Chiba Institute of Technology

About: Chiba Institute of Technology is a education organization based out in Narashino, Japan. It is known for research contribution in the topics: RNA & Magnet. The organization has 2663 authors who have published 4999 publications receiving 56870 citations. The organization is also known as: Chiba kōgyō daigaku & Kōa Institute of Technology.

Development of net-shape cast aluminium-yttrium alloy wires and their solidification structures

Abstract: Cast-aluminium-1.5–7 wt% yttrium alloy wires were produced by the heated mould (Ohno Continuous Casting) process with a typical casting speed of 1.1 m min-1. Using a 2 mm diameter channel bore and positioning the solidification front outside the mould, it was possible to cast wires of 1.6–1.9 mm diameter with uniform chemical composition along the length of the wire. Cast wires contained directionally solidified cells or dendrites of α-aluminium with metastable Al4Y and β-Al3Y phases in intercellular or interdendritic regions. At higher casting speeds (>1.1 m min-1), the predominant metastable phase was found to be Al4Y.

Fast Oxide Ion Conduction Due to Carbonate Substitution in Hydroxyapatite

Abstract: To provide ceramic electrets with superior biocompatibility and controlled surface energy utilizing long-distance ionic conduction under a DC electric field, the conduction property of B-type carbonated apatite (CA) ceramics with various carbonate content was investigated by complex impedance measurements and a concentration cell technique. Infrared spectroscopy and X-ray diffractometry indicated that B-type CA with the composition of Ca10−xNa2x/3(PO4)6−x(CO3)x(H2O)x(OH)2−x/3 (x=ca. 0.87, 1.14, and 1.78, which is identified as CA1, CA2, and CA3, respectively) was prepared. The carbonate content significantly influenced the ionic conductivity (σ) of the obtained CA, which drastically increased from 10−8 to 10−3 S/cm (700°C) in the range between x=0.87 and 1.14. Detection of stable electromotive forces in an oxygen concentration cell using CA1 and CA2 electrolyte (cathode: 5N-graded oxygen gas, anode: nitrogen-balanced 5%–95% oxygen gas) provided strong evidence for oxide ion conduction in B-type CA. Comparison of the obtained electromotive forces (EMFex) with the theoretical ones (EMFth) suggested that the transference numbers for oxide ion conduction in CA1 and CA2 were 0.17 and 1.01, respectively. This result demonstrated that a substitution ratio in excess of one-sixth phosphate ions to carbonate ions (x=1) converted the B-type CA from a proton conductor into an oxide ion conductor.

Rotational bands and signature inversion in odd-odd Re 172

Abstract: High-spin states in the odd-odd $^{172}\mathrm{Re}$ have been investigated via the $^{149}\mathrm{Sm}(^{27}\mathrm{Al},4n\ensuremath{\gamma})^{172}\mathrm{Re}$ reaction through excitation functions, $x\text{\ensuremath{-}}\ensuremath{\gamma}$ and $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidence measurements. A level scheme consisting of three rotational bands has been identified for the first time extending the high-spin studies of $A\ensuremath{\sim}160$ odd-odd nuclei to the currently lightest rhenium isotope. The three bands have been assigned to be built on the $\ensuremath{\pi}{h}_{11∕2}\ensuremath{\bigotimes}\ensuremath{ u}{i}_{13∕2}$, $\ensuremath{\pi}{h}_{9∕2}\ensuremath{\bigotimes}\ensuremath{ u}{i}_{13∕2}$, and $\ensuremath{\pi}1∕{2}^{\ensuremath{-}}[541]\ensuremath{\bigotimes}\ensuremath{ u}1∕{2}^{\ensuremath{-}}[521]$ configurations according to their rotational properties in quasiparticle alignments, signature splitting, in-band $B(M1)∕B(E2)$ ratios, level spacing systematics, band crossing frequencies, as well as the existing knowledge in neighboring nuclei. Low-spin signature inversion has been confirmed in the first two bands due to the observation of signature crossing at high-spin states. The general features of inversion phenomenon in the semidecoupled bands are presented and discussed with reference to theoretical calculations of two quasiparticle plus rotor model including $p\text{\ensuremath{-}}n$ interactions.