Chapter 756： Foreign orders (below)

"Foreign orders?"

Guo Tailai couldn't help but wonder: "Which aspect?"

“Maybe it is high precision machining!”

Charles shrugged his shoulders and said irresponsibly: "Who knows?"

what's the situation?

Charles will inexplicably say this to himself?

"That depends on friendship."

Guo Tailai did not understand what was going on, but he still replied to Charles: "The relationship is good, or it is particularly interesting, of course, you can consider it.

If you have never dealt with it, the relationship is normal, then forget it. ”

"Well, then I will know."

Charles’s posture is obviously to find out for others.

Guo Tailai is also curious. What kind of high-precision processing needs Charles to ask if he has time?

But soon, the next day, Guo Tailai knew what was processed.

"This is Mr. Peter Baker."

Charles came to Guo Tailai with a rare German: "He is the head of a project at the Berlin Institute of Metrology in Germany."

Peter is a very standard German, shaking hands with Guo Tailai and then expressing his admiration for Guo Tailai.

"Mr. Mr! We are very impressed with your knowledge of processing."

Mr. Peter came up with a compliment.

"you flatter me!"

Guo Tailai smiled and shook hands with the other side, and was modest.

"Long story short."

Mr. Peter is a researcher at first glance. He is not very chilling. When he comes up, he goes straight to the subject: "Mr. Mr., do you know big k?"

"Big k?"

Guo Tailai wondered for a while, after a quick turn in his mind, he remembered: "International kilogram original?"

The international prototypekilogram, referred to as ipk, is generally referred to as “big k” by researchers.

In 1878, the International Bureau of Metrology produced a replica of three kilograms of the original, a platinum-rhodium alloy cylinder containing 90% platinum and 10% bismuth.

In 1889, at the 1st International Metrology Conference, it was decided to use one of the original masses closest to the original kilograms as an international kilogram original and stored in the International Bureau of Metrology.

Since then, the international kilogram (ipk) has been kept in the basement of the International Bureau of Weights and Measures (Paris).

The “big k” is kept in a triple bell jar, and there are six official replicas of the same standard of 1 kilogram.

The outermost glass cover is drawn into a semi-vacuum to prevent the ingress of air and impurities.

"Yes!"

When he heard that Guo Tailai knew the big k, Mr. Peter laughed, which saved him a lot of explanations: "The big k has some changes that we don't expect."

With Mr. Peter's explanation, Guo Tailai soon knew what had happened.

Although the International Bureau of Weights and Measures is very well preserved, the “big k” is also subject to errors due to surface adsorption and wear and scratches caused by years of use.

The responsible metrologist found that after more than one hundred years of baptism, there was a 50 microgram error between the international kilogram original and its copy.

The error of 50 micrograms has little effect on our daily life, but the impact in the field of cutting-edge technology can be great.

Therefore, one of the first tasks of the current international metrology community is to redefine the “kilogram” by using the natural constant as a benchmark.

Scientists from the German Institute of Metrology and scientists from Russia and Australia have jointly established an "Avogadro Project", hoping to create a perfect sphere composed of silicon 28, with which the mass unit "kilogram" is redefined.

The purpose of the "Avogadro Plan" is to determine the Avogadro's constant (ie the number of basic units contained in one mole of any substance) by accurately measuring how many atoms are in the "perfect silicon sphere". A new breakthrough is achieved, which in turn returns the standard of mass units "kilograms" to the definition associated with constant constants.

This "perfect silicon ball" sphere is very close to the ideal sphere, with a diameter of about 10 cm. The distance error from the center of the sphere to any point on the surface is no more than 30 millionth of a millimeter, or 0.3 nanometers.

"What do you mean, I hope I can process this silicon ball?"

After Guo Tailai listened to Mr. Peter’s description, his eyes brightened a lot.

"Yes!"

Mr. Peter nodded: "Indeed, we have separated and produced the purest silicon 28 from the centrifugal separator of the former Soviet Union's refined weapons-grade high-purity uranium, and then grown into a huge crystal through the mature equipment for the production of silicon in Germany. After six failures, two 5 kg crystal blocks were finally produced."

"It was originally planned to send these two high-purity silicon crystals to Australia in accordance with our previous plan, and to make a pair of silicon **** for a decade of optical engineers at the Australian Centre for Precision Optics (acpo)."

Mr. Peter also did not conceal their intentions: "But we have a better choice after understanding Mr. T's past.

You and acpo each make one, and finally we choose which one to use. ”

"I am very interested!"

Guo Tailai is really interested in this difficult and challenging project.

At present, Guo Tailai's processing accuracy can only reach 1 nanometer, but the surface processing ability can be less than 1 nanometer. Of course, this is also through extremely fine grinding.

Guo Tailai also wants to know how to change all the nano-robot diamonds into synthetic diamonds with exactly the same molecular weight.

"There is a very difficult place."

Mr. Peter seems to be somewhat unspeakable. Under Guo Tailai’s incomprehensible gaze, Mr. Peter said with a little embarrassment: “Our project is pure scientific research, so there is not much money, and the processing cost may not reach Mr. Standard costs."

No money and want to make something good?

Guo Tailai understands why Mr. Peter is embarrassed.

This is normal. This kind of pure theoretical definition research may not necessarily have huge funds. After all, it is also a problem to make the silicon ball pass the international metrology committee. Therefore, the investment of the institute may not be fatal. .

"I have a call."

In the face of this problem, Guo Tailai did not directly refuse, thought about it, or decided to ask.

This time Guo Tailai played the call of President Gu, and the country happened to be in the afternoon.

After self-reporting, Guo Tailai did not sell the customs. He said this Avogadro plan here and asked the school not to be interested in the project.

“Redefining kilograms?”

President Gu also knows the technology. At first glance, let Guo Tailai wait a little while, after using a landline to make a few other phone calls, he gave Guo Tai a reply: "Several professors are very interested!"

"To understanding!"

Guo Tailai knew the attitude of the school and had a bottom in mind.

When confronting Mr. Peter again, Guo Tailai also gave a clear answer: "If you allow my alma mater to join the plan, I can process one according to the price of acpo."

"No problem at all!"

Mr. Peter seems to have expected that Guo Tailai gave a positive reply on the spot: "Welcome to join Shuimu University!"