Materials Literature
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The objective of this study is mainly to review recent work concerning the numerical modeling of the stick-slip and gross melt fracture polymer extrusion instabilities. Three different mechanisms of instability are discussed: (a) combination of nonlinear slip with compressibility; (b) combination of nonlinear slip wit…
Article Improved Mechanical Properties of SiC Fibers Pyrolyzed from Polycarbosilane under Tension was published on April 1, 2002 in the journal Science and Engineering of Composite Materials (volume 10, issue 2).
The vane geometry with a large gap is used to determine the Newtonian, non-Newtonian and viscoelastic properties of complex fluids. We show that when this geometry is carefully characterized, it can be used for precise rheometry. A novel effective cylinder approximation is used to obtain the shear rate and shear stres…
The next generation of nuclear power plants could help satisfy the world’s energy needs and support a hydrogen-based economy.
A series of montmorillonite-poly(ε-caprolactone) nanocomposites were prepared according to a two-stage procedure. In the first step Na-type silicate clay was cation exchanged with protonated 12-aminolauric acid. In the second step ε-caprolactone was intercalated in the modified clay and ring-opening polymerized. The c…
The dielectric permittivity of A-site ion substituted (Na1/2Bi1/2)TiO3(A=Pb,Sr) solid solutions has been investigated with the aid of structural analysis. As the addition of PT increased, the first order characteristics of the phase transition appeared. In contrast, additions of ST made the solid solution exhibit rela…
Cre1 of the ascomycete Hypocrea jecorina is a Cys(2)His(2) zinc finger DNA-binding protein functioning as regulator for carbon catabolite repression. It represents the functional equivalent of yeast Mig1, known to be negatively regulated by the Snf1-kinase at the nuclear import level. We demonstrate that Cre1 is also…
Carbon nanotubes are often grown by chemical vapor deposition on silicon substrates covered with an iron catalyst. Photoemission and scanning electron microscopy studies presented here reveal how the iron silicide interface phase formed at elevated temperatures influences the catalytic efficiency of the iron. Moreover…
Post-irradiation annealing was used to help identify the role of radiation-induced segregation (RIS) in irradiation-assisted stress corrosion cracking (IASCC) by preferentially removing dislocation loop damage from proton-irradiated austenitic stainless steels while leaving the RIS of major and minor alloying elements…
Surface interaction of gold nanoparticles with solvents and functionalized organic molecules is probed using the changes in the surface plasmon absorption band. A red shift in the surface plasmon band is observed with increase in solvent dielectric constant for solvents that do not complex with metal surface. A plot o…