Spectroscopic investigation of phase transitions IN CsLiMoO4crystals
Raman and NMR spectra in cubic and two distorted phases of CsLiMoO4 have been studied. Phase transitions in the crystal are shown to belong to order-disorder type.
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Structure of the Cells, Cell Division and Colony Formation in the Diatoms Isthmia enervis Ehr. and I. nervosa Kütz
The two common species of Isthmia have been studied mainly by scanning electron microscopy. The occurrence of differing cell shape in the same species is an extremely unusual feature amongst diatoms. This is coupled with heteropolar valves. The formation of colonies and the peculiar attachment of cells to one another…
Inhibition of Hot Corrosion by MgSO4 and BaSO4 and its potential dependence
Abstract Electrochemical corrosion measurements have been performed with IN 100 in a (mole %) 90 Na 2 SO 4 10 K 2 SO 4 melt with different additions of MgSO 4 and BaSO 4 at 1173 K in order to investigate the inhibition effect of these compounds and its potential dependence. Potentiostatically controlled measurements…
Microphase separation in urethane elastomers as seen through NMR measurements
Urethane elastomers were prepared from poly(ethylene adipate) glycol or poly(tetramethyleneoxide) glycol, 4,4′-diphenylmethane diisocyanate, 1,4-butanediol, or 3,3′-dichloro-4,4′-diaminodiphenylmethane, or ethylenediamine as chain extenders. The glass transition of the polymers was determined from thermomechanical mea…
Heat capacity and N. M. R. study of the NH4MgF3perovskite
The NH4MgF3 perovskite undergoes a structural and reorientational phase transition at Tc=107. 5±0. 1 K. The librational motion of the NH+ 4 ion below Tc is hindered by a barrier producing an activation energy of Ea/k = 850 K, and correlation time of c=50 fs, as found in N. M. R. measurements. Tunnelling in the ground…
The effect of metrizamide on regional brain glucose metabolism in the rat
The X-ray contrast material metrizamide is structurally related to 2-deoxyglucose and inhibits brain glucose phosphorylation in vitro. In vivo, the present autoradiographic study with labeled 2-deoxyglucose revealed a global reduction of brain glucose phosphorylation after metrizamide administration in the cisterna ma…
Resonance Raman spectra of the carbon-bridged iron porphyrin dimer, (.mu.-carbido)bis[(5,10,15,20-tetraphenylporphinato)iron]
ADVERTISEMENT RETURN TO ISSUEPREVArticleResonance Raman spectra of the carbon-bridged iron porphyrin dimer, (.mu.-carbido)bis[(5,10,15,20-tetraphenylporphinato)iron]Joseph A. Hofmann Jr. and David F. BocianCite this: Inorg. Chem. 1984, 23, 8, 1177–1180Publication Date (Print):April 1, 1984Publication History Published…
Development and Installation of 275KV SF6 Gas-Insulated Transmission Line
In order to install a commercial 275kV gas-insulated transmission line (called GIL by the authors) on a route with many bends and inclines, a temperature rise test and long-term field test were performed to confirm the current capacity and thermo- mechanical and dielectric characteristics. Fault location and leakage g…
Molten Fuel/Coolant Interactions: Recent Analysis of Experiments
If a complete failure of normal and emergency coolant flows occurs in a light water reactor, fission product decay would eventually cause melting of the reactor fuel, leading to contact with water. An energetic fuel/coolant interaction (steam explosion) may result. Experiments were performed at Sandia National Laborat…
Sorption of Perchloroethylene and Toluene by Wool and Other Textiles: Influence of Co-solvents
Perchloroethylene and toluene are sorbed by dry wool very slowly at room tem perature. Even at the boil several hours of treatment are required to introduce 2% by weight of these solvents into wool. The rate of uptake of perchloroethylene and toluene by conditioned wool is approximately ten times greater, and treatmen…
Electron Paramagnetic Resonance of Tetravalent Praseodymium in Zircon
Abstract The electron paramagnetic resonance of Pr 4+ in the tetragonal crystal field of ZrSiO 4 is measured at 9.9 GHz at temperatures near to 15 K. Hyperfine constants and g ‐values are reported which, unlike most other rare‐earth ions in this material, show only weak anisotropy. The spectra are interpreted in terms…
Reflectance ellipsometry studies of the ternary chalcohalides SbSI, SbSeI and BiSI near room temperature
The technique of optical reflectance ellipsometry has been used to measure room temperature polarizabilities of three ternary chalcohalides: SbSI, SbSeI and BiSI. This method is shown to be very sensitive to small changes of the differential polarizability, defined herein as r = |(α∥-α⊥)/(α∥ + α⊥)|, where α∥ and α⊥ ar…
Investigation of ferroelectric phase transitions in CsLiMoO4type crystals
X-ray and calorimetric investigations of successive phase transitions (PT's) in crystals of CsLiMoO4 type were made. The theoretical model description of these PT's as of order-disorder type ones is suggested and thermodynamical properties of the model are discussed.
Titanium Alloys for High Temperature Applications — A Review
The development of energy efficient gas turbine engines with high thrust-to-weight ratios has increased the need for more titanium static and rotating engine components because of the high property-to-density ratio of these alloys. In the last 20 years advances in alloy development and microstructure control have made…
Effect of Ambient Temperature on the Performance of Contaminated DC Insulators
Effect of ambient temperature simulating different weather conditions has been investigated on insulators of different shapes. It has been observed that for a given salinity of contaminating solution, the amount of salt contained in the contaminated-surface layer is strongly temperature dependent. This is attributed t…
Ferroelectric-superionic conductor phase transitions in Na3Sc2(PO4)3and ITS isomorphes
The changes in structure and dielectric properties of some phosphates of the family NanM2(XO4)3 with the change of their temperature strongly suggest the existence of new kind of phase transitions: ferroelectric-superionic conductor and antiferroelectric-superionic conductor.
Forming and Sintering Behavior of B‐ and C‐Doped α and β‐SiC
The effects of forming pressure and sintering temperature on shrinkuge, density, and phase composition of α‐ and β‐SiC were determined. Alpha SiC developed the 4H phase at the expense of the 6H phase at >2150°C. The beta form converted to the 6H phuse at >2000°C, with intermediate development of the 15R and 4H p…
On the Pattern of Water Penetration into a Hot Particle Bed
An experimental study of water penetration into a hot particle bed has been conducted. The pattern of water penetration was found to be complicated due to the formation of dry pockets and channels. Overall, the water penetrates down the bed as a single column in the central region, while the annular region near the wa…
Leaching of Glasses with Molar Composition 20Na 2 O · 10RO · x Al 2 O 3 · (70‐x)SiO 2
Sodium depth profiles were determined in water‐leached glass samples with molar composition 20Na 2 O · 10RO · x Al 2 O 3 · (70 ‐ x)SiO 2 (RO = CaO, MgO, and ZnO) using secondary ion mass spectrometry. The leaching of sodium ions decreases with increasing Al 2 O 3 content in all three glass systems. For x = 0 the leach…
Graft copolymerization of styrene, methylmethacrylate, and acrylonitrile onto jute fibres
Abstract The contribution of jute constituents, namely, water soluble matters, waxes, pectins, lignin, hemicelluloses, and α‐cellulose in the graft copolymerization reaction of jute fabric with some vinyl monomers was investigated. Styrene, methylmethacrylate, and acrylonitrile were used as the monomers and Fe 2+ /H 2…