The Space Station Module/Power Management and Distribution (SSM/PMAD) testbed was developed to study the tertiary power management on modules in large spacecraft. The main goal was to study automation techniques, not necessarily develop flight ready systems. Because of the confidence gained in many of automation strategies investigated, it is appropriate to study, in more detail, implementation strategies in order to find better trade-offs for nearer to flight ready systems. These trade-offs...
Topics: NASA Technical Reports Server (NTRS), AUTOMATIC CONTROL, CONTROL SYSTEMS DESIGN, ENERGY...
Store pitch flexibility effect on flutter characteristics of wing-store configurations in transonic wind tunnel
Topic: NASA Technical Reports Server (NTRS)
The overall performance and detailed stator performance of a negative hub reaction turbine design featuring a moderately low solidity jet flap stator and a jet flap rotor were determined. Testing was conducted over a range of turbine expansion ratios at design speed. At each expansion ratio, the stator jet flow and rotor jet flow ranged up to about 7 and 8 percent, respectively, of the turbine inlet flow. The performance of the jet flap stator/jet flap rotor turbine was compared with that of a...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC CHARACTERISTICS, JET FLAPS, TURBINE BLADES, INLET...
Topic: NASA Technical Reports Server (NTRS)
Aqueous and thermal processing of primordial material occurred prior to and during planet formation in the early solar system. A record of how solid materials were altered at this time is present in the carbonaceous chondrites, which are naturally delivered fragments of primitive asteroids. It has been proposed that some materials, such as the clasts termed dark inclusions found in type III chondrites, suggest a sequence of aqueous and thermal events. Lithium isotopes (Li-6 and Li-7) can reveal...
Topics: NASA Technical Reports Server (NTRS), INCLUSIONS, LITHIUM ISOTOPES, ALLENDE METEORITE, PLANETARY...
Electronic circuitry automatically calculates cardiac output. This computer is used for basic research in physiology and as a diagnostic instrument by doctors.
Topic: NASA Technical Reports Server (NTRS)
Measurement of fatigue crack propagation in aluminum alloys at high stress
Topic: NASA Technical Reports Server (NTRS)
Launch window characteristics for manned interplanetary stopover flights to Mars and Venus
Topic: NASA Technical Reports Server (NTRS)
Propulsion and weight analyses of mini-cavity reactor rocket engine concept
Topic: NASA Technical Reports Server (NTRS)
The state of the art in portable oxygen breathing equipment is reported. Considered are self-containing as well as chemically generating oxygen sources and their effectiveness and limitations in mine rescue operations.
Topics: NASA Technical Reports Server (NTRS), EMERGENCY LIFE SUSTAINING SYSTEMS, MINES (EXCAVATIONS),...
By interrupting lines of stress with convolutions, structure can be designed to contain pressure, operate at cryogenic and high temperatures, and provide flexibility necessary for repetitive cycles of parallel-offset shear translation.
Topics: NASA Technical Reports Server (NTRS), HIGH TEMPERATURE RESEARCH, LOW TEMPERATURE TESTS, PRESSURE...
Results of a mission engineering analysis of nuclear-thermionic electric propulsion spacecraft for unmanned interplanetary and geocentric missions are summarized. Critical technologies associated with the development of nuclear electric propulsion (NEP) are assessed. Outer planet and comet rendezvous mission analysis, NEP stage design for geocentric and interplanetary missions, NEP system development cost and unit costs, and technology requirements for NEP stage development are studied. The NEP...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC PROPULSION, SPACECRAFT PROPULSION, THERMIONIC POWER...
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
A developmental approach to the study of the emergence of mental operational structures in neural networks is presented. Neural architectures proposed to underlie the six stages of the sensory-motor period are discussed.
Topics: NASA Technical Reports Server (NTRS), ARTIFICIAL INTELLIGENCE, COGNITIVE PSYCHOLOGY, NEURAL NETS,...
For rendezvous and docking, assessing and tracking relative orientation is necessary within a minimum approach distance. Special target light patterns have previously been considered for use with video sensors for ease of determining relative orientation. A generalization of those approaches is addressed. At certain ranges, the entire structure of the target vehicle constitutes an acceptable target; at closer ranges, substructures will suffice. Acting on the same principle as the human...
Topics: NASA Technical Reports Server (NTRS), AUTONOMOUS NAVIGATION, ORBITAL RENDEZVOUS, SPACECRAFT...
The TATSS Project's goal was to develop a design for computer software that would support the attainment of the following objectives for the air traffic simulation model: (1) Full freedom of movement for each aircraft object in the simulation model. Each aircraft object may follow any designated flight plan or flight path necessary as required by the experiment under consideration. (2) Object position precision up to +/- 3 meters vertically and +/- 15 meters horizontally. (3) Aircraft...
Topics: NASA Technical Reports Server (NTRS), AIR TRAFFIC, AIR TRAFFIC CONTROL, CIVIL AVIATION, COMPUTER...
No abstract available
Topic: NASA Technical Reports Server (NTRS)
Noise signal analysis of coherent optical data processing, and correlation and spectrum analysis of holograms
Topic: NASA Technical Reports Server (NTRS)
Interface propellant filters tested for contamination holding capacity using water with particles between 0 to 100 microns
Topic: NASA Technical Reports Server (NTRS)
Interferometric measurement of conductor spacing in flat conductor cables
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Shape data and varying lift drag ratios for all-flexible parawing system moments of inertia and center of gravity locations
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Acoustic grenade experiments to monitor transition in thermal structure of mesosphere
Topic: NASA Technical Reports Server (NTRS)
Sequential stochastic techniques for trajectory estimation
Topic: NASA Technical Reports Server (NTRS)
Potential for advancement of astronomy by space programs
Topic: NASA Technical Reports Server (NTRS)
Algorithm provides for automatic input data preparation for the analysis of continuous domains in the fields of structural analysis, heat transfer, and fluid mechanics. The computer program utilizes the natural coordinate systems concept and the finite element method for data generation.
