A study of the mean-square displacement amplitudes (MSDA) of the T(Al,Si) and 0 atoms in ordered framework silicates and aluminosilicates indicates that the sizes, shapes, and orientations of the displacement ellipsoids in these crystals are consistent with a rigid bond model. In particular, the MSDAs of the T and 0 atoms in the direction of the TO bonds tend to be equal and to increase with te...

We propose structural and electronic properties of recently synthesized SiC nanotubes. The nanotubes with a Si to C ratio of 1:1 exhibit rich morphologies and are shown to belong to two distinct categories that are close in energies but show significant differences in electronic and transport properties. Similarities and differences are invoked with the case of BN nanotubes to explain the obser...

This paper presents a harmonic+noise speech coder which uses an efficient spectral quantization technique and a novel voiced/unvoiced (V/UV) mixing model. The harmonic magnitudes are coded at 23 bits/frame using the magnitude response of a linear predictive coding (LPC) system. The difference between the harmonic magnitudes and the sampled magnitude response is minimized by the closed-loop appr...

Hui Xue, Andreas Greiser, Christoph Guetter, Sven Zuehlsdorff, Marie-Pierre Jolly, Andrew E. Arai, Jens Guehring, and Peter Kellman Siemens Corporate Research, Princeton, New Jersey, United States, Imaging & IT Division, Siemens AG, Healthcare Sector, Erlangen, Germany, CMR R&D, Siemens Medical Solutions USA, Inc., Chicago, IL, United States, Laboratory of Cardiac Energetics, National Institute...

This paper explores the utility of assemblage theory for intergenerational counter-mapping and, through this, for reconfigurations of indigeneity. Counter-mapping is theorised as a kind of assemblage that, through intergenerational learning, is fundamentally memetic (composed of evolving units of information) in nature. Assemblage is theorised as having three aspects (relations of exteriority, ...

introduction:  the  advent  of  dual-modality  pet/ct  scanners  has  revolutionized  clinical  oncology  by  improving lesion localization and facilitating treatment planning for radiotherapy. in addition, the use of  ct images for ct-based attenuation correction (ctac) decreases the overall scanning time and creates  a noise-free  attenuation  map  (6map).  ctac  methods  include  scaling,  s...

We report on a preliminary global geologic map of Vesta, based on data from the Dawn spacecraft’s HighAltitude Mapping Orbit (HAMO) and informed by Low-Altitude Mapping Orbit (LAMO) data. This map is part of an iterative mapping effort; the geologic map has been refined with each improvement in resolution. Vesta has a heavily-cratered surface, with large craters evident in numerous locations. T...