Black Technology Refresher Manual

The Christmas holiday was a day and a half away. After the end of the Christmas holiday, the store was supposed to resume normal operation, but unfortunately, it was snowing heavily. The heavy snow did not stop until the third day after the Christmas holiday. The government spent another day to clear the road? The road opened on the fourth day Stores, restore traffic.

Although the store has been opened, compared with the excitement before the holiday, the flow of people is still inevitably reduced. Some local stores are also closed. I am afraid they will not open until after January 1 next year.

Because of the different working leave systems, some people will apply together with Christmas and annual leave, and get ten days and a half months of vacation in one breath. This is probably the reason why some shops are closed.

Fortunately, Chinatown is very lively except for the Spring Festival, and it is very convenient to replenish supplies.

Chen Jingqiu took Sheng Mingan to Chinatown before returning to China after his vacation.

The rented car was parked at the intersection, Chen Jingqiu unbuckled his seat belt and said, "I'm going to do something, you? Stay here? Don't walk around."

Sheng Mingan was in the passenger seat, wrapped in thick clothes, raised his eyelids when he heard this, and responded lazily: "Yes."

Chen Jingqiu got out of the car and walked towards a restaurant on the right, probably to buy cooked food.The back seat is all the food and daily necessities he purchased, all for Sheng Mingan.

Sheng Mingan leaned his head against the car window, watching the passers-by. After a while, Chen Jingqiu came out of the restaurant and stopped for a while while crossing the road. Someone immediately struck up a conversation, but We only chatted for two or three sentences.

Chen Jingqiu opened the car door, "Feeling bored?" He leaned over, stroked Sheng Mingan's hair, pinched his ears, and kissed his chin, as if Sheng Mingan was his bosom Li? Adorable doll.

Sheng Ming'an looked sleepy, neither resisting nor disgusting, and said softly, "Tired."

Chen Jingqiu smiled in his ear and said, "It's because I don't know how to control myself."

Sheng Mingan lowered his eyes, twisted his body, and buried his face into Chen Jingqiu's shoulder, silently conveying his dependence and closeness.

Chen Jingqiu enjoyed Sheng Ming'an's closeness and coquettish way that was different from ordinary people. He narrowed his eyes slightly and stroked his lover's hair.

"In that store? There is a Huaguo chef who can make fish jelly. After talking to him just now, I found that he can also make good soup, so I ordered a takeaway with him and asked them to deliver it at least three days a week. They will notify you an hour in advance, or if you suddenly want to eat, you can call to make a reservation."

No wonder I came out empty-handed because I had booked for a long time.

"Let's go." Chen Jingqiu turned around and started the car, stepped on the accelerator, and passed by a speeding police car.

Back at MIT, the two met Julian who was returning to school downstairs in the dormitory.

Julian was hurrying with the documents in her pocket, and stopped when she saw Sheng Mingan: "Didn't go back to China?"

Sheng Ming'an: "There are still tasks to be done."

Julian forced a smile, lost her mind, didn't notice Chen Jingqiu beside him at all, only said that she had something to do and left.

Sheng Mingan was a little puzzled. After returning to the dormitory, he checked the desk first, and found that there was no trace of being touched, which meant that Julian really just came back to get the materials.

Chen Jingqiu came to ask what happened, Sheng Mingan told the truth.

Chen Jingqiu suggested: "How about installing a camera next to the desk? Buy a pinhole camera online with an installation tutorial, which is very convenient to use."

"I'll place an order later." Sheng Mingan accepted this suggestion.

Chen Jingqiu held Sheng Ming'an's hand and put it in his own, playing with his jade-like fingers. There were faint traces on the middle finger that hadn't faded away. He raised his eyes and looked at Sheng Ming'an's fair and fair cheeks. ?There are dense hickeys hidden in the place covered by his hair.

At first glance, it is scalp tingling.

But these are all Chen Jingqiu's masterpieces, and it's too late for him to love them, so how could he be afraid?

"Chen Jingqiu, I'm very tired." Sheng Mingan remained expressionless.

With a smile on the corner of Chen Jingqiu's mouth, he kissed Sheng Mingan's mouth and said, "You don't need to move?"

Sheng Mingan: "My back hurts."

Chen Jingqiu thought for a while and said, "Let's lie down today." In his heart, it was a pity, because Sheng Mingan's waist was very soft and could be folded into a very difficult position.

But? Ming An is not feeling well, so forget it.

Sheng Ming'an frowned, staring at Chen Jingqiu, who seemed to be gentle and easy to discuss, but was determined to overthrow him. While wrapping his arms around Chen Jingqiu's neck, he lay down on the sofa, and couldn't help thinking, Chen Jingqiu Did you lie to him?

Ever since the relationship took a step further, Chen Jingqiu has been getting closer and closer.

He likes to mess with himself? He can’t get up, especially himself? He looks like he can’t take care of himself and completely depends on him, like a large figure, helping him dress and bathe, feeding him, and trying to carry him to the bathroom? Physiological needs——Because of his fierce refusal, Chen Jingqiu gave up embarrassingly.

