241
241
Jun 27, 2010
06/10
by
Gullstrand, A
texts
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No Abstract Available
Topics: CATALYSTS, ELECTRIC POTENTIAL, ELECTRICAL MEASUREMENT, ELECTROLYTES
213
213
Jul 5, 2010
07/10
by
Zotikov, I. A
texts
eye 213
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No Abstract Available
Topics: ELECTRICAL MEASUREMENT, HIGH VOLTAGES, VOLTMETERS, LOSSLESS EQUIPMENT
254
254
Jun 26, 2010
06/10
by
Smith, D
texts
eye 254
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Brazing alloy adapted for brazing corrosion resistant steel to refractory metals, also for brazing refractory metals to other refractory metals
Topics: ELECTRIC CONNECTORS, ELECTRIC CURRENT, ELECTRICAL MEASUREMENT, STRAIN GAGES
416
416
Jun 26, 2010
06/10
by
Jackson, R. B
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Ammonia decontaminant control of oxygen difluoride and static and dynamic compatibility tests with plastic and elastomer materials
Topics: ELECTRICAL MEASUREMENT, HALL EFFECT, HALL GENERATORS, ELECTRICAL RESISTIVITY, TEMPERATURE...
623
623
Jun 21, 2010
06/10
by
Hanchey, K. K.; Kubik, J. S.; Mahan, J. C
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Development of device to prevent high voltage arcing in electron beam welding
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Topics: CAPACITANCE, PANELS, SOLAR CELLS, DIFFUSION COEFFICIENT, ELECTRICAL MEASUREMENT, LOADS (FORCES)
333
333
Jul 5, 2010
07/10
by
Adler, I.; Gorenstein, P., et al; Trombka, J.; Gerard, J.; Schmadebeck, R.; Lowman, P.; Blodgett, H.; Yin, L.; Eller, E.; Lamothe, R.
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The X-ray fluorescence spectrometer, carried in the SIM bay of the command service module was employed principally for compositional mapping of the lunar surface while in lunar orbit, and secondarily, for X-ray astronomical observations during the trans-earth coast. The lunar surface measurements involved observations of the intensity and characteristics energy distribution of the secondary or fluorescent X-rays produced by the interaction of solar X-rays with the lunar surface. The...
Topics: DIELECTRIC PROPERTIES, ELECTRICAL MEASUREMENT, REMOTE SENSORS, AIR, MICROWAVE RADIOMETERS,...
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190
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The author has identified the following significant results. The arrival of the so-called energy crisis makes the portion of this experiment dealing with land use climatology of more immediate significance than before, since in addition to helping to understand the processes of climatic change associated with urbanization, the knowledge obtained may be useful in assigning an energy balance impact factor to proposed changes in land use in and around cities. Thermal maps derived from S-192 data...
Topics: CHARGE CARRIERS, SEMICONDUCTORS (MATERIALS), DIELECTRIC PROPERTIES, ELECTRICAL MEASUREMENT,...
282
282
May 31, 2011
05/11
by
Bobskill, Glenn J.; Parikh, Paresh C.; Prabhu, Ramadas K.; Tyler, Erik D
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An aerodynamic database has been generated for the Mars Smart Lander Shelf-All configuration using computational fluid dynamics (CFD) simulations. Three different CFD codes, USM3D and FELISA, based on unstructured grid technology and LAURA, an established and validated structured CFD code, were used. As part of this database development, the results for the Mars continuum were validated with experimental data and comparisons made where applicable. The validation of USM3D and LAURA with the...
Topics: POLYETHYLENES, ELECTRICAL MEASUREMENT, ELECTRICAL RESISTIVITY, FIELD EFFECT TRANSISTORS,...
Most precise electrical impedance measurement procedures involve a voltage balance. A voltage balance is defined as the condition in which the difference between two voltages is driven to zero by independent injections. The uncertainty of the measured value directly depends on how close to zero the balance was driven in magnitude and phase. The uncertainty level required by current state-of-the art impedance experiments is on the order of one part per million. Traditionally, voltage balance has...
Topics: DTIC Archive, NAVAL ACADEMY ANNAPOLIS MD, *ELECTRICAL IMPEDANCE, ELECTRICAL MEASUREMENT,...
