Showing papers by "National Institute of Advanced Industrial Science and Technology published in 1984"
Journal Article•
73 citations
TL;DR: In this paper, a first demonstration of one-dimensional Monte Carlo simulations of AlGaAs/GaAs heterojunction bipolar transistors was reported, where the electron motion was solved by a particle model, while the hole motion is solved by conventional hydrodynamic model.
Abstract: A first demonstration of one-dimensional Monte Carlo simulations of AlGaAs/GaAs heterojunction bipolar transistors is reported. The electron motion is solved by a particle model, while the hole motion is solved by a conventional hydrodynamic model. It is shown that the compositional grading of Al x Ga 1-x As in the base region is effective to cause the ballistic acceleration of electrons in the base region, resulting in a high collector current density of above 1 mA/µm2. The current-gain cutoff frequency fT reaches 150 GHz if the size of a transistor is properly designed. Also shown is the relation between the device performances and the electron dynamics investigated.
64 citations
TL;DR: Using pulse surface reaction rate analysis coupled with an emissionless diffuse reflectance infrared spectrometer, it has been found that addition of V, Mo, W, or Re greatly increases the rate of C-O bond dissociation of adsorbed CO in methanation on Ru/Al2O3 as discussed by the authors.
Abstract: Using pulse surface reaction rate analysis coupled with an emissionless diffuse reflectance infrared spectrometer, it has been found that addition of V, Mo, W, or Re greatly increases the rate of C–O bond dissociation of adsorbed CO in methanation on Ru/Al2O3.
8 citations
01 Jul 1984
TL;DR: In this article, an experience de reconnaissance de mots connexe utilisant la programmation dynamique continu (CDP) and analyse du resultat experimental is described.
Abstract: Description d'une experience de reconnaissance de mots connexe utilisant la programmation dynamique continu (CDP) et analyse du resultat experimental. Proposition d'une procedure pour determiner des mots utilisant des treillis de mots a partir des valeurs CDP et amelioration des experiences de reconnaissance
8 citations
TL;DR: In this article, the activation energies of helium dissociation from helium-vacancy clusters in vanadium, niobium and molybdenum have been performed by a computer simulation method.
Abstract: Atomistic calculations of activation energies of helium dissociation from helium-vacancy clusters in vanadium, niobium and molybdenum have been performed by a computer simulation method. In the process, formation energies of vacancy clusters, interstitial helium and helium-vacancy clusters have been also calculated as well as migration energies of vacancy and helium. Potentials of metal-metal and helium-metal for vanadium and molybdenum were after Johnson and Wilson, whereas other potentials were constructed in a similar manner. Calculated dissociation energies in vanadium and niobium are around 3.0 eV and smaller than those in molybdenum (4.0 eV to 5.0 eV). Large helium dissociation energies from small clusters suggest stable agglomeration states of helium in these bcc metals.
6 citations