Materials Literature
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Fluorinated amorphous carbon thin films ( a -C:F) for use as low-dielectric-constant interlayer dielectrics are deposited by helicon-wave plasma-enhanced chemical vapor deposition using fluorocarbon compounds as a source material. The a -C:F films can be grown from C 4 F 8 at a high deposition rate (above 400 nm/min)…
A quantitatively correct theory of the simulation of electron micrographs is proposed which considers the partially coherent process of image formation within the electron microscope. The new approach is based on the propagation of the mutual coherence function of the partially coherent electron wave field. Our method…
Blends of poly(3-hydroxybutyrate) (PHB) and ethyl cellulose (EtC) were prepared by compression molding of solution cast films. The two components were not miscible but the blends showed ‘mechanical compatibility’. Two PHB/EtC blends (80/20 and 50/50 (w/w in all cases)) were selected for biodegradation experiments in a…
Hyphomonas strain MHS-3, a member of a genus of primary colonizers of surfaces immersed in marine water, synthesizes two structures that mediate adhesion to solid substrata, namely, capsular exopolysaccharide and fimbriae. Specific stains, gold-labelled lectins, and monoclonal antibodies, along with transmission elect…
An AUTODYN 2D (version 3.0), PC-compatible hydrocode utilizing Lagrangian and Eulerian processors (the latter including a fracture criterion) with a Johnson-Cook constitutive relationship has been applied to simulating experimentally developed impact craters in 1.3 cm thick OFHC copper targets for 1100 aluminium spher…
Pervanadate and permolybdate are irreversible protein-tyrosine phosphatase inhibitors, with IC50 values of 0.3 and 20 microM, respectively, in intact cells. Maximal inhibition was obtained within 1 min at higher concentrations of the compounds. They induced prominent changes in the phosphorylation status of the gap ju…
Several commercial FCC equilibrium catalyst (ECAT) samples were examined by X-ray photoelectron spectroscopy (XPS) in an effort to characterize the nickel contaminants. It was found that the majority of the nickel was present as NiAl 2 O 4 or Ni 2 SiO 4 (cannot differentiate with XPS), with a small percentage as NiO.…
Abstract Interactions with bentonite are important in the chemical speciation and fate of heavy metals in soils and other ecosystems. The interactions of Zn with bentonite were studied using X-ray diffraction (XRD), dehydration, kinetic and sequential extraction procedures. The species and activity of Zn retained by b…
Abstract A peralkaline nephelinite lava ([Na+K]/Al 2.15) from the active carbonatite volcano Oldoinyo Lengai, contains combeite, Ba lamprophyllite, a phase with affinities to delhayelite, CeSrNb perovskite, a CaNa phosphate high in Sr, Ba and K, and peralkaline glass; in addition to Fe-rich nepheline, aegirine-rich cl…
Abstract The reaction mechanism of ethylene‐propylene‐diene (EPDM) peroxide vulcanization, in the presence of triallylcyanurate (TAC), as a coagent, was studied by IR spectroscopy and equilibrium swelling technique. Coagent TAC is added in EPDM polymer to prevent the scission of polymer chains during the curing proces…
In an attempt to determine the magnitude of the effects of a number of core production attributes; such as core quality, joint stacking, clamping pressure, etc. on the performance of stacked cores, a comprehensive experimental and analytical study has been conducted. These effects were studied for different core mater…
The polymerization of a commercial polyester resin was investigated by differential scanning calorimetry (DSC). The conversion profiles were obtained in the temperature range 60–80°C. The autocatalytic model satisfactorily describes the experimental data. Fourier transform infrared spectroscopy (FTIR) measurements wer…
Shape memory alloy (SMA) has been considered as an actuator for applications that require large force and displacement. Two factors have hampered the usefulness of such actuators: a hysteretic input-output relation and bandwidth limitations. This paper considers the hysteresis phenomenon from a control point of view.…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBinuclear Complexes as Models for Adjacent-Metal Involvement in C−H Bond-Cleavage and C−C Bond-Formation Steps Relevant to Fischer−Tropsch ChemistryJeffrey R. Torkelson, Robert McDonald, and Martin CowieView Author Information Department of Chemistry, University of Alb…
High temperature flow stress data obtained from laboratory scale isothermal forging tests on two titanium alloys, IMI550 (Ti-4Al-4Mo-2Sn-0.5Si) and Ti-10V-2Fe-3Al, have been correlated using a generalised hot working equation. The (α + β) titanium alloy IMI 550 was studied at temperatures in the range 900–950°C, high…
The structural elucidation of 24 xanthones with different substitution patterns was performed by spectroscopic methods, namely 2D NMR techniques, such as correlation spectroscopy (COSY), nuclear Overhauser effect (NOE), heteronuclear correlation (HETCOR) and a 1D NMR technique, selective insensitive nuclei enhanced by…
New comb-shaped LC copolymers based on phenyl benzoate and menthyl-containing monomers were synthesized. Phase behaviour, optical properties and structure of the synthesized copolymers with different compositions were studied. Specific features of the development of helical nematic and smectic mesophases (N*, NB*, Ncy…
Abstract Chrisstanleyite, Ag 2 Pd 3 Se 4 , is a new mineral from gold-bearing carbonate veins in Middle Devonian limestones at Hope's Nose, Torquay, Devon, England. It is associated with palladian and argentian gold, fischesserite, clausthalite, eucairite, tiemannite, umangite, a Pd arsenide-antimonide (possibly merti…
Room-temperature Raman-scattering spectra are reported for the type-II superconductors ${\mathrm{M}}_{x}{\mathrm{Ba}}_{y}{\mathrm{Si}}_{46}$ (M=Na,K) that were recently shown to exhibit ${T}_{c}$'s \ensuremath{\sim}3.5 K. These spectra are compared to those of ${\mathrm{Na}}_{8}{\mathrm{Si}}_{46}$ and ${\mathrm{K}}_{7…
The thermal conductivity of thin e lms (0.01 ‐ 100 mm) governs the heat transfer characteristics and affects the performance and reliability of the microelectronic devices in which they are used. To measure the thermal conductivity of these e lms, several different steady-state and transient techniques have been devel…