Game Developers Conference is coming, pay attention to the game ETF(516010) opportunity.

The game developers’ conference struck, focusing on the game ETF(516010) opportunity. The intraday turnover exceeded 66 million yuan, and the net inflow in the past 10 days was nearly 100 million yuan.

The Global Game Developers Conference (GDC) was held in San Francisco from March 18th to March 22nd. The conference will hold hundreds of conferences covering AI, VR, AR, audio, vision, programming and other topics. The participating manufacturers include Microsoft, Google, NVIDIA, Meta, Adobe, EPIC, Unity, Roblox, Tencent and Netease.

In addition, many media reported recently that the national service of Blizzard Games is expected to officially announce its return within one month. It is understood that after the return of Blizzard National Service, Netease Entertainment Guangzhou will be responsible for the operation and Thunder Fire will be responsible for the marketing, which has aroused the concern and expectation of the majority of game lovers.

In addition, the continuous issuance of version numbers, the increase in number and the approval of heavy game version numbers have boosted industry development and market confidence, and driven the opening of new product cycles.

With the development of artificial intelligence, various tools such as art, music and copywriting have been initially implemented and iterated, and connected to the game engine for the convenience of developers. In terms of game development, some companies have initially integrated AIGC creative tools into their own art development process. In terms of gameplay innovation, AI native gameplay mainly focuses on medium and light products, but heavy products have been integrated with AI content in art design to enhance player experience and payment.

Investors who don’t have a stock account can grasp the investment opportunities of the game sector through the linked fund of the game ETF (012729).

Note: Market views change with the change of market environment, and do not constitute any investment suggestions or commitments. The individual stocks mentioned in this paper are for reference only, and do not constitute stock recommendation, nor do they constitute a forecast and guarantee for the performance of the fund. If you need to buy related fund products, please choose products that match the risk level. The fund is risky and needs to be cautious in investment.

Online games are addictive and forced to chat naked … The safety of online use for teenagers’ holidays deserves attention.

  The safety of teenagers’ holiday internet is worthy of attention.

  Our reporter Zhou Xiaopeng

  With good results in the senior high school entrance examination, Xiao Zhang, who lives in Shijiazhuang, Hebei Province, was successfully admitted to the target high school, but before long, this joy was replaced by constant quarrels between him and his mother. In the mother’s view, during the holiday, Xiao Zhang was either a computer or a mobile phone every day, and spent too much time indulging in the Internet. Xiao Zhang, on the other hand, is quite opposed to this: I finally have a holiday to relax, so why can’t I play more mobile phones and games?

  In fact, for this generation of teenagers who were born with a mouse and grew up with their mobile phones, the internet has become an indispensable part of their lives, especially when they enter the holidays, and the time spent touching the internet has increased greatly, making it easier for them to indulge in the internet and cannot extricate themselves. In addition, because teenagers generally lack social experience and don’t know how to protect personal privacy, they are more vulnerable to bad information, online fraud and even illegal acts on the Internet.

  Experts told the "Legal Daily" reporter that when children enter the holiday "mode", they can spend more time online and relax their entertainment appropriately, but they must make reasonable plans and not be "cyber slaves". Schools and parents should actively guide teenagers to surf the Internet healthily, so as to use the Internet safely, in a civilized and healthy way.

  Prevent online game addiction

  Looking up at the computer, looking down at the mobile phone, regardless, playing games all night, this is a true portrayal of many teenagers’ holiday life. In June 2018, online game addiction was officially declared as a mental illness by UNESCO. Statistics show that teenagers between the ages of 12 and 16 are high-risk groups of Internet addiction. The proportion of global teenagers who are over-reliant on the Internet is 6%, and the proportion in China is close to 10%.

  When he noticed this data, Zhang Rucai, a deputy to the National People’s Congress, was really shocked. "The bad content of online games is imperceptibly affecting teenagers." Zhang Rucai told reporters that the development and operators of online games only seek to maximize economic benefits, which has caused unhealthy online games to become a public hazard that destroys the physical and mental health of young people.

  In 2018, Zhang Qingbin, a representative of the National People’s Congress, received a petition signed by many parents on strengthening the management of online games and legislating as soon as possible, calling for legislation to save many children, which made him systematically pay attention to the problem of teenagers indulging in online games. Zhang Qingbin said that he really felt the seriousness of this problem in his hometown in rural areas. "Many teenagers drop out of school early because they are addicted to online games and become idlers. There are also many teenagers who have all kinds of psychological problems and even make some excessive behaviors because they are addicted to online games." As a result, Zhang Qingbin launched research, went deep into schools and communities to listen to the voices of the masses, and consulted with departments such as culture and online information to understand the situation. "Many online games design various links according to people’s psychological needs, and induce players to fall into addiction layer by layer, which is difficult to resist the temptation for teenagers’ immature psychology." Zhang Qingbin said.

  In medicine, internet addiction is a clear concept, which usually refers to indulging in online games. When online games are stopped, withdrawal symptoms such as irritability, anxiety and sadness appear. Lose interest in other hobbies before, even if you understand the impact of the game on yourself, you still focus on the game; Use online games to escape or relieve negative mood.

  In the view of Xiao Zhang’s mother, Xiao Zhang has already had some symptoms of Internet addiction. "The child’s addiction to the Internet not only leads to the damage of the parent-child relationship, but also aggravates the parent-child conflict. More seriously, his daily life rules are completely broken, and he is afraid that a holiday will cause him various psychological obstacles." Xiao Zhang’s mother said.

