Gross margin is back in double digits, has NIO passed the most dangerous moment?

In the new energy and new forces, NIO is the company with the greatest ups and downs, or even one of them.

In this year’s Hong Kong stock market, NIO is one of the few new energy vehicle companies whose share price has fallen. Since the beginning of the year, NIO’s share price has fallen by more than 24%, the ideal share price has risen by more than 80%, Xiaopeng has risen by more than 61%, and BYD’s shares have risen by more than 12%.

Behind the weakness of NIO’s share price, a very important reason is that in the current era of increasingly fierce competition for new energy vehicles, NIO’s overly expensive approach has added more uncertainty to it.

With the release of the third quarter report, this situation has changed. In the third quarter, NIO delivered 55,400 vehicles, an increase of 135.7% month-on-month, a record high, and gross profit margin increased by 4.8 percentage points month-on-month to 11%, exceeding market expectations (10.2%). NIO, who breathed a sigh of relief, rose nearly 10% two days after the release of the financial report.

More noteworthy than the financial figures is that NIO has finally begun to learn to save money, such as opening the power exchange alliance, abolishing non-core business departments, etc. But the crisis has not completely passed, and as new energy vehicles roll into the high-end car market, NIO will also face a new test.

This paper holds the following views:

1.NIO’s third-quarter results exceeded expectations, but it remains under pressure for the long term.In the third quarter, NIO deliveries and gross profit margins achieved rapid growth. But this largely relied on the untying of power exchange services and car purchases. Those who were unwilling to use power exchange services paid less, which stimulated sales. In July and August, NIO’s monthly sales were around 20,000 vehicles. But by September and October, NIO’s monthly sales had fallen back to about 16,000 vehicles.

2.NIO began to learn to save money.NIO eliminated redundant business, driving the proportion of sales and administrative expenses down 13.6 percentage points month-on-month. At the same time, NIO is also making active strategic adjustments and measures, such as opening up power exchange services to enhance scale effect and reducing vehicle manufacturing costs independently.

3.NIO is taking a big test in the high-end car market.All parties in the industry are collectively sprinting to the high-end car market. At the beginning of next year, Ideal and Xiaopeng will have new models priced at 300,000 yuan. And before the second half of next year, NIO will not have new models on the market. In the case of already declining sales of existing models, NIO’s competitive pressure will increase unprecedented.

01 Gross margin back in double digits

Gross margin has always been the most concerned indicator of NIO’s financial reports. Affected by factors such as falling sales volume and industry price wars. NIO’s business gross margin has stayed in single digits for three consecutive quarters. In the third quarter, NIO reversed this trend, and the automotive gross margin increased by 4.8 percentage points month-on-month to 11%, exceeding market expectations (10.2%).

NIO’s gross margin returned to double digits after three quarters, not only due to the decline in supply chain costs, but also due to the return of NIO’s sales volume to high growth.

The price of battery-grade lithium carbonate fell from 307,500 yuan/ton in July to 171,000 yuan/ton on November 1. Considering that the cost of batteries in pure electric models accounts for about 40%, the decline in battery prices will naturally bring about a decrease in car costs. NIO also mentioned in the third quarterly report that the company’s battery unit cost decreased in the third quarter.

At the same time, NIO sales also returned to high growth in the third quarter. In the third quarter, NIO delivered 55,400 vehicles, an increase of 135.7% month-on-month, and the delivery volume reached a record high. The dilution of amortized costs caused by the significant increase in car sales made NIO bicycle costs 7,000 yuan lower than in the previous quarter.

Among them, in the car sales structure, the ES6 with relatively high pricing has boosted sales by changing the model. Its sales share has increased from 25% in the last quarter to 50% in the third quarter, so that the average price of bicycle sales has increased to 314,000, an increase of 8,600 yuan from the previous quarter. The cost of each car has decreased by 7,000 compared with the previous quarter, but the price has increased by 8,600, so that the gross profit of each car sold by NIO in the third quarter is 35,000 yuan, which is 16,000 higher than the previous quarter.

Although the increase in sales volume and the increase in the proportion of high-priced ES6 have driven the improvement of the company’s gross profit margin. But in the long run, it is difficult to maintain the high growth of NIO sales. The reason is that the increase in sales in the third quarter was affected by the untying of power replacement and car buying services, and the disguised price reduction promoted the release of sales. In July and August, NIO’s monthly sales were around 20,000, but in September and October, the monthly sales volume had dropped to about 16,000.

Although the high growth brought about by the unbundling of power exchange services is a short-term event, changes in business strategy are having a profound impact on NIO’s profitability.

02 NIO starts to learn to save money

At the NIO Science and Technology Innovation Day two months ago, Li Bin said this: "Yesterday, He Xiaopeng asked a media person to tell me not to invest so much money, thank you, but NIO will continue to invest in the long-term."

