Materials Literature
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The interaction between polyaniline (PAn) and 2,5-dimercapto-1,3,4-thiadiazole (DMcT) was investigated by means of cyclic voltammetry and UV-visible spectroscopy. The results show that the polymerization-depolymerization reaction of DMcT or its dilithium salt Li 2 DMcT is a kinetically quasi-reversible process. PAn ex…
A rigorous mathematical model is developed for the complex impedance of a solid-state electrochemical cell, which is commonly used for the measurement of oxygen transport, oxygen exchange kinetics, and thermodynamic properties of nonstoichiometric mixed conducting oxides. The model leads to a simple equivalent circuit…
A constitutive model with a thermal activation plastic component combined with a Maxwell‐Weichert linear viscoelastic component was applied to describe the dynamic elastic and plastic stress‐strain behavior of polytetrafluoroethylene as a function of temperature, strain rate, and pressure. The linear viscoelastic comp…
Properties and application of aliphatic polyester products (Masatsugi Mochizuki) Aliphatic polyesters (Ann--Christine Albertson and Indra K. Varma) Biodegradable polyester Biopol(R) (Jawed Asrar and Kenneth J. Gruys) Applications of PHAs in medicine and pharmacy (Simon F. Williams and David P. Martin) Polylactides (Hi…
Waste from the manufacture of chrome-tanned leathers (so-called shavings) can be processed (apart from alkaline or acid breakdown) by enzymatic hydrolysis employing alkaline proteases. Under mild reaction conditions, a soluble collagen hydrolyzate is formed and a solid fraction (so-called chrome cake) with high chromi…
We introduce Randomized Local Balance (RLB), a routing algorithm that strikes a balance between locality and load balance in torus networks, and analyze RLB's performance for benign and adversarial traffic permutations. Our results show that RLB outperforms deterministic algorithms (25% more bandwidth than Dimension O…
The aim of this work is to present radar cross section (RCS) measurements of a panel constituted of a flat aluminum plate with and without radar absorbing materials (RAM) type thin rubber sheets, in the range of 8 – 12 GHz. Two different loads were evaluated in the RAM formulation: 1. Magnetic (ferrites - MnZn, NiZn a…
Le comportement a l'adsorption des complexes de polymeres formes par le polysaccharide anionique, l'acide pectique (acide polygalacturonique) et le polyelectrolyte cationique, poly-DADMAC, a ete etudie. Dans l'electrolyte de NaCl, il ne s'est forme aucun precipite macroscopique ni complexes solubles et colloidaux. L'a…
Abstract Infrared (IR) spectroscopy is a common technique with spectrometers capable of good-quality mid-IR absorption data (i.e., in the 400 to 4000 cm −1range) available in most undergraduate chemistry teaching laboratories. Sample preparation is relatively simple and requires only KBr powder, a die press, and a bal…
Several technical parameters were studied during the fermentation of recombinant E.coli for the production of collagen-like biopolymer.The effects of dissolved oxygen as well as glucose concentration on fermentation were observed.The OD 600 value could reach 98 when dissolved oxygen was controlled at 50% and glucose a…
Electrical aging of polyethylene was inhibited effectively by blending a kind of voltage stabilizer into it. Samples of polyethylene with and without the voltage stabilizer were electrically aged for various time, and then space charge distribution of these samples was measured under dc stress and being short circuite…
On-line partial discharge (PD) testing has been used for decades to help maintenance personnel detect stator winding insulation problems in motors and generators. Specifically, the test can often find loose, delaminated, overheated, and contaminated windings, well before these problems lead to failure. As a result, on…
La cinetique de la delignification et de la degradation de la cellulose pendant la cuisson kraft, kraft-AQ, polysulfure (PS), et kraft-polysulfure-AQ (PSAQ) de l'epinette noire a ete etudiee en termes d'indice Kappa et de viscosite de la pâte comme fonction du temps de cuisson et de la temperature. Les essais ont ete…
The properties of carbon black filled rubber compounds are greatly influenced by the extent of filler microdispersion. Dispersion takes place during mixing where carbon black pellets are broken up under shear forces into individual aggregates/ agglomerates and distributed throughout the polymer matrix. After the mixin…
A niche in the textile industry provides high strength, high modulus textile fabrics to the construction industry as a potential replacement for more traditional building materials such as wood, concrete, masonry, and steel. The mechanical properties of fabrics made of aramid, carbon and glass fibers lend themselves t…
The rate of copper dissolution in presence of phosphoric acid tert-butanol electropolishing mixtures was studied by measuring the limiting current which represents the rate of electropolishing. The rate of dissolution decreases by increasing phosphoric acid concentration, electrode height and the mole fraction of alco…
The present work is focused on the effects produced by hydrostatic pressure on Cu 2+ (<100 ppm) doped (C 2 H 5 NH 3 ) 2 CdCl 4 single crystal. The energy E u ( ~ ) of the e u ( ~ ) M b 1 g (∼ x 2 m y 2 ) charge-transfer transition of (C 2 H 5 NH 3 ) 2 CdCl 4 : Cu 2+ undergoes a red shift of 1400 cm m 1 on passing from…
Following the incident (through-wall crack and crazing zones) of May 1998 on the principal mixing zone of the residual heat removal system at CIVAUX nuclear plant, EDF has initiated a R&D programme to understand the incident and assess the risks of damage on other nuclear plant mixing zones. The programme includes…
This paper deals with the photoemission activity of radiation defects in crystalline and vitreous silica. Spectral and kinetic parameters and the concentration of defects in the surface layer and the bulk of the material were determined. Some features of the distribution of radiation-induced defects along the depth of…
We present the results of simulations using both atomistic and density functional theory (DFT) approaches that illustrate the uses of these techniques for investigating the structure and electronic structure of defects at the surfaces of oxides. Atomistic simulation studies of the low index surfaces of spinel (MgAl 2…