Materials Literature
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The time-dependent quasi-one-dimensional transport of electrons or holes along the molecular columns in columnar liquid crystals has been studied. Recent mobility measurements on the tryphenylene-based HAT-n materials have revealed Gaussian transits in the liquid crystalline phases but dispersion in the crystalline ph…
The chemical reactions occurring in the thermal treatment of bisphenol-A polycarbonate (PC) and poly(methyl methacrylate) (PMMA) blends have been investigated by nuclear magnetic resonance (NMR), mass spectrometry (MS), size exclusion chromatography (SEC), and thermogravimetry (TG). Our results suggest that in the mel…
To investigate responses to longitudinal torsion and the effect of temperature on the torsional stiffness of superelastic nickel titanium archwires, eight batches of rectangular wires were tested at 18, 27, 37, and 40 degrees C ambient temperature. The wires were twisted 25 degrees and studied in deactivation. The res…
We have measured multicomponent chemical diffusion coefficients in a melt near to the low pressure water-saturated eutectic granite composition in the system K 2 O-Na 2 O-Al 2 O 3 -SiO 2 -H 2 O at 1.0 GPa and temperatures of 1300 and 1600 ℃. The measured diffusion profiles can be accounted for within the analytical er…
In Saccharomyces cerevisiae, the cytosolic and promitochondrial isoenzymes of fumarate reductase are encoded by the FRDS and OSM1 genes, respectively. The product of the OSM1 gene is reported to be required for growth in hypertonic medium. Simultaneous disruption of the FRDS and OSM1 genes resulted in the inability of…
Meso, meso′-buta-1,3-diyne-bridged Ni (II) octaethylporphyrin dimer thin films have been deposited by the Langmuir–Blodgett method and, for the first time, have been considered as the active layer in resistive gas sensors. In particular, the electrical conductivities of these films undergo a remarkable variation due t…
▪ Abstract Doped manganite perovskites exhibit large magnetoresistance, but usually only in high fields (>1 Tesla). Efforts are under way to understand the underlying mechanism and to explore possibilities of achieving large magnetoresistance at low fields, which has led to focused studies of spin-dependent transpo…
Macropore formation during anodization of highly resistive p‐type crystalline silicon in HF is reported for the first time. This formation is due to an instability of the dissolution attributed to the high resistivity of the silicon electrode as compared to that of the electrolyte, as it had been observed during anodi…
Abstract The density of proteins is an important quantity. For ab initio phasing in X-ray crystallography, such as low resolution envelope techniques [1, 2], an accurate protein density is essential to get a correct prediction of the protein volume from the amino acid sequence. An accurate value will also facilitate t…
The stress rupture characteristics of an enhanced Nicalon/SiC composite at 900°C have been examined. This temperature has been identified as being in the regime wherein oxidation embrittlement is operative. The enhancement of the composite involves the use of a coating around the fiber tows, comprising a C‐rich matrix…
The interrelation of degree and type of cross-linking and viscoelastic properties of sulfur-cured natural rubber (NR) vulcanizates was investigated by altering accelerator concentration, cure time, and cure temperature. Constants C 1 and C 2 from the Mooney-Rivlin equation were given via stress-strain measurement to e…
Bulk ${\mathrm{Al}}_{x}{\mathrm{As}}_{40}{\mathrm{Te}}_{60\ensuremath{-}x}$ and ${\mathrm{Al}}_{x}{\mathrm{As}}_{40\ensuremath{-}x}{\mathrm{Te}}_{60}$ glasses $(5<~x<~20)$ are found to exhibit memory and threshold switching. ${}^{27}\mathrm{Al}$ solid-state NMR measurements reveal that in both series of glasses,…
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…