Materials Literature
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An elastic viscoplastic constitutive equation for steels at high temperature is calibrated on a set of torsion tests performed by IRSID for different temperatures, strain rates and steel qualities. The integration of this equation in a computer code is examined and results for strip hot‐rolling are given.
Data on corrosion of metals are normally derived from two sources, namely, immersion/exposure tests and controlled electrochemical experiments. Because of inherent problems associated with the extrapolation of short-term measurements to long-term performance, many field workers are skeptical of the value of electroche…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeuterium NMR spectroscopic studies of low-valent iron porphyrin speciesDavid L. Hickman, Ataollah Shirazi, and Harold M. GoffCite this: Inorg. Chem. 1985, 24, 4, 563–566Publication Date (Print):February 1, 1985Publication History Published online1 May 2002Published inissue…
The use of monoclinic ZrO 2 as an additive improves the mechanical properties of TiB 2 ‐based composites without the use of stabilizers. In particular, TiB 2 ‐30% ZrO 2 compacts exhibited a transverse rupture strength of 800 MN/m 2 , few pores, and a K I c of 5 MPa·m 1/2 . The high strength and toughness are thought t…
Fundamental characteristics of a photoelectrochemical cell using p‐type porous‐Si layer (PSL) as a semiconductor photoelectrode were measured. The PSL electrode exhibited stable photodiode characteristics. The increase in the PSL thickness was very useful in suppressing the dark current, although it resulted somewhat…
Critical-point drying and freeze drying were compared both quantitatively and qualitatively as preparative procedures for scanning electron microscopy. Isolated hepatocytes were used as model cells. Nomarski differential interference contrast microscopy was used for light microscopic measurements of the hepatocytes in…
We examined the colloid materials in two Spodosols (Tihoi and Mangorewa) and two Andepts (Taupo and Oturoa) formed from the same volanic ash beds, using a combination of chemical and instrumental techniques. The dominant colloid material in all horizons of the Vitrandepts was allophane, except for the A horizon of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStoichiometry and kinetics of base-promoted disproportionation with concomitant ligand oxidation of tetracyano(1,2-diamine)ferrate(III)Masafumi Goto, Michihiro Takeshita, Noriyuki Kanda, Tomoya Sakai, and Virgil L. GoedkenCite this: Inorg. Chem. 1985, 24, 4, 582–587Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical reduction and reoxidation accompanied by reversible geometric isomerization. Electrochemistry of bis(dicarbonyl-.mu.-di-tert-butylphosphidorhodium). Isolation and x-ray crystal structure of bis(tetra-n-butylammonium) bis(dicarbonyl-.mu.-di-tert-butylphosphido…
Since its first appearance in 1954, polypropylene (PP) has become one of the most important commodity polymers. Among the outstanding properties of polypropylene are: low density, high melting point (167°C), high tensile strength, great rigidity, better stress crack resistance than high density polyethylene, and high…
Closed formulas are given for the calculation of the orientation matrix and the angles for a given reflection in a `z-axis' diffractometer geometry. These equations are derived for the conditions where the angle of incidence of the primary beam to the surface of the crystal is specified. Comparison is made with the st…
Crystalline silver( III ) oxide , which is stable over prolonged periods at −20°C, was obtained by anodic oxidation of AgClO 4 , AgBF 4 or AgPF 6 (not AgNO 3 ) in aqueous solution. The oxide of definite composition Ag 2 O 3 was hitherto unknown. It arouses interest as a possible component of the anodes in zinc/silver…
The reaction of zinc octaethylporphyrin with N 2 O 4 in dichloromethane gives, in a stepwise reaction, the zinc complexes of mono-, di-, tri-, and tetra-nitrooctaethylporphyrins. Demetallation, under acidic conditions, gives the corresponding free base porphyrins. The meso-nitro groups exert both steric and electronic…
The corrosion processes occurring in archaeological iron artifacts are discussed in the light of published measurements of electrode potentials and pH, and the relevance of this to the selection of conservation procedures is considered. In particular it is concluded that wet anaerobicstorage of ironwork should be succ…
<div class="htmlview paragraph">In die cast applications, high purity AZ91 alloy has been shown to result in parts with salt water corrosion performance that is 10 to 100 times better than the standard purity alloy. Two major concerns with regard to the continued development of the alloy have been resolved in th…
Abstract The instability of palygorskite and sepiolite under soil conditions was investigated to determine if these fibrous minerals transform directly to smectite under laboratory conditions. The treatment of 100 mg (0.12 mmole) of palygorskite with 1 mmole of NaOH solution (17 ml) at 150°C for 24 hr yielded a smecti…
Pseudomonas fluorescens PHK uses 4,5-dihydroxyphthalate as the sole carbon source for o-phthalate catabolism. This intermediate is the substrate for a decarboxylase of the pathway yielding protocatechuate. The decarboxylase was purified to homogeneity by an affinity chromatography procedure in which the reaction produ…
Partition ratios of zinc and lead between synthetic granitic melts and aqueous phase were determined at 800 degrees C and under P (sub H 2 O) = 3.5 + or - 0.25 kb. Two starting glasses in the system SiO 2 -Al 2 O 3 -CaO-Na 2 O were prepared. Their bulk chemical compositions are similar, i.e., SiO 2 content of 75.65 pe…
Tenside anion “doped”, highly conducting polypyrroles (PPY) have been grown electrochemical-ly from aqueous electrolytes. The influence of the electrolysis parameters on the conductivity have been investigated. The X-ray diffraction patterns allow to derive a structural model.
The effect of fluorine substitution into a mesogenic system depends critically on the manner in which it is introduced. The relative stabilities of smectic and nematic phases may be inverted by altering the site of substitution, and lateral fluorination is particularly interesting for the strong suppression of smectic…