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  • 1
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    Deaggregation in magnitude, distance and azimuth in the south and west of the Iberian Peninsula (2002)
    In:  Bulletin of the Seismological Society of America, Basle, Wiley, vol. 92, no. 6, pp. 2177-2185, pp. L14610, (ISSN: 1340-4202)
    Details
    Publication Date: 2002
    Keywords: Seismicity ; Magnitude ; Earthquake hazard ; Attenuation ; Radiation pattern ; Pelaez ; Lopez ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Detectors for the James Webb Space Telescope Near-Infrared Spectrograph (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: The Near-Infrared Spectrograph (NIRSpec) is the James Webb Space Telescope's primary near-infrared spectrograph. NASA is providing the NIRSpec detector subsystem, which consists of the focal plane array, focal plane electronics, cable harnesses, and software. The focal plane array comprises two closely-butted lambda (sub co) approximately 5 micrometer Rockwell HAWAII- 2RG sensor chip assemblies. After briefly describing the NIRSpec instrument, we summarize some of the driving requirements for the detector subsystem, discuss the baseline architecture (and alternatives), and presents some recent detector test results including a description of a newly identified noise component that we have found in some archival JWST test data. We dub this new noise component, which appears to be similar to classical two-state popcorn noise in many aspects, "popcorn mesa noise." We close with the current status of the detector subsystem development effort.
    Keywords: Instrumentation and Photography
    Type: SPIE Conference; Unknown
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    NASA TECHNICAL REPORTS
  • 3
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    Image Analysis via Fuzzy-Reasoning Approach: Prototype Applications at NASA (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A set of imaging techniques based on Fuzzy Reasoning (FR) approach was built for NASA at Kennedy Space Center (KSC) to perform complex real-time visual-related safety prototype tasks, such as detection and tracking of moving Foreign Objects Debris (FOD) during the NASA Space Shuttle liftoff and visual anomaly detection on slidewires used in the emergency egress system for Space Shuttle at the launch pad. The system has also proved its prospective in enhancing X-ray images used to screen hard-covered items leading to a better visualization. The system capability was used as well during the imaging analysis of the Space Shuttle Columbia accident. These FR-based imaging techniques include novel proprietary adaptive image segmentation, image edge extraction, and image enhancement. Probabilistic Neural Network (PNN) scheme available from NeuroShell(TM) Classifier and optimized via Genetic Algorithm (GA) was also used along with this set of novel imaging techniques to add powerful learning and image classification capabilities. Prototype applications built using these techniques have received NASA Space Awards, including a Board Action Award, and are currently being filed for patents by NASA; they are being offered for commercialization through the Research Triangle Institute (RTI), an internationally recognized corporation in scientific research and technology development. Companies from different fields, including security, medical, text digitalization, and aerospace, are currently in the process of licensing these technologies from NASA.
    Keywords: Space Transportation and Safety
    Type: KSC-2004--004 , IEEE International Conference on Fuzzy Systems; Jul 25, 2004 - Jul 29, 2004; Budapest; Hungary
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    NASA TECHNICAL REPORTS
  • 4
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    New Gas Polarographic Hydrogen Sensor (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Polarography is the measurement of the current that flows in solution as a function of an applied voltage. The actual form of the observed polarographic current depends upon the manner in which the voltage is applied and on the characteristics of the working electrode. The new gas polarographic H2 sensor shows a current level increment with concentration of the gaseous H2 similar to those relating to metal ions in liquid electrolytes in well-known polarography. This phenomenon is caused by the fact that the diffusion of the gaseous H2 through a gas diffusion hole built in the sensor is a rate-determining step in the gaseous-hydrogen sensing mechanism. The diffusion hole artificially limits the diffusion of the gaseous H2 toward the electrode located at the sensor cavity. This gas polarographic H2 sensor. is actually an electrochemical-pumping cell since the gaseous H2 is in fact pumped via the electrochemical driving force generated between the electrodes. Gaseous H2 enters the diffusion hole and reaches the first electrode (anode) located in the sensor cavity to be transformed into an H+ ions or protons; H+ ions pass through the electrolyte and reach the second electrode (cathode) to be reformed to gaseous H2. Gas polarographic 02 sensors are commercially available; a gas polarographic 02 sensor was used to prove the feasibility of building a new gas polarographic H2 sensor.
