Materials Literature
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Dye quantum yield is generally measured using the method of Williams, which consists in comparing the absorbance and the emission of the dye to test with those of a reference. Unfortunately, this method is no more applicable when the sample presents some significant scattering which is, for instance, the case when the…
We report on successful synthesis under high pressure of a series of polycrystalline GdFeAsO1 − x F x high-T c superconductors with different oxygen deficiency x = 0.12−0.16 and also with no fluorine. We have found that the high-pressure synthesis technique is crucial for obtaining the single-phase superconducting mat…
Aromatic polyamides are high performance materials with superior thermal and mechanical properties which make them extremely useful for advanced technologies. These polymers can be transformed into high-tensile strength synthetic fibers and into flame and cut-resistant materials that have technological applications in…
Plasma facing materials, the materials that line the vacuum vessel, experience particularly hostile conditions as they are subjected to high particle and neutron flux and high heat loads. Plasma facing materials must have high thermal conductivity for efficient heat transport, high cohesive energy for low erosion by p…
Unique epitaxial two-phase vertically aligned nanocomposite (VAN) (BiFeO3)x:(Sm2O3)1−x thin films were deposited on SrTiO3(001) substrates by pulsed laser deposition. The VAN thin films exhibit a highly ordered vertical columnar structure with high epitaxial quality. We demonstrate that the strains of the two phases i…
The volume of a bubble in a piezoinkjet printhead is measured acoustically. The method is based on a numerical model of the investigated system. The piezo not only drives the system but it is also used as a sensor by measuring the current it generates. The numerical model is used to predict this current for a given bu…
Abstract The mechanical properties and dynamic behavior of thermoplastic composites based on polypropylene/glass fibers and polypropylene/natural fibers (i.e. kenaf, hemp, flax) are presented. A survey is given on some aspects, crucial for the use of these composites in structural and non‐structural components such as…
A suite of basaltic glasses were examined to determine how subtle compositional changes affect mid-infrared spectra (650 to 5400 cm -1 ). Glasses with different SiO 2 , FeO total, Fe 3+ /Fe 2+ , and alkali contents were synthesized in a gas-mixing furnace and analyzed using electron probe microanalysis, Mössbauer spec…
Although benthic diatoms are used to assess river water quality, there are few data on the rate at which diatom assemblages react to changes in water quality. The aim of this study was to assess the reaction time of diatoms and to discuss the changes occurring during water quality improvement on the basis of their aut…
High-temperature Raman spectroscopy was applied to study model silicate melts in the M2O-SiO2 system, where M = K, Na, or Li. Structural units of the melts and equilibrium constants of reactions between them are determined. Thermodynamic calculations were conducted for the dependence of the Q n distribution on the com…
The present IEC 60587 IEC standard needs several improvements which would help manufacturers of power equipment and material suppliers to assess outdoor polymeric materials in a more reliable way.
Proper application of error analysis techniques remains uncommon in most EXAFS analyses. Consequently, many researchers in the community remain distrustful of parameter-error estimates. Here, we demonstrate the accuracy of conventional methods through r -space fits to simulated data. Error estimates are determined as…
The modified transverse Ising model taking into account the four-spin exchange interaction and quantum fluctuation, as well as the mechanical constraint of the substrate, is constructed and applied to investigate the electrocaloric effect (ECE) in BaTiO3 thin films. It is found that the temperature dependence of ECE s…
On étudie la limite hydrodynamique de systèmes de particules évoluant selon une dynamique de Kawasaki dont le taux de saut est nul si la configuration ne satisfait pas à des contraintes locales particulières. Ces modéles appartiennent à la classe de modéles avec contraintes cinétiques qui ont été introduits et etudiés…
Chronic perforations of the eardrum or tympanic membrane represent a significant source of morbidity worldwide. Myringoplasty is the operative repair of a perforated tympanic membrane and is a procedure commonly performed by otolaryngologists. Its purpose is to close the tympanic membrane, improve hearing and limit pa…
The total energy and bulk properties of Fe 3 Al X ( X =B, C and N) with anti-perovskite structure at T =0 K were calculated by using the projector augmented-wave (PAW) approach within generalized gradient approximation (GGA) and local density approximation (LDA). The lattice constant, bulk modulus and its pressure der…
Micrometer-size graphene ribbons are generated by epitaxial growth on SiC substrates and contacted by electron beam lithography. The isolated graphene islands are patterned at nanometer scale by atomic force microscopy (AFM) under the application of an external polarization to the graphene layers. Contrary to previous…
A steady state axi-symmetric model was developed to predict the size, shape and temperature of a laser-sustained plasma in flowing argon. The power of the carbon dioxide (CO2) laser and the free stream gas velocity were inputs to the model. An algorithm, which is an alternative to the ray tracing method, was used to c…
Tonpilz transducers are fabricated from 001 fiber-textured 0.72Pb(Mg(1/3)Nb(2/3))O(3)-0.28PbTiO(3) (PMN-28PT) ceramics, obtained by the templated grain growth process, and PMN-28PT ceramic and Bridgman grown single crystals of the same composition. In-water characterization of single element transducers shows higher s…
Porosity and void characteristics of two major Acrisols (Ferric Acrisol and a Ferri-Plinthic Acrisol) with contrasting pedogenic features from the humid forest zone of Ghana were studied by X-ray computed microtomography. Spatial variability of the porosity of the two Acrisols, as well as the volume of different class…