Li Bin’s words were also in line with the outside world’s perception of NIO. Compared with other new forces, NIO would "burn money" more. But in the end, the situation was stronger than people.

In the third quarter, NIO’s sales and administrative expenses fell by 13.6 percentage points quarter-on-quarter. The decrease in expense ratio is due to NIO’s elimination of redundant business. "NIO will carry out adjustments involving organizational and resource investment directions, including reducing the redundant personnel and institutional settings by about 10%," Li Bin said in an internal letter in November. At the same time, NIO will also make adjustments to projects that have not been profitable for three years or have not contributed to the improvement of gross profit. Dolphin Investment Research forecasts that after the layoffs, it is expected to save NIO 10-1.50 billion per year.

Not only shrinking the business, NIO also adjusted its strategy. At the end of November, NIO successively cooperated with two major automakers, Changan and Geely, on the power exchange business. For a long time, due to the huge investment and the harsh requirements of the break-even point, the power exchange service has been a drag bottle for NIO’s profits. In the third quarter, the gross loss rate of the service business including the power exchange business reached -24%. That is to say, the gross profit earned by selling cars 350 million, all posted to the losses of other business 390 million.

After cooperating with car companies, the partners can not only share the investment pressure, but also increase the number of power exchange services per day at the power exchange station, improving the scale effect. Next, Li Bin also said that the possibility of independent financing of the power exchange business cannot be ruled out.

After rationally allocating non-core businesses, NIO also has more resources in the main automotive industry. Recently, it was reported that NIO has obtained independent production qualifications. If the news is true, it means that NIO’s seven-year OEM route has come to an end and it has become the last car company in the new force to obtain independent car manufacturing qualifications.

Not surprisingly, after obtaining the production qualification, it will be beneficial to the efficiency of NIO’s business. According to Li Bin, after purchasing the Jianghuai production line, the cost of independent production will decrease by 10%, and the gross profit margin of automobiles will continue to increase, reaching 15% in the fourth quarter.

Although NIO itself has started to learn to save money and is getting better and better, it is also facing new industry challenges.

03 The industry collectively sprints towards high-end cars.NIO faces new pressure

In NIO’s plan, the goal is to be China’s BBA and dominate the domestic high-end pure electric market for a long time. From the current point of view, this goal is progressing smoothly. From January to May this year, NIO’s market share of high-end pure electric vehicles with an average transaction price of more than 300,000 yuan reached 55.8%.

Although the performance is good, it may be difficult for NIO to continue to increase its share. Due to the different operating habits and aesthetic styles of consumers, cars are highly differentiated products. Toyota, the world’s largest automaker, has a market share of only 11%.

From the current point of view, NIO’s share in the high-end pure electric market has declined. In October, NIO’s share in the high-end pure electric car market above 300,000 yuan was 45.6%, a significant decrease from the first five months of this year. Another signal of bottleneck in the penetration rate of NIO’s high-end cars is that NIO will launch two sub-brands, Alps and Firefly, focusing on the market below 300,000 yuan.

At the same time, the new energy automobile industry has also begun to sprint to the high end collectively. According to later reports, next year, Ideal, Huawei, JK and other brands will launch products on the market with prices of 300,000 yuan and above.

In January next year, Xiaopeng MPV new car – Xiaopeng X9 with a pre-sale price of 388,000 began to be delivered to users. In the third quarter of this year, Xiaopeng bicycles cost an average of 196,000 yuan. In late February next year, the ideal first pure electric car priced close to the ideal Mega of 600,000 will also be delivered to users.

Interestingly, the timing of competing for high-end cars is precisely the empty window period for NIO products. NIO will not have new cars on sale until the second half of next year, and can only rely on the current eight cars on the NT 2 platform to sell. And two of the so-called main models – ET 5 and the new ES 6 – have obvious sales weakness. The fourth quarter sales guidance given by NIO 4.7-4 9,000, and it also shows a month-on-month downward trend. Before the second half of next year, NIO will only rely on stock car sales to deal with new high-end cars from brands such as Ideal and Xiaopeng. This means that the competitive pressure of NIO will increase unprecedented.

Although the unit price of NIO customers is higher, due to the crude development of NIO in the past, the gross profit margin of NIO is only 11%, coupled with the service business that has not been able to achieve profit returns, the overall gross profit margin of NIO is only 8%, which lags behind the gross profit margin of most mainstream new energy vehicle companies. Once NIO’s high-end market position is shaken, NIO will gradually lose its room to move around in the industry.

This also means that the danger of NIO is still not over. In the ever-fierce competition of high-end cars in 2024, NIO will enter a new round of life and death test.

AITO M9 will be officially released in the fourth quarter, with an estimated price of 500,000 yuan.

Fenghuang. com automobile news On April 17th, at the new product launch conference of nova 11 series and the whole scene, AITO Jiejie M9 made its debut as the final product. Yu Chengdong, managing director of Huawei, terminal BG CEO and smart car solution BU CEO, announced that Jiejie M9 would be officially released in the fourth quarter of 2023.

