In 26 years, he insisted on the experimental desk. This is the spirit of Lord Lan!

"When I was seven or eight years old, I did n’t have any toys when I was a kid, so I made a toy gun and a small wooden cart with a wood.” This smile in front of me recalled the middle -aged people of my childhood. Teacher Zhang Yu, director of the Experimental Teaching Demonstration Center.

The picture of making small toys by myself has become Zhang Yu's unforgettable childhood memories:

"A group of children sitting together, portraying the gun on the wooden board, tied the gun to the shell with iron wire, slowly picked out the small mouth, put on the rubber band, fix the empty space of the empty space with the nails, and hook my fingers a finger. , Hear a sound of 'slap'! "

In combination with hobbies and work, Zhang Yu has been buried in the workbench for engineering technology for 26 years to "escort" for students' experimental lessons. He simulated black, cold, and vacuum space environment systems for the space light communication test for two years in the laboratory, and made scientific experimental devices such as "big tanks"; after more than three years of struggle with the team, he did his own hands to do his own hands. A high -yield compact neutron generator breaks foreign technology blockade and product monopoly.

Zhang Yu is assembled a neutron detector parts

"The process of self -study by students is more important than grades"

On Zhang Yu's desk, there is an out -of -print textbook -"Atomic nuclear physical experiment method". The paper carries Zhang Yu's memory of the teaching lesson.

In 1996, Zhang Yu graduated from the Department of Modern Physics of Lanzhou University. At that time, several old gentlemen who were in charge of experimental teaching were retired. He was left in charge of teaching experiments and research. The main task is the professional experimental teaching of undergraduates of nuclear physics professional, taking into account the maintenance of instrument, starting from the instrumental maintenance, and doing a lot of applied scientific research work in the spare time.

At that time, the two experimental topics of the two experimental courses of the "Ocological Nuclear Physics Experiment" and "Ocological Nuclear Physics Experiment Methods" were responsible for Zhang Yu. The instruments involved were very professional. It was not easy for the undergraduate students who just graduated. In order to ensure the successful completion of the experimental course in the new semester, he moved a marching bed to the laboratory during the summer vacation. It was two months as soon as he lived. First, 10 experiments such as "NAI (TL) spectrometers", "γ absorption", "α general meter", and "α 普 自己", "meet measurement" have been done many times to explore the characteristics of each experiment and master the performance of each set of equipment.

After many years of experimental teaching accumulation, in response to the college's new engineering undergraduate major — nuclear engineering and nuclear technology, Zhang Yu created a new experimental teaching model in 2010, and opened the "Nuclear Nuclear Nuclear Nuclear Students Technical and Application Experiment "Course. This course is different from the traditional experimental teaching model. The characteristics are that students are required to choose a topic, design, produce, and complete an experimental project by themselves within the scope of professional courses. The teacher is responsible for guidance and confusion.

During the experiment, students need to independently complete the "project design report". After the teacher reviews the experimental principles and feasibility of the design report and passes, the students start to design the schematic diagram and PCB board map, carved PCB boards by themselves, buy materials themselves, personally handle their own hands Produced finished products and debugging, and finally achieved design goals. At the end of the semester, refer to the submission of the topic of the academic papers mode and responded.

This course has been opened for more than ten years, and has explored a new way for the teaching of engineering experiments. It has been widely praised by students. The students have said that "this is the experimental lesson that university should have." However, some students feel that the senior seniors are facing jobs, and the course is very hasty, and they are required to go to the sophomore in advance. However, Zhang Yu's consideration is that senior students should already have the ability to think independently and independent innovation. This course focuses on cultivating students' ability to comprehensively apply knowledge, independent thinking, independent innovation, and self -care.

"They have to make brains and use the undergraduate three years to make a product they want." This is Zhang Yu's expectations and requirements for students. He actively provided the conditions for the students to do practical experiments. "Some things can be learned by listening to the class. At that time, every student in college was prepared by the e -iron, and the radios and headphones were broken by themselves. I like it, and I can improve it quickly. "

In order to create conditions for the basic skills of engineering, Zhang Yu also started to build a nuclear technology innovation laboratory. In 2008, the Lan Da Instrument Factory replaced the waste tool and equipment. He contacted the other party to come to the old tool, and asked someone to help the old tools and equipment into the laboratory before using it.

