122 research outputs found
The cubic period-distance relation for the Kater reversible pendulum
We describe the correct cubic relation between the mass configuration of a
Kater reversible pendulum and its period of oscillation. From an analysis of
its solutions we conclude that there could be as many as three distinct mass
configurations for which the periods of small oscillations about the two pivots
of the pendulum have the same value. We also discuss a real compound Kater
pendulum that realizes this property.Comment: 25 pages 4figure
The low-energy electron point source microscope as a tool for transport measurements of free-standing nanometer scale objects: application to carbon nanotubes
We have developed a simple and reliable technique for two-terminal transport
measurements of free-standing wire-like objects. The method is based on the
low-energy electron point source microscope. The field emission tip of the
microscope is used as a movable electrode to make a well-defined local
electrical contact on a controlled place of a nanometer-size object. This
allows transport measurements of the object to be conducted. The technique was
applied to carbon nanotube ropes.Comment: 4 pages, 4 figures; submitted to J. Vac. Sci. Tech.
THE EFFECT OF NEAR-INTERFACE NETWORK STRAIN ON THE MOBILITY OF PROTONS IN Si02
35-word abstract Our data suggest a correlation between near-interface strain in SiOz and the ratio of fixed vs. mobile positive charge generated at the interface during forming gas annealing. A model based on firstprinciples quantum mechanical calculations supports this correlation
Electron Wave Function in Armchair Graphene Nanoribbons
By using analytical solution of a tight-binding model for armchair
nanoribbons, it is confirmed that the solution represents the standing wave
formed by intervalley scattering and that pseudospin is invariant under the
scattering. The phase space of armchair nanoribbon which includes a single
Dirac singularity is specified. By examining the effects of boundary
perturbations on the wave function, we suggest that the existance of a strong
boundary potential is inconsistent with the observation in a recent scanning
tunneling microscopy. Some of the possible electron-density superstructure
patterns near a step armchair edge located on top of graphite are presented. It
is demonstrated that a selection rule for the G band in Raman spectroscopy can
be most easily reproduced with the analytical solution.Comment: 7 pages, 4 figure
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The Effect of Near-Interface Network Strain on the Mobility of Protons in SiO{sub 2}
Our data suggest a correlation between near-interface strain in SiO{sub 2} and the ratio of fixed vs. mobile positive charge generated at the interface during forming gas annealing. A model based on first-principles quantum mechanical calculations supports this correlation
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