  Beware of illegal network infringement

  "Can you send me a nude photo of your bust? I promise to treasure it myself and not let others see it." Last winter vacation, Xiaomei (a pseudonym), a 14-year-old junior high school student, met a small town (a pseudonym) who claimed to be 15 years old on a short video App. After the two sides closed each other, the exchange was transferred to QQ. Just after half a month of understanding, the town made such a request to Xiaomei for the first time.

  Although she was worried, Xiaomei agreed to the other party’s request, and this became the beginning of a nightmare. Since then, the town has been making unreasonable demands, from naked photos to naked videos, and the original pleading has also become a threat.

  Xiaomei’s reticence and trance made her mother discover the clue. After repeated questioning by her mother, she confessed everything, and Xiaomei’s parents immediately called the police. The police of the Criminal Police Brigade of Qiaoxi Public Security Bureau in Zhangjiakou City, Hebei Province, who was in charge of the case, launched an investigation through the QQ number of the suspect and quickly locked the suspect Yang and arrested him.

  The police found out that Xiaomei’s so-called friend town was completely fictional by Yang, and the school, information and photos were all false. Yang’s real identity was from Tianjin, born in 1978, married and had a criminal record of theft. Yang often chats through various online social software and chooses a minor like Xiaomei to cajole and threaten, and Xiaomei is not his only chat object. At the end of March this year, Yang was prosecuted by the People’s Procuratorate of qiaoxi district, Zhangjiakou City for allegedly molesting minors.

  "It is best for minors not to make friends online." In the preliminary investigation, faced with the interrogation of the prosecutor of qiaoxi district Procuratorate in Zhangjiakou City, who was in charge of the case, Yang confessed his illegal behavior, and also said that minors should take warning. On June 12, the court made a first-instance judgment, and the defendant Yang was convicted of child molestation and sentenced to two years and six months in prison.

  Not only that, because teenagers’ physical and mental development is not fully mature, their vigilance is low, and they are easy to trust others, so they can easily become "things in the bag" of cyber criminals. In addition to browsing unhealthy web pages and contacting bad information on the Internet, all kinds of fraud such as false enrollment, part-time job, recruitment, etc. often target at the student group. For example, defrauding the client’s funds in the name of online billing is a common online fraud method used by scammers during the summer vacation. In fact, these fraudulent means are not novel, but they have long appeared in holidays, and students are deceived every year.

  "Don’t click on pop-ups and unknown links that appear in the process of surfing the Internet at will. You should be vigilant when making friends online, don’t expose your own and others’ private information, don’t threaten, insult or slander others on social platforms, don’t make or spread unconfirmed information, and stay calm and confident when encountering cyber bullying, and communicate with teachers or parents in time … … These should be common sense when teenagers touch the net. " Zhang Qingbin said.

  Guide children to use the net safely.

  Wu Guiping, chief of juvenile criminal prosecution department of qiaoxi district Procuratorate in Zhangjiakou City, said that Internet social interaction is widely used now. As parents, they should pay more attention to their children’s mental state and make friends, and make timely safety education, let them know the uncertainty of online friends through equal communication, and tell their children the principles of making friends in the virtual world. If you don’t tell each other your real identity information easily, you can’t send photos and videos involving privacy to each other.

  "Parents should also consider the psychology of adolescents. They are no longer satisfied with their parents’ care and love, but have more needs to communicate with others. I hope that friends with similar aspirations and interests can’t blindly suppress this desire to make friends. We must correctly guide and help them and inform them of the bottom line and principles of communication." Wu Guiping said frankly.

  In fact, the network security literacy level of minors is closely related to personal personality factors, family factors and school environment. In addition to preventing internet addiction and using the internet scientifically and rationally, protecting personal information, spreading positive values, not believing in rumors and not spreading rumors should also become the proper meaning of safety education for minors using the internet. In this regard, both family education and school education should actively make up a lesson.

  According to Chu Zhaohui, a researcher at the Chinese Academy of Education, minors have realized the convenience of the Internet early, but they have no independent ability, which is the main reason for Internet addiction. "For parents, it is necessary to give their children a sense of rhythm in regulating the use of the Internet, such as giving them a fixed time to browse the Internet every day and giving guidance to what they browse, so that they can form their own ability to plan their lives as soon as possible." Chu Zhaohui said.

  Chu Zhaohui believes that at present, in most primary and secondary schools, mobile phones are forbidden to be brought into the campus. How to spend their spare time and holidays is a test for students and parents. "Some parents will regard mobile games as a reward for their children. I think this is a misunderstanding. It is very important to enhance children’s autonomy and enrich their lives. "

  At this year’s National People’s Congress, Zhang Rucai and Zhang Qingbin both put forward suggestions on strengthening the management of online games and legislating as soon as possible, and suggested that the National People’s Congress Standing Committee (NPCSC) should introduce the online game management system to protect teenagers’ physical and mental health, the network protection law for minors and other relevant laws and regulations as soon as possible.

  "It is necessary to strengthen government supervision, improve the online game real-name authentication system, and purify the online game content and network environment." Zhang Qingbin said that we can learn from the examination and approval system for film and television works, strictly examine and approve online games, and at the same time introduce functions such as "face-brushing camera" to prevent registered users who do not match their actual identities from logging in.

  Relevant experts pointed out that during holidays, parents should guide their children to establish correct network values and teach them to learn the behavior of using the internet safely. Parents and children can discuss and formulate mutually acceptable online time, which will not affect their daily life and rest, so as to establish a good time concept; Parents should pay more attention to their children’s online process, listen more and admonish less, avoid damaging the parent-child relationship with critical words, spend time with their children, and cultivate their interest in the real world, instead of focusing on the virtual online world.

