Materials Literature
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Abstract Auger electron spectroscopy measurements have been performed on silicon nitride layers exposed to air. The layers were deposited on Si(100) wafers kept at 300°C or 600°C by excimer laser ablation of a silicon target under various ammonia pressures. The Si LVV, O KLL and N KLL lineshapes of silicon nitride lay…
Abstract A useful instrument for polymer film preparation by solution casting was employed in this study. It enabled us to control the solvent evaporation rate of the polymer solution. By using this instrument, the aggregation of hard segments in segmented poly(urethane‐urea) (SPUU) was investigated. SPUU was prepared…
This paper describes a novel rapid consolidation technique called Dynamic Magnetic Compaction (DMC) for consolidating advanced material powders. DMC utilizes pressures generated from pulsed electromagnetic fields to form net shape parts. The consolidation occurs rapidly in less than a millisecond via pressure wave pro…
Synthetic approaches for the preparation of macromolecular conjugates of the antifibrotic agent cis-4-hydroxy-L-proline (cHyp) were explored, and the efficacy of the conjugates in inhibiting collagen accumulation was investigated in vitro and in vivo. In one approach, poly(PEG-Lys), an alternating copolymer of poly(et…
A fusion enzyme consisting of UDP-galactose 4-epimerase and galactose-1-P uridylyltransferase with an intervening Ala3 linker was constructed by in-frame fusion of E. coli gene galT to the 3'-terminus of the E. coli gene galE that had been extended with the coding sequence for three alanine residues, all contained wit…
Tritium concentration measurements have been made of the tritium recovery from the JT-60U after high power neutral beam injected discharges. This work has been done to study tritium release characteristics and to assess the tritium inventory in the vacuum vessel. Cleanup operations by hydrogen divertor discharges and…
Fascicle II of the Americanarum Diatomarum Exsiccata is comprised of 52 diatom slides from 34 lakes, ponds, and streams located on Ellesmere Island in the Canadian High Arctic. This exsiccata has been distributed to 16 museums and collections around the world. Diatom slides were prepared from sediments, mosses, and pl…
Sintered densities of β‐silicon carbide compacts were observed to decrease as the thickness of the compact increased. The chemistry and density gradients of these compacts were analyzed, as well as the weight loss and the CO evolution during sintering. The sintering cycle was altered to include a vacuum hold between t…
Abstract The prepaparation of amorphous, homogeneous blends of zwitterionic polymers and transition metal salts was investigated. Homogeneous miscibility was achieved in many cases up to equimolar amounts of salt, depending on the anion and cation chosen. Various analytical techniques point to a solid state solution o…
The “supercell” scheme is applied to the study of local defects in MgO (Ca substitution, cation and anion vacancies) and bulk silicon (carbon substitution). The trend of the quantities of interest (defect formation energy, geometrical relaxation, charge distribution around the defect) as a function of the supercell si…
The magnetoelectricity of the boracite Cr3B7O13Cl has been studied by quasistatic and dynamic magnetoelectric (ME) H measurements on (001)cub platelets with a ferroelastic/ferroelectric single domain state, obtained by poling with an electric field of E = 45 kV·cm−1, applied upon cooling through the 42ml′ ⇒ mm21′ phas…
The plasticizer, n-butylbenzenesulfonamide (NBBS), is reported to be neurotoxic when inoculated intracisternally or intraperitoneally into rabbits. Because NBBS is commonly used in the production of polyamide (nylon) plastics and is soluble in water, the disposal of NBBS-containing plastics in landfill sites could res…
The diffusion of oxygen in commercially available aluminum nitride substrates has been studied by performing interdiffusion‐type experiments. The diffusion of oxygen both within AlN grains and along grain boundaries was investigated. By using as‐received AlN substrates and an electron microprobe as an analytical tool,…
Abstract An alcohol utilizing Alcaligenes eutrophus NCIMB 12080 produced a copolymer, poly‐(hydroxybutyrate–valerate) (PHBV), in a computer‐controlled 7‐L fed‐batch fermentor when the alcohol feed contained pentanol. Pentanol as a sole carbon source was not efficient either for cell growth or for PHBV production. To a…
Our previous work has demonstrated a relationship between polarity index and organic carbon referenced partition coefficients (K oc ) of organic chemicals. Here we compare sorption of benzene, toluene, or o-xylene by protein with non-protein organic sorbents. K oc for benzene, toluene, or o-xylene sorption by collagen…
A thermogravimetric study of the oxygen activity dependent variation of the oxygen content in CaO-doped zirconia has been performed at different dopant concentrations within the stability limit of the tetragonal solid solution at temperatures between 1200 and 1300°C. The experimental results are compatible with a simp…
A transfer-matrix method is used to study cylindrical-wave reflection at cylindrical media interfaces. We find that the reflection can be total at an interface of small radius but is only partial if the radius is large. This feature is useful for designing optical sources and receivers of small radii. Cylindrical-wave…
Abstract The fabrication and electrochemical characterization of a variety of self‐supported thermorevrsible organic electrolyte gels prepared using l,3:2,4‐dibenzylidene sorbitol (DBS) as a gelling agent are reported. Impedance analysis and cyclic voltammetry were used to examine these gel systems, which exhibit ioni…
Abstract New dilactone-type fluorescent dyes have been synthesized starting from 1,4-naphthoquinone and m-(dialkylamino)phenols. Both the fluorescence maxima and intensities of the dyes were drastically changed depending on solvent polarity. The dyes also showed good fluorescent dichroic properties in an ordered nemat…
The real and imaginary parts of the refractive index have been obtained in a wide energy range (0.5-12 eV) for films (0.2-0.3 µm thick) of amorphous carbon with different hydrogen contents (0-40 at. %) to obtain more insight into the electronic structure of these materials. Reflectance and transmittance measurements h…