Recursos de colección

NASA Technical Reports Server (NTRS) (681.912 recursos)

The NTRS is a valuable resource for students, educators, researchers, and the public for access to NASA's current and historical technical literature since it was first released in 1994. NTRS provides access to approximately 500K aerospace related citations, 90K full-text online documents, and 111K images and videos. NTRS numbers continues to grow over time as new scientific and technical information (STI) is created or funded by NASA. The type of information found in NTRS include: conference papers, images, journal articles, photos, meeting papers, movies, patents, research reports, and technical videos.

Mostrando recursos 1 - 20 de 317.432

  1. A Reliability Model for Ni-BaTiO3-Based (BME) Ceramic Capacitors

    Liu, Donhang
    The evaluation of multilayer ceramic capacitors (MLCCs) with base-metal electrodes (BMEs) for potential NASA space project applications requires an in-depth understanding of their reliability. The reliability of an MLCC is defined as the ability of the dielectric material to retain its insulating properties under stated environmental and operational conditions for a specified period of time t. In this presentation, a general mathematic expression of a reliability model for a BME MLCC is developed and discussed. The reliability model consists of three parts: (1) a statistical distribution that describes the individual variation of properties in a test group of samples (Weibull,...

  2. Arduino-Raspberry Pi: Hobbyist Hardware and Radiation Total Dose Degradation

    Violette, Daniel P.
    This presentation covers top-level total ionizing dose (TID) testing and evaluation of commercial CubeSat hardware modules from Arduino and RaspberryPi.

  3. Relative Radiation Risk Reduction for Small Spacecraft and New Designers

    Campola, Michael J.
    Presentation for the NASA Electronic Parts and Packaging (NEPP) Small Mission Workshop.

  4. Compendium of Single Event Effects, Total Ionizing Dose, and Displacement Damage for Candidate Spacecraft Electronics for NASA

    Buchner, Stephen P.; OBryan, Martha V.; Cochran, Donna J.; Campola, Michael J.; Pellish, Jonathan A.; Boutte, Alvin J.; Lauenstein, Jean-Marie; Wilcox, Edward P.; Gigliuto, Robert A.; Violette, Daniel P.; LaBel, Kenneth A.; Berg, Melanie D.; Casey, Megan C.; Topper, Alyson D.; Ladbury, Raymond L.; Chen, Dakai
    We present results and analysis investigating the effects of radiation on a variety of candidate spacecraft electronics to proton and heavy ion induced single event effects (SEE), proton-induced displacement damage (DD), and total ionizing dose (TID). Introduction: This paper is a summary of test results.NASA spacecraft are subjected to a harsh space environment that includes exposure to various types of ionizing radiation. The performance of electronic devices in a space radiation environment is often limited by its susceptibility to single event effects (SEE), total ionizing dose (TID), and displacement damage (DD). Ground-based testing is used to evaluate candidate spacecraft electronics...

  5. Compendium of Single Event Effects, Total Ionizing Dose, and Displacement Damage for Candidate Spacecraft Electronics for NASA

    Buchner, Stephen P.; Violette, Daniel P.; Pellish, Jonathan A.; Chen, Dakai; Berg, Melanie D.; Gigliuto, Robert A.; Casey, Megan C.; Lauenstein, Jean-Marie; O'Bryan, Martha V.; Ladbury, Raymond L.; Boutte, Alvin J.; Topper, Alyson D.; Cochran, Donna J.; Campola, Michael J.; LaBel, Kenneth A.; Wilcox, Edward P.
    We present results and analysis investigating the effects of radiation on a variety of candidate spacecraft electronics to proton and heavy ion-induced single-event effects (SEE), proton-induced displacement damage (DD), and total ionizing dose (TID). This paper is a summary of test results.

  6. Design for Review - Applying Lessons Learned to Improve the FPGA Review Process

    Li, Kenneth E.; Figueiredo, Marco A.
    Flight Field Programmable Gate Array (FPGA) designs are required to be independently reviewed. This paper provides recommendations to Flight FPGA designers to properly prepare their designs for review in order to facilitate the review process, and reduce the impact of the review time in the overall project schedule.

  7. How the Sun Knocks Out My Cell Phone from 150 Million Kilometers Away

    Ladbury, Ray
    Large solar particle events (SPE) threaten many elements of critical infrastructure. A 2013 study by Lloyds of London and Atmospheric and Environmental Research recently found that if a worst-case solar event like the 1859 Carrington Event struck our planet now, it could result on $0.6-$2.36 trillion in damages to the economy. In March 2014, researchers Y. D. Liu et al. revealed that just such an event had narrowly missed Earth in July 2012. The event was observed by the STEREO A spacecraft. In this presentation, we examine how the sun can pack such a punch from 150 million km away,...

  8. NASA Electronic Parts and Packaging (NEPP) Program Preliminary Update for FY15

    Sampson, Michael J.; LaBel, Kenneth A.
    No abstract available

  9. Why Space is Unique? The Basic Environment Challenges for EEE Parts

    Sampson, Michael J.; LaBel, Kenneth A.
    This presentation includes an introduction the space radiation environment, the effects on electronics, the environment in action, flight projects, mission needs, and radiation hardness assurance (RHA).

