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Mechanical Properties and Microstructure of Biomorphic Silicon Carbide Ceramics Fabricated from Wood Precursors (Paperback):... Mechanical Properties and Microstructure of Biomorphic Silicon Carbide Ceramics Fabricated from Wood Precursors (Paperback)
Nasa Technical Reports Server (Ntrs)
R292 R242 Discovery Miles 2 420 Save R50 (17%) Ships in 7 - 11 working days

Silicon carbide based, environment friendly, biomorphic ceramics have been fabricated by the pyrolysis and infiltration of natural wood (maple and mahogany) precursors. This technology provides an eco-friendly route to advanced ceramic materials. These biomorphic silicon carbide ceramics have tailorable properties and behave like silicon carbide based materials manufactured by conventional approaches. The elastic moduli and fracture toughness of biomorphic ceramics strongly depend on the properties of starting wood preforms and the degree of molten silicon infiltration. Mechanical properties of silicon carbide ceramics fabricated from maple wood precursors indicate the flexural strengths of 3441+/-58 MPa at room temperature and 230136 MPa at 1350C. Room temperature fracture toughness of the maple based material is 2.6 +/- 0.2 MPa(square root of)m while the mahogany precursor derived ceramics show a fracture toughness of 2.0 +/- 0.2 Mpa(square root of)m. The fracture toughness and the strength increase as the density of final material increases. Fractographic characterization indicates the failure origins to be pores and chipped pockets of silicon.

1dvar Analysis of Temperature and Humidity Using GPS Radio Occultation Data (Paperback): Nasa Technical Reports Server (Ntrs) 1dvar Analysis of Temperature and Humidity Using GPS Radio Occultation Data (Paperback)
Nasa Technical Reports Server (Ntrs)
R317 R264 Discovery Miles 2 640 Save R53 (17%) Ships in 7 - 11 working days

The NASA Technical Reports Server (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.

A Preliminary Investigation of Aerogravity Assist at Triton for Capture Into Orbit about Neptune (Paperback): Nasa Technical... A Preliminary Investigation of Aerogravity Assist at Triton for Capture Into Orbit about Neptune (Paperback)
Nasa Technical Reports Server (Ntrs)
R274 R227 Discovery Miles 2 270 Save R47 (17%) Ships in 7 - 11 working days

Previous work by our group has shown that an aerogravity assist maneuver at the moon Triton might be used to capture a spacecraft into a closed orbit about Neptune if a nominal atmospheric density profile at Triton is assumed. The present study extends that work and examines the impact of atmospheric dispersions, especially important in light of the very low density and large degree of uncertainty of Triton s atmosphere. Additional variables that are analyzed in the current study include ballute size and cut time and variations in the final target orbit. Results indicate that while blunt-body, rigid aeroshells penetrate too closely to the surface to be practical, ballutes of modest size show promise for this maneuver. Future studies will examine the application of inflatable aeroshells and rigid aeroshells with higher lift-to-drag ratios such as biconics and lifting bodies.

Hydrogen-Oxygen Pem Regenerative Fuel Cell Energy Storage System (Paperback): Nasa Technical Reports Server (Ntrs), et al Hydrogen-Oxygen Pem Regenerative Fuel Cell Energy Storage System (Paperback)
Nasa Technical Reports Server (Ntrs), et al; David J. Bents
R320 Discovery Miles 3 200 Ships in 7 - 11 working days

An introduction to the closed cycle hydrogen-oxygen polymer electrolyte membrane (PEM) regenerative fuel cell (RFC), recently constructed at NASA Glenn Research Center, is presented. Illustrated with explanatory graphics and figures, this report outlines the engineering motivations for the RFC as a solar energy storage device, the system requirements, layout and hardware detail of the RFC unit at NASA Glenn, the construction history, and test experience accumulated to date with this unit.

