Six points for excavation of high-yield fish ponds
Compared with other farming and animal husbandry cultivation and breeding, aquaculture has less relative investment, high efficiency, low risk, and quick effect. Therefore, aquaculture has received more and more attention from some people and has become an effective way to get rich in the new countryside. Excavation of fish ponds should be preceded by planning. The following six points must be noted when scientifically excavating fish ponds: First, the choice of location must first choose to ensure water quality, environmental pollution-free venues, at the same time to fully consider the protection of long-term rain, long-term clear and dry, adequate water sources, can be poured at any time; Second, the pool shape selection pool shape is as much as possible rectangular, east-west, pool depth of 2.5 to 3 meters, impounding 2 to 2.5 meters, an area of ​​about 10 acres per mouth; Third, into the drainage set up to enter the water unimpeded, drainage should be convenient and thorough, there is water into the fish pond, can naturally flow or mechanical irrigation filling new water, it is best to set the bottom of the pool drainage pipe, in order to completely self-discharge . Generally, the inlet and outlet are preferably located on the opposite side of the fish pond. The water intake and drainage between the fish ponds should be independent and independent, and there should be no “over-water pondsâ€. This will facilitate water level water quality regulation and healthy farming. Fourth, the fish pond excavation is best to use mechanical construction, dam slopes 1:2 to 2.5, and each earth dam 0.8 to 1 meter high rolling once to prevent leakage of water. Anti-escape grilles are installed at the inlet and outlet to prevent fish and wild fish from entering. Fifth, the high-yield fish pond power channel should be connected to three-phase high-voltage power, in order to use aerators, pumps and bait feeders. The width of the Yuchi dam is at least one 2 to 3 meters wide, and transportation vehicles can directly reach the traffic road along the pond. VI. Economic and beautiful construction of fish ponds Due to topographic planning, the amount of earthwork for excavation is reduced. If designing a scaled and contiguous fishpond, vertical and horizontal arrangement should be made. The layout of the drainage system, power supply lines and traffic roads should be reasonable. This is not only beautiful, but also can reduce the corresponding overall construction investment and provide facilities for production. In addition, it is advisable to provide fish ponds with suitable facilities for grass-fishing or raising livestock and poultry, including dams.
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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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: