Materials Literature
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A brief review of the structural and electronic properties of Fibonacci, Thue-Morse, and random superlattices (SLs) is given. Quasiperiodic Fibonacci SLs and 1-D analogs of quasicrystals; their wave behavior is characterized by critical hierarchy of gaps. The interest in random SLs focuses on the problem of Anderson l…
The synthesis of the µ-carbido species of formula (pcFe)2C (pc = phthalocyaninato dianion) has been accomplished by reaction of pcFe with Cl4, while reaction of (pcFe)2C with 1-methylimidazole produces an adduct of formula [(1-Meim)pcFe]2C; on the basis of i.r. and visible spectra and single crystal X-ray data, both s…
The crystallization process of noncrystalline indomethacin (IMC) obtained by the grinding and by the fusion method was analyzed by a kinetic method. The noncrystalline samples of IMC were the α form ground for 10 h at 4°C (GNCγ), the γ form ground for 10h at 4°C (GNCγ) and the fused solid (NC). Ten kinetic models were…
A finite-element-method (FEM) time-periodic magnetic-field calculation is described. An AC calculation involving saturation characteristics requires many iterations and much storage space. The combination of FEM and the harmonic balance method enables the harmonic magnetic flux distribution under AC magnetization to b…
Sensitivity of API-5L X42 and X70 line-pipe steels to hydrogen degradation of fracture properties has been studied under a variety of loading conditions. Hydrogen-enhanced crack growth under fatigue and static loading was evaluated in numerous hydrogen-rich gas mixtures. Under cyclic loading, hydrogen accelerated fati…
The performance of classical transformer models under nonsinusoidal excitation is investigated and two novel models for such analysis, both of which account for the transformer core magnetic nonlinearities, are presented. All analytical results are compared with experimental data. >
The photoluminescence spectrum of MgO degassed at high temperature has been reinvestigated using a standard JRC-MgO sample because the contribution of low-coordination surface sites (Mg2+LC—O2–LC) to the observed photoluminescence of the degassed MgO samples has been recently questioned. The JRC-MgO-I sample exhibits…
A method for analyzing 3-D magnetic fields and currents in electrical machines excited from voltage sources has been developed. It was obtained by expanding the 2-D finite-element method into three dimensions, using the A phi method. The basic idea and the finite-element formulation are described. The effectiveness of…
Rate constants have been measured for the removal of OH(v= 0), OD(v= 0), OH(v= 1) and OD(v= 1) in collisions with CO. At room temperature (298 ± 4 K) and in 18 or 25 Torr argon, the values obtained were (k/10–13 cm3 molecule–1 s–1)= 1.53 ± 0.15, 0.55 ± 0.1, 10 ± 2 and 9.5 ± 2, respectively. Our results for OH(v= 0) an…
Description Papers cover all aspects of preventing of controlling hydrogen embrittlement, including the making of alloys, part fabrication, finishing, in-service performance testing, and testing actual hardware for quality assurance. This book focuses on the use and interpretation of standardized tests relative to hyd…
A model for small-scale single droplet fuel/coolant interactions (FCIs) is proposed, which considers the growth of a coolant vapor/liquid interfacial disturbance into a coolant liquid jet during the collapse of the vapor film surrounding the fuel. This results in the encapsulation of the jet as coolant drops beneath t…
Stator windings from three generators and one motor were subjected to a wide variety of diagnostic tests. Diagnostic tests included insulation resistance, polarization index, capacitance, dissipation factor tip-up, partial discharge magnitude, and discharge inception voltage. The destructive tests included breaking do…
A method allowing observation of calcium carbonate nucleation on the sheaths of cyanobacteria and other microorganisms is described. Nucleation of calcite was obtained on the sheaths of Lyngbya aestuarii and Scy‐tonema myochrous cultures but not on Entophysalis major and Pseudanabaena minuta. Differences in the rate o…
Cation-deficient nickel oxides have been investigated by X-ray photoelectron spectroscopy. The high-binding-energy features in the O(1s), Ni(2p) X.p.s. of defective NiO are described as multielectron final states, induced by defective sites. These sites are described as (NiO6)9– molecular clusters because of the d hol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToroidal microstructures from water-in-oil emulsionsJoel M. WilliamsCite this: Langmuir 1988, 4, 1, 44–49Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January 1988https://doi.org/10.1021/la00079a007RIGHTS & PERMISSI…
The performance of multilayers at the X-UV wavelengths depends upon the structural and geometrical imperfections of the deposited materials. These two respective contributions are not easily separated when only one Bragg peak is recorded, as is usually the case in the X-UV range, so a prediction of the performance at…
The development of microwave ferrite materials and devices over the last thirty years is traced. The status of materials, devices, and theoretical understanding prevalent in the mid-1950s is first reviewed. Developments in materials engineering of garnets and lithium ferrites in the 1960s and 1970s are described, alon…
The magnetizing inrush current which occurs at the time of energization of a transformer is due to temporary overfluxing in the transformer core. Its magnitude mainly depends on switching parameters. A system for measuring the inrush current is described. The system is also capable of presetting various combinations o…
Diatom species were classified as environmental indicators based on the species groups of benthic diatoms presented by KOSUGI (1987) and on planktonic diatoms from Tokyo Bay and Uraga Channel. All data on diatom ecology were obtained from living cells discriminated by the staining method (KOSUGI, 1985).The species gro…
The measurement of surface charging on a spacer in a +or-500-kV HVDC gas-insulated switchgear (GIS) is performed by a capacitive probe set inside the gas tank. The various factors that cause measurement errors are examined using a simple model. An analytical method to correct the measurement errors and transform the p…