Kouki Sato

Homogeneity range of SnxMo6S8−y at 1000°C and measurement of superconducting critical temperature Tc

Abstract Tin molybdenum sulfides Sn x Mo 6 S 8−y , known as Chevrel phase compound, were prepared by vacuum seal technique at 1000°C and the single phase region was determined. The nonstoichiometric range of tin (x) lied between 0.80 and 1.20, and that of sulfur (8−y) varied between 6.75 and 7.50. A positive relationship obtained between x and (8−y). On the basis of these results, the phase diagram of SnMoS system at 1000°C was established. The rhombohedral lattice parameters were almost constant as a R ⋍ 6.52 A and α R ⋍ 89.8° . It was difficult to find out the compositional dependence of lattice parameters. The superconducting critical temperature Tc of the single phase compounds was measured by using a D.C. four-probe method. Sn 1.10 Mo 6 S 7.00 showed the highest Tc value (Tc−ON = 13.0K, Tc−END = 10.7K). The relationship between Tc and the compositions was discussed.

Topologically slice knots that are not smoothly slice in any definite 4–manifold

We prove that there exist infinitely many topologically slice knots which cannot bound a smooth null-homologous disk in any definite 4-manifold. Furthermore, we show that we can take such knots so that they are linearly independent in the the knot concordance group.

Seleção de ICT na comunicação emocional para estudantes japoneses: focando as estratégias emocionais e diferenças de gêneros

Este artigo descreve a selecao de midia nas comunicacoes emocionais por estudantes universitarios japoneses, especialmente como eles revelam diferencas de generos. Situacoes agradaveis e desagradaveis foram preparadas e os participantes puderam selecionar: face-a-face (F2F), telefone, e-mail de celular, e-mail de PC e carta como meios de comunicacao. Alguns resultados sao apontados no campo do ICT (Information and Communications Technology). A familiaridade com os receptores foi usada como um fator de comunicacao. Para as pessoas familiarizadas, os participantes tenderam escolher a midia baseada na rapidez da replica compartilhando alegrias ou simpatia no momento da comunicacao. Tais decisoes podem ser vistas como uma estrategia emocional na selecao da midia. Participantes quiseram expor suas emocoes para as pessoas familiarizadas o quanto antes e o mais zelosamente possivel. De outro lado, pareceu que repartir emocoes nao foi algo desejado em relacao as receptores nao familiarizados.