Materials Literature
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The effect of DC flux on the core loss is examined for the practical range of power and frequency. Relevant core loss equations are derived and applied to an optimization algorithm to determine the minimum core loss at a given ratio of s (DC flux density to AC peak flux density). It has been found that the curves of h…
The tensile stress dependence of magneto-impedance (MI) in CoSiB and CoFeSiB amorphous wires is reported. A phenomenological model for the transverse susceptibility based on a simple domain structure, and which includes the magneto-elastic energy contribution, is used. The square-root of the transverse susceptibility…
Abstract Blends composed of poly(ethylene terephthalate) (PET) and poly(butylene terephthalate) (PBT) were melt‐mixed in a Brabender cam mixer at different mixing speeds. The glass transition ( T g ) and the crystallization behavior of the blends from glassy state were studied using DSC. It was found that although the…
The paper reports a study of CVD deposited thin films (1−5 μm) of an Si−B−N−C ceramic polymer coating onto a tow of carbon fibers. The coating process was developed with the goal of good adhesion and good oxidation protection for the fibers when exposed to a reactive oxygen environment. Core and valence band photoemis…
We review the experimental and theoretical investigations of the kinetics of ferroelectric domain structure in single crystals and thin films. The significant influence of the retardation of screening process on the evolution of the domain structure is pointed out and is demonstrated in various experimental situations.
Carbon‐fiber‐reinforced carbon (CfC) composites have been joined by using different joining agents: metals (silicon, aluminum, and titanium), an intermetallic compound (magnesium silicide, Mg 2 Si), and glasses (borosilicates and zinc borates). These joining agents have been chosen by considering their possible use in…
An attenuated total reflection (ATR) method to excite the surface plasmon polariton (SPP) was applied to gold and copper to improve the sensitivity level of classical Raman spectroscopy. Reflectivity and Raman band intensity from copper phthalocyanine (CuPc) adsorbates on these metals were measured in an Otto configur…
Effective diffusivities and adsorption uptakes have been measured in mesoporous silica particles using frequency-modulated perturbation methods. Intraparticle diffusivities in the Knudsen regime were measured for N 2, Xe, Xe/N 2 mixtures, and isobutane at low pressure and several temperatures. The measured diffusiviti…
The α3-peptide, which comprises three repeats of the seven-residue sequence Leu-Glu-Thr-Leu-Ala-Lys-Ala, was designed to form an amphipathic α-helix with a hydrophobic surface by Leu residues and a hydrophilic surface by Glu and Lys residues, thus yielding a coiled coil or a helical bundle structure through their asso…
The activation of molecular oxygen on the surface of cerium oxide and the reactivities of surface oxygen species with methane and ethane were studied by means of in situ confocal microprobe Raman spectroscopy in the temperature range 298–1023 K. The results showed that O22-, O2- and O2δ- (0<δ<1) adspecies formed on th…
Addition of the bis(β-diketone) ligand L [L = 1,3-bis(3-phenyl-3-oxopropanoyl)benzene] to a suitable source of M III ions (M = Ti, V, Mn, Fe) in a L:M = 3:2 ratio gives the dinuclear products [M 2 L 3 ], which have a triple-helical structure.
▪ Abstract Casting of molten metals against a spinning wheel substrate is considered. Issues of fluid mechanics divide between steady and unsteady behavior (stability). The previous work on steady casting is hung on a framework provided by the long-puddle model of planar flow casting. Heat and fluid flow interact only…
Protein adsorption and complement activation were studied on thin evaporated films of titanium (Ti). The surfaces were cleaned in either a radio frequency (RF) plasma unit, or washed sequentially in trichloroethylene, acetone, ethanol, and water. Both methods resulted in hydrophilic surface with low carbon contaminati…
This paper presents a new expression of the vector magnetic properties under alternating and rotating flux conditions. The expression is defined by an improved reluctivity tensor based on measured results. Moreover, the expression is more accurate than conventional expressions about the approximation of magnetic prope…
A method was developed for construction of stability diagrams for metals in the presence of realistically modeled aqueous solutions. The method was based on a comprehensive thermodynamic model that combines the Helgeson-Kirkham-Flowers (HKF) equation of state for standard-state properties with a solution nonideality m…
MurB catalyzes the second committed step in the synthesis of peptidoglycan, a key component of the bacterial cell wall. The crystal structures of both a S229A mutant and wild-type MurB in the presence of the substrate enolpyruvyl-UDP-N-acetylglucosamine were solved and refined at 1.8 A resolution. The single point mut…
Abstract Samples of isotactic polypropylene(PP) were subjected to stress‐relaxation experiments after simple tensile tests at four strain rates and at different levels of temperature. The relaxation moduli were determined in the range of temperature between 20 and 80°C with a relaxation period of 1200s duration. The a…
The relations between fabric compression and friction are examined. It is found that the higher the fabric compression, the larger is the difference between the static- and kinetic-friction forces. The influence of some experimental variables such as normal load, area, and time of contact on frictional properties is a…
A detailed study of the layered manganite La 1+ x Sr 2- x Mn 2 O 7 has been performed, establishing that within the composition range 0.1 ≤ x ≤ 0.45 the phases crystallize in the I 4/ mmm space group. The evolution of structural parameters with x in this composition range has been followed using a novel application of…
The state of the art in proton conducting polymers is described and the interest in the use of sulfonamide groups to prepare a series of such polymers is stressed. The most relevant aspects of the chemical and physical characteristics of sulfamide are reviewed. Its history is briefly presented. A detailed description…