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  • Weitere Quellen  (738)
  • EARTH RESOURCES AND REMOTE SENSING  (486)
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  • 1970-1974  (738)
  • 1974  (738)
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  • 1990-1994
  • 1970-1974  (738)
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  • 1
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    Image data processing of earth resources management (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-05-07
    Beschreibung: Various image processing and information extraction systems are described along with the design and operation of an interactive multispectral information system, IMAGE 100. Analyses of ERTS data, using IMAGE 100, over a number of U.S. sites are presented. The following analyses are included: investigations of crop inventory and management using remote sensing; and (2) land cover classification for environmental impact assessments. Results show that useful information is provided by IMAGE 100 analyses of ERTS data in digital form.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Chamber of Commerce Proc. of the 1st 1974 Technol. Transfer Conf.; p 201-218
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  • 2
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    Noise and vibration level reduction by covering metal structures with layers of damping materials (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: One of the most important methods of reducing the noise and vibration level is the damping of the secondary sources, such as metal plates, often used in vehicle structures, by means of covering materials with high internal viscosity. Damping layers are chosen at an optimum thickness corresponding to the frequency and temperature range in which a certain structure works. The structure's response corresponding to various real situations is analyzed by means of a measuring chain including electroacoustical or electromechanical transducers. The experimental results provide the dependence of the loss factor and damping transmission coefficient as a function of the damping layer thickness or of the frequency for various viscoelastic covering materials.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 246-253
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  • 3
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    Vibration and recoil control of pneumatic hammers (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Vibration sources are described for pneumatic hammers used in the mining industry (pick hammers), in boiler shops (riveting hammers), etc., bringing to light the fact that the principal vibration source is the variation in air pressure inside the cylinder. The present state of the art of vibration control of pneumatic hammers as it is practiced abroad, and the solutions adopted for this purpose, are discussed. A new type of pneumatic hammer with a low noise and vibration level is presented.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 79-84
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  • 4
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    Vibration control in forge hammers (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Special measures are discussed for calculating, designing and executing a forge hammer foundation, so that the vibrations that occur during its working will not be transmitted to neighboring machinery, workrooms and offices. These vibrations are harmful to the workers near the forge hammer.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 73-78
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  • 5
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    Experimental determination of the vibration level in 5,100 kW electric locomotive assemblies (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Because of the high vibration level occurring during the running of electric locomotives, mechanical defects occur in the control mechanisms of auxiliary services. This fact has given rise to the necessity of determining the values of these vibrations in electric locomotives during their running. Measurements were conducted on the Craiova-Drobeta-Turnu Severin line, and measures to reduce the vibration level in electric locomotives were instituted.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 50-54
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  • 6
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    Random vibrations of linear viscoelastic beams with lumped masses (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: A method is presented of determining the mean square transversal deflection of an isotropic and homogeneous linear viscoelastic beam having a certain number of lengthwise distributed lumped masses. It is assumed that the beam is acted upon by a stationary random process uniformly distributed along the beam. The method is useful in vibration level control by means of additional lumped masses.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 36-42
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  • 7
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    Random vibrations of quadratic damping systems (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: An oscillating system with quadratic damping subjected to white noise excitation is replaced by a nonlinear, statistically equivalent system for which the associated Fokker-Planck equation can be exactly solved. The mean square responses are calculated and the optimum damping coefficient is determined with respect to the minimum mean square acceleration criteria. An application of these results to the optimization of automobile suspension damping is given.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 29-35
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  • 8
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    The response of many-storied structures under seismic actions (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: A seismic action which is characterized by the acceleration function of the seismic motion is analyzed. The equations of motion in the direction of the seismic action are determined for a completely rigid ground and for a ground with linear deformability characteristics (rotation deformability). The equation for the rotation motion is derived by considering elastic and viscoelastic properties of the foundation ground. The differential equations are written by treating the mechanical model of a many-storied structure as a fixed vertical beam with a uniformly distributed mass as well as with concentrated masses on each floor.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 43-49
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  • 9
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    Insulation of nonlinear and random vibrations in the mining industry (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The insulation of nonlinear and random vibrations is considered for some ore preparing and sorting implements: rotary crushers, resonance screens, hammer mills, etc. The appearance of subharmonic vibrations is analyzed, and the conditions for their appearance are determined. A method is given for calculating the insulation of these vibrations by means of elastic elements made of rubber. The insulation of the random vibrations produced by Symons crushers is calculated by determining the transmissability and deformation of the insulation system for a narrow band random response.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 22-28
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  • 10
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    A mathematical model for storied buildings subjected to automatic loom stresses (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: Expressions are derived for the displacements of a many storied building subjected to the action of classical weaving looms located at different levels of the building. The building is regarded as a vertical fixed beam with a uniformly distributed mass as well as concentrated masses at each level. The calculation relations are obtained on the assumption of harmonic variation of the forces acting at each level as well as the assumption of narrow band stationary random excitatory forces.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 15-21
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  • 11
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    Study of vibrations produced by a vibrating beam used for vibrating concretes (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: For compacting concretes in building, vibrating beams are used. The vibrations are generated by inertial vibrators, and the beam is normally displaced by the operator by means of a handle that is elastically fastened to the beam by means of rubber pads. Considered are vibrations transmitted to the operator, taking into account the beam's shock vibration motions. The steady state motion of a dynamic beam pattern is studied, and results of experimental tests with existing equipment are presented.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 9-14
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  • 12
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    Stresses in dome-shaped shells of revolution with discontinuities at the apex (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-04-02
    Beschreibung: Asymptotic solutions of Novozhilov's equations of shells of revolution are derived for axisymmetric and first harmonic loadings. The solutions obtained are valid throughout the shallow and nonshallow regions. Stresses in dome shaped shells of revolution with a discontinuity in the form of a circular hole, a circular rigid insert, or a nozzle at the apex have been investigated. Numerical results are obtained for spheres, ellipsoids, and paraboloids, containing a discontinuity under a internal pressure and moment. Curves depicting stress distributions are given. The influence of three types of discontinuity on the stresses of the shells is also given.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Multivariant Function Model Generation; 118 p
