International students returning to 90

"Professor Logan took you to visit the Simpson Laboratory yesterday. The two most important project departments here are us and the Ford Center. The Department of Aeronautics and Astronautics is the main scientific research output department of the Simpson Laboratory, and the Ford Center..."

Tony shrugged, "Although there is no technical content, I have to admit that they are the main source of funding for the laboratory."

Lin Yi took off the watch in his hand, hung the coat in the closet, and carefully buttoned every button of the white lab coat.The white coat of the material science laboratory is made of a kind of fireproof material fiber, which is thicker than the lab coat of ordinary laboratories, but it does not feel heavy when worn on the body.

"There are not many formal researchers in the Department of Aeronautics and Astronautics. There are four other people besides me. Except for Walker, who is a full-time researcher, the others are all professors from Berkeley. They only come here when they are working on projects. Walker talks a lot, but he is nice. We all do our own research, and although we are in the same department, we don’t have many opportunities to get in touch with each other at work.”

While the two were talking, Professor Logan walked over with a smile, followed by He Qun with a haggard face.

"Get used to the working environment. If there's anything you're not used to, just tell me." This was obviously addressed to Lin Yi. Logan smiled kindly. With his big red down jacket, he looked like a man from childhood. Santa Claus coming out of the TV.

Tony showed obvious surprise on his face, "Professor Logan?"

"Professor, you are welcome. This place is very nice, and there is nothing I am not used to." Lin Yi replied politely, with a just right smile on his face.

"That's good." Logan nodded with a smile, stepped forward and patted Lin Yi's shoulder vigorously, "Young man, you are always so full of fighting spirit and vitality." After speaking, he walked away slowly.

Tony looked at Logan's back, confused, "He came here early in the morning to tell you this?" Professor Logan was notoriously lethargic in the Simpson laboratory, unless he was working, it was almost impossible Saw him in the morning.

"Maybe." Lin Yi smiled.

Hall thruster is a kind of electric propulsion device, which is mostly used for satellite position adjustment and orbit change.Since the first Hall thruster SPT-1972 was put into service in 60, Hall thrusters have been a hot research topic in the aerospace field of various countries in the world.

"My original direction has always been pressureless sintering, but the finished product is not up to standard in terms of heat resistance or sputtering experiments." Tony moved a thick stack of materials out of the drawer, "The only result is probably to demonstrate h -BN is easier to machine than c-BN."

Lin Yi didn't shy away from it, and directly picked up the stack of materials and looked at it at a glance.

"Let's do it again." Lin Yi only read halfway, then put down the information in his hand.

"Now?" Tony exclaimed, there was no experiment schedule, no plan, not even a written idea for the experiment, so it started like this?

"If it's quick, we can finish the preparations before lunch."

Tony Bryce...

"Okay, listen to you." Tony pouted, quickly following Lin Yi's movements.

"You want to lower the sintering temperature so you powderize n-BN?"

"Yes, it turns out that the effect is good. Although it is still a little far from my expectation, it does reduce the sintering temperature. I think I can write a good paper on this point." Tony seemed a little proud .

Lin Yi looked up at the temporary partner with braids tied on top of his head, "Okay, as long as you're happy."

"Put these h-BN powders through a second ball mill with a planetary ball mill, divide them into four groups of 6, 12, 18, and 24, and observe the XRD diffraction images." Lin Yi said this to He Qun.

He Qun didn't say a word after following the two of them in, but Lin Yi noticed that his assistant's first reaction after entering was to familiarize himself with the location of the laboratory instruments and make adjustments, but he was somewhat experimental.

"Okay! Okay!" He Qun immediately responded loudly. He has been working as a handyman in Simpson's laboratory for more than half a year, but he, a quail, will never be able to operate machines. Now that Lin Yi asked him to operate the ball mill, he The heartbeat was so fast that it seemed as if the heart would jump out of the chest cavity anytime and anywhere.

Although this kind of small operation has no technical content and takes a long time, no matter how small a mosquito is, it is still meat. Especially for a rookie like He Qun who will never touch the machine, it is simply happier than a holiday.

Lin Yi looked at the excited assistant with a funny face, "ask if you don't understand, the mouth on your face is not for decoration."

He Qun kept silent. In the past 20 years, the biggest function of his mouth seemed to be decoration.

He Qun carefully took the h-BN powder to find the ball mill, while Lin Yi wrote down a series of book titles and chemical formulas on a piece of white paper.

"Tony, what is the biggest problem of h-BN ceramics in the test?" Lin Yi asked.

Tony found a few graphs from his own experimental data, "sputtering experiment."

"Because of the high cost of spacecraft manufacturing and the growing concern of the international community about space junk, NASA has increased the service life requirements of Hall thrusters. h-BN ceramics have excellent thermal stability and good thermal shock resistance. , good insulation and easy machining, it is indeed more suitable as a Hall thruster channel material than oxide ceramics."

