compared with it, the comprehensive performance of China Radio Telescope has been improved by about 10 times.

　　Take root in the karst sinkhole and look at the deep space of the universe

　　"Like other radio telescopes, the two main scientific goals of the China Radio Telescope are to patrol the neutral hydrogen in the universe and observe pulsars. The former is to study the large-scale physics of the universe to explore the origin and evolution of the universe, and the latter is to study the material structure and physical laws in extreme States." Zheng Xiaonian said.

　　The earth’s atmosphere leaves two windows for human beings to explore the universe, one is optics and the other is radio. For astronomers, if the optical telescope is a microscope, then the radio telescope is a CT machine, which can obtain the ultra-fine structure of celestial bodies.

　　"There are seven sets of receivers, because the frequency of observation in different bands is different, and the observation and research goals are different." Peng bo said that in the eyes of large radio telescopes, the universe and cosmic celestial bodies are a three-dimensional presentation.

　　For more than half a century, the energy collected by all radio telescopes in the world has not turned a page, and the joining of China Radio Telescope will greatly accelerate this speed. And the energy collected means the amount of information to interpret the mysteries in the depths of the universe.

　　"Since the birth of the radio telescope, humans have discovered about 2,500 pulsars. If the working hours of the China Radio Telescope are all used to observe pulsars, it is expected to double this number within one year." Peng bo said that pulsars can be used for pulsar navigation, pulsar timing array and other application targets.

　　Nan Rendong believes that large radio telescopes may also find some unprecedented pulsar phenomena, such as a pulsar paired with a black hole, which may produce a breakthrough theory.

　　Every little progress in the development of physics is accompanied by great difficulties and twists and turns. But at every stage of human civilization progress, physics has always stood at the forefront of liberating productive forces. Peng bo said that scientists used Arecibo telescope to discover gravitational waves and won the Nobel Prize in physics, while China Radio Telescope provided a great opportunity for natural science, especially physics-related fields.

　　"The answer is yes to whether the large radio telescope that the public is very concerned about can be used to find extraterrestrial civilization." Peng bo said that it is a weapon to detect exoplanets, especially terrestrial planets. Because of its improved sensitivity, it can see farther and fainter celestial bodies. By detecting interstellar molecules and searching for possible interstellar communication signals, the probability of finding extraterrestrial civilization is 5 to 10 times higher than that of existing equipment.

　　On July 3rd, after the installation of the feed cabin and the reflector panel was completed as planned, the large radio telescope will be debugged for more than two months, and it will be officially completed and put into use at the end of September. However, in order to optimize all functional parameters, it needs to be continuously debugged and improved in two or three years of observation.

　　"After the completion of the large radio telescope, it will become the ‘ Sharp weapon ’ To maintain the status of world-class equipment in the next 10 to 20 years. " Zheng Xiaonian said, "I hope that China scientists will use it to produce results as soon as possible." (Note holder Qi Jian; Participating reporters Wu Jingjing, Hu Xing and Yang Weihan)