481
481
Jun 18, 2010
06/10
by
Feoktistov, K. P.; Rozenberg, G.; Sandomirskiy, A. B.; Sergeyevich, V. N.; Sonechkin, D. M
texts
eye 481
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Results of visual and photographic observations by crew of Voskhod manned spacecraft
Topics: PHOTOGRAPHIC RECORDING, U.S.S.R. SPACE PROGRAM, VISUAL OBSERVATION, VOSKHOD MANNED SPACECRAFT,...
375
375
Jul 11, 2010
07/10
by
Fusaro, R. L
texts
eye 375
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comment 0
A study was conducted on the lubricating properties of organopolysiloxane-bonded graphite fluoride (CF sub 1.1) sub n films. The effects of temperature, atmosphere, composition of organopolysiloxane, and burnishing additional (CF sub 1.1) sub n powder onto the film surface were studied. For comparison, similar experiments were conducted on organopolysiloxane-bonded MoS2 films. The results are equivalent for both films, except that in a moist air environment the wear lives of the films...
Topics: DEFECTS, FAILURE, MICROELECTRONICS, VISUAL OBSERVATION, INTEGRATED CIRCUITS, MANUFACTURING, QUALITY...
360
360
Jul 5, 2010
07/10
by
RAUCH, J
texts
eye 360
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THE ACOUSTIC PRINCIPLES ARE PRESENTED FOR ATTENUATING AUTOMOBILE ENGINE NOISE. THE VARIOUS ASPECTS OF SOUNDPROOFING EXHAUST NOISE ARE DISCUSSED, ALONG WITH THE MEANS FOR LOW PITCH SOUND ABSORPTION. A TERMINAL REFLECTION MUFFLER SYSTEM FOR TOTAL NOISE SUPPRESSION IS DESCRIBED. AN ADMITTANCE TYPE MUFFLER IS ALSO CONSIDERED, AND THE REQUISITE DYNAMIC AND ACOUSTIC CONDITIONS FOR ITS USE ARE DETERMINED. DIFFERENT MATERIALS ARE PROPOSED FOR USE AS SOUND ABSORBERS AND THE CASE OF ACOUSTIC...
Topics: CLOUDS (METEOROLOGY), MESOSPHERE, NOCTILUCENT CLOUDS, GROUND STATIONS, SPACE MISSIONS, VISUAL...
248
248
Jul 11, 2010
07/10
by
ZEIGLER, K.; LEHMKUHL, H.; GRIMME, W
texts
eye 248
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A HIGH CONDUCTIVITY ORGANOMETALLIC ELECTROLYTE WAS INVESTIGATED FOR THE CATHODIC DEPOSITION OF NA. IT CONSISTS OF A MIXTURE OF NAALME 4 (30 - 75 MOLE %) AND CORRESPONDING ALKOXY-COMPLEX COMPOUND.
Topics: DISPLACEMENT, HUMAN PERFORMANCE, MOTION PERCEPTION, EYE (ANATOMY), MEASURING INSTRUMENTS, VISUAL...
182
182
Jun 21, 2010
06/10
by
Zverev, I. N
texts
eye 182
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Propagation of perturbations in viscoelastic and viscoplastic rod
Topics: NOCTILUCENT CLOUDS, SATELLITE OBSERVATION, VISUAL OBSERVATION, BRIGHTNESS, CONTRAST, EARTH SURFACE,...
It is possible that asbestos-containing materials (ACMs) are contained in construction and demolition waste (CDW) that is transported to an intermediate treatment facility. Therefore, a rapid method of detecting asbestos fibers at an intermediate treatment facility for CDW is required. Although a visual observation method has been developed for rapid determination, the time required to determine should be shortened further. If asbestos fibers on a certain part of the surface of CDW particles...
