Materials Literature
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Highly selective syntheses of tri(2,4-dimethyl-3-carbethoxypyrrolyl)-methane 8 and its dipyrrolic intermediate 6 and pyrrolic one 1 are described based on the successful correction of the wrong process for 1 in literature. Tripyrrolic compounds have attracted much attention recently and been developed in diverse field…
Effects of alloy addition on magnetic anisotropies in non-grain oriented electrical steels were investigated. Tin and antimony improved magnetic induction and iron loss but increased anisotropy of magnetic induction and lessened anisotropy of iron less. Texture effect was evaluated as texture factor expressing as a ra…
The effect of phosphorus (P) on magnetic properties and also on recrystallization texture of non-oriented electrical steel sheets has been investigated to develop core materials with low core loss and high permeability. Specimens containing different amounts of P were cold-rolled to various thicknesses, i.e. with vari…
A range of complex nanostructures have been observed by the self-assembly of carbon nitride nanocrystals, which involved an increase of the structural complexity from 0D → 1D → 2D → 3D evolution.
Gel combustion synthesis was investigated on rare earth aluminates, especially gadolinium aluminate, by adjusting Gd/Al ratios in mixed nitrate aqueous solution and the kinds of fuel. Use of urea as the fuel was essential to obtain the crystallized oxides as the combustion products in any Gd/Al compositions although g…
New type of detection system has been designed and tested in the Scanning Electron Microscope. Backscattered electrons (BSE) at low energies of electron impact are collected by an annular detector above the specimen, consisting of eight concentric ring-shaped collectors arranged around the optical axis so that polar a…
The low temperature magnetic properties of Pb2MnO4, which crystallises in an acentric but non-polar space group (P21c) that allows piezoelectricity, have been investigated. Magnetisation measurements reveal a sharp transition to an antiferromagnetically ordered state at 18 K. Powder neutron diffraction at 1.5 K shows…
層間陰イオンの異なる4種類のMg/Al系ハイドロタルサイト様化合物（HT）をMg/Al=2.5の条件下で共沈法により合成し，得られたHTのpH緩衝作用について検討した．4種類のHTのpH緩衝作用により，Mg–Al–SO42−HT(pH 9.0)>Mg–Al–CO32−HT(pH 8.5)>Mg–Al–NO3−HT(pH 8.0)>Mg–Al–Cl−HT(pH 7.6)の順に高いpHで一定になる．2価の陰イオンを取り込んだMg–Al–SO42−HT，Mg–Al–CO32−HTは，1価の陰イオンを取り込んだMg–Al–Cl−HTとMg–Al–NO3−HTと比べて，緩衝作用により高いpH値を示す．これは，HT中からSO42−やCO32−…
We present an empirical model based on the solubility of zinc and temperature to explain the observed variations in density and length of hydrothermally grown zinc oxide ͑ZnO͒ nanorods on GaN substrate as reported by Le et al. ͓J.Cryst.Growth, 293, 36 ͑2006͔͒.The ionic equilibrium of the growth solution is solved nume…
For the first time a comparative study of holographic recording in planarly oriented films of nematic and cholesteric azobenzene‐containing polymers was performed. The influence of temperature and light intensity on the values of diffraction efficiencies of holographic gratings was investigated. The kinetics of gratin…
We report on the experimental observation of surface plasmon resonance in Cu nanowires fabricated by shadow deposition method. When the incident light is polarized perpendicular to the wire axes, plasmon maxima appeared at about 2.3 eV in the absorption spectra. Plasmon resonance appeared at lower photon energy when t…
Dynamic in situ spectroscopic ellipsometry is used to probe post-deposition nano-structural changes in silver films at room temperature in the pre- and post-coalescence stages of Volmer-Weber growth. In the island growth phase the Maxwell-Garnett theory is used to determine structural changes in the island film. Chang…
Templated self-assembly of nucleotide bolaamphiphile 1 (in which a 3'-phosphorylated thymidine moiety is connected to each end of a long oligomethylene chain) with a 10-, 20-, 30-, or 40-meric single-stranded oligoadenylic acid (2, 3, 4, or 5) led to the formation of right-handed helical nanofibers in 0.1x Tris/EDTA (…
CaCO3 was synthesized under various basic conditions through carbonation reaction. CO2 gas was blown into calcium hydroxide solution and the reaction pH was controlled constantly with NH4OH and KOH aqueous solution at specific levels which are 12.5, 11.5, 10.5, 9.5 and 8.5. Each sample prepared was analyzed with X-ray…
La 0.67 Ca 0.33 Mn O 3 − δ ∕ Nb – Sr Ti O 3 p-n junction was fabricated by pulsed laser deposition. The I-V curves of this junction show rectifying behavior. Negative differential resistance (NDR) was observed at low temperatures under large bias voltages and NDR becomes more remarkable with decreasing temperature. In…
Reaction of 1,19-di-unsubstituted b-bilene salts with alpha-ketoesters gives isoporphyrins, and eventually porphyrins, by way of an a,c-biladiene salt intermediate.
Novel two types of Carbon Nano Tube (CNT)-based multiplexers are introduced The first device is a solid-state transmission gate (t-gate) multiplexer that uses CNT as a channel in the Field Effect Transistors (FET) of both n-FET and p-FET types that are used. Because of its very small size, it has been shown that a CNT…
Agricultural and biological engineers have had a leading role in developing drainage design methods that span the range from simple drainage equations to complex computer simulation models. While current efforts are focused on development of complex models to quantify crop and drainage water quality response to design…
While routine Macromolecular x‐ray (MX) crystallography has relied on well established techniques for some years all the synchrotrons around the world are improving the throughput of their MX beamlines. Third generation synchrotrons provide small intense beams that make data collection of 5–10 microns sized crystals p…
<p style="text-align: left">Computer simulated persons (CSPs) today are different in many ways, reflecting various software possibilities and limitations as well as different research interest. Unfortunately, too few of the theories behind thermal manikin simulations are available in the public domain. Many researcher…