Theoretical Analysis of the Reduction of Neel Temperature in La2_{2}(Cu1−x_{1-x}Zn(or Mg)x)_x)O4_{4}

Using Tyablikov's decoupling approximation, we calculate the initial suppression rate of the Neel temperature, $R_{IS}=-lim_{x-> 0} T^{-1}_{N} dT_{N}/dx$, in a quasi two-dimensional diluted Heisenberg antiferromagnet with nonmagnetic impurities of concentration $x$. In order to explain an experimental fact that $R^{(Zn)}_{IS}=3.4$ of the Zn-substitution is different from $R^{(Mg)}_{IS}=3.0$ of the Mg-substitution, we propose a model in which impurity substitution reduces the intra-plane exchange couplings surrounding impurities, as well as dilution of spin systems. The decrease of 12% in exchange coupling constants by Zn substitution and decrease of 6% by Mg substitution explain those two experimental results, when an appropriate value of the interplane coupling is used.Comment: 2 pages, 3 figure

Anisotropic electrical and thermal conductivities of the Al76Co22Ni2 decagonal approximant

The electrical (sigma) and thermal conductivity (lambda) of Al76Co22Ni2decagonal approximant has been measured along three orthogonaldirections a*, b and c of the Al76Co22Ni2 unit cell, where (a, c)monoclinic atomic planes are stacked along the perpendicular bdirection. Electrical conductivity is relatively high in all crystallinedirections, appearing in the order sigma(b) >> sigma(c) > sigma(a*).Thermal conductivity appears in the same order lambda(b) > lambda(c) >lambda(a*), So that b is the most conducting direction for bothelectricity and heat. The results are compared to the reportedanisotropic electrical and thermal conductivity of the d-Al-Ni-Codecagonal quasicrystal

Stefano Donaudy 作曲 Robert Bracco 劇原作 Alberto Donaudy 脚本 SPERDUTI NEL BUIO 第1幕 『闇に紛れて』

本訳稿は、Stefano Donaudy 作曲 "SPERDUTI NEL BUIO : Opera completa per canto e Pianoforte", G. RICORDI & Co., 1906, pp.1-122(第1幕)を全訳したものである

Topological surface states hybridized with bulk states of Bi-doped PbSb2Te4 revealed in quasiparticle interference

Topological surface states of Bi-doped PbSb2Te4 [Pb(Bi0.20Sb0.80)2Te4] are investigated through analyses of quasiparticle interference (QPI) patterns observed by scanning tunneling microscopy. Interpretation of the experimental QPI patterns in the reciprocal space is achieved by numerical QPI simulations using two types of surface density of states produced by density functional theory calculations or a kp surface state model. We found that the Dirac point (DP) of the surface state appears in the bulk band gap of this material and, with the energy being away from the DP, the isoenergy contour of the surface state is substantially deformed or separated into segments due to hybridization with bulk electronic states. These findings provide a more accurate picture of topological surface states, especially at energies away from the DP, providing valuable insight into the electronic properties of topological insulators.Comment: 7+8 pages, 4+5 figure

HIP AND LUMBOSACRAL JOINT CENTRE LOCATIONS IN ASIAN POPULATION: BIASES BY EXISTING REGRESSIONS AND DEVELOPMENT OF NEW METHODS

Accurate prediction of the lumbosacral and hip joint centres (LSJC, HJC) is crucial for the analysis of lumbo-pelvic-hip dynamics in various movements. Here we show that pre-existing regressions proposed by European research groups produce biased estimates of the LSJC and HJC in Japanese males and females (n = 23, 24), and that the biases in LSJC depend on sex. When compared to locations directly measured by MRI, the pre-existing regressions estimated the LSJC to be more posterior in males and more inferior and posterior in females, and the HJC to be more medial for both sexes. We suggest the importance of considering racial and sexual differences in morphology. We propose new regressions for Asians and validate them using leave-one-out cross-validation. Our regression can be a powerful solution for accurate motion analysis in Asians

Beginning vocal students’ learning of classical Italian songs: The process of learning

This study aimed to capture the reality of the learning process and to derive suggestions for future instruction based on the descriptions in the learning records of first-year university students taking vocal music classes. The descriptions can be classified into eight categories. (1) recognition of the situation, (2) mental state, (3) the basic content of vocal music, (4) understanding of classical Italian works and musical expression, (5) Italian pronunciation, (6) ensemble with piano, (7) learning from the appearance of others, and (8) connections with existing learning. We were able to capture aspects of the learners’ learning that became more concrete and developed as the number of lessons increased. We found that the learners deepened their learning systematically as they repeated the lessons according to their situations. Recognition of their achievements seemed to lead to motivation and higher learning. In addition, there were not many descriptions of their recognition of their achievements. The learners’ descriptions of the lessons on classical Italian songs indicated that they were given a wide range of content, but in addition, giving the learners a greater sense of “having done it” would lead to further acquisition of knowledge