Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract The compressive creep behavior of rigid unreinforced and particulate reinforced polyurethane foams at different densities, filler contents, temperatures, and loads was investigated. The creep behavior could be described by a power function of time and its temperature dependence by an Arrhenius type relation.…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation R. Falabella, R. J. Farris, S. L. Cooper; Constitutive Equations for Orientation in Polyurethane…
T1H3(SeO3)2 crystal has been grown for the first time, and Some of its properties have been measured in the range of 10–293K. Two phase transitions have been found: T αβ = Tβα =56.4K and Tβγ= 51.6K (Tγβ =52.9K). Crystal structure of α -phase has been determined (P 212121, z = 4). A conclusion is made that γ-phase is s…
Earlier research on the development of durable polymeric sizing agents for room temperature application to cotton yarns has been expanded to full warp slashing and weaving evaluation. Weaving of yarns treated with high concentra tions of a low-temperature-cure polyacrylate, with a glass transition temperature of 0°C,…
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.
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…
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…
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…
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 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…
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…
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…
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…
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…
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…
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…
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.
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 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…
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.