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MEGAMASER DISKS REVEAL A BROAD DISTRIBUTION OF BLACK HOLE MASS IN SPIRAL GALAXIES
Greene, J. E.,Seth, A.,Kim, M.,Lä,sker, R.,Goulding, A.,Gao, F.,Braatz, J. A.,Henkel, C.,Condon, J.,Lo, K. Y.,Zhao, W. American Astronomical Society 2016 ASTROPHYSICAL JOURNAL LETTERS - Vol.826 No.2
<P>We use new precision measurements of black hole (BH) masses from water megamaser disks to investigate scaling relations between macroscopic galaxy properties and supermassive BH mass. The megamaser-derived BH masses span 10(6)-10(8) M-circle dot, while all the galaxy properties that we examine (including total stellar mass, central mass density, and central velocity dispersion) lie within a narrower range. Thus, no galaxy property correlates tightly with M-BH in similar to L* spiral galaxies as traced by megamaser disks. Of them all, stellar velocity dispersion provides the tightest relation, but at fixed sigma* the mean megamaser M-BH are offset by -0.6 +/- 0.1 dex relative to early-type galaxies. Spiral galaxies with non-maser dynamical BH masses do not appear to show this offset. At low mass, we do not yet know the full distribution of BH mass at fixed galaxy property; the non-maser dynamical measurements may miss the low-mass end of the BH distribution due to an inability to resolve their spheres of influence and/or megamasers may preferentially occur in lower-mass BHs.</P>
Crack mapping in RC members using distributed coaxial cable crack sensors: modeling and application
Greene, Gary Jr.,Belarbi, Abdeldjelil,Chen, Genda Techno-Press 2005 Smart Structures and Systems, An International Jou Vol.1 No.4
The paper presents a model to calculate reinforcement strain using measured crack width in members under applied tension, flexure, and/or shear stress. Crack mapping using a new type of distributed coaxial cable sensors for health monitoring of large-scale civil engineering infrastructure was recently proposed and developed by the authors. This paper shows the results and performance of such sensors mounted on near surface of two flexural beams and a large scale reinforced concrete box girder that was subjected to cyclic combined shear and torsion. The main objectives of this health monitoring study was to correlate the sensor's response to strain in the member, and show that magnitude of the signal's reflection coefficient is related to increases in applied load, repeated cycles, cracking, and reinforcement yielding. The effect of multiple adjacent cracks, and signal loss was also investigated. The results shown in this paper are an important step in using the sensors for crack mapping and determining reinforcement strain for in-situ structures.
Crack mapping in RC members using distributed coaxial cable crack sensors: modeling and application
Gary Greene, Jr.,Abdeldjelil Belarbi,Genda Chen 국제구조공학회 2005 Smart Structures and Systems, An International Jou Vol.1 No.4
The paper presents a model to calculate reinforcement strain using measured crack width in members under applied tension, flexure, and/or shear stress. Crack mapping using a new type of distributed coaxial cable sensors for health monitoring of large-scale civil engineering infrastructure was recently proposed and developed by the authors. This paper shows the results and performance of such sensors mounted on near surface of two flexural beams and a large scale reinforced concrete box girder that was subjected to cyclic combined shear and torsion. The main objectives of this health monitoring study was to correlate the sensor response to strain in the member, and show that magnitude of the signal reflection coefficient is related to increases in applied load, repeated cycles, cracking, and reinforcement yielding. The effect of multiple adjacent cracks, and signal loss was also investigated. The results shown in this paper are an important step in using the sensors for crack mapping and determining reinforcement strain for in-situ structures.
The Game People Played: Mahjong in Modern Chinese Society and Culture
Maggie Greene 고려대학교 민족문화연구원 2015 Cross-Currents Vol.- No.17
This article considers the discourse surrounding the popular Chinese table game of mahjong in the nineteenth and twentieth centuries, using it as a barometer to trace social and cultural changes during the late Qing and Republican periods. After analyzing the connection between mahjong; its forerunner, madiao; and their antithesis, weiqi (go), it traces the changing position of mahjong in Chinese society from a game seemingly loathed by literati to a staple of bourgeois parlors. Drawing on a variety of journals, newspapers, and visual sources, the article further explores culture from class and gender perspectives in the late Qing and Republican periods, as mahjong moved from a visibly male activity to one largely associated with women. Finally, it considers the relationship between games and discourses of modernity, and the important changes taking place regarding leisure time in the twentieth century. The article argues that mahjong has been uniquely resistant to regulation and control. Enjoyment of the game spread across class and gender lines, despite the efforts of reformers, for reasons that reflect and embody key shifts from the late Qing dynasty through the end of the Republican period.
The reflective trio: A model for collaborative self-study in teacher education
William L. Greene,Younghee M. Kim,Joan L. Marioni 한국교육개발원 2007 KEDI Journal of Educational Policy Vol.4 No.1
This study examines how participation in a faculty reflection group over a two-year period affected members’ views of their teaching and the learning of their students. Three questions provide the basis for data collection and analysis: 1) How does collegial support and coaching promote open discussion of our own teaching and learning? 2) What particular cognitive and emotional needs do we have as teacher educators? 3) And are we modeling the constructivist philosophy of our program for our students? Through a series of scheduled and unscheduled meetings and teaching observations, data sources include audiotape recordings, field notes, and personal-journal reflections. In their findings, the authors share what they learned, discuss personal goals that surfaced through their collaboration, and identify strategies to help them meet these goals. Characteristics of the reflective-trio model are explicated for possible use and adaptation by others and may be of particular interest to new faculty or beginning teachers at any level.