As the director of the Provincial Experimental Teaching Demonstration Center of the School of Nuclear Science and Technology of Lanzhou University, Zhang Yu sometimes leads other teachers from the center to design, processing and repairing experimental equipment. The construction and reconstruction project of the room provides technical guarantee for the smooth development of undergraduate experimental teaching of the college.

"The neutron generator starts with the hammer handle"

Zhang Yu's office area in the Chengguan Campus was separated from the laboratory from several sets of cabinets, and the office area accounted for one -third of the entire space. Two areas are connected by one meter wide. The experimental area is placed with three workbenches and severe polishing drilling instruments. Several electrical measuring instruments are placed in the cabinets by the wall.

On a long table next to the desk, large and small tools are scattered, but this is not his "all home". When Zhang Yu took out four toolboxes and introduced the large and small tools he collected, respectively. When its role, the smile on the corner of the mouth increased a little. "You see, the gadgets assembled in my hand are part of the neutron detector." Zhang Yu sat in front of the experiment and pointed at the device in his hand. The successful "high-yield compact D-D neutral generator" developed by the team is one of Zhang Yu's most proud works.

Compact neutron generator is an important controllable neutron source. Compared with the neutron source of the isotopes, there is advantages such as high neutron production and good radiation safety. It has important application value in the field of neutron application technology. The United States and other developed The country has mature products, but it is usually restricted to China for the reason that it can be used for military research. In response to the current situation of the lack of compact neutron generator technology in my country, Yao Enze and Zhang Yu's research team set it to key research on the "Thirteenth Five -Year Plan" period.

The advantages of compact neutron generator are small volume (280mm × 1000mm), and high production of neutron production (D-D yield 3 × 108/s). A key technology in R & D is to feed 150kV high -pressure in a small space with a diameter of about 280mm to accelerate the particle particles and the target to produce neutron. In addition, reducing power density on the target and inhibiting secondary electrons is also a tricky problem.

Since the original high -voltage socket is not provided abroad, this requires the development of high -voltage feedback to the system. Once the team members found that the insulation layer of the imported high -voltage cable -silicon rubber would "fire", and the surface of the insulation layer was hit by an electrical spark. In order to solve this discharge problem, research on the insulation layer of the high -voltage cable is carried out. After a long period of repeated experiments, this problem was finally solved through special means. The secondary electronic suppression of high -voltage accelerators has always been difficult to solve. Zhang Yuhe's team member public relations solve the secondary electronic suppression technology of compact neutron generator.

The prototype test is completed in the experimental building of the Yuzhong Campus. It is a unique building with a thickness of two meters thick by the concrete and two meters thick. When testing the prototype test, the team members will place the camera inside and complete the control and data monitoring in the external control room. Once the prototype testing experiment cannot be interrupted, Zhang Yu and his classmates have continuously monitored the 48 -hour or even 72 -hour continuous monitoring that it cannot rest. It is common for the afternoon of three or four in the afternoon to delay lunch. During the experiment, the team members had difficulties and found Zhang Yu. After the experiment was tired, Zhang Yu took the "old place" that the classmates often went to eat.

After multiple structural process optimization design and high -pressure beam loading experiments, in 2020, he successfully completed the research and development of key components with other members of the team. Has made outstanding contributions, and its technical indicators entered the international advanced ranks, laying a high -yield controllable neutron source foundation for the research and development of my country's neutron application technology system.

At present, Teacher Zhang Yu is leading the team of young scientific researchers to the promotion and application of compact neutron generators. There are 3 equipment that have been developed, two of which have been provided to users. The team will also cooperate with scientific research institutes such as China Nuclear Group and is committed to allowing the production of neutron generator to achieve stability in long -term operation. In addition, the team is developing a strong stream neutron generator with 5 × 1012/s with a D-T neutrons.

Participating in this scientific research task also allowed students to gain growth. "Students should polish their practical technical ability, even if they start from making small hammer handles, sink to sit down, and polish the work on their hands. These sub -generators can solve the results of major problems. "Zhang Yu said.

