Recursos de colección

NASA Technical Reports Server (NTRS) (686.496 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 161 - 180 de 321.855

  1. Spaceport Command and Control System Automated Testing

    Stein, Meriel
    The Spaceport Command and Control System (SCCS) is the National Aeronautics and Space Administrations (NASA) launch control system for the Orion capsule and Space Launch System, the next generation manned rocket currently in development. This large system requires high quality testing that will properly measure the capabilities of the system. Automating the test procedures would save the project time and money. Therefore, the Electrical Engineering Division at Kennedy Space Center (KSC) has recruited interns for the past two years to work alongside full-time engineers to develop these automated tests, as well as innovate upon the current automation process.

  2. Investigating the Seasonal and Diurnal Cycles of Ocean Vector Winds, Precipitation, and Lightning Near the Philippines

    Rutledge, Steve; Lang, Timothy; Xu, Weixin
    No abstract available

  3. Observed Structure and Characteristics of Cold Pools over Tropical Oceans using Scatterometer Vector Wind Retrievals

    Thayer, Jeffrey D.; Lang, Timothy J.; Nesbitt, Stephen W.; Garg, Piyush; Chronis, Themis; Hence, Deanna A.
    No abstract available

  4. Lessons Learned from Successful Earth Science Research-to-Applications Efforts

    Spann, James
    No abstract available

  5. The Scintillation Prediction Observations Research Task (SPORT) Mission

    Krause, Linda; Casas, Joseph; Le, Guan; Heelis, Rod; Abdu, Mangalathayil; Bishop, Rebecca; Fry, G.; Spann, James; Durao, Otavio; Denardin, Clezio; Nash-Stevenson, Shelia; Loures, Luis; Swenson, Charles
    SPORT is a science mission using a 6U CubeSat and integrated ground network that will (1) advance understanding and (2) enable improved predictions of scintillation occurrence that impact GPS signals and radio communications. This is the science of Space Weather. SPORT is an international partnership with NASA, U.S. institutions, the Brazilian National Institute for Space Research (INPE), and the Technical Aeronautics Institute under the Brazilian Air Force Command Department (DCTA/ITA).

  6. General Nobile and the Airship Italia: No Second-In-Command

    Bendrick, Gregg A.
    The airship Italia, commanded by General Umberto Nobile, crashed during its return flight from the North Pole in 1928. Prior work has demonstrated the possibility that this crash was fatigue-related, due to significant sleep-deprivation on the part of its Commander, and to resulting errors in cognition and judgment. However, the underlying cause of the fatigue was likely due to the fact that the Commander did not have a Second-In-Command on board to take over duties while the Commander was allowed to rest. At that time the Second-In-Command was a formally designated position, and according to Nobiles previous writings was considered...

  7. Su Lyncis, a Hard X-Ray Bright M Giant: Clues Point to a Large Hidden Population of Symbiotic Stars

    Lucy, A. B.; Cusumano, G.; Segreto, A.; Luna, G. J. M.; Nunez, N. E.; Sokoloski, J. L.; Munari, U.; Mukai, K.; Nelson, T.
    Symbiotic star surveys have traditionally relied almost exclusively on low resolution optical spectroscopy. However, we can obtain a more reliable estimate of their total Galactic population by using all available signatures of the symbiotic phenomenon. Here we report the discovery of a hard X-ray source, 4PBC J0642.9+5528, in the Swift hard X-ray all-sky survey, and identify it with a poorly studied red giant, SU Lyn, using pointed Swift observations and ground-based optical spectroscopy. The X-ray spectrum, the optical to UV spectrum, and the rapid UV variability of SU Lyn are all consistent with our interpretation that it is a symbiotic...

  8. Spaceport Command and Control System Software Development

    Glasser, Abraham
    The Spaceport Command and Control System (SCCS) is the National Aeronautics and Space Administration's (NASA) launch control system for the Orion capsule and Space Launch System, the next generation manned rocket currently in development. This large system requires a large amount of intensive testing that will properly measure the capabilities of the system. Automating the test procedures would save the project money from human labor costs, as well as making the testing process more efficient. Therefore, the Exploration Systems Division (formerly the Electrical Engineering Division) at Kennedy Space Center (KSC) has recruited interns for the past two years to work...

