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  • 1
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    Procedures for analysis of spatial relationships among ship survey data and sea surface temperature (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The establishment of a limited spatial data base for the U.S. eastern seaboard vicinity is discussed along with the demonstration of computer assisted analysis techniques for investigating spatial patterns and relationships among ship survey data and remotely sensed sea surface temperature. Ship survey variables included concentrations of two zooplankton, two icthyoplankton, and two fish species, in addition to physical data of depth to bottom and surface and bottom water temperatures. Continuous spatial distributions of these data were created by both weighted nearest neighbor and iterative smoothing interpolation techniques. Maps of surface water temperature were created by digitizing GOES satellite images. All mapped data were spatially registered by conversion of latitude and longitude coordinates to rotated Lambert conic conformal rectilinear coordinates and stored in grid format of approximately one hundred square kilometers per cell. The analysis of these data include the generation of statistical summaries and maps describing the joint occurrence among variables.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center 2d Eastern Reg. Remote Sensing Appl. Conf.; p 353-365
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  • 2
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    Fundamental procedures of geographic information analysis (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Analytical procedures common to most computer-oriented geographic information systems are composed of fundamental map processing operations. A conceptual framework for such procedures is developed and basic operations common to a broad range of applications are described. Among the major classes of primitive operations identified are those associated with: reclassifying map categories as a function of the initial classification, the shape, the position, or the size of the spatial configuration associated with each category; overlaying maps on a point-by-point, a category-wide, or a map-wide basis; measuring distance; establishing visual or optimal path connectivity; and characterizing cartographic neighborhoods based on the thematic or spatial attributes of the data values within each neighborhood. By organizing such operations in a coherent manner, the basis for a generalized cartographic modeling structure can be developed which accommodates a variety of needs in a common, flexible and intuitive manner. The use of each is limited only by the general thematic and spatial nature of the data to which it is applied.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center 2d Eastern Reg. Remote Sensing Appl. Conf.; p 269-281
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  • 3
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    Extending the utility of forest cover maps (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A computer-assisted map analysis system is discussed that characterizes timber supply in terms of standing timber; accessibility considering various harvesting factors; and availability as affected by ownership patterns of timberlands. Factors affecting harvesting include proximity to existing roads and consideration of terrain characteristics. Availability considerations include size of ownership, housing density and excluded areas. The model is demonstrated for a seventy square mile tract in western Massachusetts.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center 2nd Eastern Reg. Remote Sensing Appl. Conf.; p 89-99
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  • 4
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    Flying qualities - A costly lapse in flight-control design (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Generic problems in advanced aircraft with advanced control systems which suffer from control sensitivity, sluggish response, and pilot-induced oscillation tendencies are examined, with a view to improving techniques for eliminating the problems in the design phase. Results of two NASA and NASA/AIAA workshops reached a consensus that flying qualities criteria do not match control system development, control system designers are not relying on past experience in their field, ground-based simulation is relied on too heavily, and communications between flying qualities and control systems engineers need improvement. A summation is offered in that hardware and software have outstripped the pilot's capacity to use the capabilities which new aircraft offer. The flying qualities data base is stressed to be dynamic, and continually redefining the man/machine relationships.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: Astronautics and Aeronautics; 20; Apr. 198
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  • 5
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    Measurements of Pilot Time Delay as Influenced by Controller Characteristics and Vehicles Time Delays (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A study to measure and compare pilot time delay when using a space shuttle rotational hand controller and a more conventional control stick was conducted at NASA Ames Research Center's Dryden Flight Research Facility. The space shuttle controller has a palm pivot in the pitch axis. The more conventional controller used was a general-purpose engineering simulator stick that has a pivot length between that of a typical aircraft center stick and a sidestick. Measurements of the pilot's effective time delay were obtained through a first-order, closed-loop, compensatory tracking task in pitch. The tasks were implemented through a space shuttle cockpit simulator and a critical task tester device. The study consisted of 450 data runs with four test pilots and one nonpilot, and used three control stick configurations and two system delays. Results showed that the heavier conventional stick had the lowest pilot effective time delays associated with it, whereas the shuttle and light conventional sticks each had similar higher pilot time delay characteristics. It was also determined that each control stick showed an increase in pilot time delay when the total system delay was increased.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: 20th Ann. Conf. on Manual Control, Vol. 1; p 210-221
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  • 6
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    Fitness variables and the lipid profile in United States astronauts (1980)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The study examines the relationship between several measures of fitness and the lipid profile in United States astronauts. Data were collected on 89 astronauts, previously selected (PSA) and newly selected (NSA), during their annual physical examinations. Several similarities were seen in the two groups. The PSA (mean age of 46.1) had a lower maximum oxygen capacity (41.7 ml kg/min vs. 47.5 ml kg/min); when adjusted for age, it was no different from the NSA (mean age 33.5). The PSA had similar body composition with 15.7% - lower than expected for age. The lipid profiles of the two groups were basically the same with the differences being a function of age. Compared to a normative population, the astronauts had similar cholesterols, lower triglycerides, and higher HDLs. The astronaut profiles were generally more favorable than the age-matched controls, which is felt to be a result of the self-supervised conditioning program and annual preventive medicine consultation and education.
