39 research outputs found
Coulomb plasmas in outer envelopes of neutron stars
Outer envelopes of neutron stars consist mostly of fully ionized, strongly
coupled Coulomb plasmas characterized by typical densities about 10^4-10^{11}
g/cc and temperatures about 10^4-10^9 K. Many neutron stars possess magnetic
fields about 10^{11}-10^{14} G. Here we briefly review recent theoretical
advances which allow one to calculate thermodynamic functions and electron
transport coefficients for such plasmas with an accuracy required for
theoretical interpretation of observations.Comment: 4 pages, 2 figures, latex2e using cpp2e.cls (included). Proc. PNP-10
Workshop, Greifswald, Germany, 4-9 Sept. 2000. Accepted for publication in
Contrib. Plasma Phys. 41 (2001) no. 2-
Catalytic cracking of naphtha: The effect of Fe and Cr impregnated ZSM-5 on olefin selectivity
This study focuses on the modification of ZSM-5 in order to enhance the catalytic cracking of refinery naphtha to produce
light olefins. ZSM-5 was metal modified using different loadings (0.5–5 wt%) of Fe and Cr via the impregnation method.
The metal modified ZSM-5 samples are compared and the effect of metal loading on the physicochemical properties and
catalytic performance is investigated. Fe and Cr modification had an effect on both the physicochemical properties of the
catalysts as well as catalytic activity and selectivity. Metal loading caused a decrease in the specific surface area which
decreased further with increased metal loading. Fe had a greater effect on the total acidity in particular strong acid sites when
compared to Cr. The optimum Fe loading was established which promoted selectivity to olefins, in particular propylene. Fe
also had a dominant effect on the P/E ratio of which a remarkable ratio of five was achieved as well as enhanced the stability
of the catalyst. Cr was found to be a good promoter for selectivity to BTX products with a two-fold increase observed when
compared to Fe-modified catalysts
Calculation of the current density distribution in a plasma lens to produce ring-like ion beam profiles
Entwicklung eines Methodenkatalogs für manöverbasiertes Fahren nach dem Conduct-by-Wire-Prinzip - Ein Fahrerassistenzkonzept auf Bahnführungsebene
Development and Validation of Manoeuvre-Based Driver Assistance Functions for Conduct-by-Wire with IPG CarMaker
Systematic Development of Manoeuvre-Based Driver Assistance Functions for Conduct-by-Wire with IPG CarMaker
Verification of a maneuver catalog for a maneuver-based vehicle guidance system
A quickly increasing number of advanced driver assistance systems are implemented in modern vehicles. Already today, this can lead to a mental overload of drivers, since every single system has its own control elements. In the future, innovative vehicle interaction concepts, with a global design philosophy, will be necessary. Conduct-by-Wire (CbW) is an approach to relieve drivers from stabilization tasks, as the vehicle will be controlled by assigning concrete elements, the maneuvers, which are executed automatically. This could possibly lead to a more cognitive way of driving, keeping the driver closer in the loop. The basic requirement for this concept is the development of a maneuver catalog from the driver’s point of view, in order to enable easy, even intuitive driving. Therefore, this paper describes how a driver would divide a specific track into single maneuvers, based upon an already existing catalog of commands. An innovative experimental concept is developed, consisting of a field and laboratory study, using the ‘thinking aloud’ method, an eye tracking and a decision point analysis