Materials Literature
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A statistically based Plackett-Burman screening design identified milk whey and corn steep liquor concentrations as well as ionic strength (based on phosphate buffer concentration) as the three main independent components of the culture medium that significantly (p < 0.05) influenced biomass and poly(3-hydroxybutyrate…
The effects of varying the modulation index and the switching frequency on steel lamination core losses when excited with pulse width modulated waveforms are first investigated. A switched reluctance motor flux model is also developed and flux waveforms for different parts of the machine are synthesized. Using these f…
A new isoflavan, (3R)-6,2'-dihydroxy-7-methoxy-4',5'-methylenedioxyisoflavan, hildegardiol (1), and two known flavonoids, 2-hydroxymaackiain (2) and farrerol (3), were isolated from the antifungal root extract of Hildegardia barteri. The pterocarpan 2 was largely responsible for the observed antifungal activity.
A synthetic sequence to salts of N-alkylated pyridine-bridged 1,2,3-thiaselenazolo-1,2,3-thiaselenazolylium cations [2]+ (R1 = Me, Et; R2 = H) is described. The corresponding radicals 2 (R1 = Me, Et; R2 = H) can be generated from the cations by chemical or electrochemical reduction. Crystals of the two radicals are is…
A significant improvement of electromigration (EM) lifetime is achieved by modification of the preclean step before cap-layer deposition and by changing Cu cap/dielectric materials. A possible mechanism for EM lifetime enhancement was proposed. Cu-silicide formation prior to cap-layer deposition and adhesion of Cu/cap…
Two different approaches for studying sample’s contributions to diffraction-line broadening are analyzed by applying them to several nickel hydroxide samples. Both are based in the refinement of powder diffraction data but differ in the microstructural model used. The first one consists in the refinement of the powder…
Bismuth ferrite (BiFeO 3 ) thin films were fabricated by depositing sol–gel solutions on Pt/Ti/SiO 2 /Si(100) structures. X-ray diffraction (XRD) showed that a polycrystalline phase and also a small fraction of a secondary phase, Bi 2 Fe 4 O 9 , were present in the film. The nonperovskite secondary phase decreased wit…
Soil nitrogen-supply power (NSP), including nitrogen (N) mineralized from organic matter, for crop growth is an important criterion in evaluating soil quality. Ion-exchange membranes in the form of plant root simulator (PRS) probes were used to measure ammonium and nitrate release rates as a measure of NSP in 54 Saska…
The reaction of Rh(C2H4)2(acac) with the partially dehydroxylated surface of dealuminated zeolite Y (calcined at 773 K) and treatments of the resultant surface species in various atmospheres (He, CO, H2, and D2) were investigated with infrared (IR), extended X-ray absorption fine structure (EXAFS), and 13C NMR spectro…
This paper describes a facile hydrothermal procedure capable of aligning CdS nanocrystals on multiwalled carbon nanotubes (MWCNTs) without the use of organic bridging molecules such as cysteamine and carboxylates. The direct placement of CdS on MWCNTs allows good mixing and better interfacing between the two nanophase…
Using the self-consistent field theory (SCFT), we investigate the phase behavior of a mixture of diblock copolymers and nanoparticles with monodisperse polymer chains tethered to their surfaces. We assume the size of the nanoparticles to be much smaller than that of the attached polymer chains and therefore model the…
The size dependence of the dielectric properties of BaTiO 3 nano-grains was investigated using films prepared by RF-plasma chemical vapor deposition. BaTiO 3 nanoparticles were directly deposited on Pt/Al 2 O 3 /SiO 2 /Si substrates; then they were annealed at temperatures between 600 and 900°C in order to control the…
XPS measurements of poly(vinyl chloride) recorded with a SSX-100 spectrometer in standardized experimental conditions are presented: survey scan, high resolution core level spectra as well as the energy loss regions of carbon and chlorine peaks are analyzed. This is part of a contract work aiming to record spectra in…
We introduce the crystal Mahler measure and we express the original Mahler measure using the crystal Mahler measure. With this expression, we calculate the Mahler measure for various families of polynomials.
The sound wave in the air between the fibers of glass wool exerts an oscillatory viscous drag on the fibers and excites a mechanical wave in the fiber skeleton. Accurate calculations of sound attenuation in glass wool must take the mechanical wave in the fiber skeleton into account, and this requires knowledge of the…
The electronic structures of four well-known modifications of crystalline SrZrO 3 with different symmetries, namely, the cubic ( Pm3m ), tetragonal ( I 4/ mcm ), and two orthorhombic ( Cmcm, Pbnm ) modifications, are calculated in the framework of the density-functional theory in the basis set of the linear combinatio…
The readily prepared 2,3,9,10,16,17,23,24-octamethyl-1,4,8,11,15,18,22,25-octaoctyloxyphthalocyanine (Pc 1) adopts a non-planar conformation in the crystalline state as indicated by a dihedral angle of 27.2° formed between isoindole subunits on opposite sides of the core. The ring distortion can be attributed to a com…
Electroluminescent ZnS:Mn thin films were deposited by the atomic layer deposition (ALD) technique. The deposition processes were based on ZnI2 or ZnCl2 as the Zn source and Mn(thd)3 (thd=2,2,6,6-tetramethyl-3,5-heptanedionato) as the Mn source. The ZnI2 process was found to have a wide temperature range between 300 a…
The One Atmosphere Uniform Glow Discharge Plasma (OAUGDP™) generates a normal glow electrical discharge at 1 atmosphere in air and other gases. This plasma has been used to treat meltblown and electrospun nylon and polyurethane (PU) fabrics, and has produced an increase in the surface energy/wettability in all cases.…
We investigated the temperature dependence of the charge disproportionation in the charge ordered quasi one-dimensional conductors (TMTTF) 2 AsF 6 and (TMTTF) 2 PF 6 by infrared spectroscopy. In the mid-infrared, we observed a splitting of characteristic vibronic modes below the charge-order transition which can be di…