Research of Magnetospheric Physics Phenomena Using Sounding Rockets

A bibliography of approximately 25 papers is presented on the Electron Echo Experiments. The data analysis included an extensive study of the electron accelerator beam, detector data correlations with the electron beam injections, and the study of about 30 onboard detected echoes

Collisions and Spirals of Loewner Traces

We analyze Loewner traces driven by functions asymptotic to K\sqrt{1-t}. We prove a stability result when K is not 4 and show that K=4 can lead to non locally connected hulls. As a consequence, we obtain a driving term \lambda(t) so that the hulls driven by K\lambda(t) are generated by a continuous curve for all K > 0 with K not equal to 4 but not when K = 4, so that the space of driving terms with continuous traces is not convex. As a byproduct, we obtain an explicit construction of the traces driven by K\sqrt{1-t} and a conceptual proof of the corresponding results of Kager, Nienhuis and Kadanoff, math-ph/0309006Comment: 34 pages, 11 figure

The Returns to Computer Use Revisited: Have Pencils Changed the Wage Structure Too?

Are the large measured wage differentials associated with on-the-job computer use productivity gains or the result of unobserved heterogeneity? We examine this issue with three large cross-sectional surveys from Germany. First, we confirm that the estimated wage differentials associated with computer use in Germany are very similar to the U.S. differential. Second, using the same techniques we also measure large differentials for on-the-job use of calculators, telephones, pens or pencils, or for those who work while sitting down. Along with our reanalysis of the U.S. data these findings cast some doubt on the interpretation of the computer-use wage differential as reflecting productivity effects arising from the introduction of computers in the workplace.