[China Aluminum Network] The quality of aluminum alloy doors and windows can be roughly judged from the selection of raw materials (aluminum profiles), aluminum surface treatment and internal processing quality, and the price of aluminum alloy doors and windows.
The cover glass is covered on the material on the glass slide, which can avoid the contact between the liquid and the objective lens, so as not to contaminate the lens, and can make the top of the observed cells in the same plane, that is, the distance from the objective lens is the same, so that the observed Images are clearer.Why do you need a coverslip when using a microscope
The purpose of staining the specimen with iodine solution is to make the cells more obvious under the microscope, and it can also kill the cells and prevent the cells from migrating.
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A look at the use of materials, aluminum profiles used in high-quality aluminum alloy doors and windows, thickness, strength and oxide film, shall comply with relevant national standards, wall thickness should be more than 1.2 mm, tensile strength of 157 newtons per square meter, The yield strength must be 108 Newtons per square millimeter and the thickness of the oxide film should reach 10 microns. If it fails to meet the above criteria, inferior aluminum alloy doors and windows cannot be used.
Second, look at processing, high-quality aluminum alloy doors and windows, fine processing, installation stress, good sealing performance, switch freely. Inferior quality aluminum alloy doors and windows, blind selection of aluminum profiles and specifications, rough processing, and saw cutting instead of milling, not installed as required, poor sealing performance, switches are not comfortable, not only leakage of air leakage and glass burst phenomenon, but also To strong winds and external forces, it is easy to scrape or fall off the push-pull part or glass, destroying things and hurting people.
Third, look at the price, in general, high quality aluminum alloy doors and windows due to high production costs, the price is about 30% higher than inferior aluminum alloy doors and windows. Some aluminum alloy doors and windows made of aluminum profiles with a wall thickness of only 0.6-0.8 mm have much lower tensile strength and yield strength than the relevant national standards and are not safe to use.
In addition, there are many self-employed aluminum alloy doors and windows, and they do not understand the structural characteristics and performance of aluminum alloy doors and windows. In order to reduce the cost of cutting corners, shoddy products, the hidden dangers of the product is generally not suitable. It is better to use the products of regular aluminum alloy door and window manufacturers. Here is a special point to point out: Now the national standard profile thickness is 1.4mm, if the supplier chooses a 1.2mm or 1.0mm wall thickness or even thinner material, it belongs to non-compliance products, please buy Pay attention to it.
2. Make the specimen relatively fixed;
3. It is convenient to use the capillary phenomenon to form a gradient when adding various reagents (staining agent, acid, salt solution);
4. Avoid contamination of the specimen.
Aluminum alloy doors and windows to pay attention to three points