Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew route to unsymmetrical phthalocyanine analogs by the use of structurally distorted subphthalocyaninesNagao Kobayashi, Ryoko Kondo, Shinichiro Nakajima, and Tetsuo OsaCite this: J. Am. Chem. Soc. 1990, 112, 26, 9640–9641Publication Date (Print):December 1, 1990Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR and crystallographic studies of a p-sulfonatocalix[4]arene-guest complexSeiji Shinkai, Koji Araki, Tsutomu Matsuda, Nobuaki Nishiyama, Hirotaka Ikeda, Isao Takasu, and Masakazu IwamotoCite this: J. Am. Chem. Soc. 1990, 112, 25, 9053–9058Publication Date (Print):December…
It must be measured the height that is obtained in the peaks indicated in the diffractograms of the compounds: CaO, SÍO2, β-C2S γ-C2S, C3A, C2F and C4AF, with the finality of study their mutual influences, and also study the aluminoferrites over such bicalcic silicates, obtained from differents raw mix. The adquired k…
Two factors have determined the actual deterioration state of the Cathedral of Cádiz, one is natural and the other is anthropogenic. On one hand, the presence of salts conditioned by atmospherical environment and saline solutions of the rising damp; on the other hand, the vicissitudes suffered by the temple during its…
The hidric behaviour of two slaty rocks from the NW of Spain (phyllite of Rande —La Coruña— and slate of Luarca —Asturias—) used as ornamental and roof slate is studied. An experimental methodology for proper interpretation of the hidric phenomena to which they can be subjected due to their particular use in the build…
This paper attempts to describe the recently approved UNE standards through a systematic analysis of the main specifications therein contained and the values considered for each of them, as well as the drafts for ISO and EN concrete block standards. Furthermore, the study tries to place the set of ISO standards in the…
It is argued that powders have so many particles per unit volume that they can be treated in a manner similar to conventional liquids. They have an entropy S(V,N), but as energy is not important the place of temperature delta E/ delta S is taken by delta V/ delta S. Equations capable of giving plug flow are derived. I…
The presence of methanogens Methanobacterium arboriphilus, Methanobacterium bryantii, or Methanobrevibacter smithii increased the level of cellulose fermentation by 5 to 10% in cultures of several genera of anaerobic fungi. When Neocallimastix sp. strain L2 was grown in coculture with methanogens the rate of cellulose…
Pitting of single crystals of Al and homogenized Al‐Cu alloys has been studied on low index surfaces as a function of surface orientation and alloy content in . The potentials at which pitting phenomena occurred were determined potentiodynamically using single‐cycle pitting tests at a scan rate of 0.5 mV/s. Galvanosta…
Polystyrene and poly(ethylene terephthalate) substrates were modified by radiofrequency plasma deposition with organic vapors comprised of carbon, oxygen, and hydrogen (acetone, methanol, glutaraldehyde, formic acid, allyl alcohol, and ethylene oxide). The treatments resulted in the deposition of a film at least 100 A…
Atomistic scale computer simulations can provide a more detailed understanding of the structure of glasses. Our results on sodium silicate glasses show that sodium ions are associated with nonbridging oxygens and that the sodium ions and nonbridging oxygens tend to aggregate to form silica rich regions and alkali rich…
Measurements on anodic surface oxidation of noble metals as a function of time and electrode potential show that the initial extension and subsequent thickening of such oxide films is directly logarithmic in time. A striking feature of this behavior is that the direct logarithmic extension law already applies to incre…
The present paper states very briefly the main steps leading to the technique of scanning electron microscopy (SEM) of vascular corrosion casts. From the terms presently used (injection method, microcorrosion cast, injection replica, vascular corrosion cast, vascular cast) the use of "vascular corrosion cast" for lymp…
In science we like to emphasize the novelty and originality of our ideas. This is harmless enough, provided it does not blind us to the fact that concepts rarely arise out of nowhere. There is always a historical context, in which isolated precursors of the idea have already appeared. What we call “discovery” sometime…
An array-type universal profile function for powder-pattern fitting is described. It is defined as an array of unknown parameters representing the profile heights at discrete angular steps. The unknown parameters are determined during least-squares fitting together with the integrated intensity, the peak position, the…
Far-infrared reflection spectra of a polycrystalline sample of monoclinic CuO were measured in the frequency range from 30 to 700 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ at temperatures between 10 and 300 K. The six observed lattice vibrational modes at 147, 161, 321, 478, 533, and 587 ${\mathrm{cm}}^{\mathrm{\ensu…
This extensive materials selection and application book is the first of its kind. It describes a comprehensive treatment of all forms of high temperature corrosion problems encountered in industry, especially gas turbine and aerospace, heat treating, mineral and metallurgical processing, ceramic, electronic and glass…
A theoretical model of fatigue in ferroelectric thin-film memories based upon impact ionization (e.g., Ti+4 to Ti+3 conversion in PbZr1−xTixO3), resulting in dendritic growth of oxygen-deficient filaments, is presented. The predictions of spontaneous polarization versus switching cycles Ps(N) are compared with both Mo…