Topics: Asbestos, Fiber Bundle, Construction and Demolition Waste, Visual Observation, Sorting, Error Rate
1,766
1.8K
Jun 21, 2010
06/10
by
Yakovlev, A. S
texts
eye 1,766
favorite 4
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History of USSR aviation industry, aircraft design, and air transportation
Topics: ARTIFICIAL SATELLITES, ATMOSPHERIC DENSITY, VISUAL OBSERVATION, GRAPHS (CHARTS), SYNCHRONISM,...
221
221
Jun 9, 2011
06/11
by
Rodriguez, C. G.; White, J. A.; Riggins, D. W
texts
eye 221
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A numerical investigation of an experimental dual-mode scramjet configuration is performed. Both experimental and numerical results indicate significant upstream interaction for this case. Several computational cases are examined: these include the use of jet-to-jet symmetry and entire half-duct modeling. Grid convergence, turbulence modeling, and wall temperature effects are studied in terms of wall pressure predictions and flow-field characteristics. Wall pressure comparisons between CFD and...
Topics: CLOUDS (METEOROLOGY), GROUND TRUTH, SATELLITE INSTRUMENTS, STUDENTS, VISUAL OBSERVATION, EDUCATION,...
274
274
Jun 13, 2011
06/11
by
Hood, Robbie E.; Zipser, Edward; Heymsfield, Gerald M.; Kakar, Ramesh; Halverson Jeffery; Rogers, Robert; Black, Michae
texts
eye 274
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The Tropical Cloud Systems and Processes experiment is sponsored by the National Aeronautics and Space Administration (NASA) to investigate characteristics of tropical cyclone genesis, rapid intensification and rainfall using a three-pronged approach that emphasizes satellite information, suborbital observations and numerical model simulations. Research goals include demonstration and assessment of new technology, improvements to numerical model parameterizations, and advancements in data...
Topics: LOCOMOTION, TRAJECTORIES, VISUAL PERCEPTION, POSTURE, VISUAL OBSERVATION, VISION, VISUAL SIGNALS,...
246
246
Jun 27, 2010
06/10
by
Royer, H., et al
texts
eye 246
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Imaging and analysis method for very weak phase objects which gives exact measure of optical path gradients
Topics: LIBRATIONAL MOTION, LUNAR CRATERS, MOON, ROTATION, CELESTIAL MECHANICS, LIBRATION, MATHEMATICAL...
737
737
Jul 21, 2010
07/10
by
NON
texts
eye 737
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comment 0
Support decisions concerning the provision by the Federal Government of third-party liability insurance for commercial space activities were studied. The practices associated with third-party liability insurance in the marine, aviation, and electric utility industries in addition to those industries associated with space missions were reviewed. Theoretical considerations of rate setting are discussed and a methodology to determine the period of time over which the insurers of each industry...
Topics: AURIGA CONSTELLATION, ECLIPSING BINARY STARS, SPECTROPHOTOMETRY, BROADBAND, ECHELETTE GRATINGS,...
179
179
Jul 11, 2010
07/10
by
Fireman, E. L
texts
eye 179
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A statistical model is given for soil development relating meteoroid impacts on the moon to cosmic-ray-produced isotopes in the soil. By means of this model, the average lunar mass loss rate during the past 1.4 aeons is determined to be 170g/sq cm aeon and the soil mixing rate to be approximately 200 cm/aeon from the gadolinium isotope data for the Apollo 15 and 16 drill stems. The isotope data also restrict the time variation of the meteoroid flux during the past 1.4 aeons.
Topics: CLOUD PHOTOGRAPHY, EARTH SURFACE, SPACEBORNE PHOTOGRAPHY, VISUAL OBSERVATION, ASTRONAUTS, CLOUDS...
355
355
Jul 23, 2010
07/10
by
Robinson, J. W
texts
eye 355
favorite 0
comment 0
No Abstract Available
Topics: APOLLO PROJECT, CELESTIAL NAVIGATION, EARTH LIMB, SEXTANTS, SPACECRAFT GUIDANCE, ANGLES (GEOMETRY),...
