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Research on global value chains in the textile and apparel manufacturing industry: from the viewpoint of input-output analysis
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Research on the Affinity between Ligands, Solvents, and Membranes and Its Effect on the Filtration Process of Colloidal Quantum Dot Dispersions
Get PDFWe report the possibility of classification into single nanosized colloidal quantum dots (CQDs) by membrane filtration by considering the affinity balance between ligands, solvents, and membranes. CQDs are expected to have a wide variety of applications in the near future. To realize the social implementation, efficient process technologies for mass production of CQDs have been eagerly awaited. CQDs are easily agglomerated due to the nanosized colloidal particle, so the surface is usually preserved by ligands. On the other hand, size classification is a matter for CQDs because the optical property is closely related to the size of the particle. Recently, various separation and classification methods using porous membranes have been attempted. However, there are few reports about the membrane filtration of nanosized particles in organic solvents such as CQDs. Therefore, the influence of ligands in organic solvents on membrane filtration has not been researched enough. Lack of basic knowledge has been a hurdle to the widespread use of membrane filtration processes in organicsolvent-based dispersions. In this article, the dispersions of CQDs capped by organic and inorganic ligands in various solvents were examined in detail. In addition, the effects of the ligands and solvents on membrane filtration were also investigated. As a result, the CQDs can exist as clusters in the solvent, which has been conventionally known as a good solvent. Moreover, the size of the clusters changed, depending on the affinity between ligands and solvents. By organizing these results based on the idea of the Hansen solubility parameter, we successfully explained agglomeration in the dispersion or adsorption on the membrane. Furthermore, the Hansen solubility parameter of iodide-ligand CQDs was estimated based on the dispersing test of various solvents, and a new mixed solvent for iodide-capped CQDs was discovered for the first time. The experimental results indicate the possibility of membrane filtration of single nanosized CQDs. Based on this study, we suggest optimal filtration conditions for CQD dispersion
The Evolution of Japan's Limited Sovereignty: From the Era of Unequal Treaties to the Japan-U.S. Alliance
Get PDFThis paper examines the evolution of Japan's limited sovereignty across two distinct historical periods: the nineteenth-century era of unequal treaties and the post–World War II era shaped by the Japan–U.S. alliance. In the earlier period, treaties imposed by Western powers curtailed Japan’s jurisdictional and tariff autonomy. Paradoxically, these constraints catalysed rapid modernisation and a national drive to restore sovereign equality. In contrast, the post-war period introduced a different model of limited sovereignty: one characterised by strategic dependence through the Japan–U.S. Security Treaty and the Status of Forces Agreement (SOFA). These legal arrangements grant the United States significant military rights on Japanese territory, including base maintenance and jurisdictional authority, raising ongoing concerns about Japan’s territorial and legal autonomy. Further tensions arise from the opaque operation of the Japan–U.S. Security Consultative Committee, whose limited transparency and perceived imbalance in representation have prompted criticism regarding undue U.S. influence. Evolving regional security dynamics and potential shifts in U.S. foreign policy further complicate Japan’s sovereignty posture. Additionally, growing secrecy surrounding national security and the technical nature of defence policy hinder public deliberation and raise broader questions about democratic accountability. Employing an interdisciplinary framework that draws from international law, political science, and history, this study analyses the legal instruments and socio-political contexts that shaped these two periods. By comparing externally imposed and internally accepted constraints on sovereignty, the paper contributes to a deeper understanding of how nations negotiate autonomy within global power structures. This analysis, grounded in a comprehensive review of English and Japanese scholarship, offers a nuanced perspective on Japan’s evolving relationship with limited sovereignty and its implications for democratic governance and strategic positioning in East Asia
Dynamics of urban commons movements: A case study on the Gyeonguirailway commons movement(2016~2020) in Seoul, Korea
Get PDF横浜国立大学博士（学術）Doctor of Philosophyこの学位論文の全文は、中央図書館で平日17時までに申請することで閲覧が可能です。The full text of this thesis is available for viewing at the Central Library upon request by 5:00 p.m. on weekdays
A study on the framework of architectural design education incorporating the information integration function of BIM－Development of environmental design education programs in universities－
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Development of quantification method of contact opportunities among local residents generated by public transportation
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