Theoretical Determination of Axial Fan Performance (Paperback): E. Struve Theoretical Determination of Axial Fan Performance (Paperback)
E. Struve; Created by Nasa Technical Reports Server (Ntrs)
R413 R350 Discovery Miles 3 500 Save R63 (15%) Ships in 7 - 11 working days

The report presents a method for the computation of axial fan characteristics. The method is based on the assumption that the law of constancy of the circulation along the blade holds, approximately, for all fan conditions for which the blade elements operate at normal angles of attack (up to the stalling angles). Pressure head coefficient K(sub a) and power coefficient K(sub u) for the force components in the axial and tangential directions, respectively, and analogous to the lift and drag coefficients C(sub y) and C(sub x) are conveniently introduced.

A Hierarchical Approach to Fracture Mechanics (Paperback): Nasa Technical Reports Server (Ntrs) A Hierarchical Approach to Fracture Mechanics (Paperback)
Nasa Technical Reports Server (Ntrs); Erik Seather, Shloma Taasan
R320 Discovery Miles 3 200 Ships in 7 - 11 working days

Recent research conducted under NASA LaRC's Creativity and Innovation Program has led to the development of an initial approach for a hierarchical fracture mechanics. This methodology unites failure mechanisms occurring at different length scales and provides a framework for a physics-based theory of fracture. At the nanoscale, parametric molecular dynamic simulations are used to compute the energy associated with atomic level failure mechanisms. This information is used in a mesoscale percolation model of defect coalescence to obtain statistics of fracture paths and energies through Monte Carlo simulations. The mathematical structure of predicted crack paths is described using concepts of fractal geometry. The non-integer fractal dimension relates geometric and energy measures between meso- and macroscales. For illustration, a fractal-based continuum strain energy release rate is derived for inter-and transgranular fracture in polycrystalline metals.

Evaluation of Microcracking in Two Carbon-Fiber/Epoxy-Matrix Composite Cryogenic Tanks (Paperback): A. J. Hodge Evaluation of Microcracking in Two Carbon-Fiber/Epoxy-Matrix Composite Cryogenic Tanks (Paperback)
A. J. Hodge; Created by Nasa Technical Reports Server (Ntrs)
R274 R227 Discovery Miles 2 270 Save R47 (17%) Ships in 7 - 11 working days

Two graphite/epoxy cryogenic pressure vessels were evaluated for microcracking. The X-33 LH2 tank lobe skins were extensively examined for microcracks. Specimens were removed from the inner skin of the X-33 tank for tensile testing. The data obtained from these tests were used to model expected microcrack density as a function of stress. Additionally, the laminate used in the Marshall Space Flight Center (MSFC) Composite Conformal, Cryogenic, Common Bulkhead, Aerogel-Insulated Tank (CBAT) was evaluated. Testing was performed in an attempt to predict potential microcracking during testing of the CBAT.

Development of a Fabry-Perot Interferometer for Ultra-Precise Measurements of Column Co2 (Paperback): Emily L. Wilson Development of a Fabry-Perot Interferometer for Ultra-Precise Measurements of Column Co2 (Paperback)
Emily L. Wilson; Created by Nasa Technical Reports Server (Ntrs), et al
R294 R244 Discovery Miles 2 440 Save R50 (17%) Ships in 7 - 11 working days

A passive Fabry-Perot based instrument is described for detecting column CO2 through absorption measurements at 1.58 microns . In this design, solar flux reaches the instrument platform and is directed through two channels. In the first channel, transmittance fi5nges from a Fabry-Perot interferometer are aligned with CO2 absorption lines so that absorption due to CO2 is primarily detected. The second channel encompasses the same frequency region as the first, but is comparatively more sensitive to changes in the solar flux than absorption due to CO2. The ratio of these channels is sensitive to changes in the total CO2 column, but not to changes in solar flux. This inexpensive instrument will offer high precision measurements (error 4%) in a compact package. Design of this instrument and preliminary ground-based measurements of column CO2 are presented here as well as strategies for deployment on aircraft and satellite platforms.

