Is the weather so hot now, can it be concentrated like heating?| NO.322

by yumyulack

answer:

It is mainly water, but there may be bacteria, dust, etc., so air -conditioning water is generally not clean and unable to drink.

The air -conditioning water comes from the evaporator of the inner air conditioner. Here, the low -temperature and low -pressure refrigerant liquid evaporates the refrigerant gas. Due to the heat absorption of the process, it can absorb the calories indoor. This is part of the principle of air -conditioning refrigeration. When the refrigerant evaporates heat, the surface temperature of the evaporator will be reduced, and the interior water vapor condenses here, condenses into small water droplets, and is discharged after being collected. This is air conditioning water.

From the principle point of view, there seems to be nothing clean in air conditioning water. In fact, otherwise, air -conditioning water may be very dirty, because the water vapor in the air is difficult to say that it is clean. The air is mixed with a large amount of inhaled particulate matter, bacteria, viruses, etc. At the same time, air conditioners can also arouse dust from the indoor air, dissolved in air conditioning water. Of course, the family should not have floating dust. The long -term wet state of the evaporator itself is also easy to breed bacteria, especially if the home does not regularly clean the evaporator, the "resident" above is more difficult to imagine. In summary, the air -conditioning water is far from that you think so clean and unable to drink.

Reference materials:

The two major parts of the central air -conditioning system knowledge: evaporator and condenser

Is the water flowing from the air conditioner?

By Frost Bai

Q.E.D.Q2 Why is such a short mobile lens that can have tens of millimeters equivalent? What is the relationship between equivalent focal length and actual focal length? By Anonymous Answer:

In order to clarify the problem, we first retest where this doubt is. The so -called short of the lens is the short frame of the lens. The focal length of the lens refers to the parallel light of me to the lens. After refracting, they converge from the distance of the lens, which is determined by the unevenness of the lens. These two lengths are related, because junior high school physics tells us that the real image distance of the convex lens is double the focal length. If the image of the mobile phone lens is clearly hitting the sensor, it means that I need to be with and. The space with equivalent focal length is placed in the lens and sensors.

So the question comes, how does less than 1cm thick mobile phones plug dozens of millimeters equivalent to the lens? In fact, this is because the equivalent focal length is not the actual focal length. Of course, the actual focal length of the mobile phone lens is still a few millimeters, which is equivalent to the distance from its sensor. Of course, some mobile phones are made into a subtained lens, which can extend the actual focal length to more than ten millimeters.

The equivalent focal length represents the parameters of the shooting angle range used to characterize the lens. The shooting range of a camera module is determined by the focal length and sensor size of the lens. The larger the sensor, the shorter the focal length, and the wider the range of the shooting. The smaller the sensor, the longer the focal length The larger the place. The equivalent focal length is to unify the size of the sensor to a 35mm full -frame sensor size, and then keep the range of the screen unchanged, depending on how long the required lens is.

For example, a mobile phone manufacturer promotes its main photography equivalent focal length of 30mm, which means that the range range that this lens can shoot is equivalent to using a 30mm focal length lens and a 35mm full -frame sensor (36mm × 24mm) to shoot. Scope. And if the actual size of the imaging sensor of the mobile phone is 1/1.7 inches (7.83mm × 5.22mm, because of the wonderful historical reasons of 1 -inch = 16mm), then the actual focal length is 30 ÷ 36 × 7.83 = 6.525 MM, you can still plug into a 8.6mm thick mobile phone. If you can't stop it, let the camera stand a little bit ╮ (╯ ▽ ╰) ╭

And if the mobile phone manufacturer promotes it to have an equivalent focal length of 120mm, a permanent telephoto lens, using a 1/2 -inch (6.66mm × 4.44mm) sensor, then the actual focal length is 120 ÷ 36 × 6.66 = 22.2mm. This length is not to be solved by the camera. You have to fold the light path and let it lie down in the sensor. This means "implication".

By Muyu

Q.E.D.Q3 I have a magical question: Why does the southern region not concentrate? Because from the perspective of which aspect, this seems to be a higher efficiency solution. And compared to the central heating in the north, the heat loss of cold supply should be smaller at the same distance? by mithrandir Answer:

Interesting ideas! And from the perspective of environmental temperature differences, in theory, thermal heat loss is indeed smaller than heating. Now Shenzhen, Zhuhai, Wuhan, Jinan and other cities have also turned this idea into reality [1-3]. The specific practice is similar to the heating tube, but the transmitted things have changed from hot water to cold water.