In terms of appearance, Wenjie M9 positioned the full-size flagship SUV, which brought a brand-new family design on the design concept of Wenjie series "extreme simplicity and purity", inspired by a touch of pure skyline. The front face modeling integrates innovative functions. The brand-new intelligent car light module integrates megapixel headlights, ADB (Adaptive High Beam) /AFS (Adaptive Headlight System) headlights, star digital matrix interactive system and aerodynamic air intake curtain, making the complicated things simple. The design of penetrating taillights echoes the design of headlights, forming an All In One design before and after, which can be recognized at a glance 100 meters away and is highly recognizable.

As for the interior, the M9 is equipped with a multi-screen full scene, which can be equipped with 10 screens, and the screen size ranges from 16 inches to 100 inches, which can meet any needs of driving, entertainment and work at any time. The layout is based on the original design intention of equal weight for six seats, which integrates innovative designs such as flat floor, flexible space change and ever-changing seat mode, and realizes the same flat floor as MPV, with three rows without steps and convenient access; The front and rear adjustable range of the second row is larger, and all the seats in the car are provided with electric slide rails, so that the space of passengers and luggage can be flexibly adjusted, making the ride more spacious and comfortable. All the seats in the car support electric adjustment, so that each seat is first class, and at the same time, it will provide a changeable seat mode of 3|4|5|6 seats. The M9 is 5230mm long and has a wheelbase of 3110mm.

In terms of configuration, Wenjie M9 has fully loaded Huawei’s full-stack smart car technology solutions, including the latest black technologies such as HarmonyOS Intelligent Cockpit, Huawei Intelligent Driving, HUAWEI xPixel, HUAWEI AR-HUD, AI Big Model, Sensor Federation, HUAWEI SOUND, and equipped with Huawei’s latest Harmony OS and Huawei ADS2.0 system.

The estimated price range of Wenjie M9 series is 500,000-600,000 yuan. The extended range version and pure electric version will be booked on April 17, 2023. Consumers can book through Huawei Mall and enjoy the corresponding rights of booking, which will be officially released in the fourth quarter of 2023.

How should parents give reasonable guidance to children who use new media to become younger?

Chen Qingwen, an associate professor at Tongji University, pointed out that parents should balance the opportunities and risks of the Internet when guiding their children to surf the Internet. Photo courtesy of respondents

A chart based on interview data of Chen Qingwen’s team. Photo courtesy of respondents

  I believe many people have had this experience: in some public places, "Xiong Haizi" played games or watched videos with electronic devices such as mobile phones and tablets, and the volume was so loud that parents turned a blind eye. Relevant research reports show that in China, children’s use of new media tends to be younger and more entertaining.

  On the one hand, new media devices that can be networked, such as mobile phones and tablets, have grown up with a new generation of children and once became a "part" of their bodies; On the other hand, the powerful educational function and interpersonal communication use of new media also make it a sharp weapon for learning and communication.

  As the mother of a post-00 generation child, Chen Qingwen, an associate professor at Tongji University’s College of Art and Media, faces the same problem: How and how often do children use new media? How should parents guide their children to use new media reasonably?

  With these questions, Chen Qingwen and his team randomly interviewed 30 families of children aged 3-10 in Shanghai to learn about children’s use of new media, parents’ attitude and involvement in children’s use of new media, and children’s views on parental involvement. On this basis, suggestions are given, and the research results are published in the core journal "Journalist" in August 2019.

  From "TV Children" to "New Media Children"

  As a post-1970s generation, Chen Qingwen admitted that he "grew up watching TV". When he was a graduate student at Fudan University 15 years ago, he studied the newly-emerging children’s channel in China. She said that the transition from "TV children" to "new media children" was even faster than the growth of a generation. And this change has brought a kind of trouble to parents: it is difficult to guide children to use new media reasonably with reference to their own experience.

  Some people may ask, how can they bring up the next generation when there was no TV in the older generation?

  "Because the new media is more interactive, participatory and creative than the traditional media, but without learning and guidance, children may just regard the new media as TV or game consoles." Chen Qingwen explained that, at the same time, new media are everywhere, and the content is all-encompassing, which is very different from traditional TV and other media. You can leave TV at home, but you can’t live without the Internet and mobile phones. In modern cities, "portable" and "always online" have become the common points for people to use new media.

  Chen Qingwen felt that "new media children" were born from the moment parents provided their children with new media equipment.

  Among the 30 families interviewed, one-third of the children have their own new media equipment, and the other two-thirds share it with their parents, many of whom will leave their unused new media equipment for their children to use. In terms of use, most children play games, followed by watching videos, and the third is the homework assigned by the school.

  According to statistics, more than half of the children use it for a long time, especially on weekends, almost for more than two hours a day. In the trend, many children in the kindergarten group have used new media for a long time, and the use time tends to lengthen with age. In addition, compared with the primary school group, the kindergarten group has a higher proportion of its own new media equipment, which shows that the use of new media is younger.

