标签归档 西安品茶网

Air China flight CA1524 flew normally today after the clear sky turbulence, and the model was changed to Boeing 747.

  Air China flight CA1524 flew normally today (July 11th) after the clear sky turbulence, but the aircraft type changed.

  The Paper reporter learned from Fei Changzhun platform that on July 11th, Air China flight CA1524 will still fly normally, and it is scheduled to take off from Shanghai Hongqiao Airport at 14: 45, and it is expected to land at Beijing Capital International Airport at 16: 36, with Boeing 747-89L.

  Fei Changzhun flight status of CA1524 on July 11th. Fei Chang Zhun screenshot

  On July 11th, Air China flight CA1524 was operated by Boeing 747-89L. Fei Chang Zhun screenshot

  On July 11th, China International Airlines issued a notice in its official Weibo: On July 10th, 2023, Air China flight CA1524 (Shanghai-Beijing), model A330-300, was suddenly bumped by the clear sky during the flight, and the crew and crew handled it according to the procedures, making every effort to safeguard the safety of passengers, and one passenger and one flight attendant were injured in the process. The flight landed normally at 17: 18, and Air China arranged a special person to accompany the injured passengers and flight attendants to the hospital for treatment.

  Air China official micro-release notice Weibo screenshot

  On the 11th, the band @SummerVapour Summer Solstice Dream released Weibo, saying that he was on flight CA1524 at that time, and he personally experienced the thrilling scene of the plane bumping. According to its profile in Weibo, SummerVapour Summer Solstice Dream Band consists of three people.

  At noon on the 12th, Weibo replied to the The Paper reporter that the passengers were blinded at first when the plane was bumpy, and only after the plane was stable did everyone slow down and start looking for things, and young people helped the elderly with mobility difficulties. "Thanks to Air China flight CA1524, the professional crew, and the passengers who abide by the regulations, everyone was surprised and had an unforgettable flight."

  In addition, Weibo also shared some warm-hearted clips at the time of the incident. After the turbulence, the crew broadcast for medical practitioners. The fans of star @ Kid-Lil Ghost had medical qualification certificates, and stood up first to help the injured passengers. When landing, @ Boxing World Li Jingliang soothed the passengers around and took everyone to applaud the crew. After landing smoothly, the musicians of various bands on the plane got up and squatted to help some people with mobility difficulties find lost mobile phone headphones and other items.

  This incident has caused many netizens to pay attention to the word "clear sky bumps".

  According to @ Central Meteorological Observatory, clear-sky turbulence usually occurs on sunny days, which is caused by clear-sky turbulence. Turbulence is caused by the irregular flow of the atmosphere. When encountering turbulence, the plane will bump rapidly, and in severe cases, the plane may temporarily lose control. Because it is not accompanied by obvious weather phenomena, it is difficult to observe and detect, which poses a great threat to flight safety.

  According to the Beijing Evening News, in June, 2017, China Eastern Airlines flight MU774 from Paris to Kunming, China, also had a clear sky bump, causing dozens of passengers on board to be injured to varying degrees. At that time, Wu Mingxiang, a senior captain of Shenzhen Airlines, said: "We can only make a comprehensive analysis of the forecast through the high-altitude weather map before taking off, but the accuracy is low. In fact, flying to an area that may be bumpy is not necessarily bumpy, and it is also related to the flight altitude, so ‘ The clear sky is bumpy ’ It is not easy to predict. It is recommended that passengers fasten their seat belts when sitting in their seats. After all, the flight situation is complicated. Planes are different from cars, and the impact force before and after is not as big as that up and down, so wearing a seat belt can prevent people from flying and being injured. Generally speaking, people who are injured by bumps in the air are not wearing a seat belt. "

  According to a recent report by Xinhua News Agency, a British study shows that in recent decades, the probability of aircraft encountering clear sky bumps during flight is increasing, which is inseparable from global warming under climate change.

  Chen Jianguo, a senior pilot, told The Paper that there is no need to panic excessively in the event of bumps. Remember that keeping your seat belt fastened on the plane is the safest preventive measure, regardless of whether the seat belt indicator is on or not.

On March 3rd, the 11th World Wildlife Day entered the Wildlife Park.

This article was transferred from tianshan net;
March 3rd, 2024 is the 11th World Wildlife Day. Xiao Bian of tianshan net Popular Science Studio walked into Karamay and visited Karamay, a "wildlife paradise" in early spring through the lens.

01:32
Karamaili, located in the east of Junggar Basin, is the native place of wild wild horse Platts, the largest wild habitat and breeding ground in the world. In addition to the rare wild horses of Platts, which are rarer than giant pandas, there are also rare and endangered wild animals such as Mongolian wild donkey, goose throat antelope, argali, lynx, red fox and sand fox, which is a concentrated distribution area of ungulate wild animals in low-altitude desert in China. It has many types of desert vegetation, such as Haloxylon ammodendron and Calligonum mongolicum, and is a typical representative of desert ecosystem in temperate arid regions of the world. There is also a unique natural landscape of clastic rock landform represented by Yadan landform in arid areas.
It is understood that there are 392 species of wild plants and 260 species of wild animals in Karamay.

05:41
In April, 2022, the application for the creation of Kalamaili National Park was approved. The creation area consists of three protected areas: Kalamaili Mountain ungulate wildlife nature reserve, Qitai Silicified Wood-Dinosaur National Geopark in Xinjiang and Qitai Silicified Wood desert park in Xinjiang.
Today, Karamay has been upgraded from the traditional "human eye view" to the "celestial eye view", and it has achieved "global patrol and adjustment at any time" from "local patrol". Heavy-duty pan/tilt, infrared camera, unmanned aerial vehicle and satellite communication make it full of scientific and technological sense.
Planning: Ding Tao Yang Tao Ding Wen
Photography: Niu Tai
Text/clip: Ding Wen
Tianshan net popularization of science studio Aisen film
Joint production
Reporting/feedback

Today, beginning of autumn, this autumn, I wish you all the best.

