| 单词 |
semi-rigid |
| 释义 |
semi-ˈrigid, a. and n.
[semi- 1, 8 l.]
A. adj.
a. Of an airship: having a flexible gas container to which is attached a stiffened keel or framework.
1908Daily Chron. 6 Aug. 1/2 The so-called semi-rigid airships. 1919H. Shaw Text-bk. Aeronautics xvii. 200 The semi-rigid type includes the Forlanini, Lebaudy, etc., of which the envelopes are not rigid, but are stiffened longitudinally by a framework, running the whole length of the envelope. 1935C. G. Burge Compl. Bk. Aviation 148/2 As with non-rigid and semi-rigid airships, a rigid at the start of a journey has its gas space about 90–95 per cent full of hydrogen. 1955,1974[see keel n.1 3 b].
b. gen. Somewhat rigid; having a certain amount of rigidity; semi-rigid theory (see quot. 1959).
1929Rep. & Mem. Aeronaut. Res. Comm. No. 1155. 19 (heading) Specification of a simple type of semi-rigid wing. 1937Jrnl. R. Aeronaut. Soc. XLI. 723 It was..possible to deduce from the semi-rigid theory design recommendations. 1946Nature 30 Nov. 798/2 Rigid frames of triangular and square shapes, and semi-rigid frames. 1959J. L. Nayler Dict. Aeronaut. Engin. 234 Semi-rigid theory, an approximate theory of elastic structure in which the theoretical infinite number of degrees of freedom is represented by a finite number, each being associated with an invariable mode. 1963C. R. Cowell et al. Inlays, Crowns, & Bridges xi. 118 The retainer which is united to a pontic by a semi-rigid joint is called the ‘minor’ retainer.
B. n. A semi-rigid airship.
1920[see rigid n. 2]. 1925E. H. Lewitt Rigid Airship i. 1 The airship may be divided into three classes: non-rigids, semi-rigids, and rigids. 1935C. G. Burge Compl. Bk. Aviation 148/2 The semi-rigid is very similar in operation to the non-rigid. |
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