Degassing of bundles of single-walled carbon nanotubes in vacuum at 500 K is found to drive the thermoelectricpower (TEP) strongly negative, indicating that the degassed metallic tubes in a bundle are n type. The magnitude of the negative TEP indicates that important asymmetry in the electronic carbon pi bands exists near the Fermi energy. Easily measurable increases in the TEP ( approximately ...

In the present paper Artificial Neural Networks (ANN) are applied in order to predict the buckling modes of thin-walled PVC tubes under compressive axial forces. For the development of the models the neural network toolbox of Matlab ® was applied. The results show that these models can satisfactorily face these problems and they constitute not only a fast method, compared to time consuming expe...

We report the self-assembly of single crystals of single-walled carbon nanotubes (SWCNTs) using thermolysis of nano-patterned precursors. The synthesis of these perfectly ordered, single crystals of SWCNTs results in extended structures with dimension on the micrometer scale. Each crystal is composed of an ordered array of tubes with identical diameters and chirality, although these properties ...

Analyses were carried out on twice-recrystallized freeze-dried urease (Bailey & Boulter, 1969) that had previously been dialysed for 24hr. in the cold against running tap water, and then for 24hr. against three changes of deionized water. Acid hydrolysis of urease (5mg.) was carried out at 1100 in evacuated heavy-walled Pyrex tubes with threetimes-redistilled 5-7M-hydrochloric acid at a concent...

Technically relevant fluid-structure interaction simulation of detonation-induced dynamic response of thin-walled solid structures requires an efficient detonation solver that can cope with large deformations as well as arbitrary topology changes of the computational domain. We present a parallel adaptive method that uses a scalar level set function to represent embedded evolving solid boundari...

We demonstrate a new method (U.S. Patent Appl., serial no. 60/908039) for synthesizing carbon nanotubes (CNTs), using first-principles and classical molecular dynamics simulations. The single-walled nanotubes (SWNTs) are formed by folding graphene nanoribbons patterned on graphite films through adsorption of atoms of varying coverage, which introduces an external stress to drive the folding pro...

High performance electrolyte-gated carbon nanotube transistors Sami Rosenblatt, Yuval Yaish, Jiwoong Park, Jeff Gore, Vera Sazonova, and Paul L. McEuen Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853 Department of Physics, University of California, Berkeley, CA 94720 Abstract We have fabricated high performance field-effect transistors made from semiconducting...

The images are from a 19-year-old female immigrant from Central America who presented with primary amenorrhea. Pelvic ultrasound (A) shows the presence of intrauterine synechiae vs. septum with punctate cal-cification. Hysterosalpingogram (B) shows a smooth-walled filling defect within the endometrial cavity and obstructed fallopian tubes. The endometrial cavity was also viewed by hysteroscopy ...

The electronic properties of p-doped single-walled carbon nanotube SWNT bulk samples were studied by temperature-dependent resistivity and thermopower, optical reflectivity, and Raman spectroscopy. These all give consistent results for the Fermi level downshift EF induced by doping. We find EF 0.35 eV and 0.50 eV for concentrated nitric and sulfuric acid doping respectively. With these values, ...

We have measured the temperature-dependent thermoelectric power (TEP) of crystalline ropes of single-walled carbon nanotubes. The TEP is large and holelike at high temperatures and approaches zero as T ! 0. The results argue against the opening of a gap at low temperature in these materials. When derived from a simple band structure picture, the TEP of a single metallic nanotube is significantl...