The Apollo Capsule Optimization for Improved Stability and Computational Experimental Data Comparisons (Paperback): Nasa... The Apollo Capsule Optimization for Improved Stability and Computational Experimental Data Comparisons (Paperback)
Nasa Technical Reports Server (Ntrs)
R340 R285 Discovery Miles 2 850 Save R55 (16%) Ships in 7 - 11 working days

Numerical optimization was employed on the Apollo Command Module to modify its external shape. The Apollo Command Module (CM) that was used on all NASA human space flights during the Apollo Space Program is stable and trimmed in an apex forward (alpha of approximately 40 to 80 degrees) position. This poses a safety risk if the CM separates from the launch tower during abort. Optimization was employed on the Apollo CM to remedy the undesirable stability characteristics of the configuration. Geometric shape changes were limited to axisymmetric modifications that altered the radius of the apex (R(sub A)), base radius (R(sub O)), corner radius (R(sub C)), and the cone half angle (theta), while the maximum diameter of the CM was held constant. The results of multipoint optimization on the CM indicated that the cross-range performance can be improved while maintaining robust apex-aft stability with a single trim point. Navier-Stokes computations were performed on the baseline and optimized configurations and confirmed the Euler-based optimization results. Euler Analysis of ten alternative CM vehicles with different values of the above four parameters are compared with the published experimental results of numerous wind tunnel tests during the late 1960's. These comparisons cover a wide Mach number range and a full 180-degree pitch range and show that the Euler methods are capable of fairly accurate force and moment computations and can separate the vehicle characteristics of these ten alternative configurations.

Atmospheric Turbulence Modeling for Aero Vehicles - Fractional Order Fits (Paperback): Nasa Technical Reports Server (Ntrs) Atmospheric Turbulence Modeling for Aero Vehicles - Fractional Order Fits (Paperback)
Nasa Technical Reports Server (Ntrs)
R321 Discovery Miles 3 210 Ships in 7 - 11 working days

Atmospheric turbulence models are necessary for the design of both inlet/engine and flight controls, as well as for studying coupling between the propulsion and the vehicle structural dynamics for supersonic vehicles. Models based on the Kolmogorov spectrum have been previously utilized to model atmospheric turbulence. In this paper, a more accurate model is developed in its representative fractional order form, typical of atmospheric disturbances. This is accomplished by first scaling the Kolmogorov spectral to convert them into finite energy von Karman forms and then by deriving an explicit fractional circuit-filter type analog for this model. This circuit model is utilized to develop a generalized formulation in frequency domain to approximate the fractional order with the products of first order transfer functions, which enables accurate time domain simulations. The objective of this work is as follows. Given the parameters describing the conditions of atmospheric disturbances, and utilizing the derived formulations, directly compute the transfer function poles and zeros describing these disturbances for acoustic velocity, temperature, pressure, and density. Time domain simulations of representative atmospheric turbulence can then be developed by utilizing these computed transfer functions together with the disturbance frequencies of interest.

Acoustic Measurements of Rectangular Nozzles with Bevel (Paperback): James E. Bridges Acoustic Measurements of Rectangular Nozzles with Bevel (Paperback)
James E. Bridges; Created by Nasa Technical Reports Server (Ntrs)
R293 R243 Discovery Miles 2 430 Save R50 (17%) Ships in 7 - 11 working days

A series of convergent rectangular nozzles of aspect ratios 2:1, 4:1, and 8:1 were constructed with uniform exit velocity profiles. Additional nozzles were constructed that extended the wide lip on one side of these nozzles to form beveled nozzles. Far-field acoustic measurements were made and analyzed, and the results presented. The impact of aspect ratio on jet noise was similar to that of enhanced mixing devices: reduction in aft, peak frequency noise with an increase in broadside, high frequency noise. Azimuthally, it was found that rectangular jets produced more noise directed away from their wide sides than from their narrow sides. The azimuthal dependence decreased at aft angles where noise decreased. The effect of temperature, keeping acoustic Mach number constant, was minimal. Since most installations would have the observer on the wide size of the nozzle, the increased high frequency noise has a deleterious impact on the observer. Extending one wide side of the rectangular nozzle, evocative of an aft deck in an installed propulsion system, increased the noise of the jet with increasing length. The impact of both aspect ratio and bevel length were relatively well behaved, allowing a simple bilinear model to be constructed relative to a simple round jet.

