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There are many types of freeze dryers, and the market is still full of beautiful things, which is easy to be confused. How do we choose the most suitable one among so many products?
1. Manufacturer's choice
Choose a air dryer refrigerant manufacturer with relatively strong strength, and has many years of experience and technology in the production of freeze dryers, and supports non-standard customization and solutions.
2. Cold trap temperature
A cold trap is a device placed between the freeze-drying chamber and the vacuum pump to trap vapor. The lower the temperature of the cold trap, the stronger the capture ability of the cold trap, but the lower the temperature of the cold trap, the higher the refrigeration requirement, and the higher the machine cost and operating cost. In the absence of special circumstances, the temperature of the cold trap can be selected at -50°C.
3. Amount of condensation
The amount of vapor that can be captured by the cold trap is related to the total amount of sublimation of water or other solvents in the laboratory's daily experimental operation samples.
4. Limit vacuum degree
The limited vacuum degree reflects the leakage of the freeze dryer and the pumping efficiency of the vacuum pump. The vacuum degree of the experimental operation should be within a reasonable range. If the vacuum degree is too high, it is not conducive to heat transfer, and the drying speed will decrease instead.
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As daily protection, there is no need to blindly pursue high-level protection capabilities, just moderate. The choice of masks is not the more expensive the better, nor the cheaper the better, but a reasonable choice according to your own actual situation. Buying kn95 disposable face mask to avoid "entering the pit" can be divided into three steps
The first step is to choose regular purchase channels such as chain supermarkets, pharmacies, and online flagship stores. When purchasing, carefully check the factory name, factory address, contact number, production date, and expiration date on the packaging. "General mask products will be marked with product information on their smallest sales units. If the information is missing, we must be vigilant."
The second step is to identify the implementation standards. "There are many standards for masks, and you don't need to be familiar with them all. Just remember that GB is a national standard and YY is a medical and health standard. The standard that starts with these two codes is usually correct.
The third step, after getting the mask, check whether the product packaging is in good condition, and whether the product surface is damaged or deformed. If the product has a tightness inspection method, you can check it yourself according to the method. "It should also be reminded that hair will affect the fit of the mask to the face. For better protection, it is not recommended to grow beards when wearing high-level protective masks such as KN95."
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The choice of lamps and lanterns in urban lighting design is as important as the choice of lighting source, or even more important. best light city ，As the secondary light distribution of lighting sources, lamps can solve more problems that cannot be solved by lighting sources. The choice of lamps should be coordinated with the use environment. According to different use environments, the appropriate lamp shape and the required protective lamps should be strictly selected.
The arrangement of lamps and lanterns in urban lighting design is particularly important, it directly affects the functionality and artistry, affects the organic combination of humanities and nature, and affects the illumination and effect. In the design, it is necessary to arrange lamps and lanterns according to different places and different functional areas, and even in special cases, for a special effect, it is necessary to customize the lamps and lanterns.
According to the designer's planning and zoning of the overall lighting design, detailed or approximate illuminance calculations and zoning are performed to meet comprehensive indicators such as color rendering, illuminance distribution, glare control, and functional zoning. The lamps and lanterns should be based on different lamps and different places Arrange and arrange reasonably, and finally meet the requirements.
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The main components of electronic cigarettes:
1. Propylene glycol. More than 90% of the ingredients in e-liquid are propylene glycol. It is often used as a solvent or moisturizer in care products, pharmaceuticals and cosmetics. flat disposable vaporizer .When used in small amounts, it has no obvious negative effects on the human body. Relevant agencies also have clear restrictions on their use.
2. Glycerin, glycerin is a non-toxic and tasteless liquid, which is the main aerosol in electronic cigarette liquids.
3. Flavor and flavoring agents are common roles in daily life. Excessive consumption is harmful to the human body, and inferior raw materials are even more harmful to the human body. The different smoke flavors in e-liquid are produced by these substances.
4. Nicotine, marked as nicotine in the description of e-liquid, is actually nicotine. Nicotine is one of the main factors that cause many people to become addicted to cigarettes and is harmful to the human body. The nicotine component in e-cigarettes is relatively small, but it still cannot be ignored.
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First of all, it is very important to choose the right sweater for women clothing factory! This also has to do with the group you are selling to. Then choose the first point of the manufacturer, look at the location of the manufacturer! Then someone will ask, what does this have to do with the address?
First, the address where the manufacturer is located, for example, in a developed and prosperous place, the workmanship is better, but the labor is very high, so the price will be relatively high. However, the advantages of being in an industrial cluster will also be relatively large. The factories in these places can help you solve all process problems. This type is more suitable for high-end goods.
Second, in some relatively backward cities, manufacturers usually focus on small workshops, where labor is relatively low, so the relative workmanship is relatively cheap in all aspects. But the disadvantage is that there are more limitations in the process. It is suitable for some simple style customers who only look at the price.
Third, for the boutique category, it is best to find professional boutique studios in first-tier cities, because for boutiques, many places need to communicate, and studios that are in line with international standards can provide more fashion suggestions. Of course, this type of clothing is relatively more expensive.
