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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Study Of Symbolic Expressions In Peking Opera'scostumes And Lyrics

Li, Yiman 01 January 2008 (has links)
This thesis represents an analysis of symbolic expressions used to convey traditional Chinese cultural values in marital relations as expressed through costumes and lyrics in Peking Opera plays and performances. Two symbols, dragon and phoenix, were selected from the costume collection. Four symbols--bird, tiger, wild goose, and dragon--were selected from compilations of lyrics. These symbols were selected because they expressed Chinese core cultural values, an imperial ideology based on Confucian thoughts, which were practiced rigidly during Qing Dynasty (1644-1911). Modeling Theory is applied to argue that dragon and phoenix as visual symbols convey ideas about characters' background, marital relationship, social status shifts, and socio-culturally desirable values. Social Drama Theory is employed to analyze the lyrics to understand how ideal images of husband and wife are constructed. The archetypes of Chinese traditional culture that have influenced Chinese thought and action for centuries are discovered and discussed.
2

The effectiveness of an intervention to promote active travel modes in early adolescence

Stark, Juliane, Berger, Wolfgang J., Hössinger, Reinhard 05 October 2020 (has links)
This study investigates the changeability of transport-related attitudes and mode choice of early adolescents. Data on attitudes and travel behavior were collected in Austria and Germany in two consecutive survey waves with an interval of one year. The approach is based on a before-after control group experiment with an intervention promoting active travel modes. Based on the Theory of Planned Behavior we used structural equation modeling analyzing effects of the intervention; the potential for behavioral changes was modelled as moderator variable between intention and behavior. Findings suggest that the intervention was effective in changing attitudes, perceived behavioral control (PBC) and intentions to use non-motorized travel modes more, and car less. Difference models show that changes of attitude, subjective norm, and PBC accounted for 29% (car passenger) to 92% (walking) of the variance in changes in intention. The changes in intentions are however weak predictors of changes in reported behavior.
3

Development of a continuum model for ferrogels

Attaran, Abdolhamid, Brummund, Jörg, Wallmersperger, Thomas 25 October 2019 (has links)
A systematic development of a continuum model is presented, which is capable of describing the magneto-mechanical behavior of magnetic polymer gels commonly referred to as ‘‘ferrogels’’. In the present research, ferrogels are treated as multicomponent, multiphase materials. They consist of a polymer network (P), fixed magnetic particles (f), mobile magnetic particles (m), and liquid (L). By considering ferrogels as multicomponent materials, interaction among constituents of ferrogels can be captured. This helps in understanding the process occurring inside ferrogels under the influence of external stimuli, such as magnetic fields. In our modeling approach, the field equations of ferrogels are derived within the framework of the theory of mixtures. The basic equations include Maxwell’s equations, balance of mass, linear momentum, angular momentum, energy, and entropy. In the framework of the theory of mixtures, balance relations are first presented at the constituent level also referred to as partial balance relations. By summing partial balance relations over all constituents and imposing the restrictions of theory of mixtures, balance relations of mixture (for the ferrogel) are obtained. In the current work the specific magnetization (magnetization per density) is considered as an evolving variable. It is demonstrated that balance of angular momentum is satisfied using the evolution equation of specific magnetization and constitutive laws. In the process of modeling, a suitable free energy function is introduced and thermodynamically consistent constitutive laws are formulated. Introducing certain assumptions, a reduced model of the ferrogel, a coupled magneto-mechanical formulation, is subsequently presented. The reduced model consists only of a polymer network (P) and fixed magnetic particles (f). It is concluded that the reduced model compares well to the existing ones in the literature. The magneto-mechanical problem based on the reduced model is solved in 2D using the finite element method. The only unknowns for the finite element method implementation are mechanical displacement and magnetic potential. Deformation of a ferrogel in a magnetic field is subsequently investigated. Elongation and contraction of a ferrogel are observed when a magnetic field is applied in the x- and y-directions, respectively. The numerical results were compared with existing experimental work in the literature. A good qualitative agreement was found between numerical and experimental results.

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