Mechanochemical Synthesis of Active Magnetite Nanoparticles Supported on Charcoal for Facile Synthesis of Alkynyl Selenides by C−H Activation

Magnetite (Fe3O4) nanoparticles supported on charcoal, graphene, or SBA‐15 were prepared by a simple solid‐state grinding technique and subsequent thermal treatment. The Fe3O4 nanoparticles supported on activated charcoal exhibited high catalytic activity and furnished good yields of the alkynyl selenide product in the cross‐coupling reaction of diphenyl diselenide and alkynes through activation of C−H and Se−Se bonds under ecofriendly conditions, surpassing traditional copper‐based catalysts to effect the same organic transformation.Alkynes of fun: Fe3O4 nanoparticles separately supported on charcoal, graphene, and SBA‐15 are prepared by solid‐state grinding and subsequent thermal treatment. The Fe3O4 nanoparticles supported on activated charcoal exhibit high catalytic activity and furnish good yields of alkynyl selenide products in the cross‐coupling reactions of diphenyl diselenide with alkynes through C−H and Se−Se bond activation under ecofriendly conditions.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/137502/1/cctc201600280-sup-0001-misc_information.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/137502/2/cctc201600280_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/137502/3/cctc201600280.pd

Flow in multitasking : the effects of motivation, artifact, and task factors

textThe aims of this dissertation study are 1) to examine how the interplay of motivation, artifacts, and task interconnectedness affect users' flow experience, 2) to understand users' multitasking patterns by analyzing approaches and strategies in multitasking environments through a participatory design session, and 3) to come up with design insights and implications for desired multitasking environments based on findings from the quantitative and qualitative data analysis and synthesis. This dissertation employed the PAT (Person-Artifact-Task) model to examine factors that affect users' flow experience in computer-mediated multitasking environments. Particularly, this study focused on users' flow experience - sense of control, focused attention, curiosity, intrinsic interest and interactivity - in the context of multitasking. The dissertation begins with perspectives on human multitasking research from various disciplines. Emphasis is placed on how researchers have defined the term multitasking and the scope of previous multitasking research. In addition, this study provides definitions of the term task switching, which also has been used to describe human multitasking. The second section of this dissertation focuses on the literature, which characterizes factors and theoretical frameworks of human multitasking research. In this section, human multitasking factors were classified into internal and external factors to analyze factors from the micro to the macro perspective. More detailed definitions and comparisons are also addressed. To summarize and conclude the literature review, this study provides a synthesis framework of internal and external factors of human multitasking contexts. In section III, this dissertation introduces theoretical frameworks that include the constructs of the PAT (Person-Artifact-Task) model and flow model. The next three sections present the research design and two research methods - the experiment and participatory design. The results and discussion section includes the implications of interpreting people's flow experience with motivation, artifact (technology affordance type), and task interconnectedness through the PAT model. The study findings and implications should extend our understanding of multitasking behaviors and contexts and how the interplay of person, artifact, and task factors affects humans' flow experience. A concluding chapter explores future work and design implications on how researchers and designers can take contextual factors into consideration to identify the most effective multitasking in computer-mediated environments.Informatio

Optimal design of quadratic electromagnetic exciter

The vibration acceleration of collecting plates, which is the core indicator of rapping performance in an electrostatic precipitator’s vibration rapping process, is determined by magnetic force of a quadratic electromagnetic exciter. The larger exciter provides the larger magnetic force, but the installation space for the exciter is limited. Accordingly, this paper presents the optimal design of quadratic electromagnetic exciter to maximize the magnetic force with constraint that the size of exciter is constant. A design optimization problem was formulated in order to find the quadratic electromagnetic exciter shape parameters that maximized the magnetic force. The magnetic force of the quadratic electromagnetic exciter was evaluated using the commercial electromagnetic analysis software “MAXWELL”. For efficient design, we employed metamodel-based design optimization using design of experiments (DOE), metamodels, and an optimization algorithm equipped in PIAnO (Process Integration, Automation and Optimization), a commercial PIDO (Process Integration and Design Optimization) tool. Using the proposed design approach, the optimal magnetic force was increased by 1.68 % compared to the initial one. This result demonstrates the effectiveness of the established analysis and design procedure for the quadratic electromagnetic exciter

An Exploratory Study on the Association Between Social Capital and Self-Rated Health of South Korean Women with Disabilities

