Time resolved photoluminescence experiments show the importance of photon recycling in p‐(Ga,Al)As:Si liquid‐phase epitaxial layers with a graded band gap. In particular, it is confirmed that the drift of the electrons in the built‐in electric field may be neglected. St...

The flow of air through compact bundles of parallel textile fibers has been studied in order to obtain values of the shape factor k0 for the channels through which the flow takes place. When the fibers are cylinders and the flow is parallel to their axes, k0 is an incre...

Spin polarization of photoelectrons and Auger electrons plays an important role in the study of electronic states in magnetic materials. After reviewing the effects of electron correlation on the photoemission spectra in Ni, we present our theory of spin‐polarized photo...

Orthorhombic single crystals of TbMn0.5Fe0.5O3 are found to exhibit spin-reorientation, magnetization reversal and weak ferromagnetism. Strong anisotropy effects are evident in the temperature dependent magnetization measurements along the three crystallographic axes a,...

Degraded magnetic tapes and data were recovered from damaged reels through a series of chemical, mechanical, and rerecording processes. This paper describes the procedures used on three reels recovered from the space shuttle Challenger after being immersed in the ocean ...

The present study concerns two-dimensional nonlinear mechanisms of bidirectional and unidirectional channeling of longitudinal and shear waves emerging in the locally resonant acoustic structure. The system under consideration comprises an oscillatory chain of the axial...

Two‐dimensional governing equations of successively higher‐order approximations for guided electromagnetic (EM) waves in an isotropic dielectric plate surrounded by free space are deduced from the three‐dimensional Maxwell’s equations by expanding the EM vector potentia...

The optical response of regularly arranged noble metal wires with nanoscopic cross sections (nanowire gratings) strongly depends on the polarization direction of the incident light. We use silver and gold nanowire gratings produced by electron beam lithography to study ...

Schottky barrier rectifying contacts using e‐beam‐deposited platinum have been demonstrated on n‐type β‐SiC. The electrical properties of these contacts were examined as a function of annealing temperature using I‐V and C‐V measurements. Auger analysis was used to study...

Using a previously reported low‐energy sputtering technique, Nb‐Ge films have been prepared with superconducting Tc's up to ∼23 K. High‐field, x‐ray, and annealing results are reported for these highest‐Tc films. A discussion of the critical parameters required to achie...