Materials Literature
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The localized concentration of energy during a single bubble collapse is manifested in two forms, which are the emission of an acoustic pulse, and the emission of a light pulse. Through precise control of experimental parameters, one can levitate a single bubble in a standing wave field and measure the magnitude of th…
A wealth of literature in research at molecular levels concern ing the transition metals, e.g., Cu- and Mo-containing compounds, has been intensively documented for flame retardance, particularly smoke suppres sion, of PVC. An attempt has been made in this article aimed at performing a cone calorimetric analysis in ai…
Selected divalent cations were surveyed to examine their suitability as a co-dopant in Cr : Y3Al5O12 for the promotion of Cr4+. The only successful co-dopants were Ca and Mg. The following co-dopants failed to generate Cr4+ in significant concentrations: Co, Cu, Fe, Mn, Zn, Sr. The lack of success in the transition me…
N, N‘ -Bis[(3-carboxynorbornadien-2-yl)carbonyl]methylenedianiline (BNMA) was synthesized in 87 % yield by the reaction of 2,5-norbornadiene-2,3-dicarboxylic acid anhydride with 4,4‘-methylenedianiline. Other dicarboxylic acid derivatives containing norbornadiene (NBD) residues were also prepared by the reaction of 2,…
Abstract Chitosan/calcium‐alginate beads were prepared by a coacervation method in aqueous medium. Their swelling properties and morphologies were studied. Complexed beads with a mean diameter of 500 μm were obtained by dropwise addition of a sodium alginate solution into a chitosan‐calcium chloride solution. From sca…
The use of surface-enhanced Raman scattering (SERS) as an analytical technique continues to grow, but questions about its viability remain. This paper addresses the concern about the long-term stability of the surfaces used with the SERS technique. We have studied the long-term stability of Ag surfaces coated with thr…
Wood-fiber thermoplastic composites were prepared with polypropylene (PP) and high-density polyethylene (HDPE) matrix resins employing high shear thermokinetic compounding for fiber dispersion. Wood fibers obtained from recycled newspapers were mixed with the matrix polymers at a level of 30% by weight. In one experim…
Structure and Bonding at NiFATAL ERROR -- Missing abstract.ndash;ZrO 2 (Cubic) Interfaces Formed by the Reduction of a NiOFATAL ERROR -- Missing abstract.ndash;ZrO 2 (Cubic) Composite
Abstract— The fracture behaviour of borosilicate glass reinforced by molybdenum and/or vanadium particles has been investigated. For the addition of 5 vol% molybdenum particles, two processing procedures have been tested and the influence of volume fraction of vanadium particles (in the range 2 to 30 vol%) on fracture…
Abstract The purpose of this study was to accumulate material data for use in a simulation of morphology and crystallization in quenched slabs of isotactic polypropylenes (i‐PP's). The molecular weight effect on the crystallization kinetics of various i‐PP's were studied using isothermal and nonisothermal experiments.…
ABSTRACT Zein fibers were successfully prepared by a wet‐spinning technique from a zein suspension formulated with 15% zein, 60% water, 22% 0.4 N sodium hydroxide, and 3% urea by weight. Tenacities were measured with an Instron machine, and flexibility was determined by noting the smallest diameter rod around which a…
Direct proof of intermolecular compositional inhomogeneity of a metallocene polyethylene copolymer has been obtained using a cross-fractionation (CF) technique. The ethylene/1-hexene copolymer sample was synthesized using a Zr-based homogeneous metallocene catalyst. A solvent gradient fractionation (SGF) applied to th…
This paper presents characteristics of a permanent magnet linear synchronous motor (PMLSM) considering lateral leakage flux and lateral displacement. In order to analyze the PMLSM with large air gap and finite width, a new three dimensional equivalent magnetic circuit network method (3D EMC) is introduced, which suppl…
A plastic columnar discotic phase is reported for several triphenylene derivatives. It is characterized by a three-dimensional positional order of the molecules, as in a crystalline state, while maintaining the rotational mobility of the molecules. Only very minute changes in structure and dynamics occur at the phase…
Electron irradiation damage of highly graphitized carbon fibre was examined by means of transmission electron microscopy in a multibeam lattice imaging mode together with selected-area electron diffraction. It was found that the (00.2) lattice spacing was homogeneously increased up to about 11% over the whole irradiat…
Modelle zum Umsatz der organischen Bodensubstanz (OBS) werden seit langer Zeit entwickelt. Die Ergebnisse aus Dauerversuchen zeigen, daß mindestens zwei OBS Fraktionen (inert und umsetzbar) existieren. Weitergehende Untersuchungen führten zur Definition einer aktiven und einer stabilisierten Fraktion innerhalb der ums…
The Monte Carlo simulation technique has been used to study the anomalous conductivity of aliovalently doped fluorite-related oxides. In order to investigate the effect of the interaction between the dopants and the oxygen vacancies on the transport behavior, three simple model interactions have been tested: Nearest-n…
Aniline oligomers have been intensively studied in the past years. In particular, aniline oligomers substituted with electron-donor groups have been synthesized and its electronic properties calculated. However, when an electron-acceptor group is attached to the benzenoid ring of the oligoaniline, strong effects over…
The smectic-A phase of octylcyanobiphenyl (8CB) doped with a photosensitive azo-compound has been reported to exhibit structural changes and formation of periodic layers distortions upon exposure to low-level radiation. It is caused by changes in the smectic layer spacing triggered by light-induced molecular photoisom…
Single crystal preparations of the Pb[(Sc 1/2 Nb 1/2 ) 1- X Ti X ]O 3 binary system have been investigated by a flux method using 75 mol%PbO-25 mol%B 2 O 3 flux. The crystals were grown in a platinum crucible by mass crystallization, achieved by slow-cooling the solution at 1° C/h from 1,200° C to 880° C. The resultin…