455
455
Jun 9, 2011
06/11
by
Hartung, Lin C.; Mitcheltree, Robert A.; Gnoffo, Peter A
texts
eye 455
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Lunar and Mars return conditions are examined using the LAURA flow field code and the LORAN radiation code to assess the effect of radiative coupling on axisymmetric thermochemical nonequilibrium flows. Coupling of the two codes is achieved iteratively. Special treatment required to couple radiation in a shock-capturing method is discussed. Results indicate that while coupling effects are generally the same as occur in equilibrium flows, under certain conditions radiation can modify the...
Topics: AQUATIC PLANTS, STRESS (PHYSIOLOGY), ETHYLENE COMPOUNDS, GLYCOLS, VISUAL OBSERVATION, ENVIRONMENT...
324
324
May 31, 2011
05/11
by
Ku, Jentung; Birur, Ga
texts
eye 324
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The operating temperature of a loop heat pipe (LHP) with multiple evaporators is a function of the total heat load, heat load distribution among evaporators, condenser temperature and ambient temperature. Because of the many variables involved, the operating temperature also showed more hystereses than an LHP with a single evaporator. Tight temperature control can be achieved by controlling its compensation chamber (CC) temperatures at the desired set point. This paper describes a test program...
Topics: VISUAL OBSERVATION, LEONID METEOROIDS, DUST STORMS, MATHEMATICAL MODELS, LORENTZ TRANSFORMATIONS,...
The triangulation method developed specifically for the Barium Ion Cloud Project is discussed. Expression for the four displacement errors, the three slope errors, and the curvature error in the triangulation solution due to a probable error in the lines-of-sight from the observation stations to points on the cloud are derived. The triangulation method is then used to determine the effect of the following on these different errors in the solution: the number and location of the stations, the...
Topics: NASA Technical Reports Server (NTRS), ERROR ANALYSIS, TRIANGULATION, BARIUM, VISUAL OBSERVATION,...
Screening procedures for the final precap visual inspection of microcircuits used in electronic system components are described as an aid in training personnel unfamiliar with microcircuits. Processing techniques used in industry for the manufacture of monolithic and hybrid components are presented and imperfections that may be encountered during this inspection are discussed. Problem areas such as scratches, voids, adhesions, and wire bonding are illustrated by photomicrographs. This guide can...
Topics: NASA Technical Reports Server (NTRS), CIRCUIT RELIABILITY, COMPONENT RELIABILITY, INSPECTION,...
237
237
Jul 12, 2010
07/10
by
Howard, B. T.; Orrok, G. T
texts
eye 237
favorite 0
comment 0
No Abstract Available
Topics: APOLLO 12 FLIGHT, VELOCITY, APOLLO 13 FLIGHT, CLOUD GLACIATION, VISUAL OBSERVATION, WATER, ERRORS,...
398
398
Jun 9, 2011
06/11
by
Bhasin, Kul; Hayden, Jeffre
texts
eye 398
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comment 0
Space communications architecture concepts play a key role in the development and deployment of NASA's future exploration and science missions. Once a mission is deployed, the communication link to the user needs to provide maximum information delivery and flexibility to handle the expected large and complex data sets and to enable direct interaction with the spacecraft and experiments. In human and robotic missions, communication systems need to offer maximum reliability with robust two-way...
Topics: RADIANT FLUX DENSITY, ON-LINE SYSTEMS, STUDENTS, RAIN FORESTS, EDUCATION, VISUAL OBSERVATION, TRMM...
The amplitude of nystagmus multiplied by its frequency gives a value commensurate to the velocity of slow phase. If the amplitude and the frequency during the visual observation are expressed in relative units (e.g., in points ranging from 1 to 3) the results of multiplication are used for a relative evaluation of nystagmus intensity. The relative evaluation of nystagmus intensity is used to compare the responses and, in particular, to calculate the coefficients of labyrinth asymmetry and of...
Topics: NASA Technical Reports Server (NTRS), LABYRINTH, NYSTAGMUS, VESTIBULAR NYSTAGMUS, VISUAL...
