京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第21073号 / 工博第4437号 / 新制||工||1690(附属図書館) / 京都大学大学院工学研究科分子工学専攻 / (主査)教授 佐藤 啓文, 教授 関 修平, 准教授 伊藤 彰浩, 教授 梶 弘典 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM

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京都大学 / 新制・課程博士 / 博士(工学) / 甲第24233号 / 工博第5061号 / 新制||工||1790(附属図書館) / 京都大学大学院工学研究科材料化学専攻 / (主査)教授 三浦 清貴, 教授 田中 勝久, 教授 藤田 晃司 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM

<p> New metal-rich Gd5T4 magnetocaloric phases (T - p-element) were designed, synthesized and characterized. These phases exhibit a close relationship between the valence electron count, size effect, crystal structure and physical properties. The targeted cleavage of the interslab T-T dimers was achieved in the Gd5Si4-xPx, Gd5Si4-xSbx and GdsSi4_xBix systems. While in the Gd5Si4-xPx system only a change in the valence electron count was employed for the desired structural transformations, in the Gd5Si4-xSbx and Gd5Si4-xBix systems both the valence electron count and size effect were used to break the interslab dimers. Incorporation of large Bi atoms into the Gd5Si4 phase resulted in the complete cleavage of the interslab T-T bonds and lead to novel slab stacking sequences accompanied by stacking faults. </p> <p> The Gd5Si4_xPx and Gd5Si4-xSbx phases undergo ferromagnetic transitions within a wide temperature range. Values of the corresponding magnetic entropy changes indicate the presence of a conventional magnetocaloric effect. This is likely due to the temperature stability of the structures with the broken dimers which hinders first-order coupled magnetostructural transitions. </p> <p> Metal-rich ferromagnetic phases of the RE5NixT3-x composition with RE = Gd, Dy, Lu, T = Sb, Bi were derived from the parent RE5T3 binaries. Incorporation of nickel stabilizes the orthorhombic Yb5Sb3-type structures at 800 °C. The Gd5Ni0.96Sb2.04, Gd5Ni0.71Bi2.29 and Dy5Ni0.66Bi2.34 phases show relatively low values of magnetocaloric effect. </p> / Thesis / Doctor of Philosophy (PhD)

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The National Institute of Mental Health (NIMH) has provided a framework for studying psychopathology known as the Research Domain Criteria (RDoC), which conceptualizes depression and other mental disorders on a continuum of levels of analysis, ranging from molecular dysfunction to impairment in cognitive systems indexed by behavioral paradigms. Within the RDoC, these units of analysis and their corresponding normal-to-abnormal functioning can be placed within six domains: (1) negative valence systems; (2) positive valence systems; (3) cognitive systems; (4) social processes; (5) arousal and regulatory systems; and (6) sensorimotor systems. Given the recent emphasis on identifying further mechanisms associated with positive valence systems dysfunction, the present study aimed to assess the relationship between various behavioral paradigms (indexing perception, attention, affective working memory updating, and effort expenditure) and various conceptualizations of anhedonia, a heterogeneous, transdiagnostic symptom implicated as a core component within this domain. Participants (N = 101) with a range of depressive symptoms were recruited for a longitudinal study and completed six weekly in-person sessions, as well as a follow-up session that occurred approximately six weeks after the last session. Findings suggest there were no robust associations between these behavioral paradigms and various self-report measures of anhedonia, contrasting with previous empirical findings. As such, future studies are warranted to continue assessing these possible mechanisms of positive valence systems disturbance.

The minority stress theory proposes that higher rates of mental illness among individuals who identify as lesbian, gay, or bisexual result from various factors that one may experience as a function of their minority status (Meyer, 1995, 2003). Such factors include internalized homophobia, concealment of one’s sexual identity, and the experiences of discrimination and rejection, whether real or perceived. This study investigated the relationship between minority stress and working memory. Based on the well documented research finding of the higher prevalence of mental illness among individuals who identify as lesbian, gay, or bisexual, relative to their heterosexual counterparts (S. D. Cochran, Sullivan, & Mays, 2003; Hatzenbuehler, 2009; Mays & Cochran, 2001), it was hypothesized that higher levels of minority stress would predict higher levels of psychological distress. In addition, models of chronic stress have predicted that individuals who are under constant stress conditions are more likely to have working memory deficits (Egeland et al., 2005; Schmader & Johns, 2003). Thus, it was hypothesized that the relationship between minority stress and working memory would be mediated by psychological distress. Identity valence is the evaluation of one’s identity and could be either positive or negative (Ashmore, Deaux, & McLaughlin-Volpe, 2004; Meyer, 2003). It was hypothesized that identity valence would further mediate the relationship between minority stress and working memory. Participants included 309 adults who identify as lesbian, gay, or bisexual (LGB), recruited via community-based and snowball sampling techniques (Meyer & Colten, 1999; Meyer & Wilson, 2009). Structural equation modeling (SEM) was utilized to examine direct and indirect effects of the relationship between minority stress and working memory. Results indicated that higher levels of working memory predict higher levels of psychological distress. Further, the relationship between minority stress and working memory was mediated through psychological distress and rumination. Finally, identity valence did not have the protective factor that was hypothesized and demonstrated in previous literature (Kertzner, Meyer, Frost, & Stirratt, 2009; Meyer, 2003). Rather, higher levels of identity valence predicted higher levels of psychological distress. Implications, strengths, limitations, and directions for future research are discussed. / School Psychology