I am devoted to scientific research, but you want to trick me into having a love relationship?

Chapter 494 Gradually Feeling the Joy of Finance
Xu Qingzhou put the manuscript aside. There was no rush for the battery experiment. He planned to finish synthesizing Song Yao's high-frequency signal first.

As he got to know her more deeply, he could vaguely understand Song Yao's happiness.

Just like the saying: Using a fulcrum, you can move the earth.

By identifying the laws of economics, you can paralyze a huge business empire, which is very fulfilling.

He had finished most of the content during the day in the library.

However, it was found that the Fourier transform has limitations. If the Tesla price fluctuation cycle changes suddenly, such as 10 seconds → 5 seconds, the Fourier transform cannot capture the dynamics, and limited sampling will cause spectrum leakage.

If you want to make it more perfect, you have to use the next step of wavelet analysis to strengthen it.

The time and intensity of such events can be accurately captured through the time-frequency localization capabilities of Morlet wavelet or Daubechies wavelet.

To put it in a more vivid way, it is like using scissors to cut an infinitely long tape of ocean waves. Finite sampling is like violently cutting the ocean wave recording, destroying the natural continuity of the signal, causing the pure "wave crest" in the frequency domain to be polluted by the messy "waves". The role of the windowing function is like using gradient scissors to gently cut the recording, making the starting point and the end point transition smoothly and reducing noise.

Hey~
Just as the two were busy with their own things, the phone on Xu Qingzhou's desk rang.

After glancing at the name, he answered the call and greeted with a smile: "Good morning, Professor Gu."

"Professor Xu, I hope I didn't disturb you." Gu Zhizhong asked with a smile.

"Look at what you said, how come you have time to answer your phone?"

"I heard that you are doing experiments on superconducting films?"

Xu Qingzhou was not surprised that Professor Gu Zhizhong knew his research direction. As the saying goes, academics are all in the same circle.

Especially for an old professor like Gu Zhizhong who has many students all over the world, it is easy to find out something.

He nodded and said, "Yes, I want to make substrate-free NbSn thin films based on ALD and graphene substrate."

"Tsk tsk, you are still the same as before, always doing things that are unexpected."

Gu Zhizhong sighed, paused, and said, "From your looks, you won't want to study theoretical mathematics when you return to China, right?"

"You know me well enough to be restless."

Xu Qingzhou said with a smile.

Experiments on superconducting films have already begun. If we cannot complete it this year, we will have to bring the project back home.

Future Words
energy.

Xu Qingzhou's research will move in this direction, and at the same time he can also simultaneously advance his previous experiments in quantum mechanics.

"That's good too. You should probably consider what kind of research you want to do. Half a year is not too short or too long. You should think about it in advance. Laboratory equipment, venue, location, all of these require time to arrange."

Hearing this, Xu Qingzhou immediately understood and smiled: "Please keep me informed."

"Hey, the school is having a meeting, and someone did mention something about you coming back. I'll discuss it with Lao Chu and tell you first. Public is public, private is private, and you still have to make the request you should make."

"Okay, thank you and Professor Chu for your reminder. I will consider it."

On October 10th, the breath of autumn becomes stronger.

After 3 hours of electrochemical stripping, which took one and a half months, the first sample finally appeared. Next, Xu Qingzhou spent another 7 days to make an appointment for shared equipment and complete the characterization test.

There is a test report from the shared laboratory on the desk in the office.

[Sample number: Nb3Sn_ALD_Graphene_001]

Structural characterization results

Transmission electron microscopy (TEM) analysis

Grain size distribution:

Average value: 85 nm
Range: 30–200 nm (standard deviation ±40 nm) Grain boundary width: 3–8 nm (microcracks exist in some areas, with a width of ≈2 nm). 】

【X-ray diffraction (XRD)

Main peak location:

（200）晶面：2θ=32.5°（强度≈1500 cps，半高宽FWHM=0.3°）。

(210) crystal plane: 2θ=46.8° (intensity ≈800 cps).

Impurity phase detection:
SnO peak: 2θ=26.5° (intensity ≈120 cps, proportion ≈3.5%). 】

Xu Qingzhou and Carson looked through the data in front of them.

Sun Simin and Mars both rested their chins on their hands, looking uninterested. The condition of the samples was not satisfactory.

Xu Qingzhou was quite relaxed. He jokingly said to Sun Simin and Mars, "Cheer up. At least, we have reached the laboratory level."

Judging from the current data, the performance of the sample is roughly the same as the finished product produced by James' team four years ago.

It is even more different from the ideal performance pursued by major laboratories today. To put it in a more vivid way, this is equivalent to the performance gap between the antique phone equipped with Snapdragon 2018 in 845 and the concept phone with 2025nm photonic quantum SOC in 3.

Sun Simin nodded and took a deep breath. "Although I am disappointed, it feels amazing that I personally participated in the production of a superconducting film."

"Wake up, we are just doing odd jobs."

Mars added from the side.

After getting familiar with each other, Sun Simin was no longer restrained as before, and pouted her lips to refute: "Be more confident, doing odd jobs is also an experiment."

“We completed what Professor James and his team spent two years on in just one month.”

Carson was mentally strong, flipping through the report: "But... the grain size is a bit complicated, from 30 to 200 nanometers? It's like putting kindergarten kids and NBA players in the same locker room."

"There are many areas that need to be optimized and improved. What comes next is the key."

Xu Qingzhou tapped his fingertips and assigned tasks: "Carson, next Monday, you will continue the experiment, using Sn(NEt) to replace Sn(CH), combined with in-situ H plasma reduction, with the goal of reducing the SnO content from 3.5% to <1%."

He said in a deep voice: "I will analyze the current data and hope it will be helpful for our experiment."

"No problem." Carson nodded.

Xu Qingzhou closed the report and said with a smile: "Ou Ke, everyone has worked hard. The bonus has been deposited into your card. Relax for the next two days."

“The boss is awesome!”

Carson gave him a thumbs-up.

Xu Qingzhou said no more, wished everyone a happy weekend, asked everyone to go home from get off work, and left to cover the rest.

Carson and the others didn't stay long and packed up their things and left.

Xu Qingzhou checked all the instruments, locked the door and left the laboratory. Just as he reached the intersection, he saw the scene across the flower bed and his steps froze.

There are two protagonists, one of whom is the strange old man, and Carson is also there.

The old man held a stack of information in his arms and looked at Carson with burning eyes.

Carson's expression was equally strange. This carefree California youth actually had some shyness on his face.

The atmosphere was a little subtle and a little anxious.

Xu Qingzhou had a strange expression on his face. After hesitating for a moment, he decided to change the route.

Damn, there's something wrong with these two.

(I discussed it with the editor and changed the name. Let’s try it out. It’s a bit short, so you may need some time to get used to it.)
(End of this chapter)