WTC2005-63602 EFFECTS OF TUBE DIAMETER ON FRICTIONAL CHARACTERISTICS OF CARBON NANOTUBES

ABSTRACT Frictional characteristics of carbon nano-tube powders were measured and compared with those of conventional solid lubricants, MoS 2 and graphite. In linear one way sliding tests, a multi-wall CNT showed similar coefficient of friction with graphite. It was also showed that the larger the particle sizes, the smaller the COF for those powders. A sliding model considering CNT geometry was proposed. INTRODUCTION Carbon nano-tubes (CNTs) are now studied extensively for mechanical applications to utilize their high strength and high elastic modulus in addition to electrical and thermal applications One report showed the coefficient of friction (COF) of 0.3 for a multi-wall CNT (MWCNT) fil

The nuclear hexadecapole interaction of iodine-127 in cadmium iodide measured using zero-field two dimensional nuclear magnetic resonance

Two dimensional nuclear quadrupole correlation spectroscopy has been used to measure simultaneously the two nuclear spin transition frequencies for the iodine resonance of cadmium iodide at zero magnetic field. Because of the layer structure and resultant polymorphism in this substance, conventional zero-field NMR spectra are inhomogeneously broadened by several hundred kHz. However, the 2D spectra obtained by our method are subject only to homogeneous line-width, which for this compound is of the order of 5 kHz. This greatly increased precision allows more accurate evaluation of the nuclear hexadecapole coupling- in cadmium iodide; which we measure as 0.216 ±0.514 kHz (i.e., indistinguishable from zero). This gives a maximum value of the nuclear hexadecapole moment several times lower than that recently reported for the same nucleus in potassium iodide

Effect of the History of Cross-Sectional Mean Velocity on the Transition to Turbulence in Transient Circular Pipe Flow

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An epidemiologic examination on the prevalence of the periodontal diseases and oral pigmentation in Yusho patients in 2002

http://sciencelinks.jp/j-east/article/200321/000020032103A0636992.ph

J=21J = ^1_2 pseudospins and d−pd − p hybridization in the Kitaev spin liquid candidates RuX3RuX_3 ( X =Cl, Br, I)

The recent synthesis of ruthenium trihalides $RuX_3$ ( = Cl, Br, I) has enlarged the set of material candidates for Kitaev spin liquids. The realization of the Kitaev model necessitates the formation of $J = ^1_2$ pseudospins in the octahedral crystal field. We use Ru $_3$-edge resonant inelastic x-ray scattering to investigate the evolution of multiplet structures in $RuX_3$. We identified quasielastic magnetic correlations and spin-orbit transitions to the $J = ^3_2$ states without discernible trigonal splitting, thereby validating the $J = ^1_2$ description of magnetism in the $RuX_3$ family. Lineshape broadening in $RuX_3$ provides evidence for its bulk metallicity in the vicinity of a bandwidth-controlled metal-insulator transition. Our results highlight the pivotal role of halogen orbitals in controlling the electronic properties of $RuX_3$