But why is the concentration of concentration? From the perspective of the R & D terminal, developing developed countries with centralized heating are basically cold. Most of the tropical countries are still developing countries, and the level of R & D is limited. On the other hand, the heating or cooling is liquid water, and its temperature is limited between the coagulation point and the boiling point. Generally, the temperature of the hot water in the room can reach 75 ° C, and it will be reduced to 50 ° C after returning. It can be seen that the efficiency of cooling is not as good as heating. To achieve the effect of "summer cool", the water flow must be two or three times that of the "winter heating" effect. However, there are fewer resources consumed by concentrated cold supply than single households using air conditioners. With the general trend of energy conservation and emission reduction, I believe that this technology will continue to advance and gradually benefit more people.

Reference materials:

Qianhai world-class "big air conditioning" 24-hour concentration of cold-government affairs (sz.gov.cn)

Explore the concentrated cooling system of Qianhai area in the city's energy conservation system how to "debut" in urban energy conservation

"Super Central Air Conditioning" is here! This area in Wuhan will concentrate cold supply

National Standard: Heating Heating Solving Scattering Methods | GB/T 13754-2017

By Muyu

Q.E.D.Q4 How to identify the finger joint touch of the mobile phone screen? By Green Whirlwind 答️ Answer:

Refers to joint touch technology invented by Silicon Valley's QEEXO company in 2012. At that time, the scheme was in the screen in the screen. The vibration amplitude generated by the collision screen by different objects was measured to determine whether the belly, nails or joints were knocking on the screen.

In 2015, Huawei reached cooperation with this company and began to vigorously promote this technology on the screen of the mobile phone. In the patented files [3,4] they published, the audio difference between the joints and the fingers of the finger stomach taps the screen in detail. Every time the touch -screen incident occurs, the mobile phone collects the sound and vibration of this incident, analyzes their spectrum, and compares with the built -in sound spectrum to distinguish which part of the screen touches the screen.

You can see that the sound of the finger belly in the spectrum is low, and the sound of the joints is more sharp. In addition, the sound spectrum of the joints and nails is very similar, so when the early algorithm is not smart enough, it is really easy to misunderstand the nail touch into a finger joint.

It is worth mentioning that in the scheme announced by Qeexo, it also mentioned the use of the touch area and strength to assist identification. However, this is not mentioned in the plan announced by Huawei.

Now when you know this principle, you can try to cheat your mobile phone, such as touching the back cover or frame of the mobile phone with the joint of the other hand with the joints of the belly, or use the nails to stab the mobile phone screen, or or Put another mobile phone next to it, touch the screen of the machine with your fingers, touch another mobile phone with your finger joint ... Welcome to share your tidy mobile phone experience in the comments area [DOGE]

Reference materials:

QEEXO official introduction video

Qeexo's Chinese introduction video

System and method patent announcement number for dual -finger joint touch screen control CN107924280A

USING CAPACITIVE Images for Touch Type classification patent announcement number US 2015/0242009 A1

By Muyu

Q.E.D.Q5 看到 Why do we see most of the clouds below and the upper is bulging? BY South Answer:

This bottom is flat, and the cloudy clouds are called accumulated clouds. We have intermediated this cloud in NO.314 Q4. Students who have no impression can click in and review it. However, it was divided at the height of the clouds at the time, and now we are divided by the form of the cloud. Correspondingly, the shape is slender, and the upper and lower ends are almost called laminar clouds.

The reason why Jiyun is relatively flat is because there is something called "lifting the condensate height" in the atmosphere. The water vapor on the ground is lighter than the air. During its floating process, the air pressure decreases, and the volume will gradually swell. This expansion will be reduced to the outside world, and its own temperature will be reduced. In addition, the atmospheric temperature decreases with the height. In this way, the water vapor will continue to cool. After a certain altitude height, the temperature will drop to the solidarity point of the water under the corresponding air pressure, so it will be liquey into small water droplets.

As for the bulge at the top, the water vapor and the nearby dry air occurred. Without strong convection, there will be a relatively flat layer -shaped cloud.

Reference materials:

China Science Popularization Expo at the Atmospheric Science Museum (Kepu.net.cn)

Why are there? -Youtube

By Muyu

Q.E.D.Q6 In addition to the plane mirror, is there an optical system that can be perfectly imaged? BY stealing the dog's bones:

nothing now.

The optical system of imaging can be divided into two categories: plane mirror reflection and lens refraction, and then a unique one can also open a small -hole imaging and interference holographic imaging. In the type of reflection of the plane mirror, the concave mirror and convex mirror will obviously produce distortion like Haha mirrors. Only the flat mirror can be perfectly imaged. In the type of lens refraction, the light will inevitably dispersal the geoisage and cause the color difference. There will also be ball differences, comedies, scattered, fields, and distortion. There is always a refracted optical system that becomes imperfect. In the small hole imaging, as long as the size of the hole is not infinite, it will inevitably diffuse. In the holographic imaging, the interference effect of different colors (wavelength) light is different, so the current mature holographic imaging still has to be implemented with monochrome laser. In addition, it is impossible These will produce aberrations.

