Materials Literature
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The phase transition in metastable phases of vanadium dioxide, from VO2(B) to VO2(A), has been investigated. The transition to VO2(A) was induced mechanochemically by compressing or grinding VO2(B) powders and subsequent heat treatment. In non-stressed samples, the transition proceeded slowly with prolonged heat treat…
A comparison is made on the dielectric properties of the ferroelectric perovskite bismuth titanate for both crystalline (along different directions) and polycrystalline (with and without flux) samples, using the complex ac impedance technique. Results for the impedance, conductivity activation energies, bulk dielectri…
Wicking flow of water is examined in composite networks of cellulose and carboxymethyl cellulose (CMC) fibers. The rate of advance of water through paper strips and fluff pads of varying composition is reported, while dynamic electrotensiometry is used to measure the wetting and swelling characteristics of the individ…
Theoretical and experimental analyses are presented of the electromagnetic transient following the out-of-phase synchronization of a three-phase five-limb step-up transformer; this means an abnormal condition where the angle between phasors representing the generated voltages and those representing the power network v…
This paper will summarize the strengthening and toughening behaviors of α+β and β alloys at room temperature. In addition, some considerations on the strengthening capacity and some relationships between microstructures and mechanical properties will be presented.The strength of α+β alloys can be improved by increasin…
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Copper and silver test specimens were subjected to indoor exposure tests carried out at 23 sites in Tokyo, Bandung, Singapore, and Bangkok. At the same time, the deposition rates of , , , , and particles which had deposited on the sampling devices were measured. Corroded specimen surfaces were examined by electron pro…
The thermal decomposition of cobalt acetate tetrahydrate has been studied using time-resolved powder neutron diffraction. By using selectively deuterated samples, the loss of water or the breakdown of the acetate group can be identified by following the decrease in the incoherent background of the diffraction pattern…
Some ferrospinels act as catalysts for the decomposition of H 2 O 2 , their effectiveness is dependent on the composition of the catalyst. This study is to find the most effective catalyst of stoichiometry M II Fe 2 III O 4 . A set of ferrites of different composition M II Fe 2 II 0 4 (M II = Mn, Co, Ni, Cu, Zn, Cd) w…
A new high-temperature solid phase of tetramethylammonium thiocyanate has been found above the phase transition at 455 K, where a large entropy change (15 J K–1 mol–1) was observed. X-ray powder patterns recorded at ca. 470 K showed that this phase forms a CsCl-type cubic lattice with aO= 600 pm, indicating that the S…
The accurate measurement of the losses of a 5.5 kW induction motor using a calorimetric method is described. Operating the calorimeter in a balance or ‘null’ mode, the losses can be reliably measured to worst case accuracies of 1.45% on full load. Examples of measured losses are given.
The bondings in two limiting types of spherical gold clusters are considered in this paper. Close-packed spherical gold clusters form molecular orbitals that can be analyzed by using the jellium model. Closed shells correspond to the Tilling of the following wave functions: 1s, 1p, 1d, 2s, 1f, 2p, 1g, etc., which have…
Abstract Raman spectra were obtained from PtO, Pt 5 O 6 , Pt 3 O 4 , α‐PtO 2 , β‐PtO 2 , M x Na y Pt 3 O 4 (M = Co, Ni), PtCoO 2 and MPt 3 O 6 (M = Mn, Co, Cd). An enumeration of the allowed Raman modes is made for all of these oxides except Pt 5 O 6 , for which the structure is unknown. Polarization measurements allo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhoto-cross-linking reaction of benzophenone-containing polyimide and its model compoundsHiroyuki Higuchi, Takashi Yamashita, Kazuyuki Horie, and Itaru MitaCite this: Chem. Mater. 1991, 3, 1, 188–194Publication Date (Print):January 1, 1991Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalysis with palladium deposited on rare earth oxides: influence of the support on reforming and syngas activity and selectivityF. Le Normand, J. Barrault, R. Breault, L. Hilaire, and A. KiennemannCite this: J. Phys. Chem. 1991, 95, 1, 257–269Publication Date (Print):Janua…
A range of garnet structured compositions can be synthesized between the end members C 3 AH 6 (hydrogarnet) and C 3 AS 3 (grossularite) at different temperatures and pressures. The extent of this series at 95°C and a pressure of one bar has been investigated. The synthesis of a range of garnets from C 3 AH 6 to C 3 AS…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyphosphazenes with glucosyl and methylamino, trifluoroethoxy, phenoxy, or (methoxyethoxy)ethoxy side groupsHarry R. Allcock and Shawn R. PucherCite this: Macromolecules 1991, 24, 1, 23–34Publication Date (Print):January 1, 1991Publication History Published online1 May 200…
The optics of simple lenses. The motion of charged particles in an electrostatic field. The determination of the axial potential. The optics of simple lens systems. Aberrations. The LENSYS program. Technical aspects of LENSYS. References.
The AC electric breakdown field strength F/sub B/ of aromatic polymer films as a function of sample thickness was investigated. A power-law dependence of F/sub B/ on sample thickness was found. The exponential parameter of the power law was shown to correlate with the electron accepting properties of the polymer. Reas…
An optoelectronic system for detecting partial discharges in a sheltered HV device is described. The system consists of a fluorescent plastic optical fiber, with photomultipliers or photodiodes measuring the light intensity at the end of the fiber. The result depends on various factors that might influence the optical…