Category: Medical and Health
Analysis:
Radiation and electromagnetic wave interference
Traditional displays use electron guns to emit electron beams. Radiation sources will be generated on the screen. Although existing products have greatly improved in technology and have continuously reduced radiation damage, it is still incurable.
At this point, TFT liquid crystal displays (which are the most commonly used type of liquid crystal displays today) have an inherent advantage, and their radiation amount is almost negligible (liquid crystals originally have no radiation, and the radiation of liquid crystal displays From the high-voltage package and individual circuits inside the LCD monitor). As for the interference of electromagnetic waves, TFT LCD displays only have a small amount of electromagnetic waves from the drive circuit. As long as the casing is tightly sealed, the leakage of electromagnetic waves can be eliminated.
In order to better dissipate heat, traditional monitors have heat dissipation holes drilled into the casing. Although the heat dissipation effect is achieved, it is inevitably subject to electromagnetic wave interference.
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As long as it is an electronic product, it is inevitable that there will be radiation. It is just a matter of size~
It is not only found in electronic products, but also in most everything around us. Of course, there is no need to take radiation seriously. Each of us is exposed to radiation every moment. Certain materials inside the earth continuously emit rays, so the human body has a certain ability to withstand radiation. Don't pay too much attention to these things, otherwise your life will be very tiring.
The basic component of a computer monitor is a cathode ray tube. When the electron stream emitted by the cathode ray tube hits the fluorescent screen, it can produce rays that are harmful to the human body. However, the shell of the computer monitor can absorb a large amount of rays. The radiation exposure to the human body is actually measured at 6 millirads, which is far from the maximum radiation dose of 5 millirads allowed by the human body. Therefore, the rays emitted by computers will not have any adverse effects on the human body.
The radiation that exists around the computer includes
X-rays,
ultraviolet rays,
visible light,
infrared rays ,
Ultra-high frequency,
High frequency,
Extremely low frequency,
Electrostatic field.
But the intensity of their emission is very weak. Far below the standards required by our country and international health organizations.
Relevant people from the Irradiation Center of China Institute of Atomic Energy believe that computer radiation is a kind of weak radiation and will basically have no impact.
The keyboard and mouse also emit radiation, and it is larger than the monitor!!!
Indeed, there is a reference value for the radiation amount of each related component of the computer:
Keyboard 1000V/m,
mouse 450V/m,
screen 218V/m,
host 170V/m.
Placing a cactus in front of your computer desk is said to help reduce radiation.
The position of the computer is very important:
Try not to let the back of the screen face people, because the computer radiates the strongest radiation from the back, followed by the left and right sides, and the screen The front side has the weakest radiation. As long as the words can be read clearly, the distance should be at least 50 cm to 75 cm. This can reduce the damage of electromagnetic radiation.
Pay attention to indoor ventilation:
Scientific research has confirmed that computer screens can produce a carcinogen called brominated dibenzofurans. Therefore, it is best to install a ventilation fan in the room where the computer is placed. If not, pay special attention to ventilation when surfing the Internet.
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Experts say that the radiation frequency of an induction cooker is only one-sixtieth that of a mobile phone. Therefore, electromagnetic waves are not " "Invisible killer", if used properly, it will also have a good effect on people's health.
Most of the "magnetism" generated by the induction cooker is distributed at the bottom of the pot, forming a closed magnetic field.
When the pot is placed on the induction cooker to "work", the closed magnetic field intensity generated by the induction cooker has a maximum strength of 160 milligauss at the edge of the induction cooker, while the signal magnetic field generated when using a mobile phone is close to 1600 milligauss. , which is 10 times the magnetic field at the edge of the induction cooker surface. It can be seen that the magnetic field generated by the induction cooker has far less impact on the human body than that of a mobile phone.
When the pot is vertically 3-5cm away from the induction cooker panel, the pot will not regenerate heat beyond the closed magnetic field range, and the induction cooker will automatically stop working; the horizontal magnetic field outside the closed magnetic field range is very weak, about It accounts for a few tenths of a percent of the entire magnetic field energy, and is even basically close to the earth's magnetic field.
When the minimum diameter of the pot is less than 8cm, the induction cooker will not work. Therefore, there is no need to worry about the impact of the "magnetism" of the induction cooker on the human body.