The results of an evaluation of police helicopter effectiveness revealed a need for improved visual capability. A JPL program developed a method that would enhance visual observation capability for both day and night usage and demonstrated the feasibility of the adopted approach. This approach made use of remote pointable optics, a display screen, a slaved covert searchlight, and a coupled camera. The approach was proved feasible through field testing and by judgement against evaluation...
Topics: NASA Technical Reports Server (NTRS), HELICOPTERS, POLICE, VISUAL FIELDS, DISPLAY DEVICES, OPTICS,...
A dissertation is given on the final preseal visual inspection of microcircuit devices to detect manufacturing defects and reduce failure rates in service. The processes employed in fabricating monolithic integrated circuits and hybrid microcircuits, various failure mechanisms resulting from deficiencies in those processes, and the rudiments of performing final inspection are outlined.
Topics: NASA Technical Reports Server (NTRS), DEFECTS, FAILURE, MICROELECTRONICS, VISUAL OBSERVATION,...
385
385
Jun 20, 2010
06/10
by
Froelich, F. W
texts
eye 385
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Correlation between sensation time and reaction time based on physiological tests patterned on astronomic observations of star transients
Topics: ASTRONOMY, STARS, REACTION TIME, SENSORY PERCEPTION, SENSORY STIMULATION, VISUAL OBSERVATION,...
Topics discussed include: a) Investigation of MMOD Impact on STS-115 Shuttle Payload Bay Door; b) Optical Observations of GEO Debris with Two Telescopes; and c) Optical Measurement Center Status.
Topics: NASA Technical Reports Server (NTRS), SPACE DEBRIS, TELESCOPES, SPACE SHUTTLE PAYLOADS, OPTICAL...
The dynamics are investigated of the lower thermosphere through comparison of optical observations of motions of ejected vapor trails with radar observations of motions of ionized meteor trails. In particular, the winds obtained from a series of vapor trail observations which occurred at Wallops Island, Virginia during the night of 14-15 December 1970 are to be compared with wind data deduced from radar observations of meteor trails during the same period. The comparison of these data is...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC CIRCULATION, CONTRAILS, METEOR TRAILS, VISUAL...
276
276
May 23, 2011
05/11
by
Steenken, William G.; Williams, John G.; Yuhas, Andrew J.; Walsh, Kevin R
texts
eye 276
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The F404-GE-400-powered F/A-18A High Alpha Research Vehicle (HARV) was used to examine the quality of inlet airflow during departed flight maneuvers, that is, during flight outside the normal maneuvering envelope where control surfaces have little or no effectiveness. Six nose-left and six nose-right departures were initiated at Mach numbers between 0.3 and 0.4 at an altitude of 35 kft. The entry yaw rates were approximately 40 to 90 deg/sec. Engine surges were encountered during three of the...
Topics: SCALARS, TWO DIMENSIONAL MODELS, VISUAL OBSERVATION, THREE DIMENSIONAL MODELS, COMPUTER PROGRAMS,...
256
256
Jun 13, 2011
06/11
by
Forth, S. C.; Johnston, W. M.; Seshadri, B. R
texts
eye 256
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comment 0
Over the past thirty years, laboratory experiments have been devised to develop fatigue crack growth rate data that is representative of the material response. The crack growth rate data generated in the laboratory is then used to predict the safe operating envelope of a structure. The ability to interrelate laboratory data and structural response is called similitude. In essence, a nondimensional term, called the stress intensity factor, was developed that includes the applied stresses, crack...
Topics: EYE (ANATOMY), PROPRIOCEPTION, PSYCHOMOTOR PERFORMANCE, EYE MOVEMENTS, VISUAL TASKS, VISUAL...
201
201
Jun 1, 2011
06/11
by
Litchford, Ron; Cole, John; Rodgers, Steve; Sackheim, Bo
texts
eye 201
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This viewgraph presentation provides information on spacecraft propulsion research. The organizational and management principals needed for the research are stated. The presentation recommends a space propulsion research program. It also states some of the factors which drive research in the field, as well as the desired goals, objectives, and focus of the research.
