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  • 1
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    A Well-Defined Bipolar Outflow Shell (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: We report in this letter the results of a study of the massive bipolar outflow in the central region of the giant molecular cloud Monoceros R2.
    Keywords: Astrophysics
    Type: Astrophysical Journal Letter
    Format: text
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  • 2
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    Cometary Globules in the South-East Quadrant of the Rosette Nebula (1993)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: a study of newly identified cometary globules in the south-east quadrant of the Rosette Nebula using the J=1-0 transition of carbon monoxide.
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  • 3
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    Testing the Bipolar Outflow Models: A Well-Shaped Bipolar Outflow Shell in Mon R2 (1993)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: We identify in our CO J = 1 - 0 maps an.
    Keywords: Astronomy
    Format: text
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  • 4
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    A fully vectorized numerical solution of the incompressible Navier-Stokes equations (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A vectorizable algorithm is presented for the implicit finite difference solution of the incompressible Navier-Stokes equations in general curvilinear coordinates. The unsteady Reynolds averaged Navier-Stokes equations solved are in two dimension and non-conservative primitive variable form. A two-layer algebraic eddy viscosity turbulence model is used to incorporate the effects of turbulence. Two momentum equations and a Poisson pressure equation, which is obtained by taking the divergence of the momentum equations and satisfying the continuity equation, are solved simultaneously at each time step. An elliptic grid generation approach is used to generate a boundary conforming coordinate system about an airfoil. The governing equations are expressed in terms of the curvilinear coordinates and are solved on a uniform rectangular computational domain. A checkerboard SOR, which can effectively utilize the computer architectural concept of vector processing, is used for iterative solution of the governing equations.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-174496 , NAS 1.26:174496
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  • 5
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    Studies of opposed jet diffusion flames. I - Temperature distribution (1970)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Temperature distribution in opposed jet diffusion flames, discussing mass fluxes and fuel and oxygen concentrations effect
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: ; ADEMIE DES SCIENCES
    Format: text
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  • 6
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    A vectorized solution for incompressible flow (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: An algorithm is developed to obtain solutions to the unsteady Reynolds-averaged incompressible Navier-Stokes equations in general curvilinear coordinates on a vector processor. The governing equations are in nonconservative form with the velocity and pressure as dependent variables. Two momentum equations and the Poisson equation for pressure form a set of three governing equations for three flow field unknowns: u, v, and p. The governing equations and boundary conditions are expressed in terms of boundary-conforming curvilinear coordinates, and a checkerboard SOR iteration is used to solve the governing equations. Several possible sequences for a checkerboard SOR iteration are investigated for finding the best overall convergence rate. The efficiency and capability of the present algorithm was assessed using the example of an 18 percent thick NACA 66(3)018 airfoil at zero degree angle of attack for chord Reynolds number range 1000-40,000.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 84-1534
    Format: text
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  • 7
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    Integration of Optical Coherence Tomography Scan Patterns to Augment Clinical Data Suite (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: Vision changes identified in long duration spaceflight astronauts has led Space Medicine at NASA to adopt a more comprehensive clinical monitoring protocol. Optical Coherence Tomography (OCT) was recently implemented at NASA, including on board the International Space Station in 2013. NASA is collaborating with Heidelberg Engineering to increase the fidelity of the current OCT data set by integrating the traditional circumpapillary OCT image with radial and horizontal block images at the optic nerve head. The retinal nerve fiber layer was segmented by two experienced individuals. Intra-rater (N=4 subjects and 70 images) and inter-rater (N=4 subjects and 221 images) agreement was performed. The results of this analysis and the potential benefits will be presented.
