Photosynthetic Photon Flux Density General Definitions: PPFD represents the quantum number of light in the visible wavelength range over a unit time area. The unit is μmol/m2s PPFD indicates the correlation between the number of photons and photosynthesis. In SGAL, you can not only confirm the value of all visible PPFD, but also compare the values ​​in different ranges. You can also confirm the different ranges of data when adjusting the lamps. (UV light is 380~399nm, blue is 400~499nm, green is 500~599nm, red is 600~700nm, near-infrared light is 701~780nm) Effective Photon Flux Density YPFD (Yield Photon Flux Density) General definition: Because PPFD is calculated from known spectra, not directly related to plant illumination reactions. In order to confirm the effectiveness of illumination on plants, the effective spectral value of PAR must be weighted to obtain the effective photon flux density (YPFD), and this value will vary depending on the reference PAR effective spectrum change. In SGAL, you can not only compare all visible YPFD values, but also compare the differences in lighting adjustments. A pet Strap Dog Harnessis is equipment consisting of straps of webbing that loop nearly around-that fasten together using side release buckles-the torso of an animal.
These strap dog harnesses generally are made to have both a strap on the chest in front of the forelimbs, and a strap around the torso behind the forelimbs, with straps in between connecting these two. Having a D-ring suitable for (pet tags and) a leash to clip to, they are most often used to restrain an animal, but dogs also particularly wear them to assist a person with a disability or haul people and items. There is also the lifting harness for dogs with disabilities, covered in this article.
Some come in different sizes, although many are size-adjustable with tri-glide slides to loosen or shorten the straps` length. The straps may come in a range of different colors, and some have reflective coating.
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What is the difference between photon flux density PPFD and YPFD?