Materials Literature
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To synthesize nonlinear optical polyimides exhibiting high nonlinearity and high thermal stablity, a new monomer bearing phenylenediamine and a diazo benzene-type nonlinear optical chromophore (compound 1 ) was synthesized and polymerized with 4,4‘-(hexafluoroisopropylidene)diphthalic anhydride. This diazo chromophore…
A structured package for radiation analysis, SPRADIAN, is developed and its application is presented. This study is primarily motivated by necessity of a quantitative analysis of severe radiative environment which the MUSES-C capsule encounters during its reentry into the earth atmosphere. In comparison with other rad…
Resistivity and ac-susceptibility measurements demonstrate that the cation size mismatch at the $A$ site in perovskite manganites influences greatly the electrical and magnetic properties which are associated with colossal magnetoresistance. It has been reported that the Pr${}_{1\ensuremath{-}x}$Ca${}_{x}$MnO${}_{3}$…
The thermal behaviour and phase morphology of poly(3-hydroxybutyrate) (PHB) and starch acetate (SA) blends have been studied by differential scanning calorimetry, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy and polarizing optical microscopy. PHB/SA blends were immiscible. The melting t…
The electronic structure of In 2 O 3 has been studied for the first time using a first-principles calculation method based on the density functional theory. Although the complexity of the crystal structure of In 2 O 3 which contained 40 atoms in its unit cell had prevented studies of its electronic structure, we were…
PURPOSE: Thirteen male volunteers were studied to evaluate the MR imaging properties and pharmacokinetics of 10 mM mangafodipir trisodium infusion (MnDPDP, Teslascan). MATERIAL AND METHODS: Doses of 5 and 10 mumol/kg b.w. were administered by bolus injection (< 1 min) to 5 subjects, and by infusion (20 min) to 8 subje…
Tungsten erosion in the ASDEX Upgrade divertor has been measured by observing the WI emission at 400.9 nm. The sputtering yield is in the region of atoms/ion for typical divertor plasma conditions. By comparison of the measured sputtering yield with modelled sputtering yields one can conclude that tungsten erosion is…
We report the synthesis and morphological characterization of two triblock copolymers of the ABA type, where A is polystyrene (PS) and B polyisoprene (PI). The volume fraction of the minority component, PS or PI, is approximately 1/3. Cubic microdomain morphologies, already found in diblock and star block copolymers w…
This review describes the development and status of tracking research in Japan. First, the fundamentals of tracking and the influences of environmental stresses on tracking will be treated. Then, the principal tracking test methods currently in use will be characterized. Finally, some techniques for improving the trac…
Samples of soluble aromatic polyimides of varying chemical structure and molecular weight were synthesized in refluxing m-cresol at elevated temperatures through a one-step polymerization route. Modifications of the dianhydride and diamine monomers were designed to prepare aromatic polyimides having new architectures…
The reaction of ferrocene with molten imidazole at 150 °C yielded pale yellow crystals of composition [Fe 3 (imid) 6 (imidH) 2 ] x . Crystals of [Fe 3 (imid) 6 (imidH) 2 ] x are monoclinic, a = 10.5912(9), b = 12.958(2), c = 10.617(1) Å; β = 92.696(9)°; Z = 2; space group P 2 1 / c . The structure was solved by Patter…
Nuclear magnetic resonance and electrical conductivity measurements are conducted to study the dynamics of the ionic diffusion process in the crystalline ionic conductor ${\mathrm{Li}}_{0.5}{\mathrm{La}}_{0.5}{\mathrm{TiO}}_{3}.$ dc conductivity shows a non-Arrhenius temperature dependence, similar to the one recently…
Different from the conventional use of charged supports, the assembly of thin coatings by alternate adsorption of oppositely charged polyelectrolytes was realized on a variety of uncharged standard polymers, such as poly(propylene), poly(styrene), poly(methyl methacrylate), and poly(ethylene terephthalate). For the mu…
We report the deliberately controlled growth of epitaxial metallic oxide SrRuO3 thin films in three distinctly different growth modes. Scanning tunneling microscopy and x-ray diffraction indicate that the growth mechanism for films on exact (001) SrTiO3 substrates is two-dimensional nucleation, which results in a two…
We present a new model for the gas amplification effect used in many environmental scanning electron microscopes, wherein molecular complexity is shown to be the critical factor. Monte Carlo simulations, based on experimental electron scattering cross‐sections, are used to deduce a predictive model for the amplificati…
We investigated the ferroelectric behavior in novel ferroelectric liquid crystals consisting of banana-shaped achiral molecules. Under the application of a triangular-wave electric field, we observed a single peak corresponding to the switching current in the higher-order smectic ( SmX 2 ) phase as well as the smectic…
In this Part I of a two‐part study of Hertzian indentation in silicon nitride we characterize irreversible contact damage as a function of microstructure. Three controlled silicon nitride microstructures are examined, representing a progression toward greater long‐crack toughness: fine (F), bimodal with predominantly…
Sputtered Ba1−xSrxTiO3 (BST) and SrTiO3 (STO) films and capacitors made with these dielectrics have been characterized with respect to physical and electrical properties. Specific capacitance values included a high of 96 fF/μm2 for BST films deposited of 600 °C and a high of 26 fF/μm2 for STO films deposited at 400 °C…
The resistivity and magnetization of layered perovskite ${\mathrm{La}}_{2\ensuremath{-}2x}{\mathrm{Ca}}_{1+2x}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ have been studied systematically using bulk samples with a wide doping concentration range $0<~x<~0.5$ and epitaxial thin film samples with $x=0.3.$ The system becomes…
Starburst PAMAM dendrimers ending with mannopyranoside residues were readily synthesized in large scale and good yields from commercially available dendrimers bearing high-density amine functionality on their surface and p-isothiocyanatophenyl 2,3,4,6-tetra-O-acetyl-alpha-D-mannopyranoside. The first four generations…