163
163
Jun 21, 2010
06/10
by
Euler, A.; Euler, H
texts
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Chemical analysis of formate and sugar formation from formaldehyde solutions
Topics: ACIDS, OSCILLOGRAPHS, SOLUTIONS, ALKALIES, CATHODES, ELECTRIC POTENTIAL, ELECTRICAL MEASUREMENT,...
This paper evaluates the accuracy of the pulse transit time method for determining diastolic blood pressure using intra-arterial blood pressure as a reference, First, the paper describes the method. Then it discusses two sets of measurements which were carried out to determine the accuracy of the method with cardiac operated patients and healthy young volunteers, The thus obtained accuracies were +0.7 mmHg +/- 10.7 mmHg for the cardiac patients and -6.6 mmHg +/- 10.5 mmHg for the young...
Topics: DTIC Archive, Sorvoja, H S, OULU UNIV (FINLAND), *ELECTRICAL MEASUREMENT, *BLOOD PRESSURE,...
A cell buffer with built-in testing mechanism is provided. The cell buffer provides the ability to measure voltage provided by a power cell. The testing mechanism provides the ability to test whether the cell buffer is functioning properly and thus providing an accurate voltage measurement. The testing mechanism includes a test signal-provider to provide a test signal to the cell buffer. During normal operation, the test signal is disabled and the cell buffer operates normally. During testing,...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC CELLS, ELECTRICAL MEASUREMENT, PATENTS, Ott, William...
13,622
14K
Jun 21, 2010
06/10
by
LIGUM, T. I
texts
eye 13,622
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AERODYNAMICS AND FLIGHT DYNAMICS OF TURBOJET AIRCRAFT
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Topics: ELECTRIC ARCS, ELECTRICAL RESISTIVITY, HIGH TEMPERATURE AIR, THERMAL CONDUCTIVITY, THERMAL PLASMAS,...
574
574
Aug 1, 2010
08/10
by
Welch, Peter J
texts
eye 574
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No Abstract Available
Topics: ELECTRIC FIELDS, ELECTRICAL MEASUREMENT, GROUND EFFECT (COMMUNICATIONS), LIGHTNING, RADIO DIRECTION...
469
469
Jun 27, 2010
06/10
by
Crutcher, H. L
texts
eye 469
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Atlantic tropical cyclone strike probabilities for selected stations during September
Topics: PERFORMANCE TESTS, THERMIONIC CONVERTERS, URANIUM OXIDES, ELECTRICAL MEASUREMENT, NUCLEAR FUELS,...
285
285
Jul 5, 2010
07/10
by
BOLTE, H.; LUEDERITZ, B
texts
eye 285
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A RESTING MEMBRANE POTENTIAL OF -99.6 MV, A THRESHOLD CURRENT OF 4.37 X 10 TO THE -8TH POWER A, AND A LATENCY TIME OF 27.2 MSEC. WAS FOUND IN PATIENTS WITH CHRONIC POTASSIUM DEFICIENCIES OF VARIOUS ORIGINS. IN COMPARISON TO CONTROLS IN HEALTHY PERSONS, THE RESTING MEMBRANE POTENTIAL WAS INCREASED BY 16.0 MV. THE THRESHOLD CURRENT DID NOT SHOW A STATISTICALLY SIGNIFICANT CHANGE. THE LATENCY TIME WAS INCREASED BY MORE THAN 100%; I.E., BY 15.3 MSEC. UNDER THE CONDITIONS OF GENERAL POTASSIUM...
Topics: ELECTRICAL RESISTIVITY, ROCKS, THERMODYNAMICS, CONDUCTIVE HEAT TRANSFER, ELECTRICAL MEASUREMENT,...
Floating electrometer eliminates major source of error since any leakage from electrometer case, which is at high voltage, appears only as load on high voltage supply and not as part of current being measured. Commands to and data from floating electrometer are transferred across high voltage interface by means of optical channels.
Topics: NASA Technical Reports Server (NTRS), CIRCUITS, ELECTRIC CURRENT, ELECTRICAL MEASUREMENT,...
Failure detection technique is based upon input-output ratios, which is independent of inverter loading. Since inverter has fixed relationship between V-in/V-out and I-in/I-out, failure detection criteria are based on this ratio, which is simply inverter transformer turns ratio, K, equal to primary turns divided by secondary turns.