Even this kind of dirty thing? I don't dislike it, and I am eager to try it. It seems too perverted to think about it carefully.Moreover, he also learns to advance by retreating. If he is rejected, he respects you on the surface, but from time to time he shows a lonely look, waiting for himself to soften his heart, waiting for himself to take the initiative to give in. It was you who took the initiative to invite me, and if you go back on your word, you're just lying to me.

Desperate to look forward to Shu, greedy and insatiable, two?

Sheng Ming'an's expression showed a trace of pain, his fingers clenched Chen Jingqiu's shirt so hard that they turned white, and a bunch of derogatory idioms flashed in his mind to scold Chen Jingqiu.

He blamed Chen Jingxie for his insatiable desires, being a two-faced person and loving acting, but he didn't want to think about who made Chen Jingxie so presumptuous.

When he scolded or complained in his heart, or when he was being bullied so hard, his eyes were red, his whole body was dripping with sweat, his hair was wet and stuck behind his ears and on his forehead, black and white were distinct, and he was extravagant to the extreme. When he felt that he couldn't take it anymore, how could the two hands wrap around Chen Jingqiu's back obediently!

Who can bear it?

So he deserves to be bullied by?

Chen Jingqiu leaned over, kissed Sheng Mingan's lips, swallowed the scorching breath and panting, like a fish that had finally jumped out of the water and was dragged into the dense and opaque bottom——

Because it was Sheng Mingan who indulged his greed, so in the end, what would he become? All of them were raised by Sheng Mingan.

He has to be responsible.

***

Chen Jingqiu's vacation is over.

He didn't even have an excuse? It took two more days. He didn't have a chance. The domestic research institute made more than a dozen phone calls, forcing him to return to China immediately.

And before he left, he didn't want Sheng Mingan to know? But? Sheng Mingan remembered the day he left, so even though he was very sleepy and exhausted, he still forced himself to get up and sent him out sleepily.

Chen Jingqiu kissed and coaxed: "Don't send it? It's already at the airport, okay? Go back? You? Aren't you going back to China for the Spring Festival? It's only over a month away from the Spring Festival. Be good. When the Spring Festival is over, I will apply to MIT to accompany you as soon as possible. You? Up to four months."

Even though Sheng Mingan was too sleepy to keep his eyes open, he still held onto Chen Jingqiu's clothes tightly, even the buttons? He squeezed them into his palms.

The Uber driver blew his horn to urge him, but Sheng Ming'an was quite stubborn without saying a word. When Chen Jingqiu wanted to stop staying for another day, he suddenly let go, backed up, raised his chin and said, "Go? .”

Chen Jingqiu: "Are you? Are you okay?"

Sheng Ming'an: "It's okay." He sighed, and said to himself: "I just want to remember your smell, body temperature and breath, so that I can follow when I miss you next time. Well, I It's all right, you? Let's go, goodbye."

Chen Jingqiu hesitated, without him, Sheng Mingan's open-mindedness at the moment contrasted sharply with the obsession just now, which made him worried.

"Or I'll take another day off."

Sheng Mingan waved his hand, urging him to get in the car quickly: "Don't dawdle. I finally got ready to part, you? Don't disrupt my plan."

plan?Parting mood plan?

Chen Jingqiu looked at Sheng Ming'an helplessly, and asked him a few words before getting into the car: "Don't go out alone? Chinatown, the law and order there is not very good. I heard that recently a group of juvenile criminals robbed single Asians."

Sheng Mingan said he knew it, and waved his hand again, as if he couldn't wait to say goodbye. Chen Jingqiu glared at him angrily, and he probably guessed Sheng Mingan's psychology.

It is estimated that I have prepared for the separation in advance, sniffed and remembered his breath, and after the separation, I can chat with the memory to comfort me. Maybe I still have a valve in my heart, and set the separation to be able to bear threshold.

Now I'm afraid that if he doesn't leave, it will exceed the threshold that he can bear, so I drive him away.

Chen Jingqiu: "Remember to take care of yourself?!"

Sheng Mingan moved? Did he move? His lips moved, and he responded silently. He watched the vehicle carrying Chen Jingqiu disappear before turning around. He kicked, dawdled, and walked back to the dormitory step by step.

I went back to the dormitory and lay down for a day, digesting the emotional threshold of Chen Jingqiu’s departure. I didn’t recover until the third day. After receiving the notice from Professor Weiss, I drove to the depths of the mine in Minnesota to observe dark matter.

Deep inside an abandoned mine in Minnesota is the second advanced laboratory in the United States to observe dark matter, and in 2011 a project called COGENT observed Weakly Interacting Massive Particles (WIMPs).

WIMP is a kind of massive particle assumed to be dark matter. By capturing a specific amount of energy generated by germanium crystals colliding with WIMP, we can search for the trajectory and existence of WIMP.

According to the address sent by Professor Weiss, Sheng Mingan found an advanced laboratory built deep in the abandoned iron mine, and told Professor Weiss on the phone that a young man would come out to pick him up after a while.

The young man said: "My name is Cecil, and I am Professor Weiss' assistant." He led the way, entered the elevator, and came out after reaching the seventh floor of the basement. He swiped his work card and registered before he was allowed to enter. .