The purpose of this chapter was to explore the relationship between social capital and self-rated health status as assessed in the activities of the everyday life of South Korean women with disabilities. For this purpose, the authors analyzed the 8th data of the panel survey of employment for the disabled (PSED) that included a sample of 275 women with disabilities who are paid worker. The authors found that working environment, working hours, personal development possibilities, communication-and interpersonal-relationships, the fairness of performance assessment, welfare benefits, training opportunities, and job satisfaction differed significantly in relation to the self-rated health status of women with disabilities. The authors also found that for working hours, communication, and interpersonal relationships, significantly higher self-rated health status was found for satisfied compared to the satisfaction group. For personal development possibilities, welfare benefits, and training opportunities, self-rated health status was significantly higher for the satisfaction group than the dissatisfied group. For fairness of the performance assessment, self-rated health status of the satisfaction group was significantly higher than in the dissatisfied and the normal group. Therefore, in order to improve the self-rated health of South Korean women with disabilities, it is necessary to provide working environment considering their disability characteristics and various training opportunities in their workplace

An existential reading of Camus and Dostoevsky focusing on Camus's notion of the absurd and Sartrean authencity

Albert Camus (1913-1960) describes morally corrupted society in his later fiction, The Fall (1956), yet, seeks to find authenticity to share the suffering of others to establish communal bonds and responsibility, specifically revealed in "The Growing Stone" (1957). Camus frequently denies his alignment with existentialism; yet, in his major novels, he frequent portrays a dark side of human existence: a sense of weariness with the habitual aspects of daily life and a keen awareness of the absurd lead Camusian heroes to complete nihilism and utter despair, which shows Camus's strong affinity with existentialist ideas. Further investigation of Dostoevsky's anti-hero, the underground man, and the demigod Kirilov reveals that Dostoevsky's vision of kingdom is not so optimistic in spite of dominant thematic concern of Christian resurrection and eternal life in Dostoevsky's major works. Only moral anarchy and spiritual sterility coexist in his kingdom. I, thus, investigate Dostoevksy's unique approach to existence without God, in which he eventually declares himself to be a forerunner of existentialism. Camus does, in fact, recognize Dostoevsky as an important predecessor. In particular, Camus examins Dostoevsky's depiction of alienated characters rebelling against the world as they understand it. Thus, in Chapter I, my focus lies in a discussion of the theory of the absurd, with Camus's The Myth of Sisyphus as a valuable supplement that opens the way for an existential approach to Camus's literary production. Having identified our condition of absurdity as a dilemma requiring a response, Camus (and our study) turns to Dostoevsky's reflections on modern antiheroes. In Chapter II, keeping my attention on The Myth of Sisyphus, I explore Dostoevsky's fictional character, Kirilov, of The Demons. Along the same lines, in Chapter III, I investigate Jean-Baptiste Clamence of The Fall (1956), with respect to the underground man in Dostoevsky's Notes from Underground (1864). Dostoevsky's two pre-existential works, however, fail to provide protagonists who possess authentic selfhood. Their rebellions are ultimately failures. Thus, I analyze D'Arrast of "The Growing Stone," in Exile and Kingdom (1958), who ultimately glimpses a potential for human solidarity and freedom in the fundamental structure of the human personality and social existence. This marks Camus's fullest expression of a response to a fundamental human dilemma which Dostoevsky's fiction helped him to grasp more fully

Infrastructure development focusing on effctive structuring public-private partnership.

Thesis(Master) --KDI School:Master of Public Policy,2014masterpublishedHyunJi Park

Human dopamine receptor nanovesicles for gate-potential modulators in high-performance field-effect transistor biosensors

The development of molecular detection that allows rapid responses with high sensitivity and selectivity remains challenging. Herein, we demonstrate the strategy of novel bio-nanotechnology to successfully fabricate high-performance dopamine (DA) biosensor using DA Receptor-containing uniform-particle-shaped Nanovesicles-immobilized Carboxylated poly(3,4-ethylenedioxythiophene) (CPEDOT) NTs (DRNCNs). DA molecules are commonly associated with serious diseases, such as Parkinson's and Alzheimer's diseases. For the first time, nanovesicles containing a human DA receptor D1 (hDRD1) were successfully constructed from HEK-293 cells, stably expressing hDRD1. The nanovesicles containing hDRD1 as gate-potential modulator on the conducting polymer (CP) nanomaterial transistors provided high-performance responses to DA molecule owing to their uniform, monodispersive morphologies and outstanding discrimination ability. Specifically, the DRNCNs were integrated into a liquid-ion gated field-effect transistor (FET) system via immobilization and attachment processes, leading to high sensitivity and excellent selectivity toward DA in liquid state. Unprecedentedly, the minimum detectable level (MDL) from the field-induced DA responses was as low as 10 pM in real- time, which is 10 times more sensitive than that of previously reported CP based-DA biosensors. Moreover, the FET-type DRNCN biosensor had a rapid response time (<1 s) and showed excellent selectivity in human serum