Detached Eddy Simulation (DES) of flap side-edge flow was performed with a wing and half-span flap configuration used in previous experimental and numerical studies. The focus of the study is the unsteady flow features responsible for the production of far-field noise. The simulation was performed at a Reynolds number (based on the main wing chord) of 3.7 million. Reynolds Averaged Navier-Stokes (RANS) simulations were performed as a precursor to the DES. The results of these precursor...
Topics: Balakrishnan, Shankar K., NASA Ames Research Center, Oak Ridge Associated Universities, Shariff,...
No abstract available
Topics: Morin, Cory, NASA Marshall Space Flight Center, Oak Ridge Associated Universities, Quattrochi, Dale...
The Strata-1 experiment studies the evolution of small body regolith through long-duration exposure of simulant materials to the microgravity environment on the International Space Station (ISS). This study will record segregation and mechanical dynamics of regolith simulants in a microgravity and vibration environment similar to that experienced by regolith on small Solar System bodies. Strata-1 will help us understand regolith dynamics and will inform design and procedures for landing and...
Topics: Fries, Marc, Graham, Lee, John, Kristen, NASA Johnson Space Center, Oak Ridge Associated...
Carbonates can potentially provide sites for organic materials to accrue and develop into complex macromolecules. This study examines the organics associated with carbonates in carbonaceous chondrites using micron-Raman imaging.
Topics: Chan, Q. H. S., NASA Johnson Space Center, Oak Ridge Associated Universities, Inc., Zolensky, M. E.
A computational fluid dynamics code based on the flux reconstruction (FR) method is currently being developed at NASA Glenn Research Center to ultimately provide a large- eddy simulation capability that is both accurate and efficient for complex aeropropulsion flows. The FR approach offers a simple and efficient method that is easy to implement and accurate to an arbitrary order on common grid cell geometries. The governing compressible Navier-Stokes equations are discretized in time using...
Topics: DeBonis, James R., Huynh, H. T., NASA Glenn Research Center, Oak Ridge Associated Universities,...
The application of tracer methods have, especially in medicine, opened a new class of physical problems, which have seemingly been given little consideration. Probably this is because the theoretical physicists today are so much occupied by quantum mechanics and theory of relativity that there is hardly any interest left over for what belongs to old fashioned statistical mechanics. Therefore, in the interpretation of tracer data, people have been forced to rely mainly on inductive methods,...
Topics: DTIC Archive, Bergner, Per-Erik E, OAK RIDGE ASSOCIATED UNIVERSITIES TN, *STATISTICAL MECHANICS,...
The growth in computational power and algorithm development in the past few decades has granted the science and engineering community the ability to simulate flows over complex geometries, thus making Computational Fluid Dynamics (CFD) tools indispensable in analysis and design. Currently, one of the pacing items limiting the utility of CFD for general problems is the prediction of unsteady turbulent ows.1{3 Reynolds-averaged Navier-Stokes (RANS) methods, which predict a time-invariant mean...
Topics: Ceze, Marco A., Diosady, Laslo T., Murman, Scott M., NASA Ames Research Center, Oak Ridge...
This report summarizes research progress to date in topology optimization (TO) for additive manufacturing (AM) and fatigue. The effort has been divided into 2 parts: TO for AM and TO for fatigue of metals. The 2-D and 3-D solutions are presented for TO for AM and fatigue. The proposed design approaches have produced promising results and suggest further investigation. A path forward is suggested in the conclusion.
Topics: DTIC Archive, Johnson,Terrence E, Oak Ridge Associated Universities (ORAU) Belcamp United States,...
This document serves as the quick-start guide for GIFT Cloud, the web-based application version of the Generalized Intelligent Framework for Tutoring (GIFT). GIFT is a modular, open-source framework for building, deploying, and managing adaptive training content. GIFT Cloud allows learners, authors, and researchers to access GIFT without downloading and installing software on a desktop or laptop computer. The purpose of this document is to provide an overview of the primary interfaces and basic...
Topics: DTIC Archive, Ososky, Scott, Oak Ridge Associated Universities Oak Ridge United States,...
This document serves as the quick-start guide for GIFT Cloud, the web-based application version of the Generalized Intelligent Framework for Tutoring (GIFT). GIFT is a modular, open-source framework for building, deploying, and managing adaptive training content. GIFT Cloud allows learners, authors, and researchers to access GIFT without downloading and installing software on a desktop or laptop computer. The purpose of this document is to provide an overview of the primary interfaces and basic...
Topics: DTIC Archive, Ososky, Scott, Oak Ridge Associated Universities Oak Ridge United States, USER...
The perfectly matched layer (PML) technique is developed in the context of a high- order spectral-element Discontinuous-Galerkin (DG) method. The technique is applied to a range of test cases and is shown to be superior compared to other approaches, such as those based on using characteristic boundary conditions and sponge layers, for treating the inflow and outflow boundaries of computational domains. In general, the PML technique improves the quality of the numerical results for simulations...
Topics: Diosady, Laslo T., Garai, Anirban, Madavan, Nateri K., Murman, Scott M., NASA Ames Research Center,...