"The boss is hired, so he has to stay here for half a month to study whether the idea of ​​a WIMP colliding with the human body is in line with reality. Here? You need a work permit to enter and exit. The boss said you? Just come? Come and visit for a few days Observation of dark matter, so later I will take you? Go? Apply for a temporary work permit."

Sheng Mingan: "Thank you."

Cecil: "Let's go first? Find the boss."

He walked into the elevator and went down three floors. When he came out, there was a five-meter-long corridor. Through the corridor, he could see a giant particle detector weighing 250 kilograms in front of him.

Professor Weiss and some laboratory researchers were standing on the console and chatting about something. Sheng Mingan and Cecil walked over and stood quietly behind without interrupting.

Professor Weiss: "Summarying all the data calculations, at least one conclusion can be drawn. The probability of WIMP colliding with atomic nuclei far exceeds our previous project assumptions, and the probability of colliding with human atomic nuclei is about once a minute. I thought they were the same as The probability of a human nucleus colliding may be once in a person's lifetime."

WIMPs, axions, and neutrinos are all mainstream candidates for dark matter. According to the standard model of the universe, the universe is full of WIMPs, and billions of particles pass through the earth, animals, and plants every minute. A small number of specific particles collide with other particles, resulting in a burst of energy.

This energy can be observed and calculated, and through calculations, we can gain a clearer understanding of mysterious particles that cannot be observed by human technology at present.

And if we can clearly calculate this mysterious particle, we can further speculate whether it is dark matter.

The particle detector adopts the two-phase xenon technology to measure the signal left after the collision of some part of the weakly interacting dark matter candidate particles and the xenon nucleus.

A white-clothed researcher next to him nodded in agreement: "We still need to update the detection device to observe WIMP more accurately."

Dark matter, one of the two great unknown mysteries of modern physics, even if the existence of WIMPs is observed, it is still impossible to collect and use WIMPs, but it at least proves the theory of supersymmetry.

Sheng Mingan leaned over to look at the signals displayed on the screen. Those were all particle signals observed by the detector, but most of them seemed to be background signals.

Collecting these signals, combined with astronomical observations, that is, according to the dark matter that is pulled by gravity to form a clump moving around the center of the Milky Way galaxy at a certain speed, distributed according to Maxwell's equations, theoretically it can be calculated that the particles passing through the detection The working medium of the device.

Then calculate the probability of the reaction between the particle and the working medium according to the weak interaction, but the probability is very low, which requires the sensitivity of the detector to be as accurate as possible.

There are roughly two ways to increase the sensitivity of the detector. One is to fill a large amount of liquid xenon to keep a certain amount of xenon above the detector. This is the two-phase xenon technology, and it is also the method proposed by Professor Weiss at this moment. .

"From the top to the vapor-liquid surface, and from the vapor-liquid surface to the bottom, apply two electric fields to the detector." After Professor Weiss gave the order, he turned to see Sheng Mingan: "Are you here?"

Sheng Mingan nodded.

Professor Weiss: "How do you feel?"

Sheng Mingan: "It feels very novel."

Professor Weiss: "Have you ever participated in the detector observation?"

Sheng Ming'an: "Haven't seen it? Such a large detector."

This kind of large-scale device is too rare, so I didn't have the opportunity to use it before, and of course I don't have permission to use it now. It's just that Professor Weiss brought him in for a visit.

Professor Weiss: "You? are at a very basic stage of particle detection and dark matter. During this time, you? Just practice with Cecil. Watch more, learn more, do more, but don't be smart. There are no eyes of the intelligence organization here, but they will come to check every once in a while, and your access certificates will be recorded into the central computer."

This laboratory is a large national laboratory in the United States. After the review, some students can be brought in for internships, but it can only be on the periphery and cannot touch the real core.

Like this underground laboratory with particle detectors, it is not the largest detector laboratory in the United States. It is called the Sudan Underground Laboratory, which also detects dark matter, but the candidate particles are neutrinos.

It is built 800 meters below the ground and is extremely confidential.

Sheng Mingan said that he would remember to be cautious in his words and deeds when participating in the project.

Professor Weiss: "Your task is to collect signals, don't do unnecessary things."

He warned repeatedly, obviously attaching great importance to this aspect.

Afterwards, Cecil said: "Don't blame the boss for being harsh, because there was once a student who did something that shouldn't be done and was judged by an intelligence organization for leaking state secrets and tortured for six months as a spy. The result? Fell down the stairs one day? Broke his neck and died. That was a very talented young man, and the boss used to value him."

Shocked, Sheng Ming asked, "What did he do?"

Cecil: "He borrowed the boss's work permit to go to the core area to borrow a device to make one of his ideas, we all? Know? He is a scientific madman, and he just wants more accurate signals to demonstrate the idea."

He shrugged and said in a low voice: "He is about to graduate. That is a Persian. He rejected the invitation of the Federal Research Institute and was about to return to the motherland. It happened that he had a new breakthrough in a very important scientific research project. "

Persecuted?Assassinated by?

Sheng Ming'an raised his eyebrows. Seeing that Cecil quickly changed the subject, he did his best and only kept this matter in his heart?