Materials Literature
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We perform traction experiments on viscous liquids highly confined between parallel plates. At small separation rates, we observe a simple response with a smooth decrease of the force. Dramatic changes in the force response occur at high separation rates, with the appearance of a force plateau followed by an abrupt dr…
The high-temperature (over 1020 degrees C) polymorph of ZnS, wurtzite ZnS, has been successfully prepared through a low-temperature (180 degrees C) hydrothermal synthesis route in the presence of ethylenediamine (en). The effects of en concentrations, reactant concentrations, reaction temperatures, and reaction times…
Sintered corundum components with submicrometer grain sizes exhibit properties which enable numerous new applications. Wet powder processing is developed to associate minimum grain sizes at highest densities with the lowest population of macrodefects. A closest ratio of powder particle size and sintered grain size is…
We report on the low-temperature magnetic ac-susceptibility of antiferromagnetic DyPO4 nanoparticles with a very high surface to volume ratio. The results are interpreted in terms of superparamagnetic relaxation of the Neel vector arising from a relatively large number approx 0.2 Na of uncompensated spins probably exi…
Noise rejection, defect identification and degradation diagnosis in on-field partial discharge measurements are sought by industry, but hardly achieved in practice. This paper presents tools for automatic noise suppression in measurements performed by ultra wide band digitizers, able to record a large quantity of part…
Monodisperse and high-surface-area mesoporous inorganic spheres of various compositions including metal oxides, mixed oxides, and metal phosphates are prepared by templating mesoporous carbon spheres which are replicated from spherical mesoporous silica. Due to the rigid and thermally stable framework of carbon templa…
Assuming that aging of polymeric insulation consists of irreversible chemical-physical and microstructural modifications, effective ageing markers could be achieved from measurements of properties, which should vary with material microstructure. Among these properties this paper focuses on the estimation of apparent t…
By incorporating an achiral diazine ligand, 2-pyridylmethylketazine, which can be locked in a chiral conformation upon coordination, into the manganese(II)-azido system, we induced a homochiral 2D network, in which neighboring Mn(II) ions are bridged via a diazine and two end-on azido ligands into chiral dimeric units…
A model is proposed for general corrosion of mild and low-alloy steels under fully aerated at-sea immersion conditions as measured by weight loss. Because all factors influencing corrosion have inherent uncertainties, the proposed model is probabilistic, composed of a mean-value function and a zero-mean uncertainty fu…
Layer-by-layer (LBL) assembly is the ideal processing technique to combine two electrochromic polymers into a single thin film composite with fine control over morphology and composition. Here we present a very-high-contrast electrochromic composite developed from the LBL assembly of two readily available cathodically…
Achieving acceptable levels of sensitivity during online and/or onsite partial discharge (PD) measurements still continues to remain a very challenging task, primarily due to strong coupling of external (random, discrete spectral and stochastic pulsive) interferences. Many analog and digital approaches have been propo…
We calculate magnetization in magnetically doped semiconductors assuming a local exchange model of carrier-mediated ferromagnetic mechanism and using a number of complementary theoretical approaches. In general, we find that the results of our mean-field calculations, particularly the dynamical mean-field theory resul…
It has been shown that a water drop can bounce persistently, when thrown on a super-hydrophobic substrate. We present here scaling arguments which allow us to predict the maximal deformation and the contact time of the drop. This approach is completed by a model describing the flow inside the drop, and by original exp…
High molecular mass poly(lactide), (PLA), is an attractive polymer family because in addition to being thermoplastic, biodegradable, compostable, and produced from annually renewable resources, it shows mechanical and barrier behavior comparable to synthetic polymers like polystyrene (PS) and polyethylene terephthalat…
Short circuit currents or forces during transport can cause mechanical displacements of transformer windings. The transfer function method is presented as a tool to detect these displacements. In order to be able to evaluate the measurements, the correlation between the characteristics of transfer functions and possib…
Abstract Bulk gold is chemically inert and is generally regarded as a poor catalyst. However, when gold is in very small particles with diameters below 10 nm and is deposited on metal oxides or activated carbon, it becomes surprisingly active, especially at low temperatures, for many reactions such as CO oxidation and…
The structure of Ba2CoSi2O7 consists of layers made from corner-sharing of [SiO4] and [CoO4] polyhedra. These layers, lying parallel to (001), are linked by Ba⋯O interactions. Co2+ forms flattened CoO4 tetrahedra (point symmetry \overline 4), which are isolated in the structure. The blue color of the solid might be ex…
The viscous drag of dislocations is known to increase when a phase transition of the host material is approached. Previous discussions of this effect, however, have overlooked that, above the bulk transition point, the ordered phase can already nucleate along the dislocations. The viscous-drag component due to energy…
The optical absorption spectra of BaF 2− x Cl x :Eu in different states of optical storage were measured to clarify the electron trapping mechanism for its optical storage and photo-stimulated luminescence (PSL). Based on the absorption spectra and difference absorption spectra, the electron transfer processes after u…
The crystal structures of the two polytypes of the compound CaMgB 2 O 5 , kurchatovite and clinokurchatovite, were determined in the space groups Pc2 1 b and P2 1 /c respectively by Yakubovich et al. (1976) and Simonov et al. (1980). The crystal structures of both minerals have been re-examined and refined until R obs…