The wind blows a leaf.
Everything has surprised autumn.
The breeze gently brushed the treetops.
The solar terms in beginning of autumn came quietly.
Data Map: The park is full of green shadows and flowers. Photo by Wang Jiaoni
"Make autumn ten days in advance"
The arrival of this solar term in beginning of autumn
Doesn’t mean the heat is over.
Often have to wait until the "summer" comes.
Is the basic farewell to summer
Beginning of autumn is the first solar term in autumn.
"Li" means "start"
A beautiful and moving autumn picture
Spread out slowly on the earth
Data Map: The picture shows the sky in Daxing ‘anling, Inner Mongolia in autumn. Photo by Li Ming
The summer heat slowly dissipated.
It’s a little cooler in the autumn wind
Crystal clear dew
Dotted with green leaves
Welcome the morning sunshine
Milk crow scattered jade screen empty.
A pillow is cool and a fan is cool.
Beginning of autumn will "chew the autumn" after that.
Some places are also called "biting autumn"
Eat a delicious watermelon.
Welcome the arrival of autumn.
Data map: The picture shows the "autumn" placed by the staff with watermelons. Photo by Chen Chao
It is easy to have a bad appetite in summer
Remember to "paste autumn fat"
Braised pork, hotpot …
Have a good meal.
Reward yourself for your diligence.
The weather is getting cooler after beginning of autumn.
A balanced diet is needed.
Eat less spicy and greasy food.
Eat more lotus seeds, tremella, etc.
Data Map: The picture shows the hot pot in Chongqing. Photo by Liu Xian
"Autumn begins with yin, so everything is harvested."
The prelude to the large-scale autumn harvest opened.
People are filled with joy.
Dry the harvested crops.
Autumn is a poetic season.
When the rice is ripe, the fruits are fragrant.
Once hard work and sweat.
Will be richly rewarded.
Data map: Colorful harvest results such as peppers and corn are placed on the drying rack under aerial photography. Liu Zhankun photo
Autumn is peaceful and quiet.
Clouds and clouds are clear and clear.
Just like life.
After experiencing all kinds of things in the world
Love life more maturely.
He Xiang Xiao wan Xia
Chrysanthemum gas enters the new autumn
Say goodbye to summer
Welcome the picturesque autumn
Data Map: The picture shows the beautiful scenery composed of snow-capped mountains, red leaves, meadows and pines. Photo by Wang Jiang
Beginning of autumn is coming
Willing to work hard for you
Meet all the beautiful things in autumn!
(Reporter Shangguan Yun)
Reporting/feedback
Everyone is searching.
May you harvest in autumn. Autumn is the season of harvest. May you harvest in autumn is the season of harvest. May you harvest in autumn. May you harvest your dream. Autumn is cool. Harvest is just the first sentence of harvesting in autumn.



issue

Xi le nian Hua 3KA

You also reap all the good things! !

2022-08-07

Hunan

report


answer

Brother Lao Du, Kunming, Yunnan

Forwarded

2022-08-07

Yunnan(Province)

report


answer

Yunbai Xiahou 7I

May all our good things come as scheduled!

2022-08-07

Jiangsu(Province)

report


answer

Mizhenxuan 94

Beginning of autumn is coming
Willing to work hard for you
Meet all the beautiful things in autumn!

2022-08-07

Henan(Province)

report


answer

Yi yi1236669Y

Illustrated with pictures and texts, they complement each other and are beautiful

2022-08-07

Sichuan(Province)

report


answer

Xingxinchang 078

May everything be beautiful in autumn!

2022-08-07

Guangdong

report


answer

Invincible old darling

A touch of autumn dispels fatigue and troubles, a touch of autumn embellishes life, and a little happiness resides in the heart. Beginning of autumn, I wish each of us feel comfortable and happy!

2022-08-07

Shanghai

report


answer

Flower and berry water giant nearly 00

In the harvest season, may the beautiful dream come true.

2022-08-07

Beijing

report


answer

Ancient poetry fragrance

How time flies! It’s beginning of autumn in a flash!
In the distant mountains, autumn clouds rise at first, and Ping Ye gradually turns yellow. The melon in the yard is ripe and the tea at hand is slightly cold.

Willing to work hard for you

Meet all the beautiful things in autumn!

2022-08-07

Guangxi

report


answer

AaaQa-65Ln68c

Return of overseas wanderers

2022-08-07

Shandong(Province)

report


answer

There is no more.

Seasonal fruits have been listed one after another, and the national fruit price has dropped slightly.

CCTV News:After long summer, the temperature in various places has risen, and it is the season when a large number of seasonal fruits such as cherries and watermelons are on the market. What about the recent fruit prices? Let’s look at the reporter’s investigation.

In Beijing Xinfadi Agricultural Products Wholesale Market, fruit merchants told reporters that after the May 1 holiday, a large number of watermelons were listed in Shandong, Jiangsu, Beijing and other places, and the prices went down. On May 9, the average price of watermelons in Xinfadi Market was 4.82 yuan per kilogram, which was 20% lower than that on April 29, and 33% lower than that on April 9, while the varieties with higher prices in the previous period also dropped significantly recently.

Ma Jing, a fruit merchant in Beijing Xinfadi Market:Cherry from Dalian, Liaoning, and cherry from Shandong are on the market in large quantities. Last month, it was a kilo in 60 yuan, and now it is a kilo in 40 yuan.

Xu Jingju, a fruit merchant in Beijing Xinfadi Market:(Originally) high prices are now declining, such as litchi, which started at more than 200 yuan a box, and now it has dropped to 70 yuan (a box).

The data shows that in April, the average wholesale price of six kinds of fruits monitored by the Ministry of Agriculture and Rural Affairs was 7.90 yuan per kilogram, up 0.3% from the previous month and 10.5% from the same period last year. After May, with the warmer weather, seasonal fresh fruits such as watermelons and melons in the south, cherries, strawberries and mulberries in North China and Central China entered the harvest period one after another, and the market supply and varieties of fruits increased.

