Into Unscientific Chapter 683

"What?"

 Inside the base office.

Hearing what Xu Yun said.

Li Jue subconsciously stood up from his chair and stared at Xu Yun:

“Xiao Xu, can you buy meat from abroad?”

Xu Yun nodded slightly when he heard this. He had actually considered this plan a long time ago:

"Well, I'm quite confident - but the meat obtained through this method can only be used to make dumplings at our base, and it can only be done once."

“Imagining the long-term and huge quantity of winter wheat traded with Mao Xiong. This is completely impossible.”

 Xu Yun is telling the truth.

In a sense, CocCola is a unique product. Its position in the bear trade is irreplaceable and irreproducible. Even if Xu Yun wants to come up with a similar product, there is no possibility.

 So his goal this time is very clear, which is to prepare enough meat for the New Year's Eve dinner.

 “It doesn't matter if it's only once!”

Hearing this, Li Jue quickly waved his hand vigorously and said:

“Xiao Xu, as long as we don't use our domestic reserve meat, you can do whatever you want with this New Year's Eve dinner!”

Xu Yun's expression relaxed slightly:

“Director, can you guarantee that the meat will not be picked?”

 It is relatively rare for academics to pick peaches in China these days, but such operations as material interception often happen.

Moreover, the interception of materials during this period was basically related to words such as favor and friendship, which is a bit similar to the way the brigade commander managed Li Yunlong's cavalry battalion in "Bright Sword" - "We are all so familiar, is it okay to get something from you?" ? 】

This kind of thing related to friendship is more complicated than official interception, especially for a big boss like Li Jue who has complicated relationships in the army. Xu Yun doubts whether fifty cows will be left when they are delivered to the base. Five cows.

But what made Xu Yun relieved again was.

Li Jue nodded vigorously again, and moved his chin toward Lao Guo:

“Don't worry, if you can really get beef and mutton from abroad, I'll ask Lao Guo and the Fifth Division to come forward and use the relationship between the Academy of Sciences to procure the meat.”

“As long as the meat you bring back can pass the customs security inspection, I guarantee that not even one piece of beef will be missing when it is delivered to the base!”

Xu Yun:

 Then Li Jue paused and asked Xu Yun:

“Xiao Xu, you don't have to worry about picking peaches. The key to this is actually.”

“Who are you going to do this business with? The furry bear? Europe? Or across the sea?”

“And what are you going to use to convince them? It can't be Coke again, right?”

Facing a series of questions from Li Jue, Xu Yun shook his head slightly:

“Director, I don't want to do business with Mao Xiong or Europe this time. I plan to change the target pit. Ahem, change the target transaction.”

“Actually speaking of beef, factory director, we have a neighbor next door who is very knowledgeable in the field of beef.”

"Neighbor?"

Li Jue was stunned for two seconds, and then he thought of something:

“Xiao Xu, are you talking about neon?”

Xu Yun chuckled twice, and an inexplicable brilliance flashed in his eyes:

 “That's right, it's neon!”

 It is well known.

As a well-known island country, Neon's terrain is dominated by mountains and hills, with maritime climate characteristics and a warm and humid climate.

 In addition, there are many volcanoes in the country, the soil is fertile, and the domestic vegetation coverage rate is as high as 60%, so it is a natural beef breeding country.

 Probably after the Meiji era.

  Neon is a breed of native cattle that has been mated with foreign cattle to give birth to four types of cattle, namely black Wagyu, brown Wagyu, neon hornless cattle and neon hornless cattle.

 These four types of mixed-breed cattle are what later generations call "Wagyu".

Of course.

At this time, the Wagyu breeding industry chain is not as complicated as that of later generations. At the same time, Neon has not carried out large-scale hunger marketing of Wagyu. Therefore, the "Wagyu" of Neon today is still obviously different from the Shuangjiang 5A Wagyu of later generations. difference.

 The characteristic of Neon Wagyu during this period is that it has a lot of fat. Neon's annual domestic beef cattle production is about 70,000 head.

  More importantly.

  The main reason why China banned the import of neon beef for a long time was the outbreak of mad cow disease in 2001:

At that time, all cattle-raising countries in the world except Australia and New Zealand were affected by mad cow disease. In 2003, Neon banned the import of feed from across the sea because it was common to crush beef bones and add them to feed across the sea. Later, It is also considered to be an important cause of mad cow disease in cattle.