  9. Spaceport Command and Control System Software Development

    Kessluk, Jonathan
    During the course of this internship, software was developed to ensure the efficient management and allocation of an employee to an area of their expertise or experience that may otherwise have gone unnoticed. This directly affects any future missions prescribed to the SLS by allowing management to easily see where employees can be re-allocated to different mission specific projects or assist a project that may be lacking in a specific field. This software is intended to provide proof of NASA's diligence and deliberation in hiring new employees and in providing training and guidance to employees who may have fallen short...

  10. Spaceport Command and Control System Automated Verification Software Development

    Backus, Michael W.
    For as long as we have walked the Earth, humans have always been explorers. We have visited our nearest celestial body and sent Voyager 1 beyond our solar system1 out into interstellar space. Now it is finally time for us to step beyond our home and onto another planet. The Spaceport Command and Control System (SCCS) is being developed along with the Space Launch System (SLS) to take us on a journey further than ever attempted. Within SCCS are separate subsystems and system level software, each of which have to be tested and verified. Testing is a long and tedious...

  11. Demonstration of Numerical Equivalence of Ensemble and Spectral Averaging in Electromagnetic Scattering by Random Particulate Media

    Dlugach, Janna M.; Zakharova, Nadezhda T.; Mishchenko, Michael I.
    The numerically exact superposition T-matrix method is used to model far-field electromagnetic scattering by two types of particulate object. Object 1 is a fixed configuration which consists of N identical spherical particles (with N 200 or 400) quasi-randomly populating a spherical volume V having a median size parameter of 50. Object 2 is a true discrete random medium (DRM) comprising the same number N of particles randomly moving throughout V. The median particle size parameter is fixed at 4. We show that if Object 1 is illuminated by a quasi-monochromatic parallel beam then it generates a typical speckle pattern having...

  12. Microbial Monitoring from the Frontlines to Space: A Successful Validation of a Department of Defense (DoD) Funded Small Business Innovation Research (SBIR) Technology on Board the International Space Station (ISS)

    Roman, Monsi; Pollack, Lawrence; Ott, Mark; Oubre, Cherie; Khodadad, Christina; Castro, Victoria
    The RAZOR EX (Registered Trademark) PCR unit was initially developed by the DoD as part of an SBIR project to detect and identify biothreats during field deployment. The system was evaluated by NASA as a commercial technology for future microbial monitoring requirements and has been successfully demonstrated in microgravity on-board the International Space Station.

  13. TEM Analysis of Diffusion-Bonded Silicon Carbide Ceramics Joined Using Metallic Interlayers

    Tsuda, H.; Mori, S.; Hasegawa, Y; Halbig, M. C.; Ozaki, T.; Singh, M.; Asthana, R.
    Silicon Carbide (SiC) is a promising material for thermostructural applications due to its excellent high-temperature mechanical properties, oxidation resistance, and thermal stability. However, joining and integration technologies are indispensable for this material in order to fabricate large size and complex shape components with desired functionalities. Although diffusion bonding techniques using metallic interlayers have been commonly utilized to bond various SiC ceramics, detailed microstructural observation by Transmission Electron Microscopy (TEM) of the bonded area has not been carried out due to difficulty in preparing TEM samples. In this study, we tried to prepare TEM samples from joints of diffusion bonded SiC...

