We propose and experimentally test a method to fabricate patterns of steep, sharp features on surfaces, by exploiting the nonlinear dynamics of uniformly ion-bombarded surfaces. We show via theory, simulation, and experiment that the steepest parts of the surface evolve as one-dimensional curves that move in the normal direction at constant velocity. The curves are a special solution to the non...

Spectral methods using spherical harmonic basis functions have proven to be very eeective in geophysical and astrophysical simulations. It is an unfortunate fact, however , that spurious oscillations, known as the Gibbs phenomenon, contaminate these spectral solutions, particularly in regions where discontinuities or steep gradients occur. They are also apparent in the polar regions even when c...

The effect of nutrients of natural source, such as corn steep liquor, peptone, and yeast extract, on the fermentative production of L-glutamic acid from hydrocarbons by a Corynebacterium was studied. Corn steep liquor and meat extract were found to be remarkably stimulatory to L-glutamic acid production; about 5 g per liter of L-glutamic acid were accumulated in a culture broth containing 3% n-...

To explore the mechanisms for steep pulse irreversible electroporation technology to kill the lung cancer cell L9981. The apoptosis, cells mitochondrial membrane potential, internal PH changes and the intra-cellular calcium ions concentration were detected after steep pulses acted on the human large cell lung cancer cell L9981. Apoptosis test results indicated that cancer cells mainly experienc...