Wang Yunjuan, chief fruit analyst of the agricultural product market early warning team of the Ministry of Agriculture and Rural Affairs:Since May, the national average wholesale price of fruits has declined slightly, mainly due to the large number of melons and other fruits listed, of which the weekly average price of watermelons has dropped by 6%, down by 25% year-on-year. It is expected that fruit prices will enter a seasonal decline channel in the later period.

Spring in Ma ‘an Village

Xinhua News Agency, Guangzhou, February 27th (Reporter Wang Ruiping) When the Sanhua plum beside the village road blooms a little bud, Ma ‘an Village is also ushered in spring with more than 30,000 mu of bamboo forests around it.
Ma ‘an Village, Pingtang Town, Xinyi City, Guangdong Province, located in the depths of Yunkai Mountain, is more than 800 meters above sea level and more than 1,000 meters above sea level. The mountains are high and the valleys are deep, and the land is barren. The villagers once used "nothing but steep slopes" to describe their remoteness and poverty.
"I have to walk on the dirt road hanging on the ridge for more than an hour every day when I go to school. I bring my own rice and leftovers. At noon, I use three bricks to build a stove to cook." Zhou Qinglian, born in 2002, recalled that her childhood journey to school was full of bitterness. Today, although her face looks immature, she has been working for almost two years after graduating from college and is a reserve cadre of Ma ‘an Village Committee.
Zhang Yujiao also chose to go back to the village for employment. In 2023, she graduated from Guangdong Ocean University majoring in economics and joined the Ma ‘an village tourism development and operation enterprise, becoming the "new generation" of local rural revitalization. "I used to study hard to get out of this mountain, but I didn’t expect to return to my hometown after graduation." Zhang Yujiao, dressed in fashionable clothes, wore Chinese hairpins and a horse-faced skirt, while receiving tourists, told reporters the story of employment at home.
It depends on the earth-shaking changes in Ma ‘an Village to attract college students to return to their hometowns for employment. In June, 2021, Yunmao Expressway was officially opened to traffic, which ended the history of no expressway passing through the eastern mountainous area of Xinyi City, narrowed the time and space distance between the mountainous area of western Guangdong and Guangdong-Hong Kong-Macao Greater Bay Area, and Ma ‘an Village also ushered in a new life.
The new look of Ma ‘an village (photo taken on February 12, drone photo). Xinhua News Agency reporter Wang Ruiping photo
More than 30,000 mu of bamboo forest around Ma ‘an Village is the biggest local feature. In August 2022, the rural revitalization project of "Ma ‘an Zhuhai" officially started construction. As an important node in the "Demonstration Zone of Rural Revitalization along Yunmao Expressway" carefully built by the local government, the project is jointly invested by the government and enterprises with a proportion of 250 million yuan, and the construction and management are not lower than the national 4A-level tourist attractions.
"The first exit of Yunmao Expressway in Xinyi is our Pingtang Town. We have the largest bamboo forest in western Guangdong, with alpine meadows, lakes, clouds and patches of virgin forests."
Xiao Yingbei, secretary of the Party branch of Ma ‘an Village, took the reporter across the rest pavilion hanging with "cooking tea around the stove" from the entrance of the renovated village Committee, along the asphalt road, through the hydrophilic platform with flowing water, climbed up the hotel and homestay in the middle of the mountain, and went around to Zhuhai Square in the middle of the village. As he walked, he introduced that Pingtang Town used to be the "leftover material" of Xinyi City, and Ma ‘an Village was the "leftover material" of Pingtang Town. Now the traffic is good.
The scene of Yunmao Expressway passing through Yunkai Mountain (photo taken on February 11th, photo of drone). Xinhua News Agency reporter Wang Ruiping photo
"Just after the Spring Festival, several friends from other places wanted to visit our village and asked me if there was a traffic jam." Yang Xiangwen is usually engaged in logistics and distribution work in Baiyun District of Guangzhou. After dinner with friends, he walked to Zhuhai Square. He took the reporter’s hand and said, "Now I am very proud to tell others about our village. There are many videos of our village on my mobile phone, which others envy!"
Tourists took a group photo in Ma ‘an Village (photo taken on February 12). Xinhua News Agency reporter Wang Ruiping photo
In the reception room of Ma ‘an Village Committee, the wall is a new panoramic photo of Ma ‘an Village. Xiao Yingbei broke his fingers and analyzed the situation of the scenic spot after it was opened to reporters. In 2022, the collective income of our village was only about 170,000 yuan, and it has increased to 963,000 yuan in 2023. "Ticket income, house rental, parking fees, operating share of hotels and homestays, plus homestays run by villagers, restaurants and canteens can all increase villagers’ income."
According to the planning of Ma ‘an Village, after the "Ma ‘an Zhuhai" scenic spot is opened normally this year, the per capita annual equity dividend of villagers can reach 2,000 yuan, providing 200 jobs, and more villagers will also find jobs at their doorsteps.
"In the past, the village was a winding mud road, but now it has expanded into a 5.5-meter two-way lane." Zhou Qinglian said that every time the hometown road is widened, the life of the villagers will become better.
Driving from the top of the mountain to Yunmao Expressway, the clouds spread over the bamboo sea from the valley, and countless bamboo shoots were buried in the soil at this time, calling for spring rain. When the spring thunder rings, these spring shoots will bring different spring to Ma ‘an village.
Reporting/feedback

[Network China Festival] Lantern Festival: Regaining the breath of life and waiting for the reunion of thousands of families.

  The stars and the moon are burning in the sky, and there are two yuanxiao on earth. Every year, it’s Lantern Festival again.

  Lantern Festival, also known as "Shangyuan Festival". In this festival, in addition to eating dumplings, enjoying lanterns and solve riddles on the lanterns, there are also countless literati who have left many poetic poems. These poems, or trigger the resonance of missing, or contain similar warmth, as well as countless inner attachments. These beautiful images hidden in ancient poems have amazed the time and the soul.

