In hot summer, the frequency of use of refrigerators has increased dramatically. But is it safe and hygienic to store food in the refrigerator? In fact, refrigerators do not clean frequently because of long-term storage of food, which can breed many bacteria and cause "refrigerator disease." "Refrigerator disease" refers to people eating foods stored in the refrigerator that cause diarrhea or adverse reactions to gastrointestinal problems.
Do you have a "refrigerator"?
Refrigerator headache
Foods that have just been taken out of the refrigerator freezer, if eaten immediately, will significantly stimulate the oral mucosa and cause head vasospasm reflexively, resulting in a series of symptoms such as dizziness, headache, and nausea.
Refrigerator pneumonia
If the refrigerator is not frequently cleaned at ordinary times, it is very easy for the ventilators and evaporators of the freezer to grow fungi. After allergic constitutions or children inhale this contaminated air, it is prone to cough, chest pain, chills, fever, chest tightness, and asthma. Other symptoms are clinically called "refrigerator pneumonia."
Refrigerator gastritis
A large amount of frozen or frozen foods in the refrigerator is eaten, and the gastrointestinal tract induces episodes of paroxysmal colic and vomiting after being subjected to strong cold stimulation. This is called "refrigerant gastritis."
Refrigerator enteritis
There is a bacterium called Yersinia that is widely found in animals such as pigs, dogs, cats, cows, horses, sheep, rabbits, and pigeons. If the foods stored in the refrigerator are not fully heated, it is very rare. It can easily cause enteritis in the refrigerator and cause abdominal pain, diarrhea and vomiting.
Stay away from "refrigerator disease"
Although there is a threat of a refrigerator, many foods need to be kept fresh in the refrigerator, especially in the summer. How to effectively avoid refrigerator disease while using the refrigerator?
Try to eat fresh foods
Do not store food in the refrigerator for a long time, especially for some vegetables. It is recommended not to exceed 3 days. If food has become corrupt, discard it immediately to avoid contaminating other foods.
Refrigerator regularly cleaned and disinfected
Once a week in summer, at least once a month in other seasons, use 0.5% bleach to scrub, then wipe.
Don't put the fridge full
Leave some void to ensure cold air flow. In addition, try to reduce the number of refrigerators and shorten the opening time.
Fresh cooked food inside the refrigerator
Especially vegetables, it is best kept sealed. This storage for a long time, but also to avoid cross-infection.
Reminder: It is best to use the refrigerator for a long time to measure the temperature, to ensure that the freezer is about 4 °C, the freezer is about minus 18 °C in order to play the best effect of the refrigerator. (Huaron Network Synthesis)
We may have ever heard of the Bullet Fixed Focus Camera/ Fixed Focus Bullet Camera HD/ Bullet Fixed Focus Journal Camera/ Fixed Focus Bullet Camera IR/ Fixed Focus Bullet Surveillance Cameras/ Fixed Focus Analog Bullet Cameras, so what is the Bullet Fixed Focus Camera? We know that the Bullet refers to the camera shape, so what about the Fixed Focus? Actually, the Fixed Focus refers to a type of the camera lens. Today let me introduce the camera lens for you.
The camera lens is the key equipment of the video system. The lens' quality (index) directly affects the overall index of the camera. The lens is equivalent to the lens of the human eye. As you know, if there is no lens, the human eye cannot see anything. That is to say, if there is no lens, then the output image of the camera will just be white without any clear image output; which is consistent with the principle of our home cameras.
Actually, there are many classifications for the camera lens. Today please let me introduce one classification for you---the classification according to the structure.
1. The fixed focus lens with the fixed aperture
The lens has only one focus adjustment ring that can be manually adjusted. Rotating the ring left and right can make the image on the CCD target surface clearest. There is no aperture adjustment ring, so the aperture cannot be adjusted, and the luminous flux entering the lens cannot be changed by changing the lens factors, but can only be adjusted by changing the illuminance of the shooting site. The structure is simple and the price is cheap.
2. The fixed focus lens with the manual iris
Compared with fixed focus lens with the fixed aperture, the fixed focus lens with the manual iris has an extra aperture adjustment ring. The aperture range is generally from F1.2 or F1.4 to fully closed, which can easily adapt to the illuminance of the shooting site, and the aperture adjustment is done manually. The illuminance is uniform and the price is cheap.
3. The fixed focus lens with the automatic iris
Compared with the fixed focus lens with the manual iris, the fixed focus lens with the automatic iris has an extra gear-driven micro motor on the iris adjustment ring, and a 3 or 4-core shielded wire is drawn from the drive circuit, then connected to the camera's automatic iris interface seat. When the luminous flux entering the lens changes, the charge generated by the CCD target surface of the camera changes accordingly, thenthe video signal level changes, and a control signal will be generated and transmitted to the automatic iris lens, so that the motor in the lens can perform the corresponding rotation to complete the task of resizing.
4.The electric zoom lens with the automatic iris
Compared with the fixed focus lens with the automatic iris, the electric zoom lens with the automatic iris two extra micro motors. One motor is connected with the zoom ring of the lens, and can control the focal length of the lens when it rotates; the other motor is connected with the focus ring of the lens, and it can complete the focus of the lens When it rotates with control from the former motor. However, due to the addition of two motors and an increase in the number of lens groups, the size of the lens has also increased accordingly.
All in all, it would be helpful to know about the camera lens if you want to know more about the Bullet Fixed Focus Camera and the whole video monitoring field.
Fixed Focus Bullet Camera HD, Bullet Fixed Focus Journal Camera, Fixed Focus Bullet Camera IR, Fixed Focus Bullet Surveillance Cameras, Fixed Focus Analog Bullet Cameras
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