First thing: Choose a well-known brand. All electrical appliances in life produce radiation, and induction cookers are no exception. Although the induction cooker itself radiates less radiation, choosing a high-quality induction cooker will better protect your safety.
Second requirement: appropriate power. To avoid unnecessary waste, choose an induction cooktop that suits your household needs. For an ordinary family of three, an 800-watt induction cooker can meet the requirements. If there are more people, you can choose a high-power induction cooker of 1000W-2000W.
Third essentials: The appearance of the furnace surface is smooth and undamaged. When purchasing, pay attention to the flatness of the stove surface. If the furnace surface is convex, concave or tilted on one side, it will affect the normal production of thermal efficiency.
Four things: Check with your own hands. When purchasing, you can turn the induction cooker over and shake it to see if there is any gap or looseness between the fan blades and the shaft, and between the shaft and the bearings. After powering on, the motor should make no obvious noise or friction, and the fan blades should rotate smoothly and without swinging. rotation and other phenomena.
Induction cookers are favored by consumers due to their safety, hygiene, energy saving, fireless cooking, and ease of use. However, many brands of induction cookers make it difficult for customers to choose. Induction cookers are high-power electrical appliances that are closely related to everyone's life. When purchasing, we should consider professional quality, safety, price, and after-sales service. We must go to regular shopping malls to buy. The author has some experience in purchasing induction cookers and now provides them for your reference.
Regular manufacturers pay special attention to product quality and safety issues. The author reminds everyone that the texture of the induction cooker top plate is very important. Whether the magnetic field lines penetrate the induction cooker top plate sufficiently is directly reflected in the heating effect of the induction cooker on pots. Authoritative figures in the induction cooker industry have unanimously determined that "ceramic" is the best material suitable for the top plate of induction cookers. The induction cooker top plate made of ceramic has good heat conduction effect and full penetration of magnetic lines, saving energy and money. The control panel of the induction cooker is best to have a flat design and use insulating and waterproof materials. The control panel of the induction cooker with a non-planar design uses metal buttons, which can easily cause water to enter the body and affect the service life of the induction cooker. In severe cases, the user may get an electric shock and endanger his or her life. Safety. Therefore, when we buy an induction cooker, we must pay attention to whether the top plate of the induction cooker is made of ceramic and whether the control panel is made of PTC insulating and waterproof material. In addition, it is also important to see whether the control panel is flat in design.
According to the author's observation, there are two types of induction cooker tops on the market:
One is a ceramic top, available in white and colorful. The induction cooker industry divides ceramic top plates into three levels based on the actual working index of the top plate. Grade A is Japan's NEG space ceramic top plate. It is a micron-level crystal. It is fired at a high temperature of 1500°C for 45 days and formed in one step. It can withstand high temperatures of 1100°C, withstand a temperature difference between hot and cold of 800°C, and has strong impact resistance.
Because of its compact texture, easy cleaning, non-discoloration, full penetration of magnetic lines, and high thermal efficiency, the NEG space ceramic top plate is recognized by the induction cooker industry as an "ambassador" for energy saving and cleanliness. Grade B is a domestic special-grade white ceramic top plate. The firing cycle is about 7 days. It is fired at a temperature of 500℃~600℃, and then cooled and cut at a temperature of 200℃. It is not molded in one go. Although it is also white, it is prone to yellowing and discoloration. It has poor magnetic field line penetration, low thermal efficiency, and poor temperature resistance. In severe cases, the roof may explode, thus endangering the personal safety of consumers. Class C is a domestically produced ceramic roof with a simpler manufacturing process. Once used, it will turn yellow and discolor in a short period of time, which is worse than Class B roofs.