For more than two decades, Zhang Yu's achievements are not only neutron generators. He has also developed and produced 252CF single -particle effect test system, space light environment simulation experiment system, industrial site neutron activation analysis online monitoring system and other products. When making a space light environment simulation test system, the simulated space environment encountered many problems. The main thing is to simulate the dark and cold environment of space in the vacuum tank and establish a adjustable constant temperature platform. In order to establish a vacuum heat in this "dark can", he overcome technical problems such as liquid nitrogen explosion at minus 196 degrees Celsius, and he took two years in the laboratory.

"The Department of Science and Technology of the Lan University Nuclear Nuclear is the same as that of Peking University. It is as good as Tsinghua University. The first strong neutron generator in China is Su Tongling, Sun Biehe, Shui Yongqing and other old gentlemen. When I came out, I planned to continue the compact neutron generator. "Zhang Yu said.

Zhang Yu's textbook

"The task hit me on my head, I will do it well"

From 1996, he became a lecturer, until 23 years later in 2019, Zhang Yucai commented on the associate professor. He laughed that he was a "alternative" associate professor who focused on teaching and product development.

When I first worked, I earned more than 300 yuan. I lived in the campus tube building and watched the two thousand yuan per square meter of a house across the two -point part at that time. Zhang Yu only felt that "it has nothing to do with us. Integration, I don't want to evaluate the title or something. "

Talking about Zhang Yu, a colleague, Professor Yao Zeen said that he has a valuable quality: "Regardless of personal gains and losses, work hard, and not publish academic papers. Successful research and development and applications have made outstanding contributions, showing a good spirit of 'craftsman'. "Zhang Yu's scientific research team has a clear division of labor. Teacher Yao Zene is responsible for macro grasping direction, and Zhang Yu is responsible for the specific implementation of the project. The scientific research team had a request for the team's echelon. When he went out to scientific research exchanges and investigating cooperation, he found that the problem of title that he didn't care about before became a "obstacle" for his work. "It is difficult for application -oriented scientific research to come up with articles. My papers are mainly to deal with practical problems and have strong practical guidance, but they are not cutting -edge." "I can't have too much idea to engage in research and development. Once I am distracted, I can't do it well." Zhang Yu said. "The teacher’s job is teaching. When you get the salary given by the country in this post, you must be real. Doing things on the ground, let alone do what you like. "

After staying at school, he began to be responsible for experimental teaching and scientific research. Zhang Yu knew the importance of laboratory security to schools and students. During the construction of the Second Experimental Building of the Yuzhong Campus of Lanzhou University, he asked the architecture to build only indoor power distribution. The laboratory's running lines and sockets led several teachers in the laboratory to complete themselves. Considering that there are many laboratory lines, in order to use the safety and neatness of students, he uses a safe and sturdy semicircular "buckle groove" wiring, and then fixed to the floor to add a layer of "protective case" to the safety of students Essence To avoid the use of welding methods to avoid virtual connection, it is safer and reliable. In order to be safe, the scientific research of the neutron hall is to climb the ditch and on the bridge, and to do it yourself.

Zhang Yu believes that this is his "teaching service" as the director of the experimental center, and it is his duties to create a safe laboratory for students. The first section of his experimental lessons is "laboratory safety and nuclear safety". So far, the laboratory has not had any accidents in the laboratory in his hand. Put. "

While technical research, Zhang Yu also paid attention to the cultivation of young technical talents. Through the help belt, the two young engineers of the team have grown rapidly and have become the technical backbone that can be alone. He also instructed the graduate team to participate in the 7th China International "Internet+" college student innovation and entrepreneurial competition based on the results of compact neutron generators, and won the Gansu Division Gold Award and the National Finals Silver Award.

However, Zhang Yu also has his own difficulties. "Science and science of science and science is scientific. Young people have followed four or five years without articles, and the project cycle is long and slow. Research Team". Zhang Yu said that in response to this phenomenon, he hopes to have a more reasonable classification evaluation system, which is conducive to the development of new engineering.

During the decades of participating in the work, Zhang Yuqi practiced the ability to comprehensively apply the ability to solve engineering problems. However, he commented on himself "there seems to be no housekeeping skills, but just doing things and doing things seriously."

Content source ｜ Lanzhou University Party Committee Propaganda Department (Rong Media Center), Lanzhou University News No. 1035

Text ｜ Wang Ying

Edit ｜ von Yifu

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