Temperature-insensitive detection of low-concentration nanoparticles using a functionalized high-Q microcavity

The ability to detect nanoparticles in extremely dilute solutions in the presence of environmental noise is crucial for biosensing applications. In this paper we propose a scheme for detecting target nanoparticles through their scattering effects in a high-Q whispering gallery microcavity. The detection signal, defined as the total linewidth broadening of the two new split modes that appear upon nanoparticle adsorption, is highly sensitive and proportional to the nanoparticle concentration. Furthermore, this new method of detection eliminates the requirement for strict temperature control and is capable of distinguishing the signal from the biorecognitions (e.g., antibodies) initially attached to the resonator and that from the target nanoparticles (e.g., antigens)

Where does the dragon’s gift go?: Subnational distribution of China’s aid to Sub-Saharan Africa from 2007 to 2012

As the largest emerging donor, China has seen its bilateral aid increasing at a staggering rate, particularly to Sub-Saharan Africa. Nevertheless, due to a lack of transparency and nonconformity to Western reporting practices, relatively little is known about the motivations, principles and modalities of Chinese aid. This paper makes use of geocoded datasets recently made available by AidData to investigate the subnational distribution of Chinese aid, examining China’s economic interests and poverty in recipient countries as potential determinants of aid received by subnational regions. World Bank aid is used as a benchmark for comparison. While my analysis fails to find a correlation between economic interests and aid, it shows Chinese aid to be consistently less pro-poor than World Bank aid and inadvertently finds a strong tendency for Chinese aid to go into capital cities; both findings support the request-based nature of Chinese aid

現代中国の医療行政 : 「統制」から「予期せぬ放任」へ

学位の種別: 課程博士審査委員会委員 : (主査)東京大学教授 高原 明生, 東京大学教授 城山 英明, 東京大学教授 田辺 国昭, 東京大学教授 樋渡 展洋, 東京大学教授 寺谷 広司University of Tokyo(東京大学