As the weather turned cold, the amount of vegetables in the arched shed gradually decreased in the later stage of the results. It is particularly important to improve the thermal insulation of the arch shed and extend the time to market for vegetables.
However, the setting of multi-membrane vegetables for autumn stubble sheds is different from that of spring stubble, because most of the autumn stubble vegetables have reached the late stage of growth, the plants are tall, and the restrictions on vegetables are greater when setting the film.
Grasp the film setting time and the number of covering layers Generally speaking, when the minimum external temperature drops to 8 ° C, two films should be set to enhance heat preservation.
If the temperature drops too fast, we should take advantage of the convenient conditions and add three membranes on the hanging wire.
When the minimum temperature in the shed drops to 10 ° C, a layer of film can be placed on the hanging steel wire to improve the thermal insulation.
As the temperature continues to drop and vegetable growth stagnates, vegetable farmers can untie all the hanging ropes, bring the plants close together, and then directly cover the plants with a film to ensure that the existing vegetables on the plants are not damaged by freezing. Extend the storage time and sell more. Good price.
The second film and the third film not only require better light transmission, but also have better anti-fog and dripping properties, so as to avoid the opposite effect caused by dripping water and fog. For example, the second film can be 20-30 cm away from the lower end of the shed film. Use poles to set up bamboo poles and wire according to the arc of the shed. Then set the film on the bamboo pole and wire. The bottom ends of the two sides should be covered with soil. Left and right, tightly sealed with iron clips. The third film is below the second film, and its installation measures can be the same as the second film, but it should be noted that the distance from the second film can be appropriately increased.
For arched sheds such as Artemisia annua, the setting of two films and three films can be the same as that of spring stubble vegetables. The four-membrane small arch shed can be seen from the width of the rafters, and the appropriate arch is selected to support the small arch shed.
Multi-film covering, pay attention to heat preservation and dehumidification insulation: fire insulation and wind screens around the arch shed.
The method of raising fire in the shed is simple. You can bundle the waste bamboo rods with a length of 3-5 meters into a bundle, and place a bundle at an interval of 5-10 meters. You can ignite from one end of the bamboo rod at about 2 am, or directly use sawdust briquettes, and the burning time is about 1- In 2 hours, the temperature in the shed can be increased by 3-5 ° C to prevent the vegetables from being frozen.
Although the fire in the shed can increase the temperature in the shed, it is close to the area around the arch shed because the heat is quickly dissipated, and the vegetables are still prone to freezing at night when the temperature is relatively low. Therefore, vegetable farmers should also pay attention to strengthening the insulation around the arch shed, and a layer of wind film or straw curtain can be set around the arch shed to improve the insulation of the arch shed.
Dehumidification: When the temperature in the shed reaches 25 ° C when the weather is fine in the daytime, the second membrane in the shed should be opened in time for ventilation, but the width of the ventilation opening should not exceed 15 cm; when the temperature in the shed reaches 28 ° C, Vegetable farmers can open the ventilation openings on the top of the arch shed to ventilate the moisture in the shed. Generally, the air vent can be closed from 11 am to 2 pm.
On cloudy days and other bad weather, the vegetable farmer can only open the ventilation openings of the second film at noon to exhaust the moisture in the shed to the space between the second film and the film, and reduce the humidity of the air under the second film.
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Maxillofacial fixation system -- micro-plate for cranial and maxillofacial fracture fixation, designed for the surgical treatment of maxillofacial trauma fractures, suitable for the forehead, nose, orbit, zygomatic, maxillary region, and pediatric craniofacial bones.
The system is an orthopedic surgical instrument for neurosurgical tools. The maxillofacial fixation system includes micro-plates, straight plates, L-shaped plates, T-shaped plates, Y-shaped plates, double Y-shaped plates, H-shaped plates for cranial and maxillofacial fractures. The product range is complete, covering three-dimensional titanium mesh, self-drilling rotary bone screws, anatomical orbital floor plates, orthodontic nails, etc. However, the facial anatomical structure is special, and the screw plate needs to be placed away from the fracture line and avoid important anatomical structures such as nerves and teeth roots. Therefore, the specifications of the screw plate system are required to be as diverse as possible in order to be used in different bone structures, such as different radian, length, and number of screw holes. The bone plates forcranial and maxillofacial fractures are mainly divided into 1.5mm, 2.0mm and 2.4mm systems.
Titanium (including pure titanium and titanium alloy) is the most common material for hard tissue implants. Its elastic modulus and tensile strength are higher than those of human bone, and it is better than other metal materials such as nickel-titanium alloy and cobalt-chromium alloy in terms of biocompatibility and corrosion resistance. Our maxillofacial plate is made of titanium, and the self-tapping screws are mainly made of titanium alloy.
Jaw fractures include maxillary fractures and mandibular fractures. According to whether the fracture trauma is exposed, it can be divided into open fracture and closed fracture. Trauma is the most common cause of jaw fracture, which usually includes hit, traffic injury, fall injury, firearm injury, and a few iatrogenic injuries. All are caused by external forces acting directly or indirectly on the maxillofacial region. With the popularization of motor vehicles, the proportion of jaw fractures caused by traffic accidents has increased year by year, which has become the main cause of jaw fractures. In addition, neoplastic lesions in the maxillofacial region often lead to pathological jaw fractures.
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