    Format: text
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  • 13
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    Application of advanced signal processing techniques to the rectification and registration of spaceborne imagery (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-05-07
    Beschreibung: The development of an ERTS/MSS image processing system responsive to the needs of the user community is discussed. An overview of the TRW ERTS/MSS processor is presented, followed by a more detailed discussion of image processing functions satisfied by the system. The particular functions chosen for discussion are evolved from advanced signal processing techniques rooted in the areas of communication and control. These examples show how classical aerospace technology can be transferred to solve the more contemporary problems confronting the users of spaceborne imagery.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Chamber of Commerce Proc. of the 1st 1974 Technol. Transfer Conf.; p 245-255
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  • 14
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    The application of natural science data to land management decision-making (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-05-07
    Beschreibung: A natural environmental analysis process which allows the decision maker to know the probable consequences of a decision prior to the act is developed. Emphasis is placed on the fit between the natural environment and the social, economic, and functional attributes of man's communities and the transition from nature in its present state to various forms and intensities of development. Applications of the analysis are examined. It is concluded that the analysis is a workable system for land use management.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Chamber of Commerce Proc. of the 1st 1974 Technol. Transfer Conf.; p 219-228
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  • 15
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    Current structural vibration problems associated with noise (1974)
    In:  CASI
    Details
    Publikationsdatum: 2011-10-14
    Beschreibung: As the performance of aerospace vehicles has increased, the noise generated by the propulsion system and by the passage of the vehicle through the air has also increased. Further increases in performance are now underway for space vehicles such as the space shuttle vehicle and for short distance takeoff and landing (STOL) aircraft, and are being planned for supersonic aircraft. The flight profiles and design features of these high-performance vehicles are reviewed and an estimate made of selected noise-induced structural vibration problems. Considerations for the prevention of acoustic fatigue, noise transmission, and electronic instrument malfunction are discussed.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: AGARD Noise Mech.; 16 p
    Format: text
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  • 16
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    Comment on satellite altimeter data (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: SKYLAB mission SEASAT-B altimeter observations in combination with surface gravity measurements provide useful data on the marine geoid and expected ocean perturbations from analyses of seamount structures.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA, Washington Seasat-A Sci. Contrib.; p 38
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  • 17
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    Inclusion of transverse shear deformation in finite element displacement formulations (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: A stiffness matrix is derived for a beam element with transverse shear deformation. It is shown that straightforward energy minimization yields the correct stiffness matrix in displacement formulations when transverse shear effects are considered. Since the TIM4 beam element does not represent the geometric boundary conditions for a cantilever beam the rotation of the normal must be retained as a grid point degree of freedom.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: AIAA Journal; 12; Nov. 197
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  • 18
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    Baring high-albedo soils by overgrazing - A hypothesized desertification mechanism (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Observations are reported of high-albedo soils denuded by overgrazing which appear bright, in high contrast to regions covered by natural vegetation. Measurements and modeling show that the denuded surfaces are cooler, when compared under sunlit conditions. This observed 'thermal depression' effect should, on theoretical grounds, result in a decreased lifting of air necessary for cloud formation and precipitation, and thus lead to regional climatic desertification.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Science; 186; Nov. 8
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  • 19
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    Microcraters formed in glass by projectiles of various densities (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: An experiment was conducted investigating the effect of projectile density on the structure and size of craters in soda lime glass and fused quartz. The projectiles were spheres of polystyrene-divinylbenzene (PS-DVB), aluminum, and iron with velocities between 0.5 and 15 km/sec and diameters between 0.4 and 5 microns. The projectile densities spanned the range expected for primary and secondary particles of micrometer size at the lunar surface, and the velocities spanned the lower range of micrometeoroid velocities and the upper range of secondary projectile velocities. There are changes in crater morphology as the impact velocity increases, and the transitions occur at lower velocities for the projectiles of higher density. The sequence of morphological features of the craters found for PS-DVB impacting soda lime glass for increasing impact velocity, described in a previous work (Mandeville and Vedder, 1971), also occurs in fused quartz and in both targets with the more dense aluminum and iron projectiles. Each transition in morphology occurs at impact velocities generating a certain pressure in the target. High density projectiles require a lower velocity than low-density projectiles to generate a given shock pressure.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Journal of Geophysical Research; 79; Aug. 10
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  • 20
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    Approximate techniques of structural reanalysis (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: A study is made of two approximate techniques for structural reanalysis. These include Taylor series expansions for response variables in terms of design variables and the reduced-basis method. In addition, modifications to these techniques are proposed to overcome some of their major drawbacks. The modifications include a rational approach to the selection of the reduced-basis vectors and the use of Taylor series approximation in an iterative process. For the reduced basis a normalized set of vectors is chosen which consists of the original analyzed design and the first-order sensitivity analysis vectors. The use of the Taylor series approximation as a first (initial) estimate in an iterative process, can lead to significant improvements in accuracy, even with one iteration cycle. Therefore, the range of applicability of the reanalysis technique can be extended. Numerical examples are presented which demonstrate the gain in accuracy obtained by using the proposed modification techniques, for a wide range of variations in the design variables.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Computers and Structures; 4; Aug. 197
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  • 21
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    Static, stability, and dynamic analysis of shells of revolution by numerical integration - A comparison (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Recent innovations in digital computer technology have enabled engineers to analyze shell structures of complex configurations without unduly restrictive approximations. An attempt is made to compare the various programs now generally available from the point of view of the advantages of the relative technique utilized, as well as the programmed state of the art. Many of the comparisons are based on the sample problems solved by the STARS-2 system of programs. These examples indicate both the structural detail which can be analyzed by, and the analytical capabilities available in, the numerical shell-of-revolution programs. All advantages and differences are demonstrated by use of solutions for realistic shell problems in the areas of statics, stability, vibrations, and dynamic response of shells subjected to time-dependent loadings.
    Schlagwort(e): STRUCTURAL MECHANICS
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  • 22
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    Forced vibrations of multi-component compliant tanks and feedlines (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: An analytical and experimental research program was performed to investigate the effects of flexible tanks and lines and the total system dynamic response of a simple physical system which had some of the essential features of a liquid-fueled launch vehicle. Several vessel-wall materials were used to obtain a range of elastic moduli. Water was used to simulate the fuel and an electromagnetic shaker provided external excitation such as might originate from a rocket-propulsion system. Experimental data were compared to values obtained from mathematical models for the many degree-of-freedom lumped-mass representation.