[Network China Festival] Lantern Festival: Regaining the breath of life and waiting for the reunion of thousands of families.

  Today, let’s walk in poetry and feel the Lantern Festival in poetry.

  Ouyang Xiu wrote in the Northern Song Dynasty: "On the Lantern Festival last year, the flower market was lit like a day. The moon rose above the willow tree, At dusk he had a tryst with me. The lantern festival on the fifteenth day of the first month of this year, the moonlight and the lights are still the same as last year. I didn’t see last year, and my tears wet my spring shirt sleeves. " Just a few crosses create a hazy, quiet, graceful and soft artistic conception, which makes people feel the charm of China’s traditional poems.

  "Jin Li Fang Yan, Lan Hongyan in his early years. The color is far away, and the light is far away. After the Chinese suspect that the stars are falling, the building is like a moon hanging. Don’t have a thousand gold smiles, come and reflect the nine branches. " Lu Zhaolin, one of the four outstanding figures in the early Tang Dynasty, wrote a poem "Watching Lights at Fifteen Nights", which made the colorful Lantern Festival lights unique and brought people into the enchanted fairyland.

  The poet Su Weidao wrote in the poem "The fifteenth night of the first month": "The fire tree and silver flowers are combined, and the star bridge is locked. The crowd surged, the dust float in the sky under the hoofs of the horses; Moonlight all over every corner, where people can see the moon overhead. Prostitutes are all ruined, and songs are all ruined. Jin Wu can’t help but stay up at night, and the jade leaks. " The poem describes the scene of lights scattered and crowds surging on the Lantern Festival night in Chang ‘an, and people still don’t want to leave at midnight. Read it carefully, and you will have a wonderful feeling of being in the capital of Datang and sleepwalking in the sea of people and lights.

[Network China Festival] Lantern Festival: Regaining the breath of life and waiting for the reunion of thousands of families.

  Yuan midnight snack, between the lights. "Find him thousands of baidu in the crowd. Suddenly looking back, the man was there, and the lights were dim. " Xin Qiji, a poet in the Southern Song Dynasty, is well-known for this word in "Qing Yu An Yuan Xi". In fact, in ancient times, Lantern Festival was also a romantic festival. Lantern Festival provides an opportunity for unmarried men and women to get to know each other, and it is also a good opportunity for young men and women to meet their lovers.

  In the Song Dynasty, the anonymous poet "Partridge Sky Shang Yuan" said: "At dusk, we welcome the auspicious to the Royal Return, and the palace flowers carry the brocade in piles. The whip sounded by the bridge in Tianjin, and the shadow was opened in front of Xuande Building. Play Shun music, enter the Yao Cup, and announce that the car will go to Tianjie immediately. The king likes to have fun with the people, and he comes with shock on all sides. " It describes the grand occasion of the Lantern Festival in the capital city of Song Huizong, where the emperor enjoyed the fun with the people, the officials and petty officials swarmed around, and the people flocked to it. Everyone wore all kinds of flowers on his head, and all the way, it was colorful and dazzling, as if it were a sea of flowers.

[Network China Festival] Lantern Festival: Regaining the breath of life and waiting for the reunion of thousands of families.

  Photo by Beijing Daily reporter Pan Zhiwang.

  Tang Bohu, a cynical and talented six-legged layman, also wrote a beautiful work "Yuanxiao". "A moon without lights is not entertaining, and a moon without lights is not spring. Towards everywhere spring comes as seen here with lady fair, Over bright moonlit night flashing lanterns set off the moon as pure silver. All over the street, Zhu Cui swims around the village girls, singing and competing with the social gods. If you don’t show your respect and smile, how can you get rid of this good time? " The Lantern Festival written by him is not only beautiful in artistic conception, but also lively and touching. The lights and the moon are shining, the songs are everywhere, and even the village girls wear red and green to travel. The scene is very spectacular and moving.

  The beauty of poetry lies in its rich flavor of the times and life. The romance of poetry lies in its engraving of human experience and customs changes. Therefore, it can cross the long river of time and let us regain the memory of culture. No matter how time and space change, Lantern Festival is still a spiritual symbol that we can’t give up, and people are still used to reunion in festivals.

  "At the Lantern Festival last year, the flower market lights were as bright as day. On the first night of this year, only the moon remains. " On this day, which should be a family reunion, too many people can’t do so because of the unexpected visitor "COVID-19 epidemic". This sudden epidemic has disrupted the rhythm of everyone’s reunion and disturbed our pace of going home. At this moment, on the Lantern Festival, let’s say a word to the "soldiers" who are fighting against the epidemic: take care and be safe! Say a word to all my family and compatriots: Happy holidays!

  The fight against the epidemic has entered the stage of Armageddon, and we look forward to the early dispersal of the epidemic and the family reunion as soon as possible! (Guangming. com reporter Yuan Qing)

There’s a reason for playing billiards too badly. The exclusive cheats teach you how to clear the table with one shot.

