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。
The deformation of liquid crystalline blue phases BPI and BPII under the influence of a weak electric field is studied for systems with negative dielectric anisotropy. For the initially cubic structures of these materials, the interplanar spacings in the field direction were found to increase or to decrease in the fie…
The benzoid amine, quinoid imine, and protonated nitrogen structures in polyaniline can be quantitatively differentiated in the properly deconvoluted N 1s X-ray photoelectron spectroscopy (X.P.S.) core-level spectrum.
A series of Cu-Ni alloys, containing 30–90%Cu, has been studied in natural sea water using electrochemical methods, free corrosion tests, and X-ray diffraction. With the alloys containing 90 and 70%Cu simultaneous dissolution of both components with copper redeposition was observed. With those containing 50 and 30% Cu…
Abstract
This literature review is intended to give some general guidelines on corrosion testing of metals and alloys for marine applications, in particular with regard to the choice of the test environment. The general chemical properties of sea water are discussed and compared with those of coastal and/or polluted sea water,…
The use of design criteria for assessing the stresses to which composite dielectric structures are subjected implies careful and informed application. The convention required in the application of these criteria is examined in the light of the physical processes expected in an oil/cellulose transformer structure and r…
High densities of inert gas bubbles can be produced in metals by ion implantation or nuclear transmutations. At low temperatures, these bubbles grow by repeated emission of prismatic dislocation loops. An analysis is presented for loop punching considering the effects of the stress fields between bubbles and the prese…
Sponge zirconium and Zr-2.5 wt% Nb, Zircaloy, or Excel alloys all exhibit accelerated irradiation growth compared with high-purity crystal-bar zirconium for irradiation temperatures between 550 to 710 K and fluences between 0.1 to 10 × 1025 n ∙ m-2 (E > 1 MeV). There is generally an incubation period or fluence…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-phase oxidation of 2-propanol to acetone by dioxygen using supported platinum catalystsJames W. Nicoletti and George M. WhitesidesCite this: J. Phys. Chem. 1989, 93, 2, 759–767Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Publis…
Four novel µ-phenolato copper(II) binuclear complexes with exogenous bridges were synthesized, namely [Cu2L3(X)][CLO4]2, X = N3(1) or OCN (2) and [Cu2L4(X)][ClO4]2·H2O, X = C2H5O (3) or N3(4), L3 is the binucleating ligand 4-methyl-2,6-bis[N-(2-pyridylethyl)formimidoyl]phenolate and L4= 4-methyl-2,6-bis[N-(2-methylthi…
The paper introduces a general criterion for leader inception of phase-to-ground air insulation under positive critical switching impulses. The new leader inception criterion establishes the correspondence between continuous leader initiation in the vicinity of the highly stressed electrode and conditions prevailing l…
Thermodynamic, structural and dynamical properties of a new type of discotic compounds, a hydrocarbon without any heteroatoms, displaying a nematic discotic phase have been investigated by means of X-ray diffraction, electro-optical relaxation, and calorimetric studies. Of particular interest are the strength of the f…
Abstract
The reaction of Fe(CIO4)2·6H2O with N,N′,N,″-trimethyl-1,4,7-triazacyclononane (L) in methanol affords, in the presence of a small amount of oxygen, the deep blue binuclear complex [L2Fe2(µ-OH)3](CIO4)2·2MeOH·2H2O which was characterized by EXAFS, e.s.r., u.v.-visible and Mössbauer spectroscopy to be a mixed valence i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the thermal decomposition of methoxybenzene (anisole)J. C. Mackie, K. R. Doolan, and P. F. NelsonCite this: J. Phys. Chem. 1989, 93, 2, 664–670Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1 January 1989ht…
Rodrigues vectors are explored as a means of representing crystal orientation distributions. Relationships between the Rodrigues vectors and several more commonly utilized representations of rotations are presented. The restrictions which cubic material symmetry imposes on the Rodrigues space are examined and relation…
The nucleation of microcellular foams in amorphous thermoplastics has been performed by supersaturation with gas at an elevated temperature. Pressure and temperature are then carefully reduced in the vicinity of the glass transition temperature of the material. The result is a foam structure with cells on the order of…
Abstract Charging of the specimen under electron beam irradiation is a common problem in scanning electron microscopy (SEM). It results in unstable imaging conditions and a loss in resolution due to defocus of the beam. In addition, it can cause permanent changes in some specimens from translocation of mobile ions und…
Tilings and Patterns: An Introduction presents in convenient paperback form the first half of Tilings and Patterns. Omitting the more specialized material of the earlier volume, this abbreviated edition make's the authors' contributions to tiling theory and its practical applications accessible to a wide audience. Til…
The authors evaluate the available starting methods for motors above 3000 HP, focusing on technical and economic aspects. The following starting schemes are discussed: direct online, reactor, autotransformer, capacitor, captive transformer, and frequency start. A review of the network conditions that favor a particula…