    Keywords: AEROSPACE MEDICINE
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  • 7
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    Super-Schottky mixer performance at 92 GHz (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: As part of a program to investigate the behavior of superconducting Schottky mixers at high frequencies, the mixing and video performance of several super-Schottky diodes (a 3-micron active diameter, and a doping concentration of 2 x 10 to the 19th per cu cm) have been tested at 92 GHz. At 92 GHz, video responsivities were typically 80 A/W (corrected for RF mismatch). Conversion loss (corrected for both RF and IF mismatches) was typically not less than 18 dB. As expected, diode temperature was low (less than 5 K). Video responsivity and conversion loss were also measured at an RF frequency of 3.95 GHz. These data were used with the measured volt-ampere characteristics of the diodes to compare theoretical predictions of diode performance at 92 GHz, in both the video and mixing modes, with the high-frequency data
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEEE Transactions on Microwave Theory and Techniques; MTT-29; Aug. 198
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  • 8
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    Thermoregulatory responses of rats to varying environmental temperatures (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The peripheral (tail) circulatory responses of six male albino rats were measured at ambient temperatures between 5 and 40 C, using impedance plethysmography. Each animal was anesthetized, instrumented, and placed in a thermal environmental chamber to reach equilibrium. Tail blood flow, respiration rate, heart rate, core temperature, and tail skin temperature were then monitored at each ambient temperature. The mean tail blood flow was significantly higher (p less than 0.05) at 5 C than at 10 C. The mean blood flow increased significantly (p less than 0.01) at each of the temperatures above 10 C. Tail skin temperature and internal body (core) temperature increased significantly with increasing ambient temperature.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Aviation, Space, and Environmental Medicine (ISSN 0095-0562); 55; 546-549
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  • 9
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    Animal experimentation in Spacelab - Present and future U.S. plans (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Current development of life-sciences hardware and experiments for the fourth Spacelab mission in the Life Sciences Flight Experiments Program at NASA Ames is reviewed. The research-animal holding facility, the general-purpose work station, and the life sciences laboratory equipment are characterized, and the 14 Ames projects accepted for the mission are listed and discussed. Several hardware systems and experimental procedures will be verified on the Spacelab-3 mission scheduled for late 1984.
    Keywords: LIFE SCIENCES (GENERAL)
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  • 10
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    Software errors and complexity: An empirical investigation (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The distributions and relationships derived from the change data collected during the development of a medium scale satellite software project show that meaningful results can be obtained which allow an insight into software traits and the environment in which it is developed. Modified and new modules were shown to behave similarly. An abstract classification scheme for errors which allows a better understanding of the overall traits of a software project is also shown. Finally, various size and complexity metrics are examined with respect to errors detected within the software yielding some interesting results.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: TR-1195 , NASA Goddard Space Flight Center Collected Software Engineering Papers, Volume 2; 24 p
    Format: application/pdf
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