International students returning to 90

1 minute, 2 minutes, as if someone pressed the pause button of the movie, and the screen suddenly stopped moving.

Lin Yi slowly picked up the fork, and put a piece of beef covered in sauce into his mouth. Tony was obviously not in the mood yet. He looked at Lin Yi, then at the Huaguo students with different expressions, and shook his head , Chinese people are really strange.

Christmas music reverberated in the cafeteria, and the students laughed and immersed themselves in the sea of ​​joy. Under the laughter and laughter, this quiet corner was particularly conspicuous.

Lin Yi chuckled, "Eating and eating, I might not be as old as all of you in terms of age, so don't be so serious."

All the foreign students...why do you feel even more sad.

The girls were the first to recover from their embarrassment.

"Researcher Lin, you are so young. You are a researcher at Simpson Laboratory at such a young age. It's amazing."

"Yes, yes, I heard that researchers often stay up late, but your skin is really good."

"The eyelashes are long too." Another little girl hurriedly answered, her entire face turned red, and she was too ashamed to look at Lin Yi again.

The male compatriots who finally mustered up the courage to ease the atmosphere suddenly lost interest in talking and bowed their heads sullenly.

"Thank you." Lin Yi was obviously used to this kind of scene, and he generously accepted the compliments from the female international students with a big smile.

The atmosphere on the side of the female students suddenly became heated.

"Researcher Lin, do you eat dried chili? My mother made it herself. Sometimes I can't get used to American dishes. It tastes delicious when mixed with rice."

"This is my family's secret bean paste."

"I boiled big bone soup. The big bones I bought in Chinatown yesterday have been stewed all day."

A male classmate's spoon fell on the white porcelain plate, making a crisp sound.

Everyone looked over unconsciously.

"Hehehehe, it's the first time I found out that our female classmates are so versatile."

Regardless of whether other people had a good meal, Lin Yi had a very pleasant meal anyway.After politely saying goodbye to Xu Dongkui and others, he and Tony got up and said goodbye. He Qun also stood up immediately when he saw this, and the two were about to leave.

Suddenly a female voice stopped him, "Assistant He, I don't think you ate two bites, take this with you on the way." She said and stuffed an apple for him.

He Qun's whole body turned red from the top of his head to his toes, and his ears seemed to be buzzing like a train passing by. This was the first time a girl gave him something.

"You are the assistant of Researcher Lin. I heard that the researchers are day and night upside down and have irregular diets. You should watch him."

He Qun...

A group of female compatriots...

"You are really cunning."

"I have been in the United States for so long. Apart from professional knowledge, I have learned one thing. Opportunities should be seized on their own initiative, rather than waiting on the spot."

Facing the "accusations" from her companions, the girl raised her head proudly, and strode out of the cafeteria. Of course, she still didn't forget to bring her big bone broth, which she had boiled all night, so it can't be cheap Get rid of these ignorant people.

Tony and Lin Yi walked side by side under the boulevard in Berkeley.

"Tut tsk tsk. Lin, it's a good thing you're not an American." He said suddenly.

Lin Yi looked at him amusedly, "Why?"

"I'd be jealous if an American girl threw herself at you," Tony said solemnly.

"It's not that you don't understand Chinese."

"But I can understand girls' expressions!" He replied confidently, "Even if the skin color is different, the hearts of girls all over the world are the same."

Lin Yi was silent for two seconds, "It makes sense. Materials in nature have something in common even though they have different physical forms, and often these commonalities will be an opportunity for us to deeply understand and use them successfully. .”

Tony...

The ball mill was working automatically, and He Qun was like a hen waiting for the chicks to hatch, holding a bright red apple in her hand, staring at the countdown on it motionless beside the ball mill.

Lin Yi and Tony occupied almost half of the corridor of the Ministry of Aeronautics and Astronautics, which was densely covered with white papers filled with equations. Tony leaned cross-legged next to two large boxes full of materials, flipping through them quickly while writing in his notebook. Write and draw.

"Lin, how should the temperature be determined? I think it should be between 1200-1800. If it is higher, the burden on the machine will be greater."

"That's why it depends on the diffraction pattern after ball milling. I think the sintering point will not be too high."

Six hours passed quickly, and He Qun excitedly poured the first group of ball-milled h-BN powder over.

"Go for XRD phase analysis."

"Okay...Okay!" He Qun stopped immediately when he heard this, turned a corner and ran to the equipment room to the side.

Tony looked up at the cheerful assistant, and suddenly said, "Although it's a bit stupid, it seems to be quite useful."

While setting up the eight sets of sintering parameters, Lin Yi replied, "I think so too." For a strong researcher, a researcher assistant like He Qun who doesn't know how to ask questions and can only obey orders obediently is the best. up.

