Materials Literature
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Transmission electron microscopy of single-cryatal non-stoichiometric spinel (MgO. 3–5 A12O3) deformed in compression at 1500°C have revealed dislocation networks in which the ½〈110〉 dislocations are extended by climb into ¼〈110〉 collinear partials. Dislocation nodes of two types are found, both of the form ½[110] + ½…
The cyclic deformation behaviour of silicon (3%)-iron single crystals has been investigated as a function of the number of cycles and the cyclic hardening curves have been correlated with the change of dislocation microstructures and surface slip patterns. The hardening curve can be divided into two parts, i.e. the ra…
The concentration‐dependence of cathodoluminescence efficiency for the rare earth (RE) activators Ce 3+ , Eu 3+ , Gd 3+ , or Tb 3+ in YAG is compared at 300° and 25°K and extends earlier work by the authors. Competitive recombination processes in the garnet phosphors include recombination at bulk lattice defect center…
Ion implantation has been used to produce crystalline phase transitions in nickel and 316 stainless steel. Doses of ∼1016 to 1017 ions·cm−2 of 40keV P+ at room temperature resulted in an f.c.c. to h.c.p. transition in nickel and an f.c.c. to b.c.c. transition in stainless steel. The orientation relationships between t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectral sensitization of the heterogeneous photocatalytic oxidation of hydroquinone in aqueous solutions at phthalocyanine-coated titanium dioxide powdersFu-Ren F. Fan and Allen J. BardCite this: J. Am. Chem. Soc. 1979, 101, 20, 6139–6140Publication Date (Print):September 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnisotropic mixed-valence systems. Dimers of the delocalized clusters [Ru3O(CH3CO2)6(L)3]n+John A. Baumann, Dennis J. Salmon, Stephen T. Wilson, and Thomas J. MeyerCite this: Inorg. Chem. 1979, 18, 9, 2472–2479Publication Date (Print):September 1, 1979Publication History Pub…
The corrosion rates of copper alloys 706 (90:10 Cu:Ni) and 715 (70:30 Cu:Ni) were measured, using rotating cylinder specimens in sea water that contained oxygen, sulfide, sulfur, and polysulfide, either singly or in combination. In addition a control test was performed using unpolluted deaerated sea water. Corrosion r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new view of the dynamics of singlet cis-trans photoisomerizationR. M. Weiss and A. WarshelCite this: J. Am. Chem. Soc. 1979, 101, 20, 6131–6133Publication Date (Print):September 1, 1979Publication History Published online1 May 2002Published inissue 1 September 1979https://…
We present a model to account for several major observations on growth control of animal cells in culture. This model is tested by means of kinetic experiments which show that exponentially growing animal cells whose ability to synthesize total protein has been inhibited with cycloheximide (by up to 70%) grow at rates…
Tests in a high-temperature autoclave for determination of the solubility of nitrogen of iron-chromium-manganese melts at 1600°C and pressures up to 25 bar. Discussion of the deviations from the Sieverts law. Determination of the interaction parameters of nitrogen.
TheM(H,T)isotherms of the hexagonal Laves phase materials Zr(FexAl1-x)2(0.56 \leq x \leq 0.74) were obtained experimentally in fields up to 72 kG and at a temperature 4.2 K. The resulting Arrott plots (M2versus H/M) show downturns from the linear behavior characteristic of weak itinerant ferromagnets in fields in the…
Variable-angle x-ray photoemission spectroscopy (XPS or ESCA) has been used to quantitatively determine the composition of the upper portion of oxide layers on the surface of In and PbInAu alloy films. The oxide layers were formed using a combination of thermal oxidation and rf oxidation, a process in which the films…
Abstract Salt‐affected soils are distributed throughout arid to semiarid regions of Iran. They occupy about 15% of the area in the country, an amount equal to the total arable land. These soils are formed in level to depressional landform positions under the influence of a fluctuating ground water table. Three pedons…
For pt.II see ibid., vol.8, p.2389 (1978). The intermetallic compound Fe 3 Sn 2 has been studied by 119 Sn Mossbauer spectroscopy between 5 and 670K. Between approximately 60 and 250K the spins rotate from the basal plane to the c axis; a fraction alpha (T) of the spins remain in the basal plane while the remainder ro…
A material-related model for thermal fatigue is presented and discussed in connection with tool steels in hot-work applications. The model, which is based on ordinary ‘fatigue laws’, includes a simplified stress/strain analysis for the general thermal fatigue case. From this analysis expressions are generated which re…
Abstract Vulcanization is a process which decreases the plastic properties of rubber while maintaining or improving the elastic properties. The term vulcanization has been applied in the past mainly to the reaction of rubber with sulfur, but now is generally used for the process which results in changes in properties,…
Abstract The stress‐strain and impact loading behavior of simultaneous interpenetrating networks (SIN's) based on three elastomers derived from polymerized castor oil and polystyrene was studied. The elastomers included the sebacic acid polyester, the 2,4‐tolylene diisocyanate (TDI) polyurethane, and the mixed sebacic…
ABSTRACT The “double thecae” or “internal septa” of Eunotia soleirolii (Kütz.) Rabenh, are shown to represent the thecae of resting spores, as characterized by their physiology, as well as morphology. They differ from all resting spores of centric diatoms by the formation of both their valves as a result of unequal ce…
The Gurney energy method, an analytical method with which to compute fragment velocity distributions for continuous casing warheads, is reviewed and a method to model velocity losses due to end effects on cylindrical charges and end projector type warheads is presented. The Taylor formula, which estimates the angle of…
Abstract Methods for determining the crystallisation characteristics of polymer by differential scanning calorimetry are discussed, particularly in terms of their limitations. Isothermal and non‐isothermal crystallisation thermogrphs are analysed to determine crystallisation mechanism and compared with other technique…