"Source: Institute of Physics, Chinese Academy of Sciences"
Whether table tennis is good or not depends on fate, and some people believe in "making great efforts to make miracles".
Some people think that through constant practice, they can naturally master those wonderful hitting angles and achieve perfection.
Do you know how hard I work?
But in fact, the way of hitting the ball and the trajectory of the table tennis game contain rich knowledge of mathematics and physics. This knowledge controls the trend of table tennis, and you can also become a master of table tennis by mastering these theoretical knowledge.
Essential knowledge 1: sine theorem
If we regard point A as a white ball, point B as a target ball and point C as a hole, how can we achieve the goal?
At this time, understanding the sine theorem can help you find the best goal plan. The formula of sine theorem is as follows:
In this formula, r is the radius of the circumscribed circle of the plane triangle ABC.
Essential knowledge 2: cosine theorem
Similarly, in any triangle in the above picture, the rational use of cosine theorem formula can also help you find the best scheme to hit the ball B into the hole C with the white ball A.
The cosine theorem is as follows:
Essential knowledge 3: reflection theorem
As shown in the above figure, red is the initial motion line of the ball, blue is the reflection line of the ball, the gray rectangle can be regarded as the edge library of the table, and the purple midline is the normal vector in the middle of the interface, so the following hypothetical figure can be obtained:
Through this reflection pattern hypothesis, we can better imagine the trajectory of the ball after hitting the library.
Essential knowledge 4: collision principle
① Frontal collision (completely elastic)
After the collision of two objects, the kinetic energy and momentum of the system are conserved, and there is no additional energy conversion.
The conclusion is:When the two balls have the same mass, the speed of the two balls will be exchanged after a completely elastic ideal frontal collision.
② frontal collision (totally inelastic)
Inelastic collision means that a part of the kinetic energy of objects is converted into internal energy before and after collision, while completely inelastic refers to converting kinetic energy into internal energy as much as possible, that is, two objects move at the same speed together.
③ Actual collision
The actual collision is a mixture of completely elastic and completely inelastic collision. If the velocity of the two balls is defined as V1,1, V2, 1 after a complete elastic collision; Before the collision, the speed of the two balls was V1,0, V2,0, and the recovery coefficient of the resin material used in billiards was k (the recovery coefficient of good materials was k≈1), so there were:
When k=0, it is completely inelastic collision, and when k=1, it is completely elastic collision. For an actual collision problem, the transformation of velocity and internal energy after two balls collide can be expressed by k, which is specifically expressed as:
In addition, it includes image vector decomposition; General situation and special situation of two-dimensional collision; Rigid body dynamics; Rotational inertia and rotational energy: rotational inertia of homogeneous sphere, law of rotation; Friction: a series of necessary knowledge points such as static friction, sliding friction and rolling friction …
Aiming technique
After a long and boring basic theoretical knowledge, you must be a patient and persevering table tennis enthusiast, and you also have the theoretical basis for learning more skills. Then if you want to master the secret of how to hit the ball in actual combat, aiming technology is the main content to be learned next.
I believe everyone understands a truth. When we observe an object, the closer it is to us, the bigger it will look. If it is farther away from us, it will look smaller. In fact, the actual size of the object has not changed. This is the so-called visual effect.
The visual effect will affect our judgment on the size of the cue ball, thus affecting our aiming angle.
So when we aim at close range, we will subjectively think that the ball looks big, while it looks small at a distance.
Then there are two problems that need to be discussed: first, the influence of the cue ball getting bigger on the thickness of the shot; Secondly, how much will the distance between the center of the cue ball and the goal point and the center of the target ball make the cue ball look bigger?
First of all, we will explain the impact of hitting thickness after the cue ball becomes bigger as shown in the above figure, which shows the maximum overlapping thickness of the two balls, the big gray circle is the size of the cue ball after it becomes bigger, the radius is, the small circle is the original size of the cue ball, the red ball is the size of the target ball, the radius is, and the maximum overlapping radius of the small gray circle and the red circle is, so there are:
The second question has the following explanation about the distance between the cue ball and each ball center. As shown in the above figure, D represents the distance between the cue ball and the goal point, and the distance D0 between the cue ball center and the target ball center, and the angles α and β, then the relationship between the variables can be obtained as follows:
Walking technique
Finally, let’s talk about the topic that everyone is most interested in, which is also the advanced skill of table tennis game-walking technique. Walking technology is to control the motion track of the cue ball by hitting different positions of the cue ball.
0:Center pole/fixed pole, ideally, the cue ball will only slide without any rotation.
1:High/heel/topspin, cue ball rotates forward, which has following effect after collision.
2:Low shot/shrinking shot/backspin ball, cue ball rotates backward and travels backward after collision.
3&4:Side plugs, 3 and 4 represent the left and right respectively, and the cue ball rotates to the right and left respectively after the shot, which can change the rebound angle of the cue ball after hitting the library.
5:Left plug, the effect is the superposition of high pole and left plug.
6:Upper right plug, the effect is the superposition of high pole and right plug.
7:Left lower plug, the effect is the superposition of low rod and left plug.
8:Lower right plug, the effect is the superposition of low rod and right plug.
A:Stearns followed, and the distance followed after the cue ball hit the target was shorter than that followed by the high pole.
C:Stern retreats, and the distance that the cue ball retreats after hitting the target is shorter than that of the low pole.
B&D:Stensey, the cue ball changes direction after hitting the target.
By hitting the above position of the cue ball, the corresponding cue ball movement effect can be achieved.
After learning so many high-end knowledge and formulas, let’s get rid of the old concept of "making great efforts to make miracles". Many people always keep the same strength to hit the ball, which is not desirable. The strength of hitting the ball should be changed at any time with different situations. This requires long-term practice to accurately grasp the strength of the shot that should be adopted at different angles.
The above is the explanation of the formula and technology related to this table tennis game. Dear table tennis lovers, remember the formula and practice hard. "Clear the table with one shot" is not a dream!
END
Audit: Zhu Guangsi, member of Beijing Popular Science Writers Association.
Reprinted content only represents the author’s point of view
Does not represent the position of Institute of Physics, Chinese Academy of Sciences.
Source:Tadpole staff
Editor: Garrett
Reporting/feedback

Let outsiders see jokes, no! Making this big country’s heavy weapon is to fight for making it in China.

  CCTV News:There are representative major projects and major projects in each era, and those super projects have become the symbolic symbols of the times, which embodies the hard work and creativity of the people of China and also witness the road of China’s revival and rise.

  Shield machine is a necessary equipment for tunneling, and it is also a high-end equipment focused on "Made in China 2025". At one time, the technology and overseas market of super-large diameter shield machine have been monopolized by western countries for more than a century. In May this year, the super-large diameter shield machine independently developed by China will go abroad for the first time and become a new "national business card" for China.