Basic Differential Equations in General Theory of Elastic Shells (Paperback): Nasa Technical Reports Server (Ntrs) Basic Differential Equations in General Theory of Elastic Shells (Paperback)
Nasa Technical Reports Server (Ntrs); V. S. Vlasov
R368 Discovery Miles 3 680 Ships in 7 - 11 working days

The shell shall be considered as a three-dimensional continuous medium; for the coordinate surface, the middle surface of the shell shall be assumed parallel to the bounding surfaces. Let alpha and beta be the curvilinear orthogonal coordinates of this surface, coinciding with the lines of principal curvatures, and gamma the distance along the normal from the point (alpha, beta) of the coordinate surface to any point (alpha, beta, gamma) of the she

Analysis of Water Extraction from Lunar Regolith (Paperback): Nasa Technical Reports Server (Ntrs) Analysis of Water Extraction from Lunar Regolith (Paperback)
Nasa Technical Reports Server (Ntrs)
R298 Discovery Miles 2 980 Ships in 7 - 11 working days

Distribution of water concentration on the Moon is currently an area of active research. Recent studies suggest the presence of ice particles, and perhaps even ice blocks and ice-cemented regolith on the Moon. Thermal extraction of the in-situ water is an attractive means of satisfying water requirements for a lunar mission. In this paper, a model is presented to analyze the processes occurring during the heat-up of icy regolith and extraction of the evolved water vapor. The wet regolith is assumed to be present in an initially evacuated and sealed cell which is subsequently heated. The first step of the analysis involves calculating the gradual increase of vapor pressure in the closed cell as the temperature is raised. Then, in the second step, the cell is evacuated to low pressure (e.g., vacuum), allowing the water vapor to leave the cell and be captured. The parameters affecting water vapor pressure build-up and evacuation for the purpose of extracting water from lunar regolith are discussed in the paper. Some comparisons with available experimental measurements are also made.

Traffic Flow Management - Data Mining Update (Paperback): Nasa Technical Reports Server (Ntrs) Traffic Flow Management - Data Mining Update (Paperback)
Nasa Technical Reports Server (Ntrs); Shon R. Grabbe
R324 Discovery Miles 3 240 Ships in 7 - 11 working days

This presentation provides an update on recent data mining efforts that have been designed to (1) identify like/similar days in the national airspace system, (2) cluster/aggregate national-level rerouting data and (3) apply machine learning techniques to predict when Ground Delay Programs are required at a weather-impacted airport

NASA/Gsfc's Flight Software Core Flight System (Paperback): Nasa Technical Reports Server (Ntrs) NASA/Gsfc's Flight Software Core Flight System (Paperback)
Nasa Technical Reports Server (Ntrs); David McComas
R321 Discovery Miles 3 210 Ships in 7 - 11 working days

The NASA Technical Reports Servcr (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.

Propulsion Test Handbook - Msfc and Ssc (Paperback): Nasa Technical Reports Server (Ntrs) Propulsion Test Handbook - Msfc and Ssc (Paperback)
Nasa Technical Reports Server (Ntrs); John M. Hammond
R742 Discovery Miles 7 420 Ships in 7 - 11 working days

This Handbook was prepared to provide Propulsion Test Personnel a central source of fundamental reference material. The Testing Process, which is a three-part process of pre-test activities, testing, and post-test activities, involves a collaborative effort from the mechanical, electrical, safety, and environmental disciplines in the test environment. Pre-test activities, testing, and post-test activities processes will vary, per test requirements; however, the content of this Handbook should cover basic procedures and standards that are shared across Centers.