    Keywords: Aerospace Medicine
    Type: JSC-CN-40550 , NASA Human Research Program Investigators'' Workshop (HRP IWS 2018); Jan 22, 2018 - Jan 25, 2018; Galveston, TX; United States
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  • 8
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    Exploratory Analysis of Carbon Dioxide Levels, Ultrasound and Optical Coherence Tomography Measures of the Eye During ISS Missions (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: Enhanced screening for the Visual Impairment/Intracranial Pressure (VIIP) syndrome has been implemented to better characterize the ocular and vision changes observed in some long-duration crewmembers. This includes implementation of in-flight ultrasound in 2010 and optical coherence tomography (OCT) in 2013. Potential risk factors for VIIP include cardiovascular health, diet, anatomical and genetic factors, and environmental conditions. Carbon dioxide (CO2), a potent vasodilator, is chronically elevated on the International Space Station (ISS) relative to ambient levels on Earth, and is a plausible risk factor for VIIP. In an effort to understand the possible associations between CO2 and VIIP, this study explores the relationship of ambient CO2 levels on ISS compared to inflight ultrasound and OCT measures of the eye obtained from ISS crewmembers. CO2 measurements were aggregated from Operational Data Reduction Complex and Node 3 major constituent analyzers (MCAs) on ISS or from sensors located in the European Columbus module, as available. CO2 levels in the periods between each ultrasound and OCT session are summarized using timeseries metrics, including time-weighted means and variances. Partial least squares regression analyses are used to quantify the complex relationship between specific ultrasound and OCT measures and the CO2 metrics simulataneously. These analyses will enhance our understanding of the possible associations between CO2 levels and structural changes to the eye which will in turn inform future analysis of inflight VIIP data.
    Keywords: Life Sciences (General); Aerospace Medicine
    Type: JSC-CN-37739 , Human Research Program Investigators'' Workshop (2017 HRP IWS); Jan 23, 2017 - Jan 27, 2017; Galveston, TX; United States
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  • 9
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    Operational Transition from the First-Generation Heidelberg Spectralis Optical Coherence Tomography [OCT("OCT1")] to the Second-Generation Heidelberg Spectralis OCT("OCT2") (2018)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The Heidelberg Spectralis "OCT2", which recently became commercially available, is going to be implemented at the Johnson Space Center Flight Medicine Clinic and on board the International Space Station. Due to the increased scan rate of the "OCT2", this upgrade will allow for significant reduction in valuable crew testing time and also allow for additional capabilities, like OCT Angiography and Multi-Color Fundus Imaging. Due to the custom scans used to monitor Space Flight-Associated Neuro-ocular Syndrome (SANS) in our crewmembers, an evaluation to assess the impacts of transitioning from "OCT1" to "OCT2" was performed. An engineering assessment (N=1) was performed to identify any potential impacts of maintaining an "OCT1" on board ISS while implementing an "OCT2" in the JSC Clinic. "OCT2" implementation will lag JSC FMC clinical implementation due to the flight certification/manifestation process. The clinical assessment was performed (n=12) to identify any impacts due to the replacement of the "OCT1" with the "OCT2" to the longitudinal OCT data across a crewmember's mission/lifetime. The qualitative results from the engineering and clinical evaluation will be reported, as well as the quantitative assessment of the clinical variables
    Keywords: Optics; Aerospace Medicine
    Type: JSC-CN-40591 , Annual NASA Human Research Program Investigators'' Workshop (HRP IWS) 2018; Jan 22, 2018 - Jan 25, 2018; Galveston, TX; United States
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  • 10
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    Exploratory Analysis of Carbon Dioxide Levels, Ultrasound and Optical Coherence Tomography Measures of the Eye During ISS Missions (2017)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Carbon dioxide (CO2) levels on board the International Space Station (ISS) have typically averaged 2.3 to 5.3 mmHg, with large fluctuations occurring over periods of hours and days. CO2 has effects on cerebral vascular tone, resulting in vasodilation and alteration of cerebral blood flow (CBF). Increased CBF leads to elevated intracranial pressure (ICP), a factor leading to visual disturbances, headaches, and other central nervous system symptoms. Ultrasound of the optic nerve and optical coherence tomography (OCT) provide surrogate measurements of ICP; in-flight measurements of both were implemented as enhanced screening tools for the Visual Impairment/Intracranial Pressure (VIIP) syndrome. This analysis examines the relationships between ambient CO2 levels on ISS, ultrasound and OCT measures of the eye in an effort to understand how CO2 may possibly be associated with VIIP and to inform future analysis of in-flight VIIP data.
    Keywords: Aerospace Medicine
    Type: JSC-CN-38407 , 2017 NASA Human Research Program Investigators'' Workshop (HRP IWS 2017); Jan 23, 2017 - Jan 26, 2017; Galveston, TX; United States
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