Co-appearance of superconductivity and ferromagnetism in a Ca2_2RuO4_4 nanofilm crystal

By tuning the physical and chemical pressures of layered perovskite materials we can realize the quantum states of both superconductors and insulators. By reducing the thickness of a layered crystal to a nanometer level, a nanofilm crystal can provide novel quantum states that have not previously been found in bulk crystals. Here we report the realization of high-temperature superconductivity in Ca$_2$RuO$_4$ nanofilm single crystals. Ca$_2$RuO$_4$ thin film with the highest transition temperature $T_c$ (midpoint) of 64~K exhibits zero resistance in electric transport measurements. The superconducting critical current exhibited a logarithmic dependence on temperature and was enhanced by an external magnetic field. Magnetic measurements revealed a ferromagnetic transition at 180~K and diamagnetic magnetization due to superconductivity. Our results suggest the co-appearance of superconductivity and ferromagnetism in Ca$_2$RuO$_4$ nanofilm crystals. We also found that the induced bias current and the tuned film thickness caused a superconductor-insulator transition. The fabrication of micro-nanocrystals made of layered material enables us to discuss rich superconducting phenomena in ruthenates

Study on effective instruction method for student teaching (I) : Analysis of the trips in when the student teacher make a teaching plan

広島大学附属福山中・高等学校において実施されている教育実習をより充実させるために，教育実習指導Ｂと中高実習Ⅰ・Ⅱの効果的な指導方法を，３か年にわたり研究していく。この研究を行うことで，今まで指導教員の経験と直感に頼っていた実習生の取組課題に系統性を与えるとともに，指導教員の評価や助言も効果的なものにできると考える。１年次は，教育実習指導Ｂを受講した実習生が指導案作成のどの場面でつまづいているのかを調査するため，実習生へのアンケートをおこない，実習生が作成した指導案を分析した。その結果，多くの実習生が，教材研究の段階でつまづいていることが，明らかになった。また，実習Ｂの指導により，教材研究の段階から授業構成の段階へと，つまづき場面が変化していることも分かった。こうしたつまづきを克服するための，効果的な指導・助言といった手立ての研究をおこない体系化することが，今後の課題である。It lasts for three years and studies an effective instruction method of student teaching instruction B and training I, II to expand student teaching carried out in a high school in Fukuyama attached to Hiroshima University more. I performed the questionnaire to a trainee to investigate it which scene of the teaching plan making the trainee who attended student teaching instruction B tripped in 1 annual and analyzed the teaching plan that a trainee made. As a result, it was revealed that many trainees tripped at the stage of the teaching materials study. In addition, I understood that I tripped from the stage of the teaching materials study on a stage of the class constitution, and a scene changed by instruction of training B

J-REIT（日本型不動産投資信託）における実体的利益調整に関する一考察

application/pd

Oxygen Separation Performance of Ca2AlMnO5+delta as an Oxygen Storage Material for High-Temperature Pressure Swing Adsorption

High-temperature pressure swing adsorption (HT-PSA) is a promising energy-saving approach for oxygen production from air. Ca2AlMnO5+delta, a Brownmillerite-type perovskite, is a promising sorbent for HT-PSA because of its remarkably high oxygen storage capacity (up to 3.3 wt%). In this study, we investigated the redox thermodynamics of Ca2AlMnO5+delta by pressure-composition-temperature (PCT) measurements and investigated the HT-PSA performance of Ca2AlMnO5+delta pellets in a 100 g-scale packed-bed-type reactor. PCT measurements revealed that Ca2AlMnO5+delta can reversibly separate 2.2 wt% of oxygen per cycle under equilibrium conditions between ambient oxygen partial pressure and 5x10-4 MPa at 525 degrees C. However, in a 5 min switching HT-PSA test, Ca2AlMnO5+delta pellets were able to reversibly separate less than 1 wt% oxygen per cycle, which is significantly lower than that estimated from the thermodynamic properties of Ca2AlMnO5+delta. On the other hand, the exothermic oxygen storage and endothermic oxygen release reactions cause significant temperature variation of the packed bed. This study clarifies that, in order to increase the energy efficiency of oxygen separation by HT-PSA, there is a need to compensate for the heat of reaction, which changes the reactor temperature in a direction that interferes with the reaction

Correction to: Purging behaviors relate to impaired subjective sleep quality in female patients with anorexia nervosa: a prospective observational study

Abstract After publication of the original article [1], the authors reported an error to Table 2