ISS Solar Array Alpha Rotary Joint (Sarj) Bearing Failure and Recovery - Technical and Project Management Lessons Learned... ISS Solar Array Alpha Rotary Joint (Sarj) Bearing Failure and Recovery - Technical and Project Management Lessons Learned (Paperback)
Nasa Technical Reports Server (Ntrs)
R319 Discovery Miles 3 190 Ships in 7 - 11 working days

The photovoltaic solar panels on the International Space Station (ISS) track the Sun through continuous rotating motion enabled by large bearings on the main truss called solar array alpha rotary joints (SARJs). In late 2007, shortly after installation, the starboard SARJ had become hard to turn and had to be shut down after exceeding drive current safety limits. The port SARJ, of the same design, had been working well for over 2 years. An exhaustive failure investigation ensued that included multiple extravehicular activities to collect information and samples for engineering forensics, detailed structural and thermal analyses, and a careful review of the build records. The ultimate root cause was determined to be kinematic design vulnerability coupled with inadequate lubrication, and manufacturing flaws; this was corroborated through ground tests, metallurgical studies, and modeling. A highly successful recovery plan was developed and implemented that included replacing worn and damaged components in orbit and applying space-compatible grease to improve lubrication. Beyond the technical aspects, however, lie several key programmatic lessons learned. These lessons, such as running ground tests to intentional failure to experimentally verify failure modes, are reviewed and discussed so they can be applied to future projects to avoid such problems.

A Multiagent Modeling Environment for Simulating Work Practice in Organizations (Paperback): Nasa Technical Reports Server... A Multiagent Modeling Environment for Simulating Work Practice in Organizations (Paperback)
Nasa Technical Reports Server (Ntrs)
R320 Discovery Miles 3 200 Ships in 7 - 11 working days

The NASA Technical Reports Server (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.

Fischer-Tropsch Catalyst for Aviation Fuel Production (Paperback): Nasa Technical Reports Server (Ntrs), et al Fischer-Tropsch Catalyst for Aviation Fuel Production (Paperback)
Nasa Technical Reports Server (Ntrs), et al; Ana B. Delaree
R299 Discovery Miles 2 990 Ships in 7 - 11 working days

As the oil supply declines, there is a greater need for cleaner alternative fuels. There will undoubtedly be a shift from crude oil to non-petroleum sources as a feedstock for aviation (and other transportation) fuels. The Fischer-Tropsch process uses a gas mixture of carbon monoxide and hydrogen which is converted into various liquid hydrocarbons; this versatile gas-to-liquid technology produces a complex product stream of paraffins, olefins, and oxygenated compounds such as alcohols and aldehydes. The Fischer-Tropsch process can produce a cleaner diesel oil fraction with a high cetane number (typically above 70) without any sulfur and aromatic compounds. It is most commonly catalyzed by cobalt supported on alumina, silica, or titania or unsupported alloyed iron powders. Cobalt is typically used more often than iron, in that cobalt is a longer-active catalyst, has lower water-gas shift activity, and lower yield of modified products. Promoters are valuable in improving Fischer-Tropsch catalyst as they can increase cobalt oxide dispersion, enhance the reduction of cobalt oxide to the active metal phase, stabilize a high metal surface area, and improve mechanical properties. Our goal is to build up the specificity of the Fischer-Tropsch catalyst while adding less-costly transition metals as promoters; the more common promoters used in Fischer-Tropsch synthesis are rhenium, platinum, and ruthenium. In this report we will describe our preliminary efforts to design and produce catalyst materials to achieve our goal of preferentially producing C8 to C18 paraffin compounds in the NASA Glenn Research Center Gas-To-Liquid processing plant. Efforts at NASA Glenn Research Center for producing green fuels using non-petroleum feedstocks support both the Sub-sonic Fixed Wing program of Fundamental Aeronautics and the In Situ Resource Utilization program of the Exploration Technology Development and Demonstration program.