Topics: ANTARCTIC REGIONS, SATELLITE ALTIMETRY, SATELLITE OBSERVATION, SNOW, CLIMATOLOGY, OPTICAL...
Visual data on formation and motion of lift-induced wingtip vortex were obtained by stationary, airflow visualization method. Visual data indicated that vortex cannot be eliminated by merely reshaping wingtip. Configuration change will likely have only small effect on far-field flow.
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT DESIGN, ATTENUATORS, FLIGHT TESTS, SPLINES, VISUAL...
A system for automatically inspecting an integrated circuit was developed. A device for shining a scanning narrow light beam at an integrated circuit to be inspected and another light beam at an accepted integrated circuit was included. A pair of photodetectors that receive light reflected from these integrated circuits, and a comparing system compares the outputs of the photodetectors.
Topics: NASA Technical Reports Server (NTRS), AUTOMATIC CONTROL, INSPECTION, MICROELECTRONICS, VISUAL...
Details are presented of an investigation aimed at an explanation of the phenomenon of light flashes observed by Apollo crew members. The various theories considered include: penetration of the eye by cosmic particles resulting in retinal stimulation; production of phosphenes or sensations of light through ionization or excitation; appearance of heavily ionized single tracks misinterpreted as light flashes; Cerenkov radiation; and direct excitation of neural tissue by penetrating cosmic rays....
Topics: NASA Technical Reports Server (NTRS), APOLLO PROJECT, COSMIC RAYS, LIGHT (VISIBLE RADIATION),...
Sides of spatial filter slits are shaped so that their contribution to signal is reduced, thus minimizing the number of scanning errors.
Topics: NASA Technical Reports Server (NTRS), ALIGNMENT, DEFECTS, INTEGRATED CIRCUITS, OPTICAL FILTERS,...
The application of radar and visual techniques to determine the migratory habits of passerine birds during daylight and darkness is discussed. The effects of wind on the direction of migration are examined. Scatter diagrams of daytime and nocturnal migration track directions correlated with wind direction are presented. It is concluded that migratory birds will fly at altitudes where wind direction and migratory direction are nearly the same. The effects of cloud cover and solar obscuration are...
Topics: NASA Technical Reports Server (NTRS), BIRDS, MIGRATION, NAVIGATION, RADAR TRACKING, VISUAL...
The International Halley Watch is described as well as comets and observing techniques. Information on periodic Comet Halley's apparition for its 1986 perihelion passage is provided. Instructions are given for observation projects valuable to the International Halley Watch in six areas of study: (1) visual observations; (2) photography; (3) astrometry; (4) spectroscopic observations; (5) photoelectric photometry; and (6) meteor observations.
Topics: NASA Technical Reports Server (NTRS), ASTRONOMY, HALLEY'S COMET, METEOROIDS, ASTROMETRY,...
Each space shuttle orbiter has 38 Primary Reaction Control System (PRCS) thrusters to help power and position the vehicle for maneuvers in space, including reentry and establishing Earth orbit. Minor flaws in the ceramic lining of a thruster, such as a chip or crack, can cripple the operations of an orbiter in space and jeopardize a mission. The ability to locate, measure, and monitor tiny features in difficult-to-inspect PRCS thrusters improves their overall safety and lifespan. These...
Topics: NASA Technical Reports Server (NTRS), LASERS, MAPPING, SPACE SHUTTLE ORBITERS, THRUSTORS, EARTH...
Mkn 110 is a bright, nearby Seyfert 1 galaxy, which underwent a long optical monitoring campaign, during the past 12 years. Optical observations show that Mkn 110 vary, both in flux and spectral shape. The intensity and width of its Broad Emission Lines (BELs) also vary, from typical Seyfert 1, to typical Narrow Line Seyfert 1 (NLSyl) values, so suggesting that this could be the first supermassive black holes where accretion state related transitions, as frequently observed in stellar-size...