Topics: NASA Technical Reports Server (NTRS), DETECTION, ELECTRICAL MEASUREMENT, FAILURE, INVERTERS,...
Vehicles were characterized for the state of the art assessment of electric vehicles. The vehicle evaluated was a Chevrolet Corvette converted to electric operation. The original internal combustion engine was replaced by an electric traction motor. Eighteen batteries supplied the electrical energy. A controller, an onboard battery charger, and several dashboard instruments completed the conversion. The emphasis was on the electrical portion of the drive train, although some analysis and...
Topics: NASA Technical Reports Server (NTRS), AUTOMOBILES, ELECTRIC BATTERIES, ELECTRIC MOTOR VEHICLES,...
The technology development of the 30 centimeter J series mercury ion thruster for prime propulsion application in solar electric propulsion systems is described. Thruster design is reviewed. A standardized set of test and data recording procedures formulated to allow for the characterization of the J series thruster is described. Characteristics measured are the magnetic baffle characterization, the neutralizer characterization, perveance, the minimum eV/ion measurement, and the electrical and...
Topics: NASA Technical Reports Server (NTRS), ELECTRICAL MEASUREMENT, ELECTROMAGNETIC PROPERTIES, MERCURY...
250
250
Jun 21, 2010
06/10
by
Kurzin, V. B
texts
eye 250
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Natural oscillations of gas flow about lattice of plates
Topics: CLOUD PHYSICS, ELECTRIC POTENTIAL, FLIGHT SAFETY, LIGHTNING, ROCKET FLIGHT, ELECTRIC DISCHARGES,...
An accuracy report of the Lightning Detection and Ranging System is presented. The effect of quantizing errors are modelled by use of a computer. The errors in the four configurations of the LDAR System are compared to the limiting errors in an ideal hyperbolic system. Performance data from the track of a jet plane and for the indicated position of a fixed lightning simulator are analyzed for dispersions in the data. Error models show the quality and the areas of highly accurate data, and show...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC ELECTRICITY, LIGHTNING, THUNDERSTORMS, ACCURACY,...
A class of infrared detectors is proposed and experimental results are presented for a prototype device. The material used is LaF3, an ionic conductor with a capacitance that varies exponentially with temperature. The detectivity of a prototype detector is estimated from measured signal voltages and incident power, and a Johnson noise voltage calculated from the measured resistance. For the parameters characterizing this device the estimated detectivity is consistent with a theoretical...
Topics: NASA Technical Reports Server (NTRS), EQUIPMENT SPECIFICATIONS, INFRARED DETECTORS, PROTOTYPES,...
The U.S. military doctrine adheres to a strategy of forward defense and flexible response. One basic premise of the U.S. global strategy is to defend the nation by fighting our foes on foreign soil. To accomplish this objective, the United States relies on its strategic mobility system to deploy and sustain military forces worldwide. To provide airlift and sealift assets to move large numbers of personnel, equipment, and support materiel from the continental United States (CONUS) to foreign...
Topics: DTIC Archive, Schank, John, RAND CORP SANTA MONICA CA, *MOBILITY, *LOGISTICS, *MILITARY PLANNING,...
The dielectric constant of a material is an extremely important parameter when considering passive radiometric remote sensing applications. This is because the emitted energy measured by a microwave radiometer is dependent on the dielectric constant of the surface being scanned. Two techniques of measuring dielectric constants are described. The first method involves a dielectric located in air. The second method uses basically the same theoretical approach, but the dielectric under...
Topics: NASA Technical Reports Server (NTRS), DIELECTRIC PROPERTIES, ELECTRICAL MEASUREMENT, REMOTE...
198
198
May 23, 2011
05/11
by
Guruswamy, G.; Tu, E
texts
eye 198
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Longitudinal dynamic stability derivatives required for design of aircraft are computed by using the state-of-the-art numerical methods for wing-body configurations. The flow is modeled using the Euler/Navier-Stokes equations with turbulence models and solved using an efficient finite-difference scheme suitable for patched structured grids. Computations are made at a flow regime that is beyond the limits of the current linear methods mostly used for computing stability derivatives. Flow...
