For Liang Yuan, what he and two young girls did and said during this period is likely to be thrown a magnifying glass by the government department in the future. If the incongruity is exposed, wouldn’t it be a tragedy to be pulled out and sliced for research?
Dongda Chemical Laboratory is a two-story building built in the Republic of China, when Wang Yongjiang, the president of Dongda University, worked as an office building.
The whole small building is made of blue bricks. The appearance refers to the Romanesque architecture, which is the most classic combination of Chinese and Western styles in Dongda University.
At that time, Chen Qian loved the outer wall of the blue-gray experimental building, which was permeated with distant breath, green moss and old blue bricks, and the mottled ancient meaning often dragged the northeast canal bay of Liangyuan Sankong Bridge to look at the bathing sunset experimental building.
Look at the eyes, I am very familiar with the building. Liang Yuan’s mood is slightly blue, but it is soon smoothed by the girl in the palm of her hand.
Some people, some things, maybe missing is far worse than forgetting Liang Yuan.
Take out the Dongda student card and the certificate of participating in the Youth Science Competition and hand it over to the staff of the management laboratory building for inspection. After Liang Yuan became familiar with it, he took two girls to the second floor.
On the second floor is the storage ground of various reagents in Dongda Chemical Laboratory. The reservation target is in the middle.
Chapter 26 Go against things ()
Although seven or seven years ago, the location of the experimental reagent storage room on the second floor was different from Liang Yuan’s memory.
Staring at the dark red door that hasn’t changed for a century, Liang Yuan breathed out a long breath to ease the absurd entanglement that caused by the time deviation.
Pushing the door of the reagent storage room, the unique bitterness of the chemical laboratory came to my face.
Rows of tall white shelves filled the whole room, and glass bottles of different sizes were placed in order, with colorful chemical reagents in them.
"Oh, a lot of bottles. How to choose this?" Ning Wanfei took the door of the storage room with her.
"If I had known, I would have said that the coin had gone to the physics laboratory. The materials here all look like powder. Do we still have to fiddle with that troublesome hot rolling equipment?" Ning Wanjia said distressfully.
"Just grab the three of us and pick the same one, and then just touch two bottles with your eyes closed." Liang Yuanxiao said.
"Well, I’ll see if there is anything similar to metal." Ning Wanfei said as she went to the east shelf.
Liang Yuan recalled his past life and went to the southwest corner of the building. In Liang Yuan’s memory, there was a place where Dongda placed machine materials and reagents.
Ningwanjia followed Liang Yuan’s lead and turned to the right side of the room.
Silver nitrate, sodium chloride, potassium carbonate litmus, phenolic aldehyde, various ph test papers, acid-base indicators … Liang Yuan looked at many familiar things in previous lives on the shelves and felt cordial.
Do you want to choose the old line when choosing a major? If you choose a chemical major, you will probably break several glasses. Liang Yuan is looking forward to thinking about it.
"Xiaoyuan has a lot of materials. What shall we choose?"
Girls around quietly hug Liang Yuan waist from behind.
"Don’t choose liquid material. How to measure it after freezing at low temperature? We haven’t done it. Let’s find solid or powdery material." Liang Yuan said slowly.
After browsing about two thirds of reagents, Liang Yuan finally found what he needed on the last shelf in the corner of the room.
A large bottle of gray-black magnesium diboride powder that looks dirty next to white sodium hydroxide particles is quietly packed in a wide-mouth glass bottle with a lid.
God’s eye Liang Yuan is excited to think that Neusoft has prepared this thing as a constant reagent, otherwise I really don’t know how to justify it without showing any traces.
At this time, magnesium diboride is used as a special chemical reagent, fireworks additive and additive for improving rocket combustion efficiency, which makes people completely unaware that this simple and cheap compound has excellent conductivity.
Dongdaying chemistry, physical chemistry, chemical thermodynamics and other majors are quite strong. Liang Yuan’s previous chemistry professors at Dongdayong University often got national rocket propellant research projects, which is also the case. Magnesium diboride, a rare artificial compound in the 2nd century, can become a permanent object in Dongdayong University.
Magnesium diboride crystal belongs to hexagonal crystal. Scientists have been able to synthesize magnesium diboride artificially in the laboratory as early as 195 years, but its conductivity has never been studied.
Liang Yuan’s previous life was conducted by jon jonsson Chun, a fourth-year student of Nishiyama University.
In March of 2002, this college student who is about to graduate and enter the society accepted the experiment arranged by the guidance professor Qiu Guang Chun Institute to test the conductivity of magnesium diboride.
After jon jonsson made 165 samples of magnesium diboride, a pair of them carried out various conditional conductivity experiments, and the results showed that magnesium diboride had conductivity characteristics, so it was unexpectedly excavated.
After Qiu Guang’s pure team announced this achievement to the world, the ball science community set off the first current research upsurge of high-temperature conductors in the decade. In just one year, the papers on magnesium diboride rose from ten digits to tens of thousands of levels every year.
After more than a year of research, human beings have a preliminary understanding of the conductivity of magnesium diboride.
The transition temperature of pure magnesium diboride crystal is up to 39k, which is much lower than that of Yttrium-barium-copper-oxygen-conducting compounds in the decade, and the transition temperature is up to 77k, which can make liquid hydrogen or liquid neon, which is more expensive than liquid nitrogen, be used as the coolant to keep the conduction state.
Of course, compared with the expensive liquid helium as coolant in the 1910 s, the niobium train conductor magnesium diboride coolant can be said to be quite cheap
Judging from the transition temperature, magnesium diboride has no advantages, but it has great advantages in industrial practicality except that the transition temperature is lower than that of high temperature conductive materials.
From the angle of view, the raw material of magnesium diboride is cheap. Whether magnesium or boron is scarce relative to the earth, rare elements such as yttrium, barium and niobium can be said to be almost limited.
Although magnesium diboride is similar to ceramic material in processing, magnesium diboride powder is different from discrete magnesium diboride powder which is extremely difficult to process. It has good compactness and is very easy to be processed into wires or films.
More importantly, magnesium diboride crystal can be directly cold-rolled at normal pressure and room temperature after being finely crushed to obtain wire materials with excellent performance.