  In March this year, the Research Report on the Internet Use of Minors in China in 2018 jointly issued by the Youth Rights Protection Department of the Central Committee of the Communist Youth League and China Internet Information Center showed that as of July 31, 2018, the number of underage netizens in China reached 169 million, and the Internet penetration rate of minors reached 93.7%, which was significantly higher than that of the national population (57.7%) in the same period. According to the report, this is a direct manifestation of the expansion of Internet coverage and the decline of mobile traffic charges in China in recent years, and it is also closely related to minors’ strong interest in the Internet, strong learning ability and great application demand.

  Don’t let machines take the place of parents’ company

  In the interview, the research team found that children’s use of new media is mostly due to lack of companionship, especially preschool children. Because parents are busy and have no friends to play with, children have to turn to mobile phones and tablets; With the increase of age, more and more children choose new media.

  Some parents even choose to use new media instead of themselves to accompany their children. In public places such as restaurants, children are often seen watching videos while eating, perhaps just to let their parents "have a good meal". "She is good with this and doesn’t make any noise, as long as she doesn’t make any noise." A mother said.

  The interview also found that with the increase of age, more and more children are more willing to choose new media than playing with friends; And the older children are, the less satisfied they seem to be with their new media use time. Most of the respondents in the primary school group felt that their use time was insufficient, and one girl felt that two hours a day was not enough.

  "When parents use new media instead of accompanying their children, the actual price paid is likely to be huge." Chen Qingwen pointed out in the research report, "As they get older, they are more likely to rely on new media. At this time, even if their parents want to accompany them, they may continue to immerse themselves in communication with machines. When machines replace humans to accompany children, even if people come back, the relationship between children and machines is unbreakable. "

  Chen Qingwen combined expert opinions and personal experience to give some suggestions to parents. "If you want to control underage children’s use of new media, try not to let them own their own equipment, just lend it to him, that is to say, give children the right to use it, while parents retain the right to control it. As for the balance between control and privacy, you need wisdom."

  She also said that although the current academic research is inconclusive about when to start controlling children’s use of new media, she feels that parents who are determined to control their children should take action as soon as possible. "It would be much better to let him know that parents should take care of it early than suddenly."

  Why can other children play computer games, but I can’t?

  In this "equipment battle", "children crying and parents yelling" is a common scene. The research team found that most children’s tricks are crying and "lai", and they can play as long as they can until their parents take away the equipment.

  Interestingly, on the question of whether parents are worried about their children’s use of new media, parents’ attitudes are polarized: 17 are worried, and 13 are not worried, either very supportive or very opposed.

  In the interview, some parents thought that "this is a trend" and "this thing will be accepted sooner or later", so they were not worried at all. A mother said: "everyone has it, but they just can’t fall behind." If she doesn’t understand, she feels like she is behind others and can’t keep up. "

  The attitude of parents who hold opposite opinions is also very clear, and their concerns are mainly reflected in three points: First, they are afraid of their children’s addiction; The second is to worry about the harm to vision; The third is to worry about the negative impact of inappropriate content such as violence.

  Chen Qingwen believes that such "two extremes" attitude makes parents’ work of disciplining their children in trouble. "Why he can I can’t, this is a child’s question. For example, children will say that classmates can use computers when they go home. Why can’t I? "

  Another reason is the change of family education style in China. “‘ Authoritative education ’ It is not easy to work. In the past, parents could answer no, but now they are likely to get a crying and keep asking. After all, children’s energy is much better than ours. "

  The research team also found that, as in the TV era, the way parents intervene in their children’s use of new media is mainly "restriction", and the time limit is more than the content limit.

  Most parents in the interview only know that their children are playing games or watching videos, but they don’t know what games or videos their children are playing. Some academic studies believe that restrictive guidance strategies can not only effectively help solve the problems that children may encounter on the Internet, but also easily lead to the decline of the quality of parent-child relationship or frequent conflicts.

  For children who are out of control, whether they cry, lose their temper or cheat, the parents interviewed said: "Let her cry", "Ignore her" or "yell at him", and some parents will be patient and reasonable, but children will still enter the cycle of yelling if they don’t listen.

  The mother of a 9-year-old boy said that she usually talks reason first and scolds him if she doesn’t listen. If she scolds him, she will have to yell at him at him at a higher volume. If she doesn’t, she will have to be punished, such as not using new media for a few days or increasing the number of homework. Most parents can insist on not using their children’s noise, but the children’s crying or losing their temper will continue.

  Academic research proves that parents’ positive intervention is more effective.

  "We just did a small-scale interview in Shanghai." Chen Qingwen said, "If you want to give scientific advice, you need to do extensive and long-term investigation and research in different cities and rural areas across the country."

  But before that, some countries encountered these problems earlier than China, and their academic research may provide reference.

