Materials Literature
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The electrochemical behavior of a Ni 51 Co 23 Cr 10 Mo 7 Fe 5.5 B 3.5 (weight percent) amorphous alloy ribbon has been investigated in alkaline solutions. When the metal is initially subjected to anodic potentials, an enriched Cr (and possibly B) surface layer is dissolved. Following this, a hydrous oxide film can be…
This paper is a description of the flocking process for roll goods and three-dimensional objects. Both mechanical and electrostatic flocking processes are explained and common flocking substrates, adhesives, and fibers arc evaluated. The paper also includes a description of how flocking fibers are manufactured includi…
The shape-memory effect is associated with a martensitic transformation in many materials. It consists in the ability of the material to recover its original shape after being deformed through or in the martensitic phase. This shape recovery occurs because the same parent phase is obtained after the retransformation.…
A calorimetric characterization of a second-order nematic (N)-smectic-${\mathit{A}}_{2}$ (Sm-${\mathit{A}}_{2}$) transition and a detailed heat-capacity study of a Sm-${\mathit{A}}_{2}$--Sm-${\mathit{C}}_{2}$ (smectic-${\mathit{C}}_{2}$) transition have been carried out on 4'-n-heptyloxy-carbonylphenyl-4'-(4''-cyanobe…
HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire H…
Work has been carried out with the objective of imparting the electronic/photonic property of extended Forster energy transfer into organized structures formed by the programmed self-assembly of synthetic nucleic acid units (fluorescent oligonucleotides and polynucleotides). Forster energy transfer is a non-radiative…
The title compound was prepared from sodium polyselenide and 12-crown-4 in DMF solution in the presence of cerium(III)chloride in the form of black needles. The crystal structure determination by X-ray diffraction shows a partially disordered structure, in which the anionic units Se 8 2- · Se 7 and Se 8 2- · Se 6 are…
Hole drift mobilities have been measured in films of solid solution of trans-1,2-bis(9H-carbazol-9-yl) cyclobutane (DCZB) in various host polymers; polymer liquid crystals (PLCs) and amorphous polymers. The hole drift mobilities were found to depend on the host polymers and be higher in PLCs. The larger mobilities of…
Identification of dimensional parameters of an arbitrarily shaped grating using scatter characteristics is presented. A rigorous diffraction model is used to predict the scatter from a known grating structure, and utilizing this information we perform the inverse problem of predicting line shape from a measurement of…
Tetragonal ZrO 2 particles have been added to superconducting YBa 2 Cu 3 O x (123) to improve its fracture toughness (K lC ). Reactions between the ZrO 2 and 123 prevented the ZrO 2 from providing significant toughening. A sol-gel coating of Y 2 BaCuO 5 (211) on the ZrO 2 particles minimized the deleterious reactions.…
A method to evaluate the force and particle velocity at the heated end of a rod subjected to impact loading is presented. The method is based on a characteristic impedance function determined by a set of parameters. With a given characteristic impedance function the force and particle velocity at the heated end can be…
An extensive investigation has been carried out on the compressive mechanical behaviour of type 224-carbon steel (0.18 wt % C, 1.21 wt % Mn) over the temperature range -110°C to +300°C and strain-rate 10-4 to 5000s-1, making possible the determination of the thermal sensitivity of this material. In several tests, a th…
Résumé: On sait que la contrainte d'écoulement de plusieurs métaux varie avec la vitesse de déformation de façon plus importante au-delà d'une certaine vitesse criti-que èc. Dans cet exposé une analyse des mesures antérieures sur le cuivre indique que la valeur de èc dépend fortement de la dimension…
Thirty-nine mutant tryptophan synthase alpha subunits have been purified and analyzed (in the presence of the beta 2-subunit) for their enzymatic (kcat, Km) behavior in the reactions catalyzed by the alpha 2.beta 2 complex, the fully constituted form of this enzyme. The mutant alpha subunits, obtained by in vitro rand…
Abstract A direct numerical simulation (DNS) code has been modified to investigate chemically reacting flows in a stationary, homogeneous turbulence. Single and multispecies reactions as well as complicated reaction schemes such as parallel/consecutive reactions are studied. The effects of some parameters are discusse…
Abstract Poly[(4‐ N ‐ethylene‐ N ‐ethylamino)‐α‐cyanocinnamate] was prepared by solution esterification of (4‐ N ‐ethyl‐ N ‐(2‐hydroxyethyl) amino)‐α‐Cyanocinnamic acid and by melt transesterification of ethyl (4‐ N ‐ethyl‐ N ‐(2‐hydroxyethyl) amino)‐α‐cyanocinnamate. The melt transesterification generally yielded pol…
We describe an integral approach to the rigorous solution of Maxwell's equations for diffraction from a biperiodic grating having arbitrary profile and periodicity. Emphasis is placed on the implementation of solutions and is addressed to the engineering community. The method described is amenable to mathematical conv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTermination by reductive elimination in the polyetherification of bis(aryl chlorides) activated by carbonyl groups, with bisphenolatesV. Percec, R. S. Clough, P. L. Rinaldi, and V. E. LitmanCite this: Macromolecules 1991, 24, 21, 5889–5892Publication Date (Print):October 1,…
An investigation of the stress-strain response as a function of strain rate, spall strength, and dynamic fracture behavior of pure W, W-26Re, W-Ni-Fe and W-Ni-Fe-Co has been performed. Spall strength measurements, obtained in symmetric-impact tests, showed an increase in spall strength from 0.4 GPa for pure tungsten t…
In this paper we report the luminescence studies of octahedrally coordinated Cr3+ ions in a natural sample of kyanite (Al2O3:SiO2). The chromium ion can substitute for any one of the four nearly octahedral Al sites with the average metal-ligand distance of about 1.91 Å. Using absorption, excitation and emission spectr…