Materials Literature
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${\mathrm{CN}}_{x}$ films were found to have a distorted graphitelike microstructure consisting of buckled and curved basal planes using high-resolution electron microscopy. Nanoindentation showed an elastic recovery of 85%, and a hardness of $\ensuremath{\sim}60$ GPa. Based on detailed quantum chemical calculations a…
This study investigated a model theory of the changes in magnetization that a ferromagnetic material undergoes when subjected to an applied uniaxial stress. The description of these effects is shown to be totally different from the description of the changes in the hysteresis curve under a series of constant applied s…
Polarization aberrations due to varying polarization state across the field of view (FOV) are investigated for crossed folding mirrors. We define crossed mirrors as oriented in space such that s-polarized light incident on the first mirror is p-polarized at the second mirror. This completely compensates for polarizati…
In the molecular scheme of living organisms, adenosine 3',5'-monophosphate (cyclic AMP or cAMP) has been a universal second messenger. In eukaryotic cells, the primary receptors for cAMP are the regulatory subunits of cAMP-dependent protein kinase. The crystal structure of a 1-91 deletion mutant of the type I alpha re…
Energy dispersive x ray diffraction measurements were performed on RbH to 120 GPa. RbH was observed to transform from the B2 phase to the orthorhombic, CrB, phase at 85 GPa. The equation of state for the B2 phase and the CrB phase are reported. Transmission measurements were made to 120 GPa to determine the band gap v…
The method of molecular dynamics computer simulations is employed to study oligomer melts confined in ultra-thin films and subjected to shear. The focus is on the self-diffusion of oligomers near attractive surfaces and on their desorption, together with the effects of increasing energy of adsorption and shear. It is…
Ion-beam sputtering has been used to prepare Fe/Si multilayers on a variety of substrates and over a wide range of temperatures. Small-angle x-ray diffraction and transmission electron microscopy experiments show that the layers are heavily intermixed although a composition gradient is maintained. When the spacer laye…
We present a quantitative model for Na partitioning between clinopyroxene and silicate melt, applicable in the range 0.1 MPa to 6.0 GPa, 1000–2000°C over a wide span of composition. Our model is derived from the Jadeite melting equilibrium, via the relationship Δ G ƒ( P , T ) = − RT ln K ƒ = RT ln D * Na where Δ G ƒ(…
The structures and melting of n-butanol and n-pentanol monolayers adsorbed on graphite have been studied by x-ray diffraction. The structures of both monolayers change between partial and complete monolayers. The complete monolayer of butanol, as well as the partial monolayer of pentanol, take herringbone structures s…
Transported proteins often contain an extension sequence called the signal peptide. The alkaline phosphatase (PhoA) signal sequence represents a typical signal peptide for comparison to idealized sequences both in vivo and in vitro. We have designed a series of idealized signal sequences which vary in amino terminal c…
Abstract The influence of fiber type and fiber‐surface properties on matrix flow behavior was investigated using structural reaction injection‐molding (SRIM). The influence of fiber type, fiber‐surface properties, and matrix type on strength properties in elastomeric composites reinforced with nonwoven fibrous structu…
Abstract A general kinetic reaction network has been suggested for the gradual chian growth polyaddition process for the synthesis of linear chain polyurethane. Based on the results from the kinetic investigation of the reactions of model aromatic/aliphatic isocyanates and alcohols and hydroxyethers, some methods were…
We present a numerical, self-consistent field study of adsorbed diblock copolymers in thermal solvents, with a detailed and quantitative comparison with recent experiments performed on poly(dimethylsiloxane-block-styrene) copolymer spread as a monolayer at the free surface of ethyl benzoate [M. S. Kent, L. T. Lee, B.…
The genes for two Sac7 DNA-binding proteins, Sac7d and Sac7e, from the extremely thermophilic archaeon Sulfolobus acidocaldarius have been cloned into Escherichia coli and sequenced. The sac7d and sac7e open reading frames encode 66 amino acid (7608 Da) and 65 amino acid (7469 Da) proteins, respectively. Southern blot…
We have employed Langmuir monolayers of polydimethylsiloxane-polystyrene diblock copolymers as a model system for examining layers of tethered chains under good solvent conditions. The range of surface density accessible with this system coincides with the ranges reported in the literature for chains tethered onto sol…
In this paper we present and discuss experimental results on molecular mobility in propylene glycol and its three oligomers confined to the ∼100 Å pores of a controlled porous glass. The objective is to elucidate the finite size effects on the dynamics of hydrogen-bonded liquids of different molecular weights but iden…
We study the dynamics of adatoms in a model of vicinal (11m) fcc metal surfaces. We examine the role of different diffusion mechanisms and their implications to surface growth. In particular, we study the effect of steps and kinks on adatom dynamics. We show that the existence of kinks is crucially important for adato…
Elastic matrix distortion around a growing inclusion of a new phase is analyzed and the associated contribution to the Gibbs free energy is considered. The constant-composition transformation from the parent to product phase is considered within the frame of Landau theory of phase transitions. The volume misfit betwee…
A theoretical analysis is presented for the morphological evolution and stability of transgranular wedge-shaped voids in conductor lines with bamboo grain structure under an applied electric field. A linear stability analysis identifies void shapes that become unstable with respect to the growth of perturbations with…
The paramagnetic radicals formed in the TL phosphors BaSO 4 :Eu and BaSO 4 :Eu, P have been studied using the technique of ESR. Two radicals assigned to SO 2 - , were observed at room temperature. One of them exhibits a hyperfine interaction with a nearby cation. Step annealing measurements suggest a connection betwee…