Even until 2023, Neon will still be a mad cow disease epidemic area.

 But it's very interesting.

In Neon's list of wagyu exporting countries, Cambodia has ranked first for seven consecutive years. This is worth pondering—are these wagyu beef really eaten by Cambodians?

 Ahem

Looking back to reality.

Although mad cow disease was considered a serious disease in later generations (how strange is this sentence), Neon's beef is still quite safe at this time.

And the fat of Neon beef is not greasy at all to the current base employees. If we can really get a batch of beef from Neon.

Think of this.

Li Jue couldn't help but lick the corner of his mouth and asked Xu Yun:

“Xiao Xu, what are you going to trade with Neon Man for beef?”

 Then without waiting for Xu Yun to answer, Li Jue added:

“By the way, if it is some technology that is more important or helpful to Neon people, I advise you to think about it first.”

 Lao Guo on the side also nodded in agreement. He also had the same idea.

Although the New Year's Eve dinner for base employees is very important, if some important technologies are used because of this meal, then it will be a bit outweighed by the gain.

Lao Guo and Li Jue are not actually worried about Xu Yun's consciousness, but they have never been worried about Xu Yun's values ​​​​or cognitive outlook - they are afraid that Xu Yun will throw away certain technologies if he thinks they have little value in the future. Went out for a meal.

Facing Li Jue's concerns, Xu Yun shook his head:

“Director, don't worry, what I gave Neon people this time is not an important technology.”

“On the contrary, if they are not careful, they may even fall over.”

 “Stumbling?”

Hearing these three words, before Li Jue could react, Lao Guo understood Xu Yun's meaning first:

“Xiao Xu, are you going to dig a hole for the Neon Man?”

Xu Yun nodded heavily, and then feared that Lao Guo and the others would not be willing to do such a thing, so he added a special sentence:

“Guo Gong, those Neon people deserve this. I'm just going to pay them back for the way they tricked us.”

 Lao Guo suddenly raised his eyebrows.

Xu Yun, there is something in his words.

 Then he thought for a few seconds and asked Xu Yun:

“Xiao Xu, what are you going to trade with the Neon Man?”

Xu Yun glanced at him and slowly uttered a few words: "The mixing angle of neutrinos."

 Say it.

Xu Yun also had a hint of emotion in his eyes.

 Neutrino.

 This is the earliest particle that humans have come into contact with, but it is also the most mysterious particle.

 It is well known.

 Any physical phenomenon should satisfy the law of conservation of energy, momentum, and angular momentum, and nuclear reactions are no exception.

  But scientists have found that the beta decay of the atomic nucleus (releasing an electron) does not seem to meet this situation.

To explain this phenomenon, physicist Pauli proposed that the atomic nucleus also releases an uncharged particle that is difficult to detect during fission.

 This is the neutrino.

It is worth mentioning that Chinese physicist Wang Ganchang, Comrade Wang Jing who is currently tinkering with the accelerator at the base, proposed a method to detect neutrinos in 1941.

 But at that time, China was still in the midst of the Anti-Japanese War and had no experimental conditions at all.

 The neutrino was later discovered by two other American physicists and won the Nobel Prize.

Neutrinos are somewhat similar to quarks. They also have three "flavors":

 Electron neutrino, muon neutrino, tau neutrino.

They are produced in nuclear reactions involving electrons, muons, and tauons respectively, and can only react with the corresponding particles.

These three types of neutrinos can convert into each other while flying close to the speed of light. Physicists call this phenomenon neutrino oscillation.

 In the later life when Xu Yun traveled through time.

Neon's Super Kamiokande detector, China's Daya Bay Reactor, and Jinping Deep Underground Laboratory, which is the underground experimental center where Xu Yun and others verified dark matter, have been conducting neutrino-related research for a long time.

The country that has made the most achievements in neutrinos in later generations is naturally Neon. They have also won the Nobel Prize many times for their neutrino-related research.

 But what few people know is that

 During the research on terrestrial neutrinos, neon once deceived the Chinese physics community.

This pit is the mixing angle of neutrinos.

 Mentioned above.

Neutrinos have three different "flavors". Neutrinos of these three flavors can transform into each other through weak interactions with corresponding leptons. For example, antielectron neutrinos and protons undergo reverse beta decay to produce positrons and neutrons. .

But in fact.

There is another more magical way of transformation of neutrinos, which is neutrino oscillation.