    Keywords: Electronics and Electrical Engineering
    Type: KSC-2004-002 , ISA/IEEE SIcon Conference; Jan 27, 2004 - Jan 29, 2004; New Orleans, LA; United States
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    NASA TECHNICAL REPORTS
  • 5
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    Image Analysis via Soft Computing: Prototype Applications at NASA KSC and Product Commercialization (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: No abstract available
    Keywords: Instrumentation and Photography
    Type: KSC-2004-067
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    NASA TECHNICAL REPORTS
  • 6
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    Detecting Edges in Images by Use of Fuzzy Reasoning (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A method of processing digital image data to detect edges includes the use of fuzzy reasoning. The method is completely adaptive and does not require any advance knowledge of an image. During initial processing of image data at a low level of abstraction, the nature of the data is indeterminate. Fuzzy reasoning is used in the present method because it affords an ability to construct useful abstractions from approximate, incomplete, and otherwise imperfect sets of data. Humans are able to make some sense of even unfamiliar objects that have imperfect high-level representations. It appears that to perceive unfamiliar objects or to perceive familiar objects in imperfect images, humans apply heuristic algorithms to understand the images
    Keywords: Man/System Technology and Life Support
    Type: KSC-12278 , NASA Tech Briefs, November 2003; 7-8
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    NASA TECHNICAL REPORTS
  • 7
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    Independent Testing of JWST Detector Prototypes (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The Independent Detector Testing Laboratory (IDTL) is jointly operated by the Space Telescope Science Institute (STScI) and the Johns Hopkins University (JHU), and is assisting the James Webb Space Telescope (JWST) mission in choosing and operating the best near-infrared detectors. The JWST is the centerpiece of the NASA Office of Space Science theme, the Astronomical Search for Origins, and the highest priority astronomy project for the next decade, according to the National Academy of Science. JWST will need to have the sensitivity to see the first light in the Universe to determine how galaxies formed in the web of dark matter that existed when the Universe was in its infancy (z is approximately 10-20). To achieve this goal, the JWST Project must pursue an aggressive technology program and advance infrared detectors to performance levels beyond what is now possible. As part of this program, NASA has selected the IDTL to verify comparative performance between prototype JWST detectors developed by Rockwell Scientific (HgCdTe) and Raytheon (InSb). The IDTL is charged with obtaining an independent assessment of the ability of these two competing technologies to achieve the demanding specifications of the JWST program within the 0.6-5 micron bandpass and in an ultra-low background (less than 0.01 e(-)/s/pixel) environment. We describe results from the JWST Detector Characterization Project that is being performed in the LDTL. In this project, we are measuring first-order detector parameters, i.e. dark current, read noise, QE, intra-pixel sensitivity, linearity, as functions of temperature, well size, and operational mode.
    Keywords: Astronomy
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    NASA TECHNICAL REPORTS
  • 8
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    An Expert Assistant for Computer Aided Parallelization (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The prototype implementation of an expert system was developed to assist the user in the computer aided parallelization process. The system interfaces to tools for automatic parallelization and performance analysis. By fusing static program structure information and dynamic performance analysis data the expert system can help the user to filter, correlate, and interpret the data gathered by the existing tools. Sections of the code that show poor performance and require further attention are rapidly identified and suggestions for improvements are presented to the user. In this paper we describe the components of the expert system and discuss its interface to the existing tools. We present a case study to demonstrate the successful use in full scale scientific applications.
    Keywords: Computer Systems
    Type: PARA''04 Workshop on State-of-the-Art in Scientific Computing; Jun 20, 2004 - Jun 24, 2004; Kopenhagen; Denmark
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    NASA TECHNICAL REPORTS
  • 9
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    The Propulsive Small Expendable Deployer System (ProSEDS) (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This Final Report covers the following main topics: 1) Brief Description of ProSEDS; 2) Mission Analysis; 3) Dynamics Reference Mission; 4) Dynamics Stability; 5) Deployment Control; 6) Updated System Performance; 7) Updated Mission Analysis; 8) Updated Dynamics Reference Mission; 9) Updated Deployment Control Profiles and Simulations; 10) Updated Reference Mission; 11) Evaluation of Power Delivered by the Tether; 12) Deployment Control Profile Ref. #78 and Simulations; 13) Kalman Filters for Mission Estimation; 14) Analysis/Estimation of Deployment Flight Data; 15) Comparison of ED Tethers and Electrical Thrusters; 16) Dynamics Analysis for Mission Starting at a Lower Altitude; 17) Deployment Performance at a Lower Altitude; 18) Satellite Orbit after a Tether Cut; 19) Deployment with Shorter Dyneema Tether Length; 20) Interactive Software for ED Tethers.
    Keywords: Spacecraft Design, Testing and Performance
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    NASA TECHNICAL REPORTS
  • 10
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    What Multilevel Parallel Programs do when you are not Watching: A Performance Analysis Case Study Comparing MPI/OpenMP, MLP, and Nested OpenMP (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: With the current trend in parallel computer architectures towards clusters of shared memory symmetric multi-processors, parallel programming techniques have evolved that support parallelism beyond a single level. When comparing the performance of applications based on different programming paradigms, it is important to differentiate between the influence of the programming model itself and other factors, such as implementation specific behavior of the operating system (OS) or architectural issues. Rewriting-a large scientific application in order to employ a new programming paradigms is usually a time consuming and error prone task. Before embarking on such an endeavor it is important to determine that there is really a gain that would not be possible with the current implementation. A detailed performance analysis is crucial to clarify these issues. The multilevel programming paradigms considered in this study are hybrid MPI/OpenMP, MLP, and nested OpenMP. The hybrid MPI/OpenMP approach is based on using MPI [7] for the coarse grained parallelization and OpenMP [9] for fine grained loop level parallelism. The MPI programming paradigm assumes a private address space for each process. Data is transferred by explicitly exchanging messages via calls to the MPI library. This model was originally designed for distributed memory architectures but is also suitable for shared memory systems. The second paradigm under consideration is MLP which was developed by Taft. The approach is similar to MPi/OpenMP, using a mix of coarse grain process level parallelization and loop level OpenMP parallelization. As it is the case with MPI, a private address space is assumed for each process. The MLP approach was developed for ccNUMA architectures and explicitly takes advantage of the availability of shared memory. A shared memory arena which is accessible by all processes is required. Communication is done by reading from and writing to the shared memory.
    Keywords: Computer Programming and Software
    Type: Workshop on OpenMP Applications and Tools; May 17, 2004 - May 18, 2004; Houston, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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