  In May, this super-large diameter shield machine with a diameter of 12.12 meters and a weight of 2,200 tons is about to leave for Bangladesh. Although it is the weekend, the manufacturing team is still making the final confirmation of the export shipment plan.

  For Zhang Boyang, the person in charge of this shield machine, it is not the first time that there is no weekend. The shield machine exported this time is not the most difficult project he took over. At the same location, they once manufactured the first super-large diameter shield machine with independent intellectual property rights in China — — "Tianhe", with a diameter of 15.03 meters and a weight of 6,500 tons, was used to excavate the Yangtze River tunnel in Nanjing at that time.

  Zhang Boyang, head of CCCC shield machine project: "This was the most difficult geology in the world at that time. It was soft on the top and hard on the bottom. If it was all hard, it would be easy and even."

  Zhang Boyang is the commander of Nanjing Yangtze River Tunnel Project. At that time, only one foreign company in the world had experience in manufacturing shield machines with similar conditions, and the construction party planned to order two shield machines from this company.

  Zhang Boyang, head of CCCC shield machine project: "700 million one, two 1.4 billion, no price reduction. You can’t rely on others to import all the time. Once they wean you from food, you will die, so we are determined to make it ourselves. "

  It’s better to throw off your arms and do it yourself than to cry your head off and beg for help. A big country’s heavy weapon must be in its own hands. As an engineer of this project, Zhou Jun was mainly responsible for research and development.

  Zhou Jun, Chief Engineer of CCCC Shield Machine Project: "The pressure is enormous. Everyone thinks it is incredible, and there are doubts outside."

  In the process of research and development, many technical problems appear for the first time, so we can only cross the river by feeling the stones. The research and development of core components has made everyone think hard.

  Zhou Jun, Chief Engineer of CCCC Shield Machine ProjectThe cylinder is the core component of the shield machine, and the shield machine moves forward by the thrust generated by the cylinder. Before that, they were all imported from abroad. Our super-large diameter shield cylinder is a luxury car, 500,000 yuan each. "

  Tianhe needs about 50 such cylinders. In order to realize the localization of core components, the R&D team made great efforts and made up their minds to gnaw this hard bone.

  Zhou Jun, Chief Engineer of CCCC Shield Machine ProjectWe employees are the earliest to get off work at 11 pm. I basically go to work after 7 o’clock in the morning and get off work around 1 o’clock, every day. Through four to five months of experiments, we have come up with a set of manufacturing inspection standards for large-diameter shield cylinders. "

  After nearly half a year of technical research, the domestic shield cylinder finally came out, and the cost of one cylinder was 300 thousand yuan cheaper than that of imported cylinders. A super-large diameter shield machine consists of tens of thousands of parts of different sizes. Behind every domestic part is hard work. The research and development of Tianhe has been designed, modified, tested and revised thousands of times. There are more than 7,000 drawings confirmed in the final design of the whole equipment, which are more than one person high when stacked together.

  Zhou Jun, Chief Engineer of CCCC Shield Machine Project: "Everyone thought the same thing as me at that time, that is, we built these two machines. At that time, China should be said to be the shield machine with the most advanced technology, the largest diameter and the highest difficulty. Everyone had this sense of accomplishment at that time, that is, this kind of glory for the country, this kind of courage, including this spirit, that is to say, since I have done this, I must do it well. "

  After 14 months of hard work, in July 2012, China’s first super-large diameter shield machine "Tianhe" was officially put into use, and the two shield machines saved nearly 800 million yuan for the country. However, can this shield stand the test of super engineering?

  Zhang Boyang, head of CCCC shield machine project: "The most painful thing was in 2013, when the cutter head got stuck. Just a few days before the Spring Festival, I didn’t leave the construction site for half a step, and I stayed in the shield machine for observation and analysis every day. "

  The cutter head suddenly stopped turning during the excavation of the Yangtze River tunnel, and these 59 days were the most difficult days for everyone.

  Zhang Boyang, head of CCCC shield machine project"This is not only an enterprise, but also the pressure from China people. You let foreigners see Chinese jokes. This pressure is really huge, even if you cut my meat. "

  After a long period of hard thinking, Zhang Boyang made a bold suggestion.

  Zhang Boyang, head of CCCC shield machine project: "I retreated the cutter head and shield body of this integral shield machine, which is technical and has never been seen before. But I also evaluate and analyze what risks it has, how to retreat, and how much strength it needs. I use the telescopic mechanism and oil cylinder of the cutter head, and every time I retreat 10 mm, 10 mm, that’s all. "

  After two months of persistence, the cutter head finally turned again. In July, 2015, after three years, Tianhe came out of the hole at the bottom of the river and saw the light again. Many people present cried with joy.

  Zhang Boyang, head of CCCC shield machine project: "Without responsibility, there is no innovative spirit. You dare not take responsibility, do you dare to innovate? We are not willing to do this. How can China’s manufacturing industry develop? "

  Tianhe has achieved 50% localization rate, and the localization rate of shield machines to be exported to Bangladesh has increased to 95%. It will be used in China’s largest overseas shield road tunnel project, and help the country’s "Belt and Road Initiative".

Yinhu welcomes blessings, saying that New Year’s Eve is a happy family.