This is a quantum mechanical phenomenon in which neutrinos transition between different flavors as they propagate through space.

  In 1957.

Theoretical physicist Bruno Pontikov first proposed the conjecture of neutrino oscillation, and since then a series of experiments have observed this phenomenon.

To understand the principle of neutrino oscillation, you first need to know two things:

 First, neutrinos have mass, and second, the flavor eigenstate and mass eigenstate of neutrinos are not exactly the same.

 According to the special theory of relativity, particles without mass must move at the speed of light.

If neutrinos have no mass, then they cannot change their speed and cannot oscillate.

But experimental observations show that neutrinos do have non-zero mass, even though they are very small.

 The absolute mass of neutrinos has not yet been directly measured, but their relative masses can be inferred by observing the squared difference in mass between them.

  Then it is said to be an eigenstate.

 In particle physics, eigenstate refers to the state of a physical system with a definite value on a certain observable quantity.

For example, a neutrino with a definite value e, μ or τ in the taste observable is the taste eigenstate, and a neutrino with a definite value m1, m2 or m3 in the mass observable is the mass eigenstate.

If these two eigenstates completely coincide, then there will be no neutrino oscillation.

  But in fact, these two eigenstates are connected by a unitary matrix U. This matrix is ​​called the PMNS matrix, which can describe the conversion relationship between the flavor and mass of neutrinos.

 PMNS matrix contains three mixing angles θ, θ and θ and a CP destruction phase δ to parameterize.

Mixing angle is an important physical quantity that describes the intensity of neutrino oscillation. They reflect the degree of coupling between neutrinos of different flavors.

These mixing angles cannot be predicted theoretically and can only be measured experimentally.

 In three mixing angles.

θ and θ have long been measured, and θ is the most difficult to measure because its corresponding value is very small.

 However, θ is of great significance for detecting the CP destruction phase angle δ and determining the neutrino mass order (i.e., the size relationship between the three mass eigenstates). Therefore, measuring θ is an extremely important and challenging task.

Later generations of rabbits carried out θ measurements at the Daya Bay Reactor. This was also the first international collaborative basic scientific research project with truly important international impact that the rabbits participated in since the founding of the People's Republic of China.

 The station inspection project was approved in 2006 and officially started in 2007.

However, in the first two years, the 17 sets of data provided by the Neon Super-Kamiokande Detector Laboratory, which was responsible for providing basic parameters, were all wrong.

The rabbits spent two years and about 7 million yuan (some say 15 million) for this. Although the angle of θ was accurately measured by the rabbits in the end, the price was still too high. Big.

This is not over yet.

If the timeline is pushed back 18 years from the period when Xu Yun and others were in, the Neon people would still cause trouble in the neutrino field.

At that time, a Neon man would give the rabbits a set of theoretical physics teaching books mixed with a lot of wrong knowledge, together with the [interest-free loan] at that time, on the pretext of supporting the rabbits' education.

Then the so-called [interest-free loan] due to the Plaza Accord caused the Japanese yen to more than double its value against the U.S. dollar, and coupled with the depreciation of the Chinese currency, the rabbits' actual Japanese yen debt repayment was more than double the loan.

And that set of theoretical physics teaching books misled two entire Chinese theoretical physics college students. Therefore, if you look at the educational resumes of those academicians, you will find that there has been a gap in talent in the past few years.

At that time, certain turbulent periods had ended for several years. The important reason for this talent gap was the problems with that set of physics books.

 For example, the perturbation calculation in that textbook.

The path integral in that set of textbooks is completely expanded randomly, resulting in additional interactions in the kernel term.

At that time, due to the domestic knowledge blockade, many scholars thought that this was a brand new derivation method in the world.

For another example, in order to make the functional method they invented appear reasonable, the Neon people even discussed an ordinary differential equation to obtain an approximate solution, and then compared it with the numerical solution to perform inverse deductions, creating a theoretical framework that did not exist at all. '.

 Researcher Chang Yuan from the Department of Physics of Jinling University spent five years studying this set of ordinary differential equations. After learning the truth, this matter became a pain point in his life.

 It's a coincidence.

 At that time, it was Xu Yun's old acquaintance Atsushi Suzuki who presented those textbooks to China.

The research on neutrinos in neon is still in its initial stage. Faced with this account that is only poorly understood but actually has a huge impact, how could Xu Yun not do a good calculation?

Note:

 The readership has reopened

Chapter end