The Interface Region Imaging Spectrograph (IRIS), launched in the summer of 2013, is designed specifically to observe and investigate the transition region and adjacent layers of the solar atmosphere, obtaining images in high spatial, temporal, and spectral resolution. Our particular work is focused on the evolution of inter-moss loops, which have been detected in the lower corona by the Atmospheric Imaging Assembly (AIA) and the High-Resolution Coronal Imager (Hi- C), but are known to have...
Topics: Alabama Univ., Alexander, Caroline, De Pontieu, Bart, Fayock, Brian, Lockheed Martin Solar and...
Mercury cadmium selenide (Hg1-xCdxSe) is a possible alternative material to mercury cadmium telluride (Hg1 xCdxTe) for infrared (IR) sensor applications, but etch pit density (EPD) measurements are required to measure dislocations that affect device performance. No EPD solutions have been reported for Hg1 xCdxSe, and standard EPD solutions for Hg1 xCdxTe have proved ineffective. Thus, a new etching solution is required for EPD measurements of Hg1 xCdxSe. Samples were etched in various solutions...
Topics: DTIC Archive, OAK RIDGE ASSOCIATED UNIVERSITIES TN, *CADMIUM SELENIDES, *CADMIUM TELLURIDES,...
Calcium, Aluminum-rich inclusions (CAIs) are the first forming solids of the Solar system. Their observed abundance, mean size, and mineralogy vary quite significantly between different groups of chondrites. These differences may reflect the dynamics and distinct cosmochemical conditions present in the region(s) of the protoplanetary disk from which each type likely accreted. Only about 11 such objects have been found in L and LL type while another 57 have been found in H type ordinary...
Topics: Jacobs Technology, Inc., Lunar and Planetary Inst., Marhas, K. K., Mishra, R. K., NASA Johnson...
Introduction: Results from MESSENGER spacecraft have confirmed the reduced nature of Mercury, based on its high core/mantle ratio and its FeO-poor and S-rich surface. Moreover, high resolution images revealed large volcanic plains and abundant pyroclastic deposits, suggesting major melting stages of the Mercurian mantle. In addition, MESSENGER has provided the most precise data to date on major elemental compositions of Mercury's surface. These results revealed considerable chemical...
Topics: 5fd5717861dc45b48d50a26366090383, Boujibar, A., Danielson, L. R., Fontaine, E., Jacobs Technology,...
Earth's core contains approximately 10 percent light elements that are likely a combination of S, C, Si, and O, with Si possibly being the most abundant. Si dissolved into Fe liquids can have a large effect on the magnitude of the activity coefficient of siderophile elements (SE) in Fe liquids, and thus the partitioning behavior of those elements between core and mantle. The effect of Si can be small such as for Ni and Co, or large such as for Mo, Ge, Sb, As. The effect of Si on many...
Topics: Boujibar, A., Danielson, L. R., Florida State Univ., Houston Univ., Humayun, M., Jacobs Technology,...
Based on the findings of the Army Strategic Plan for Civilian Personnel Management Research: A Roadmap for the Future, a questionnaire containing 16 broad areas for possible research was designed. The purpose of this effort was to assign priorities to research topics aimed at improving the management of the Army's civilian personnel. This questionnaire was distributed to key individuals throughout the Army. These persons were drawn from all major commands and represented military and civilian...
Topics: DTIC Archive, Clark, Sheldon B, OAK RIDGE ASSOCIATED UNIVERSITIES TN, *PERSONNEL MANAGEMENT,...
Observations made by the VIIRS day/night band (DNB) provide daily, nighttime measurements to monitor Earth surface processes.However, these observations are impacted by variations in reflected solar radiation on the moon's surface. As the moon transitions from new to full phase, increasing radiance is reflected to the Earth's surface and contributes additional reflected moonlight from clouds and land surface, in addition to emissions from other light sources observed by the DNB. The...
Topics: Alabama Univ., Cole, Tony A., Connecticut Univ., Molthan, Andrew L., NASA Goddard Space Flight...
Polycyclic aromatic hydrocarbon (PAH) molecules are considered the best carriers to account for the ubiquitous infrared emission bands. PAHs have also been proposed as candidates to explain the diffuse interstellar bands (DIBs), a series of absorption features seen on the interstellar extinction curve and are plausible carriers for the extended red emission (ERE), a photoluminescent process associated with a wide variety of interstellar environments. Extensive efforts have been devoted over the...
Topics: Bay Area Environmental Research Inst., Bejaoui, Salma, Contreras, Cesar, European Space Agency....
The objective of this effort was to provide decision makers and researchers with an information-based tool for assessing the general nature and magnitude of research efforts necessary for making long-term improvements in the management of Army civilian personnel. It is part of a follow-up activity to an earlier study that identified potential topics for research in this area. This report's companion document, Establishing Priorities for Civilian Personnel Management Research in the Army,...
Topics: DTIC Archive, Clark, Sheldon B, OAK RIDGE ASSOCIATED UNIVERSITIES TN, *RESEARCH MANAGEMENT,...
