The pesticides composed of hydrocarbons are collectively referred to as organic pesticides. There are many kinds of organic pesticides, and the structure is relatively complicated. The types of organic pesticides can be divided into five categories: insecticides , fungicides, and acaricides. Let us discuss them together. .
Organic insecticides: including organophosphorus, organochlorines, carbamates, pyrethroids, specific insecticides, etc.
Organic acaricides: including specific tin-containing organic acaricides and non-tin organic acaricides.
Organic fungicides include dithiocarbamates, decanoimides, benzimidazoles, diimides, organophosphorus, phenylamides, sterol biosynthesis inhibitors, and the like.
Organic herbicides : including phenoxycarboxylic acids, trozabenzenes, substituted urethanes, carbamates, amides, benzoic acids, diphenyl ethers, dinitroanilines, organophosphorus, sulfonyl Urea and the like.
Plant growth regulators: mainly auxins, gibberellins, cytokinins and the like.
Most organic pesticides are neutral, so they are easy to decompose under strong alkali or strong acid conditions. Farmers' friends must pay attention to them. If you want to get more knowledge about pesticides , please pay attention to China's pesticide network.
The outermost layer of resistance screens is usually a soft screen that connects the internal contacts up and down by pressing. The inner layer contains the oxidized metal of the physical material, namely N-type oxide semiconductor (indium oxide), also known as indium oxide, with an optical transmittance of 80% and the upper and lower layers separated by the middle. ITO is the main material used in both resistive and capacitive touch screens. Their working surface is the ITO coating. The outer layer is pressed by fingertips or any object to make the surface film concave and deformed. According to the leading line number of screen, divide again have 4 line, 5 line and much line, threshold is low, cost is opposite cheap, advantage is not affected by dust, temperature, humidity. Disadvantages are also obvious, the outer screen film is easy to scratch, can not use sharp objects to touch the surface. In general, multi-touch control is not allowed, that is, it can only support a single point. If two or more contacts are pressed at the same time, they cannot be recognized and accurate coordinates can be found. To enlarge a picture on the resistance screen, you can only click "+" several times to make the picture be enlarged step by step. This is the basic technical principle of the resistance screen.
Control by pressure induction. When a finger touches the screen, the two conductive layers are in contact at the touch point and the resistance changes. A signal is generated in both X and Y directions and transmitted to the Touch Screen controller. The controller detects the contact and calculates the position of (X, Y), then works according to the simulated mouse mode. Resistive Touch screen is not afraid of dust, water and dirt, and can work in harsh environments. But because the outer layer of the composite film is made of plastic material, its anti-explosion property is poor, and its service life is affected to some extent.
The resistive touch screen is controlled by pressure induction. The surface layer is a layer of plastic and the bottom layer is a layer of glass, which can withstand the interference of harsh environmental factors. However, it has poor hand feel and light transmittance, so it is suitable for wearing gloves and occasions that cannot be touched directly by hand.
Resistive Touch Screen
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