What kind of mask should I take to CDC

1. To volunteer in CDC,
you only need to bring your ID card

of course, they have to audit it
it's OK for ordinary people who have no disease.

2. You should want to know the inertia of the load. There is such a formula, but your data is too little to calculate. According to the moment of inertia theorem, the torsion moment M = J β
where: j-moment of inertia, β— Angular acceleration

when the cylindrical load rotates around its axis, the moment of inertia J = Mr ^ 2 / 2
where m is the mass of the cylinder, R is the radius of the cylinder

according to △ T seconds to △ T seconds ω The angular acceleration of the cylinder can be calculated according to the requirement of rotational / minute angular velocity β= △ ω/ In this way, according to the radius r, length L and material density ρ， Calculate the mass m and the moment of inertia J,
calculate the angular acceleration according to the required starting speed β， Then the torsion moment M can be calculated. Then select the motor according to M. At the same time, the driving power of the motor can be calculated according to the load speed and transmission ratio
at the same time, you should also consider that the torque obtained at this time is the load torque, and the actual torque of the motor after deceleration, and the rated parameters of the motor have this data.

3.

When collecting new coronavirus, you must wear professional N95 mask, protective clothing and isolation gloves

New Coronavirus is highly infectious, mainly through the respiratory tract. The droplets proced by sneezing, coughing and speaking are infected by viruses, which can be directly inhaled by close contacts and cause infection. p>

therefore, when choosing a mask, it is necessary to choose a mask that can block droplets, body fluids, secretions, etc., and can fit well with the face, which can not only prevent the patient from spraying droplets, rece the amount and speed of droplets, but also prevent the droplets from being inhaled by the wearer

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extended data:

prevention methods

how to prevent coronavirus infection? Beijing CDC suggests that we should strengthen personal protection, avoid contacting wild livestock, and put an end to sick work and party

in case of fever, cough and other respiratory infection symptoms after traveling from Wuhan and other places, we should choose the fever clinic of the nearest hospital according to the condition, wear a mask, and inform the doctor of the contact history and travel history of similar patients or animals. Specific suggestions are as follows:

1. Avoid going to crowded public places. Avoid contact with patients with fever and respiratory tract infection. Wear a mask if necessary

Wash hands frequently. Especially when hands are polluted by respiratory secretions, after touching public facilities, after taking care of patients with fever, respiratory infection or vomiting and diarrhea, after visiting hospitals, after handling contaminated articles, and after contacting animals, animal feed or animal feces

Do not spit everywhere. When sneezing or coughing, cover your mouth and nose with a tissue or elbow

Strengthening exercise, regular work and rest, keeping indoor air circulation

4. 01 fabric Mask & 160
people usually use it more. It can't rece the risk of respiratory infection in public places for normal people. It is generally recommended for sick people to wear it, which can rece the probability of spreading virus to the surrounding environment in public places

02 medical mask & 160
it is a kind of soft foldable mask, which can filter pathogens to a certain extent, but its water resistance and particle filtration efficiency are low. When it comes to close contact with patients, especially patients with cough, expectoration, sneezing and other symptoms, its protection efficiency is greatly reced<

03 medical surgical mask
this mask is also a soft foldable mask with three-layer three-dimensional mesh design, which has relatively high protection efficiency. Ordinary citizens can use it for daily protection of most respiratory infectious diseases. It is worth noting that, because of the similar shape of medical masks, it is usually difficult for ordinary citizens to judge the difference between medical surgical masks and medical masks intuitively according to their appearance. Here is a little tip. Medical surgical masks are proced according to the pharmaceutical instry standard (yy0469-2011 medical surgical masks), which will be mentioned in the instructions, Public friends can also ask the drugstore for details<

04 anti haze mask
in addition to the above masks, there are anti haze masks and disposable medical protective masks for haze on the market. If you are not in close contact with patients with infectious diseases or suspected patients with infectious diseases, it is not recommended to wear protective masks for a long time

let's see the doctor of Medical Department of Shanghai Oriental Hospital demonstrate the standard steps of wearing masks

Step 1
wash your hands first, then wear a mask. Pull the mask flat and unfold slightly. The newly bought mask has folding mark for convenient packaging. Be careful not to touch the mask

