After completing the last step of the operation, Wang Xiaodong packaged the obtained data and looked at Lu Zhou next to him: "The iterative operation program of the main deceleration stage is completed, the spatial coordinate positions of the perilunar point and the apogee lunar point and the velocity direction of Chang'e-3 are obtained, I will send you an email?" ”

Lu Zhou, who was doing the pen, didn't raise his head and said, "Throw me QQ directly." ”

Wang Xiaodong: "OK, what's next?" ”

“…… Schematic diagram of the trajectory of the satellite around the moon and the geometry of the satellite landing orbit, the data parameters are here, and the drawing is up to you. Throwing the almost full A4 paper brush on Wang Xiaodong's desk, Lu Zhou started the next step of calculation non-stop.

Glancing at the data on the paper, Wang Xiaodong skillfully replaced the Matlab software with SAS software, which is more professional in data drawing, and replied expressionlessly: "Okay." ”

The two cooperate quite tacitly, fighting in their respective fields.

At exactly twelve o'clock at noon, Lin Yuxiang walked into the computer room lightly and put two servings of yellow braised chicken rice on the table, as well as two bottles of canned coffee.

"Scholars, let's eat."

Wang Xiaodong hurriedly got up, took his share, and squeezed out a smile from his paralyzed face: "Thank you." ”

Lin Yuxiang naturally responded with a smile, then walked to Lu Zhou's side and handed out the plastic bag in his hand: "Hey, yours." ”

Lu Zhou didn't raise his head: "Help me put it aside, wait for me to finish this step." ”

"Okay!"

At nine o'clock in the evening, Lin Yuxiang went back to the dormitory with Hatche. And at ten o'clock, Wang Xiaodong also went back. As the workhorse of tomorrow, he must sleep enough today.

At this point, except for Lu Zhou, there are only a few people left in the engine room.

Including Luo Rundong, the second student in the first class, including Liu Rui, the thigh of their team.

Liu Rui, this kid, is naturally there, and the junior student in the statistics department next to him.

The configuration of their team is a bit special, with the thigh in charge of programming as the team leader, and at the same time responsible for part of the modeling work, but it does not involve calculations, mainly assigning tasks to Liu Rui, who is the main modeler, and directing another person to start writing the thesis outline.

The statistician who was programming suddenly asked coldly: "That buddy is from your dormitory?" ”

Liu Rui was stunned for a moment and nodded: "Yes." ”

Xueba said casually: "That guy is very good, I looked at it when I went out to the toilet just now, and they chose question A." There should be a lot fewer competitors than we are. ”

Liu Rui asked strangely: "Then why don't we choose question A?" ”

After thinking about it for so long, the hair on his head is almost gone, and he doesn't feel that question B is easy at all.

Xueba said unceremoniously: "Because I brought you this year, do you think I want to choose question B?" ”

Liu Rui: "......"

Another little friend who didn't talk nonsense from beginning to end: "......"

At three o'clock in the morning, there were only five people left in the computer room.

At four o'clock in the morning, only Lu Zhou was left sitting in front of the computer.

When the sky outside the window glowed with a touch of early morning light, Lu Zhou finally wrote down the last line of the equation.

The door of the computer room was pushed open, and Wang Xiaodong walked in.

"Done?"

"That's it...... Lu Zhou sighed, "the basic modeling has been completed, and all that remains is programming, cartography, and sensitivity analysis by observing the changes in the simulation results." When you're done, I'll start writing the second half of the paper. ”

Wang Xiaodong nodded: "Leave it to me, you go and rest for a while." ”

"Hmm."

Lu Zhou pinched his eyebrows, shook his head, stood up, and walked towards the outside of the computer room.

Compared to the few late nights in the summer vacation, this level is nothing at all.

How exactly he returned to the bedroom, Lu Zhou can't remember very clearly, but he remembers that after pushing the door open, he didn't even take off his clothes, and fell asleep on the bed.

And when he woke up, it was already dusk outside the window.

Sitting up from the bed, Lu Zhou rubbed his messy hair, took out his mobile phone from his pocket, and looked at the time.

I vaguely remember that when I arrived at the dormitory, it was six o'clock in the morning.

