Materials Literature
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The role of H in causing rapid transgranular s.c.c. in α-Ti alloys is discussed in detail inrelation to the hypothesis that H enters the unfilmed surface at the crack tip and causes slow strain-rate embrittlement. The protective role of cathodic protection in neutral solutions, the relatively slow rate of H diffusion…
The Mössbauer spectra of a large number of iron(II) low-spin compounds are reported. Together with the Mössbauer spectra of other low-spin compounds reported in the literature, we have derived partial centre shifts (p.c.s.) for 37 ligands and partial quadrupole splittings (p.q.s.) for 16 ligands. There is an inverse c…
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This paper explains and advocates the use of a Laplace-transform steepest-descent method for the computation of energy-level densities g(E) by inversion of the partition function. The earlier Lin–Eyring approach, based on the Darwin–Fowler method, is shown to be unnecessarily obscure and in part redundant By use of a…
Methylpyrrole carboxylic esters generally are reductively methylated at 25–45°. Some are also reductively alkylated by aliphatic aldehydes generally to give, for example, 2,3(or 2,4)-dimethyl-4(or 3)-alkyl-5-carbethoxypyrroles, using hydriodic acid or HCl/AcOH–Zn/Hg respectively. An analogous alkylation by glyoxylic a…
The ocean environment (Factors affecting the corrosivity of seawater, Forms of corrosion); Corrosion of metals in the marine environment (Carbon steel, Low-alloy steels, Stainless steels, Nickel and nickel-base alloys, Cobalt, Copper and copper-base alloys, Titanium and titanium-base alloys, Aluminum and aluminum-base…
In vitreous silica, which has been compacted by irradiation with fast neutrons, the ultrasonic absorption, the excess heat capacity and the magnitude of the negative coefficient of thermal expansion decrease. In this work we report measurements of the far infra-red absorption and Raman scattering in such neutron compa…
Although originally proposed for high-angle boundaries, a relation of the Hall–Petch type has been applied by a number of authors to low-angle boundaries produced by high-temperature deformation. Investigations published to date include data on commercially pure Al and Fe and on silicon steel; in these studies room-te…
The probability of cooperative energy transfer from two excited ions to a nearby ion is computed and compared with the probability of excitation by stepwise energy transfer. For ${\mathrm{Yb}}^{3+}$ sensitization of ${\mathrm{Er}}^{3+}$, ${\mathrm{Ho}}^{3+}$, and ${\mathrm{Tm}}^{3+}$ activated hosts, the cooperative t…
Experiments are described on the deformation of copper, both in the form of long straight wires and in the form of helices, with the aim of evaluating the importance of diffusion-creep processes, especially in the range where the effect of grain-boundary diffusion is expected to predominate. It is established that at…
Abstract An equation is proposed relating the glass transition temperature ( T G ) of copolymers to their molecular structure in terms of the mole fractions of the various diad sequences of monomer units combined in the copolymer chain, and temperature parameters ( T ij ) characteristic of each type of sequence, ij .…
Proton magnetic resonance provides direct evidence for the inclusion nature of cyclohepta-amylose complex formation with aromatic substrates.
Recently, there has been considerable interest in heterophase polymer systems which possess enhanced physical properties in the elastomeric state. These systems, with their improved properties, greatly expand the list of available engineering materials and the possibility of designing a material to perform in a given…
The position and shape of the energy bands of the following transition metals have been studied by ESCA: Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Os, Ir, Pt, Au. The Fermi levels of the metals with unfilled d -bands are found in the high-energy flanks of the valence band spectra. For the noble metals the Fermi level is shifted…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance studies of some cobalt(II) Schiff base compounds and their monomeric oxygen adductsBrian Mark Hoffman, Damon L. Diemente, and Fred BasoloCite this: J. Am. Chem. Soc. 1970, 92, 1, 61–65Publication Date (Print):January 1, 1970Publication History…
Abstract not Available.
Threads per inch and yarn count are some of the most important parameters that affect both weaving performance and fabric property. Experimental studies were conducted by weaving fabrics with three different picks per inch (PPI) and weft counts. The study shows that weaving performance is affected by the too high cove…
Natural rubber latex (NRL) and n-butyl acrylate (n-BA) were blended and irradiated at various absorbed doses by gamma rays from Co-60 source at room temperature. The stabilizing effect was determined by measuring the pH and viscosity of NRL with n-BA with the storage time of five weeks. The cross-link density, swellin…
Since the innovation of the practical tungsten-halogen lamp employing iodine as the regenerating agent, there has been continuous research and development in this field of lamp technology. Although there are still gaps in our knowledge, particularly regarding the kinetics of certain reactions, there is now a far bette…
A thermogravimetric method is described for the quantitative analysis of mixtures of calcium hydrogen orthophosphate dihydrate (brushite) and anhydrous calcium hydrogen orthophosphate (monetite) based on their loss of water on heating. An extension to the method when the above system contains a third component of know…