  10. Evaluation of Polymer Hermetically Sealed Tantalum Capacitors

    Teverovsky, Alexander A.
    Polymer cathode tantalum capacitors have lower ESR (equivalent series resistance) compared to other types of tantalum capacitors and for this reason have gained popularity in the electronics design community. Their use allows improved performance of power supply systems along with substantial reduction of size and weight of the components used. However, these parts have poor thermal stability and can degrade in humid environments. Polymer hermetically sealed (PHS) capacitors avoid problems related to environmental degradation of molded case parts and can potentially replace current wet and solid hermetically sealed capacitors. In this work, PHS capacitors manufactured per DLA LAM DWG#13030 are...

  11. Evaluation of Ferrite Chip Beads as Surge Current Limiters in Circuits with Tantalum Capacitors

    Teverovsky, Alexander
    Limiting resistors are currently required to be connected in series with tantalum capacitors to reduce the risk of surge current failures. However, application of limiting resistors decreases substantially the efficiency of the power supply systems. An ideal surge current limiting device should have a negligible resistance for DC currents and high resistance at frequencies corresponding to transients in tantalum capacitors. This work evaluates the possibility of using chip ferrite beads (FB) as such devices. Twelve types of small size FBs from three manufacturers were used to evaluate their robustness under soldering stresses and at high surge current spikes associated with...

  12. Evaluation of Case Size 0603 BME Ceramic Capacitors

    Teverovsky, Alexander A.
    High volumetric efficiency of commercial base metal electrode (BME) ceramic capacitors allows for a substantial reduction of weight and sizes of the parts compared to currently used military grade precious metal electrode (PME) capacitors. Insertion of BME capacitors in space applications requires a thorough analysis of their performance and reliability. In this work, six types of cases size 0603 BME capacitors from three vendors have been evaluated. Three types of multilayer ceramic capacitors (MLCCs) were designed for automotive industry and three types for general purposes. Leakage currents in the capacitors have been measured in a wide range of voltages and...

  13. The Starfish Exo-Atmospheric, High Altitude Nuclear Weapons Test

    Stassinopoulos, Epaminondas
    This presentation is an overview of previously published (open literature) high-altitude nuclear weapons tests and their effects on space weather.

  14. Random Vibration Testing of Advanced Wet Tantalum Capacitors

    Teverovsky, Alexander
    No abstract available

  15. Random Vibration Testing of Advanced Wet Tantalum Capacitors

    Teverovsky, Alexander
    Advanced wet tantalum capacitors allow for improved performance of power supply systems along with substantial reduction of size and weight of the systems that is especially beneficial for space electronics. Due to launch-related stresses, acceptance testing of all space systems includes random vibration test (RVT). However, many types of advanced wet tantalum capacitors cannot pass consistently RVT at conditions specified in MIL-PRF-39006, which impedes their use in space projects. This requires a closer look at the existing requirements, modes and mechanisms of failures, specifics of test conditions, and acceptance criteria. In this work, different lots of advanced wet tantalum capacitors...

  16. How to Characterize the Reliability of Ceramic Capacitors with Base-Metal Electrodes (BMEs)

    Liu, Donhang
    The reliability of an MLCC device is the product of a time-dependent part and a time-independent part: 1) Time-dependent part is a statistical distribution; 2) Time-independent part is the reliability at t0, the initial reliability. Initial reliability depends only on how a BME MLCC is designed and processed. Similar to the way the minimum dielectric thickness ensured the long-term reliability of a PME MLCC, the initial reliability also ensures the long term-reliability of a BME MLCC. This presentation shows new discoveries regarding commonalities and differences between PME and BME capacitor technologies.

  17. 2015 NEPP Tasks Update for Ceramic and Tantalum Capacitors

    Teverovsky, Alexander
    This presentation provides a NASA Electronic Parts and Packaging (NEPP) program update on tantalum and ceramic capacitors.

  18. Science, Technology, Engineering, Mathematics Poster

    Kozusko, Timothy J.
    This is a simple poster for Community Day at the Visitor Center. It describes, as an overview, an example of the use of GPS and LiDAR data to determine the loss of scrubjay habitat due to a change in water table.

  19. Kennedy Space Center Five Year Sustainability Plan

    Williams, Ann T.
    The Federal Government is committed to following sustainable principles. At its heart, sustainability integrates environmental, societal and economic solutions for present needs without compromising the ability of future generations to meet their needs. Building upon its pledge towards environmental stewardship, the Administration generated a vision of sustainability spanning ten goals mandated within Executive Order (EO) 13693, Planning for Federal Sustainability in the Next Decade. In November 2015, the National Aeronautics and Space Administration (NASA) responded to this EO by incorporating it into a new release of the NASA Strategic Sustainability Performance Plan (SSPP). The SSPP recognizes the importance of aligning...

  20. Distributed Visualization Project

    Craig, Douglas; Kickbusch, Tracey; Conroy, Michael; Mazone, Rebecca
    Distributed Visualization allows anyone, anywhere to see any simulation at any time. Development focuses on algorithms, software, data formats, data systems and processes to enable sharing simulation-based information across temporal and spatial boundaries without requiring stakeholders to possess highly-specialized and very expensive display systems. It also introduces abstraction between the native and shared data, which allows teams to share results without giving away proprietary or sensitive data. The initial implementation of this capability is the Distributed Observer Network (DON) version 3.1. DON 3.1 is available for public release in the NASA Software Store ( and works with version 3.0 of...

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