Synthesis of a bowl-type dodecavanadate by the coupling reaction of alkoxohexavanadate and discovery of a chiral octadecavanadate

金沢大学理工研究域物質化学系A new route to an alkoxohexavanadate species leads to the isolation of a bowl-type dodecavanadate without a guest molecule in the cavity. The 1D tetravanadate, [V4O11]2-, is a good precursor for the alkoxohexavanadate, [V6O13(OCH3)6]2-, which is then utilized for the [V6 + V6] coupling reaction to form the dodecavanadate, [V12O42]4-, with a capped dichloromethane molecule at the cavity entrance. We also obtained structural information on a newly discovered octadecavanadate, [V18O46(NO3)]5-, in both the solid and solution states through extended X-ray absorption fine structure (EXAFS) studies. The existence of the chiral inorganic species in acetonitrile with double-stranded V8 chains was confirmed through EXAFS oscillations. © 2009 IUPAC

算数科におけるメタ認知の育成 : 社会的相互作用を重視した授業づくりを通して

The purpose of this study is to examine children’s metacognition in primary school mathematics lessons. We developed a "model sheet" of children’s metacognition in each topic of mathematics lessons for designing a lesson and analyzing children’s metacognition in the lesson. As a result of examining mathematics lessons, it was found that there were four main situations in which children tried to develop their metacognition, and that there were five opportunities such as "peer reactions" and "choice of expression method". In addition, the method for designing mathematics lessons which makes use of social interaction was considered may lead to the development of children’s metacognition in mathematics lessons

Wireless, Portable Fiber Bragg Grating Interrogation System Employing Optical Edge Filter

A small-size, high-precision fiber Bragg grating interrogator was developed for continuous plethysmograph monitoring. The interrogator employs optical edge filters, which were integrated with a broad-band light source and photodetector to demodulate the Bragg wavelength shift. An amplifier circuit was designed to effectively amplify the plethysmograph signal, obtained as a small vibration of optical power on the large offset. The standard deviation of the measured Bragg wavelength was about 0.1 pm. The developed edge filter module and amplifier circuit were encased with a single-board computer and communicated with a laptop computer via Wi-Fi. As a result, the plethysmograph was clearly obtained remotely, indicating the possibility of continuous vital sign measurement