Topic: NASA Technical Reports Server (NTRS)
Analyzer extends the range and resolution of a digital spectrum analyzer without placing stringent stability requirements on the sampling rate. It compares an unknown signal with a stable frequency standard.
Topic: NASA Technical Reports Server (NTRS)
Aluminum-thermal difference link maintains constant length of strut despite environmental temperature changes. An extension spring decreases load on the compensator drive linkage when strut is in tension, when strut is in compression, a compression spring is used. Perforated titanium outer tube exposes link to external heat.
Topic: NASA Technical Reports Server (NTRS)
Investigation determines structural potential of asbestos fibrils. Methods are developed for dispersing macrofibers of the asbestos into colloidal-sized ultimate fibrils and incorporating these fibrils in matrices without causing reagglomeration.
Topic: NASA Technical Reports Server (NTRS)
Cold cathode ionization source generates smaller amounts of spurious gases and has a higher sensitivity than commonly used hot-filament ion sources. Photon and X-ray background noise are reduced below detectable levels.
Topic: NASA Technical Reports Server (NTRS)
Filters, formed by combinations of distributed RC elements with positive-feedback voltage amplifiers, provide transfer functions similar to those the heavier LC filters ordinarily employ. They also provide signal amplification.
Topic: NASA Technical Reports Server (NTRS)
Columbium specimens are charged uniformly with hydrogen allowing accurate measurement of the hydrogen content by a procedure involving the removal of hydrogen from flowing argon at 2000 degrees F. Hydrogen content effects on the ductile-to-transition temperature are determined for temperatures between 200 and 600 degrees F.
Topic: NASA Technical Reports Server (NTRS)
Converter uses solid-state ac-to-dc rectification circuitry, filter circuitry, a tuned transformer, ac chopper circuitry, and an automatic current-control network. It has a dc power source which operates from 5 to 100 percent load at a 72 to 94 input to output efficiency.
Topic: NASA Technical Reports Server (NTRS)
Steam filament solution determines velocity distribution due to potential flow in the blade-to-blade plane of the radial impeller. This is used to determine the mass-averaged relative fluid angle, which is in turn used in an axisymmetric program to obtain steam surfaces of the assumed axisymmetric flow.
Topic: NASA Technical Reports Server (NTRS)
Diisopropyl peroxydicarbonate dissolved in liquid perfluorobutadiene is conducted in a sealed vessel at the autogenous pressure of polymerization. Reaction temperature, ratio of catalyst to monomer, and amount of agitation determine degree of polymerization and product yield.
Topic: NASA Technical Reports Server (NTRS)
Mercury-column electrochemical coulometer is a linear ampere-hour integrating device consisting of a sealed glass tube containing two columns of mercury separated by a gap containing an electrolyte. The drive circuit uses operational amplifier techniques to match nonlinear charge-discharge characteristics of an alkaline battery.
Topic: NASA Technical Reports Server (NTRS)
Digital ranging system measures slant range /from 500 feet to 200 nautical miles/ and provides digital range readout during range tracking between any two airborne vehicles.
Topic: NASA Technical Reports Server (NTRS)
Overlay is aligned with four calibration dots so it is not affected by CRT drift or changes in vertical or horizontal gain when producing Nyquist /frequency-response phase/amplitude/ plots. Method produces over 50 plots per hour.
Topic: NASA Technical Reports Server (NTRS)
Noncontacting-strain-measuring gauge and extensometer remotely measures the mechanical displacement along the entire length of a test specimen. Measurement is accomplished by continuous scanning of a reflected light from reflective bench markings or stripes previously affixed to the specimen.
Topic: NASA Technical Reports Server (NTRS)
Balanced bridge circuit, supplied with low-voltage direct current and connected to a readout device, measures remaining brush material, rate of brush wear, armature runout, and brush signature.
Topic: NASA Technical Reports Server (NTRS)
Age hardening in Inconel 718 is investigated using Brinell hardness measurements. Formation of a precipitate causes an increase in hardness.
Topic: NASA Technical Reports Server (NTRS)
Dry column chromatography principles applied in microscale produce technique to minimize time in preparing and analyzing colorless constituents of soluble mixtures. Glass pipette microcolumns filled with finely sieved adsorbents permit capillary attraction and separation in 3 to 15 minutes. Technique is adaptable to gas chromatography.
Topic: NASA Technical Reports Server (NTRS)
Antenna pattern recording system has a discretionary signal level monitor which senses a specified minimum level occurring between sampling intervals. This enables RF power and percent coverage to be calculated more accurately.
Topic: NASA Technical Reports Server (NTRS)
In holographic interferometry a small movement of apparatus between exposures causes the background of the reconstructed scene to be covered with interference fringes approximately parallel to each other. The three-dimensional quality of the holographic image is allowable since a mathematical model will give the location of the fringes.
Topic: NASA Technical Reports Server (NTRS)
Microminiature slide action valve requires power only during actuation and can be used as an on-off or single inlet to alternately selected outlets.
Topic: NASA Technical Reports Server (NTRS)
Complementary p-n-p transistor, used as the load resistor in an integrated circuit, reduces the switching time and the steady state dc current, and allows for a lower supply voltage. Current limiting is achieved by a novel unity-gain transistor.
Topic: NASA Technical Reports Server (NTRS)
