What does it mean that a man is not born every nine days, and a woman is not born at every ten?

That's how our hometown is, every nine is not born, which means that men are 9 years old, 19 years old, 29 years old, and 39 years old. Women are 10, 20, 30, 40 years old. Don't do a lot of business, don't invite guests.

It is exactly the mantissa of 9, 9, 19, 29, 39 ......But birthdays; Women are 10, 20, 30 ......But birthdays;

What does it mean that a man is not born every nine days, and a woman is not born at every ten?

It's a bit superstitious or clichéd.

Man Void 19 29 39... 99 is not a birthday; The woman is 20 30 40 90 100 but not a birthday.

Don't be so feudal and superstitious, okay? Is there a scientific basis?

Everyone in Hubei wants to celebrate their first birthday, tenth birthday, and then their birthday! This is talking about a big deal, inviting relatives and friends to the feast.

I usually buy a birthday cake every year to celebrate.

Hunan people are only one year old, ten years old, eat 100 days of wine, and are over thirty-six years old!

Hope, thank you.

Discharge cooling is another type of convection cooling. Unlike regenerative cooling, the coolant used for exhaust cooling absorbs heat to the thrust chamber and is discharged out of the combustion chamber instead of entering the combustion chamber to participate in combustion. Direct drain coolant reduces the thrust chamber specific impulse, so the coolant flow for drain cooling needs to be minimized while only using drain cooling at the outlet section of the nozzle that is relatively less heated.

There is also radiative cooling, in which the heat flow is transferred from the combustion products to the thrust chamber, and then the heat is radiated by the thrust chamber wall to the surrounding space. Radiative cooling is characterized by simplicity and small structural mass. It is mainly used in the extension section of large nozzles and the thrust chamber of small thrust engines using high-temperature resistant materials.

When cooling in the thrust chamber of the tissue, a relatively low temperature liquid or gas protective layer is established on the surface of the thrust chamber wall to reduce the heat flow to the thrust chamber wall, reduce the wall temperature, and achieve cooling. Internal cooling is mainly divided into three methods: internal cooling (shield cooling), membrane cooling and diaphoretic cooling of head tissues. After the internal cooling measures are adopted in the thrust chamber, the mixing ratio near the wall of the combustion chamber is different from the optimal mixing ratio in the central area (in most cases, the near-wall layer rich in fuel is used) due to the need to reduce the temperature of the protective layer, resulting in the uneven distribution of the mixing ratio along the cross-section of the combustion chamber, so that the combustion efficiency is reduced to a certain extent.

Membrane cooling is similar to shield cooling in that it cools the thrust chamber wall by establishing a uniform and stable coolant film or air film protective layer near the inner wall surface, except that the coolant used to establish the protective layer is not injected by the injector, but is supplied through a special cooling belt. The cooling band is generally arranged in a cross-section of the combustion chamber or the convergence section of the nozzle. There can be several cooling bands along the length of the combustion chamber.

In order to improve the stability of the membrane, the coolant often flows through the gaps or small holes in the cooling belts, and when sweating is used, the thrust chamber wall or part of the inner wall is made of porous material with a pore diameter of tens of microns. Porous materials are usually sintered with metal powders or pressed with metal mesh. In this case, the number of pores per unit area is increased by making the micropores in the material as evenly distributed as possible.

The liquid coolant penetrates into the inner wall, creating a protective film that reduces the density of the heat transferred to the wall. When the flow rate of liquid coolant used for sweat cooling is above a certain threshold, a liquid film is formed near the wall of the thrust chamber. When the coolant flow rate is below the critical flow, the inner wall temperature will be higher than the coolant boiling point at the current pressure, and some or all of the coolant will evaporate, forming an air film.

In addition to the above thermal protection, there are other thermal protection methods such as: ablation cooling, thermal insulation cooling, hot melt cooling and composite protection of chamber walls. 3. Thermal protection scheme of high enthalpy gas generator Based on the above methods and the actual situation, the thermal protection method of high enthalpy gas generator is obtained.

The combustion chamber of a high-enthalpy gas generator differs from that of a liquid rocket engine, eliminating the front thrust chamber part, making its structure simpler and more effective. Then, the thermal protection involved is the thermal protection part of the combustion chamber wall. As the fuel enters the combustion chamber, it quickly decomposes and releases large quantities.

1. There are "Qing Jiu" and "Qing Shi" in northern folklore, that is, men do not celebrate nine, and women do not celebrate ten. That is, "men celebrate the truth, women celebrate the void". The integer of "ten" is used to celebrate a man's birthday, and every ten years old is "one rank" also called "one ten".

The celebration of a woman's birthday is a year in advance, such as the 60th birthday is celebrated when You Wu Lao Wu is 19 years old, which is called "four ranks and nine ranks".

2. In Jiangnan folk customs, it is popular to celebrate "nine" and not "ten". The so-called "Celebration of Nine and Celebration of Ten" is to say that it is not a tenth birthday to be done, and it is necessary to do it every nine years in advance, and this custom is rumored to be related to the story of "Zhao Yan borrowing longevity" in the sixty-nine episodes of "Romance of the Three Kingdoms". Zhao Yan's longevity should have been nineteen years old, and after the divination of the gods, he sought to borrow his life, and the Southern Dipper Star Orange Chanjun, who was in charge of life, added a nine-character before Zhao Yan's life and death god ascended to "nineteen", and let him live to be ninety-nine years old.

It is also said that "do nine not ten" because "nine" has the same sound as "long", which means long-term, and ten is "ten is full, and full is loss".

For rural people, things such as the completion of a new house, getting married, and having a birthday are all big things! It's all a very traditional one! And "men don't celebrate nine, women don't celebrate ten" is about a rule for rural people to do longevity.