Materials Literature
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The defect center causing the 2 eV absorption band induced in pure silica core fibers by 60 Co γ-rays is discussed. The 2 eV band and non-bridging oxygen hole center (NBOHC, SI–O·) show almost the same thermal annealing characteristics. The peak wavelength of the 2 eV band in low-OH (≦6 ppm) fibers is 630 nm, but shif…
The ferroelectric first order phase transition at 367 K has been discovered in TMACA crystals, which is presumably related to a motion of trimethylammonium cations.
The fracture toughness of fine‐grained undoped ZrO 2 ‐toughened Al 2 O 3 (ZTA) was essentially unchanged by postsintering hot isostatic pressing and increased monotonically with ZrO 2 additions up to 25 wt%. The strength of ZTA with 5 to 15 wt% tetragonal ZrO 2 , which depended monotonically on the amount of ZrO 2 pre…
Die Elemente Silicium und Kohlenstoff können als Repräsentanten von Materie und Leben auf dieser Erde betrachtet werden: Silicium spielt die Schlüsselrolle bei der „Petrikation”︁ unbelebter Materie, während Kohlenstoff die Grundlage für die „Inkarnation”︁ lebender Organismen bildet. Die Titelverbindungen und ihre Deri…
Abstract A study was made of the extent to which the lateral surfaces contribute to the surface area of five kaolinites of different crystallinities. Methods used included the low-temperature adsorption of N 2 and Ar as measured by a volumetric technique coupled with microcalorimetry, the interpretation of the adsorpt…
A magnetic field suppresses turbulence and thermal convection in a Czochralski crystal puller. The amounts and distributions of dopants and oxygen in the crystal are determined by the motion of the molten silicon during crystal growth. This paper presents analytical solutions for the melt motion in a Czochralski pulle…
Mutual orientation effects on the rate of nonadiabatic electron transfer between several diporphyrin pairs of experimental \ninterest are examined. The electronic matrix element for electron transfer is calculated within a one-electron spheroidal \nmodel for a variety of states and orientations which are relev…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWet oxidation of poly(ethylene glycol) catalyzed by manganese-cerium composite oxideSeiichiro Imamura, Minoru Nakamura, Nariyoshi Kawabata, Junichi Yoshida, and Shingo IshidaCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 1, 34–37Publication Date (Print):March 1, 1986Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreferred orientation of imidazole ligands in metalloporphyrinsW. Robert. Scheidt and Daniel M. ChipmanCite this: J. Am. Chem. Soc. 1986, 108, 6, 1163–1167Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986https:…
Unlike the orthorhombic phase, the icosahedral phase of ${\mathrm{Al}}_{86}$${\mathrm{Mn}}_{14}$ exhibits a local magnetic moment. The effective moment of icosahedral-phase Al-Mn and Al-Si-Mn alloys increases with Mn concentration up to a maximum of (1.5\ifmmode\pm\else\textpm\fi{}0.5${\ensuremath{\mu}}_{B}$). The amo…
In a prospective, randomized, double-blind study, 49 patients underwent lumbar myelography using iotrol (24 patients) or metrizamide (25 patients). The diagnostic imaging adequacy of iotrol was comparable with that of metrizamide. After iotrol myelography, adverse reactions were fewer, less severe, and of shorter dura…
This paper presents experimental observations of the effects of dissolved oxygen, hydrogen peroxide, and water purity (primarily dilute sulfuric acid) on the intergranular stress corrosion cracking (IGSCC) of weld-sensitized AISI 304 stainless steel (SS). This study used a complex experimental system in which temperat…
Abstract Ferrierite has been found at Tapu, Coromandel Peninsula, New Zealand, as a mineral vein with calcite in altered hornblende andesite lava of the Miocene Beeson's Island Volcanics. The ferrierite is low in SiO 2 (63.67%) and high in Al 2 O 3 (13.75%), MgO (3.48%), and BaO(2.35%). The large a axis and cell volum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChange in radius of gyration of semicrystalline polymers upon crystallizationMarc L. MansfieldCite this: Macromolecules 1986, 19, 3, 851–854Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986https://doi.org/10.10…
Abstract Mathematical models of kinetically controlled random copolymerizations with intramolecular reactions have been developed for A 2 + B 2 and A 3 + B 2 type reactions, in which the B 2 monomer is long and flexible enough to have a Gaussian end‐to‐end distance. Concentrations of different molecular species are ca…
The Sludge-to-Oil Reactor System (STORS) continuously converted over 400 gallons (20% solids) of sewage sludge to oil during 100 hours of operation. About 80% of the energy in the sludge was recovered as an oil and char. The energy recovered was sufficient to make the STORS energy self-sufficient assuming the char is…
Using X-ray diffraction methods it has been ascertained that the intermediate phase in Sn2P2Se6 crystals existing in the range 193 K to 220 K and preceding the ferroelectric transition at 193 K is an incommensurate phase. Modulated structure is characterized by the wave vector q(T) = (-1.146 δ(T)a*, 0, δ(T)c*), where…
This paper describes the effect of silicon additions to an 18Cr-8Ni stainless steel (SS) on the resistance to pit initiation in halide media. Electrochemical polarization measurements conducted in aerated 3.5 wt% sodium chloride at 25 C indicate a progressive increase in the critical breakdown potential (Ec) for 18Cr-…
The different species formed when gaseous formaldehyde is dissolved in aqueous medium are investigated by a 13 C NMR flow-through technique and the spectra of commercial aqueous formaldehyde solutions containing methanol completely interpreted. 13 CH 2 O was used to study the crosslinking reaction with gelatin which…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal degradation of aromatic-aliphatic polyethers. 1. Direct pyrolysis-mass spectrometryG. Montaudo, C. Puglisi, E. Scamporrino, and D. VitaliniCite this: Macromolecules 1986, 19, 3, 870–882Publication Date (Print):March 1, 1986Publication History Published online1 May 20…