The author has some experience in identifying the ceramic top plates of Class A, Class B or Class C induction cookers. C-grade boards can be identified at a glance. Induction cooker top plates with flowers, grass, insects, and fish printed on them are mostly C-grade boards. Because they turn yellow and change color quickly, manufacturers print patterns to cover up defects. Although B-grade boards and A-grade boards are both white, it is not difficult to tell them apart. Class B boards are not fired in one step and need to be cut, so the edges are rough. Careful observation and experience with your hands will immediately reveal the truth. Class A boards are fired in one step at ultra-high temperature, with smooth edges and no cutting marks. In addition, comparing the two top plates together, the B-grade plate is much inferior to the A-grade plate in terms of smoothness and crystal transparency. The back of the B-grade plate is dark yellow, while the front and back of the A-grade plate are the same color. Induction cookers are kitchen stoves that deal with oil fumes every day. The A-grade ceramic top is white. Even if there is dirt on it, it can be as clean as new after proper cleaning. If the merchants of induction cookers with B-grade and C-grade ceramic tops promise in writing that they will not discolor after long-term use. , it can be clean as new, does not reduce thermal efficiency, and does not endanger personal safety, which is acceptable.
The other is a glass-ceramic top plate, which is black. The glass-ceramic top plate is the same as the B-grade domestic special-grade ceramic top plate. It is difficult to compare with the A-grade NEG space ceramic top plate in terms of high temperature resistance, resistance to cold and hot temperature differences, impact resistance, heat conduction effect, and magnetic field line penetration. Because it is black, it will not turn yellow or change color. In the past, the induction cooker market has always been dominated by white ceramic top plates. In the past two years, the emergence of black ceramic top induction cookers has given consumers a refreshing feeling and followed the trend in producing this type of cookers. There are many manufacturers of roof panels, and the quality varies. The top plate is made of crystallized glass, which has extremely high crystal transparency. Currently, the only manufacturer recognized in the industry as being able to produce crystallized glass top plates with relatively stable quality is "Fute".
According to surveys, the international application of electromagnetic technology to the production of civilian induction cookers was in the mid-1980s, and the domestic production and sales of induction cookers began in the early 1990s. Some induction cooker manufacturers promote themselves Induction cookers have been produced and put on the market since the 1970s. This kind of false and misleading propaganda infringes on the legitimate rights and interests of consumers.
The author believes that when we purchase induction cookers, in addition to understanding product quality, after-sales service is also very important. Professional induction cooker brands should set up independent customer service centers in the local area, and their after-sales commitments should be in writing. of.
I hope that the above discussion can help you, so that you can buy an induction cooker that is safe, saves money, and has good after-sales service, and feel the happiness that modern technology brings to our lives.
1. If you are exposed to "super-intensity" electromagnetic radiation for a long time, the following symptoms may occur: accelerated skin aging. The incidence of various malignant tumors increases. The miscarriage rate and the incidence of fetal abnormalities among pregnant women are increasing. Reduced resistance and retarded growth and development. Produces neurasthenic symptoms such as headache, insomnia, arrhythmia, etc.
2. The microwave oven should be at least 1 meter away after it is turned on. (Don’t go near it if you are pregnant)! The national inspection standard is measured at a distance of 5 centimeters.
Leaks are inevitable. But air leakage is not normal.
3. The high-voltage capacitor on the inner wall has been charged, and there is still electricity inside after the power is cut off.
4. The following maintenance is excerpted from: cctv/health/special/C12291/************/101689.s
The main content of maintenance is cleaning work . Please pay attention to the following points when cleaning:
(1) Before cleaning, please unplug the power plug from the power socket.
(2) After daily use, immediately wipe off the dirt on the oven door, oven cavity and glass plate with a wet cloth. It is easiest to wipe clean at this time. If there is no need for immediate cleaning on a daily basis, it is best to use a container to heat some water into steam after repeated use to soften the dirt in the furnace, and then wipe it with a wet cloth to make it easier to clean. If the dirt is serious, it is also allowed to scrub with neutral detergent or soapy water (rinsing is not allowed). However, it is prohibited to use banana water, gasoline, soap, hard cloth or brush to scrub. This will damage the paint layer and cause rust in the furnace cavity.
(3) If the microwave oven has a peculiar smell after being used for a long time, you can add lemon or vinegar to water and heat it in the furnace to boil, and the peculiar smell will be eliminated.
(4) Regardless of whether the microwave oven is used or cleaned and scrubbed, there will be water vapor or moisture in the oven cavity. Therefore, wiping it with a dry cloth or opening some oven doors slightly to ventilate and dry it will greatly reduce the failure rate of the microwave oven and prolong the service life of the microwave oven