Evaluation of the threshold stress for creep deformation in a 3 mol% Y 2 O 3 -stabilized tetragonal ZrO 2 polycrystal

The origin of the increase in the stress exponent from n , 2.0 to with decreasing stress in 3 mol% Y 2 O 3 -stabilized tetragonal ZrO 2 has been examined. The present data show that the increase in the n value arises from the existence of a threshold stress that depends on the grain size and temperature. Careful examination of earlier creep data confirms that evaluation of the threshold stress is sensitive to the accuracy of the creep data and the value of n chosen for the compensation of the data. Inspection of the present results and some recent observations of the deformed microstructure suggests that the threshold stress is associated with intragranular dislocation motion.     

How do shy people expand their social networks? Using social surrogates as a strategy to expand one's network

The authors examined the use of social surrogates by shy people to expand their social network when entering a new environment, following Bradshaw's social surrogate hypothesis. The authors conducted a panel survey of 70 friendship pairs of students 7 months after they entered university. The results revealed that when a friend acted as a surrogate, the shy students extended their joint networks more. In contrast, not-shy students extended their networks regardless of whether a friend acted as a surrogate. These results indicate that even shy people can adjust indirectly to new social circumstances because they can expand their social networks by using a close friend as a surrogate.     

Infrastructuring Amphibious Space: The Interplay of Aquatic and Terrestrial Infrastructures in the Chao Phraya Delta in Thailand

Abstract

The historic flooding that occurred in 2011 in central Thailand revealed fierce struggles over flood protection, which were made particularly complex because of the unruly nature of water itself. The interplay between two forms of infrastructure, each of which shape the flows of water coursing through the Chao Phraya Delta, is key to understanding this complexity. As an ambiguous place in between the sea and land, a delta environment can be seen alternatively as an extension of the sea or as reclaimable land. Constructing infrastructures based on either of these views remakes the landscape accordingly—thus making the landscape more terrestrial or more aquatic. In the Chao Phraya Delta, the terrestrial infrastructure, which consists of road networks and land-based urban living, has been overlaid on a pre-existing aquatic infrastructure characterized by canal transport and flood adaptive architecture. Mainly due to state interest in facilitating water transport, the aquatic infrastructure organized the landscape of the delta until the mid-twentieth century. However, since then the introduction of modern irrigation has progressively rendered the delta landscape more terrestrial. Dry land created by the irrigation system made modern forms of agriculture, commerce and industry possible. While this terrestrial trend seemed to take over the entire delta, the terrestrial infrastructure did not eliminate the aquatic one. Instead it created a dynamic interplay between different forms of infrastructure. The 2011 flood foregrounded the centrality of this interplay in flood protection and sheds new light on the role of the aquatic infrastructure.