Materials Literature
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The dielectric properties of liquid crystal materials containing ionic impurities are analyzed in terms of space charge polarization. The theoretical expressions of the dielectric constant and the dielectric loss factor are derived by solving a diffusion equation for mobile ions under an AC field. Numerical calculatio…
Three kinds of poly(vinylsilane)s, which include oligomers, were prepared by the polymerizations of vinylsilane [CH 2 CHSiH 3 ] using a radical initiator catalyst, an anionic catalyst, and a coordinated anionic catalyst (Ziegler−Natta catalyst). A colorless and transparent liquid polymer of molecular weight ( M n ) 50…
Density functional theory has been successfully applied to characterize the electronic structure and the magnetic properties of the mixed valence dinuclear complex [Fe 2 (OH) 3 (tmtacn) 2 ] 2+ modeled by replacing the tmtacn ligand with three ammonia molecules. Spectroscopic and magnetic properties have been computed…
Type 310 (UNS S31000) stainless steel (SS) membranes were precharged with hydrogen at various current densities. Effects of hydrogen on pitting susceptibility were investigated by carrying out the ASTM G 48 standard ferric chloride (FeCl3) tests. Changes in pit density, pit size distribution, average pit diameter (Da)…
An additional anion-induced enhancement of surface-enhanced Raman scattering (SERS) and surface-enhanced resonance Raman scattering (SERRS) for Rhodamine 6G adsorbed on a silver electrode upon addition of chloride and citrate anions was determined as a function of the applied potential. The observed increase in intens…
Biomaterials are increasingly used for clinical applications. However, loss of function may occur owing to tissue reactions, which are mainly caused by a variety of inflammatory reactions. Recently, we demonstrated that macrophages (MO) and T cells play key roles in these reactions. Since immunological studies showed…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTheoretical Studies on SN2-Reaction of MeBr with Me2CuLi·LiCl. Solvent and Cluster Effects on Oxidative Addition/Reductive Elimination PathwayEiichi Nakamura, Seiji Mori, and Keiji MorokumaView Author Information Department of Chemistry, The University of Tokyo Bunkyo-…
A Monte Carlo simulation of the quality dependence of different TL materials, in the form of discs 3.61 mm in diameter and 0.9 mm thick, in radiotherapy photon beams relative to 60Co gamma-rays has been performed. The beam qualities ranged from 50 kV to 25 MV x-rays. The TL materials were: CaF2, CaSO4, LiF and Li2B4O7…
Recent measurements of the viscosity of polydimethylsiloxane (PDMS) melts swollen with dissolved carbon dioxide at 50 and 80°C by Gerhardt et al. have shown that classical viscoelastic scaling factors can be employed to superpose the viscosity curves for CO2-swollen melts onto the viscosity curve for pure PDMS at the…
The growth of pits in 209 nm thick Al films in chloride solutions with and without dichromate ions was examined using image analysis of the growing pits to determine pit current density. In pure chloride solutions, the pit current density decreased at high potentials after reaching a maximum value, and then was almost…
We have used Monte Carlo simulation techniques to obtain the magnetic phase diagram of the double-exchange Hamiltonian. We have found that the Berry phase of the hopping amplitude has a negligible effect in the value of the magnetic critical temperature. To avoid finite size problems in our simulations we have also de…
The protein WrbA had been identified as an Escherichia coli stationary-phase protein that copurified and coimmunoprecipitated with the tryptophan repressor. Sequences homologous to WrbA have been reported in several species of yeast and plants. We previously showed that this new family of proteins displays low but str…
INTRODUCTION Combining thermal analysis (TA) with gas-analykal techniques significantly enhances the possibilities for correctly interpreting the mechanism of thermally induced reactions, which involve the formation of gaseous species. Several techniques can be used for evolved gas analysis (EGA), ranging from simple,…
Electrically conductive silicone rubber composites have been prepared through incorporation of conductive acetylene black and short carbon fibre (SCF). The percolation limit for the attainment of high conductivity is found to be relatively less for silicone rubber based composites compared to EPDM or NBR based composi…
Phengitic muscovite-2M 1 crystals [ [12] (K 0 . 88-0 . 99 Na 0 . 01-0.09 Ca 0 . 00-0.06 Ba 0 . 00-0.01 ) [6] (Al 1 . 64-1.88 Fe 2+ 0.06-0 . 29 Fe 3+ 0.01-0.16 Mg 0.00-0.16 Mn 0.00-0.07 Ti 0.00-0.06 ) [4] (Si 2.87-3.30 Al 0.70-1.13 )(OH) 1.56-2.07 F 0.00-0.41 O 9.91-10.25 ] from pegmatites and peraluminous granites wer…
Field emission properties of undoped chemical vapor deposited diamond and diamond-like carbon films have been measured for a variety of different deposition conditions. The nature and appearance of the damage site after testing has been investigated with scanning electron microscopy and laser Raman mapping. These obse…
The grain growth in silica‐doped 3‐mol%‐yttria‐stabilized tetragonal zirconia polycrystals (SiO 2 ‐doped 3Y‐TZP) and undoped 3Y‐TZP has been examined in the temperature range of 1400°‐1800°C. The presence of a SiO 2 phase inhibits rather than promotes the grain growth in 3Y‐TZP, particularly at high temperatures. Duri…
This paper reports on aging of the silicone oil MS704 for sudden changes of temperature from 210.5 to 209.0 K and from 207.5 to 209.0 K studied by continuously monitoring the instantaneous shear modulus ${G}_{\ensuremath{\infty}}$. The results are interpreted within the Tool-Narayanaswamy formalism with a reduced time…
Dynamic light scattering and sedimentation measurements are carried out to study the motion of probe particles in neutral and adsorbing polymer solutions. By varying the microscopic interaction between the colloidal particle and the polymer molecule, we observe three different behaviors to the Stokes−Einstein (SE) equ…
The collective behavior of a system of straight parallel dislocations is investigated. It is found by numerical simulation that the internal stress $\ensuremath{\tau}$ created by the dislocation has a stochastic component. In order to describe this stochastic character the form of the probability distribution function…