7,804 research outputs found
Effects of Finite Deformed Length in Carbon Nanotubes
The effect of finite deformed length is demonstrated by squashing an armchair
(10,10) single-walled carbon nanotube with two finite tips. Only when the
deformed length is long enough, an effectual metal-semiconductor-metal
heterojunction can be formed in the metallic tube. The effect of finite
deformed length is explained by the quantum tunnelling effect. Furthermore,
some conceptual designs of nanoscale devices are proposed from the
metal-semiconductor-metal heterojunction.Comment: 4 pages, 4 figure
High Altitude Steel Roof Truck Crane Installation
In order to solve the problems of crane operating range in blind areas and insufficient weight support of crane for steel structure bubble roof lifting construction, it is a must to design propelling crane on the roof, so that it can move on selected routes, completing the lifting work of steel roofing bubble. Mainly introduce the technical measures and related technical preparation of propelling crane on the roof for steel structure lifting process, to ensure the originality of steel structure during lifting process and safety of construction work,also to guarantee the progress of steel structure lifting work
Structural Trends Interpretation of the Metal-to-Semiconductor Transition in Deformed Carbon Nanotubes
Two mechanisms that drive metal-to-semiconductor transitions in single-walled
carbon nanotubes are theoretically analyzed through a simple tight-binding
model. By considering simple structural trends, the results demonstrate that
metal-to-semiconductor transitions can be induced more readily in metallic
zigzag nanotubes than in armchair nanotubes. Furthermore, it is shown that both
mechanisms have the effect of making the two originally equivalent sublattices
physically distinguishable.Comment: 4 pages, 4 figure
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