  Chen Qingwen introduced that since the 1980s, the research on parents’ involvement in children’s media use has been popular in the United States. After 1990, the American government emphasized the role of parents in family policy, and related research received more attention. The research points out that the two main intervention methods adopted by parents are "making rules" and "restricting"; The actual behavior of parents can be divided into positive intervention methods such as parent-child discussion and negative intervention methods such as prohibiting or restricting use, and parents adopt the mode of sharing viewing between parents and children.

  In another paper on the use of new media by minors by British scholars in 2007, the author divided the intervention strategies of parents for their children to use new media into four categories. In addition to joint use and restricted use, parents will also adopt "technology restrictions", that is, use technology software or set restrictions on their children to prevent them from using unauthorized digital media content; And monitor children’s use of websites, letters and games in different ways. Their conclusion is that when parents take active measures to intervene their children’s use of new media, such as sharing or discussion, the negative influence of their children’s use of new media can be effectively reduced.

  Domestic research on the media also believes that parents’ intervention can bring positive results.

  For example, in the psychological aspect, the correct intervention of parents and families can reduce teenagers’ psychological anxiety, help build self-confidence and self-esteem and affect teenagers’ mental health; In terms of learning and risk reduction, parents’ active intervention in media use can improve teenagers’ learning effect, reduce the possible negative impact of violent content in the media, affect the formation of children’s gender role attitude, reduce children’s fear response to media content, and reduce some network risks that children may encounter.

  At the same time, parents’ ideas and the motivation and methods of intervention are extremely important.

  Foreign studies have found that the more parents want the Internet to have a positive effect on their children and think that the Internet will have a negative impact on their children, the more they will get involved in their children’s use of new media. Domestic research also points out that the more time online is strictly restricted by parents, the more recreational motivation teenagers tend to use the Internet.

  "The key point may not be whether children should use new media or how to use new media at all, but where the parents are and where the children’s minds are. Studies in different fields have pointed out that modern society is busier than before, and how parents create a happy parent-child environment will become an increasingly important issue. Quality companionship between parents and children is one of the necessary conditions for shaping parents. " Chen Qingwen’s interview report wrote.

  Communicate with your child with your heart

  What do children think of their parents’ control? The interview results show that on the whole, half of the children think that their parents are reasonable; At the same time, with the growth of children’s age, the proportion of recognition of parents’ intervention control has increased. And "making rules together" and "keeping your word" have become the common standards for children to measure the rationality of parental discipline.

  Taking nine children in the kindergarten group in the interview report as an example, Min Min, a 4-year-old (all minors below are pseudonyms), feels that his parents are much more in charge; Tingting, 5, feels that her parents don’t care much because they are reasonable. Zhu Zhu, a 5-year-old, said that she was afraid of her father because he was very fierce when he was angry and would say, "I’m telling you! I’m telling you! No matter how, I will kick you downstairs "; Kiki, Doll and Lingling, both 6 years old, are afraid of their mother and think her mother is too fierce.

  Among the 21 children in the primary school group, 13 children feel that parental control is reasonable, 5 children feel unreasonable, and 3 children are uncertain. Xiao Han, a third-grade student, told the interviewer that she felt that the parental control was sometimes reasonable and sometimes unreasonable. The unreasonable reason was that the mobile phone was forcibly taken away before the agreed time. "My mother said several times that she would play for me for 10 minutes. I didn’t expect that when it was almost two minutes, she said that it was 10 minutes. I didn’t want to, so my mother dragged me away. She said that it was evening and I couldn’t play any more."

  The interview report suggests that from the perspective of social environment, there are two urgent matters: first, timely education courses related to new media literacy should be provided at different stages of children’s growth; The second is to improve parents’ ability to master new media and new technologies.

  "Not all parents have the time and energy to participate or study independently. I think we can start with school education and issue some principles and suggestions for children to take back to their parents." Chen Qingwen explained.

  In addition to improving their understanding of new media and technologies, parents should also attach importance to communication between parents and children and accompany their children to use new media by guiding participation. Especially in the method of making rules, parents need to talk to their children often. "In fact, kindergarten children have a very clear concept, this is good, how long should it take. If the rules are made by the children themselves, or if the parents discuss with him, the children will be more willing to abide by them. "

  When attending international academic conferences, Chen Qingwen often discusses these issues with foreign scholars: when to give children new media equipment, how long the screen time should be in a day, and when to let children have their own social media accounts. "Although some organizations will give suggestions, for example, the screen time is no more than one hour or two hours a day, and general social software suggests that people are over 14 years old, but parents have different ideas, different social situations, different family situations, and different children, so you can refer to some research-based suggestions, but in the end you have to find a way that suits you. I don’t think there is an absolute standard."

