We report preliminary results of a three-dimensional simulation of the buoyant rise of a strongly twisted, kinkunstable magnetic flux tube through a gravitationally stratified layer representing the solar convection zone. The numerical calculations employ the well-known anelastic approximation, which is suitable for studying slow, subsonic dynamical processes in the pressure-dominated, high-b p...

In this paper we develop vacuum-actuated polyimide bi-stable actuators using buckled diaphragms for applications in the field of MEMS. The fabrication process involves a single mask step and DRIE etch step to fabricate the buckled bi-stable diaphragms. Compressive stresses in a companion thermal oxide layer provide pre-stress in the polyimide mechanical films that initiates diaphragm buckling u...

The transport properties, work functions, electronic structure, and structural stability of boron nanotubes with different lattice structures, radii, and chiralities are investigated theoretically. As the atomic structure of boron nanotubes and the related sheets is still under debate, three probable structural classes (nanotubes derived from the α-sheet, the buckled triangular sheet, and the d...

All carbon electronics based on graphene have been an elusive goal. For more than a decade, the inability to produce significant band-gaps in this material has prevented the development of graphene electronics. We demonstrate a new approach to produce semiconducting graphene that uses a submonolayer concentration of nitrogen on SiC sufficient to pin epitaxial graphene to the SiC interface as it...

The naphthalene fused ring of the title compound, C(12)H(4)Br(2)F(6)O(6)S(2), is slightly buckled (r.m.s. deviation = 0.036 Å) along the common C-C bond and the benzene rings are twisted by 3.2 (3)°. The two trifluoro-methyl-sulfonyl groups lie on opposite sides of the fused-ring system. The crystal structure features short inter-molecular F⋯F contacts [2.715 (4) and 2.832 (4) Å].