Let's take a look at how the aberration in the lens imaging system just mentioned is specifically produced.

Ball difference: Lights of different inclination angles on the light shaft did not gather again after the lens, but converged into a concentric circle;

Comet: Different inclination angle sizes (relative to the center of the lens) outside the light shaft did not gather again after the lens was passed through the lens.

Like San: For the light from the point of light outside the light shaft, even if the incision angle is the same, as long as the direction is different, their convergence points are still different. The distance is called like scattered.

Field song: The deviation of the imaging of a single point before. The venue considers a flat object. The point on it will no longer be kept on a plane after imaging, but it will be used to form a curved surface at different elements. Use a plane sensor to receive it, and you will find that each point cannot be clearly imaged at the same time.

Frequency: At different distances between the light shaft, even if it can be clearly imaged, the magnification of the image is inconsistent.

Polysis: The light of different colors on the point of the light shaft will imagine the color difference in different positions, forming position color difference. The distance between different colors from the point outside the light shaft is different from the distance from the light shaft after the imaging, forming a differential color difference.

There are so many debuffs in the lens, and it seems that the plane mirror is still true.

By Muyu

Q.E.D.Q7 According to the theory of Dabro's material waves, can people also diffuse? BY energy conservation:

Theoretically, it is possible, but it exceeds the limit of human detection capabilities.

Based on the relationship between Debelo, people's material wavelengths can be estimated. In order to calculate the simple calculation, assuming that the human weight is 66.26kg (the data is reasonable, but it is strange), the exercise speed is 10m/s, then the ，得到人体的物质波长. As a comparison, the diameter of an atom is about Differential device-the detection limit capacity of the laser interference of gravitational waves (LIGO) — the detection limit capacity is . In other words, for any detector currently made by human beings, the position of a person is an accurate reading, and there is no probability distribution.

In high school physics exercises, the material wavelength of various typical objects should be mentioned. A slightly macro physical particle, the material wavelength can be ignored. The maximum of objects that can really see material waves by humans are < g data-mml-node = "math"> This kind of "slightly larger" molecule. Reference materials:

Ligo

BY Tibetan

Q.E.D.Q8 Quantum entanglement why can it exceed the speed of light? By Nine Answer:

Quantum entanglement can "exceed the speed of light" because it is not interactive and does not pass any information.

Let me give an indescribable example. There was a red and blue pen in your pen holder. He took a piece and stuffed it into his pocket and hit a spacecraft to Pluto. After you got into the pocket, you found that it was a red pen, so you immediately knew, oh The blue pen is still in the pen holder. But at this time you are billions of kilometers away from the blue pen. Is this super light?

If you understand the above example, we will become easier when we are physically physically. In the multi -particle system, if the nature of each particle cannot be described alone, it can only describe the nature of the overall system, which is called entanglement. For example, two particles have two states of each particle.

Now we let them be in < / g> /g> /> < /g> < /g> "> < /g> At this time, we will find that there is no way to describe the state of A or B alone,

Because if A is in , then B is also in < /g> < /g> state, the two are related, so we say that they are in quantum quantum Entanglement. If these two particles are on the earth and Pluto, the Pluto observes particle B and found that it is in < /g> < /g> state, so know that the particles on the earth are also , but this is not interactive, nor can it pass any information. Because whether it is Pluto or the Earthman, they do not know whether the particles have been observed by the other party and are still entangled before observing, and the quantum entanglement cannot be copied. So this is the same as the example of the red and blue pens above. People on the earth will not know that you forget the blue pen at home because you are in the pocket of Pluto. In other words, quantum entanglement is not interactive, cannot convey information, or even has nothing to do with distance. You can say that it is super light speed, but this ultra -light speed does not have practical significance. It just tells us that quantum is non -regional. The theory of relativity is just to say that the speed of quality particles and the transmission speed of interaction cannot exceed the speed of vacuum light. So quantum entanglement this ultra -light speed does not violate the theory of relativity. By the way, quantum entanglement can be used to pass the quantum state, but it still relies on the classic information transmission method, and the original quantum state after passing will be destroyed. Interested readers can understand the quantum invisible state.

by fiufiu

Q.E.D.#Voting#q q q q q

Frost White, Pastoral Fish, Tibetan idiot, fiufiu,

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#The last issue is also wonderful

Edit: Mu Zi

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