We have studied the temperature dependent phonon emission rate P(T) of a strongly interacting (r(s) > or =22) dilute 2D GaAs hole system using a standard carrier heating technique. In the still poorly understood metallic state, we observe that P(T) changes from P(T) approximately T5 to P(T) approximately T7 above 100 mK, indicating a crossover from screened piezoelectric (PZ) coupling to screen...

We obtain the asymptotic density of open p-brane states with zero-modes included. The resulting logarithmic correction to the p-brane entropy has a coefficient − 2p , and is independent of the dimension of the embedding spacetime. Such logarithmic corrections to the entropy, with precisely this coefficient, appear in two other contexts also: a gas of massless particles in p-dimensional space, a...

We obtain the asymptotic density of p-brane states with zeromodes included. The resulting logarithmic correction to the pbrane entropy has a coefficient − 2p , and is independent of the dimension of the embedding spacetime. Such logarithmic corrections to the entropy, with precisely this coefficient, appear in two other contexts also: a gas of massless particles in p-dimensional space, and a Sc...

Cutting efficiency and quality are very sensitive to gas jet pressure and nozzle standoff distance. Do a high gas pressure and a small standoff distance necessarily give better material removal capability and cutting quality? Simple experiments to measure the mass flow rate were carried out for two types of geometry: a circular hole and a linear cut directly underneath an axisymmetric nozzle. T...

The energy spectrum of a two-dimensional electron gas (2DEG) interacting with a valence-band hole is studied in the high magnetic field limit as a function of the filling factor ν and the separation d between the electron and hole layers. For d smaller than the magnetic length λ, the hole binds one or more electrons to form neutral (X) or charged (X−) excitons. The low-lying states can be under...