Materials Literature
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ABSTRACT Clay mineral transformations of 10 North Sea wells have been studied, and several transformation stages picked out and correlated with geothermal variations: smectite disappears at 149 to 167°F (65 to 75°C), whereas transformations in the mixed-layer illite-smectite clay minerals are observed between 113 and…
A pin-on-disk tribometer was used to study the coefficient of friction as a function of temperature for tricresylphosphate (TCP) on CVM M-50 tool steel under the following conditions: TCP was present in a liquid reservoir (bulk lubrication), and TCP was applied as a liquid layer directly to the disk (limited lubricati…
Precipitation of 6 phase in an Fe-25Cr-7Ni-3Mo alloy with α/γ duplex structure has been studied systematically and the following results were obtained:(1) TTP diagram for the a phase precipitation was a C-type with a nose at 820°C.(2) σ phase nucleated on the α/γ interfaces and grew into α grains as a eutectoid reacti…
Manufacture of ceramics microstructure of ceramics mechanisms of corrosion experimental methods resistance of ceramics thermodynamic calculations properties and applications of different types of ceramics choosing a ceramic for a corrosive environment.
Abstract Structural phase transitions in the LaMnO 3+λ system are studied at various temperatures and with different Mn 4+ ion concentrations. Two structural phase transitions are established. The O′‐orthorhombic – O‐orthorhombic transition (O′O transition) is due to removing the cooperative Jahn‐Teller distortions a…
Titanium and its alloys have been commercially available for over three decades. Its high strength-to-weight ratio plus its resistance to corrosion were recognized early and utilized by the aerospace and chemical industries, as well as by the medical profession. The benefits of corrosion resistance, biocompatibility,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer spectra of oxidized iron porphyrinsDaniel R. English, David N. Hendrickson, and Kenneth S. SuslickCite this: Inorg. Chem. 1983, 22, 2, 367–368Publication Date (Print):January 1, 1983Publication History Published online1 May 2002Published inissue 1 January 1983http…
The silica in some biominerals has been investigated by electron microscopy and i.r. and n.m.r. spectroscopy and has been shown to be amorphous and to contain many Si–OH units.
Abstract A new single‐crystal scintillator intended for applications in a scanning electron microscope (SEM) is presented. It is a single‐crystal disc of yttrium aluminium perovskite activated by trivalent cerium free of traces of Fe ions. The single crystals of YAlO 3 : Ce 3+ (YAP: Ce 3+ ) were prepared by the Czochr…
Abstract The consistency of fats can be measured with the cone penetrometer (AOCS Method Cc 16‐60). Several suggestions have been made to convert readings of penetration depth into parameters such as yield value, hardness or hardness index. This may extend the usefulness of the method. Motor‐driven penetrating devices…
The energy shift of the He 11S0−21P1 transition, ΔE(n), can be used to determine the density, n, of He in bubbles in metals. A self-consistent band structure calculation for solid fcc He yields a linear relationship ΔE=C.n with C th=22 × 10−3 eV nm3. Systematic electron energy loss spectroscopy and transmission electr…
Normal arteries have properties which match the low output impedance of the heart to the high peripheral impedance. These properties can be assessed in terms of compliance (% diameter change per unit pressure change) as well as by other haemodynamic parameters. Experiments were designed using vein, Dacron and expanded…
Measurements are presented in this paper of the pulsation amplitude of an individual air bubble that is levitated in a glycerine–water mixture by a stationary acoustic wave operating at a frequency of 22.2 kHz. Observations of the bubble pulsation for a wide range of bubble sizes demonstrate the existence of the n=2 h…
Eight new cardenolide glycosides, 19-deoxyuscharin (1b), 4′β-hydroxygomphoside (1k), 3′-didehydrogomphoside (1d), 3′-epigomphoside (1e), 3′-epiafroside (2e), 3′-epigomphoside 3′-acetate (1f), 3′-didehydroafroside (2d), and 3′-epiafroside 3′-acetate (2f), have been isolated from Asclepias fruticosa R. Br. The structure…
Abstract
The synthesis of tetra-arylporphyrins, for studies in solar energy conversion, is described. They are derived from 5,10,15,20-meso-tetrakis(4-hydroxyphenyl)porphyrin (4) which, in basic media, forms a green intermediate that is probably the tetraphenoxide (6). The porphyrins (10) and (13), were synthesised as prospect…
Dielectric investigations (65 K – 900K) and DTA investigations (300 K - 900K) have been carried out for AgNb, -Ta solid solutions. A series of anomalies were found in the temperature-dependence of the dielectric constant and loss tangent, as well as anomalies in the DTA curves associated with phase transitions. From t…
This paper presents torsional test results for six metals subjected to large shear strains and high strain rates. Included are 2024-T351 aluminum, 7039 aluminum, low alloy steel, S-7 tool steel, tungsten alloy and DU-.75Ti (Depleted Uranium). The specimens are strained to fracture at strain rates from quasi-static to…
L'ordre à courte distance dans les verres peut être étudié par différentes spectroscopies, sensibles soit à des facteurs géométriques (coordinance, distance métal-oxygène) soit de nature plus chimique (degré d'oxydation, covalence métal-oxygène). Nous présentons les résultats obtenus principalement sur les verres sili…
Abstract Crosslinking of 4,4′(bismaleimido)diphenyl ether (BM) was investigated in presence of bis( m ‐aminophenyl)methylphosphine oxide (BAP), tris( m ‐aminophenyl)phosphine oxide (TAP), diaminodiphenyl ether (E) and 3,3‐bis(p‐aminophenyl)phthalide (AP). These crosslinked resins were examined for thermal stability by…