Topics: NASA Technical Reports Server (NTRS), SEYFERT GALAXIES, VISUAL OBSERVATION, X RAY SPECTRA, EMISSION...
The objective is to develop methods to detect and monitor levee slides using commercially available high resolution multispectral imagery. High resolution multispectral imagery like IKONOS and QuickBird are suitable for detecting and monitoring levee slides. IKONOS is suitable for visual inspection, image classification and Tasseled Cap transform based slide detection. Tasseled Cap based model was found to be the best method for slide detection. QuickBird was suitable for visual inspection and...
Topics: NASA Technical Reports Server (NTRS), IMAGE CLASSIFICATION, VISUAL OBSERVATION, INSPECTION, HIGH...
A method of using an interactive graphics device to generate a large portion of the input bulk data with visual checks of the structure and the card images is described. The generation starts from GRID and PBAR cards. The visual checks result from a three-dimensional display of the model in any rotated position. By detailing the steps, the time saving and cost effectiveness of this method may be judged, and its potential as a useful tool for the structural analyst may be established.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, DATA MANAGEMENT, COMPUTER GRAPHICS, COST...
524
524
Jul 21, 2010
07/10
by
Luers, J. K.; Fiscus, I. B
texts
eye 524
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Experimental tests were conducted in the UDRI Environmental Wind/Rain Tunnel to establish the performance of an alpha-vane, that measures angle of attack, in a simulated heavy rain environment. The tests consisted of emersing the alpha-vane in an airstream with a concurrent water spray penetrating vertically through the airstream. The direction of the spray was varied to make an angle of 5.8 to 18 deg with the airstream direction in order to simulate the conditions that occur when an aircraft...
Topics: ASTRONOMICAL SPECTROSCOPY, LIGHT CURVE, SPECTROGRAMS, WAVELENGTHS, AURIGA CONSTELLATION, ECLIPSING...
Observations of lunar transient phenomena for the Association of Lunar and Planetary Observers (ALPO) are reported. The procedures for making visual observations for estimating albedo are described, and the reported albedo analyzed for lunar topographic features. It is shown that a catalog or scale of albedos can be established for each feature.
Topics: NASA Technical Reports Server (NTRS), ALBEDO, LUNAR TOPOGRAPHY, VISUAL OBSERVATION, LUNAR...
267
267
May 23, 2011
05/11
by
Cook, Stephen A
texts
eye 267
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The goal of the Reusable Launch Vehicle (RLV) technology program is formulated, and the primary objectives of RLV are listed. RLV technology program implementation phases are outlined. X-33 advanced technology demonstrator is described. Program management is addressed.
Topics: HUBBLE SPACE TELESCOPE, BROWN DWARF STARS, COMPANION STARS, STELLAR COLOR, STELLAR MASS, MASS TO...
NASA s Chandra X-ray Observatory and ESA s XMM-Newton made their first observations over a decade ago. The unprecedented and complementary capabilities of these observatories to detect, image, and measure the energy of cosmic X-rays, achieved less than 50 years after the first detection of an extra-solar X-ray source, represent an increase in sensitivity comparable in going from naked-eye observations to the most powerful optical telescopes over the past 400 years. In this presentation we...
Topics: NASA Technical Reports Server (NTRS), X RAY ASTROPHYSICS FACILITY, ASTROPHYSICS, X RAY SOURCES,...
230
230
May 21, 2011
05/11
by
Zhuang, W.; Chouinard, J.-Y.; Yongacoglu, A
texts
eye 230
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Land mobile satellite communications at Ka-band (30/20 GHz) are attracting an increasing interest among researchers because of the frequency band availability and the possibility of small earth station designs. However, communications at the Ka-band pose significant challenges in the system designs due to severe channel impairments. Because only very limited experimental data for mobile applications at Ka-band is available, this paper studies the channel characteristics based on experimental...
