This disease occurs mostly in the late stage of large eared larvae, and it is more likely to occur when the high temperature period and the density of larval rearing are high from June to July each year. The disease has been found in both Shandong and Liaoning provinces, and the incidence rate has increased year by year. The symptoms of death are mainly manifested as: the larval stomach wall is thickened and rough, the peripheral boundary of the stomach becomes blurred, and then the atrophy becomes small and deformed. In severe cases, the entire stomach wall is eroded, which may eventually lead to the death of the larvae. The diseased larvae have decreased feeding ability or no feeding, stunting, and irregular shape, and the rate of metamorphosis from auricular larvae to scorpion larvae is low.
On the one hand, the cause of the disease is due to the poor quality of the bait, such as feeding the aging, the precipitation of the unicellular algae bait, or the bait nutrient single, such as feeding algae, spirulina and other bait. On the other hand, some bacterial infections in larvae can also cause this disease to occur. The author has now isolated 2 strains of pathogenic bacteria, and its classification and identification are underway.
There are two main control measures: on the one hand, feeding fresh and palatable bait such as Chaetoceros, salt algae or marine yeast to meet the needs of larval development and growth: on the other hand, increase the amount of water change and reduce the amount of bacteria in the water. The use of furan antibiotics 3 × l0-6 ~ 5 × 10-6 medicated bath has a good effect.
High-power LED Lamp Beads are a kind of LED Lamp Beads. Compared with low-power LED lamp beads, high-power LED lamp beads have higher power, brighter brightness and higher price. Low-power LED lamp beads have a rated current of 20mA, and those with a rated current higher than 20mA can basically be counted as high-power. The general power numbers are: 0.25w, 0.5w, 1w, 3w, 5w, 8w, 10w and so on. The main brightness unit is lm (lumens), and the low-power brightness unit is generally mcd (millicandela, 1cd=1000mcd), which is the luminous intensity I. High-power lamp beads generally refer to imitated lumen lamp beads, just like the shape of a picture. SMD's are higher than 20MA. It is not called high power.
1cd=1 lm/sr (lumens/three-dimensional radian)=1 candlelight. It is explained as: the luminous flux emitted by the light source within the solid angle dΩ in the specified direction or the luminous flux dΦ transmitted by the obtained light source, the quotient of the two is the luminous intensity I (unit is candela, cd). The outer cover can be made of PC tube, which can withstand high temperature up to 135 degrees. PC tube made of LED cover, the internal temperature can reach 135 degrees, and the external temperature can resist -45 degrees without cracking
As an emerging green, environmentally friendly, energy-saving light source, it is widely used in car lights, flashlights, lamps and other places. The reason why LED high-power is called this is mainly for low-power LEDs. I have summarized three classification standards: The first one is that according to the power size can be divided into 0.5W, 1W, 3W, 5W, 10W... 100W varies, depending on the total power of the molded product after packaging.
The second type can be divided into different packaging processes: large-size epoxy resin packaging, piranha-like epoxy resin packaging, aluminum substrate (MCPCB) packaging, TO packaging, power SMD packaging, MCPCB integrated packaging, etc.
The third type can be divided into low-light-attenuation high-power products and non-low-light-attenuation high-power products according to its different degrees of light attenuation.
Of course, since there are many parameters of high-power LEDs, there will be different classification standards according to different parameters, so I will not repeat them here.
High-power LED lamp beads white light
High-power LED lamp beads white light
LED high-power is still one of the LED packaging products, and it is the most important part in the field of general lighting for semiconductor lighting.
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