  14. Sensitivity of the Asteroid Redirect Robotic Mission (ARRM) to Launch Date and Asteroid Stay Time

    Burke, Laura M.; Vavrina, Matthew A.; Mcguire, Melissa L.; Strange, Nathan J.; Qu, Min; McCarty, Steven L.; Shen, Haijun
    National Aeronautics and Space Administrations (NASAs) proposed Asteroid Redirect Mission (ARM) is being designed to robotically capture and then redirect an asteroidal boulder into a stable orbit in the vicinity of the moon, where astronauts would be able to visit and study it. The current reference trajectory for the robotic portion, ARRM, assumes a launch on a Delta-IV H in the end of the calendar year 2021, with a return for astronaut operations in cislunar space in 2026. The current baseline design allocates 245 days of stay time at the asteroid for operations and boulder collection. This paper outlines analysis...

  15. Creep, Fatigue and Environmental Interactions and Their Effect on Crack Growth in Superalloys

    Ghosn, L. J.; Telesman, J.; Smith, T.; Gabb, T. P.
    Complex interactions of creep/fatigue/environment control dwell fatigue crack growth (DFCG) in superalloys. Crack tip stress relaxation during dwells significantly changes the crack driving force and influence DFCG. Linear Elastic Fracture Mechanics, Kmax, parameter unsuitable for correlating DFCG behavior due to extensive visco-plastic deformation. Magnitude of remaining crack tip axial stresses controls DFCG resistance due to the brittle-intergranular nature of the crack growth process. Proposed a new empirical parameter, Ksrf, which incorporates visco-plastic evolution of the magnitude of remaining crack tip stresses. Previous work performed at 704C, extend the work to 760C.

  16. Holographic Rovers: Augmented Reality and the Microsoft HoloLens

    Toler, Laura
    Augmented Reality is an emerging field in technology, and encompasses Head Mounted Displays, smartphone apps, and even projected images. HMDs include the Meta 2, Magic Leap, Avegant Light Field, and the Microsoft HoloLens, which is evaluated specifically. The Microsoft HoloLens is designed to be used as an AR personal computer, and is being optimized with that goal in mind. Microsoft allied with the Unity3D game engine to create an SDK for interested application developers that can be used in the Unity environment.

  17. Electronics and Software Engineer for Robotics Project Intern

    Teijeiro, Antonio
    I was assigned to mentor high school students for the 2017 First Robotics Competition. Using a team based approach, I worked with the students to program the robot and applied my electrical background to build the robot from start to finish. I worked with students who had an interest in electrical engineering to teach them about voltage, current, pulse width modulation, solenoids, electromagnets, relays, DC motors, DC motor controllers, crimping and soldering electrical components, Java programming, and robotic simulation. For the simulation, we worked together to generate graphics files, write simulator description format code, operate Linux, and operate SOLIDWORKS. Upon...

  18. Launch Control Network Engineer

    Medeiros, Samantha
    The Spaceport Command and Control System (SCCS) is being built at the Kennedy Space Center in order to successfully launch NASAs revolutionary vehicle that allows humans to explore further into space than ever before. During my internship, I worked with the Network, Firewall, and Hardware teams that are all contributing to the huge SCCS network project effort. I learned the SCCS network design and the several concepts that are running in the background. I also updated and designed documentation for physical networks that are part of SCCS. This includes being able to assist and build physical installations as well as...

  19. Oceanic convective systems: ASCAT and NEXRAD retrieval analysis

    Priftis, Georgios; Lang, Timothy J.; Chronis, Themis
    No abstract available

  20. Eclipse 2017: Partnering with NASA MSFC to Inspire Students

    Fry, Craig "Ghee"; Krause, Linda; Gallagher, Dennis; Adams, Mitzi
    NASA's Marshall Space Flight Center (MSFC) is partnering with the U.S. Space and Rocket Center (USSRC), and Austin Peay State University (APSU) to engage citizen scientists, engineers, and students in science investigations during the 2017 American Solar Eclipse. Investigations will support the Citizen Continental America Telescopic Eclipse (CATE), Ham Radio Science Citizen Investigation(HamSCI), and Interactive NASA Space Physics Ionosphere Radio Experiments (INSPIRE). All planned activities will engage Space Campers and local high school students in the application of the scientific method as they seek to explore a wide range of observations during the eclipse. Where planned experiments touch on current...

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