Now showing items 51-60 of 76
Synthesis of the optically active [alpha]-nucleic acid base substituted propanoic acids
(Elsevier, 1989)
The (R)-2-(adenin-9-yl)propanoic acid was prepared from adenine and (S)-ethyl lactate by using the triphenyl phosphine-diethyl azodicarboxylate system. The (R)-2-(thymin-1-yl)-propanoic acid, (R)-2-(cytosin-1-yl)propanoic ...
Molecules with high rotational angular momentum: a generalized ab initio approach
(Elsevier, 1989-09)
An outline is given of a systematic and automated computational procedure based upon our successful ab initio approach to the theoretical study of centrifugal distortions of rotating molecules and their associated energy ...
The effect of ion beam surface modifications on fatigue crack initiation in polycrystalline nickel
(Elsevier, 1989-08-01)
Flexural fatigue tests at surface strain amplitudes of +/-0.0012 were conducted on polycrystalline nickel to determine the effect of ion beam surface modifications of the Ni/Al system on fatigue crack initiation. An ...
Segregation measures for diffusion-controlled A+B reactions
(Elsevier, 1989-11-24)
New measures of segregation are defined and calculated for the A + B-->0 reaction on one-dimensional and fractal lattices (Sierpinski carpet and gasket). We differentiate between local and global segregation parameters. ...
Factors Influencing the Mode I Interlaminar Fracture Toughness of a Rubber Toughened Thermoplastic Matrix Composite
(Sage Publications, 1989)
The use of a rubber modified thermoplastic resin has been investigated as a method to improve the Mode I interlaminar fracture toughness of a unidirectional con tinuous carbon fiber composite Test results show that the ...
Solid state synthesis and characterization of model hydrodesulfurization catalysts
(Elsevier, 1989-10)
Solid-state reactions of elemental sulfur with metallic cobalt and molybdenum powders were used to synthesize model catalysts for hydrodesulfurization (HDS). The resulting materials had a general stoichiometry of Co2xMo1-xS2 ...
Preparation and activity of solid-state hydrodesulfurization catalysts
(Elsevier, 1989-12)
Microstructure and reactivity of supported bimetallic platinum-gold catalysts
(Elsevier, 1989-12)
In this paper an attempt is made to correlate the microstructure of a supported bimetallic catalyst system with its activity and selectivity. A series of bimetallic platinum-gold catalysts supported on high-surface-area ...
Model hydrodesulfurization catalysts: Solid state synthesis and characterization of iron containing molybdenum sulphide
(Elsevier, 1989)
Model catalysts for hydrodesulfurization were synthesized via solid state reactions of elemental sulfur with metallic iron and molybdenum powders. The starting materials had a general stoichiometry of Fe2[alpha]Mo1-[alpha]S2 ...
Vibrational spectra and structure of the heptahydrodiborate ion, [B2H7]- in glycol ethers
(Elsevier, 1989)
The i.r. and Raman spectra of the heptahydroborate ion, [B2H7]-, and its deuterated derivative, [B2D7]-, have been obtained in solution and assignments have been made of the observed bands. The data are interpreted as ...