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Method for identifying the effective period of pesticides
1. Intuitive Method: For powdered pesticides, start by examining the appearance of the product. If the powder has clumped due to moisture, the taste is weak or has an unusual odor, and it can be easily pressed into a lump, this suggests that the pesticide may have lost its effectiveness. For emulsifiable concentrates, first invert the bottle. If the liquid appears cloudy, separates into layers (oil and water), forms sediment, or shows flocculation, it likely indicates that the pesticide has degraded.
2. Heating Method: This method works best for powdered pesticides. Take 5-10 grams of the pesticide and heat it on a metal plate. If it produces a large amount of white smoke and emits a strong pungent odor, it is still effective. However, if there is little or no smoke and the smell is weak or unpleasant, the pesticide may have failed.
3. Floating Method: Ideal for wettable powders. Take 200 grams of water in a container, then add 1 gram of pesticide and gently spread it evenly on the surface. Observe carefully. If the pesticide dissolves and disperses within one minute, it is still potent. If it doesn't dissolve quickly, it may have lost its effectiveness.
4. Suspension Method: Suitable for wettable powder pesticides. Take 30-50 grams of the pesticide and place it in a glass container. Add a small amount of water to make a paste, then add 150-200 grams of water and mix thoroughly. Let it sit for 10 minutes. A good pesticide will remain well suspended with fine particles and minimal sedimentation. If the powder settles quickly or the suspension becomes unstable, the product may have expired.
5. Dissolution Method: Best used for suspension pesticides. Place the pesticide with sediment into warm water (50-60°C) and let it sit for one hour. If the sediment slowly dissolves and the mixture becomes clear, the pesticide is still usable. If the sediment remains undissolved or the solution stays cloudy, the product may have failed.
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Aluminum single hung window is a relatively new type of window. Here is a detailed introduction about it:
Structure and opening method:
Structure: Aluminum single hung window is mainly composed of aluminum alloy frame and window sash. Its frame structure is strong and can withstand large weight and pressure to ensure the stability and safety of the window.
Opening method: The window sash is opened and closed by pulling in the vertical direction. This opening method is different from traditional sliding windows or casement windows. It does not occupy the horizontal space indoors or outdoors and is particularly suitable for installation in locations with limited space, such as kitchens, bathrooms, narrow corridors, etc.
Advantages:
Good ventilation:Aluminum single hung windows can be opened to a large extent, so that indoor and outdoor air can circulate fully, effectively improving the indoor ventilation effect. In addition, some aluminum single hung windows can also realize multi-sash linkage to further increase the ventilation area.
Wide field of vision: Due to the particularity of its opening method, aluminum single hung windows will not be blocked by window frames like casement windows when opened, which can provide a wider field of vision and make the indoor space more transparent and bright.
High safety: When the window sash is closed, it fits tightly with the window frame, and with high-quality sealing strips, it can effectively prevent rain, dust, wind and sand from entering the room. At the same time, some aluminum single hung windows are also equipped with safety locks and other devices to enhance the anti-theft performance of the windows.
Easy to clean: The window sash can be tilted inward or outward, which is convenient for users to clean the inside and outside of the window, solving the problem of difficult cleaning of high-rise windows.