Topics: GALAXIES, TORQUE, VISUAL OBSERVATION, X RAYS, GINGA SATELLITE, MASS TRANSFER, PULSARS, STELLAR...
We studied galaxy clusters Abell 119, Abell 754, and Abell 1750, using data from the ASCA and ROSAT satellites. In addition, we completed the paper "Merging Binary Clusters". In this paper we study three prominent bi-modal X-ray clusters: A3528, A1750 and A3395. Since the sub-clusters in these systems have projected separations of 0.93, 1.00 and 0.67 Mpc respectively, we examine their X-ray and optical observations to investigate the dynamics and possible merging of these...
Topics: NASA Technical Reports Server (NTRS), GALACTIC STRUCTURE, GALACTIC CLUSTERS, BRIGHTNESS...
The International Halley Watch (IHW) was organized for the purpose of gathering and archiving the most complete record of the apparition of a comet, Comet Halley (1982i = 1986 III = 1P/Halley), ever compiled. The redirection of the International Cometary Explorer (ICE), toward Comet Giacobini-Zinner (1984e = 1985 XIII = 21P/Giacobini-Zinner) prompted the initiation of a formal watch on that comet. All the data collected on P/Giacobini-Zinner and P/Halley have been published on CD-ROM in the...
Topics: NASA Technical Reports Server (NTRS), GIACOBINI-ZINNER COMET, CASE HISTORIES, SPACE OBSERVATIONS...
Even on a bad day, looking down from orbit is a powerful and enjoyable experience, enhanced by the knowledge that time in orbit represents only a tiny fraction of one's life. You look down at Earth and you feel a sense of peace and solidarity. You look at the stars, and because they are not obscured by atmosphere, they are far more abundant than you realized, and they shine very bright. Later on you will reflect on this as one of life's greatest moments. Today astronauts and a few wealthy space...
Topics: NASA Technical Reports Server (NTRS), ASTRONAUTS, SPACE EXPLORATION, VISUAL OBSERVATION,...
Battery cell defect classification is primarily done manually by a human conducting a visual inspection to determine if the battery cell is acceptable for a particular use or device. Human visual inspection is a time consuming task when compared to an inspection process conducted by a machine vision system. Human inspection is also subject to human error and fatigue over time. We present a machine vision technique that can be used to automatically identify defective sections of battery cells...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC BATTERIES, CELL CATHODES, CLASSIFICATIONS, CELL...
Investigation of potential tornado-producing thunderstorms was performed during part of the 1972 and 1973 tornado seasons. On May 7, 1973 twenty-one tornadoes were confirmed over southern Missouri, northern Arkansas, and southwestern Illinois. The region was surveyed by high altitude photography performed on a Learjet over the region of reported tornadoes. Two storms were chosen from aircraft observation with the guidance of ground and radar reports, and a series of photographs were taken of a...
Topics: NASA Technical Reports Server (NTRS), METEOROLOGICAL PARAMETERS, RADAR TRACKING, THUNDERSTORMS,...
The 1998 Leonids Meteor Shower was videoed by NASA Johnson Space Center (JSC) personnel at Houston, Texas, and Cloudcroft, New Mexico. The videos were screened and the Leonids Meteors in the videos were analyzed. The outcome of this effort was tables of counts per hour over the viewing period and a comparison to the Leonids Meteors Mass Distribution model used for risk assessment calculations associated with space shuttle missions. The comparison exhibited a difference between the observed data...
Topics: NASA Technical Reports Server (NTRS), VISUAL OBSERVATION, METEOROID SHOWERS, MASS DISTRIBUTION,...
Visual meteor observations are carried out on a regular basis by many experienced observers worldwide, thus supplying information about activity of meteor showers. The limits of the method are determined by the accuracy of the detection of the meteor trail. This study shows that visual meteor observations provide reliable data for an observable hourly rate of greater than or equal to 3.
Topics: NASA Technical Reports Server (NTRS), METEOROID SHOWERS, SPACE OBSERVATIONS (FROM EARTH), VISUAL...