New Year’s Eve is the last day at the end of the year, also known as New Year’s Eve, New Year’s Eve, New Year’s Eve, and New Year’s Eve. New Year’s Eve is a time to get rid of the old and get new, reunite with the family and offer sacrifices to ancestors. Tomb-Sweeping Day, July 30 and Double Ninth Festival are traditional festivals to offer sacrifices to ancestors in China. It is connected with the beginning and end of the new year, which is called "the end of the poor month and the end of the new year". It is the eve of the new year and an important time junction to get rid of the old and welcome the new year. Because New Year’s Eve often falls on the 29th or 30th day of the twelfth lunar month, it is also called New Year’s Eve. "One night is even two years old, and five hours is divided into two years." On New Year’s Eve, the old year ends here, and the next year will be replaced by a new year. Sticking Spring Festival couplets, observing the New Year’s Eve, and lucky money … all these customs can’t be less!

year

draw

spring

unite

paste

rise

come

Spring Festival couplets are also called door-to-door couplets, spring stickers, couplets, couplets, etc. They depict the background of the times and express good wishes with neat, dual, concise and exquisite words, which is a unique literary form in China. Sticking Spring Festival couplets comes from ancient peach symbols. Every spring festival, every household should select a pair of red Spring Festival couplets and stick them on the door to add festive atmosphere to the festival.

red

red

fire

fire

hang

light

cage

The lanterns in China, also known as lanterns, originated in the Western Han Dynasty more than 1,800 years ago. Every year before and after the New Year’s Eve, people hang red lanterns symbolizing reunion to create a festive atmosphere. On New Year’s Eve, red lanterns are hung at the door, the hall is burning with flaming fire, candles or oil lamps are lit, and the family talks around the table.

that

happy

melt

melt

year

night

meal

On New Year’s Eve, eating New Year’s Eve is the most lively and enjoyable time for every household in the Spring Festival. The sumptuous New Year’s dishes are filled with a table, and the family is reunited, sitting around the table and having a reunion dinner. There are big dishes, cold pots, stir-fry and snacks on the table, and the hot pot is boiling and steaming, which indicates that the coming year is booming; "Fish" and "Yu" are homophonic, which not only symbolizes "auspicious and festive", but also implies "annual surplus"; Radish, commonly known as vegetable head, wishes a good head; Frying food wishes the family a prosperous life, such as "cooking oil with fire". Northerners are used to eating jiaozi on New Year’s Eve, which means "making friends at a younger age". And because the white-flour jiaozi is shaped like a silver ingot, a pot of pots on the table symbolizes the meaning of "making a fortune in the New Year, and the ingot rolls in".

joyous

joyous

happy

happy

press

year

money

Lucky money is given by the elders to the younger generation. After eating the New Year’s Eve dinner, everyone is not allowed to leave at the table. When everyone has finished eating, the elders will give it to the younger generation and encourage their children and grandchildren to learn and improve in the new year. Because "old" and "precious" are homophonic, the elders hope that the lucky money can exorcise evil spirits and avoid disasters, and bless the healthy growth of children. "Lucky money" first appeared in the Han Dynasty, and it is a wearable coin-shaped ornament. During the Republic of China, the lucky money became the "welfare money" given by the elders to the younger generation.

explode

a kind of bamboo

sound

sound

welcome

new

spring

There is a saying among the Han people in China that when the new year comes, the first thing for every household to open the door is to set off firecrackers, so as to get rid of the old and welcome the new with the sound of firecrackers. Firecrackers are a specialty of China, also known as "firecrackers", "firecrackers" and "firecrackers", which have a long history of more than 2,000 years. Setting off firecrackers can create a festive and lively atmosphere, which is a kind of entertainment in festivals and can bring happiness and good luck to people. Today, the concept of "Green Spring Festival" is deeply rooted in people’s hearts, and traditional firecrackers have also been replaced by colored lights, lanterns, electronic firecrackers and other products. As the Spring Festival approaches, the flavor of the year is stronger and fresher.

society

society

circle

circle

uniform

defend

year

Shounian, commonly known as "staying up late", waits for the arrival of the new year. "Year" was commonly used with "year" in ancient China. Year is year, and year is year. The custom of observing the age has a long history. In the old twelfth lunar month, on the thirtieth night, after eating the New Year’s Eve dinner, people did their jobs according to their own division of labor. Parents should preside over the worship of gods, buddhas and ancestors to welcome the "lower world of god". Children go outdoors to set off firecrackers and fireworks, while women are busy preparing noodles and stuffing for jiaozi. Busy, the whole family, old and young, sat around the stove, eating dry goods, melons and fruits, talking about the past and the present, playing cards and playing chess, and staying up all night, which is called "guarding the old age." It is said that the custom of observing the age was very popular in the Jin Dynasty.

The customs of the year have been changing.

But what remains unchanged is people’s good wishes.

On New Year’s Eve, the year-old ends that night.

This is the most China day and night.

It is a magical intersection between the old year and the new year.

A year of sorrow and joy will pass tonight.

A unified beginning and a new tomorrow.

At the end of this year

A glass of wine to send the old year.

wake up after a sound sleep

It’s a new day.

It’s another prosperous and auspicious New Year.

Say "Happy New Year" to each other.

Cartography: Anna

Original title: "Yinhu welcomes happiness, saying New Year’s Eve, family fun"

Cosmetics sold 207.1 billion yuan in the first half of the year, and the beauty track ushered in a big outbreak.

In the first half of the year, cosmetics sold 207.1 billion yuan.

Since the beginning of this year, the cosmetics market has shown great vitality and potential.

On July 17th, the National Bureau of Statistics released data showing that in the first half of 2023, the total retail sales of social consumer goods was 22,758.8 billion yuan, up 8.2% year-on-year, of which the retail sales of cosmetics products was 207.1 billion yuan, up 8.6% year-on-year. In the first half of this year, the total retail sales of cosmetics exceeded 200 billion yuan for the first time, the highest level in history.

(Source: National Bureau of Statistics)

Among them, domestic cosmetics are not only popular in China, but also popular in overseas markets. According to the customs export data, the export of cosmetics rose steadily in the first five months of this year, the export volume and amount of beauty cosmetics and toiletries maintained a certain increase, and the demand of foreign consumers for domestic cosmetics has been greatly improved.

(Source: official website, General Administration of Customs of the People’s Republic of China)

In addition to the growth of the overall market, the performance released by some beauty listed companies has also increased, turning losses into profits.

