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Buckling Behaviour of Laminated Composite Plates Under Thermal Loading
Fluid dynamics: theory, computation, and numerical simulation
New Designs for the Nuclear Renaissance
The next generation of nuclear power plants could help satisfy the world’s energy needs and support a hydrogen-based economy.
Transport Properties of Modified Montmorillonite-Poly(e-caprolactone) Nanocomposites
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…
Phase transitions and dielectric properties in A-site ion substituted (Na1/2Bi1/2)TiO3 ceramics (A=Pb and Sr)
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…
Phosphorylation Positively Regulates DNA Binding of the Carbon Catabolite Repressor Cre1 of Hypocrea jecorina(Trichoderma reesei)
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…
Influence of iron–silicon interaction on the growth of carbon nanotubes produced by chemical vapor deposition
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…
Isolating the effect of radiation-induced segregation in irradiation-assisted stress corrosion cracking of austenitic stainless steels
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 Binding Properties of Tetraoctylammonium Bromide-Capped Gold Nanoparticles
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…
Photomagnetism and structure in cobalt ferrite nanoparticles
Light-induced changes in the coercivity ΔHc are reported for cobalt ferrite nanoparticles. These changes arise from charge transfer initiated by optical absorption near 2 eV. An insulator-to-metal transition at 170 K is an upper limit for significant ΔHc. The larger ΔHc for smaller (17 nm) particles was correlated wit…
Giant change in infrared light transmission in La0.67Ca0.33MnO3 film near the Curie temperature
Transport, magnetic, magneto-optical (Kerr effect) and optical (light absorption) properties have been studied in an oriented polycrystalline La0.67Ca0.33MnO3 film which shows colossal magnetoresistance. The correlations between these properties are presented. A giant change in infrared light transmission (more than a…
Intra- site 4f-5d electronic correlations in the quadrupolar model of the gamma-alpha phase transition in Ce
As a possible mechanism of the $γ-α$ phase transition in pristine cerium a change of the electronic density from a disordered state with symmetry Fm-3m to an ordered state Pa-3 has been proposed. Here we include on-site and inter- site electron correlations involving one localized 4f-electron and one conduction 5d-ele…
Long-range Effects on the Pyroelectric Coefficient and Dielectric Susceptibility of a Ferroelectric Bilayer
Long-range effects on the pyroelectric coefficient and susceptibility of a ferroelectric bilayer with a ferroelectric interfacial coupling are investigated by use of the transverse Ising model within the framework of mean-field theory. The effects of the interfacial coupling and the transverse field on the pyroelectri…
Molecular dynamics in nanostructured polyimide–silica hybrid materials and their thermal stability
Abstract Molecular motion and thermal stability in two series of nanophase‐separated polyimide–silica (PI–SiO 2 ) hybrid materials with chemically bound components were studied. The hybrids were synthesized from p ‐aminophenyltrimethoxysilane‐terminated poly(amic acid)s as PI precursors and tetramethoxysilane as a sil…
Raman properties of GaSb nanoparticles embedded in SiO2 films
The Raman shifts of nanocrystalline GaSb excited by an Ar+ ion laser of wavelengths 514.5, 496.5, 488.0, 476.5, and 457.9 nm are studied by experiment and explained by phonon confinement, tensile stress, resonance Raman scattering and quantum size effects. The Stokes and anti-Stokes Raman spectra of GaSb nanocrystals…
Landauer-Büttiker-type current formula for hybrid mesoscopic systems
A general Landauer-Büttiker-type current formula is derived, which can be applied to the ferromagnet (F)/Normal metal (N)/superconductor (S), F/N/N, N/N/S and N/N/N systems in the presence of various kinds of interactions in the central region.
Liquid crystal phases of achiral banana-shaped molecules: a computer simulation study
The phase behaviour of achiral banana-shaped molecules was studied by computer simulation. The banana-shaped molecules were described by model intermolecular interactions based on the Gay-Berne potential. The characteristic molecular structure was considered by joining two calamitic Gay-Berne particles through a bond…
Improving the Clinical Patency of Prosthetic Vascular and Coronary Bypass Grafts: The Role of Seeding and Tissue Engineering
In patients requiring coronary or peripheral vascular bypass procedures, autogenous vein is currently the conduit of choice. If this is unavailable, then a prosthetic material is used. Prosthetic graft is liable to fail due to occlusion of the graft. To prevent graft occlusion, seeding of the graft lumen with endothel…
Thermal Conductivity of Platelet‐Filled Polymer Composites
Platelet‐shaped particles of similar size and shape were investigated as fillers for improving the thermal conductivity of polymer–ceramic composite materials. The conductivities of composites filled with hard, stiff ceramic particles exceeded 3.5 W·(m·K) −1 , or >20 times the conductivity of the polymer matrix, an…