CCTV.com



  Xinhua News Agency: Basketball originated in 1891 and was invented by American PE teacher Dr. james naismith. At the 1936 Berlin Olympic Games, the men’s basketball game was listed as an official event for the first time. Women’s basketball was not formally included until the 1976 Montreal Olympic Games. There are only two gold medals for men’s and women’s teams in the Olympic Games.

  In the past 16 men’s basketball and 8 women’s basketball Olympic Games, the American men’s basketball team won 12 championships, the Soviet men’s basketball team won 2 championships, and the Yugoslav and Argentine men’s basketball teams won 1 championship each. The American women’s basketball team won five championships, the Soviet women’s basketball team won two championships and the CIS women’s basketball team won one championship. China’s best result in the Olympic Games is that men are eighth (26th Atlanta Olympic Games and 28th Athens Olympic Games) and women are second (25th Barcelona Olympic Games).

  Rules of the game: The Olympic basketball game consists of four sections, each of which lasts for 10 minutes. If the score is equal at the end of the fourth quarter, one or more 5-minute overtime will be needed to continue the game until the winner is decided. There is no limit to the number of substitutions for each team in the competition; Pause in the first half, each team can get 2 times; You can get 3 times in the second half; At any time in each overtime, each team may have a timeout.

  There are two kinds of violations of competition rules in basketball games: violations and fouls. Violations include: walking with the ball, illegal dribbling, punching or kicking the ball, returning the ball to the backcourt, and 3 seconds violation. In addition, it also includes the following:

  5-second violation: the attacking player must throw the foul ball within 5 seconds; Or when being closely defended, you must pass, throw or dribble within 5 seconds; When the referee hands the ball to the penalty player, the player must make a shot within 5 seconds.


  8-second violation: A team must make the ball enter the frontcourt (the opponent’s half) within 8 seconds from controlling the live ball in the backcourt.

  24-second violation: Every time a player gets a live ball on the court, the team must try to shoot within 24 seconds.

  Interference score: When the ball shot (free throw) falls in flight and is completely above the level of the hoop, the players of both sides must not touch the ball. When the shot ball touches the rim, neither team member can touch the rim or backboard, reach through the rim from below and touch the ball, and shake the backboard and the rim. If the attacker violates this rule, the basket will be invalid, and the ball will be awarded to the other side to throw the ball out of bounds in the extension of the free throw line; If the defender violates this rule, regardless of whether he hits the ball or not, the shooter (free throw) will be awarded points.

  Fouls include the following situations:

  1. personal foul: If a player who didn’t shoot is fouled, the non-foul team will throw the ball into the foul area near the foul place to restart the game. If the foul team is in the state of team foul punishment, it should be awarded two free throws to the players who have not shot, instead of throwing the ball into the bounds. If a player who is making a shooting action is fouled, if the shooting is successful, points shall be counted and an additional free throw shall be awarded; If you miss the shot, you will be awarded 2 or 3 free throws according to the location of the shot.

  2. Technical foul: it is a non-contact foul, such as ignoring the referee’s warning; Violate the referee, technical representative, record desk personnel or team seat personnel impolitely; Use language and manners that offend or incite the audience; Teasing the opponent’s team members or shaking hands near the eyes of the opponent’s team members will hinder their vision; Deliberately touching the ball after it passes through the basket to delay the game; Obstruct the rapid execution of throwing the ball into bounds to delay the game; Fake a fall to fake a foul, etc. The penalty for the technical foul is to award the opponent two free throws, and then throw the ball into the boundary at the extension of the center line opposite the recording table.

  3. Foul against sportsmanship: A player is not legally trying to grab the ball directly within the scope stipulated by the rules, and the contact foul is a violation of sportsmanship. After the foul, the opponent will be awarded a free throw, and then the ball will be thrown into the line at the extension of the center line opposite the recording table. If a player fails to make a shot, he should be awarded two free throws; A foul on a player who is shooting a basket, such as a middle basket, should be scored and awarded a free throw. If you don’t hit the basket; Two or three free throws should be awarded.


  Notes for watching the game:

  As the host, every spectator who enters the stadium to watch the game should watch the game in a civilized way and forbid vulgar words and deeds. Specific attention should be paid to the following points:

  (1) Visitors should enter and leave the venue in an orderly manner, and only bring soft-packed drinks into the stadium. Don’t sit on the steps of the passage when watching the game.

  (2) The audience should not smoke after entering the gymnasium; Don’t walk around at will during the game; The mobile phone should be turned off or set in vibration and mute state. You can’t use the flash at will, especially when the players perform free throws.

  (3) When the host introduces the players from both sides one by one, the audience should applaud each player. When the national flag of the participating countries is raised and the national anthem of the participating countries is played, the audience should stand up and pay attention.

  (4) Don’t use language that infringes on the opposing team in the game, applaud the wonderful performances of both sides, and don’t use boos to influence the game and suppress opponents; Don’t use provocative body language.

Editor: Qian Ruibin

Bai Yansong: Are soccer and soccer the same sport in China?

On July 19th, Bai Yansong paid attention to the "football road, how should China go?" in CCTV’s "News 1+1" program. Among them, the golden sentence is constant. Some words may sound a little harsh, but we can understand the helplessness of many experienced fans who can only have fun in the midst of years of pursuing love and constant loss. The so-called "love is deep and responsibility is urgent".

Let’s listen to what Yansong said ~

"I don’t want to talk about China football and everyone laughs."

When it comes to football in China, everyone will be happy and tell many jokes. In fact, I don’t want everyone to laugh when talking about China football, but China football has tortured fans for so many years, and I think we have some capital to laugh now. What can we do if we don’t smile?

But we really don’t want to laugh. We really want China football to develop better. But how to develop?

"How can China football develop without a stadium and a good coach?"

