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The stiffness of conjugated polymers should lead to chain alignment near buried interfaces, even if the polymer film is nominally amorphous. Although simulations predict that this alignment layer is approximately 1.5 times the persistence length, chain alignment at buried interfaces of amorphous polymers has not been experimentally measured. Using Mueller matrix spectroscopy, the optical response of regiorandom poly(3-hexylthiophene-2,5-diyl) (P3HT) was modeled in order to extract the aligned layer thickness. By approximating the optical properties of the aligned layer as that of regioregular P3HT, the data can be effectively modeled. When the film is thicker than 150 nm, optical properties are best described with a 4-nm aligned layer, which is quantitatively consistent with previous predictions.
Ambidexterity organization, which is defined as the ability of an organization to simultaneously pursues exploration and exploitation, has received attention by researchers who have examined its beneficial effect on organizational performance and success. This study attempted to examine the positive effect of ambidextrous organization culture (AOC), which is regarded as the core characteristic of ambidextrous organizations by using a multilevel model. Specifically, this study examined the effects of AOC on members’ job performance and the mediating role of psychological capital in the relationship between AOC and job performance. The results indicated that AOC had a significantly positive relationship with job performance even after controlling various organizational and individual variables. Moreover, we found that psychological capital fully mediated the relationship between AOC and members’ job performance. This study provides theoretical contributions by empirically examining the positive effect and mechanism of AOC. Furthermore, this study offers practical implications in how practitioners can manage their organizational culture, by helping shape the direction of organizational culture management.
We present generalized theoretical analysis and experimental realization of active quality factor control for the self-oscillating quartz tuning-fork (QTF). The quality factor Q and resonance frequency can be controlled by adding a phase shifted signal of proper gain with respect to the QTF motion. It is demonstrated that the analysis of QTF can be extended to other quartz resonators which are analyzed by an equivalent circuit-a combination of a parallel circuit of an harmonic L-R-C and a stray capacitance C0. Finally, we suggest the prospect of several applications by using the active Q control of QTF such as increasing force sensitivity, reducing scanning time in scanning probe microscopy, and feedback cooling of electromechanical resonator.
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