    Schlagwort(e): STRUCTURAL MECHANICS
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  • 23
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    Nonproportional loading limit for structures (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The design of most structures involves ensuring integrity for several independent loading conditions. Often, it is rational to design these, exploiting the ductility of the materials to reduce structural costs. Then, ensuring integrity evokes the need for nonmonotonic limit analyses. A groundwork is laid for implementing these analyses. An alternate limit load characterization to that of Greenberg is provided, a mathematical statement of the problem leading to both monotonic (proportional) and nonmonotonic limit loads values is formulated, a direct limit load analysis procedure for analysis within a finite-element framework is described, and limit loads for sets of simple structures are evaluated. A direct limit analysis process is described, and monotonic limit loads are characterized. The process furnishes 'exact' values of limit loads with increasing efficiency as the number of structural elements and force redundancy decreases. Tests show that the accuracy of predicting nonmonotonic limit loads is very sensitive to the number of degrees of freedom in the analysis compared with the total number in the model.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Computers and Structures; 4; Mar. 197
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  • 24
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    Adhesive fracture mechanics (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: In studies of fracture mechanics the adhesive fracture energy is regarded as a fundamental property of the adhesive system. It is pointed out that the value of the adhesive fracture energy depends on surface preparation, curing conditions, and absorbed monolayers. A test method reported makes use of a disk whose peripheral part is bonded to a substrate material. Pressure is injected into the unbonded central part of the disk. At a certain critical pressure value adhesive failure can be observed. A numerical stress analysis involving arbitrary geometries is conducted.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: International Journal of Fracture; 10; Mar. 197
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  • 25
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    Remote sensing and snowpack management (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The present work describes the use of an airborne electromagnetic sensing system for measuring snowpack depth, density, and water content. A transmitter sends a sequence of pulses of stepped frequencies, and the reflections are measured by a sensitive receiver. The combination of the snowpack and the earth interacts with the electromagnetic wave so as to modify the characteristics of the reflected signals. The variation of the reflected intensity with frequency provides the desired data. A theoretical analysis of return signal and snowpack parameter relationships is given, and the results of experimental verification of the theory are discussed.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: American Water Works Association; vol. 66
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  • 26
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    Wheat - Its growth and disease severity as deduced from ERTS-1 (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The spectral reflectance of a cropped surface changes as the plant develops. An indicator of crop growth is leaf area index (ratio of green leaf area to soil area). The leaf area index, disease severity, and yield were determined for several winter wheat fields in Kansas during the 1973 growing season. Multispectral scanner (MSS) data from Earth Resources Technology Satellite-1 (ERTS-1) showed a high correlation (r greater than or equal to 0.90) between crop growth and MSS4/MSS5, and crop growth and MSS5/MSS6. Wheat disease severity and yields were significantly correlated at the 5% level with MSS4/MSS6 and with MSS4/MSS7. Further investigation is required before ERTS imagery can be routinely used detecting and estimating disease severity and yield reduction.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Remote Sensing of Environment; 3; 4, 19; 1974
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  • 27
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    Microwave maps of the polar ice of the earth (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Synoptic views of the entire polar regions of earth have been obtained free of the usual persistent cloud cover using a scanning microwave radiometer operating at a wavelength of 1.55 cm on board the Nimbus-5 satellite. Three different views at each pole are presented utilizing data obtained at approximately one-month intervals from December 1972 to February 1973. Large discrepancies exist between the long-term ice cover depicted in various atlases and the actual extent of the canopies. The distribution of multiyear ice in the north polar region is markedly different from that predicted by existing ice dynamics models. Irregularities in the edge of the Antarctic sea ice pack occur that have neither been observed previously nor anticipated. The brightness temperatures of the Greenland and Antarctic glaciers show interesting contours probably related to the ice and snow morphologic structure.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: American Meteorological Society; vol. 55
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  • 28
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    New triangular plate-bending finite element with transverse shear flexibility (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: AIAA Journal; 12; Dec. 197
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  • 29
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    Contribution of space platforms to a ground and airborne remote-sensing programme over active Italian volcanoes (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: ERTS-1 imagery of the volcanic areas of southern Italy was used primarily for the evaluation of space platform capabilties in the domains of regional geology, soil and rock-type classification and, more generally, to study the environment of active volcanoes. The test sites were selected and equipped primarily to monitor thermal emission, but ground truth data was also collected in other domains (reflectance of rocks, soils and vegetation). The test areas were overflown with a two channel thermal scanner, while a thermo camera was used on the ground to monitor the hot spots. The primary goal of this survey was to plot the changes in thermal emission with time in the framework of a research program for the surveillance of active volcanoes. However, another task was an evaluation of emissivity changes by comparing the outputs of the two thermal channels. These results were compared with the reflectance changes observed on multispectral ERTS-1 imagery.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: ESRO European Earth-Resources Satellite Expts.; p 185-197
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  • 30
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    Infrared remote sounding (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Atmospheric radiation was measured as a function of wavelength, position, angle, and time. Radiation was determined by temperature, cloud (aerosol), composition, and surface emissivity measurements. The theory of radiative transfer is reviewed, along with retrieval methods. Instruments onboard space probes for infrared remote sounding of planetary atmospheres are also described.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Calif. Univ. Proc. of the UCLA Intern. Conf. on Radiation and Remote Probing of the Atmosphere; p 471-506
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  • 31
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    Refinement of the Goloseyev catalog point coordinates in the limb zone and determination of point coordinates on the back side of the moon (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Lunar photography from Zond 6 showed half the side of the moon which is not visible from the earth, and this made it possible to construct a photogrammetric grid encompassing the entire Western Hemisphere and referenced to points of the visible side, whose coordinates were taken from the Goloseyev catalog. The problem was solved using two pictures taken from approximately 9000 km above the lunar surface. The photogrammetric grid was constructed by joint statistical analysis of the measurements of both pictures and the selenographic coordinates of the catalog points. A special algorithm was developed and a program compiled realizing the maximum likelihood method which permitted working with up to 120 catalog points simultaneously.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 257-272
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  • 32
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    Determination of selenographic coordinates of lunar surface points from single pictures obtained from Zond 6 (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Pictures of the lunar surface with an image of practically the entire lunar limb were obtained from the Zond 6 spacecraft. During the time of exposure, the entire lunar surface covered by these photographs was illuminated by the sun. Such single pictures were used to find the external orientation elements and selenographic coordinates of the photographed lunar surface points. The selenographic coordinate system was specified by the Goloseyev catalog and was realized by points of this catalog identified on the pictures and termed reference points. Craters located on the invisible side of the moon and also other points of the Goloseyev catalog, which could be used as control points, were taken as the points being determined. The technique used to compute the selenographic coordinates of the points is outlined.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 272-282