  "According to the needs" is Chen Qingwen’s main basis. Her son rarely contacted new media when he was in kindergarten, but when he saw that other children had their own mobile phones, he said that he also wanted to have their own mobile phones. But this wish has not been realized until now that his son is going to middle school, because his son has no need to carry a mobile phone. When she entered middle school, her son needed a computer for some of his homework. The school asked for a laptop for her child, so she bought the laptop she wanted, but only if it was used for study and could not be loaded with games. "At present, the school has just started, and there are still any problems in the future. I am also walking and watching."

  "In our research, we found that intentional is better than unintentional. As long as you are intentional, children can feel it. My suggestions are: teach students in accordance with their aptitude, learn from each other, and communicate with your heart. From the perspective of communication, intentional communication can enhance feelings and reduce misunderstandings, which is actually the most effective method. " Chen Qingwen said. (China Youth Daily China Youth Network Trainee reporter Wei Qimeng)

Exploring the path of intelligent social governance The exchange meeting of research results of intelligent social governance in Chengdu-Chongqing economic circle was held today.

Cover journalist Qin Yi Zhao Yi

Strengthening the country by network is an important strategic task and proper meaning to realize Chinese modernization. Empowering social governance by using internet technology and information technology is a topic that Sichuan and Chongqing jointly explore at present. What are the achievements of intelligent social governance in the two places? What are the future development directions? On December 19th,The exchange meeting on the research results of intelligent social governance in Chengdu-Chongqing Shuangcheng Economic Circle was held. Experts and scholars from all over the country gathered in Rongcheng to discuss the intelligent social governance in Chengdu-Chongqing Shuangcheng Economic Circle.

Exchange meeting site

Zhang Wei, a researcher and doctoral supervisor at the School of Public Administration of Sichuan University, discussed the intelligent social governance reform of the twin-city economic circle in Chengdu-Chongqing area with the theme of data opening and sharing. He explained the significance of intelligent social governance by comparing digital social governance with intelligent social governance in key areas, technical essentials, governance means, tasks and objectives. He mentioned that in the governance of intelligent society, the key value of data opening and sharing lies in optimizing the construction and urban planning of social intelligent cities, and improving the personalization and generalization of social services.

Sun Ying, a professor and master tutor at Southwest University of Political Science and Law, discussed how to fasten a "safety belt" for the high-quality development of the digital economy with the theme of studying new legal relations in the digital economy era. In view of the phenomenon of large-scale infringement of personal information, she suggested continuing to strengthen administrative law enforcement and promoting the implementation of the high fine system. In addition, a personal information protection fund can be established to mobilize multiple forces to protect personal information rights and interests.

Zeng Runxi, a teacher and doctoral supervisor of Chongqing University, shared his research results with the theme of improving the governance efficiency of intelligent society. He mentioned that in order to optimize the governance path of intelligent society, it is necessary to realize "upper and lower governance" and form different role setting structures in digital space and physical space. The upper layer needs to control more management scope through technology, and the lower layer needs more information and data to realize administrative transaction processing.

Professor Chih Wei Tang of the University of Electronic Science and Technology of China analyzed the current situation, difficulties and economic and social problems arising from the supervision and enforcement of digital platform algorithms, and put forward countermeasures and suggestions. He said that the algorithm core processing of the digital platform involves business secrets of enterprises, and algorithm supervision should not be "one size fits all" for algorithm control. It is necessary to strengthen effective government supervision and reduce the cost of enterprise compliance.

Huang Dongdong, deputy dean of the School of Cyberspace Security and Information Law of Chongqing University of Posts and Telecommunications, analyzed the big data of cyber security patents, and put forward suggestions for the industrial development of the Shuangcheng Economic Circle in Chengdu and Chongqing. In his research, he found that the twin-city economic circle in Chengdu-Chongqing region has certain early accumulation and relative advantages in the application of security and security situation awareness, and universities are the main innovation subjects.

Yu Xin, an associate professor at Tsinghua University School of Journalism and Communication, shared his understanding of the current intelligentization of social governance with "The Big Language Model of Twin Public Opinion Space and the Intelligentization of Social Governance". Through the research on the hot public opinions in Sichuan and Chongqing, he found that in the previous network impressions, Sichuan and Chongqing had labels and impressions such as tourist hotspots and online celebrity clusters, and we can focus on these aspects in the future.

The relevant person in charge of the Network Information Office of Sichuan Provincial Party Committee said that in order to better promote the comprehensive network governance and empower the modern governance of the twin-city economic circle, Sichuan and Chongqing should combine the comprehensive network governance with the promotion of urban and rural grassroots governance system innovation and capacity building, explore the deep application of intelligent technology in people’s livelihood fields such as education, employment, social security, sports, housing, transportation, helping the disabled and providing for the elderly, solve the pain points and difficulties in social governance, and promote the formation of a comprehensive network governance pattern of online and offline integrated governance.

