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Hace 3 horas · Diffraction gratings, as a precision optical instrument, have also been introduced for rotational speed measurement , as shown in Fig. 9b. A three-beam optical pickup receives the light reflected from the diffraction grating and outputs an electrical signal whose period is related to the rotational speed.
Hace 1 día · Deoxyribonucleic acid (/ d iː ˈ ɒ k s ɪ ˌ r aɪ b oʊ nj uː ˌ k l iː ɪ k,-ˌ k l eɪ-/ ⓘ; DNA) is a polymer composed of two polynucleotide chains that coil around each other to form a double helix.The polymer carries genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses.DNA and ribonucleic acid (RNA) are nucleic acids.