There is a survey: What do you think is the most important thing for China football to be strong? I think two figures are too low: 3% people choose.Build more stadiums, and 3% of people choose.Training of grass-roots coachesThis ratio is too low.

Let’s take a look at the goal of China Football Association: to expand the training scale of coaches year by year. By 2020, the total number of certified coaches in China will reach 70,000. Note that it is to strive to achieve it by 2020, which is quite different from the fact that 100 children in Iceland may have a good coach to take care of them.

There are also people who study football in China now, but after graduating in four years, they can’t get a certificate, and then they may be assigned to a school and stop teaching football and become ordinary physical education teachers.

Without a stadium and a good coach, it is almost impossible to make football in China the same sport as football.

"Playing football well has nothing to do with the population."

I often hear people in China say that 1.4 billion people can’t find 11 players. The four most populous countries in the world rank first in China, second in India, third in the United States and fourth in Indonesia. Except for the United States, which often enters the World Cup, the remaining three countries are not good at playing football, so it has nothing to do with the population.

What does that have to do with anything? CCTV 5, the sports channel, made a 20-episode feature film called Football Road before the World Cup. Frankly speaking, after the World Cup, I watched it again, and I saw that my blood was boiling and I often became very quiet. How about football in China? Is China football and football a sport after all, and how can they become the same sport?

"The goal of the national team competition in 2018 has almost not been completed."

Next, let’s look at the goals of the national team. The Chinese Football Association’s Action Plan for 2020 has drawn up three goals for the national team in 2018:

The goal of FIFA U20 World Cup was to strive to participate, but I didn’t go.;

FIFA U17′ s goal was to compete, but it didn’t go.;

The goal of U23 Asian Championship was to enter the top eight, but failed.!

In other words, the goal of the 2018 competition was almost not completed. The goal of the 2019 competition is to enter the top four of the Asian Cup. Can it be completed? Frankly, I’m not optimistic.

"We don’t want to be people who tell jokes about China football."

I really hope that all football players in China can take a good look at the 20 episodes of Football Road on Sports Channel. After reading it, we will all be the beneficiaries. We don’t want to be people who tell jokes about football in China. Frankly speaking, how lively the World Cup is, we are just passers-by, just a group of spectators. Only when China football is really well done and China football and football become the same sport, will we be really happy.

Want to see more suggestions from Bai Yansong about the development of football in China, click to watch the full video ↓↓↓

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Today’s SMG football recommendation: How to use ChatGPT to balance the director: Las Palmas vs Atletico Madrid

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In football analysis, no one can guarantee a 100% winning rate. However, AI can increase its chances of winning by continuous learning, improvement and adaptation. Focus on long-term analysis strategies and treat every decision with a steady and firm attitude.

Last day! When the annual tax settlement ends, the tax refund will be wasted if it is not received.

  Beijing, China, June 30 (Reporter Li Jinlei) On June 30, it was the last day of the annual calculation of comprehensive income of individual tax in 2019. If you don’t apply for tax refund, you should pay close attention to it, otherwise it will be wasted if you don’t get it. Those who have not paid the overdue tax should also pay close attention to it, otherwise they will face fines and late fees, which will also affect their personal credit.

  Last day of annual tax settlement

  The annual remittance of comprehensive income from individual tax in 2019 will be handled from March 1 to June 30, 2020. June 30th is the last day for annual settlement.

  The so-called annual tax calculation is to "combine the annual income and calculate the tax on an annual basis", and then refund more and make up less. That is to say, the four incomes of wages and salaries, labor remuneration, manuscript remuneration and royalties are combined into "comprehensive income", and the individual tax is calculated on an annual basis.

  The specific calculation formula is as follows:

  In 2019, the tax payable or refundable is calculated = [(comprehensive income-60,000 yuan-special deductions such as "three insurances and one gold"-special additional deductions such as children’s education-other deductions determined according to law-donation) × applicable tax rate-quick deduction]-prepaid tax in 2019

  Personal income tax rate table.

  If you don’t get a tax refund, you’ll be wasted.

  Who can get a tax refund? As long as you pay more taxes in advance because of insufficient deduction or undeclared deduction, taxpayers can apply for tax refund regardless of their income or the amount of tax refund.

  For example, your comprehensive annual income in 2019 is less than 60,000 yuan, but your income is relatively high in a certain month, and you can get a tax refund if you pay a tax in advance.

  For example, Xiao Ming received a salary of 10,000 yuan in January, and an individual paid "three insurances and one gold" of 2,000 yuan. Assuming there is no special additional deduction, he will pay a tax 90 yuan in advance; In other months, the monthly salary is 4000 yuan, and there is no need to pay taxes in advance. Throughout the year, because taxpayers’ annual income is less than 60,000 yuan, they don’t need to pay taxes, so they can apply for a refund of 90 yuan tax paid in advance.

  For another example, if you didn’t declare to enjoy the six new special additional deductions (children’s education, continuing education, serious illness medical care, housing loan interest or housing rent, and supporting the elderly) in 2019, you may also get a tax refund after the declaration.

  For example, Lao Wang’s monthly salary is 10,000 yuan, and the individual pays 2,000 yuan for "three insurances and one gold". According to the regulations, two children who go to primary school can enjoy a special additional deduction of 2,000 yuan per month (24,000 yuan for the whole year). However, because it was not reported in the prepayment link, the special additional deduction for children’s education was not deducted when calculating the tax, and the tax was paid in advance for 1080 yuan in the whole year. After filling in the relevant information in the annual settlement, it can supplement and deduct 24,000 yuan. After deduction, it should pay a tax of 360 yuan for the whole year, and it can apply for tax refund in 720 yuan according to regulations.

