Analytical techniques of pilot scanning behavior and their application

The state of the art of oculometric data analysis techniques and their applications in certain research areas such as pilot workload, information transfer provided by various display formats, crew role in automated systems, and pilot training are documented. These analytical techniques produce the following data: real-time viewing of the pilot's scanning behavior, average dwell times, dwell percentages, instrument transition paths, dwell histograms, and entropy rate measures. These types of data are discussed, and overviews of the experimental setup, data analysis techniques, and software are presented. A glossary of terms frequently used in pilot scanning behavior and a bibliography of reports on related research sponsored by NASA Langley Research Center are also presented

Dissolution Kinetics of Stilbite at Various Temperatures under Alkaline Conditions

Experiments measuring the dissolution rates of stilbite (NaCa [Al Si O ].14H O) in pH-buffered solutions were 2 5 13 36 2 performed in batch reactors at 4, 25, 40 and 60 oC. The pH conditions of the buffer solutions ranged from 8.5 to 12.5. The dissolution rates calculated from silicon concentration of the reacting fluid increased with increasing temperature (4–60 oC) and pH. The dissolution rates ranged from 3.45 x 10-15 (mol cm-2 s-1) at pH 10.7 and 4oC to 1.93 x 10-9 (mol cm-2 s-1) at pH 12 and 60oC and were pH dependent. The rate law was established as R = k (a -)n , where k is OH the rate constant, a is the activity of the OH- species and n the reaction order. The n values obtained were, 0.32 at 4 oC, 0.35 at 25 oC, 0.38 at 40 oC and 0.38 at 60 oC. Activation energy determined using Arrhenius plot was 48.45 kJ/mol at pH 9 and 30.88 kJ/mol at pH 12

Hyper-resistivity to global-superconductivity transition by annealing in quench-condensed Pb films

The rapid rise in resistance occurring in barely conducting quench-condensed Pb films cooled through temperatures characteristic of the bulk superconducting transition is found to be strongly current dependent, the resistance increasing rapidly with decreasing current and temperature. Annealing the same film at temperatures below 40 K changes the behavior to that of a conventional superconductor with resistance that drops as the film current and temperature decrease. Experimental evidence suggests this results from a transition from quasiparticle-dominated to Josephson-dominated tunneling