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  • 33
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    Determination of dynamic corrections to point coordinates of photographs obtained by the Zond 6 and Zond 8 spacecraft (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The linear and angular motions of the Zond 6 and Zond 8 spacecraft imaging camera during the exposure cause displacements of the optical image points. In the case of instantaneous exposure of each individual point and the nonsimultaneous exposure of the complete frame, this leads to finite geometric shifts of the points without causing blurring of the photographic image. Therefore, when measuring the resulting photographic pictures, the problem arises of reducing the picture point positions to a common instant of time. This reduction is performed by means of dynamic corrections to the measured picture point coordinates. These corrections are found by using formulas of dynamic photogrammetry. Their use with the Zond space probe photographs is described.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 245-257
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  • 34
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    Evaluating the accuracy of selenodesic reference grids (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Estimates were made of the accuracy of reference point grids using the technique of calculating the errors from theoretical analysis. Factors taken into consideration were: telescope accuracy, number of photographs, and libration amplitude. To solve the problem, formulas were used for the relationship between the coordinates of lunar surface points and their images on the photograph.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 231-245
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  • 35
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    Identification characteristics of certain lunar relief forms on pictures obtained from spacecraft (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: This investigation was restricted to the determination of recognitional characteristics of a single type of relief form, dimple craters on the surface of maria. These craters were arbitrarily considered as closed, negative relief forms, circular in plan-view, and symmetric relative to the center. Two techniques were used to determine the shadow configuration in the craters: (1) experimental determination of the shadow edge by illuminating the models of different profile shapes with a parallel light beam; and (2) geometric construction of the shadow edge using a vertical section of the formation in the direction of the solar rays. A morphological map of the surface which includes the following factors can be compiled using the proposed identification technique: crater profile nature, crater diameter, ratio of diameter and depth, sharpness of the lip, and distribution density of the forms.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 205-215
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  • 36
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    Use of TV pictures obtained from weather satellites to study the geological structure of the earth (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Results are presented of Soviet investigations into the use of television imagery obtained from meteorological satellites for the interpretation of tectonics, lithology, and structural properties of the earth. The area investigated encompassed the eastern part of Iran, and the western regions of Afghanistan and Pakistan. Interpretation of the features identified during the analysis was accomplished by comparing these features with physical, geographic, geological, and tectonic maps. It was concluded that television pictures of the earth from space can be used for geological and structural analysis.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 190-194
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  • 37
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    On the determination of certain astronomical, selenodesic, and gravitational parameters of the moon (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: A method was examined for joint construction of a selenocentric fundamental system which can be realized by a coordinate catalog of reference contour points uniformly positioned over the entire lunar surface, and determination of the parameters characterizing the gravitational field, rotation, and orbital motion of the moon. Characteristic of the problem formulation is the introduction of a new complex of inconometric measurements which can be made using pictures obtained from an artificial lunar satellite. The proposed method can be used to solve similar problems on any other planet for which surface images can be obtained from a spacecraft. Characteristic of the proposed technique for solving the problem is the joint statistical analysis of all forms of measurements: orbital iconometric, earth-based trajectory, and also a priori information on the parameters in question which is known from earth-based astronomical studies.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 215-231
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  • 38
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    Experience in integrated geological and geographical interpretation of space photographs obtained in the USSR (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Two examples of regional interpretation of imagery acquired from satellite photographic and television systems are discussed. The imagery was taken aboard the Zond 7 and Kosmos satellites, and depicted; (1) sand and dust storm activity in the eastern Mediterranean Sea area; and (2) landscape and structural properties of territory of southwestern United States and northwestern Mexico.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 182-189
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  • 39
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    Geological and geophysical studies from space and prospects for their development (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The possibilities of using images obtained by devices which detect the reflected and self-radiation of the the earth's surface and atmosphere in other parts of the spectrum, other than visible, were analyzed. Considered were: (1) infrared; (2) radiothermal; and (3) magnetic field.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 174-181
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  • 40
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    System for electronic transformation and geographic correlation of satellite television information (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: An electronic transformation and correlation system has been developed for the Meteor space weather system which provides transformation and scaling of the original picture, accounts for satellite flight altitude and inclinations of the optical axes of the transmitting devices, and simultaneously superposes the geographical coordinate grid on the transformed picture.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 155-164
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  • 41
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    Geographical correlation of TV and IR images obtained from weather satellites (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The requirements on the accuracy of geographical correlation of TV and IR cloud cover images are determined by the objective of the analysis of the weather information contained in these images. In the operational analysis case, the correlation accuracy need not be high. Errors of several tens of kilometers in determining the location of the cloud formation contours are considered acceptable in this case. Such correlation must be provided in real image reception time. Scientific studies require accurate correlation of the cloud formation contours. The errors in determining their position should be commensurate with the imaging system resolution. The geometric aspects of developing methods and equipment for geographical correlation of television and infrared images of cloud cover taken from Meteor satellites are discussed.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 146-155
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  • 42
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    Geographic correlation of television pictures obtained from weather satellites (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The geographical control of satellite pictures, using the terminology of aerial photography, can be treated as the problem of analysis of a single picture with the objective of obtaining a ground contour map. Studies have shown the possibility and capability of the method of composing photographic maps from transformed television pictures. Optico-mechanical transformation solves the problem of geographical correlation for operational purposes. However, this technique does not compensate for electronic distortion, and accounts for earth sphericity only approximately. However, for certain purposes (studying ice drift), the maximum possible accuracy is required. Analytic geographical correlation methods using digital computers should be considered promising.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 143-145
