Materials Literature
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Etude, par spectroscopie RMN de 29 Si et 27 Al dans le systeme CaO-Al 2 O 3 -SiO 2 , d'une serie de 50 verres environ dont les compositions chimiques variaient systematiquement le long de sept lignes selectionnees du diagramme de composition ternaire. Les donnees sont discutees d'apres un modele de structure base sur…
Composites of Al 2 O 3 and Y 2 O 3 partially‐stabilized ZrO 2 were isostatically hot‐pressed using submicrometer powders as the starting material. The addition of Al 2 O 3 resulted in a large increase in bending strength. The average bending strength for a composite containing 20 wt% Al 2 O 3 was 2400 MPa, and its fra…
Two hexa-alkoxy derivatives (7a and 7b) of terephthal-bis-[4-benzoyloxyaniline] are described. They exhibit two new types of mesophase for which the term phasmidic is proposed : one has an hexagonal 2D lattice and the second an oblique 2D lattice.
abstract Carbonate concretions occur commonly in organic-rich clastic sediments of ancient coastal floodplains and deltas. They consist of calcite, dolomite, or siderite or combinations of these. The influence of marine, mixed or non-marine depositional waters is seen in early cements; solute sources from decompositio…
On a procédé à l'examen des données existantes sur la composition chimique et les propriétés structurales de columbite-tantalite, ferrotapiolite-manganotapiolite, ixiolite, wodginite, rutile tantalifère et niobifère, cassitérite niobo-tantalifère, et du groupe de pyrochlore. La compréhension de la cristallochimie de c…
Materials transparent to infrared radiation are becoming more and more important with the increasing sophistication and exacting requirements of their diverse applications. Although books have appeared on different aspects of this subject, Dr Savage is the first to collect all the relevant topics in one volume. His wo…
Very comprehensive text for physiology (algae) and/or limnology (freshwater biology) courses at the junior/senior/grad level.
The yield of hydrogen peroxide in the sonication of argon-saturated water was studied in the presence of various solutes. The efficiency of OH radical scavenging is expressed by the reciprocal value of C 1/2, the solute concentration at which the H2O2 yield is decreased by 50 per cent. C 1/2 ranges over several orders…
Polylactide (PLA) microcapsules with an average diameter of 1.5μm were prepared by an interfacial deposition technique. The degree of degradation of PLA microcapsules was estimated by determination of the amount of lactic acid as a final product in bulk solution and from the molecular weight distribution of PLA of the…
The gene encoding subtilisin Carlsberg from Bacillus licheniformis has been isolated by molecular cloning using a mixture of synthetic oligonucleotides. The entire nucleotide sequence of the coding sequence as well as 5' and 3' flanking sequences have been determined. The deduced amino acid sequence reveals an N-termi…
A survey is given of magnetic excitations in metallic 4f systems when the crystal-field splitting is comparable to or larger than the magnetic interaction between different sites. Particular emphasis is put on the interaction of crystal-field split rare-earth ions with conduction electrons. A number of physical effect…
We present results for the splay and bend constants, K11 and K33, in two homologous series of nematic compounds, the alkyl- and alkoxy-cyanobiphenyls, and in PAA. They have been obtained in two laboratories using different methods, and the extent to which they agree gives confidence that neither set is significantly a…
Stoichiometric mullite powder (3Al 2 O 3 ·2SiO 2 ) prepared by spray pyrolysis and sintered at 1650°C attained 95% of theoretical density. The flexural strength was 360 MPa at room temperature and decreased slightly at 1400°C. A fairly high K Ic value (2.8 MN/m 3/2 ) was obtained. These mechanical properties can be at…
Following the discovery of a first-order phase transition in annealed KOH-doped ice at 72 K, which was identified as the order–disorder transition associated with the proton positions, a structural study has now been made. Powder neutron diffraction measurements on KOD-doped D2O above and below the phase transition, t…
A systematic study is presented of the effects of silicon dopant type, resistivity, current density, and hydrofluoric acid concentration on the formation and properties of porous silicon. Cross-section transmission electron microscopy revealed the presence of two distinct microstructures. The structure formed is deter…
"Hydrogen embrittlement and stress corrosion cracking." British Corrosion Journal, 20(4), p. 158
This monograph presents a comprehensive and critical review of the 1074 published work on self-diffusion and chemical diffusion in oxide glasses. Where possible, the results on glasses are compared with those of the corresponding crystalline phases. Other ionic transport processes were also described, like electrical…
Abstract A new technique of decoration of the fold surface of polymer crystals is described. It is similar in methodology to gold decoration, but makes use of vapors of crystallizable polymers, principally polyethylene, as decorating material. Upon condensation and crystallization, the highly anisometric decorating mo…
This is the most comprehensive collection of data on the kinetics of crystallization from solution. This feature alone makes it a valuable addition to the literature on industrial crystallization. It provides a link between crystallization mechanisms and crystallization kinetics. The authors have put much effort into…
The transgranular stress-corrosion cracking of ductile alloys (and at least one pure metal) leads to a fracture appearance characteristic of cleavage. The experimental and theoretical background of this form of metal failure is reviewed. The discontinuous nature of crack growth in α-brass and copper is demonstrated us…