Rolling and eating noodles have a long history, but why do you need to roll the noodles from the surrounding area, why do you roll the noodles, and why do you need to add cold water when you cook the noodles?
Everyone does it, but probably few people know why...
Recently, Zhang Yahui, a Ph.D. of Western Polytechnic University who studied in France, wrote a paper "Nonlinear mechanics and thermodynamic principles in the process of hand-rolled noodles", which answered these questions seriously!
Ph.D. from Northwestern Polytechnical University in France wrote a thesis explaining "the scientific principle of rolling noodles"
Why do you want to "xíng noodles" (after mixing the noodles, a rough-structured dough is formed first, and the dough cannot be rolled out yet, and it takes about 10 minutes to form)?
According to the analysis of the article, after the aging treatment, the water can diffuse evenly, and its plastic properties are greatly improved.
Schematic diagram of aging forming process
Why roll the dough?
The graphic analysis of the article shows that the convoluted dough at a certain rolling moment is divided along the normal direction of the cutting board. The thickness of the rolled area on the left side of the normal line is thinner, and the thickness of the unrolled area on the right side of the normal line is thicker; Similar to the rolling method, the unrolled area is compressed and thinned in the contact area in the normal direction. According to the constant volume condition, the material is stretched forward, so as to achieve the purpose of rolling. Because the convolution rolling method has the advantages of multi-level rolling and multi-period circulation, the rolling efficiency is greatly improved.
Flat rolling method
Convolution rolling method
Why do you need to add cold water after boiling noodles?
The essence of cooking noodles is the heat exchange between the noodles and the environmental medium, so that the noodles are cooked from raw materials. The heat transfer efficiency of liquid is much greater than that of gas. In the state of vigorous boiling, the heat transfer efficiency of the mixed medium of noodles and water gas will decrease. Therefore, adding a small amount of cold water to slow down the degree of boiling helps to cook the noodles as quickly as possible.
Schematic diagram of heat exchange medium during noodle cooking
Author of the paper: I wrote this paper just for humor
The author of the paper, Zhang Yahui, studied at Northwestern Polytechnical University for undergraduate and postgraduate studies, majoring in aircraft design. Three years ago, he went to Paris-Saclay University to study for a doctorate.
"Actually, my original intention was to be humorous. Undergraduate students understand these scientific principles." Zhang Yahui said that this article is not strictly a paper, but a popular science article.
Zhang Yahui said that many people in the scientific research circle are doing similar research. Some people analyze how wearing long johns is better for keeping warm, and some people study the mechanics of the frequency of the ponytail swinging when a girl is running. This kind of research starts from daily themes and uses professional research methods. For quantitative research, the value lies in scientific research methods.
What do you think about every day?
For many people, the world of Xueba has always been uncharted territory.
What are the scholars who are immersed in scientific research thinking? The following "Divine Essays" might make you laugh and kneel...
"Effect of star anise on the volatile flavor of braised chicken and its mechanism of action"
This 80,000-word dissertation expounding the relationship between star anise and braised chicken is the doctoral dissertation of Sun Lingxia, a female doctor at Shaanxi Normal University. Sun Lingxia said that the paper was studying traditional braised pork products with sauce.
Netizen: "As expected of the Shaanxi University of Food and Drink, a braised chicken can be studied so professionally..."
"Research on the Function of "Haha" in Network Conversation"
The supervisor of this master's thesis believes that the thesis is very meaningful from the perspective of modern linguistics, and it discusses the different meanings of the phrase "hehe" expressed on the Internet.
On the winning strategy of rock paper scissors
An interdisciplinary team composed of Zhejiang University, Zhejiang Gongshang University, and the Chinese Academy of Sciences said that the winning strategy of "rock, scissors, and paper" was discovered through experiments.
The study found that under certain circumstances, if you win, you will choose to keep the strategy you just won. If you lose, you will change the name order of "rock paper scissors", and if you are flat, you will follow the reverse order of "rock paper scissors". change.
This study, which was previously derided as "fed up", was selected as the "Best of 2014 by MIT Technology Review".
How to grab WeChat red envelopes to be "the best luck"?
Speaking of interesting academic masters, we can't help but mention Bi Xiaotian, a "Internet celebrity" Ph.D. from the Department of Chemical Engineering of Tsinghua University.
He sent himself 50 million red envelopes, and found that the probability of the best luck decreases in order when 5 people grab it.
I sent myself another 200 million red envelopes, and came to the conclusion: when there are more people grabbing red envelopes, the more you go, the higher the probability of getting the best luck.
How to keep warm scientifically
In order to think about this problem, Bi Dao established a model of heat transfer.
After calculation, it is found that when you wear the autumn clothes outside and the windbreaker inside, your heat dissipation power is a full 2W smaller than that of "the autumn clothes inside the windbreaker outside".
Therefore, the scientific way to wear is: wear autumn clothes outside...
Are potato chips still edible if they fall on the ground?
Director Bi drew a diagram in Matlab, simulating the appearance of a potato chip falling on the ground.
When an arc surface falls on a plane, it is a tangential contact, that is, the two surfaces actually intersect on a line.
Is a potato chip dirty on the floor? dirty. How dirty is it? A line is dirty. What is the area of a line? equal to zero. So not dirty.
It doesn't matter the other way around, even if you plug it upright on the ground, its connection will change from two points to one point.
A line, two points, and a point have zero area. This is called the tangent eatable theorem. In other words, things like potato chips can be eaten no matter what.
∑ Editor | Gemini
Source | China Youth Daily (ID: zqbcyol )