This paper demonstrates several group features observed from small seismic waveforms and distinguishes abnormal group features that preceded destructive major shocks from normal ones. Important group features discussed in this paper include direction of seismic wave’s first motion, amplitude ratio, half period of the first motion, frequency components of earthquakes, and linearity of seismic wa...

The analysis of conversational dynamics in small groups, like the one illustrated in Figure 1.1, is a fundamental area in social psychology and nonverbal communication [Goodwin, 1981, Clark and Carlson, 1982]. Conversational patterns exist at multiple time scales, ranging from knowing how and when to address or interrupt somebody, how to gain or hold the floor of a conversation, and how to make...

Proving a conjecture of Dennis Johnson, we show that the Torelli subgroup Ig of the genus g mapping class group has a finite generating set whose size grows cubically with respect to g. Our main tool is a new space called the handle graph on which Ig acts cocompactly.

We propose and analyze an improved small-x equation which incorporates exact leading and next-to-leading BFKL kernels on one hand and renormalization group constraints in the relevant collinear limits on the other. We work out in detail the recently proposed ω-expansion of the solution, derive the Green’s function factorization properties and discuss both the gluon anomalous dimension and the h...

Interactions between galaxies have spectacular effects on gas dynamics, and small galaxy groups are a privileged place to investigate them. In particular, they could test the existence of cold H 2 gas as dark matter in the outer parts of galaxies. HI observations have revealed that galaxies in small groups are deficient in atomic gas, like in richer galaxy clusters such as Virgo, although in a ...