“helicoid”的概念、定义、翻译、参考文献-科学参考

单词	helicoid
释义	helicoid Mathematics A helicoid is a ruled surface which can be parametrized by $x (r, θ) = r cos (a θ), y (r, θ) = r sin (a θ), z (r, θ) = θ .$ A curve of constant r is a helix. Fixing θ‎ = 0 gives the x-axis; the helicoid is generated moving the x-axis up and down the z-axis, rotating the generating line at a constant angular speed a. The helicoid is, aside from the plane, the only ruled surface which is also a minimal surface. A helicoid
随便看	areal scouring area of a surface of revolution Area of Outstanding Natural Beauty area photometer area sampling area studies area under a curve Arecibo Observatory areic arenaceous Arendt, Hannah (1906–75) Arend–Roland, Comet arene complex arenes Arenicolites Arenig arenite arenium ion arenosols areo- areolar connective tissue areology Areopagus aretē arfvedsonite

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