The heavy snow continued until late at night before stopping for a while.
Conan sat alone in the corridor wrapped in a blanket.
Think back to a few hours ago.
When he was thrown out of the guest room by someone, he vaguely heard Dr. A Li's attempt to smooth things over.
Because of the door panel, he didn't hear the content very clearly, but... the conversation between the two parties didn't last long, and the ending was obvious. The doctor was persuaded by Geng Yi.
Set fire to the B&B to silence everyone...
Well, judging from how well Ryoko Himuro protects her sister, it's not impossible.
Brother Geng, really, why didn’t you tell me earlier? He wanted to wait until the police arrived at the scene the next day before revealing the truth...
Alas, it was my own carelessness, and I actually started talking about the ice plate in the entrance hall, and let them hear it while they were still in the restaurant.
Conan kept scratching his head, reflecting on his mistakes and feeling relieved to have solved the mystery.
It turns out that Brother Genichi discovered the hidden pills on Miss Juri in advance, so he was able to identify the other party as the murderer of Mr. Fujita.
You must have heard the sound of pills rubbing in your pocket, right? Did those two pills fall out accidentally?
According to Ms. Juri, she fell on Brother Genichi on purpose at the time, wanting to see Mr. Fujita's reaction in order to make a final decision. Unexpectedly... she actually ignored so many details.
Time passed quietly in his thoughts.
The police arrived at the scene just after dawn.
I don’t know whether Ye Gengyi was too cautious, or whether the three sisters in the ice room had the intention of setting fire, but were worried about these smart and quick-thinking residents. In short, the imagined fire did not happen.
Himuro Juri also confessed to the crime.
Since the local criminal police were present at the scene, Ye Gengyi and his party did not have the privilege of suspending or exempting the transcript.
Completed check-out procedures.
After driving to the town's police station again, this outing organized by Dr. Ali to thank his three children came to an end.
…
Return to 2-chome.
Ye Gengyi came to the basement and contacted Kuroba Kaito on the phone.
In the other party's complaint, "Brother, no matter how anxious you are, I can't make the freighter fly," Ye Gengyi realized that even though it jumped to the snowing season inexplicably, only one day had passed.
Well...as long as those 'live' fungus materials don't pass the shelf life.
After getting the answer he wanted, Ye Geng directly asked him to give his mobile phone to Miyano Akemi, and sent a few photos through an encrypted channel, asking the other party to "look at the girl in the cloud", and at the same time gave him the usual warning not to do it. Nothing extra, otherwise the next time the photo will probably appear, only words like your sister’s head will appear...
"..."
End the call.
The silence in the basement did not last long.
However, what surprised Ye Gengyi was that the person who came in this time was not a certain Loli who would help brew coffee from time to time, but Dr. A Li who brought research materials.
"The power system of a four-axis fan-wing drone?"
"Yes... I received an invitation to attend a well-known press conference in the industry in a while. The motor for the fan wings is modified from a skateboard, but after adding a solar module to the drone, the flight stability will become Very bad.”
Dr. Ali opened the folder and showed the disassembly diagram and parameters of each component:
"I have calculated many times and feel that the problem may be in the power system."
"Okay, let me take a look."
Ye Gengyi took the manuscript, flipped through it page by page, and asked after dozens of minutes:
"What about the real thing?"
"Well... I did a test flight before I went to London, and then... I fell into the river."
Dr. A Li scratched his face in embarrassment: "Although it was finally fished out, it can no longer fly because water entered the machine. Do you want to see that?"
"Bring it here."
It can be optimized on the one hand, but just looking at the parameters of this document, Ye Gengyi did not find any problems.
Dr. Ali ran to the warehouse in the yard to get the drone.
Ye Gengyi cleaned up the operating table and moved the disassembly tool box up.
The battery and circuit board are damaged, the motor shaft is penetrated by debris, and the fan blades are deformed.
No wonder it's not repaired... Ye Gengyi changed his mind: "Doctor, do you have a backup copy of the flight records?"
"Yes, it's inside." Dr. Ali took out the control handle.
"Let's simulate it first."
Ye Gengyi connected the data cable and connected the device to the computer.
The two of them are busy here.
During this period, Haihara Ai also brought a small stool over and stood on it to watch. Since the results of the simulation tests always showed normal, she couldn't help but give an opinion:
"Could it be a problem with the airflow? When the doctor was returning home, the drone suddenly shook and fell into the river."
In order to find an open space outdoors, the two of them went to Tsumutsu River.
There is also a kite competition held there, so it is not impossible for the drone to suddenly encounter strong airflow.
It's just that... a chemist actually talked about aerodynamics with a Ph.D. in physics?
Ye Geng waved his hand to chase people away:
"Make a pot of coffee and watch your cartoon."
Haibara Ai:"……"
Do you think they are all science majors and should look down on them as cartoons? Humph! When you come to me to study biology!
She curled her lips angrily, then picked up the coffee pot on the table and left.
"..."
Dr. A Li stood aside and stopped talking.
However, in his understanding, Ye Gengyi did not know Xiao Ai's identity, so it was hard to say anything.
Here, the traitors of the organization who were not professionally aligned were sent away.
Ye Gengyi continued to be distracted, checking simulation data and thinking about other possibilities.
Dr. Ali has built drones before. Although they are not 'professional' yet, they are definitely not just 'flyable'.
If there is a problem when executing the return command, could it be due to the channel? The remote controller sends the command and the drone receives it accurately, but it is not reflected in the process because of interference.
Ye Gengyi clarified his thoughts and began to modify the simulated flight test instructions. After several more tests:
"Found it, the problem is with the solar panels."
As he spoke, he called up the test data.
"Eh? It's the electric field and the magnetic field that interfere with each other..." Dr. A Li also discovered the problem at a glance.
"Well, unconverted electric fields and magnetic fields will not interfere with each other, but encrypted channels are different. If you don't consider hardware issues, let's start adjusting from the programming..." Ye Gengyi gave a suggestion.
"It can only be this way……"
Dr. A Li raised his forehead and sighed.
The photovoltaic effect of solar power generation is the basic working principle of solar cells. This effect refers to the phenomenon that when light shines on a semiconductor material, it causes the separation of charges and the flow of electric current.
Specifically, solar cells are typically constructed from two layers of different types of semiconductor materials, typically silicon. One layer is doped to form a P-type semiconductor, and the other layer is doped to form an N-type semiconductor. P-type semiconductor materials are doped with impurities, which contain positive charges, called holes; N-type semiconductor materials are also doped with impurities, which are negatively charged electrons.
When sunlight hits a solar cell, photons excite the electrons in it, causing them to gain energy and jump to a higher energy level. These photoexcited electrons move along the band structure of the semiconductor and form an electric field across the interface.
Due to the electric field formed between the P-type semiconductor and the N-type semiconductor, the unexcited electrons and holes will be separated by the strong electric field, causing the electrons and holes to move to the two ports. This creates an electric current, and the flowing electrons and holes create a potential difference called volts.
Through a circuit connected across the solar cell, the photovoltaic effect can be converted into usable electrical energy that can be used to drive electronic devices or be stored in a battery for later use.
This is an application that has been practiced on solar skateboards, but Dr. Ali ignored the problem of wireless control of drones.
There are two ways to solve it: difficult and easy.
The difficult thing is to distinguish between the conversion of radio waves and electrical energy through programming.
It's simple, just remove the solar panel.
