Materials Literature
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Cross-sectional and plan-view transmission electron micrograph analysis of the structure of porous silicon reveals that the pore walls are also porous, yielding a large distribution of pore sizes for a given porous silicon sample. This infrastructure appears to be a universal morphological feature of porous silicon, i…
ABSTRACT Stress corrosion cracking (SCC) in nonmagnetic drill string components made of austenitic stainless steel alloys has been a long-standing industry-wide problem. Three currently available technologies, each capable of producing a zero frequency of SCC, are presented in this paper. The application of compressiv…
Abstract When applied as conformance treatments, foams are required to effectively reduce gas injectivities over prolonged periods of time. Frequently, this ability must be manifested in the presence of a residual oil saturation which often exerts a destabilizing effect on foam and the capacity to generate foam. In th…
The ability of algae and bacteria to accumulate heavy metals from the surrounding environment is a widely recognized phenomenon that has a number of important implications. This work reports on the development of a quantitative model that addresses the basic mechanisms inherent in many uptake processes. The model post…
We have previously reported on liposome formulations with reduced uptake by the reticuloendothelial system, prolonged circulation time, and enhanced accumulation in transplanted tumors. One of these formulations, consisting of hydrogenated phosphatidylinositol (HPI), hydrogenated phosphatidylcholine (HPC), and cholest…
Uncooked foods commonly possess only weak aromas and desirable aromas are generated upon cooking. For example, unroasted coffee beans possess a weak green, bean character while raw beef possesses a weak, slightly sweet, and bloody character. Numerous chemical reactions occur upon roasting and the typical, highly desir…
Temperature-dependent Mossbauer spectroscopy and variable temperature Fourier transform infrared techniques were employed to follow the spin conversion of Fe(BPTN)(NCS) 2 and Fe(TPA)(NCS) 2 complexes. The hyperfine interaction parameters and Debye-Waller factors were determined using the Mossbauer effect. The complexe…
The authors have studied the behaviour of an optical hole in the 3 A to 3 E zero-phonon absorption of the nitrogen-vacancy centre in type 1b diamond under the influence of an externally applied magnetic field. Spin cross relaxation and level anti-crossing phenomena in the 3 A ground state are displayed as sudden reduc…
The phase transition in the relaxor ferroelectric lead scandium tantalate, Pb(Sc0.5Ta0.5)O3, is investigated in both ordered and partly disordered (Sc, Ta disorder) modifications through the technique of hard-mode Raman spectroscopy. The vibrational modes for ordered para phase, ordered ferroelectric phase, disordered…
The structural slowing down in a binary alloy of soft spheres near the fluid-glass transition has been investigated by extensive molecular dynamics simulations. An attempt is made to characterise the transition on the basis of r- and k-space representations of the incoherent and coherent parts of the density autocorre…
The x-ray-photoelectron core-level linewidths show pronounced differences between atomic C, N, and O adsorbed on Ni(100). Furthermore, the widths are temperature dependent. The observed effects are reproduced within a model based on the creation of vibrational excitations in the core-ionization process. This explains…
The mode-coupling theory of the liquid-glass transition is applied to the hard-sphere system. The critical exponents and amplitudes characterising the slow relaxation of density fluctuations in the vicinity of the transition are calculated. Particular attention is devoted to the description of the frozen correlations…
The existence of classical phase diffusion in hysteretic junctions is demonstrated by quantitative agreement between experimental and simulated I-V curves. The simulations are based on a circuit that accurately models both the junction and its external shunting impedance at microwave frequencies. We show that the bias…
Subjecting natural diamond single crystals to the action of atomic hydrogen in a hydrogen plasma is shown to result in the passivation of interband states in the crystal resulting in a marked reduction in the resistivity to about 105 Ω cm from the expected high resistivity of∼1016 Ω cm. When the hydrogenated crystals…
We have implanted boron ions into insulating natural diamonds which were predamaged by carbon ion implantation in order to enhance the doping efficiency. All implantations were performed at liquid-nitrogen temperature. Subsequent rapid thermal annealing at 1100 °C produced strong new optical absorption bands near 1060…
Sharp structure between 2.60 and 2.64 eV observed in the cathodoluminescence spectra of synthetic diamond, following radiation damage and annealing at 300 degrees C, has been identified as a series of local-mode phonon replicas of the zero-phonon line at 2.807 eV. By examining the isotope shifts of these replicas in d…
Abstract The magnetic moment at 0 K of zinc‐substituted lithium ferrite is calculated, based on the spin‐canting model, for an accurate relationship between the moment and the substituent level of zinc. A modified computational plan is adopted in the calculation in contrast with those of recent publications so that a…
X-ray diffraction patterns of amorphous-polymer LB films were investigated in detail, and weak peaks at low 2θ angles were found to correspond to the film thickness. The diffractions are considered to be the results of Fourier transformation of two component systems: one at the interface of air and amorphous film, and…
Article A Thermodynamic Assessment of the Sb-Te System / Eine thermodynamische Optimierung des Systems Sb-Te was published on October 1, 1989 in the journal International Journal of Materials Research (volume 80, issue 10).
Abstract Field and mineralogical studies, supplemented by chemical analyses of charnockite and its derivative gneisses from one of the quarries between Ramalingapuram and Seshanchavadi along Attur valley have revealed retrogression of charnockite to biotite gneiss and onto ankerite-dolomite-bearing gneiss, involving a…