Materials Literature
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By using high conductivity carbon fibers in a graphitizable carbon matrix, very high values for the thermal conductivity of a composite can be obtained in the direction parallel to the fibers. The carbon matrix of this material exhibits anisotropy and is oriented in the direction of the fibers. Thermal conductivity of…
Bacterial and fungal strains were isolated from enrichment cultures using diethylphthalate, diethylterephthalate, or ethylene glycol dibenzoate as sole carbon sources.Aureobacterium, Flavobacterium, andMicrococcus species were isolated from diethylphthalate enrichments;Rhodococcus andXanthomonas species were isolated…
The miscibility of pectin (P), starch (S), and glycerol (G) in films was investigated by dynamic mechanical analysis (DMA), tensile measurements, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and film dissolution studies. DMA revealed that P/S/G films exhibit up to three thermody…
The atmospheric corrosion of zinc in the presence of particles has been investigated at 300 and 373 K in air‐water vapor mixtures. The development of corrosion products was followed by several in situ techniques, including Fourier transform infrared spectroscopy, x‐ray diffraction, pH measurements, and scanning Kelvin…
The occurrence of ester-interchange reactions during PET/PBT blend processing has been confirmed by 13C-NMR measurements. The limitations of the method for precise quantification of the extent of reaction between high molecular weight polyester blends have also been pointed out. Titanium alkoxide has been confirmed as…
Nanotube formation is not limited to carbon , and in fact seems to be a general feature of layered materials. The classes of new nanotubes that have been synthesized, e.g., boron‐nitride‐containing compounds and transition‐metal dichalcogenides, are briefly reviewed. Theoretical predictions, such as the type II BC 2 N…
A continuous culture system that allows bacteria to be grown in steady-state populations under pressures of up to 700 atm (71 MPa) was constructed and tested. With readily available or slightly modified high-pressure chromatography equipment, a continuous flow of sterile medium is pressurized and passed through a 500-…
A conducting polymer-based chemical sensor was fabricated by depositing a film containing polyaniline blended with polyethylene oxide and doped with copper chloride onto interdigitated electrodes in a surface cell configuration. It was found to be very sensitive to alcoholic vapours, especially methanol. Its character…
Abstract The preparation and characterization of praseodymium(III) and neodymium(III) complexes of heptadentate (N4O3) ligand trensal, tris[2-(salicylideneamino)ethyl]amine (H3L1), have been studied. These complexes (PrL1 and NdL1) were prepared by the reaction of the praseodymium(III) or neodymium(III) complex of 1,9…
We have studied the translational and rotational motion of a sphere in a viscous Lennard-Jones liquid using molecular dynamics simulations. The drag and torque on a sphere in an effectively unbounded fluid are found to agree with continuum hydrodynamics results even when the size of the sphere is comparable to that of…
We have constructed a molecular beam mass spectrometer designed specifically to sample gases from a diamond chemical vapor deposition (CVD) process chamber thereby enabling characterization of the gas-phase CVD environment. With this in situ diagnostic technique we have obtained quantitative measurements of the compos…
A comparison is made of various ab initio methods, including density functional methods for the 3Σ+ and 1Σ+ states of TiC. The calculated properties are sensitive to the level of theory. The results with the LSDA and BPW91 density functional methods are in poor agreement with higher level calculations obtained at the…
The effect of UV-B on the occurrence of DNA damage and consequences for the cell cycle were studied in the marine diatom Cyclotella sp. DNA damage was quantified by immunofluorescent detection of thymine dimers in nuclear DNA of single cells using flow cytometry. A total UV-B dose (biologically effective dose BE(DNA30…
Ferrochelatase is a mitochondrial inner membrane-bound enzyme that catalyzes the insertion of ferrous iron into protoporphyrin, the terminal step in protoheme biosynthesis. The functional/structural roles of 10 invariant amino acid residues were investigated by site-directed mutagenesis in the yeast Saccharomyces cere…
A previously proposed stress corrosion cracking (SCC) mechanism incorporating localized surface plasticity (LSP), crack initiation, and crack-tip embrittlement by anodic dissolution at film rupture sites is reviewed, together with new information supporting the mechanism. Externally imposed anodic dissolution currents…
This paper presents a complete FE formulation for the calculation of 3D nonlinear eddy current fields with ferromagnetic moving conductors. The formulation is realized by using the A/spl I.oarr/, V-A/spl I.oarr/ formulation in combination with the Coulomb gauge. To consider nonrectangular shapes of geometries tetrahed…
The self-diffusion of water in the nematic micellar phase of the cesium pentadecafluorooctanoate-water system has been studied by means of the $^{2}\mathrm{H}$ pulsed gradient spin echo NMR technique. The principal components of the macroscopic diffusion tensor were determined to high accuracy as functions of temperat…
Abstract Core observation, X-radiography, and scanning electron microanalysis of distinctly laminated, indistinctly laminated, and nonlaminated sediments from ODP Site 893 show that laminated as well as nonlaminated (i.e., massive) hemipelagic sediments can form in the absence of bioturbation. This view contrasts with…
This paper is a review of optical ordering processes in amorphous films containing photoisomerizable dye molecules. Photoinduced Anisotropy (PIA), Photoassisted Poling (PAP) and All-Optical Poling (AOP) are demonstrated through basic experiments and interpreted by a common theoretical model.
The homopolymerization of maleic anhydride was attempted at 190°C, during the melt-functionalization of polypropylene, either with or without organic peroxide using a Brabender plastograph. The free radical homopolymerization of pure maleic anhydride was also attempted either with or without organic peroxide, at 190°C…