Infrared measurements at room temperature have shown that the hydrogen-bond symmetrization occurs 62.1 GPa in ice. The OH stretching frequency initially located 3500 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ ambient pressure falls toward zero around 60 GPa. An absorption band appears low-frequency region below 800 about 65 GPa, growing a definite peak with shift to high by further compression. Such turn dependence of is an evidence for transition from ice VII symmetric X. bending disappears...

12 patients who had histological proven ganglioneuromas were investigated by computed tomography (CT) and magnetic resonance (MR) imaging. CT scans (n = 11), conventional spin-echo MR images 10) dynamic 5) acquired. All lesions showed a well defined, oval shape. Five (42%) calcification which was punctate in four coarse one on CT. attenuation predominantly low three of 10 (30%) intermediate the remaining seven (70%). In all signals mainly intensity T1 weighted (T1WI) high T2 (T2WI). Dynamic...

The first-order Raman scattering by TO and LO phonons has been measured in GaSb, InAs, InSb under hydrostatic pressures up to their phase transitions. frequencies increase nearly linearly while the LO-TO splitting decreases with increasing pressure. intensities display strong enhancement as ${E}_{1}$ band gaps approach laser volume dependence of transverse effective charges is interpreted means pseudopotential calculations. resonance behavior discussed terms resonant near gaps.

The vapor-deposited low-density amorphous phase of H 2 O was directly compressed at 77 kelvin with a diamond-anvil cell, and the boundary between high-density observed while sample warmed under compression. transition from to distinct reversible in an apparently narrow pressure range ∼130 ∼150 kelvin, which provided experimental evidence for polymorphism O.

X-ray diffraction study of solid CO(2) at room temperature has shown that the powder pattern high-pressure phase, which supersedes low-pressure cubic Pa3 phase about 10 gigapascals, is consistently interpreted in terms an orthorhombic Cmca structure. The cell 11.8 gigapascals dimensions 4.330 +/- 0.015, 4.657 0.005, 5.963 0.009 angstroms for its a, b, and c faces, respectively, a volume 120.3 0.5 angstroms. Four molecules contained unit are located base-centered positions with their...

Three high-pressure structures of methane hydrate, a hexagonal structure (str.A) and two orthorhombic (str.B str.C), were found by in situ x-ray diffractometry Raman spectroscopy. The well-known I (str.I) decomposed into the str.A fluid at 0.8 GPa. transformed str.B 1.6 GPa, further str.C 2.1 GPa which survived above 7.8 solidified as ice VI 1.4 to VII structural changes occurring with increasing pressure observed reversibly decreasing pressure. symmetric stretching vibration, ν1, molecule...

The mechanism and kinetics of the pressure-induced polymerization acetylene were studied by Raman spectroscopy. reaction occurred in orthorhombic phase at room temperature pressures above 3.5 GPa. Dominant formation trans-polyacetylene suggested that monomer underwent trans opening triple bond polymerized along diagonal bc plane unit cell. was described as an idealized one-step one-dimensional growth process Avrami equation with exponent 1.34.

We have studied the structure of nanometer-sized silica particles called fumed silica, which is a synthetic amorphous silicon dioxide produced by burning tetrachloride in an oxygen-hydrogen flame, using infrared and Raman spectroscopies high-energy x-ray diffraction method. It has been demonstrated that not identical to normal bulk glass terms especially distribution size rings. Three- four-membered rings are more frequent than glass. also shown network flexible one, probably explaining...

The pressure-temperature diagram of hydrogen-aluminum system was determined for a pressure range 0–10GPa and temperature 27–800°C by in situ x-ray diffraction measurements. Pristine aluminum hydrogenated to trihydride at 8.9GPa 600°C. cyclic formation decomposition the hydride resulted lowering hydrogenation conditions down 4.9GPa 330°C. Transparent single crystals were recovered ambient conditions.

Abstract Strong opioids are used for chronic pain conditions, often long‐term, to improve the overall quality of life. Psychological approaches, such as acceptance and commitment therapy (ACT), effective in preventing long‐term opioid use. However, studies exploring their efficacy among patients who have strong over an extended period lacking. We present a case concerning following spinal cord injury wherein ACT sessions were conducted patient with use opioids. The was Japanese man his 80s...

Abstract The tectonic evolution of the Northern Shimanto belt, central Shikoku, Japan, was examined based on petrological and geochronological studies in Oboke area, where mafic schists Kawaguchi Formation contain sodic amphibole (magnesioriebeckite). peak P–T conditions metamorphism are estimated as 4 – 4.5 kbar (15 17 km depth), 240 270 °C available phase equilibria compositions. These metamorphic transitional between blueschist, greenschist pumpellyite–actinolite facies. Phengite K Ar...

In 3D computer graphics, mesh parameterization is a key technique for digital geometry processings(DGP) such as morphing, shape blending, texture transfer, re-meshing and so on. This paper proposes novel approach parameterizing into another one directly. The main idea of our method to combine competitive learning leastsquare techniques. It enough give some semantic feature correspondences between target meshes, even if they are in different shapes or poses. We show the effectiveness by...

The infrared absorption spectra of ${\mathrm{H}}_{2}\mathrm{O}$ and ${\mathrm{D}}_{2}\mathrm{O}$ ices were measured with a diamond-anvil cell up to 141 GPa at 298 K. high-pressure corrected for diamond provided the substantial profile over whole pressure range measured. A sequence pressure-induced Fermi resonance was observed between softening stretch mode combinations rotational bending modes below 55 as reported previously. One showed an abrupt increase in peak frequency...

Infrared spectra at high pressure and room temperature reveal that molecular dissociation metallization occur in solid ${\mathrm{H}}_{2}\mathrm{S}$ near 46 96 GPa, respectively. The disappearance of SH stretching bands the $2300--2500{\mathrm{cm}}^{\ensuremath{-}1}$ region simultaneous appearance a lattice vibrational mode around $1300{\mathrm{cm}}^{\ensuremath{-}1}$ signal dissociation. At higher pressures, low-energy electronic absorption band develops eventually extends throughout...

Fermi resonance was observed between the OH stretch and overtone of bending modes HDO molecules contaminated in phase VII D(2)O ice over pressure range from 17 to 30 gigapascals. An anharmonic coupling constant, which is related potential energy surface on hydrogen-bonded protons oscillate, found around 50 wave numbers through resonant range. Its experimentally obtained magnitude pressure-insensitive behavior will be useful for theoretical studies hence nature hydrogen bonding ice.