Everything You Need To Know About LED Lighting
2.LED stands for light-emitting diode.
A diode is an electrical device or component with two electrodes (an anode and a cathode) through which electricity flows - characteristically in only one direction (in through the anode and out through the cathode). Diodes are generally made from semi-conductive materials such as silicon or selenium - substances that conduct electricity in some circumstances and not in others (e.g. at certain voltages, current levels, or light intensities).
2.It`s really simple actually, and very cheap to produce, which is why there was so much excitement when LED lights were first invented!
When a light-emitting diode (LED) has a voltage source connected with the positive side on the anode and the negative side on the cathode, current will flow (and light will be emitted, a condition known as forward bias). If the positive and negative ends of the voltage source were inversely connected (positive to the cathode and negative to the anode), current would not flow (a condition known as reverse bias). Forward bias allows current to flow through the LED and in so doing, emits light. Reverse bias prevents current from flowing through the LED (at least up until a certain point where it is unable to keep the current at bay - known as the peak inverse voltage - a point that if reached, will irreversibly damage the device).
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Before the 1990s, China’s oceanic tuna fishery was almost blank. Since 1993, experts from China have organized special project teams to conduct surveys on tuna resources and the environment and independently research and develop high-efficiency ecological tuna longline fishing tackle to improve fishing efficiency. Successfully developed seven oceanic tuna fishing grounds in China for the first time; established a three-dimensional model of tuna longline hooks for the first time; developed visual simulation angling software; created a tuna fishing ground forecasting model; developed a tuna fishing grounds fishing information service system with independent intellectual property rights. To achieve rapid forecasting of tuna fishery, the forecast accuracy rate reaches 70%, fills the blank of tuna fishery data in the high seas of China's high seas, and develops the technology for acquiring and extracting environmental information of oceanic tuna fishery in China. Nowadays, China has become a major fishing country for tuna resources in the world. . After nearly three years of promotion and application of project achievements, China's oceanic tuna fishing vessels have reached 301, and 372,800 tons of tuna have been harvested. The annual output value is 3.3 billion yuan, accounting for one-third of the total oceanic fishery output value. At present, tuna has become the most common deep-sea fish among people's seafood dishes along with mackerel and mackerel.
Prof. Dai Xiaojie of Shanghai Ocean University’s School of Marine Sciences, who participated in the project, said that in addition to fishing techniques, researchers will continue to explore tuna preservation technology and food safety standards to provide more and better food for the citizens.
LEDs are a simple invention with huge potential to change the lighting industry for the better. Don`t know much about them? Here are three big things you need to know to get your feet under you:
1.What Does LED Stand For?
2.A light-emitting diode is a semiconductor device that emits visible light when an electrical current passes through it. It is essentially the opposite of a photo-voltaic cell (a device that converts visible light into electrical current).
Did You Know? There is a similar device to an LED called an IRED (Infrared Emitting Diode). Instead of visible light, IRED devices emit IR energy when electrical current is run through them.
1.How Do LED Lights Work?
The p-type and n-type materials are created by introducing the original material to atoms of another element. These new atoms replace some of the previously existing atoms and in so doing, alter the physical and chemical structure. The p-type materials are created using elements (such as boron) that have less valence electrons than the intrinsic material (oftentimes silicon). The n-type materials are created using elements (such as phosphorus) that have more valence electrons that the intrinsic material (oftentimes silicon). The net effect is the creation of a p-n junction with interesting and useful properties for electronic applications. What those properties are exactly depends mostly on the external voltage applied to the circuit (if any) and the direction of current (i.e. which side, the p-type or the n-type, is connected to the positive terminal and which is connected to the negative terminal).
Application of the Technical Details to LED Lighting:
During the Chinese New Year this year, more and more tuna fishes have been swimming on dinner tables. And more than a decade ago, this delicious and nutritious deep-sea fish was a “scrubberâ€. The East China Sea Fisheries Research Institute of the Chinese Academy of Fishery Sciences and experts from Shanghai Ocean University have jointly explored the key technologies for the development of ocean tuna resources, allowing ordinary citizens to “have fish every yearâ€.