Origami patterns, including the rigid origami patterns in which flat inflexible sheets are joined by creases, are primarily created for zero-thickness sheets. In order to apply them to fold structures such as roofs, solar panels, and space mirrors, for which thickness cannot be disregarded, various methods have been suggested. However, they generally involve adding materials to or offsetting panels away from the idealized sheet without altering the kinematic model used to simulate folding. We develop a comprehensive kinematic synthesis for rigid origami of thick panels that differs from the existing kinematic model but is capable of reproducing motions identical to that of zero-thickness origami. The approach, proven to be effective for typical origami, can be readily applied to fold real engineering structures.
The MM-FD technique substantially improves the estimation accuracy for onboard 4D-CBCT using prior planning 4D-CT and limited-angle projections, compared to the MM-only and FD-only techniques. It can potentially be used for the inter/intrafractional 4D-localization verification.
The collision of the Sino-Korean and Yangtze blocks to form a significant part of China is recorded in the Qinling, Tongbai, and Dabie Mountains. Radiometric ages of the ultrahighpressure metamorphic rocks in the South Qinling orogenic belt suggest that subduction and collision took place during the Triassic Period. Our new 40 Ar/ 39 Ar geochronology of units in the North Qinling orogenic belt confirms that high-grade metamorphism and deformation took place also during the Silurian-Devonian and Carboniferous Periods. These results imply that the amalgamation of eastern China was a multistage process extending over at least 200 m.y. GEOLOGY, April 1998Figure 4. Disturbed spectra and inverse correlation diagrams. Abbreviations: MSWD-mean squared weighted deviations; others as in Figure 3. A: Locality 3. Saddle-shaped hornblende spectrum from Erlangping amphibolite. B: Locality 3. Inverse correlation diagram yielding isochron age of 404 Ma; the trapped component has 40 Ar/ 36 Ar = 1019, significantly higher than the atmospheric value of 295.5. C: Locality 5. Disturbed spectrum yields only a total fusion age of 365 ± 2 Ma. D: Locality 5. Inverse correlation diagram defines isochron age of 304 Ma with 40 Ar/ 36 Ar ratio of 5026.
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