At the same time, around the key areas of cooperation in Chengdu-Chongqing area, such as smart transportation, energy security, smart water conservancy, industrial development, eco-livability, and services for the benefit of the people, we will guide the construction of a number of digital application scenarios that are visible, tangible and well used, and launch more intelligent governance samples with the recognition of Sichuan and Chongqing, forming a demonstration and leading role in the west, and promoting the achievements of Internet governance construction to benefit more grassroots people.

In the next step, we will explore intelligent governance in cooperation around key areas such as smart transportation, energy security, smart water conservancy, industrial development, ecological livability, and service for the benefit of the people in the Chengdu-Chongqing economic circle, build a number of digital application scenarios that are visible, tangible and well used, and launch more intelligent governance samples with Sichuan-Chongqing recognition, thus forming a demonstration and radiation-driven role in the west.

Speed does not lose high-speed rail! How does badminton, the king of ball speed, fly?

Speaking of badminton, I think everyone is familiar with it. Even if you are not a badminton fan, you will often see players in various sports venues or squares, and you will be right.Lindane, Li Zongwei.When famous players hear about it.


However, even fans who often play ball may not have noticed it.Details of badminton flight.

Why is badminton designed like this? Does it always fly with its heavy ball head facing forward? How far can badminton fly? Does it spin when it flies?Presumably these questions have aroused everyone’s curiosity, so let’s walk into the text together ~

Part 1: Flip of Badminton

Anyone who has played badminton will notice a phenomenon, that is, when the ball flies towards you, it is almost always.Ball head in frontThe gesture. Put yourself in the other’s shoes, and your opponent will certainly see the same phenomenon. Then there is only one possibility, that isAfter each side hits the ball, badminton will turn over.Then turn around and fly back. The question is, is the U-turn completed at the moment of hitting the ball? Maybe we take it for granted.

Fig. 1 (a) a snapshot with an initial velocity of about 18.6 m/s and an initial angular velocity of about 206 rad/s (with an interval of 5 ms); (b) Snapshots with an initial velocity of about 10.4 m/s and an initial angular velocity of about 28 rad/s (interval of 6.5ms). | The picture is from the literature [1]

Unfortunately, the answer is not like this. As shown in the above picture, the moment of hitting the ball is basically atAbout 1msIt’s done, but it’s usuallyAbout 20msThe ball can be turned over. And then go through itDamping oscillationIn order to make its ball head point in the direction of speed. In order to show this process more intuitively, we draw the relationship between the ball head pointing and the speed direction in Figure 2.Angle φEvolution over time. amongτ, τ and τThey respectively represent the time from the first turning to the ball head facing forward, the damping oscillation time and the characteristic time to reach stability.

Fig. 2 Evolution of included angle in two cases. | The picture is from the literature [1]

It can be seen that after 0.1-0.15s, badminton seems to have a forward posture, so except for some special hitting situations, weIt is difficult to capture with the naked eye.The process of rapid turnover adjustment of badminton after hitting the ball. So … Does this flip behavior of badminton have anything to do with its own structure?

Fig. 3 Force analysis of badminton when traveling | The picture is from the literature [1]

The answer is yes. Badminton byCork ball head and skirt structure made of goose feather/duck feather or plastic.Composition, in which the ball head is heavier and the skirt structure has a larger cross-sectional area. We might as well abstract this feature as identified by B and C in the figure.Large mass and large cross-sectional areaSkirt area andSmall mass and small cross-sectional areaThe ball head area of.

When flying, assuming that the direction of the ball head is not consistent with the direction of the speed, and there is an included angle φ, the air resistance acting on B and C will generate a moment with the center of mass G as the reference point respectively. On the one hand, the skirt structure has a large cross-sectional area and air resistance.FBigger, on the other hand, BG is longer than GC, so the ball will inevitablyRotate counterclockwise around the center of mass until the ball head points in the direction of speed..

Figure 4 Badminton shape schematic. | The picture is from the literature [1]

If the above weight distribution is easy to think of, then aboutWhy did badminton choose an opening angle close to 45?Perhaps few people have thought about it. In fact, this is closely related to whether badminton can experience flipping and achieve stability faster. Some scholars have recreated the shape and mass distribution characteristics of badminton with small iron balls and skirt structures made of plastic, and released it freely in the way of skirt structure facing down in water, so that it can turn over during sinking, as shown in the following figure.How does its opening angle affect the turnover and stabilization time?.

Fig. 5 How the opening angle affects the turnover and stabilization time. | The picture is from the literature [1]

Visible, opening angle is too small and too big is not conducive to the stability of the flip, and fromThe range of 30 to 90.Will experience a stable and fast platform area. Obviously, the opening angle of badminton falls in this area.

Part 2: the flight path of badminton

Different from tennis, badminton’s flight trajectory is greatly influenced by air resistance because of its light weight.Seriously deviate from the shape of parabola. Generally speaking, the equation of motion followed by badminton flight can be written.

