Materials Literature
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The thermomechanical behavior of passivated thin copper films is studied. Stresses in copper films of thickness ranging from 125 to 1000 nm, deposited on quartz or silicon substrates and passivated with silicon oxide, were measured using the curvature method. The thermal cycling spans a temperature range from −196 to…
High‐resolution solid‐state 31 P, 27 Al, and 23 Na nuclear magnetic resonance (NMR), Raman spectroscopy, differential scanning calorimetry, and density measurements were used to characterize the local structure of the glasses (1− x )(NaPO 3 ) 3 · x Al(PO 3 ) 3 . A systematic increase in density, glass transition tempe…
Nous avons etabli la composition de 135 echantillons de mineraux du groupe de l'astrophyllite provenant de 151 endroits au moyen de la microsonde electronique, des analyses ICP-AES, spectrometrie infra-rouge avec transformation de Fourier, analyse thenmogravimetrique, decomposition thermique, analyse par reactions nuc…
Room‐temperature debonding and sliding of fibers coated with La‐monazite is assessed using a composite with a polycrystalline alumina matrix and fibers of several different single crystal (mullite and sapphire) and directionally solidified eutectic (Al 2 O 3 /Y 3 Al 5 O 12 and Al 2 O 3 /Y‐ZrO 2 ) compositions. These f…
Abstract Water extracts from leaves of date palm, phoenix dactylifera , henna, Lawsonia inermis , and corn, Zea mays , were tested as corrosion inhibitors for steel, aluminum, copper and brass in acid chloride and sodium hydroxide solutions using weight loss, solution analysis and potential measurements. The inhibitio…
Abstract The effect of CO 2 on the isothermal crystallization kinetics of poly(ethylene terephthalate), PET, was investigated using a high‐pressure differential scanning calorimeter (DSC), which performed calorimetric measurements while keeping the polymer in contact with presurized CO 2 . It was found that the crysta…
Hiroshi Miyamoto, Masato Yano, Tomoyuki Miyashita; Similarities in the structure of nacrein, the shell-matrix protein, in a bivalve and a gastropod, Journal of
The magnetic field in many magnetic components, namely toroids and EE cores, has a three-dimensional (3-D) distribution. Energy and losses calculation in these particular structures makes necessary the use of 3-D techniques that accounts for all 3-D effects. The calculation of the energy and losses is needed in order…
Thin films of Sr2FeMoO6 have been deposited on single-crystalline and polycrystalline SrTiO3 substrates by pulsed laser deposition from a stoichiometric target. In order to obtain high-quality films, the deposition parameters were systematically optimized. The films grown under optimized conditions show properties com…
Abstract ESI‐MS analysis provides a straightforward tool for the solution characterization of highly charged mono‐lacunary Keggin‐type polyoxotungstates α‐[XW 11 O 39 ] p − (X = Si, P; p = 8, 7). Doubly and triply charged quasi‐molecular ion peaks were identified on the basis of both the theoretical simulation of the…
The increasing utilization of sea water as a medium for transportation, communication, energy generation, oil and mineral exploitation and as an industrial fluid has direct impact on problems associated with the maintenance of marine structures and machinery. Keeping this in mind, numerous investigations on the corros…
This article presents a method for solving moving-boundary problems associated with phase change. This method is an explicit interface-tracking scheme that involves the reconstruction and advection of the moving interface on a fixed grid. Three distinct steps are undertaken to handle the movement of the interface: adv…
Abstract The paper describes the synthesis of starch phosphate carbamides by reacting starch with phosphoric acid and urea. A solid state technique in vacuum at elevated temperatures is used. The degree of substitution of phosphate (DS P ) and carbamide groups (DS C ) can be adjusted by the molar ratio of starch: phos…
Magneto-optical spectroscopy of a transparent ferromagnetic semiconductor, anatase TiO 2 doped with Co, is carried out at room temperature. A large magneto-optical response with ferromagnetic field dependence is observed throughout from ultraviolet to visible range and increases with increasing Co content or carrier c…
Brownian-dynamics computer simulations show a dynamical crossover in a strongly interacting colloidal suspension consisting of oppositely driven particles, wherein a uniform state transforms, with increasing driving force, into a locally demixed state characterized by strongly anisotropic stripe-like domains which are…
Generalized fractional relaxation equations based on generalized Riemann-Liouville derivatives are combined with a simple short time regularization and solved exactly. The solution involves generalized Mittag-Leffler functions. The associated frequency dependent susceptibilities are related to symmetrically broadened…
The outstanding space charge storage stability of porous polytetrafluoroethylene (PTFE) film electrets is studied by isothermal surface potential decay measurements and open-circuit thermally stimulated discharge (TSD) experiments after corona charging at room and elevated temperatures, or corona charging at RT and th…
Abstract A series of polyimides has been synthesized based on different dianhydrides and diamines. The microstructure of polyimide films has been analyzed by performing density measurements, X‐ray diffraction and UV‐visible spectrophotometry. The dynamic mechanical behavior was investigated according to both chemical…
Abstract The exact nature of tripuhyite remains controversial more than 100 years after the first description of the mineral. Different stoichiometries and crystal structures (rutile or tri-rutile types) have been suggested for this Fe-Sb-oxide. To address these uncertainties, we studied tripuhyite from Tripuhy, Minas…
Nous avons affine la structure de la nikischerite, Na Fe 2 + 6 Al 3 (S0 4 ) 2 (OH)(H 2 0) 1 2 . rhomboedrique, a 9.347(1), c 33.000(7) A, V 2497(3)A 3 , Z = 3, R3, jusqu'a un residu R de 6.4% en utilisant 444 reflexions observees, mesurees avec rayonnement MoKα. La structure est faite de feuillets planaires d'octaedre…