  If you can get a tax refund, but you don’t declare it, the money will be wasted. Of course, it should be noted that the tax refund can be waived without any responsibility.

  Screenshot of tax refund received by netizens in Weibo.

  Failure to pay taxes will result in fines and late fees.

  Although the tax refund can be waived, the tax payment cannot be waived. If you need to pay back taxes, you must make an annual settlement.

  Who needs to pay taxes? That is to say, taxpayers whose comprehensive annual income exceeds 120,000 yuan and whose annual amount of supplementary tax is above 400 yuan need to pay supplementary tax.

  There may be small partners who see that they have to pay taxes and want to ignore them. However, this kind of escape mentality is not desirable. If the tax is not paid on time, the consequences will be more serious. Don’t be fined, and you will have to pay a late fee, which will affect your personal credit.

  State Taxation Administration of The People’s Republic of China said, if you should pay taxes, it is your obligation to handle the annual remittance. If you don’t pay the tax, you may face tax administrative punishment and record it in your personal tax credit file.

  According to Article 62 of the Tax Administration Law, if a taxpayer fails to file tax returns and submit tax information within the prescribed time limit, the tax authorities shall order it to make corrections within a time limit and may impose a fine of less than 2,000 yuan; If the circumstances are serious, a fine of not less than 2,000 yuan but not more than 10,000 yuan may be imposed, and taxes shall be recovered and late fees shall be imposed. For late payment fees, from the date when the payment deadline is exceeded, five ten thousandths of the overdue tax will be charged on a daily basis.

  Tax data map. Zhongxin. com reporter Li Jinlei

  Don’t trust the so-called "secret" of tax refund

  In the process of annual tax settlement, some people are unwilling to see that others can get a tax refund, but their own tax refund amount is 0, so they make a bad idea, believe in the "tax refund strategy" and "tax refund tips" circulating on the Internet, and make a false declaration.

  A case published by Zhejiang Taxation Bureau shows that taxpayer Zhang, according to the system trial calculation, should get a tax refund in 0 yuan, but he applied for a tax refund of 202.12 yuan by falsely reporting the special additional deduction for his serious illness medical treatment in 2019. In the daily monitoring, the tax department found that Zhang’s special additional deduction data was doubtful, and contacted Zhang for verification, requesting relevant retained information, but Zhang could not provide it. In the end, the tax department informed Zhang of the legal responsibility for not submitting the special additional deduction information truthfully, and advised Zhang to correct the declaration in time.

  The tax department reminds that taxpayers need to declare the annual tax refund, and individuals should be responsible for the authenticity, accuracy and completeness of the declared information. Don’t believe in the so-called "tax refund tips" passed on the Internet and orally, so as to avoid false declarations or false declarations that violate the provisions of the tax law.

  Have you settled the annual tax? Is it a tax refund or a tax payment? (End)

Surprised! What is the principle that chewing gum can open coconuts?

 one

 Can chewing gum really open coconuts by rubbing it into a cone? (Video screenshot)

  The scorching summer is a good time to drink coconut milk and eat coconut meat. Here is an interesting question: If you only have durian, rubber band and chewing gum at hand, which one do you think you can choose to open a coconut quickly?

  You may not imagine that researchers will tell you that opening coconuts with chewing gum is one of the simplest and most feasible methods.

  If you want to know the principle, you need to know all kinds of substances of non-Newtonian fluid and Newtonian fluid.

  Inflatable fluid: eat soft but not hard

  — — Chewing gum, starch solution, wet sand on the beach and concrete slurry belong to expansive fluids.

  What is the correct posture to open coconuts with chewing gum?

  First, knead a few pieces of chewing gum into a cone, then put the tip up and the bottom flat on the table, then hold the coconut to a certain height with your hands and hit it hard on the chewing gum. We will find that chewing gum will not be smashed flat, but will break a hole in the coconut. Repeat this several times, and the coconut can be broken.

  Why on earth does chewing gum have such magical power? In fact, the principle is — — Non-newtonian fluid principle. There is a gum-based component in chewing gum, which belongs to the shear thickening fluid in non-Newtonian fluid. The viscosity of this fluid will increase under the action of a large external force, and the greater the external force, the greater the viscosity.

  When the coconut hits the chewing gum at high speed, the viscosity of the chewing gum increases rapidly, and at this time it behaves as hard as a solid, thus piercing the hard shell of the coconut. Once the external force is withdrawn, it will return to the nature of liquid. If the external force is small and slow, it will behave like an ordinary liquid with fluidity. It’s really a soft guy.

  When this fluid thickens, its volume will expand slightly, so the shear thickening fluid is also called expansive fluid. Starch solution, wet sand on the beach and concrete slurry all belong to this kind of fluid.

  The change of viscosity of expansive fluid is related to its internal structure. That is, when shear thickening occurs, a certain structure is formed inside the fluid.

  Expansive fluid is usually a multiphase mixture, such as wet sand on the beach, which is a mixture of sand and water. When there is no external force or the external force is very small, the irregular sand grains are densely packed, and water can be evenly filled in the gaps between the sand grains to play the role of lubricant. When someone steps on the sand, the original tightly packed structure is destroyed, and the "dislocation" between the sand grains will increase the volume; At the same time, the water is forced to move around, and the flow is disordered, and the resistance will increase, and the flow of sand is more difficult because of the loss of lubricant. Therefore, the sand surface infiltrated by seawater on the beach is easier to walk than dry sand, because this characteristic of wet sand will make our feet less prone to sink.

  Bingham fluid: sometimes like a solid, sometimes like a liquid.

  — — Toothpaste, facial cleanser and hand cream belong to Bingham fluid.

