The Science Fiction World of Xueba

Xu Xingguo was taken aback for a moment, and asked in confusion, "Did you take the exam all at once? Professor Pang, have you studied all these professional courses by yourself?"

Pang Xuelin nodded with a smile and said, "Almost."

These courses listed by Xu Xingguo are all basic courses for training a scientific researcher specialized in materials science. Pang Xuelin has been in the world of Wandering Earth for more than 20 years, and he has already mastered these basic professional knowledge.

To him, such an exam is nothing at all.

Xu Xingguo hesitated for a while, thinking of the level demonstrated by Pang Xuelin's design of the high-purity carbon nanotube preparation and characterization experiment, he said: "OK, Professor Pang, we have prepared a total of 22 different professional course papers. The plan is to let you choose sixteen of them and take two days to finish the exam, so two days may not be enough."

Pang Xuelin said: "Let me try it first, maybe if it is fast, I can finish it in a day."

Xu Xingguo and the others smiled, they couldn't deny it, they thought Pang Xuelin was joking.

After all, no matter how fast a paper is finished, it takes half an hour to finish, and you have to do it for more than ten hours without eating or drinking.

Not to mention the need for constant thinking during this period, ordinary people can't bear it at all, and Pang Xuelin can finish it in two days, which is considered fast.

"Okay, let's get started!"

Xu Xingguo and the others brought Pang Xuelin to a small meeting room and started handing out papers.

The first one is organic chemistry test questions.

Various valence bond theories, molecular orbital theory, resonance theory; structural characteristics, conformation, and chemical properties of alkanes, alkenes, alkynes, aromatic hydrocarbons, and bridged rings; spectral analysis, infrared, ultraviolet, nuclear magnetic resonance, and mass spectrometry; organic molecular analysis Various stereostructures, enantiomers, chiral molecules, mirror images, optical rotation, enantiomers, epimers, internal and external racemates, chirality...

The exams at the undergraduate level are all the most basic things. Pang Xuelin has long been familiar with these contents. He almost started to write directly when he saw the topic. It was done by him.

Li Jianbin took the test paper and scanned it from top to bottom.

Xu Xingguo asked: "Old Li, how was your answer?"

Li Jianbin said: "Basically there are no problems. Even if we are stricter, after deducting some mistakes and missing steps in answering, there are still more than 90 points."

Xu Xingguo and the others were dumbfounded.

Then, Pang Xuelin started to do the inorganic chemistry test paper, this time it was faster, it was done in fifteen minutes!

Then, analytical chemistry, physical chemistry...

It only took one hour and ten minutes to complete all the four major basic chemistry questions, and none of them got a score lower than 90. Physical Chemistry, which is biased towards theoretical calculations, got a perfect score.

"No wonder everyone says that Professor Pang is a genius? I thought he was just extremely gifted in mathematics, but I didn't expect him to be so good at learning in other fields."

Chu Shilin on the side said with emotion.

Li Jianbin said: "That's true. Even if I answer these papers by myself, I may not be able to get such a high score, let alone finish it in more than an hour."

Although Li Jianbin has finished the exam papers, Li Jianbin has no intention of leaving.

He wants to see if Pang Xuelin can create a miracle today.

Next, Xuelin Pang began to answer questions about polymer chemistry, materials chemistry, and solid chemistry presented by Professor Tao Hong.

It took Pang Xuelin only one hour to complete all the three test papers, and none of them scored less than 90%.

The chemistry questions are almost done, and soon it will be the turn of physics.

University physics, material physics, material mechanics, structural mechanics.

Compared with those chemistry questions that require more memorization and elaboration, the calculation-based physics questions are easier for Pang Xuelin.

four exam papers,

It was also done within an hour, and three of them got full marks, and one made a small mistake and was deducted two points.

This time, everyone was convinced.

The outside world called Pang Xuelin the God of Learning. Xu Xingguo and the others thought it was exaggerated at first, but now it seems that this title is really well deserved.

Seeing that Pang Xuelin was a little unfinished, Xu Xingguo smiled and said: "Professor Pang, it's already past twelve noon, why don't we continue after dinner."

Pang Xuelin nodded and said, "Okay, then let's eat first."

Xu Xingguo sent someone to deliver the lunch to the meeting room directly. It took half an hour to finish eating, and Pang Xuelin began to answer the postgraduate test questions.

Material structure and properties, material thermodynamics and dynamics, field theory and tensor in material science...

Most of these papers are mainly about answering questions. When Pang Xuelin did it, he was a little slower than in the morning.

For example, one of the test questions about material thermodynamics and kinetics asked Pang Xuelin to describe the advantages and disadvantages of DSC curve and DTA curve and how to measure enthalpy.

It took Pang Xuelin nearly ten minutes to write a long paragraph on this question.

[The main difference between the two methods of DTA and DSC is that DTA measures the temperature difference ΔT between the sample and the reference, while DSC measures the heat flow rate (power difference) when the temperature difference between the sample and the reference is kept at zero. dH/dt. Although both curve shapes and quantitative correction methods are similar, their principles and curve equations are different...]

...

[Using an oxygen bomb calorimeter, the backside material is burned at a constant volume, so Qv is measured, that is, ΔcUm. According to ΔcHm(B, T)=ΔcUm(B, T)+ΔpV . If it is regarded as an ideal gas ΔpV=∑BνBRT, ignoring the influence of pressure on ΔcHm(B, T), we get

ΔcHm(B,T)=ΔcUm(B,T)+∑BνBRT

The enthalpy can be obtained by calculation. 】

...

But even so, the three papers only took Pang Xuelin an hour and a half.

In particular, tensor and field theory in material science involve a large number of differential equations and partial differential equations, which require a high level of mathematical foundation, but for Pang Xuelin, this paper is the simplest.

In the end, Pang Xuelin of tensor and field theory got full marks directly, and the other two papers were all above 90 points.

In the end, there are eight subjects left, which are the various knowledge points that need to be learned at the doctoral stage.

Computational materials, crystal growth, solid-state phase transition and performance effects, dislocation theory and material strengthening, photonic materials, energy materials, semiconductor physics, applications of electron microscopes in materials...

Fortunately, the amount of questions in these papers is not large, and each paper takes an average of 20 minutes.

At 5:30 in the afternoon, Pang Xuelin finished answering all the subjects.

Xu Xingguo finished reading the answers to the last paper, and said to Li Jianbin and others, "What do you think?"

Li Jianbin smiled wryly: "I have no other words to describe it other than God."

Tao Hong nodded and said: "I have seen it today. Some people asked me who is such a genius before. I still can't believe that Professor Pang can take care of other majors while achieving such great achievements in mathematics. I I can only be convinced! It is a pity that Professor Pang's main job is mathematics, if his main job is materials science, his achievements in the direction of materials may not be much worse than mathematics."