Simulated space radiation at doses similar to those of solar particle events or a round-trip sojourn to Mars (1-2Gy) may cause skeletal tissue degradation and deplete stem/progenitor cell pools throughout the body. We hypothesized that simulated space radiation (SSR) causes late, time-dependent deficits in bone structure and bone cell function reflected by changes in gene expression in response to anabolic stimuli. We used a unique sequential dual ion exposure (proton and iron) for SSR to...
Topics: Alwood, Joshua S., Blue Marble Space, California Univ., Castillo, Alesha B., Globus, R. K., NASA...
In Titan's atmosphere, composed mainly of N2 (95-98%) and CH4 (2-5%), a complex chemistry occurs at low temperature, and leads to the production of heavy organic molecules and subsequently solid aerosols. Here, we used the Titan Haze Simulation (THS) experiment, an experimental setup developed at the NASA Ames COSmIC simulation facility to study Titan's atmospheric chemistry at low temperature. In the THS, the chemistry is simulated by plasma in the stream of a supersonic expansion. With this...
Topics: Bay Area Environmental Research Inst., Beauchamp, Jack L., Bejaoui, Salma, California Inst. of...
Trajectory calculations with convective influence diagnosed from geostationary-satellite cloud measurements are used to evaluate the relative importance of different Tropical Tropopause Layer (TTL) transport pathways for establishing the distribution of carbon monoxide (CO) at 100 hPa as observed by the Microwave Limb Sounder (MLS) on board the Aura satellite. Carbon monoxide is a useful tracer for investigating TTL transport and convective influence because the CO lifetime is comparable to the...
Topics: NASA Technical Reports Server (NTRS), 0639e0f74bd049e2a03a4ba681e9622d,...
The evolution of rapidly intensifying Hurricane Karl (2010) is examined from a suite of remote sensing observations during the NASA Genesis and Rapid Intensification Processes (GRIP) field experiment. The novelties of this study are in the analysis of data from the airborne Doppler radar HIWRAP and the new Global Hawk airborne platform that allows long endurance sampling of hurricanes. Supporting data from the HAMSR microwave sounder coincident with HIWRAP and coordinated flights with the NOAA...
Topics: NASA Technical Reports Server (NTRS), 179138db7f984ba5a8988e2b48979a23,...
Our central hypothesis is that oxidative stress plays a key role in cell dysfunction and progressive bone loss caused by radiation exposure during spaceflight. In animal studies, excess free radical formation is associated with pathological changes in bone structure, enhanced bone resorption, reduced bone formation and decreased bone mineral density, which can lead to skeletal fragility. We previously reported that exposure to low or high-LET radiation rapidly increases expression levels of...
Topics: NASA Technical Reports Server (NTRS), 91c09d903cd44d17a0555f412db42519,...
The numerical simulation of many aerodynamic non-periodic flows of practical interest involves discretized computational domains that often must be artificially truncated. Appropriate boundary conditions are required at these truncated domain boundaries, and ideally, these boundary conditions should be perfectly \"absorbing\" or \"nonreflecting\" so that they do not contaminate the flow field in the interior of the domain. The proper specification of these boundaries is...
Topics: 4540cd94d24c4bf29f8773a27faf96b2, Garai, Anirban, Madavan, Nateri K., Murman, Scott M., NASA Ames...
The incidence of wildfires in the Arctic and subarctic is increasing; in boreal North America, for example, the burned area is expected to increase by 200-300 over the next 50-100 years, which previous studies suggest could have a large effect on cloud microphysics, lifetime, albedo, and precipitation. However, the interactions between smoke particles and clouds remain poorly quantified due to confounding meteorological influences and remote sensing limitations. Here, we use data from several...
Topics: Colorado Univ., Cubison, M. C., Diskin, G. S., Georgia Inst. of Tech., Illinois Univ., Jimenez, J....
Topics: Radio Program, Oak Ridge Associated Universities, Emotion, Streets and roads
Southern Africa produces almost a third of the Earth's biomass burning (BB) aerosol particles. Particles lofted into the mid-troposphere are transported westward over the South-East (SE) Atlantic, home to one of the three permanent subtropical stratocumulus (Sc) cloud decks in the world. The SE Atlantic stratocumulus deck interacts with the dense layers of BB aerosols that initially overlay the cloud deck, but later subside and may mix into the clouds. These interactions include adjustments to...
Topics: Abel, S., Bay Area Environmental Research Inst., Colorado Univ., Exeter Univ., Flynn, C., Formenti,...
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Closed captions transcript: 00:00:00 He did abusing power the whole impeachment thing is 00:00:03 a hoax Saager Magni Washington the House vote after 6 hours of debate is expected 00:00:09 to follow strict party lines with the Democrats for and the Republicans against 00:00:12 impeachment that could coincide with President Trump's appearance at 00:00:15 a campaign rally in Michigan University of Virginia presidential historian Barbara 00:00:20 Perry says Donald Trump's legacy will be stained in...
Topics: Radio Program, Constitutional law, Oak Ridge Associated Universities, Chief executive officers,...
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