Materials Literature
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Surface-enhanced Raman scattering (SERS) of 3,5-pyridinedicarboxylate on colloidal gold in aqueous media and of the azo dye, dabsyl(N-4-dimethylaminoazobenzene-4′-sulphonyl) aspartate (DABS-ASP), on colloidal gold in ethanol was observed. Enhanced Raman spectra and excitation profiles over wavelengths 457.9–676.4 nm w…
Pulse radiolytic oxidation of zinc tetrakis(hydroxyphenyl)porphyrins in neutral solution results in formation of the π-radical cations which decay via disproportionation over a few ms. In alkaline solution, the hydroxy groups are dissociated and for the ortho and meta isomers the rate of disproportionation is reduced…
SUMMARY The wear algorithm described In this paper has the capability to predict the shapes into which rail vehicle wheels and rails wear in tangent track use. Results of the algorithm applied to a freight car model show that the wheel profiles wear into shapes that are nearly identical for four different wear model f…
The crystal structure of a carbonyl–1-methylimidazole–iron(II) porphyrin complex with one highly hindered face has been determined; the structural parameters indicate that the twelve membered polymethylene bridging chain does not induce steric deformation of the axial carbonyl ligand.
Thermal image furnace melting and twin-roller quenching were used to prepare glasses containing large amounts of rare earth oxides in Ln2O3-MXOY systems (Ln2O3=La2O3, Nd2O3, Y2O3; MXOY=SiO2, Al2O3, TiO2, Nb2O5).The glass-forming regions were found at the following compositions close to the eutectic points of the phase…
General effects of five types of ageing on textiles are examined. The types of ageing discussed are physical, photochemical, thermal, chemical and mechanical. Changes in the structure and properties of textiles that result from each type of ageing are discussed in general terms. This paper is expected to provide conse…
The effect of various surface treatments (grinding, polishing, and pickling) and of prefilming (anodizing and passivation). On the susceptibility of aluminium to pitting in 0·5M NaCl solution at 20°C under various hydrostatic pressures has been studied. It was found that the susceptibility to pitting increased and tha…
A. total often extracts of two plants Pleioceras barteri Baill and Marsdenia latifolia Schum, normally used in folkloric medicine in Nigeria have been screened for their phytoconstituents and implicated biological activity. Nine (90%) of the extracts gave positive test for alkaloids, four (40%) for flavonoids, five (5…
New measurements are reported of the elastic constants and refractive indices of the room temperature nematics RO-TN-200, -201, -403 and E7. The new measured material parameters show that the purely optical field induced first-order Freedericksz transition can not be attained by these materials. However, the first-ord…
Two new C_(21) steroidal constituents, named otophylloside A(Ⅳ) and otophylloside B(Ⅴ), have been isolated from the roots of Cynanchum otophyllum Schneid, whose structures have been analysed in this paper by using X-ray crystallography and spectrometric data (UV, IR, ~1H- and ~(13)C-NMR, MS) and chemical reaction. The…
Abstract A calculation of the implicit shift to the phonon energies for phonons in deuterated naphthalene at q = 0 is presented, the “explicit shift” having been already described in an earlier paper. With this the calculation of the shift in the phonon energies due to temperature becomes complete and consistent, read…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA simple relationship between rate of color change and molecular weight of a photochromic spiropyran polymerEfim Goldburt and Valeri KrongauzCite this: Macromolecules 1986, 19, 1, 246–247Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Pu…
The combined representation of experimentally determined crystal structures and calculated periodic potential surfaces is possible with a new program system. It is shown that the zero potential surfaces in particular are topologically very similar to the corresponding periodic minimal surfaces of the same symmetry. Th…
In some N(p-n-alkoxy benzylidene) p-n-alkylanilines the refractive indices ne, no and the order parameter are measured as a function of temperature. From the experimental data the molecular polarizabilites and its anisotropies at different wavelengths were calculated using different internal field models. The merits o…
This paper describes the utility of acoustic emission (AE) for the detection and monitoring of corrosion, stress corrosion cracking (SCC), and corrosion fatigue (CF). It comprehensively surveys laboratory studies and field applications that have been made to date. How to apply the technique to fundamental studies in t…
The first synthesis of two covalently linked mixed phthalocyanine–porphyrin dimers especially designed for the study of photoelectron processes is presented along with the very efficient intramolecular energy transfer from the porphyrin toward the phthalocyanine moiety under light irradiation in one of these compounds.
Muon-spin-rotation experiments were performed on the ferromagnetic compounds ${\mathrm{GdFe}}_{2}$, ${\mathrm{GdCo}}_{2}$, ${\mathrm{YFe}}_{2}$, ${\mathrm{LuFe}}_{2}$, and ${\mathrm{ErFe}}_{2}$. The local magnetic field at the positive-muon site and the muon-spin-relaxation rates were measured as a function of tempera…
The nuclear-magnetic-resonance method was used to study the diffusion of hydrogen in zirconium hydride by measuring the temperature dependence of ${T}_{1}$ in a temperature range where the major relaxation mechanism was due to hydrogen diffusion. The samples investigated were ${\mathrm{ZrH}}_{1.588}$, ${\mathrm{ZrH}}_…
We have used a cloned chicken collagen cDNA sequence to help identify hypothetic members of the collagen gene family from Drosophila melanogaster. Several experimental evidences have been obtained which indicate that the Drosophila genome contains numerous collagen-like sequences. We have characterized in more detail…
The diffusion of hydrogen in nickel and copper, and in fcc nickel-copper and nickel-cobalt alloys has been investigated over the temperature range from 260 to 1000 K by a technique of electrochemical permeation and a technique of gas phase permeation. The temperature dependence of the diffusion coefficient of hydrogen…