  Since there is non-Newtonian fluid, there must be Newtonian fluid. Fluids whose shear stress and shear rate conform to Newtonian fluid formula belong to Newtonian fluid. Water and air are Newtonian fluids, and their shear stress is directly proportional to the shear rate.

  Any fluid whose shear force and shear rate do not conform to Newtonian fluid formula is called non-Newtonian fluid. Besides expansive fluid, non-Newtonian fluid also includes pseudoplastic fluid and Bingham fluid. All kinds of sauces, oils, polymer solutions, mud in the kitchen, and even blood and cell fluids in organisms are non-Newtonian fluids.

  The shear stress and shear rate of Bingham fluid are also linear, but unlike Newtonian fluid, it has a yield stress, and it will flow only when the external force is greater than the yield stress.

  The most typical Bingham fluid is toothpaste. When there is no external force, it looks like a solid. Only when we squeeze toothpaste hard, it will "flow" out of the tube, and when it is squeezed into the toothbrush, it can still maintain a certain shape without "falling down". If you don’t squeeze it, it won’t come out even if you turn the toothpaste tube upside down.

  Similarly, we can infer that things like facial cleanser and hand cream are also Bingham fluids. The paint used in buildings also needs to be designed as Bingham fluid. We require that it can flow when mixing and painting, and at the same time, it will not flow down from the wall because of gravity after being painted on the wall, that is to say, the yield stress of the paint should be greater than its own gravity.

  Like expansive fluid, Bingham fluid is a multiphase mixture. It is generally believed that the fillers in Bingham fluid form a three-dimensional network structure, which has certain strength and can resist low external forces; When the external force is large enough, the three-dimensional structure is destroyed and the filler will flow with the solvent.

  Pseudoplastic fluid: bullying the weak and fearing the hard.

  — — Blood, magma, yogurt, tomato sauce and shampoo are pseudoplastic fluids.

  If expansive fluid is soft and hard, then pseudoplastic fluid is a bully. Pseudo-plastic fluid shows the opposite properties to dilatant fluid, and its viscosity remains constant at low shear rate, but decreases with the increase of shear rate. That is to say, the greater the external force applied to it, the smaller the viscosity it shows. So it is also called shear thinning fluid.

  Many polymer liquids belong to this kind of fluid. The viscosity of a fluid can be understood as the friction between molecules in the fluid, and the greater the friction, the greater the viscosity. Solute in polymer liquid is a kind of molecule with large molecular mass and long structure. Without external force, they are usually in a curled state, and the molecules may entangle and collide with each other, resulting in high friction. When there is an external force, the curled molecules will spread along the direction of shear force, and the molecules will be arranged in parallel, so the friction between them will be reduced, and thus the viscosity will be reduced.

  Blood, magma, yogurt, tomato sauce and shampoo all belong to pseudoplastic fluids. When we stir yogurt or tomato sauce slowly, we will find it more difficult, but when we stir it quickly, it will be easier. In fact, this is the reason above.

  Pseudoplastic fluid has another interesting phenomenon — — Kay effect. When a beam of pseudoplastic fluid with high viscosity hits a solid surface, the solid surface will bounce the liquid beam back upward.

  Observing the experimental phenomenon carefully, it is not difficult to find that a layer of fluid always accumulates below the rebounding water flow. Combined with the properties of pseudoplastic fluid, the whole process should be like this: the rapidly falling liquid jet impacts the viscous fluid pile below, and the viscosity of the fluid surface becomes smaller due to the impact force, forming a dimple-shaped pit after the impact. At the same time, the surface with reduced viscosity acts as a lubricant, and finally the falling liquid jet is bounced out.

  (Cai Dongmin)

Before taking antibiotics, ask the doctor these 12 questions.

  Before you leave the doctor’s office or pharmacy, getting the answers to the following questions can make the antibiotics you take as effective as possible.

  Why should I take this medicine?

  Norman Tomaka, a spokesman for the American Pharmacists Association, believes that every patient should confirm and understand why doctors prescribe antibiotics for them. According to the research results published in the journal of the American Medical Association by researchers from the US Centers for Disease Control and Prevention, from 2010 to 2011, nearly one-third of oral antibiotic treatment prescriptions in the United States were wrongly prescribed by doctors. Taking unnecessary antibiotics will make bacteria resistant to drugs, so have an open discussion with your doctor to make sure your prescription is the best choice.

  When should I take the medicine?

  Antibiotics have to reach a certain concentration in the blood to take effect, so take the medicine on time. Taking medicine when you wake up in the morning, before lunch and before going to sleep can ensure that you will not forget to take medicine to the greatest extent.

  Can antibiotics be taken with food?

  Eating while taking medicine will affect the way drugs are absorbed in the body, but it can also prevent nausea caused by drugs that may irritate the stomach. If the drug instructions state that you should take it on an empty stomach, follow the instructions, because food may hinder the absorption of the drug in the blood.

  Do you want to avoid eating certain foods when taking medicine?

  Some drugs may have adverse reactions to certain foods. For example, dairy products will reduce the efficacy of tetracycline, because calcium in food combines with antibiotics, resulting in a decrease in the body’s absorption. Make sure you are aware of any food that may hinder your recovery.

  Do you want to drink a large glass of water when taking the medicine?

  Water can dilute the contents of the stomach and help you absorb the effective components of antibiotics before the stomach is stimulated. While drinking enough water can help prevent nausea caused by most drugs, some antibiotics need to drink a whole glass of water to be completely absorbed. Antibiotics in capsule form can prevent it from being dissolved prematurely until it enters the stomach; Drinking more water will help these antibiotics to be completely absorbed.

