many studies have been conducted on the characteristics of hydraulic jumps over horizontal basins. on sloping basins, however, few such studies have been performed so that the issue requires more investigation. a significant number of studies has also been conducted on basins with positive slopes but comparatively few have been carried out on basins with negative slopes. this study was carried ...

Quadrupedal robots working outdoors are very slow robots prone to tumble down in the presence of perturbations. This paper presents a novel gaitadaptation method that enables walking-machine gaits to autonomously adapt to environmental perturbations, including the slope of the terrain, by finding the gait parameters that maximize robot’s dynamic stability. Experiments with the SILO4 quadruped r...

The last several lectures focused on simultaneous single-item auctions, with both secondprice and first-price payment rules. The toolbox we developed for bounding the POA in auctions can also be applied to many other auction formats. In this lecture we revisit an old setting (from Lecture #4) and derive some new insights via this toolbox. Recall the setting of multi-unit auctions with downward-...

Some recent studies have investigated the scale and scope of a remarkable series of late classic prehistoric (est. 1350 CE) water management structures found in Arizona’s upper Gila Valley. These canal systems are characterized by their being literally "hung" on the edges of steep sided, gently sloping mesas formed from remnant Quaternary age bajadas. The mesas today will appear characteristica...

INTRODUCTION Both sorted stone-bordered polygons and nonsorted stone circles were found on a gently sloping, 3000-m-high tableland adjacent to a glaciated valley in the Kharkhiraa Mountains. Neither the formation process nor the physical relationship between the two observed types of patterned ground is clearly understood (Kessler and Werner, 2003). Here I attempt to relate field observations t...

Using an efficiency-wage model, we examine the relationship between indeterminacy and unemployment insurance. It is shown that the less unemployment insurance is, the more likely equilibrium is to be indeterminate. Equilibrium can be indeterminate even without externalities or increasing returns, which makes a sharp contrast to the recent literature on indeterminacy. Our result is based on the ...