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  • 1
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    Static deformation due to shear and tensile faults in a layered half-space (2003)
    In:  Bulletin of the Seismological Society of America, Oxford and Edinburgh, Blackwell Scientific Publications, vol. 93, no. 5, pp. 2253-2263, pp. B09408, (ISBN: 0534351875, 2nd edition)
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    Publication Date: 2003
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Modelling ; Layers ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Experimental study of the process zone, nucleation zone and plastic area of earthquakes by the shadow optical method of caustics (2002)
    In:  Pure and Applied Geophysics, Reykjavík, Icelandic Meteorological Office, Ministry for the Environment, University of Iceland, vol. 159, no. 9, pp. 1951-1966, pp. B05316, (ISSN: 1340-4202)
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    Publication Date: 2002
    Keywords: Fracture ; Source ; Rheology ; Seismology ; Elasticity ; Waves ; Data analysis / ~ processing ; Modelling ; PAG
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Task switching and response correspondence in the psychological refractory period paradigm (2003)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Three experiments examined the effects of task switching and response correspondence in a psychological refractory period paradigm. A letter task (vowel-consonant) and a digit task (odd-even) were combined to form 4 possible dual-task pairs in each trial: letter-letter, letter-digit, digit-digit, and digit-letter. Foreknowledge of task transition (repeat or switch) and task identity (letter or digit) was varied across experiments: no foreknowledge in Experiment 1, partial foreknowledge (task transition only) in Experiment 2, and full foreknowledge in Experiment 3. For all experiments, the switch cost for Task 2 was additive with stimulus onset asynchrony, and the response-correspondence effect for Task 2 was numerically smaller in the switch condition than in the repeat condition. These outcomes suggest that reconfiguration for Task 2 takes place after the central processing of Task 1 and that the crosstalk correspondence effect is due to response activation by way of stimulus-response associations.
    Keywords: Behavioral Sciences
    Type: Journal of experimental psychology. Human perception and performance (ISSN 0096-1523); Volume 29; 3; 692-712
    Format: text
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  • 4
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    Task switching in a hierarchical task structure: evidence for the fragility of the task repetition benefit (2004)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: This study examined how task switching is affected by hierarchical task organization. Traditional task-switching studies, which use a constant temporal and spatial distance between each task element (defined as a stimulus requiring a response), promote a flat task structure. Using this approach, Experiment 1 revealed a large switch cost of 238 ms. In Experiments 2-5, adjacent task elements were grouped temporally and/or spatially (forming an ensemble) to create a hierarchical task organization. Results indicate that the effect of switching at the ensemble level dominated the effect of switching at the element level. Experiments 6 and 7, using an ensemble of 3 task elements, revealed that the element-level switch cost was virtually absent between ensembles but was large within an ensemble. The authors conclude that the element-level task repetition benefit is fragile and can be eliminated in a hierarchical task organization.
    Keywords: Life Sciences (General)
    Type: Journal of experimental psychology. Learning, memory, and cognition (ISSN 0278-7393); Volume 30; 3; 697-713
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  • 5
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    Stimulus-response compatibility and psychological refractory period effects: implications for response selection (2002)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The purpose of this paper was to provide insight into the nature of response selection by reviewing the literature on stimulus-response compatibility (SRC) effects and the psychological refractory period (PRP) effect individually and jointly. The empirical findings and theoretical explanations of SRC effects that have been studied within a single-task context suggest that there are two response-selection routes-automatic activation and intentional translation. In contrast, all major PRP models reviewed in this paper have treated response selection as a single processing stage. In particular, the response-selection bottleneck (RSB) model assumes that the processing of Task 1 and Task 2 comprises two separate streams and that the PRP effect is due to a bottleneck located at response selection. Yet, considerable evidence from studies of SRC in the PRP paradigm shows that the processing of the two tasks is more interactive than is suggested by the RSB model and by most other models of the PRP effect. The major implication drawn from the studies of SRC effects in the PRP context is that response activation is a distinct process from final response selection. Response activation is based on both long-term and short-term task-defined S-R associations and occurs automatically and in parallel for the two tasks. The final response selection is an intentional act required even for highly compatible and practiced tasks and is restricted to processing one task at a time. Investigations of SRC effects and response-selection variables in dual-task contexts should be conducted more systematically because they provide significant insight into the nature of response-selection mechanisms.
    Keywords: Life Sciences (General)
    Type: Psychonomic bulletin & review (ISSN 1069-9384); Volume 9; 2; 212-38
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  • 6
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    Ideomotor compatibility in the psychological refractory period effect: 29 years of oversimplification (2002)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Four experiments examined whether the psychological refractory period (PRP) effect can be eliminated with ideomotor compatible (IM) but not stimulus-response compatible (SR) tasks, as reported by A. G. Greenwald and H. G. Shulman (1973). Their tasks were used: a left or right movement to a left- or right-pointing arrow (IM) or to the word left or right (SR) for Task 1; saying "A" or "B" (IM) or "1" or "2" (SR) to an auditory A or B for Task 2. The stimulus onset asynchronies were 0, 100, 200, 300, 500, and 1,000 ms in Experiment 1, and only 0, 100, 200, and 1,000 ms in Experiments 2-4. The arrow was in the center of the screen in Experiments 1-3 and to the left or right in Experiment 4. As in Greenwald and Shulman's Experiment 2, the instructions stated that most often the 2 stimuli would be presented simultaneously. A PRP effect was obtained in all conditions, most likely because response-selection decisions are required even for IM tasks.