  6 Do you want to eat probiotics while taking antibiotics?

  Not all bacteria in your body will make you sick. Some bacteria in your stomach are essential to keep your intestines or reproductive system healthy. However, antibiotics do not know which bacteria are good and which bacteria are bad; They will kill all bacteria, including those that are good for human health. When drugs attack good bacteria, you may have gastrointestinal discomfort, urinary tract infection or yeast infection. To prevent these side effects, the doctor may suggest that you eat yogurt rich in probiotics or take probiotic supplements.

  7 what should I do if I miss the medicine?

  Theoretically speaking, there is a fixed time interval for each medication. In real life, you may forget to take the medicine or take it late. If you miss the medication time, it’s important to know what to do in advance, so that you won’t look around for information in the dead of night. Some drugs should be taken in time after missing the correct time, while others should be taken normally next time when they are forgotten, so read the drug instructions carefully.

  When should I feel better after taking medicine?

  You should take the medicine completely as long as the doctor prescribes it, instead of stopping taking it once the symptoms disappear, because the bacteria in your body may still be at an unsafe level. However, it is important to know how soon you can recover. Generally speaking, if you don’t get better after taking the medicine for three days, you need to see a doctor again, because at this time, either the drug choice is incorrect or something else has happened.

  9 What side effects are expected from the antibiotics I take?

  Although only a small proportion of people have side effects after taking antibiotics, you need to know what adverse reactions your body will have. Some drugs may cause shortness of breath, while others may cause urticaria. If there are suspected side effects, you should consult your doctor whether to continue treatment or switch to another treatment.

  Can I crush the pills?

  If you have difficulty swallowing pills, consult your doctor before you plan to crush them, because antibiotics in pill form are absorbed in a different way from capsules. Some antibiotics are made in liquid form, which may be a better choice for some patients.

  Will this antibiotic interact with other drugs I take?

  The doctor may ask you what other drugs you have taken to avoid adverse reactions, but don’t forget birth control pills or over-the-counter supplements and vitamins easily. Some antibiotics may reduce the contraceptive effect, which means you may need to take another contraceptive method. In addition, iron-containing supplements combine with some antibiotics, making the latter unable to be absorbed.

  What should I do if I have a history of antibiotic allergy?

  Being allergic to an antibiotic not only means that you must avoid this drug, but also beware of other related drugs belonging to the same family. Therefore, after taking the medicine, you should observe it carefully, stop taking it immediately and ask the doctor for help if there is an allergic reaction. (Compile/Guo Shaofeng)

Can you tell these derivative models of the F-35 from the "Lightning II" family?

  According to the report of Flight International on April 16th, the US Navy and Marine Corps successfully completed the first test of the concept of "lightning carrier". Twenty F-35B fighters with short take-off and vertical landing took off from the US Navy "Tripoli" amphibious assault ship to perform fast-paced operations.

  The concept of "Lightning Carrier" was formally put forward in 2016, based on the existing "F-35B vertical takeoff and landing aircraft+amphibious assault ship" model of the US military. The name of "Lightning" in the concept comes from the F-35B Lightning II Joint Strike Fighter, and F-35B is just one of the F-35 Lightning II Joint Strike Fighter (JSF) models.

  F-35 "Lightning II" Joint Strike Fighter (JSF) is a single-seat single-engine multi-role fighter and a low-order auxiliary aircraft of F-22. It has strong stealth capability, advanced avionics system and certain supersonic cruise capability, and is mainly used for frontline support, target bombing, air defense interception and other tasks. It is divided into three types: conventional takeoff and landing (CTOL)F-35A, short takeoff/vertical landing (STOVL)F-35B and carrier-based (CV)F-35C. Undoubtedly, in the future competition for air superiority, F-35, as one of the world’s advanced fifth-generation aircraft, has a very high photogenic rate. So how do you distinguish them in appearance?

  one

  plane emblem/logo

  The F-35 "Lightning II" Joint Strike Fighter (JSF) was mainly developed by Lockheed Martin of the United States, and eight countries including Britain, Italy, Netherlands, Denmark, Norway, Turkey, Australia and Canada participated in the development, with a total cost of $276 billion.

  In addition to R&D abroad, South Korea, Japan and Israel also vigorously purchased the F-35 to enhance the overall air combat capability. Therefore, according to the current data, a total of 12 countries have decided to equip the F-35:

  According to the above picture, there is Israel’s Star of David emblem above the wing, which is an F-35A. (Architecture A, called F-35I, shows the F-35A fighter equipped by Israel Air Force. )

  two

  character

  The U.S. Air Force, Navy and Marine Corps are equipped with three types of F-35 fighters, which are not a panacea according to their badges. If it is an F-35 equipped by the US military itself, it can be roughly distinguished by the characters in the belly position below the horizontal tail:

  1. Symbol of the United States Air Force (F-35A of the United States Air Force)

  2.NAVY (F-35C of the US Navy)

  3.MARINES (The United States Marine Corps purchased two models, F-35B and F-35C).