"However, my several sputtering experiments have shown that the excellent anti-ion sputtering performance is the key factor in determining the service life of the thruster. Obviously, the anti-ion sputtering performance of h-BN ceramics is better than that of oxide ceramics, but it is far from NASA It's a bit short of what you want." Tony looked very helpless.

"What about h-BN-based composite materials, have you ever thought about this possibility?"

Tony was obviously taken aback, "You mean that h-BN ceramic powder is mixed with other powders for hot pressing and sintering?"

"Yes, retain the characteristics of h-BN ceramics, while adding materials with good anti-ion sputtering performance."

"The idea is beautiful, but the amount of this material is so large that it is definitely looking for a needle in a haystack."

"We were not looking for a needle in a haystack when we were doing materials science, and I have already screened out several groups of materials with similar sintering temperature to h-BN ceramics, and we can try it slowly." The paper was handed to Tony, and it was filled with dense chemical formulas.

Tony gasped, "You wrote it while talking to me?"

"Otherwise?" Lin Yi laughed.

Tony gave Lin Yi a complicated look, "I probably know why Professor Logan got up early to meet you."

The corner of Lin Yi's mouth twitched. He probably knew that Logan got up early, probably because of the feasibility report he handed to Simpson yesterday.

The two discussed the experimental plan, and before they knew it, it was noon.

"Call your little assistant, let's go to eat first. The restaurant in Simpson Laboratory is good, and the cafeteria in Berkeley is also pretty good. Oh, yes, the day after tomorrow is Christmas. There may be a holiday surprise in the school cafeteria today. Do you want to go? ?" At this point, Tony blinked at Lin Yi, showing a look of "Everyone is a man, you understand."

Lin Yi...

The school cafeteria in Berkeley has already entered the festive state ahead of schedule. Red balloons can be seen everywhere, and teenagers and girls dressed as Santa Claus are smiling and distributing small gifts.

Lin Yi even saw two Santas...kissing, yes, he read that right, there was a lot of booing and joking around, he suddenly touched his chin uncomfortably, is he really a little old?

"Researcher Lin!" Someone shouted from behind.

Lin Yi turned his head subconsciously. It was... that Chinese intern from Simpson, who seemed to be called... Xu Dongkui.

Xu Dongkui walked quickly towards them wearing a white coat from Simpson Labs, and the bright "Simpson Labs" logo got a lot of envious eyes.

"Researcher Lin, Researcher Bryce, He Qun." He greeted the three with a smile.

"Hello, squad leader." He Qun called weakly.

"Squad leader?" Lin Yi repeated it with questionable sentences.

Xu Dongkui waved his hand immediately, "It's an old address in China, and it hasn't been changed for a while. Researcher Lin, our fellow international students know about you, and feel very admired and honored. Seeing you here today, can you Is it an honor to invite you to sit with me?"

Lin Yi raised his eyebrows, he is a good seed, he is so humane and sophisticated before he is out of society, even if he does not engage in scientific research, he will not be bad.

"Of course, my honor. Tony, are you together?" Lin Yi has always been grateful for Tang Runsheng's care in those years, and he is willing to pass on this care.

Tony shrugged, "Of course."

Xu Dongkui led the three of them in, and soon saw several square tables that were put together. There were more than a dozen people sitting beside the table, talking and laughing. Seeing Xu Dongkui bringing Lin Yi and others over, they greeted each other warmly .

"Hey, isn't this Mr. He Qun, our research assistant at the Simpson Laboratory, are you coming to have dinner with us too?" A boy in a corner suddenly said.

The scene froze for a moment.

He Qun stood there, neither standing nor sitting, his face was almost dripping with blood.

"Zhang He!" Xu Dongkui shouted in a low voice, motioning him to shut up.

Zhang Henu pouted, "Squad leader, you are just an informal intern now, and because he can sweep the floor, you have become a serious researcher's assistant. Don't you think it's unfair? I don't know if that researcher is blind , to be able to tolerate a person like him."

Xu Dongkui's expression could no longer be described as embarrassment. He looked at Lin Yi, trying to explain something.

"What are they talking about?" Tony asked blankly.

"He's greeting us." Lin Yi twitched his lips and said solemnly.

"Oh? Greeting people in Chinese is really like a quarrel, hello, hello, hello." Tony greeted everyone excitedly.

Everyone's eyes unconsciously focused on the only foreigner at the scene. Tony felt the enthusiasm of the Chinese people and smiled even brighter. "It's very nice to meet you."

Someone burst out laughing, and the atmosphere at the scene was relaxed.

"Eat, eat, eat first, the world eats the most." Someone laughed and smoothed things over.

Seeing that there are steps under, everyone also echoed.

At this time, someone smiled and asked, "Are you a student of Berkeley, classmate? Why haven't we seen you before?" It was a pretty girl who spoke, and she looked at Lin Yi with a bit of shyness in her eyes.

"Me?" Lin Yi pointed at himself.

"I thought it would be better to introduce myself after dinner, but since you asked, I am the blind researcher that classmate just mentioned."