Riding the wind of rebirth

Chapter 1967 Cavitation Effect
After the song "Hasayaqi" was finished, the music class was over. The kids had never seen the blue double-breasted military uniform with a white hat, so they immediately surrounded Qin Haifeng, chattering and asking questions.

"Uncle Navy!" Zhou Zhi came over to greet Qin Haifeng, still using the name he used to call him when he was a child: "Except for the word 'chuan' between your eyebrows, you haven't changed at all from the photos when you were young!"

"You kid!" Qin Haifeng was extremely happy to hear Zhou Zhi call him that, and suddenly slapped Zhou Zhi on the butt. This was the gesture of affection that the elders of Jiachuan used to show to the younger generation. It was not suitable for Zhou Zhi, who was in his twenties, but it came naturally at this time. Then he took off his military cap and said, "Look! Your father's premature gray hair is now on your uncle's head!"

"It's normal to overuse your brain when doing scientific research." Zhou Zhi put the guitar away and said, "It's too noisy here. Let's go to the study and talk in detail. Who are these two..."

"This is Captain Zhou of the Satellite Base Guard Regiment, your cousin. This is the driver, Xiao Wang." Tu Liangzhi introduced: "I asked your aunt to prepare the meal!"

"Thank you for your help, Uncle Tu!" Zhou Zhi nodded and immediately expressed his enthusiasm to Captain Zhou: "Captain Zhou, welcome, welcome. You see, I'm worried about not being able to find a project to teach children about patriotism and science and technology. A gust of wind brought you here. Can you arrange for us to visit the satellite launch base? We don't even need to go into the control room or wait for the rocket to launch. We just want to take a look at the launch pad."

"This is a small matter." Captain Zhou said with a smile, "It's to educate the next generation! It's also the mission of our base. I'll go back and check the launch mission and contact you then. If you want to see it, let's see it all!"

"Thank you, thank you, thank you so much." Zhou Zhi hurriedly expressed his gratitude.

After coming out of the classroom, Captain Zhou made the excuse of going to help in the kitchen with Xiao Wang and to get something from the car, and stopped following.

Zhou Zhi and Mai Xiaomiao took Qin Haifeng upstairs to their large study.

"You are really good at handling things." Qin Haifeng thought of Zhou Zhi's contact to visit the launch base and found it funny: "The black-necked snake climbs the pole, it's so twisted and cunning!"

"There's nothing we can do. This school doesn't even have a staffing system. It's a charity school. We have to figure out everything ourselves." Zhou Zhi made tea for Qin Haifeng: "Captain Zhou, even if you don't want to see the monks, you have to see the face of the Buddha!"

"This tea is really good. Is it produced in Liangshan?" Qin Haifeng praised the tea and then looked at the couplet on the wall: "When things are busy, I will read books in pieces. When the time comes, the flowers will bloom in an orderly manner. Your handwriting is good, and the couplet is also good. Where did you copy it?"

"Uncle Navy, you look down on people. It's okay if I write my own experience?" Zhou Zhi argued.

"Hahaha, I dare not. Your uncle in the navy can't do this." Qin Haifeng looked at the couplet with admiration: "Take it down and take it away for me later. I remember your fourth cousin's handwriting is very good."

"That's right. My calligraphy was taught to me by my fourth cousin." Zhou Zhi said with a smile, "Uncle Navy, if you like it, feel free to take it. By the way, did you go back to your hometown during your trip to Sichuan? It has changed a lot now."

"It's true that there have been big changes, but it's a pity that we came and went so quickly." Qin Haifeng showed Zhou Zhi a somewhat apologetic expression: "My mother would never want to go to Qingdao with me, saying that she is used to living in the Wu family compound in Baimichang. Elbow, thank you and your family, as well as Zhou Liuniang's family, for taking care of my mother."

"If Aunt Liu doesn't want to go to Qingdao, then she can stay in Jiachuan. Elderly people usually don't want to leave their hometown." Zhou Zhi said with a smile, "When life was difficult before, Aunt Liu helped my eldest aunt and my father a lot. Now that life is better, it is more convenient to take care of them. Uncle Haijun, don't worry. Aunt Liu and my eldest aunt and her sisters are living together comfortably and happily."

Actually, this address is a little strange. Zhou Zhi calls Qin Haifeng uncle and Qin Haifeng's mother aunt. The main reason is that Zhou Zhi's father was raised by his sister. Zhou Zhi calls Liu Auntie from his aunt's side, and calls Qin Haifeng uncle from his father's side. After chatting about some family matters in his hometown, Zhou Zhi asked, "Uncle, what business are you on in Liangshan this time? I was shocked when I heard that the navy was on a business trip in Liangshan. Later, Xiao Miao said that there might be a long-wave base station or radar here, or it might be related to satellites. I wonder if it is true?"

"You all guessed wrong. This time, I actually came to find you." Qin Haifeng said, "But after seeing the situation in your room, I'm a little unsure..."

"Our place does look a bit shabby." Zhou Zhi said, "There are two computers and two laptops in total. But ours are just information processing terminals, mainly used for remote work. If you want to ask Xiaozhi, it's at the headquarters of the Shudu Clover Group."

"Xiaozhi?" Qin Haifeng was stunned.

"Oh, Xiaozhi is the nickname we gave to the cellular neural network computing system." Mai Xiaomiao said, "Elbow asked us to develop a program to use QQ game users to learn to play Gobang online, and this ID is used."

"So that's how it is." Qin Haifeng smiled. "There are so many national projects that seek to increase computing power but fail to do so, but you use it to train Gobang. Isn't that a bit extravagant?"

"It is mainly used to verify the feasibility of machine learning." Zhou Zhi said: "Gobang has simple rules, many people play it, and there are a lot of learning samples. It is a good application scenario for verification."

"That's true." Qin Haifeng nodded: "If you say the rules are simple, aren't the rules of Go simpler?"

"The rules of Go are indeed simpler, but the tactics are too complicated." Zhou Zhi said: "If Xiaozhi wants to learn a higher level of Go, it will take longer to learn, unlike Gobang where you can see results in a short time."

"You are very thoughtful." Qin Haifeng nodded: "Xiao Miao is not only good at mathematics, but also has rich knowledge of physics. He also knows that our navy also has long-wave radars and long-wave communication base stations in the mainland."

"Computer technology and communication technology both belong to information technology and are inseparable." Mai Xiaomiao thinks this is common sense.

6◇9◇Book◇Bar

"Then do you know the cavitation effect?"

Zhou Zhi and Mai Xiaomiao looked at each other and shook their heads.

"That's right." Qin Haifeng explained: "When the liquid medium suffers a local disruption of continuity, such as a local pressure drop, or when the pressure at a certain point in the liquid drops below a critical pressure, the liquid vaporizes."

"For example, if you shoot an arrow in water, if the arrow is fast enough, the water pressure in the part in contact with the arrow surface will decrease. When the pressure drops to a critical point, the water will vaporize, first forming microscopic and then macroscopic small bubbles on the surface of the arrow, and then merging into larger cavities of steam and gas inside the water or at the interface between the water and the arrow. This is cavitation."

"The process of bubble generation, development and collapse is called cavitation. The presence of gas nuclei, i.e. tiny bubbles, and local pressure reduction in the liquid are two necessary conditions for cavitation to occur."

Changes in pressure will change the boiling point. This is junior high school physics knowledge. Combined with this, the cavitation effect is not difficult to understand. Zhou Zhi and Mai Xiaomiao both nodded to indicate that they understood.