Materials Literature
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The instantaneous-normal-mode (INM) densities of states (DOS) of Na in the supercooled-liquid and glassy states under constant pressure have been calculated via molecular-dynamics simulation, with a rapid quenching rate for the glassy states. In the glassy states, at frequencies less than ${\ensuremath{\omega}}_{m},$…
Abstract The dependence of the dynamic behaviour of the smectic C* layer reorientation on application of asymmetric electric fields is investigated for different surface treatment of the glass substrates, varying the alignment layer materials and rubbing conditions. It is found that already weak monostable anchoring l…
We present experiments on nanocrystalline materials where thermal activation gives rise to dynamic effects on hysteresis curves. A scheme of interpretation is presented and the typical activation volume is found to be about 100 nm.
We reconsider the problem of electronic transport across a heterojunction interface connecting two materials with different effective masses. Thermionic current does not remain invariant when the position X/sub int/ of the interface is shifted relative to that of the potential energy maximum, X/sub max/, even if the s…
The specific heat of the ceramic and the permittivity of a single-crystal sample of LaBSiO 5 , a new ferroelectric in the stilwellite family, were measured in a temperature range which includes the phase transition point ( T C =140 °C). The excess entropy of the phase transition Δ S =1.05 J/mol · K and the Curie-Weiss…
Sorption and permeation of allyl isothiocyanate vapor (AIT, an antimicrobial flavor compound from Cruciferae plants) in nylon 6,6 film were investigated in this study. AIT sorption by the dry nylon film was low (=0.5%, w/w), but increased to a maximum =3.5% as relative humidity (RH) increased. Above 70% RH, the decrea…
A C-centred monoclinic phase (M) with aM = 3.31 nm, bM= 1.23 nm, cM =2.48 nm and β = 112° has been found in both Al66Co9Cu6W19 and Al12 FeCr alloys. It is shown by both electron diffraction and high-resolution electron microscopy (HREM) that this monoclinic phase is an ordered superstructure of the body-centred orthor…
This paper concerns a magnetic sensor using a vicalloy wire with uniaxial anisotropy and torsion stress. In the magnetic sensor using a compound magnetic wire, the relationship between wire length, magnetization state and the output voltage based on the large Barkhausen jump was investigated. When the specimen wire wa…
MgO has important potential uses as a buffer layer for growth of perovskite and related oxides on GaAs. Equilibrium thermochemical data indicate MgO will be stable against interfacial reaction with GaAs but, under molecular beam epitaxy growth conditions, kinetic limitations can increase the probability of an undesire…
Abstract Iron-containing carbons were prepared from mixtures of ferrocene and poly(furfuryl alcohol) by varying their preparation conditions. The electrocatalytic activity of the carbons was assessed with Fe(CN)63−/Fe(CN)64− redox reaction, and was revealed to be strongly affected by the fraction of a turbostratic car…
Two types of high-efficiency amorphous methacrylic azobenzene polymer for reversible holographic storage are synthesized. It is shown that their efficiency is due to both photoinduced linear birefringence and surface relief. The contributions of these two effects on the diffraction efficiency of the holographic gratin…
Pb(Zr, Ti)O 3 (PZT) thin films have been grown on Si/SiO2 and Si/SiO2/Ti/Pt substrates by rf magnetron sputtering and the effects of PbTiO3 (PT) buffer layers to the structural and electrical properties of PZT films were studied. The PT buffer layers were grown in situ (without postannealing) with thicknesses ranging…
Abstract Oxidative stability and retained operational utility of polymers used as insulation for electrical cables, such as ethylene propylene diene monomer (EPDM) and crosslinked polyethylene (XLPE), may be assessed by oxidation induction time (OIT) analysis. OIT is measured directly with a differential scanning calo…
Electrical conductivity and dielectric properties of single-crystal TlGaSe 2 have been studied as a function of γ irradiation dose in the 100–280 K range including the existence of an incommensurate phase. Anomalies in the form of maxima have been observed in the σ = f ( T ), tan δ = f ( T ), and ɛ = f ( T ) curves at…
The oxidation of 1,2,5-trimethylpyrrole (TMP) in aqueous and organic solvents is studied by various techniques. Heating oxygenated chlorobenzene solutions of TMP results in autoxidation that is initiated via reaction of TMP with O 2 and partly propagated via oxidation of TMP by a TMP-derived peroxyl radical. In radiol…
The van der Waals epitaxy of InSe films was performed on (111)GaAs surface at the growth temperature of 350°C. A spiral trigonal structure was observed on the surface of the InSe films. To improve crystal quality of the InSe films, their orientation control was investigated. The growth rate decreased rapidly as the gr…
The effect of the pressure-pulsed chemical vapour infiltration on improving the quality of CMC-parts has been investigated. In a fabrication process of three-dimensional C/SiC composites, the PCVI was applied as a final densification step for specimens made by a joint process consisting of slurry infiltration and poly…
Polyester dendrimers bearing carbazole units at their peripheries were synthesized by attaching 3,5-bis[4-(9-carbazolyl)butoxy]benzoic acid to the peripherical phenoxy groups. The phenoxy-terminated polyester dendrimers were synthesized by hydrogenation of the corresponding benzyloxy-terminated polyester dendrimers. T…
TAD1 is a psychrophilic strain isolated from continental frozen water in Antarctica. Study of aspartate transcarbamylase in the bacterium shows an impressive activity of this enzyme at low temperature. At 0 degree C, its activity is up to 26% of its maximal activity observed at 30 degrees C. In comparison with the Esc…
The (1)H NMR spectra of a series of manganese-oxo aggregates have been examined, and a characteristic signature was found for each complex. For the dimanganese(III,III) complexes [Mn(2)O(OAc)(2)(HB(pz)(3))(2)], [Mn(2)O(OAc)(2)(tacn)(2)](2+), [Mn(2)O(OAc)(2)(H(2)O)(2)(bpy)(2)](2+), and [Mn(2)O(OAc)(2)(bpta)(2)](2+) (HB…