Rate-Compatible Protograph Ldpc Code Families with Linear Minimum Distance (Paperback): Nasa Technical Reports Server (Ntrs) Rate-Compatible Protograph Ldpc Code Families with Linear Minimum Distance (Paperback)
Nasa Technical Reports Server (Ntrs)
R299 Discovery Miles 2 990 Ships in 7 - 11 working days

The NASA Technical Reports Server (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.

Trmm Precipitation Radar Reflectivity Profiles Compared to High-Resolution Airborne and Ground-Based Radar Measurements... Trmm Precipitation Radar Reflectivity Profiles Compared to High-Resolution Airborne and Ground-Based Radar Measurements (Paperback)
Nasa Technical Reports Server (Ntrs), et al; G. M. Heymsfield
R369 Discovery Miles 3 690 Ships in 7 - 11 working days

The NASA Technical Reports Server (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.

Slip Analysis in a Ni-Base Superalloy (Paperback): Nasa Technical Reports Server (Ntrs) Slip Analysis in a Ni-Base Superalloy (Paperback)
Nasa Technical Reports Server (Ntrs)
R292 R242 Discovery Miles 2 420 Save R50 (17%) Ships in 7 - 11 working days

The NASA Technical Reports Server (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.

Dimensionality Reduction Through Classifier Ensembles (Paperback): Nasa Technical Reports Server (Ntrs) Dimensionality Reduction Through Classifier Ensembles (Paperback)
Nasa Technical Reports Server (Ntrs)
R319 Discovery Miles 3 190 Ships in 7 - 11 working days

In data mining, one often needs to analyze datasets with a very large number of attributes. Performing machine learning directly on such data sets is often impractical because of extensive run times, excessive complexity of the fitted model (often leading to overfitting), and the well-known "curse of dimensionality." In practice, to avoid such problems, feature selection and/or extraction are often used to reduce data dimensionality prior to the learning step. However, existing feature selection/extraction algorithms either evaluate features by their effectiveness across the entire data set or simply disregard class information altogether (e.g., principal component analysis). Furthermore, feature extraction algorithms such as principal components analysis create new features that are often meaningless to human users. In this article, we present input decimation, a method that provides "feature subsets" that are selected for their ability to discriminate among the classes. These features are subsequently used in ensembles of classifiers, yielding results superior to single classifiers, ensembles that use the full set of features, and ensembles based on principal component analysis on both real and synthetic datasets.

Modeling the Performance of Direct-Detection Doppler Lidar Systems in Real Atmospheres (Paperback): Matthew J McGill Modeling the Performance of Direct-Detection Doppler Lidar Systems in Real Atmospheres (Paperback)
Matthew J McGill; Created by Nasa Technical Reports Server (Ntrs), et al
R294 R245 Discovery Miles 2 450 Save R49 (17%) Ships in 7 - 11 working days

Previous modeling of the performance of spaceborne direct-detection Doppler lidar systems has assumed extremely idealized atmospheric models. Here we develop a technique for modeling the performance of these systems in a more realistic atmosphere, based on actual airborne lidar observations. The resulting atmospheric model contains cloud and aerosol variability that is absent in other simulations of spaceborne Doppler lidar instruments. To produce a realistic simulation of daytime performance, we include solar radiance values that are based on actual measurements and are allowed to vary as the viewing scene changes. Simulations are performed for two types of direct-detection Doppler lidar systems: the double-edge and the multi-channel techniques. Both systems were optimized to measure winds from Rayleigh backscatter at 355 nm. Simulations show that the measurement uncertainty during daytime is degraded by only about 10-20% compared to nighttime performance, provided a proper solar filter is included in the instrument design.

The Corsair Turbomachinery Code - Status and Plans (Paperback): Nasa Technical Reports Server (Ntrs) The Corsair Turbomachinery Code - Status and Plans (Paperback)
Nasa Technical Reports Server (Ntrs)
R294 R245 Discovery Miles 2 450 Save R49 (17%) Ships in 7 - 11 working days

The NASA Technical Reports Server (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.

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