  In addition, there are several F-35Cs in the US Navy that also say "MARINES". But what should I do if I can’t see the military emblem or characters from the photo point of view? This uses the "shape resolution method".

  three

  wing span

  Both F-35A and F-35B have a wingspan of 10.7 meters, while F-35C adopts a large wingspan design to reduce the landing speed, and the wingspan is increased to 13.1 meters and can be folded, which is the largest of the three sub-models.

  four

  nose gear

  In order to withstand the impact of the ship, the F-35C has thickened the front landing gear, and changed from the basic single-wheel landing gear to the two-wheel landing gear, and the front landing gear has the unique ejection pull rod of the ejection take-off fighter. The following figure shows F-35A, F-35B and F-35C in turn.

  five

  Landing tail hook

  The landing of the F-35C needs to be stopped, and a repeatedly used stern hook is equipped under the engine. Although the F-35A will also be equipped with crash landing tail hook, it is currently testing the tail hook crash landing, and even if it is installed, it will be one-off.

  six

  regula

  The leading edge of the main wing of the F-35C is moved forward to increase the wing area, which leads to the strake wing in both the F-35A and the F-35B, but it is cancelled on the F-35C. The following figure shows F-35A, F-35B and F-35C in turn.

  seven

  Jibei

  F-35B is a short takeoff/vertical takeoff and landing type. Due to the special requirements of takeoff and landing mode, the engine of this type adopts a lift fan device. When viewed from the top, the rear of the cockpit is flat, and the upper cover of the lift fan and the cover plate of the auxiliary air inlet will open upward during the takeoff and landing.

  eight

  Machine gun

  The F-35A is the only one of the three sub-models, which adopts the built-in gun design and is equipped with a GAU-22/A four-tube 25mm gatling built-in gun. Therefore, there is an obvious protrusion on the front upper part of the left wing of the fuselage, which is a remarkable feature of the A-type aircraft. F-35B and F-35C are not equipped with fixed cannon, so it is enough to mount the cannon pod on the belly line when necessary.

  nine

  Verifier, test aircraft and

  Low speed initial production aircraft

  The test aircraft and the initial low-speed production F-35 are usually numbered on the fuselage. For example, before the mass production of the F-35A, the aircraft fuselage numbers AA-01, AF-01 to AF-07 were even directly marked with F-35A, all of which contained "A"; F-35B has BF-01 to BF-04 with "B" in them; F-35C has CF-01 to CF-05 before the first mass-produced CF-06, all with "C".

Does domestic OA software enter the 3.0 era? Huatian Power OA system has already released its 4.0 advantage.

OA office system plays an important role in modern enterprise operation. With the change of market and the diversification of office demand, OA office system is facing the challenge of experience upgrade. Insiders pointed out that the domestic OA software industry has now entered the 3.0 era, and OA vendors are "shuffling" in the fierce competition. However, market observation found that the requirements for OA software in the 3.0 era are not high, and brands such as Huatian Power have already released the advantages of 4.0.
3.0 era cooperated with OA to realize the integration of technology and demand.
"The OA system in the period of 1.0 is only a concept, mainly based on the application of reports and documents. In those years of 2.0, the OA system solved the basic cooperative office problems of enterprises. Nowadays, in the era of 3.0, multi-party system integration and data fusion are pursued, and the mobile office mode is realized. The pressure on manufacturers is not small, and a large number of cooperative management OA system brands at the low end of technology will be eliminated in the process."
The opinions of the insiders have been affirmed by some people, and it can be seen that the popular collaborative management OA system brand has indeed reached the 3.0 standard. Taking Huatian Power Collaborative OA System as an example, the system uses EAI technology to establish application interface layer, application integration layer, process integration layer and user interaction layer. When a document is filled in the collaborative management OA system, it will automatically flow to the ERP system to extract the required data, and then it will be approved in the collaborative management OA system, and then it will flow to the ERP system for processing, thus realizing data integration with CRM, ERP, HRM, SCM and financial software.
However, as far as Huatian Power Collaborative OA system is concerned, the requirement of collaborative management OA system in the 3.0 era is not a challenge. The system allows users to upgrade their software systems independently and flexibly, and at the same time, obtaining service guarantee is the key to breakthrough development.
Huatian Power Collaborative OA System Releases the Efficiency of 4.0 Era
Huatian Power OA believes that whether it is big data or cloud office, for operators, these interconnected technologies support office efficiency, but the enterprise user experience lies in whether a set of collaborative management OA system can be used for a long time at a reasonable or even reduced cost, which requires the flexibility and independent upgrading strength of collaborative management OA system.
"Huatian Power Collaborative OA System is currently able to surpass the above-mentioned experience needs of the 3.0 era system."
Huatian Power Collaborative OA System adopts J2EE+SOA+MVC+WebService technology, and forms "Rubik’s Cube Architecture" with framework+component system. Users can build personalized business modules by themselves, realize dynamic deployment, upgrade and expansion without code-level operation, and realize on-demand management.
In addition, the pages developed by Huatian Power Collaborative OA System based on interfaces are separated from the complex page logic of the old framework by refining the interfaces, and the calling relationship between each page module is well sorted out, which combines the approval process with the process management. It is an open business modeling tool and realizes the unified management and continuous optimization of office processes and business processes.
Huatian Power goes deep into service to enhance user experience.
Consumption upgrading is being reflected in all walks of life, and users are pursuing consumption quality, which also means that product quality is guaranteed and services should be in place in time. In this regard, Huatian Power, which entered the 4.0 era, made in-depth innovation in service.
Among the specific services, Huatian Power provides "six service contents", such as customized service, which can analyze the logical changes of data according to the specific office mode of customers and help users organize them into practical, personal and low-cost solutions for free; And "upgrade service" is the advanced product that Huatian Power and OA system can achieve, so that customers can enjoy the upgraded service with the system upgrade; Other services such as "secondary development", "consultation" and "tracking" are all aimed at ensuring the in-depth service of users, so that the collaborative management OA system project application can really land. If there is still demand, Huatian Power can cooperate with users at a higher level, not only becoming a supplier of customers, but also becoming a strategic partner that customers can trust.
It is not difficult to see that Huatian Power Collaborative OA not only meets the system standards of the 3.0 era, but also has gradually released the office efficiency of the 4.0 era from the aspects of operation upgrade and service experience, and users have the right to speak in their own upgrade operations. Perhaps this is the important reason why Huatian Power Collaborative OA has been favored by enterprise users in recent years.
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