Among them, and are the mass, density and cross-sectional area of badminton, respectively, and the speed,UandgIs the vector of velocity and acceleration of gravity, and is a constant related to the test conditions. It is not difficult to understand that in addition to the gravity term that makes it do oblique throwing, the ball will also receiveResistance whose magnitude is proportional to the square of velocity and whose direction is opposite to velocity.. And the specific trajectory is made up ofSize and direction of initial velocityDecide. For badminton, we can define a quantity related to its flight characteristics, which is called pneumatic length.

For the badminton we use, this distance is about 4.6m, which determines that the final stable speed of the badminton is U=6.7m/s when it falls freely and vertically. In the picture below, we can see the flight trajectory of badminton at different initial speeds.Comparison between calculated value (solid line) and actual value (scattered point)It can be seen that the motion equation can predict its trajectory well.

Fig. 6 Comparison between the calculated value and the actual value of badminton trajectory with different initial speeds. | The picture is from the literature [1]

So how far can badminton fly? We might as well look at the changing trend of the distance X traveled by badminton when it falls to the same height as the starting height after approximately throwing. According to the above equation of motion, we can find that this distance depends on the initial speed of badminton. willFlight distancexOn the relationship between initial velocity elevation angle θ and velocity magnitude uDrawing, you can get the following results.

Fig. 7 Variation of travel distance (m) with initial speed direction (elevation angle) and speed.

As long as you have played badminton, this picture must contain some information points that you can empathize with. For example, we find that no matter how hard we use, it seems that badminton always flies."come to an abrupt end" near a certain distance. The upper speed limit in this picture has been reached.140m/sHowever, the farthest distance that can be reached is only 13.83m. And the badminton court we use13.4m longThat’s why badminton can only hit the opponent’s backcourt from one side even if it tries its best, and it won’t play much even if it is out of bounds.

Fig. 8 Schematic diagram of badminton court

Some readers may ask, is it too exaggerated to set the upper speed limit to 140m/s? Can badminton fly so fast? In fact, it is not an exaggeration. In July 2013, Chen Wenhong, a Malaysian men’s doubles player, killed the ball under the ideal conditions in the laboratory.493km/hThe amazing speed is equivalent to136.9m/s. There are also reports that Danish player Codin has played.506km/hKill the ball record, namely140.6m/s. Even in the game, Codin played.426km/hSuper fast kill ball. thereforeBadminton is the deserved king of ball speed!

Fig. 9 The ultra-fast kill of Keding 426 km/h.

In fact, the flight trajectory of badminton is also related toType of ballRelated. We usually have two kinds of balls made of feathers and plastic. The following figure shows the difference of their flight paths.

Fig. 10 Trajectory comparison between feather ball and plastic ball. | The picture is from the literature [1]

On the one hand, with the same initial angle and speed,The reachable range of plastic ball making is larger than that of feather ball making.; On the other hand, feathering is near the highest point of flight.Greater curvature, trajectoryCloser to the "triangle".

Figure 11 Plastic balls


This is because under the condition of ensuring firmness and low cost,Plastic ball making tends to be biased.. This also means that feathering can be done without going out of bounds.Fly at a faster speed, thus reducing the opponent’s reaction time. Therefore, feather ball making is often more popular.

Part 3: the rotation of badminton

You may have noticed that badminton feathers areArranged obliquely in the same clockwise directionYes. Is this an irrelevant design? Actually, it is not. We can think of each feather as a thin plate, which will be subjected to when traveling in the fluid.The direction is perpendicular to the plane and opposite to the speed direction.The force, as shown in the figure below.

Fig. 12 Stress diagram of feather | The picture is from reference [1]


We immediately think that the resultant force of these forcesWill make the whole badminton rotate around the axis!When badminton travels at a faster speed, the greater the resistance, the greater the torque generated by the resultant force, which makes badmintonFaster rotation. If we multiply the angular velocity ω by the axial radius r of the feather to get the linear velocity at the feather, we will find that it is almost the same as the traveling speed.Linear relationship.

Fig. 13 Relationship between badminton rotational linear speed and traveling speed | The picture is from the literature [1]

Moreover, compared with plastic balls,The rotation speed of feather ball is obviously faster in flight.. The analysis shows that faster rotation will limit the precession of feather pelletizing, whichConducive to the stability of feathering in flight..

It seems that the flight details of badminton are really a university question. In this process, we can not only learn a lot.Physical knowledge, but also help to understand the ball.Flight path. After watching the push, the little friends quickly pick up the racket and see if the skills are improving ~

References:

[1] Cohen C, Texier B D, Quéré D, et al. The physics of badminton[J]. New Journal of Physics, 2015, 17(6): 063001.

[2] Badminton (Ball)-Wikipedia

[3] Kwan M W. It’sa Birdie… It’sa Shuttlecock… It’s Badminton: The Physics Behind the Badminton Shuttlecock[J].

[4] The world record of killing balls has reached a new high!


Editor: clouds open and leaves fall