Materials Literature
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The evolution of crystallinity and mechanical properties of two different series of PP-homopolymers (RE grades coming directly from the polymerization reactor and CR grades priorly subjected to a defined degradation process) as influenced by the molar mass and heterogeneous nucleation was investigated, including one h…
A new phosphorus-containing oxirane, bis-(3-glycidyloxy)phenylphosphine oxide (BGPPO), was synthesized. Further curing BGPPO with diamine curing agents, dicyanodiamide (DICY), 4,4′-diaminodiphenylmethane (DDM), and 4,4′-diaminodiphenylsulfone (DDS), respectively, resulted in several phosphorylated epoxy resins. Compar…
We present simulations, without electrodynamical assumptions, of $B(x,y,H(t)), M(H(t))$, and $J_c(H(t))$, in hard superconductors, for a variety of twin-boundary pinning potential parameters, and for a range of values of the density and strength of the pinning sites. We numerically solve the overdamped equations of mo…
Rigid Perfectly Plastic Body Plastic Deformation Elastic and Residual Strain Yield Stress Elasticity Domain Rate Insensitivity Basic Properties of Plastic Materials Admissible Stresses. Yield Surface Stress Space Admissible Stresses Yield Surface Constitutive Relations Normality Flow Rule Constitutive Maximum Principl…
We present simulations of flux-gradient-driven superconducting rigid vortices interacting with square and triangular arrays of columnar pinning sites in an increasing external magnetic field. These simulations allow us to quantitatively relate spatio-temporal microscopic information of the vortex lattice with typicall…
It is shown how the phase-space kinetic theory of polymeric liquid mixtures leads to a set of extended Maxwell-Stefan equations describing multicomponent diffusion. This expression reduces to standard results for dilute solutions and for undiluted polymers. The polymer molecules are modeled as flexible bead-spring str…
The hydrosulfido-bridged diruthenium complex [Cp*RuCl(μ-SH) 2 RuCp*Cl] ( 4; Cp* = η 5 -C 5 Me 5 ) was obtained by the reaction of either [(Cp*Ru) 4 (μ 3 -Cl) 4 ] ( 1 ) or [Cp*RuCl(μ-Cl) 2 RuCp*Cl] with excess H 2 S gas, while the reactions of 1 with thiols resulted in the formation of the thiolato-bridged diruthenium…
The quantity w^N(r) = ( 1/ k^2 T_el)[partial n(r, T_el) / partial T_el]_(v(r),N) is introduced as a convenient measure of the local isoelectronic reactivity of surfaces. It characterizes the local polarizability of the surface and it can be calculated easily. The quantity w^N(r) supplements the charge transfer reactiv…
Additives Biodegradable Polymers Biomaterials for the Body Biomimetic Materials Biosensors Blends Block Copolymers Block Copolymer Micelles Comb-like Polymers Commercial Resins, Plastics, Elastomers Composites Compatibilizers Conducting Polymers Contact Lens Materials Controlled Release Dendrictic Polymers Dendrimers…
What electronic structure provides the largest figure of merit for thermoelectric materials? To answer that question, we write the electrical conductivity, thermopower, and thermal conductivity as integrals of a single function, the transport distribution. Then we derive the mathematical function for the transport dis…
Introduction History of the Invention and Development of the Polyimides, C. E. Sroog Synthesis Synthesis of Polyimides, Tohru Takekoshi Synthesis of Polyamideimides, Yoshio Imai Synthesis of Fluorinated Polyimides, Shigekuni Sasaki and Shiro Nishi Photosensitive Polyimides, Molecular Design and Synthesis, Toshihiko Om…
The well-known phase transition from InSb-IV to InSb-III at $\ensuremath{\sim}10\mathrm{GPa}$ has been studied using angle-dispersive powder-diffraction techniques. It is shown that the transition proceeds through a previously undetected intermediate phase, and that InSb-III is in fact identical with InSb-II. The appa…
A systematic study of the defects in ZnO has been performed. The two commonly observed levels (L1, L2), located at around 0.15 and 0.24 eV under the conduction band, have been identified as native defects. The deep level transient spectroscopy depth profiling technique is applied on multilayer-chip-type ZnO varistors…
The photoluminescence excitation technique is used to monitor the absorption characteristics of Si nanocrystals. Contributions from different critical points are identified, and their shift with reduced size is deduced. The enhancement of the oscillator strength of the indirect optical transitions due to the confineme…
The microstructure of filtered cathodic vacuum arc deposited tetrahedral amorphous carbon films is studied as a function of ion energy. An optimum energy window in the density and C–C sp3 content at an ion energy of ∼90 eV observed in this study. It is shown that the density of the amorphous carbon films are closely r…
We use inelastic neutron scattering to measure the spin wave dispersion throughout the Brillouin zone of the double-exchange ferromagnet L${\mathrm{a}}_{0.7}$P${\mathrm{b}}_{0.3}$Mn${\mathrm{O}}_{3}$. Magnons with energies as high as 95 meV are directly observed and an unexpectedly simple Heisenberg Hamiltonian, with…
States of charge carriers in transition metal compounds with low-frequency zero-spin - nonzero-spin transitions (e.g. some Co compounds) are investigated. Such transitions indicate the appearance of magnetic excitons on the transition metal ions. Charge carriers interact strongly with the excitons via exchange forces.…
The localization of low-frequency vibrational modes in amorphous solids can be determined from incoherent neutron scattering. Time-of-flight data from polystyrene and polybutadiene show a localization of the boson peak modes to about ten monomers.
The Escherichia coli pdxC(serC) gene codes for a transaminase (EC 2.6.1.52). The gene is involved in both pyridoxine (vitamin B6) and serine biosynthesis and was overexpressed as a MalE/PdxC(SerC) fusion protein. The fusion protein was purified by affinity chromatography on an amylose resin and hydrolyzed in the prese…
A simple model is presented to describe the phase behavior in binary mixtures of a flexible polymer and a liquid crystal. By using the incompressible approximation to the Onsager theory which combined both the excluded volume interactions between the liquid crystals and the attractive interaction due to the alignment…