According to a survey conducted by the China Federation of Logistics and Purchasing, the National Manufacturing Purchasing Managers Index (PMI) was 54% in August 2009, an increase of 0.7 percentage points from the previous month. The index has been above 50% of the critical point for six consecutive months, indicating that the manufacturing economy has continued to rise steadily. LED Lamp Bead light-emitting principle
The terminal voltage of the PN junction constitutes a certain potential barrier. When the forward bias voltage is applied, the potential barrier drops, and the majority carriers of the P region and the N region diffuse to each other. Since the electron mobility is much larger than the hole mobility, a large number of electrons will diffuse into the P region, which constitutes the injection of minority carriers into the P region. These electrons recombine with holes in the valence band, and the energy obtained during recombination is released in the form of light energy. This is the principle of PN junction light emission.
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The momentum of social demand recovery continues to consolidate. In August, the new order index was 56.3%, up 0.8 percentage points from the previous month, the highest since May last year. 17 of the 20 industries are above 50%, and more than 60% of the six industries, including general equipment manufacturing, communications equipment computers and other electronic equipment manufacturing, ferrous metal smelting and rolling processing industries.
Production activities continue to accelerate. In August, the production index was 57.9%, an increase of 0.6 percentage points from the previous month, the highest since May last year. More than 50% of the 16 industries in the 20 industries, including non-ferrous metal smelting and rolling processing industry, ferrous metal smelting and rolling processing industry, general equipment manufacturing and other 7 industries, more than 60%. The employee index was 51.4%, up 0.6 percentage points from the previous month, and was placed above the critical point for three consecutive months, indicating that the demand for manufacturing labor continues to increase.
The pressure on raw material prices has increased. In August, the main raw material purchase price index rose for 9 consecutive months, reaching 62.6%, the highest value since August last year, indicating that the raw material prices of the upstream manufacturing industry increased significantly, and the procurement cost of enterprises increased. Among the 20 industries, only the tobacco industry and special equipment manufacturing industry are slightly less than 50%, of which 13 industries reach more than 60%, and 4 industries are higher than 70%.
Export trends remain uncertain. In August, the new export order index was 52.1%, which was the same as last month. It has remained above 50% for four consecutive months, but the recent rebound is somewhat weak. Only 12 of the 20 industries are below 50%.
Raw material stocks continue to decline. In August, the main raw material inventory index was 48.8%, still below the critical point, indicating that the raw materials inventory of manufacturing enterprises continued to decrease.
1. Voltage, LED lamp beads use low-voltage Power Supply, and the power supply voltage is between 2 and 4V, which varies according to different products, so it is driven by a high-voltage power supply. Safer power supply, especially for public places.
2. Current, the working current is between 0 and 15 mA, and the brightness becomes brighter with the increase of the current.
3. Efficiency, energy consumption is reduced by 80% compared with incandescent lamps with the same luminous efficiency.
4. Applicability, very small, each unit LED chip is 3 to 5 mm square, so it can be prepared into various LED lamp bead shaped devices, and is suitable for variable environments.
5. Color, changing the current can change color. The light-emitting diode can easily adjust the energy band structure and band gap of the material through chemical modification methods to realize red, yellow, green, blue and orange multi-color luminescence. For example, an LED that is red when the current is small, can turn orange, yellow, and finally green as the current increases.
Abstract According to a survey conducted by the China Federation of Logistics and Purchasing, the National Manufacturing Purchasing Managers Index (PMI) was 54% in August 2009, an increase of 0.7 percentage points from the previous month. The index is above 50% of the critical point for six consecutive months, indicating that the manufacturing economy is generally stable...