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The phrase "a upright" is not correct in written English.
The correct form is "an upright" because "upright" begins with a vowel sound.
Example: "He stood in an upright position, ready to address the audience."
Alternatives: "an erect" or "a vertical".
Exact(17)
Without voluntary periodic movement (condition A: upright), the median apparent mass resonance frequency was 5.47 Hz at the low vibration magnitude and 4.39 Hz at the high vibration magnitude.
Two nanomaterial-based sensor platforms were used: (a) upright single wall carbon nanotube forests and (b) layers of densely packed 5 nm gold nanoparticles.
Similar trend is observed for profile A upright with 1.8 mm thickness.
The profile A upright with 3 tab connector is tested with the beam depth of 75 mm.
The profile A upright with 4 tab connector is tested with 4 different beam depths of 87.5, 100, 110 and 125 mm.
The profile A upright has two different thicknesses, 1.6 and 1.8 mm and the profile B upright has three different thicknesses 1.8, 2.0 and 2.5 mm.
Similar(43)
He switched from an upright bike a few years ago.
Judge Gerald W. Hardcastle is a community pillar, an upright, modest man.
Bosendorfer 290 Imperial; £98,000 RRP A grand or an upright?
But putting just-off-the-boil soup in an upright is a tad dangerous.
Connacht's Dan Parks shaved an upright with a late drop goal attempt.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com