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An Ecological Approach to Practicum Assessment
Linda Keesing Styles 한국유아교육학회 2000 INTERNATIONAL JOURNAL OF EARLY CHILDHOOD EDUCATION Vol.5 No.-
This paper attempts to identify some of the key issues related to one aspect of the practicum-the theory/practice dichotomy-and to proffer one potential alternative approach based on the experiences of the researcher in an early childhood teacher education program. This alternative is informed by postmodern critiques of curriculum and focuses specifically on ecological principles as an alternative influence on assessment in the practicum. The discussion highlights a number of the issues related to what constitutes theory and how it interacts with practice. Some traditional approaches are challenged and early childhood teacher educators are encouraged to incorporate innovative assessment practices in the practicum.
End Plate–Stiff ener Connection for SHS Column and RHS Beam in Steel-Framed Building Modules
Fu Jia Luo,Chenting Ding,Adam Styles,Yu Bai 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.4
This paper investigates the mechanical performance of beam-to-column connections for steel-framed building modules with RHS and SHS sections of relatively small member sizes. In the experimental program, three forms of connections are tested under static bending, including a completely welded connection (W), a bolted end plate connection (EP) and the proposed end plate–stiff ener connection (ST), and the failure modes, moment–rotation behaviours and strain responses were recorded during experiments. Results show that ST connection exhibited superior connection strength, stiff ness and ductility compared with the EP connection. In addition, a detailed fi nite element analysis was conducted to model the connection behaviours, considering bolt pretension, contact behaviours and detailed bolt geometry, showing good comparison with experiments. Furthermore, a parametric study was performed on the end plate thickness and stiff ener thickness for the proposed end plate–stiff ener connection. Such results fi nally enable a comparative study to investigate the performance of module during road transportation, highlighting the eff ects of connection stiff ness.
Gwalani, B.,Choudhuri, D.,Soni, V.,Ren, Y.,Styles, M.,Hwang, J.Y.,Nam, S.J.,Ryu, H.,Hong, S.H.,Banerjee, R. Elsevier 2017 ACTA MATERIALIA Vol.129 No.-
<P>A detailed investigation of precipitation of the ordered L1(2) (gamma') phase in a Al0.3CrCuFeNi2 high entropy alloy (HEA), more generally referred to as a complex concentrated alloy (CCA), reveals the role of copper (Cu) on stabilization and precipitation of the ordered L1(2) (gamma') phase. Detailed characterization via coupling of scanning and transmission electron microscopy, and atom probe tomography revealed novel insights into Cu clustering within the face-centered cubic matrix of this HEA, leading to heterogeneous nucleation sites for the gamma' precipitates. The subsequent partitioning of Cu into the gamma' precipitates indicates their stabilization is due to Cu addition. The gamma' order-disorder transition temperature was determined to be similar to 930 degrees C in this alloy, based on synchrotron diffraction experiments, involving in situ annealing. The growth and high temperature stability of the gamma' precipitates was also confirmed via systematic scanning electron microscopy investigations of samples annealed at temperatures in the range of 700-900 degrees C. The role of Cu revealed by this study can be employed in the design of precipitation strengthened HEAs, as well as in a more general sense applied to other types of superalloys, with the objective of potentially enhancing their mechanical properties at room and elevated temperatures. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.</P>
Patterning droplets with durotaxis
Style, Robert W.,Che, Yonglu,Park, Su Ji,Weon, Byung Mook,Je, Jung Ho,Hyland, Callen,German, Guy K.,Power, Michael P.,Wilen, Larry A.,Wettlaufer, John S.,Dufresne, Eric R. National Academy of Sciences 2013 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.110 No.31
<P>Numerous cell types have shown a remarkable ability to detect and move along gradients in stiffness of an underlying substrate—a process known as durotaxis. The mechanisms underlying durotaxis are still unresolved, but generally believed to involve active sensing and locomotion. Here, we show that simple liquid droplets also undergo durotaxis. By modulating substrate stiffness, we obtain fine control of droplet position on soft, flat substrates. Unlike other control mechanisms, droplet durotaxis works without imposing chemical, thermal, electrical, or topographical gradients. We show that droplet durotaxis can be used to create large-scale droplet patterns and is potentially useful for many applications, such as microfluidics, thermal control, and microfabrication.</P>