"Did you sleep twelve hours......

The next time I go to bed, I'll have to wait for the game to be over.

went to the bathroom to wash up, and Lu Zhou went directly to the computer room.

When he arrived at the computer room, Wang Xiaodong had just finished editing the last program.

Lin Yuxiang was not there, but he helped him buy the food, and it was even a little hot to the touch, so he should have just brought it over.

Lu Zhou untied the plastic bag and was about to tear open the bag of chopsticks, when he found that the bag was open and a note was stuffed inside.

Slightly stunned, he took it out and unfolded it.

【Come on~O(∩_∩)O】

Lu Zhou: "......"

Crumpled the note into a ball, Lu Zhou threw it into the plastic bucket in the corner, tore open the disposable chopsticks and began to eat.

After three times and five divided by two, Lu Zhou went to the bathroom to wash his face, and threw the takeaway box into the trash can outside the corridor by the way.

When he came back, Wang Xiaodong pushed his glasses, stood up from his position, looked at him and said.

"I've finished the program.,I've sent you the code text used in the three questions on QQ.,I'll come back at three o'clock in the morning.,The paper will be entrusted to you.。

"OK, remember to set an alarm, don't forget."

"Yes." Wang Xiaodong nodded and turned to leave.

Taking over the baton like a relay race, Lu Zhou sat down at the computer desk and stretched.

It's seven o'clock in the evening, and there are 37 hours left before submitting your paper.

In these 37 hours, he needs to integrate all the calculations, modeling ideas, procedures, including the further generalization of the three problems, into a 20 to 30 page paper.

No matter how elaborate the model is, no matter how ingenious the programming, the final presentation on the judges' bench will be in the form of a paper. If the paper cannot be understood by the judges, and the judges can understand the subtleties, then there is no way to talk about winning the award.

So, this last step must not be sloppy!

Lu Zhou, who entered the working state, completely forgot about time, his attention was highly focused on the computer screen, and his typing hand was as fast as a burst of afterimages, just like his smooth and meticulous thoughts.

The abstract and keywords at the beginning of the paper are controlled within one page according to the format requirements, and Lu Zhou has undergone simple deletion after writing, which just meets this condition.

No one knows the whole modeling idea better than himself, so it's a lot easier to do.

Then comes the most tedious argumentation process, and here is the dry part of the whole paper, which does not take up too much space, but it is the most time-consuming place to complete.

Because it involves not only the idea of mathematical modeling, but also the idea of programming.

The former Lu Zhou knows in his heart, and the latter needs to communicate with the person in charge of programming to complete it.

As the minutes ticked by, the sun that had completely set outside the window rose again and slanted to the horizon again.

When the night was complete, Lu Zhou finally completed the last line of the promotion part of the problem.

Stretching, Lu Zhou stared at the paper with sleepy eyes that were almost swollen, yawning and muttering to himself.

“…… Now comes the references and appendices, and finally the wrapping up. ”

With his hands on the keyboard, Lu Zhou copied the title of the cited document and pasted it.

【

…… Design and Analysis of Gravity Turning Orbit for Soft Landing on the Moon (C), The Second Academic Conference of the Deep Space Exploration Technology Professional Committee of the Chinese Aerospace Association.2005.

…… Research on Detection and Avoidance Scheme of Topographic Obstacle for Manned Lunar Landing, Space Return and Remote Sensing.2014,35:11-19

……

】

A total of six Chinese articles and one English literature were cited.

In the last step, Lu Zhou copied Wang Xiaodong's code in the appendix at the end of the document.

Standing behind Lu Zhou, Wang Xiaodong pushed his glasses, looked at the text on the screen and asked, "It's done?" ”

"Well, it's all done, you can help me check for typos, if it's okay, just convert it to pdf format." Standing up from the stool, Lu Zhou shook his groggy brain, "I'm going back to sleep, and the work of generating MD5 codes and uploading will be left to you." ”

"You go quickly," after a pause, Wang Xiaodong said a rare word of concern, "Be careful on the road, don't fall." ”

"Hmm." Lu Zhou nodded and walked out of the engine room.