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。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe 1- and 2-dimensional tungsten-183 and vanadium-51 NMR characterization of isopolymetalates and heteropolymetalatesPeter J. DomailleCite this: J. Am. Chem. Soc. 1984, 106, 25, 7677–7687Publication Date (Print):December 1, 1984Publication History Published online1 May 2002…
The green primary compound of chloroperoxidase was prepared by freeze-quenching the enzyme after rapid mixing with a 5-fold excess of peracetic acid. The electron paramagnetic resonance (EPR) spectra of these preparations consisted of at least three distinct signals that could be assigned to native enzyme, a free radi…
The growth rate and final size of developing organs is controlled by organ-intrinsic mechanisms as well as by hormones and growth factors that originate outside the target organ. Recent work on Drosophila imagined discs and other regenerating systems has led to the conclusion that the intrinsic growth-control mechanis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular order in condensed states of semiflexible poly(amic acid) and polyimideNobuyuki Takahashi, Do Y. Yoon, and William ParrishCite this: Macromolecules 1984, 17, 12, 2583–2588Publication Date (Print):December 1, 1984Publication History Published online1 May 2002Publish…
We report the first observation of the modulation doping effect in Si/Ge0.2Si0.8 heterojunctions grown by molecular beam epitaxy. Peak hole mobilities of ∼3300 cm2 V−1 s−1 have been observed at 4.2 K. These values, although nonoptimum, are comparable to the best reported values for holes in Si/SiO2 inversion layers. L…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReentrant phase transition in acrylamide-derivative copolymer gelsSeiji Katayama, Yoshitsugu Hirokawa, and Toyoichi TanakaCite this: Macromolecules 1984, 17, 12, 2641–2643Publication Date (Print):December 1, 1984Publication History Published online1 May 2002Published inissue…
The development of hot‐pressed Sic‐whisker‐reinforced alumina has resulted in composites with fracture toughness values ∼;8.7 MPa·m 112 at 20 vol% SiC. Whisker orientation during processing leads to anisotropy in both fracture toughness and fracture strength. Fracture strengths are also limited by the ability to dispe…
The aim of this work is the study of the U.V. radiations effects on plasticized Poly (vinyl chloride) used as waterproofing membrane in Building and also in Public Works. The ageing fact due to U.V. radiations has been followed for 3.000 hours, checking the changes produced in the composition of the material, on its m…
This work, which follows on from previous ones, studies the development of the solid-stage quantity formed in ASTM D 1141-75 artificial sea-water, in which the series of samples of mortar (1:3), made up of a portland cement resistant to sulfate (cement 2 < > P 450-Y) and the mixtures: cement 2/slag = 85/15, 65/35, 40/…
This theoretical and experimental study on cement or lime and cement mortars brings up to date the contents of Chapter 3: MORTARS, of Norm MV 201-1972 "Resistant brick-work walls" which lost its validity when disappeared portland cement P-250, substituted by portland cement PA-350 with active additions, prescribed in…
In this article, the author has the purpose to give a general view of the applications of the automatic equipment of X ray diffraction purchased by the I.E.T.c.c., quoting the main software programs used by the team in its qualitative, quantitative and crystallographic analysis, as well as to give a simplified account…
Transmission zone plates composed of materials describable by the complex index of refraction n^[n^=(1-δ)+ik] modulate both the amplitude and the phase of the light passing through them. In this paper, a general variational approach to the design of zone-plate profiles that maximize system transfer functions, such as…
A previously unreported basic bismuth carbonate, (Bi0)4(0H)2C03, has been identified as an intermediate product in the interconversion of a-BiZ03 and synthetic bismutite, (BiO)?CO,, in aqueous carbonate solutions. It has a narrow stability field, between C 0 2 partial pressures of 10-55".0 Pa and IO-' .""' Pa, in the…
Even daylight effects the rearrangement of dihydroazulene 1 into 8-vinylheptafulvene 2; thermally, the reaction proceeds in the reverse direction. The behavior of 1 is largely determined by the residue R. The reaction cycle could find application in the storage of information.
A new approach is given for obtaining fast electro-optical response and good angular-viewing characteristics in a liquid-crystal variable-retardation device. The improved characteristics make the new device well suited for use in field-sequential color systems.
In heterogeneous materials such as concretes or rocks, failure occurs by progressive distributed damage during which the material exhibits strain‐softening, i.e., a gradual decline of stress at increasing strain. It is shown that strain‐softening which is stable within finite‐size regions and leads to a nonzero energy…
Neutron inelastic scattering experiments have been carried out to measure the phonon energies of deuterated naphthalene C 10 D 8 for the lowest 12 dispersion branches along ( xi 00) and (00 xi ) directions at various temperatures ranging from 6 to 300K. Using measured mode Gruneisen parameters the quasiharmonic shifts…
The form of the collision integral describing elastic scattering of electrons and phonons by crystal defects is discussed once again. It is shown that in the absence of detailed balance for the transition probability (Wkk' ≠ Wk'k), the collision integral does not contain Fermi or Bose factors (1nk) contrary to the poi…
The present review is devoted to an analysis of the relationship between the changes in the structure and reactivity of solids, brought about by the development of a deformation. It has been shown that the principal regular features of mechanochemical transformations are determined by the extent of the structural diso…