    Keywords: Life Sciences (General)
    Type: Journal of experimental psychology. Human perception and performance (ISSN 0096-1523); Volume 28; 2; 396-409
    Format: text
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  • 7
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    Agent Architecture for Aviation Data Integration System (2004)
    In:  CASI
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    Publication Date: 2013-08-29
    Description: This paper describes the proposed agent-based architecture of the Aviation Data Integration System (ADIS). ADIS is a software system that provides integrated heterogeneous data to support aviation problem-solving activities. Examples of aviation problem-solving activities include engineering troubleshooting, incident and accident investigation, routine flight operations monitoring, safety assessment, maintenance procedure debugging, and training assessment. A wide variety of information is typically referenced when engaging in these activities. Some of this information includes flight recorder data, Automatic Terminal Information Service (ATIS) reports, Jeppesen charts, weather data, air traffic control information, safety reports, and runway visual range data. Such wide-ranging information cannot be found in any single unified information source. Therefore, this information must be actively collected, assembled, and presented in a manner that supports the users problem-solving activities. This information integration task is non-trivial and presents a variety of technical challenges. ADIS has been developed to do this task and it permits integration of weather, RVR, radar data, and Jeppesen charts with flight data. ADIS has been implemented and used by several airlines FOQA teams. The initial feedback from airlines is that such a system is very useful in FOQA analysis. Based on the feedback from the initial deployment, we are developing a new version of the system that would make further progress in achieving following goals of our project.
    Keywords: Computer Programming and Software
    Format: application/pdf
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  • 8
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    Panel Flutter and Sonic Fatigue Analysis for RLV (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: A methodology is presented for the flutter analysis of the seal of thermal protection system (TPS) panel of X-33 Advanced Technology Demonstrator test vehicle. The seal is simulated as a two-dimensional cantilevered panel with an elastic stopper, which is modeled as an equivalent spring. This cantilever beam-spring model under the aerodynamic pressure at supersonic speeds turns out to be an impact nonlinear dynamic system. The flutter analysis of the seal is thus carried out using, time domain numerical simulation with a displacement stability criterion. The flutter boundary of the seal is further verified with a family of three traditional and one nontraditional panel flutter models. The frequency domain method that applies eigenanalysis on the traditional panel flutter problem was used. The results showed that the critical dynamic pressure could be more than doubled with properly chosen material for the base stopper. The proposed methodology can be easily extended to three-dimensional panel seals with flow angularity.
    Keywords: Metals and Metallic Materials
    Format: application/pdf
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  • 9
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    Stormtime Particle Energization with High Temporal Resolution AMIE Potentials (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Simulations were conducted to investigate the influence of rapid electric field fluctuations on electron energization in the inner magnetosphere based on the assimilative mapping of ionospheric electrodynamics (AMIE) technique. Simulations for four different magnetic storms were run, namely those that occurred on 15 May 1997, 4 May 1998, 25 September 1998, and 19 October 1998. Here we have examined the formation of high- energy (100-500 keV) electrons in the inner magnetosphere during these storm events with our recently developed relativistic radiation belt transport code. The point of this numerical experiment is to show that a simulation of a real event must have the high time resolution electric field input files in order to produce the seed population for the radiation belts, which are often observed to increase in the days following a magnetic storm. Specifically, a cadence of the global electric field pattern of 5 min or less produces inner magnetospheric fluxes that are larger (by up to several orders of magnitude) than fluxes produced with a longer cadence. Differences were particularly large relative to simulation results with a 3-hour time cadence, analogous to a Kpdriven electric field model.
    Keywords: Plasma Physics
    Type: Journal of Geophysical Research (ISSN 0148-0227); 109; 1-17
    Format: text
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  • 10
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    Solar-Powered Airplane with Cameras and WLAN (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: An experimental airborne remote sensing system includes a remotely controlled, lightweight, solar-powered airplane (see figure) that carries two digital-output electronic cameras and communicates with a nearby ground control and monitoring station via a wireless local-area network (WLAN). The speed of the airplane -- typically 〈50 km/h -- is low enough to enable loitering over farm fields, disaster scenes, or other areas of interest to collect high-resolution digital imagery that could be delivered to end users (e.g., farm managers or disaster-relief coordinators) in nearly real time.
    Keywords: Aeronautics (General)
    Type: ARC-15061 , NASA Tech Briefs, December 2004; 19-20
    Format: application/pdf
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