Topics: ALUMINUM, COATINGS, ELECTRICAL MEASUREMENT, METAL FILMS, THIN FILMS, METAL STRIPS, ELECTRICAL...
Procedures for obtaining cell and array current-voltage measurements both outdoors in natural sunlight and indoors in simulated sunlight are presented. A description of the necessary apparatus and equipment is given for the calibration and use of reference solar cells. Some comments relating to concentration cell measurements, and a revised terrestrial solar spectrum for use in theoretical calculations, are included.
Topics: NASA Technical Reports Server (NTRS), ELECTRICAL MEASUREMENT, PHOTOVOLTAIC CELLS, SOLAR CELLS,...
Measurements, at low frequencies, of the shot noise current from space charge limited cathodes always produced results substantially in excess of theoretical predictions. Measuring the ratio (I sub eq)/S yielded a relation (I sub eq)/S = 1.288 V sub k = 1.288 k(T sub k)/e, independent of the operating point of the diode (triode) as long as all parts of the cathode had a full space charge controlled emission. This method was so sensitive as to permit detection of cathode temperature changes by 1...
Topics: NASA Technical Reports Server (NTRS), CATHODES, SHOT NOISE, DIODES, ELECTRICAL MEASUREMENT, LOW...
Open circuit emf measurements have been made to demonstrate that a two-phase, polycrystalline mixture of beta- alumina and alpha-alumina could be used as a solid electrolyte in galvanic cells with reversible electrodes fixing oxygen or aluminum chemical potentials. These measurements indicate that such a two phase solid electrolyte can be used to monitor oxygen chemical potentials as low as that corresponding to Al, Al2O3 coexistence. The activity of Na2O in beta-alumina in coexistence with...
Topics: NASA Technical Reports Server (NTRS), ALUMINUM OXIDES, ELECTROLYTIC CELLS, ELECTROMOTIVE FORCES,...
Raw data obtained from functional tests, data retention tests, and AC and DC parametric tests are presented along with schmoo plots. Rise/fall time screening results are included.
Topics: NASA Technical Reports Server (NTRS), ELECTRICAL MEASUREMENT, ELECTRONIC EQUIPMENT TESTS, RANDOM...
529
529
Jul 26, 2010
07/10
by
Long, W. C
texts
eye 529
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The results of the Independent Orbiter Assessment (IOA) of the Failure Modes and Effects Analysis (FMEA) and Critical Items List (CIL) are presented. The IOA effort first completed and analysis of the Communication and Tracking hardware, generating draft failure modes and potential critical items. The IOA results were then compared to the NASA FMEA/CIL baseline. A resolution of each discrepancy from the comparison is provided through additional analysis as required. This report documents the...
Topics: CATHODES, MECHANICAL PROPERTIES, SURVEYS, ELECTRIC BATTERIES, ELECTRICAL RESISTIVITY, LITHIUM,...
This report summarizes work done under Contract N00019-77-C-0372 for the Naval Air Systems Command. The basic objective has been to compare in-situ measurements of aerosol plumes with atmospheric electrical records in order to evaluate the potential of the latter. Initial efforts involved securing and installing an integrating nephelometer (Meteorology Research Inc. Model 1550B) in the Bellanca atmospheric research aircraft. The nephelometer is sensitive to aerosols in the 0.1 to 2 micrometers...
Topics: DTIC Archive, Markson,Ralph, AIRBORNE RESEARCH ASSOCIATES WESTON MA, *AEROSOLS, *PLUMES,...
Trig-Tek, Inc.'s Model 251A ACL-8 Anderson Current Loop (ACL) Conditioner is an eight channel device designed to condition variable-resistant sensor signals from Strain Gage and RTD's (Resistance Temperature Device)s. It uses NASA's patented ACL technology instead of the classic wheatstone bridge. The electronic measurement circuit delivers accuracy far beyond previous methods and prevents errors caused by variation in the wires that connect sensors to data collection equipment. This is the...
Topics: NASA Technical Reports Server (NTRS), TECHNOLOGY UTILIZATION, LOOPS, SIGNAL MEASUREMENT, ELECTRICAL...