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  • 43
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    Geometric distortions of autocollimation type scanners (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: One criterion of image quality is its geometric similarity to the control test. The ability of television, phototelevision, phototelegraphic, and other systems to transmit geometrically similar images is characterized by the geometric distortion coefficient. Linear distortions result from the inaccuracy of scanning mechanism element assembly, and distortions can be minimized during adjustment operations or may be easily compensated during image reception. Brief descriptions are given of the possible sources of nonlinear distortions which arise in these devices due to the scanning mechanism, objective distortion, or the nodding mirror.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 48-51
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  • 44
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    Geometric distortions of opticommercial panoramic television systems (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: One of the problems solvable by the spaceborne television system, topographical surveying, makes high demands on image quality, particularly on the geometric distortions introduced by the television camera. It is the geometric distortions which determine measurement accuracy and, consequently, the possibility of creating reliable planetary surface maps. Comparative analysis of the different television systems capable of solving the problem showed that the requirements on quality of the transmitted images are best satisfied by television cameras with opticomechanical scanning. The design of panoramic television systems and the process of image construction by the opticomechanical camera are discussed. Results indicate that panoramic television cameras have the necessary instrumental accuracy and permit determination of the direction to objects with an error practically equal to the resolution.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 51-59
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  • 45
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    Determining iconometric parameters of imaging devices using a wide-angle collimator (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The problem of determining the iconometric parameters of the imaging device can be solved if the camera being calibrated is used to obtain the image of a group of reference points, the directions to which are known. In order to specify the imaging device coordinate system, it is sufficient in principle to obtain on the picture the images of three reference points which do not lie on a single straight line. Many more such points are required in order to determine the distortion corrections, and they must be distributed uniformly over the entire field of view of the camera being calibrated. Experimental studies were made using this technique to calibrate photographic and phototelevision systems. Evaluation of the results of these experiments permits recommending collimators for calibrating television and phototelevision imaging systems, and also short-focus small-format photographic cameras.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 41-47
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  • 46
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    Future development of IR thermovision weather satellite equipment (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The self radiation of the surface being viewed is used for image synthesis in IR thermovision equipment. The installation of such equipment aboard weather satellites makes it possible to obtain cloud cover pictures of the earth's surface in a complete orbit, regardless of the illumination conditions, and also provides quantitative information on the underlying surface temperature and cloud top height. Such equipment is used successfully aboard the Soviet satellites of the Meteor system, and experimentally on the American satellites of the Nimbus series. With regard to surface resolution, the present-day IR weather satellite equipment is inferior to the television equipment. This is due primarily to the comparatively low detectivity of the IR detectors used. While IR equipment has several fundamental advantages in comparison with the conventional television equipment, the problem arises of determining the possibility for future development of weather satellite IR thermovision equipment. Criteria are examined for evaluating the quality of IR.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 29-41
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  • 47
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    Iconics and iconology (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The term iconics covers the complex of methods and equipment for obtaining images, integrated on a common methodological basis. The concept combines such methods and equipment for obtaining images as photography, television, phototelevision, thermovision, and radar. The term iconics has been used previously, but in a narrower sense, as the name for the theory of image reproduction systems, primarily in the sense of their optimization. Iconics must include two branches; theoretical and practical. The system optimization problem then takes its place in theoretical iconics along with other problems. The term iconology has been proposed to cover the complex of image interpretation methods and equipment.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 1-20
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  • 48
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    Prospects for the development of phototelevision methods in space studies (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: In-space imaging of the surface of celestial bodies can be carried out by both television and photographic equipment. Television equipment of various types has the important property of being capable of transmitting imagery in real time. Frequently this is not possible because of the nature of information transmission over the spacecraft-ground communication line. The inadequate energy handling capacity of the communication lines usually requires storage of the video information aboard the spacecraft for subsequent transmission at a definite time and rate. For this purpose, the television camera can be connected with a magnetic memory, or the television imagery may be stored on photographic film. The television/photographic film system has been termed phototelevision. The choice of a system of one type or the other is dictated by several considerations, the most important of which are the size and weight characteristics, other conditions being the same (power consumption, reliability, etc.). The advantages and disadvantages of the two systems are discussed and examples are given of types of satellites on which the two types have been employed.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Space Iconics (NASA-TT-F-798); p 21-28
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  • 49
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    Mineral resources, geological structures, and landform surveys (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Since March 1973 there has been a shift in ERTS results in geology from the initial show-and-tell stage to a period in which scientific studies predominated, and now to an emphasis on effective applications having economic benefits and clearcut relevance to national needs. Many years will be spent on geological tasks resulting from ERTS alone; reconnaissance mapping in inaccessible regions, map revisions, regional or synoptic analysis of crustal fractures, assessment of dynamic surficial processes, systematic search for mineral wealth, use of sophisticated enhancement techniques, recognition of potential geologic hazards, and many more applications that still need to be defined.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Third ERTS Symp., Vol. 2; p 147-167
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    Land use and mapping (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The ERTS program provides data that can be used to derive information relative to the actual use of the land resource, in a practical and timely manner. ERTS data provide coverage of total land areas, and its repetitive nature enables the detection and monitoring of changes taking place in land use. Generally, the techniques and the procedures used to extract information from ERTS data may be categorized as pertaining to either the interpretations of ERTS imagery or to the use of digital data and computer techniques. Examples are given of the use of ERTS-1 data for land use classification in: (1) New England areas; (2) Chesapeake Bay and Washington, D.C.; (3) Mississippi Gulf Coast; (4) Los Angeles, California; (5) Houston, Texas; and (6) Phoenix, Arizona.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Third ERTS Symp., Vol. 2; p 138-146
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  • 51
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    Water resources (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: ERTS-1 applications in snow and ice monitoring, surface water monitoring, including monitoring of wetland areas and flood inundated area mapping, and also watershed monitoring for runoff prediction are discussed. Results also indicate that geological features can be noted which relate to ground water. ERTS-1 data can be used successfully in operational situations by water resources management agencies.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Third ERTS Symp., Vol. 2; p 126-137