Once an experiment is done, it is not a matter of a day or two. After 24 hours, the diffraction comparison diagrams of the four groups of powders after ball milling came out. The h-BN powder without ball milling had obvious diffraction peaks, and after 18 hours of ball milling , the diffraction peak is almost small, and as time increases, the diffraction pattern of the powder no longer changes significantly.

"The ball milling time was officially determined to be 24 hours, and the official experiment report was recorded."

"Okay!" Tony nodded, and his fingers immediately flew on the computer.

"We have officially started to prepare h-BN ceramics. This experiment will last for a long time. You are all right." Lin Yi has already taken the absolute dominant position in the experiment without knowing it.

Tony has no objection to this point. In the process of cooperating with Lin Yi, he discovered for the first time that it is so easy to do experiments. It seems that someone has paved the way for him. He just needs to follow the path. If you walk forward, you can reach your destination.

This hearty, almost non-blocking feeling is truly addictive.

"No problem!" He Qun straightened his chest in a serious manner.

Lin Yi looked up at the assistant who looked like a military order, and suddenly turned his head and asked Tony, "Where's your assistant?"

Tony curled his lips, "Thomas? He, you robbed him of his position as a researcher, and in a fit of rage, he asked for leave early and went back for Christmas."

Lin Yi touched his nose, and said without sincerity, "I'm really sorry."

"You're welcome, as long as you borrow me to use it together. To be honest, Thomas' qualifications are older than mine, and I can't handle it at all."

"Is the hot-press sintering furnace preheated?" Lin Yi didn't answer the question at all.

"Well, it's all right." Although He Qun hasn't operated the machine for more than half a year, every time he has an assistant to operate the machine, he will carefully write down the key points of the operation.

Lin Yi nodded in satisfaction, got up randomly, "Change clothes, and enter the equipment room."

The equipment room of the material science laboratory is much larger than that of ordinary laboratories. For example, the hot-pressed sintering furnace that Lin Yi and the others will use soon covers an area of ​​seven to eight square meters, which is comparable to the workshops of some small factories.

The hot-press sintering furnace consists of three cubes and an oval-shaped sealed furnace. Although the equipment in the Simpson laboratory is the most advanced in the United States, everyone is still fully armed and not even a hair is exposed.

The all-green fire-proof and splash-proof lab coat has been reinforced on the upper right front, upper left front, lower right front, lower left front, upper back, lower back and left and right sleeves. According to Tony, these are all It is a new material that has not been circulated in the market. Wearing this suit, you can dance in the fire scene without any problems.

"Fill with nitrogen."

"Nitrogen filling is complete!"

"Put in the powder."

"Powder in place."

"Tony, temperature, 1200 degrees Celsius, pressure 25 MPa."

Tony nodded, and quickly started to operate on the machine interface, "The temperature and pressure are adjusted."

The high-temperature sintering furnace made a muffled sound and started to work slowly.Simpson's high-temperature sintering furnace is custom-made, the price is more than a million dollars, and the airtightness is excellent, but even so, the three of them still seem to feel the rising temperature.

"Four sets of experiments were carried out at the same time, with the same temperature and pressure. They were held at 1600, 1700, 1800, and 1900 degrees Celsius for 0.5 hours, and the samples were analyzed."

"no problem!"

"He Qun, you can do another experiment. Fill it with nitrogen as a protective gas. The temperature is 1200 degrees Celsius, the pressure is 25 MPa, and the temperature is raised to 1800 degrees Celsius at the same time. Keep warm for 1, 2, 3, and 5 hours respectively, and observe the results of the samples."

"I?"

"Is there a problem?"

"No, no!"

The sound of the equipment room rang all night. This time, even Researcher Lin, who attaches great importance to the quality of life, no longer cared about the simple reduction of the laboratory, and went directly to the researcher's lounge on the third floor to spend the night.

When Lin Yi walked down slowly with drowsy eyes drooping, He Qun and Tony had already stood by the high-temperature sintering furnace.

"There are still two hours, and it will be out in two hours!" Tony said excitedly when he saw Lin Yi.

"You haven't prepared h-BN ceramics once or twice. What are you excited about?"

"You don't know, this time I have a hunch that we can succeed. This is the intuition of a mature researcher."

"Okay, you guys stay tuned, I'll go have breakfast." As he spoke, Lin Yi walked slowly to the restaurant on the first floor step by step.

Two hours later, eight h-BN ceramics with different grain sizes came out of the furnace. Tony and He Qun looked at the eight samples almost as if they were lovers.

"What a beautiful structure, what a gorgeous look, look at their SEM fracture appearance, does it look like a bunch of roses!" Tony sighed loudly, clutching his chest.

"Well, it's very similar, get ready, take your rose back to the furnace and rebuild it, we're going to graft it with a peony."