Finally, understand the basic information of the manufacturers, such as the MOQ, the process, whether the support supports the board, the time of the board, the delivery time and so on. These all feel suitable for both parties, and finally we can start talking about the styles that need to be done.
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With the prosperity of the urban night economy, urban night scene lighting projects emerge one after another, and there are more and more companies undertaking lighting projects in the market, and the strength of the companies is also uneven. How to choose a wholesale lighting supplier ?
Some large lighting companies. There are relatively few such lighting companies in the market today. Their company already has a complete set of processes from internal management to external business docking. The company has its own design and construction team and experimental research and development team. And in the long-term development process, we have accumulated a lot of lighting engineering experience and cases. The company has a very high reputation and stable customer support. Basically, they both do well in lighting projects.
The second category is small lighting enterprises. The strength of such lighting companies is average. Usually, the boss of a company is a salesperson. Once received some large-scale lighting projects, often the strength is not allowed, it will be transferred to other companies. It is no problem for such companies to do some general lighting projects, but such companies generally do not have after-sales service. If anything goes wrong, you have to find someone to repair it yourself.
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Exercise can bring health to people, but some sports enthusiasts don't care about clothing, and often find that their feet are injured and blistered after exercise. Then in addition to the reasons for the shoes, the socks may also be inappropriate. How to choose the right sports socks,socks manufacturer.?
1, to choose pure cotton texture. The pure cotton material is soft, absorbs sweat and feels comfortable to wear.
2. The elasticity of the socks is better.
Elastic socks fit snugly and won't slip easily. Inferior socks will be deformed after washing, and the fibers will agglomerate, resulting in unevenness in various parts, and people will feel grinding feet during exercise. When buying socks, look at whether the elastic fibers of the socks are broken. If so, you must not buy them.
3. Decide whether to choose thin or thick according to the specific situation.
Generally speaking, people with sweaty feet should choose thicker ones; otherwise, choose thinner ones. For some sports, such as badminton, the socks are too thick to affect the foot feel, so buy thinner socks.
4. You need to wear special socks to participate in certain projects.
For some highly confrontational sports, such as football, socks have a high waist, the purpose is to protect the calf, and it must not be ignored in sports.
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Avoid these common maintenance mistakes and extend the life of your RC car: rc charger
Excessive use of lubricants
Excessive use of lubricants attracts dust and grime with a host of negative effects. Solution: Use only the amount needed to keep the part running smoothly
Over-tightening of nuts and screws
Overtightening screws can damage the frame or interfere with proper operation. For example, if you overtighten the nuts on the wheels, the car will be difficult to drive. Solution: When you know when to stop the retaining nut, it's best to mechanically tighten it until you feel more resistance.
Use damaged parts
Chipped, bent or damaged parts can affect your vehicle's performance in ways you haven't noticed yet. If you notice signs of damage, such as uneven wear, cracks, or bending, replace the part.
Battery overcharged and overdischarged
Overcharging and overdischarging will make the RC remote control car battery bulge, resulting in reduced discharge performance and shortened service life. Solution: When the voltage of the monolithic cell reaches 3.2-3.5V, it should be stopped. When fully charged, unplug the battery from the charger in time.
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It is right to choose the visual inspection system equipment that is suitable for you. There are many distributors who earn price differences. The reality may be the same, but the outer packaging is different, and the price is naturally different. So how do you find the right vision inspection equipment for you?
1. First of all, people from the production technology department of the quality department within the company hold a meeting to study and establish the testing requirements. It is not possible to purchase and find that it is not suitable;
2. Find the manufacturer of the visual inspection system, post the sample inspection, comprehensively evaluate the compatibility between the two parties, and schedule the manufacturer to debug on the spot.
3. Inspect whether the visual supplier has relevant strength, whether it is independent research and development, whether it is an agent, whether it is a service reputation, etc.;
4. What is the compatibility and scalability of vision software and equipment, because with the development and adjustment of the company's business, the current inspection items may need to be improved in the future, and the software must be universal, so that other products can be inspected later
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Creative sculpture mainly includes the following contents:
Lighting: For creative sculpture, it is not required that each part is illuminated evenly, but to the front, side and back, respectively, with different brightness of the main light and auxiliary light, so as to show the three-dimensional effect of the sculpture.sculpture buy online For example, if there are high-rise buildings nearby, it is better to use the side top light as the main light.
Materials: Many sculptors will pay attention to the meaning of "objects" in sculpture. In traditional sculpture, the choice of materials is mostly determined by the theme and form. Stone, stainless steel, and copper are the main materials for outdoor sculptures, while glass fiber reinforced plastics or white marble are mostly used indoors. The materials used for relief sculpture are mostly stone and copper. Different materials have different expressive power for sculpture.
Topic selection: The theme selection of creative sculpture design is affected by many factors. The selection of the theme should be based on factors such as setting, environmental characteristics, history and people's aesthetics. There are many sculptures, which can be reflected in the concise functions and novel shapes.
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