Improving the wind resistance of arch sheds and preparing for wind protection in advance is the basis for reducing wind damage.
The first is to strengthen the columns, replace the old bamboo poles, and put on the shed film, which is the basis for improving the wind resistance of the arch shed. The tightness of the upper film and the setting of the vents have a great impact on the ability to resist wind. When applying the film, you should choose a sunny day without wind, and you must tighten it before you go on. The shed film cannot be loosened. This way, the shed film has a small range of motion, is not easy to be agitated by the wind, and is not easy to break.
The second is to pay attention to the setting of the ventilation openings when the film is applied. The overlap of the two films is preferably 25 to 30 cm to ensure the tightness of the arch shed. It should not be too wide, so as not to affect the ventilation, especially when the air vents are not open at high temperature in summer, which will affect the cooling of the shed. It should not be too narrow to avoid the air vents not being tightly closed when the wind is strong. Stronger.
The third is to do a good job of wind protection in key parts. According to many years of experience, if there are high objects near the arch shed, such as houses, trees, etc., strong winds will cause cyclones or turbulence due to the blocking of these objects, especially when these objects are in the south direction of the arch shed. After being blocked, it descends, enters the shed through the gap on the south side of the shed, causing inconsistent air pressure in the shed, and may rupture the shed film. It is recommended that vegetable farmers with tall objects near the arch shed increase the number of laminating ropes, and double-layer films are set at the door to tightly block the entrance and exit of the arch shed to prevent airflow from entering.
The fourth is to strengthen inspections during high winds. The strong wind will agitate the shed membrane. If the ventilation openings are not set properly, it is likely to be scraped, causing the air pressure in the shed to change, affecting the structure of the shed. In particular, arch sheds with small angles on the sides and higher sides have greater resistance to wind. If the ventilation openings are not strict, the air flow will easily cause different pressures inside and outside the shed, which will rupture the shed film, which may cause serious damage. Caused the entire arch to collapse. Such arch sheds should pay attention to the transformation, strengthen the bearing capacity of the columns on both sides, increase the number of mulching ropes on the shed surface, close the ventilation openings, and improve the wind resistance of the shed. During high winds, you must pay attention to inspections, observe the conditions of the vents and changes in air pressure in the shed, and adjust in time to avoid the situation of rupturing the shed film or even scraping the shed.
Disclaimer: Some articles on this website are transferred from the Internet. If third party legal rights are involved, please inform this website to deal with them. phone
Diagnostic reagents can be divided into two categories: in vivo diagnostic reagents and in vitro diagnostic reagents. It is mostly a reagent for detection by the reaction between antigen and antibody.
A: Classification of in vitro diagnostic reagents:
1. In vitro biodiagnostic reagents managed as drugs include:
1. Blood type and tissue type reagents;
2. Microbial antigen, antibody and nucleic acid detection reagents;
3. Tumor marker reagents;
4. Immunohistochemistry and human tissue cell reagents;
5. Human genetic testing reagents;
6. Biochips;
7. Allergy diagnostic reagents.
2. In vitro reagents managed as medical devices include:
1. Clinical basic test reagents;
2. Clinical chemistry reagents;
3. Blood gas and electrolyte determination reagents;
4. Vitamin determination reagents;
5. Cell histochemical stains;
6. Autoimmune diagnostic reagents;
7. Microbiological test reagents.
B: According to medical test items, clinical diagnostic reagents can be roughly divided into clinical chemical test reagents, immunology and
Serological testing reagents, hematological and cytogenetic testing reagents, microbiological testing reagents, body fluid excretion
Detection reagents, genetic diagnosis reagents, etc. Among them, the market share of clinical chemistry
The largest, close to 34%; followed by the immunology market, accounting for about 29%. Novel immunodiagnostic reagents and genetic diagnostic tests
The reagent was developed in the late 1980s, and it is the most common diagnostic reagent for all current diagnostic reagents, regardless of technology or market.
The fastest growing product.
Urine Rapid Test Kit,Rapid Test Kit 6-Panel,Toxoplasma rapid test kits,Fecal Occult Blood Test
Jilin Sinoscience Technology Co. LTD , https://www.jilinsinoscience.com