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Optical centres Occ. Occupation OD oculus dexter (right eye) OH Ocular history OMB Oculo motor balance ONH Optic nerve head Oph Ophthalmoscopy OS oculus sinister (left eye) OU oculus uterque (both eyes) PD Pupillary distance PERRLA Pupils equal, round, reactive to light and accommodation PH Pinhole
ABB Group is a Swedish-Swiss multinational electrical engineering corporation. Incorporated in Switzerland as ABB Ltd., and headquartered in Zurich, [1] it is dual-listed on the SIX Swiss Exchange in Zurich and the Nasdaq Nordic exchange in Stockholm, Sweden. [6]
Utilizing a single-ended optical fiber wrapped around the current conductor, [1] FOCS exploits the magneto-optic effect (Faraday effect). [2] The FOCS can measure uni- or bi-directional DC currents up to 600 kA, with an accuracy within ±0.1% of the measured value. [3] [4]: 2 [5]
In optics and lens design, the Abbe number, also known as the Vd-number or constringence of a transparent material, is an approximate measure of the material's dispersion (change of refractive index versus wavelength), with high values of Vd indicating low dispersion.
If you're having issues sending and receiving emails for your AOL Mail account in a third-party email application, you may need to reauthenticate your account by removing and re-entering your password or removing and re-adding your AOL Mail account. Get the steps for common third-party email applications. Account Management · Dec 9, 2024
In July 2020, ABB divested its power grid business and sold 80.1% of that to Hitachi Ltd., leading to the formation of Hitachi ABB Power Grids. [1] In October 2021, Hitachi ABB Power Grids changed its company name to Hitachi Energy. In December 2022, it was confirmed that Hitachi acquired the remaining 19.9 percent shares from ABB Ltd. [2]
An optical instrument is said to be diffraction-limited if it has reached this limit of resolution performance. Other factors may affect an optical system's performance, such as lens imperfections or aberrations , but these are caused by errors in the manufacture or calculation of a lens, whereas the diffraction limit is the maximum resolution ...
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