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  • 52
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    Agriculture, forestry, range resources (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The necessary elements to perform global inventories of agriculture, forestry, and range resources are being brought together through the use of satellites, sensors, computers, mathematics, and phenomenology. Results of ERTS-1 applications in these areas, as well as soil mapping, are described.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Third ERTS Symp., Vol. 2; p 116-125
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  • 53
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    Automated strip mine and reclamation mapping from ERTS (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: In response to the urgent need for a faster and more economical means of generating strip mine and reclamation maps, a study was conducted to evaluate the suitability of using ERTS computer compatible tape for automatic mapping. The procedure uses computer target spectral recognition techniques as a basis for classification. The area encompassed by this investigation includes five counties in eastern Ohio that comprise nearly 7,500 square kilometers (3,000 square miles). The counties have been disrupted by coal mining since the early 1800's, and strip mining has been practiced in all of them. The environmental effects of strip mining are also discussed.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA. Goddard Space Flight Center Third ERTS Symp., Vol. 2; p 87-101
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  • 54
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    A review of initial investigations to utilize ERTS-1 data in determining the availability and distribution of living marine resources (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The National Marine Fisheries Service has been studying the application of aerospace remote sensing to fisheries management and utilization for many years. The 15-month ERTS study began in July 1972 to: (1) determine the reliability of satellite and high altitude sensors to provide oceanographic parameters in coastal waters; (2) demonstrate the use of remotely-sensed oceanographic information to predict the distribution and abundance of adult menhaden; and (3) demonstrate the potential use of satellites for acquiring information for improving the harvest and management of fisheries resources. The study focused on a coastal area in the north-central portion of the Gulf of Mexico, including parts of Alabama, Mississippi, and Louisiana. The test area used in the final analysis was the Mississippi Sound and the area outside the barrier islands to approximately the 18-meter (10-fathom) curve.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA. Goddard Space Flight Center Third ERTS Symp., Vol. 2; p 76-86
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  • 55
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    ERTS program of the US Army Corps of Engineers (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: The Army Corps of Engineers research and development efforts associated with the ERTS Program are confined to applications of investigation, design, construction, operation, and maintenance of water resource projects. Problems investigated covered: (1) resource inventory; (2) environmental impact; (3) pollution monitoring; (4) water circulation; (5) sediment transport; (6) data collection systems; (7) engineering; and (8) model verification. These problem areas were investigated in relation to bays, reservoirs, lakes, rivers, coasts, and regions. ERTS-1 imagery has been extremely valuable in developing techniques and is now being used in everyday applications.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA. Goddard Space Flight Center Third ERTS Symp., Vol. 2; p 62-75
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    An evaluation of the suitability of ERTS data for the purposes of petroleum exploration (1974)
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    Publikationsdatum: 2011-08-16
    Beschreibung: This investigation was undertaken to determine the types and amounts of information valuable to petroleum exploration that are extractable from ERTS data and to determine the cost of obtaining the information from ERTS relative to costs using traditional or conventional means. In particular, it was desirable to evaluate this new petroleum exploration tool in a geologically well-known area in order to assess its potential usefulness in an unknown area. In light of the current energy situation, it is felt that such an evaluation is important in order to best utilize technical efforts with customary exploration tools, by rapidly focusing attention on the most promising areas in order to reduce the time required to go through the exploration cycle and to maximize cost savings. The Anadarko Basin lies in western Oklahoma and the panhandle of Texas (Figure 1). It was chosen as a test site because there is a great deal of published information available on the surface and subsurface geology of the area, there are many known structures that act as traps for hydrocarbons, and it is similar to several other large epicontinental sedimentary basins.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA. Goddard Space Flight Center Third ERTS Symp., Vol. 2; p 50-61
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  • 57
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    Geologic evaluation and applications of ERTS-1 imagery over Georgia (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Satellite imagery and other remote sensing tools and techniques have provided a powerful tool to assist geologic research; significantly increased the mapping efficiency of field geologists; shown new lineaments associated with known shear and fault zones; delineated new structural features; provided a tool to reevaluate tectonic history; helped to locate potential ground-water sources and areas of aquifer recharge; defined areas of geologic hazards; shown areas of heavy siltation in major reservoirs; and, by close interval repetition, aided in monitoring surface mine reclamation activities and the environmental protection of the intricate marshland system. The Georgia Geological Survey has been engaged in regional mapping for the new state geologic map. ERTS-1 images enlarged to compatible mapping scales have increased field geologic mapping efficiency by at least 25%. There are a number of areas where data from ERTS-1 imagery has allowed a notably higher level of precision than has been available with any amount of field work on the ground.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA. Goddard Space Flight Center Third ERTS Symp., Vol. 2; p 41-49
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  • 58
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    Environmental surveys in Alaska based upon ERTS data (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Alaskan applications of ERTS data are summarized. Areas discussed are: (1) land use; (2) archaeology; (3) vegetation mapping; (4) ice reporting and mapping; (5) permafrost; (6) mineral and oil exploration; (7) geological surveys; (8) seismology; (9) geological faults and structures; (10) hydrology and water resources; (11) glaciology; (12) water circulation in Cook Inlet; and (13) fish and mammal populations.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA. Goddard Space Flight Center Third ERTS Symp., Vol. 2; p 12-40
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  • 59
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    The Canadian ERTS program (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Under a four-year collaborative agreement between the United States and Canada, the Canada Centre for Remote Sensing (CCRS) reads out and distributes the ERTS data of Canada. The Canadian receiving station is at Prince Albert, Saskatchewan, and covers most of Canada except for the East Coast. Production statistics on Canadian ERTS imagery, a summary of several cost benefit case histories, and recommendations for the future of the international aspects of ERTS are discussed and evaluated.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA. Goddard Space Flight Center Third ERTS Symp., Vol. 2; p 7-11
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  • 60
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    Interactive design of large end rings on stiffened conical shells using composites (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Design study methods and results for a composite reinforced base ring for the conical aeroshell structure of the planetary lander vehicle for Project Viking, an unmanned mission to Mars, are presented. The aeroshell is a ring and stringer-stiffened conical shell structure having a half angle of 70 degrees with a large base ring mounted at the outer edge of the cone and a large pay-load ring in the interior with many smaller rings spaced along the inside shell surface. The purpose of the structure is to develop the aerodynamic drag required to decelerate the lander in the Mars atmosphere to facilitiate a soft landing. The design of a shell structure of this complexity requires the use of the latest technology available in a large general-purpose shell buckling program. The large general-purpose non-linear shell buckling program (BOSOR 2) which was used for this purpose is described.