Recently, the beauty leader Polaiya Cosmetics Co., Ltd. released the semi-annual performance forecast for 2023. It is estimated that the net profit of returning home in the first half of this year will be 460 million yuan to 490 million yuan, which will increase by 163 million yuan to 193 million yuan compared with the same period of last year, increasing by 55% to 65% year-on-year. It is worth mentioning that in the first quarter of this year, the growth rate of revenue and net profit of Polaiya was close to 30% year-on-year.

(Source: Polaiya official website)

Shanghai jahwa United Co., Ltd. predicts a net profit of 285 million yuan to 315 million yuan in the first half of the year, an increase of 81% to 100%. According to the company, in the first half of 2023, through the recovery growth of domestic business, the company digested the pressure of overseas business and achieved good business results.

Market participants said that according to the current growth trend, the cosmetics market will once again break through the 400 billion mark at the end of the year. All kinds of situations show that the beauty industry is recovering strongly, and China’s cosmetics market has shown strong market resilience and growth space.

2. Say goodbye to the cold winter and the beauty market will pick up.

Last year, it was considered by many people in the industry to be the coldest year in the cosmetics industry. According to the retail data of social consumer goods in 2022 released by the National Bureau of Statistics, the total retail sales of cosmetics in 2022 was 393.6 billion yuan, down 4.5% year-on-year. This is the first time that the total retail sales of cosmetics has experienced negative growth in the past decade.

(Source: National Bureau of Statistics)

Compared with last year’s overall negative growth, this year’s cosmetics retail data can still maintain a growth trend for six consecutive months, indicating that the beauty industry’s prosperity is constantly picking up and the market is continuing to pick up. So what is the reason for the strong recovery of the beauty market?

The macro environment, macroeconomic stability and improvement are quite key factors. With the social and economic recovery, the desire for beauty consumption is rising, which drives the growth of retail sales. Similarly, the company’s performance increase is inseparable from the recovery of offline channels and the continuous empowerment of online channels. The market is picking up, and the promotion of e-commerce activities has contributed. In the first half of this year, the March 8th Women’s Day was promoted and the 618 event was held, and major brands seized consumer demand, which obviously led to the outbreak of the beauty market. The data shows that from 33 billion yuan of cosmetics sales in May to 45.1 billion yuan in June, an increase of over 36.6% month-on-month, which is a huge increase. It is not difficult to see the positive promotion of 618.

(Source: National Bureau of Statistics)

With the development of the industry, the competition of beauty track is becoming more and more fierce, and the rising of domestic beauty brands is the obvious trend of current market development.

At present, China has become the second largest cosmetic consumption market in the world. With the huge consumption prospect in China, the beauty market in China has attracted many overseas beauty brands. In the past, compared with overseas brands, China’s cosmetics industry had a thin foundation, a late start and a low reputation. In the same stage competition, domestic beauty brands performed slightly worse. Now the situation has changed.

According to industry insiders, at present, national cosmetics brands are rising strongly to seize market share. This year’s Tmall Fast-moving 618 full-cycle turnover brand list shows that Polaiya has squeezed out OLAY, a brand owned by Procter & Gamble, to become the fourth.

Domestic beauty brands have also gone abroad, attracting a large number of overseas consumers. With the upsurge of traditional culture in China sweeping the world, Chinese makeup has brought fire to domestic beauty products. With culture and oriental aesthetics as the carrier, domestic beauty products such as porch-window box, concentric lock lipstick and snuff bottle liquid foundation have gone global and been sought after by overseas consumers. The packaging of products like Hua Xizi has been integrated into the traditional culture of China, creating a unique brand positioning and successfully gaining the attention of overseas consumers.

3. The beauty track ushered in the second half

The growing beauty market has attracted a lot of players, and the industry competition is intensifying. Under the trend of more mature consumers, weaker traffic dividends and improved industry supervision, the pattern of beauty industry will be reshuffled. In the fierce competition situation, market opportunities and challenges coexist. How should beauty brands be laid out?

The beauty industry accelerates the survival of the fittest. When the tide gradually recedes, deep R&D strength is indispensable for enterprises. Increasing product research and development and patent investment, enhancing product competitiveness with science and technology, and strengthening the cultivation of "internal strength" can help enterprises go further and longer in the industry. Empowering by science and technology can ensure the stability of product safety and efficacy, and brands with strong R&D strength are expected to occupy a larger market share.

Under the background of declining online traffic dividend and continuous price involution, the overall environment of the beauty industry has recovered, and offline channels have gradually stabilized. It is a way for the company to turn its attention to offline channels to increase revenue and profit. Beauty brands will build offline channels, continuously deliver products, and realize better realization by undertaking the traffic overflow after online investment.

E-commerce needs to find offline growth points, and it is the general trend to create a diversified channel layout under the beauty line. Some brands that once focused on online began to vigorously lay out offline channels. Polaiya, whose online channel accounted for over 90% of its main business income last year, said recently that this year will be the first year of its offline restart, and it will focus on the daily chemical channel and the department store channel. Freda Bio, which owns many effective skin care brands, such as Dr. Yael and Yilian, recently announced that it will fully launch offline this year, and proposed to build an offline market scale with a total return of 350 million yuan in the first year, covering the goal of 200 million offline consumers.

Nowadays, the beauty market is constantly subdivided, and market participants say that enriching the product matrix and making efforts in the mid-to high-end market may become the way for enterprises to break the ice. In China cosmetics market, the middle and high-end market is mainly occupied by foreign brands. In recent years, with the improvement of China’s cosmetics brand building ability and R&D strength, consumers have a strong desire to support domestic products, and some brands have begun to enter the high-end market, including Mao Geping and Polaiya, from which we can see the potential and possibility of local enterprises to develop high-end beauty cosmetics.

Generally speaking, the current domestic beauty consumption fever continues to rise, and the growth of retail sales has boosted industry confidence. In the next stage, with the economic recovery and consumption recovery, the cosmetics market is still promising. However, in the process of gradually restoring confidence in the cosmetics consumer market, enterprises with technology and strength can truly remain invincible in the market.

Reporting/feedback