The United States Naval Academy is an undergraduate school with a successful engineering program. An underlying philosophy in the Systems Engineering Department is to emphasize hands-on experience while maintaining a solid theoretical background. To realize this principle, both teachers and students face many challenges. In this paper an attempt is made to teach students how to build a very accurate ac voltage divider with an uncertainty better than a part-per-million. This implies building a...
Topics: DTIC Archive, NAVAL ACADEMY ANNAPOLIS MD DEPT OF WEAPONS AND SYSTEMS ENGINEERING, *VOLTAGE...
A test structure is described for enabling the accurate measurement of the resistance characteristics of a semiconductor material and includes one or more pairs of electrical terminals disposed on the surface of the material to enable measurements of the resistance encountered by currents passed between the terminals. A pair of terminals includes a first terminal extending in a closed path, such as a circle, around a second terminal, so that all currents flowing between the terminals flow along...
Topics: NASA Technical Reports Server (NTRS), ELECTRICAL MEASUREMENT, ELECTRICAL RESISTANCE, IMPEDANCE...
377
377
May 31, 2011
05/11
by
Kwadrat, Carl F.; Horne, William D.; Edwards, Bernard L
texts
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In order to avoid selecting inadequate inter-spacecraft cross-link communications standards for Distributed Spacecraft System (DSS) missions, it is first necessary to identify cross-link communications strategies and requirements common to a cross-section of proposed missions. This paper addresses the cross-link communication strategies and requirements derived from a survey of 39 DSS mission descriptions that are projected for potential launch within the next 20 years. The inter-spacecraft...
Topics: CAPACITORS, ELECTRIC BATTERIES, SPACECRAFT POWER SUPPLIES, ELECTRIC ENERGY STORAGE, COMPUTERIZED...
High voltage safety, fuels safety, simulation, and response/measurement techniques are discussed. Travelling wave transit times, return circuit conductor configurations, LC ladder network generators, and repetitive pulse techniques are also discussed. Differential conductive coaxial cable, analog fiber optic link, repetitive pulse sampled data instrumentation system, flash A/D optic link system, and an FM telemetry system are considered.
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT HAZARDS, FLIGHT HAZARDS, LIGHTNING, AIRCRAFT SAFETY,...
A constant current loop measuring system is provided for measuring a characteristic of an environment. The system comprises a first impedance positionable in the environment, a second impedance coupled in series with said first impedance and a parasitic impedance electrically coupled to the first and second impedances. A current generating device, electrically coupled in series with the first and second impedances, provides a constant current through the first and second impedances to produce...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC POTENTIAL, ELECTRICAL IMPEDANCE, ELECTRICAL...
Resistance of sample is measured with aid of usual electrical test instruments applied to electrical contacts provided at ram and anvil assemblies. Temperature differential is established between ram and anvil for measurement of Seebeck coefficient. Voltage generated across sample is detected at electrical contacts.
Topics: NASA Technical Reports Server (NTRS), ANVILS, ELECTRICAL MEASUREMENT, ELECTRICAL PROPERTIES,...
A capacitive transducer and circuit especially suited for making measurements in a high-temperature environment are described. The transducer includes two capacitive electrodes and a shield electrode. As the temperature of the transducer rises, the resistance of the insulation between the capacitive electrode decreases and a resistive current attempts to interfere with the capacitive current between the capacitive electrodes. The shield electrode and the circuit coupled there reduce the...
Topics: NASA Technical Reports Server (NTRS), CIRCUIT DIAGRAMS, ELECTRICAL MEASUREMENT, HIGH TEMPERATURE...
The electrical characterization and qualification test results are presented for the RCA MWS5001D random access memory. The tests included functional tests, AC and DC parametric tests, AC parametric worst-case pattern selection test, determination of worst-case transition for setup and hold times, and a series of schmoo plots. Statistical analysis data is supplied along with write pulse width, read cycle time, write cycle time, and chip enable time data.
Topics: NASA Technical Reports Server (NTRS), ELECTRICAL MEASUREMENT, ELECTRONIC EQUIPMENT TESTS, RANDOM...
282
282
May 23, 2011
05/11
by
NON
texts
eye 282
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An acoustic flame-out detection system is described that renders a large high pressure combustor safe in the event of a flame-out and possible explosive re-ignition. A dynamic pressure transducer is placed in the fuel line and detects the stabilizing fuel pressure oscillations caused by the combustion process. An electric circuit converts the signal from the combustion vortices, and transmitted to the fuel flow, to a series of pulses. A missing pulse detector counts the pulses and continuously...
