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Advantages and disadvantages of ultraviolet rays
May , 12 2020
UV advantages: 1) disinfection and sterilization; 2) promote bone development; 3) it is good for blood color; 4) it can occasionally treat some skin diseases; 5) it can promote mineral metabolism and vitamin D formation in the body. Ultraviolet disadvantages: 1) cause skin aging to produce wrinkles; 2) produce spots; 3) cause dermatitis; 4) cause skin cancer. Sterilization principle of UVC. Among ...
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Wavelength classification and application fields of ultraviolet light
May , 12 2020
According to the different biological effects, UV is divided into four bands according to the wavelength: long-wave UVA, medium-wave UVB, short-wave UVC and vacuum wave UVD. The longer the wavelength, the stronger the penetration. UVA. The wavelength of long-wave UVA, is between 320nm and 400nm, which is also called long-wave black spot effect ultraviolet. It has a strong penetrating pow...
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Replacement of quartz clock movement
Apr , 28 2020
Quartz clock movement is a common movement variety of high-end watches on the market, many famous watches use quartz clock movement, after the quartz clock movement has been used for a period of time, it needs to be replaced, so that the clock can work better, the following is to introduce the replacement of the quartz clock movement, so that you can replace the quartz clock movement yourself. As ...
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Comparison between quartz clock movement and mechanical movement.
Apr , 28 2020
Quartz clock movement and mechanical movement are two ways of movement, both of which are more common forms of watch movement. Here is a comparative introduction of quartz clock movement and mechanical movement, so that you can choose a suitable watch movement. Quartz movement in the movement is more common, to put it bluntly, it is "simple, anti-manufacturing, accurate and cheap". Here, "simple" ...
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Which is better for the quartz clock movement to jump seconds or sweep seconds?
Apr , 28 2020
Quartz clock movement jump seconds and sweep seconds are two forms, quartz clock movement jump seconds or sweep seconds which is better? The following is to introduce you to the quartz clock movement jump seconds and sweep seconds of the two forms, in order to facilitate your purchase. The second-jumping movement means that the second hand of the clock will beat and turn and make a slight "ti...
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What is MDF(Medium Density Fiberboard)？
Apr , 22 2020
The full name of MDF is Medium Density Fiberboard. MDF is made of plant fiber as raw material, applied with urea-formaldehyde resin or other synthetic resin, and pressed under heat, pressure and pressure. Plates with a density in the range of 0.50-0.88g / cm3 can also be added with other suitable additives to improve the characteristics of the plate. MDF has good physical and mechanical properties...
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What should I do if the disinfectant accidentally splashes into my eyes? It is important to learn this trick
Apr , 14 2020
During the epidemic, disinfection has almost become a daily task for every household. 84 disinfectants, 75% medical alcohol and other disinfectants have also become standing supplies in the home. However, improper use of disinfectants also poses safety risks for some families. Recently, Pan Changjiang posted a video online. In the video, Changjiang Chang came to her daughter's house, but she was s...
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Is the temperature getting lower? To see if you have applied makeup？
Apr , 14 2020
Cosmetics can not only change the skin infrared temperature measurement value, the error may also be large. Right now, the new coronavirus is ravaging the world, and non-contact infrared thermometers are widely available at the entrances of various public places. As long as you go out, you will inevitably be measured several times a day. Although today's infrared temperature measurement technology...
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Wuhan Lockdown Lifted
Apr , 08 2020
Wuhan Lockdown Lifted
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