Materials Literature
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The adsorption of the different species X and CX 3 on an X-terminated diamond (111) surface (X = H, F, Cl, Br) has been investigated structurally and energetically, using a cluster approach and two different types of quantum mechanical methods: the ab initio molecular orbital (MO) method and the first-principle densit…
A series of four "mixed" bis(thiosemicarbazone) keto aldehyde derivatives containing dissimilar thiosemicarbazone functions were synthesized and evaluated as ligands for preparation of radiocopper-labeled radiopharmaceuticals. The pyruvaldehyde-based mixed bis(thiosemicarbazone) ligands CH3C[=NNHC(S)NH2]CH[=NNHC(S)NHM…
The initial events (virus adsorption and fusion with the cells) in the replicative cycle of human immunodeficiency virus (HIV) can serve as targets for the antiviral action of metal-binding compounds such as polyanionic compounds (polysulfates, polysulfonates, polycarboxylates, polyoxometalates, and sulfonated or carb…
This paper presents an approach for obtaining science-based answers to practical vacuum device problems. The question "How to translate scientific knowledge to design and operation practice" is rephrased to the more productive question "What research activities are required to provide science-based answers to practica…
BrNO 2 is produced by the heterogeneous reaction of ClNO 2, highly diluted in He, with an aqueous bromide solution and subsequent trapping at −155 °C. The crude product is purified by trap to trap condensation and fractional sublimation in vacuo. At 300 K and a pressure of 1 mbar, a half-life of about 1 h is observed.…
Les essais d'entartrage réels sont toujours longs à mettre en œuvre. Aussi a-t-on mis au point des essais d'entartrage accélérés. Cependant les diverses méthodes utilisées, électrochimiques ou autres, ne sont pas toujours représentatives des phénomènes réels d'entartrage. Leur principal inconvénient est un manque de s…
A neural network to implement a hysteresis model for a magnetic material within a finite element program is described. It is shown that such a system can match the results produced by a Preisach model but the time overhead can be considerably reduced thus making feasible the solution of large problems involving hyster…
One factor responsible for the enhanced thermal stability of S-nitroso-N-acetylpenicillamine (SNAP), compared with S-nitroso-N-acetylcysteine (SNAC), has been shown, by ab initio calculations on model compounds, to be steric interactions in the dimerisation reaction leading to disulfide formation. Studies using DSC an…
A vector hysteresis model is experimentally tested for two soft magnetic materials in the two-dimensional case. The model expresses net magnetization as a sum of contributions from a number of pseudoparticles, each one having a dry friction-like hysteresis mechanism. Five adjustable parameters are used to represent hy…
The paper reports an experimental low-temperature study of the temperature-dependent behavior of the lattice constants, heat capacity, and thermal conductivity of the AlN ceramic. The results obtained are compared with the data available for the high-temperature region. The thermal expansion coefficient is found to be…
Quantum chemical calculations using the density functional theory were performed to model the mechanism of selective catalytic reduction of NO by NH3 on a supported vanadium oxide monolayer. In the first step, the adsorption of NH3 on a bimetallic cluster representative of vanadium oxide, containing a terminal V(DOUBL…
A twisted semi-hard magnetic wire of Vicalloy with composition of Fe/sub 41/Co/sub 48/V/sub 11/ revealed remarkable uniaxial magnetic anisotropy along central axis direction of the wire and showed a difference in coercivity between outer shell and inner core of the wire. Also the wire remained the large torsion stress…
Transgenic suspension cultures of Black Mexican Sweet maize (Zea mays L.) expressing the Alcaligenes eutrophus genes encoding enzymes of the pathway for biosynthesis of the biodegradable polymer poly(beta-hydroxybutyrate) (PHB) were established as a tool for investigating metabolic regulation of the PHB pathway in pla…
Abstract The hybrid donor between bis(ethylenedithio)tetrathiafulvalene and -tetraselenafulvalene (ET and BETS, respectively) has been synthesized and the electrical properties together with the crystal structures of its cation radical salts investigated. All of the crystals studied by X-ray structural analysis turned…
Nickel-Titanium alloys with stoichiometric single phase and non-stoichiometric dual phase structures of NiTi and NiTi+Ni3Ti are produced through high speed induction melting and combustion synthesis of pure Ti/Ni elements. Both alloys are homogenized at 1273 K for two hours, rolled into thin strips of 0.3 mm thickness…
We consider the adsorption of mutiblock copolymers made of a regular succession of 2 N consecutive sequences of Z monomers of alternating species A and B, respectively. These eventually adsorb at the interface between two immiscible, good but selective solvents for the different species. We consider the various surfac…
Self-assembled monolayers (SAMs) were formed from ω-substituted alkanethiols, namely (1-mercaptoundec-11-yl)hexa(ethylene glycol) (HS(CH 2 ) 11 (OCH 2 CH 2 ) 6 OH) and 1-dodecanethiol (HS(CH 2 ) 11 CH 3 ), on the surface of planar gold films and on colloidal gold particles. A quantitative method for studying the physi…
Ruthenium(II) complex salts trans-[Ru(NH 3 ) 4 (L D )- (L A )][PF 6 ] 3 (L D = an N-donor ligand, L A = a 4,4′-bipyridinium ligand) exhibit large, tunable static first hyperpolarizabilities β 0 which are associated with intense, visible metal-to-ligand charge-transfer excitations.
Silsesquioxanes are a unique class of three-dimensional polyhedral silicon oligomers that have progressively begun to occupy a sizeable niche in polymer chemistry. This review focuses on the methods required to synthesize potentially useful silsesquioxanes, and takes a brief look at their applications as silicon-based…
SummaryConsiderable efforts are being made to improve the corrosion resistance of zinc coatings by alloying and application of compatible conversion coating treatments. These new systems have the potential for reliable and cost effective protective coatings on steel used in construction applications.The present invest…