In the early morning of that day, An Xin had a trace of sadness on his face. The movement outside was vigorous and vigorous. After a few years, not only did it show no signs of dying down, but it became more and more prosperous.
Although their family was not affected for the time being, she couldn't help but feel worried.
Be prepared for danger in times of peace, what should they do if something happens to their family?
"well."
An Xin couldn't help but sigh when she thought of these bad things.
An Ran and An Nuo couldn't help but look at each other when they saw their mother sighing again. There were doubts and helplessness in their eyes.
Eight years have passed, and An Ran and An Nuo have become grown-up girls. If the school had not been closed, they would now be in the second grade of junior high school.
But the school was closed and it was a mess outside. For their safety, Li Jie strictly ordered them not to go out.
Fortunately, both sisters knew the seriousness of the matter and stayed at home obediently.
Li Jie's family no longer lives in their original place. Seven years ago, they moved into the institute's family home.
Although the location here is a bit biased, there are advantages to being biased.
In addition, the security here at the Family Courtyard is more guaranteed. There are sentries armed with live ammunition at the entrance of the Family Courtyard 24 hours a day.
It is precisely because of this that the wind, rain and rain outside cannot blow in here.
Seeing the real thing in the hands of the sentry, those early villains who caused trouble simply didn't have the guts to attack here.
So, it's safe here.
On the other side, although Ouyang Anjiang and Ouyang Anhui also heard their mother sighing, they were still young and ignorant after all, and had no idea what their mother was sighing.
Their elementary schools were also closed. At first, the two little guys ran home happily.
How comfortable it is to not go to class!
As a result, they would not go to class if they didn't go to class, and they didn't learn anything less that they should learn.
An Ran and An Nuo both had very good grades. Li Jie stipulated that the sisters should take turns tutoring their younger siblings in their homework.
"Mom, when will dad come back?"
An Ran suddenly put down his chopsticks and asked.
"It will probably take a few days."
Hearing her daughter's question, An Xin's attention shifted a little.
She just had a phone call with her husband yesterday, and 'Ouyang' mentioned to her on the phone that he would be able to go home in about three or four days.
'Ouyang' suddenly became busy, and An Xin was really uncomfortable for a while.
In the past few years, Ouyang was always busy, but he would go home every day, sometimes a little later at most.
Since February this year, my husband has suddenly become much busier. He leaves early in the morning and comes home late. Sometimes he often stays up late at night and sleeps directly in the laboratory.
An Xin was not worried at all when her husband stayed away from home at night, she was just a little distressed.
Now they live very close to the institute, even if not, it is only about ten minutes away.
Obviously it was so close that my husband didn't have time to come back. It must be very busy there, so busy that he couldn't even squeeze out ten minutes of free time.
However, no matter how busy Ouyang is, he still takes time to make a phone call to his family every day, even though the time is very short, only three to five minutes.
"It will take so long."
An Ran was a little disappointed when he heard this.
When she called her father last night, she couldn't talk to her father. This was not only the case yesterday, but also the day before yesterday and the day before yesterday.
She misses her father a little bit.
At the same time, Annuo's expression was slightly disappointed.
Seeing the disappointment on her daughter's face, An Xin couldn't help but feel a little bit disgusted. It's far more fragrant than near stinky. This sentence is not unreasonable.
When it comes to the person who spends the most time with her daughter, she is undoubtedly her.
But An Ran and An Nuo obviously like Ouyang more, not only for them, but also for the two younger ones.
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In the research institute two kilometers away, Li Jie has been really busy recently.
Since the research of aramid-1414, he has not been as busy as he is now for a long time.
Li Jie was the only one in the huge office. He lowered his head and bent over his desk, with his pen flying as if he was calculating some data.
At this time, there was a burst of rapid footsteps not far away, and then a rich male voice sounded, which was full of excitement.
"Director, the latest data is out!"
Looking up, I saw a middle-aged man wearing a gray shirt running over excitedly.
The man ran up to Li Jie like a gust of wind, and put the documents in his hands on the table with a snap.
"This is the latest data."
"According to testing, the yield strength of No. 56 steel has reached 750 MPa!"
Yield strength is the yield limit of a metal material when it yields. Simply put, if the yield limit of a material is 200 MPa.
When the external force is greater than this ultimate strength, the material will undergo permanent deformation.
MPa is a unit that represents pressure. One atmospheric pressure is about 0.1 MPa. The yield strength of No. 56 steel is 750 MPa, which is approximately equal to 7500 atmospheres.
Today, the best steel in China has a yield strength of only about 400 MPa.
The yield strength of No. 56 steel far exceeds this figure, and if it is increased a little, it can even reach twice the level.
At the beginning of the year, a political task was assigned to the Daocheng branch, which was to develop a high-strength special steel based on existing data.
Its yield strength should preferably exceed 600.
Of course, the superiors also knew how difficult it was to complete this task, so the superiors did not require it to be completed.
Li Jie knew very well that when the superiors sent him the text, they probably had the idea of taking three poles if there were jujubes but no jujubes.
After all, they haven't produced any major results for a long time.
When the document was delivered and he saw his superior's performance requirements for the material, Li Jie suddenly thought of something.
This material must have been used on military ships.
The steel used in ordinary civilian ships only needs to be strong, durable, and resistant to seawater corrosion, and a yield strength of more than 200 is sufficient.
At the current time point, ships that require steel materials of more than 600 MPa are likely to be used on Type 091 nuclear submarines.
A few years ago, he heard that a new research institute had been established above, which was under the Naval Ship Research Institute.
After that, Li Jie also received some research projects one after another.
He has produced a lot of achievements over the years, but considering his background, he will definitely not be able to directly participate in core projects such as nuclear submarines, which are important weapons of the country.
This time he was asked to study special steel, which was already an exception.
Type 091 is the first generation nuclear submarine in China. From the moment he received the mission, Li Jie made a decision. This time, he would go all out.
Personally participating in the construction of China's first-generation nuclear submarine is definitely a very memorable event.