Open an aircraft carrier to fight against Japan

It turned out that there was a button on Lin Yuan's pen. Lin Yuan pressed it lightly, and a red light shot out from the pen and hit the screen. Everyone guessed: What is this red light?

It turns out that Lin Yuan’s pen is a laser pointer, which can emit red laser light. This kind of laser light is relatively low in intensity and will not cause damage to human eyes. In this region, sunlight contains this ultraviolet light."

"So, during the exhibition, we have to put the cultural relics in a dark room, and strictly control the light source. The light emitted by the light source must not contain ultraviolet light."

An expert below raised his hand and said: "Exhibition is for people to see, and ancient books also need to be read frequently, so that we can study the written information recorded on them. Look, I think I might as well go ahead and bury them in the ground!"

When other experts heard these words, they all snickered. Lin Yuan said: "We have an advanced and smart lamp, which can light up when someone approaches, so as to protect the cultural relics to the greatest extent! Here's a sample lamp for everyone."

After Lin Yuan finished speaking, he asked his entourage to take out a small black box with a delicate light bulb on it, and then Lin Yuan said, "Who is willing to come on stage and try this kind of light."

Elena's father, the curator of the Paris Municipal Library, stood up and said, "I'm here to see what's so special about this lamp."

When the curator came up to the stage, Lin Yuan pointed at the light bulb and said with a smile, "Please put your hand on the light bulb."

The curator asked: "What is this for?"

Lin Yuan smiled and said, "This is a smart lamp. If you put your hand on it, it means that someone is approaching the light bulb. Naturally, the light bulb will know and it will light up."

The curator hesitated and said: "Is it really so magical?" While talking, he put his hand on the light bulb, and saw a miraculous thing happen, the light bulb suddenly turned on!

In fact, the principle of this "smart lamp" is very simple. There is a magneto-sensitive resistor in the circuit. The resistance value of this resistor will change when the magnetic field changes. The human body itself is a huge electromagnetic field, so when the human body is close to the lamp At this time, the resistance value will become smaller, and the bulb will light up.

But the curator didn't know these reasons, so he was very surprised when he saw the light bulb turned on, and the people below were the same. Putting it back, the light bulb lit up, and the curator said to Lin Yuan, "It's really unexpected, you are still an inventor!"

Lin Yuan smiled and nodded, and said: "Actually, light is only one aspect that should be paid attention to when preserving, and there are many other important aspects. Now please bring up the batch of paper cultural relics, and I will show you how to preserve them." previous processing."

Two librarians brought up two glass cabinets. Lin Yuan took out a pair of white gloves from his pocket and put them on, saying: "The sweat on hands can corrode these papers, so when touching these papers, you must wear Put on your gloves."

Lin Yuan gently picked up a piece of paper with no writing on it with tweezers, put it on the table, and said: "I will put this paper under the projector in a while, and everyone can view it from the screen during my operation." I saw it on the Internet, but the light from the projector can do a lot of damage to the paper, so I chose a piece of paper without words."

Lin Yuan put the piece of paper on the projection area of ​​the projector, and an enlarged image of the paper appeared on the big screen immediately. Lin Yuan pointed to a spot of mud on it and said, "Paper is made of cellulose. The existence of such mud spots will reduce the mechanical strength of the paper and increase the probability of mechanical damage to the paper, so they must be removed."

Lin Yuan called his assistant over, set up a shelf on the table, and put an alcohol lamp under it. When the assistant was building the shelf, Lin Yuan said, "How should the mud spots be removed? I believe everyone should have some experience and experience. The easiest way is to wash with water, but you should test the words and pictures written on the paper before washing, if you find that the color will fade during washing, then the washing method cannot be used.”

Lin Yuan said: "I'm here to show you how to remove mud spots on cultural relics that cannot be washed with water." Lin Yuan turned around and pointed to the shelf. Below it was an alcohol lamp. A shelf made of wire, with cotton on it.

Lin Yuan took a bottle of liquid from his assistant, poured it into the sink, and said, "This is not water, but something called trichlorethylene, which cannot be produced in your country yet." In fact, Lin Yuan was lying. , This kind of thing is actually taken from the Curies.

Lin Yuan poured the trichlorethylene into the sink, then put the paper on the cotton, lit the alcohol lamp, after a while, a strange fragrance wafted out, Lin Yuan said to the assistant: "Go and open the doors and windows, this kind of The gas is poisonous, don't inhale too much."

Lin Yuan saw that the cleaning was almost done, so he turned off the alcohol lamp, and then Lin Yuan picked up the paper, and saw that it was completely new, and the mud spots were gone. Lin Yuan asked his assistant to remove the shelf, and then took the He took out a beaker, filled it with water, took out a small piece of paper and put it in, and said, "What I want to do now is to test the acidity and alkalinity of the paper."

"I have said more than once that paper is cellulose, and acidity can accelerate the hydrolysis of cellulose, so it is very important to remove the acidity of paper cultural relics." Lin Yuan took out a note and said, "This is A piece of test paper, if the paper becomes acidic, this test paper will turn red, unlike the test paper used in ordinary chemical experiments, the sensitivity of this test paper is very high!"

Lin Yuan put the test paper on the table and saw that the paper in the beaker had turned into confetti, so he used a glass rod to dip some liquid onto the test paper, and the test paper immediately turned bright red. Lin Yuan picked up the test paper and said yes Everyone said: "As you can see, the test paper turns red, which means that this paper is acidic. Now we need to find a way to make it alkaline."

Lin Yuan took another bottle from his assistant and said, "The bottle contains ammonia water. I use this to make the paper alkaline." Lin Yuan poured the ammonia water into the sink, Immediately, an unpleasant smell wafted out. Lin Yuan fumigated for a while, and then took a small piece from the paper. This time, the test was carried out, and the paper had already become alkaline.

Lin Yuan looked at the surprised expressions of the crowd, and knew that they were almost overwhelmed by what he had demonstrated, so he smiled and said, "Why don't we discuss it for a while?"

Accompanied by Lin Yuan's voice, there was a lively discussion below. The curator said to an old man beside him: "What is the thing this person demonstrated? Is there any scientific reason?"

The old man said excitedly: "This young man is really amazing. The effect of acid on cultural relics he mentioned is something I have studied all my life, and he can actually know it!"