The crab crab pool management points
1. Selection of wintering pools. Pro-crabs are generally wintered in outdoor earthen ponds. Over-wintering ponds should be selected where they are sheltered from the wind, sunny, close to water, and where the environment is relatively quiet, east-west, rectangular or square earthen ponds, water depths of more than 1.5 meters, and clay soil or clay is preferred. 2. Water quality regulation. During the winter of holding eggs and crabs, when the water body is frozen, insert a proper amount of grass handles and break ice before the sun rises every morning to clean the snow on the ice. Focus on maintaining a relatively stable water environment, the main water quality indicators are monitored once every two weeks, salinity of about 25 ,, dissolved oxygen more than 5 mg per liter, pH value of 7.8 to 8.7 as well. Leaked earthen ponds shall be filled with water once every 5 days to 7 days. The amount of water exchanged shall not exceed 30% of the total body of water to maintain the water level above 1.5 meters. When more than 5°C is reached, fresh seawater must be added and replaced regularly. 3. Feed feeding. Choose nutritious fresh live bait, such as sand, fresh fish, malt and so on. After the pro-crabs hold eggs, with the continuous change of water temperature, depending on food intake, the daily feeding amount is generally controlled to be 2% to 10% of the total weight of the pro-crab. No matter how the surface water temperature changes, as long as there is a pro crab activity, it is necessary to feed it properly. Feed it once a day before sunset, put the feed below the water level along the soil pool, check the feeding situation on the second day, remove the residual bait, and adjust the feeding amount. A variety of bait species to alternate feeding. Water temperature above 8 °C to feed fresh bait and with bait. 4. Daily management. Every morning and evening, one or more patrols are performed to observe the activities of the crabs, the feeding conditions, and changes in the water color; check whether the escape prevention facilities are damaged; check the fertilized eggs of the brooding crabs regularly every half a month. Take and adjust management measures to ensure that the egg-bearing crabs have passed the winter.
DVR 5MP, also called the Digital Video Recorder DVR 5MP/ Digital Video Recorder 5MP/ DVR CCTV 5MP/ DVR 5MP 4CH/ 5MP HD DVR/ 5MP DVR Security System, means that this Digital Video Recorder has 5 million pixels.
So what does 5MP pixels stands for?
In conclusion, we should pick up the most suitable pixels when we choose the security cameras and DVRs.
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The letter "M" means million, and the letter "P" means pix, so 5MP means 5 megapixels. MP refers to MegaPixel.Some cameras only display 1M, 3M, 5M, etc.,. more specifically speaking, 5MP means that the camera is set at 5 million pixels to take photos. By analogy, 3MP is 3 million pixels, and 16MP is 16 million pixels.
So does the pixel mean?
The pixel refers to the smallest unit in an image represented by a sequence of numbers.
The pixel is composed of the small aquares of an image. These small squares have a clear position and assigned color value in this image, and the color and position of the small squares can determine what this image looks like. We can regard the pixel as the indivisible unit or element in the entire image. The pixel is indivisible, which means it can't be cut into smaller units or elements because it exists as a single color grid. Each bitmap image contains a certain amount of pixels, which can determine the size of the image on the screen.
The pixel for the camera actually means the maximum pixel. Pixel is the unit of resolution. This pixel value only refers to the maximum effective resolution the camera supports.
For example, the resolution of 0.3MP is 640×480, 0.5MP is 800×600, 0.8MP is 1024×768 5" (3.5×5 inches), 1.3MP is 1280×960 6" (4×6 inches), 2MP is 1600×1200 8" (6×8 inches) 5" (3.5×5 inches), 3.1MP is 2048×1536 10" (8×10 inches) 7" (5×7 inches), 4.3MP is 2400×1800 12" (10×12 inches) 8" (6×8 inches), 5MP is 2560×1920 12" (10×12 inches) 8" (6×8 inches), 6MP is 3000×2000 14" (11×14 inches) 10" (8×10 inches), 8MP is 3264×2488 16"(12×16 inches) 10" (8×10 inches), 11MP is 4080×2720 20" (16×20 inches) 12" (10×12 inches), 14MP is 4536×3024 24" (18×24 inches) 14" (11×14 inches), and all these are the approximate dimensions.
When we measure the picture size in pixels, we need to specify its fixed resolution first, then we can convert the picture size to the actual size. For example, the commonly used resolution of the pictures in the web page making is 72, that is, 72 pixels per inch, and 1 inch is equal to 2.54 cm. Then, through conversion, we can know that each cm is equal to 28 pixels; another example is a picture with the size of 15x15 cm, which is equal to 420*420 pixels.
DPI means ** dots per inch
LPI means ** lines per inch
PPI means **pixels per inch
