In view of the recent work which has been done by Davisson and Ger-mer,l G. P. Thomson,2 and others in investigating the angular scattering of electrons by crystals, and the work of E. G. Dymond3 in extending these investigations to the scattering of electrons by helium, it was.thought worthwhile to see if similar results could be obtained for this-scattering by other monatomic and diatomic gas...

double layer zno/sno2 thin film resistive gas sensors were fabricated by successive pvd of those oxides onto porcelain substrates. the metallic contacts were provided by electron beam evaporation of platinum onto substrates prior to deposition of the gas sensitive layers. deposits were thermally annealed at different temperatures. it was shown that the activation energy of electrical conduction...

ni-p and ni layers multilayer coatings were applied to az31 magnesium alloy utilizing electroless and electrodeposition procedures. the aim of the project was to decrease cracks and increase corrosion resistance of the coatings. in order to compare the coatings, the effect of single layer electroless ni-p coatings with different thicknesses was also investigated. the microstructure and phase co...

Gas stopping is becoming the method of choice for converting beams of rare isotopes obtained via projectile fragmentation and in-flight separation into low-energy beams. These beams allow ISOL-type experiments , such as mass measurements with traps or laser spectroscopy, to be performed with projectile fragmentation products. Current gas stopper systems for high-energy beams are based on linear...

In this article, we report the studies of various device architectures of organic lightemitting devices (OLEDs) incorporating highly efficient blue-emitting and ambipolar carriertransport ter(9,9-diarylfluorene)s, and their influences on device characteristics. The device structures investigated include single-layer devices and multilayer heterostructure devices employing the terfluorene as one...

Understanding exciton behavior in organic semiconductor molecules is crucial for the development of organic semiconductor-based excitonic devices such as organic light-emitting diodes and organic solar cells, and the tightly bound electron-hole pair forming an exciton is normally assumed to be localized on an organic semiconducting molecule. We report the observation of long-range coupling of e...

To meet the growing demand for a high-power Heterostructure Field-Effect Transistor (HFET) family based on InP, we have developed and characterized a circuitcapable InA1As/n+-InP HFET technology employing InP not merely as a substrate but also epitaxially as the channel and as an etch-stopper in a selectively-recessed gate scheme. This thesis presents an experimental assessment of the benefits ...