共有結合性ネットワークを持つ新規鉄系超伝導体の設計と合成

学位の種別: 課程博士審査委員会委員 : （主査）東京大学教授 岸尾 光二, 東京大学教授 宮山 勝, 東京大学教授 幾原 雄一, 東京大学講師 荻野 拓, 産業技術総合研究所上級主任研究員 伊豫 彰University of Tokyo(東京大学

Capital Taxation in a Large Open Economy

This paper examines the effects of capital taxation in a large open economy, using an overlapping generations model with adjustment costs in capital installation. Taxes on returns on savings and on profits are considered. It is shown that the introduction of taxes will reduce the capital stock in the home country, regardless of the current account balance. It is also shown that if the country has these taxes initially, then a profit tax increases may raise the capital labor ratio and the wage rate, reducing the foreign asset holdings in the home country

Magnetization and microhardness of iron–chromium alloy films electrodeposited from an aqueous solution containing N, N-dimethylformamide

Iron-chromium (Fe–Cr) alloy films were electrochemically synthesized from an aqueous solution containing N,N-dimethylformamide (DMF). The chromium content of the alloy films increased up to ca. 32 at%, with an increase in the cathodic overpotential during the electrodeposition. Based on the XRD profiles and electron diffraction patterns, it was revealed that the electrodeposited Fe–Cr alloy films have an amorphous nanocrystalline structure. The crystal grain size of the alloys decreased due to an alloying effect of Cr atoms as well as an increase in the nucleation site density of the alloys that were electrodeposited, accompanying a significant overpotential from the stable complex ions. The saturation magnetization of the electrodeposited Fe–Cr alloy films decreased with an increase in the chromium content. On the contrary, the microhardness increased due to the synergistic contribution of solid solution strengthening and crystal grain refinement. The microhardness of the electrodeposited Fe–Cr alloy films reached up to 422.0 kgf/mm2 (HV0.05) and greatly exceeded that of the solidified Fe–Cr alloy ingots

Theoretical study on the roles of family, market, and government

50135290 (科研費)南山大学高齢社会における家庭、市場および国の役割に関する理論的研究 2019～2021年度科学研究費助成事業 (基盤研究 (B) (一般)) 研究成果報告書33917 (科研費)202219H01503 (科研費)research repor

Synthesis and physical properties of Ca1-xRExFeAs2 with RE = La ~ Gd

Synthesis of a series of layered iron arsenides Ca1-xRExFeAs2 (112) was attempted by heating at 1000 C under a high-pressure of 2 GPa. The 112 phase successfully forms with RE = La, Ce, Nd, Sm, Eu and Gd, while Tb, Dy and Ho substituted and RE free samples does not contain the 112 phase. The Ce, Nd, Sm, Eu and Gd doped Ca1-xRExFeAs2 are new compounds. All of them exhibit superconducting transition except for the Ce doped sample. The behaviour of the critical temperature, with the RE ionic radii have been investigated

HIV/AIDS, demography and development: individual choices versus public policies in SSA

Despite the increasing rate of diffusion of effective therapies, the battle against HIV/AIDS in Sub-Saharan Africa (SSA) is far from being over. Three main challenges are that the epidemics might paralyse or reverse the fertility transition, the expansion of the resources needed to finance the fight against HIV, and the emerging resistance to anti-retroviral treatments. This research proposes a UGT-like model showing the complexity of the interplay amongst the (macro)economy, the epidemics, their endogenous feedback on mortality and fertility and the central role of policy actions aimed to fight HIV. The disease-induced increase in adult mortality can hamper economic development by its upward pressure on the precautionary demand for children and downward pressure on education. This can dramatically reduce physical and human capital accumulation