Topics: ELECTRICAL PROPERTIES, ELECTROMAGNETISM, ELECTROMAGNETIC SCATTERING, THREE DIMENSIONAL MODELS, TWO...
Topics: DTIC Archive, Shenker, Henry, NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD, *TABLES(DATA),...
A bio-isolated dc operational amplifier is described for use in making bioelectrical measurements of a patient while providing isolation of the patient from electrical shocks. The circuit contains a first operational amplifier coupled to the patient with its output coupled in a forward loop through a first optic coupler to a second operational amplifier. The output of the second operational amplifier is coupled to suitable monitoring circuitry via a feedback circuit including a second optic...
Topics: NASA Technical Reports Server (NTRS), AMPLIFIER DESIGN, BIOENGINEERING, DIRECT CURRENT, ELECTRICAL...
Anders Precision Instrument Co.'s original meter could not measure dissipation leakage in capacitors. Seeking to add that capability, the company planned an advanced model. Before starting work, company president, Thomas Anderson, sought technical assistance from NASA's NERAC (New England Research Application Center). Anderson wanted a survey of the status and capabilities of NASA's electronic measuring devices. NERAC performed a search of six databases, including NASA's and provided a...
Topics: NASA Technical Reports Server (NTRS), CAPACITANCE, TECHNOLOGY UTILIZATION, CAPACITORS, ELECTRICAL...
The electrical characterization and qualification test results are presented for the RCA MWS 5001D random access memory. The tests included functional tests, AC and DC parametric tests, AC parametric worst-case pattern selection test, determination of worst-case transition for setup and hold times, and a series of schmoo plots. Average input high current, worst case input high current, output low current, and data setup time are some of the results presented.
Topics: NASA Technical Reports Server (NTRS), ELECTRICAL MEASUREMENT, ELECTRONIC EQUIPMENT TESTS, RANDOM...
An atmospheric electrical field experiment was conducted during Apollo 14 launch to measure the electrical perturbations produced by the space vehicle. The measurements showed the presence of a much stronger electrical field than was expected, and that the disturbance might be caused by a buildup of electrostatic charges in the launch vehicle engine exhaust clouds, charge buildup of the vehicle itself, or a combination of both. Efforts were also made to establish the origin and carriers of the...
Topics: NASA Technical Reports Server (NTRS), APOLLO 14 FLIGHT, ATMOSPHERIC ELECTRICITY, ELECTRICAL...
283
283
Aug 2, 2010
08/10
by
Ward, Donald T.; Shipley, Buford W., Jr
texts
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The Analytic Predictor Corrector (APC) and Energy Controller (EC) atmospheric guidance concepts were adapted to control an interplanetary vehicle aerobraking in the Martian atmosphere. Changes are made to the APC to improve its robustness to density variations. These changes include adaptation of a new exit phase algorithm, an adaptive transition velocity to initiate the exit phase, refinement of the reference dynamic pressure calculation and two improved density estimation techniques. The...
Topics: BIPOLAR TRANSISTORS, FIELD EFFECT TRANSISTORS, METAL OXIDE SEMICONDUCTORS, SILICON, SWITCHING...
This report presents a detailed method for the measurement of collector-emitter saturation voltage. The method which is included in the Appendix is proposed for standardization. The report also contains a description of the laboratory confirmation of the method and a discussion of the precautions to be taken to assure repeatability of the measurement. Emphasized is the necessity to determine that the conditions for saturation are met during the measurement. (Author)
Topics: DTIC Archive, Leedy,Kathryn, NATIONAL BUREAU OF STANDARDS WASHINGTON D C ELECTRONIC TECHNOLOGY DIV,...
An improved mathematical model has been developed of the time dependence of buildup or decay of electric charge in a high-resistivity (nominally insulating) material. The model is intended primarily for use in extracting the DC electrical resistivity of such a material from voltage -vs.- current measurements performed repeatedly on a sample of the material over a time comparable to the longest characteristic times (typically of the order of months) that govern the evolution of relevant...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC CHARGE, ELECTRICAL RESISTIVITY, MATHEMATICAL MODELS,...