    Schlagwort(e): STRUCTURAL MECHANICS
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  • 61
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    Civil and scientific applications of the geoid (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: SEASAT-A can be used for determining the geoid to much higher accuracy on a world wide basis and in a relatively short time. Two basic objectives can be considered: (1) determination of the geoid to at least 1 meter. This accuracy will satisfy most geodetic requirements for applications purposes; and (2) determination of the geoid to better than 1-meter an oceanographic objective required for measurement of sea surface topography and sea slope, quasi-stationary departure from the geoid, ocean circulation, air and sea interaction, etc. The geodesy objective in this case will be to define a reference equipotential surface as a means by which the oceanographic requirements can be achieved.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA, Washington Seasat-A Sci. Contrib.; p 79-84
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  • 62
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    Boundary value problems with incremental plasticity in granular media (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Discussion of the critical state concept in terms of an incremental theory of plasticity in granular (soil) media, and formulation of the governing equations which are convenient for a computational scheme using the finite element method. It is shown that the critical state concept with its representation by the classical incremental theory of plasticity can provide a powerful means for solving a wide variety of boundary value problems in soil media.
    Schlagwort(e): STRUCTURAL MECHANICS
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  • 63
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    A solution to the contact of two rough spherical surfaces (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The influence of roughness on the interfacial pressure distribution in the contact of two spherical surfaces is considered. An approximate general solution is presented and it is shown that the pressure for all radii can be determined solely from a reference pressure which is, in turn, a function of two parameters - a dimensionless roughness and a dimensionless hardness. Values for the radius of contact are also presented.
    Schlagwort(e): STRUCTURAL MECHANICS
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  • 64
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    Microwave profiling of snowpack free-water content (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: A microwave system is proposed to measure the amount of liquid-phase water in a snowpack operating in the range of 1 to 10 GHz. Attenuation of the beam between source and receivers is produced by the water in the snow. The relationships of frequency, distance, and volume percent of water are calculated for an assumed detector sensitivity, together with the estimated cost of a representative system. A laboratory test is described that shows the attenuation for snow at maximum wetness at 9.35 GHz. A configuration is proposed that involves a vertical tube containing microwave and radioactive sources and another vertical tube containing microwave and gamma-ray detectors, so that density and wetness profiles are obtained simultaneously over essentially the same path.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
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  • 65
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    Mixed mode stress field effect in adhesive fracture (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Numerical or analytical analyses were performed on seven different test specimens including blister test, 90-degree peel test, torsion test, and various cone tests. These specimens are in general subjected to complex stress fields having various amounts of Mode I, Mode II, and Mode III loads. The specimens were then constructed using polymethyl methacrylate for the adherends and a transparent polyurethane elastomer (Solithane 113) for the adhesive. This combination permitted direct observation of the bondline as load was applied. Although initial debonds as well as bond end termination singularities were present in all specimens, in some cases the debond did not initiate at the singularity points as would normally have been expected. An explanation for this behavior is presented, as well as a comparison of loading mode effect on those specimens for which the debond did propagate from a bond terminus singular point.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: International Journal of Fracture; 10; Dec. 197
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  • 66
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    Dependence of plate-bending finite element deflections and eigenvalues on Poisson's ratio (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: AIAA Journal; 12; Oct. 197
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  • 67
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    Fracture initiation and propagation in a cylindrical shell containing an initial surface flaw (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: An attempt is made to provide the necessary analytical tools for the application of two different types of fracture criteria to shell structures. Of particular interest is the problem of fracture propagation and arrest in a cylindrical pressure vessel containing an initial surface flaw. It is assumed that the flaw has the most unfavorable geometry and orientation, namely, it is a crack lying on a meridional plane. Stress intensity factor for a part-through crack, and a surface or internal crack with a fully yielded net ligament are considered. Attention is given to constant delta curves for depressurization studies and to depressurization and crack arrest in pressure vessels.
