NOBODY knows when, where or how speech originated, and I am stepping in where wise scholars in linguistics and psychology fear to tread. My colleagues in psychology will, I beg, permit this divagation into speculation by one who has labored long in the less exciting fields of experiment and statistics. I ask and expect no mercy from experts in linguistic science, but only that they build a bett...

Nonlinear hunting speeds of railway vehicles running on a tangent track are analytically obtained using Hopf bifurcation theory in this paper. The railway vehicle model consists of nonlinear primary yaw dampers, nonlinear flange contact stiffness as well as the clearance between the wheel flange and rail tread. Linear and nonlinear critical speeds are obtained using Bogoliubov method. A compreh...

The concept of self-replicating machines was introduced more than fifty years ago by John von Neumann. However, to our knowledge a fully autonomous selfreplicating robot has not been implemented until now. Here we describe a fully autonomous prototype that demonstrates robotic self replication. This work builds on our previous results in remote-controlled robotic replication and semi-autonomous...

Proso millet (Panicum miliaceum L.) is well-adapted for the Central Great Plains and could be planted in a winter wheat (Triticum aestivum L.)-millet-fallow rotation, resulting in two crops in 3 yr. To determine the most suitable tillage system for proso millet production within this rotation, seven tillage management systems were evaluated over a 6-yr period (1972-1977). The research was condu...

Reading Roma Correu is a surprise and gift, it allows us to resume the thread of an interrupted correspondence, reconciles instigates recover reinvent our role as actors on that great theater landscape. The vision four authors intertwines here, giving scene we have not been able tread. As generous letter, recomposes dialogue warmly inviting re-encounter with city, which fills void current abili...

This paper presents a method for animating and rendering an interactive natural scenery in real-time. It improves the prairie model of [11] by enabling the on-the-fly generation of blades of grass, at three different levels of detail, from user-specified density maps. A new animation function, the tread on grass, is defined to allow virtual objects or characters to crush the grass. The resultin...

Falls near the bottom of a flight of stairs have resulted from an illusion that the person was stepping off onto the bottom landing when the person was still two treads or more above the landing. The illusion is caused by poor lighting and design defects built into the stairway. The poor lighting may be attributed to a building code that allows inadequate lighting near the bottom of external st...