Step 2
flatten the mask with both hands, align it with the face, and pay attention to the best position of 1cm from the upper edge of the mask to the eyes. It should be noted that there are positive and negative sides of the mask. When wearing the mask, you should distinguish which side is facing in and which side is facing out. Generally, the light color face has moisture absorption function, which should be close to the mouth and nose, and the dark color face is facing out

Step 3
gently press the mask on the bridge of nose with your left hand. At this time, make sure that the bridge of nose is in the center of the mask. Use your right hand to hang the mask strap to the root behind your ears. Pay attention to hang it at the root of your ears, otherwise it will fall off easily

Step 4
fix the edge of the mask with both hands to make it close to the face. Many masks have a small metal strip that can be bent and fixed. This is the nose clip. When wearing the mask, let the nose clip bend and fit on the bridge of the nose, so as to ensure the airtight of the mask

Step 5
make sure the mask completely covers the nose and mouth. Adjust the position of the mask. The correct coverage is 1cm below the chin and eyes. When taking off the mask, try not to touch the outside of the mask. Remember to wash your hands immediately after taking off the mask. Do not reuse disposable medical masks. Once the mask is broken or dirty, it needs to be replaced immediately.

5. The key depends on whether the inhalable harmful substances in the laboratory are gases or particles
harmful gases must be protected by gas masks. Generally, it is made of activated carbon
st masks are generally used to protect particles
some environments have both st and harmful gas, so comprehensive gas masks are used
for your health, it is recommended to do a good job in respiratory protection. Scientific selection of st mask, choose a good mask with good protection effect, smooth breathing and economical use. It helps to prevent lung injury< The way to clean up the st: now the mask must comply with the gb2626-2006 standard. Dust masks are classified into kn100, kn95 and Kn90. Kn100 can achieve nearly 100% (99.97%) protection effect on ultra fine st. Gas masks must comply with gb2890-2009 standard
the protective effect of st mask depends on two aspects. One is the filtration efficiency of the filter element. The second is the tightness of mask and face
therefore, the mask must be divided into different sizes, and the fitting effect between the mask and the face varies from person to person
the way to clean up the st: the scientific selection of protective masks certified by national standards can help to prevent the occurrence of toxic and harmful gases and st
1. Because of the high air leakage rate of disposable masks, there is no gas mask
2. Choose kn100 st-proof filter cotton or corresponding filter box. Low protection rate will lead to physical injury
3. It is more comfortable to choose silicone material. It is suitable for long-time wearing and is not easy to cause allergic reaction. The mask with high hardness is easy to cause facial indentation
4. Masks are divided into different sizes, which is extremely important. Don't buy the so-called universal models. Easy to leak
5. There are two kinds of masks covering the nose and mouth, covering the nose and mouth and mandible. It is recommended to use the latter, which is relatively comfortable
6. It is recommended to choose a smooth breathing mask. Some use double filter design, such a mask relatively smooth breathing.

6. Wear kn100 st mask as far as possible. The double half mask type is required. According to the national standard, the air leakage rate of half mask should not be less than 2%, and the air leakage rate of high-quality half mask should be about 2%. The effect is better
asbestos inhalation is prone to lung tumor
nowadays, many high st enterprises generally choose to use high-grade protective masks. It can effectively prevent pneumoconiosis. Pneumoconiosis is known as an occupational disease without the right to lie down and die, and it can not be cured by medical treatment. Therefore, paying attention to respiratory protection is the first, but do not panic. Pneumoconiosis can be prevented but not cured

scientific selection of st masks certified by gb2626-2006 standard is helpful to prevent lung injury
1. Disposable masks are not suitable for long-term protection e to high air leakage rate
2. Choose kn100 st-proof filter cotton. Low protection rate will lead to physical injury
3. It is more comfortable to choose silicone material. It is suitable for long-time wearing and is not easy to cause allergic reaction. The mask with high hardness is easy to cause facial indentation
4. Masks are divided into different sizes, which is extremely important. Don't buy the so-called universal masks. Easy to leak
5. There are two kinds of masks covering the nose and mouth, covering the nose and mouth and mandible. It is recommended to use the latter, which is relatively comfortable
6. It is recommended to choose a smooth breathing mask. Some masks are designed with double filter cotton, and the filter cotton has two sides, so the mask can breathe smoothly. At present, the kn100 respirator in our country is used in the high st environment, and the average cost is about 1 yuan. Both enterprises and indivials can afford it.