Now showing items 61-70 of 116
Photoluminescence linewidth of self-organized In0.4Ga0.6As/GaAsIn0.4Ga0.6As/GaAs quantum dots grown on InGaAlAs stressor dots
(The American Institute of Physics, 1999-10-15)
The molecular beam epitaxial growth of self-organized In0.4Ga0.6As/GaAsIn0.4Ga0.6As/GaAs quantum dots on buried InGaAsAs/GaAs stressor dots has been characterized by photoluminescence measurements and cross-sectional ...
Nucleation of chemical vapor deposited silicon nitride on silicon dioxide
(The American Institute of Physics, 1999-03-29)
We have studied the early stages of silicon nitride chemical vapor deposition (CVD) on silicon dioxide using medium energy ion scattering. The growth mode consists of island nucleation followed by coalescence. Similar ...
High performance organic polymer light-emitting heterostructure devices
(The American Institute of Physics, 1999-04-19)
We report a high performance electroluminescence device based on bi-layer conjugated polymer structures consisting of a hole transporting (amine-fluorene) and an emissive (benzothiadiazole-fluorene) polymer layers prepared ...
Electronic structure and magnetic properties of high-spin octahedral Co(II) complexes: Co(II)(acac)2(H2O)2Co(II)(acac)2(H2O)2
(The American Institute of Physics, 1999-12-08)
An analysis of the electronic structure of the high-spin 3d73d7 Co(II) ion in the approximately octahedral Co(II)(acac)2(H2O)2Co(II)(acac)2(H2O)2 complex is presented in terms of crystal fields of descending symmetry from ...
Scale symmetries of spherical string fluids
(The American Institute of Physics, 1999-08)
We consider homothetic maps in a family of spherical relativistic star models. A generalization of Vaidya’s radiating metric provides a fluid atmosphere of radiation and strings. The similarity structure of the string fluid ...
Structural and luminescence characteristics of cycled submonolayer InAs/GaAs quantum dots with room-temperature emission at 1.3 μm
(The American Institute of Physics, 1999-12-01)
Quantum dots were grown by molecular beam epitaxy on GaAs substrates using a cycled submonolayer InAs/GaAs deposition technique. Their structural and luminescence characteristics have been compared with conventional ...
Scaling supernova hydrodynamics to the laboratory
(The American Institute of Physics, 1999-05)
Supernova (SN) 1987A focused attention on the critical role of hydrodynamic instabilities in the evolution of supernovae. To test the modeling of these instabilities, we are developing laboratory experiments of hydrodynamic ...
Radial temperature profiles of X-ray-emitting gas within clusters of galaxies
(Univ Chicago Press, 1999-07-10)
Previous analyses of ASCA data of clusters of galaxies have found conflicting results regarding the slope of the temperature profile of the hot X-ray gas within clusters, mainly because of the large, energy-dependent ...
Formation of oriented particles in an amorphous host: ZnS nanocrystals in silicon
(The American Institute of Physics, 1999-02-01)
Processes for incorporating randomly oriented crystalline precipitates in an amorphous host can be traced back to the 17th century when Cassius produced “gold ruby” glass. In this glass, octahedral colloidal precipitates ...
Ordered subsets algorithms for transmission tomography
(IOP Publishing Ltd, 1999-11-01)
The ordered subsets EM (OSEM) algorithm has enjoyed considerable interest for emission image reconstruction due to its acceleration of the original EM algorithm and ease of programming. The transmission EM reconstruction ...