    Schlagwort(e): STRUCTURAL MECHANICS
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  • 68
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    An overview of high temperature metal fatigue: Aspects covered by the 1973 International Conference on Creep and Fatigue (1974)
    In:  CASI
    Details
    Publikationsdatum: 2012-05-22
    Beschreibung: A summary of papers is presented which covers the following broad aspects of high temperature metal fatigue: (1) materials development and characterization; (2) environmental factors, including air, vacuum, helium, iodine, sodium, and radiation environments; (3) general fatigue life relationships; (4) crack growth laws; (5) design code activities; and (6) design and service experience. Illustrative tables accompany the summary.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: AGARD Low Cycle High Temp. Fatigue; 47 p
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  • 69
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    Application of very long baseline interferometry to Astrometry and Geodesy: effects of frequency standard instability on accuracy (1974)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The accuracy of geodetic and astrometric information obtained from very long baseline interferometry (VLBI) observations is dependent upon the stability of the frequency standard, or clock, used at each site of VLBI array. The sensitivities of two hydrogen maser frequency standards of different design to pressure, temperature, and magnetic field variations were measured; and, for one of the standards, sensitivity was found to be severe enough to degrade the information content of VLBI measurements. However, the effect on the geometric and astrometric information of such clock instabilities, with time scales of hours or greater, can be sharply reduced through the use of differencing techniques.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Its Proc. of the Sixth Ann. Precise Time and Time Interval (PTTI) Planning Meeting; p 349-359
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  • 70
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    Identification of structural parameters from helicopter dynamic test data (1974)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A method is presented for obtaining the mass, stiffness, and damping parameters of a linear mathematical model, having fewer degrees of freedom than the structure it represents, directly from dynamic response measurements on the actual helicopter without a priori knowledge of the physical characteristics of the fuselage. The only input information required in the formulation is the approximate natural frequency of each mode and mobility data measured proximate to these frequencies with sinusoidal force excitation applied at only one point on the vehicle. The practicality and numerical soundness of the theoretical development was demonstrated through a computer simulation of an experimental program.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA. Ames Res. Center Rotorcraft Dyn.; p 239-248
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  • 71
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    Application of antiresonance theory to helicopters (1974)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: Antiresonance theory is the principle underlying nonresonant nodes in a structure, and covers both nonresonant nodes occurring naturally and those introduced by devices such as dynamic absorbers and antiresonant isolators. The dynamic antiresonant vibration isolator (DAVI) and the nodale module are examples of the applications of transfer antiresonances. It is shown that antiresonances are eigenvalues, and that they can be determined by matrix iteration. Applications of antiresonance theory to helicopter engineering problems, using the antiresonant eigenvalue equation are suggested.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA. Ames Res. Center Rotorcraft Dyn.; p 101-106
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  • 72
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    Correlation of finite-element structural dynamic analysis with measured free vibration characteristics for a full-scale helicopter fuselage (1974)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The correlation achieved with each program provides the material for a discussion of modeling techniques developed for general application to finite-element dynamic analyses of helicopter airframes. Included are the selection of static and dynamic degrees of freedom, cockpit structural modeling, and the extent of flexible-frame modeling in the transmission support region and in the vicinity of large cut-outs. The sensitivity of predicted results to these modeling assumptions are discussed. Both the Sikorsky Finite-Element Airframe Vibration analysis Program (FRAN/Vibration Analysis) and the NASA Structural Analysis Program (NASTRAN) have been correlated with data taken in full-scale vibration tests of a modified CH-53A helicopter.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA. Ames Res. Center Rotorcraft Dyn.; p 67-80
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  • 73
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    Data resolution versus forestry classification (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: There are no author-identified significant results in this report.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E80-10189 , NASA-CR-160610
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  • 74
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    Transonic single-mode flutter and buffet of a low aspect ratio wing having a subsonic airfoil shape (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Transonic flutter and buffet results obtained from wind-tunnel tests of a low aspect ratio semispan wing model are presented. The tests were conducted to investigate potential transonic aeroelastic problems of vehicles having subsonic airfoil sections. The model employed NACA 00XX-64 airfoil sections in the streamwise direction and had a 14 deg leading edge sweep angle. Aspect ratio, and average thickness were 4.0, 0.35, and 8 percent, respectively. The model was tested at Mach numbers from 0.6 to 0.95 at angles of attack from 0 deg to 15 deg. Two zero lift flutter conditions were found that involved essentially single normal mode vibrations. With boundary layer trips on the model, flutter occurred in a narrow Mach number range centered at about Mach 0.90. The frequency and motion of this flutter were like that of the first normal mode vibration. With the trips removed flutter occurred at a slightly high Mach number but in a mode strongly resembling that of the second normal mode.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TN-D-7346 , A-4966
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  • 75
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    Land use mapping in Erie County, Pennsylvania: A pilot study (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The author has identified the following significant results. A pilot study was conducted to determine the feasibility of mapping land use in the Great Lakes Basin area utilizing ERTS-1 data. Small streams were clearly defined by the presence of trees along their length in predominantly agricultural country. Field patterns were easily differentiated from forested areas; dairy and beef farms were differentiated from other farmlands, but no attempt was made to identify crops. Large railroad lines and major highway systems were identified. The city of Erie and several smaller towns were identified, as well as residential areas between these towns, and docks along the shoreline in Erie. Marshes, forests, and beaches within Presque Isle State Park were correctly identified, using the DCLUS program. Bay water was differentiated from lake water, with a small amount of misclassification.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E75-10401 , NASA-CR-143394 , ORSER-SSEL-TR-24-74
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  • 76
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    TERSSE: Definition of the Total Earth Resources System for the Shuttle Era. Volume 5: Detailed system requirements: Two case studies (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Major resource management missions to be performed by the TERSSE are examined in order to develop an understanding of the form and function of a system designed to perform an operational mission. Factors discussed include: resource manager (user) functions, methods of performing their function, the information flows and information requirements embodied in their function, and the characteristics of the observation system which assists in the management of the resource involved. The missions selected for study are: world crop survey and land resources management. These missions are found to represent opposite ends of the TERSSE spectrum and to support the conclusion that different missions require different systems and must be analyzed in detail to permit proper system development decisions.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA-CR-141771
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  • 77
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    Skylab 4 photographic index and scene identification (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: A quick reference guide to the photographic imagery obtained on Skylab 4 is presented. Place names and descriptors used give sufficient information to identify frames for discussion purposes and are not intended to be used for ground nadir or geographic coverage purposes.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA-TM-X-72440 , JL12-603
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  • 78
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    Transverse vibrations of non-uniform beams (1974)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: The free vibrations of elastic beams with nonuniform characteristics are investigated theoretically by a new method. The new method is seen to combine the advantages of a finite element approach and of a Rayleigh-Ritz analysis. Comparison with the known analytical results for uniform beams shows good convergence of the method for natural frequencies and modes. For internal shear forces and bending moments, the rate of convergence is less rapid. Results from experiments conducted with a cantilevered helicopter blade with strong nonuniformities and also from alternative theoretical methods, indicate that the theory adequately predicts natural frequencies and mode shapes. General guidelines for efficient use of the method are presented.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Journal of Sound and Vibration; 37; Dec. 22
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  • 79
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    Non-linear behavior of fiber composite laminates (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: The non-linear behavior of fiber composite laminates which results from lamina non-linear characteristics was examined. The analysis uses a Ramberg-Osgood representation of the lamina transverse and shear stress strain curves in conjunction with deformation theory to describe the resultant laminate non-linear behavior. A laminate having an arbitrary number of oriented layers and subjected to a general state of membrane stress was treated. Parametric results and comparison with experimental data and prior theoretical results are presented.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-2313 , TFR/7309
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  • 80
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    Failure criteria for viscoelastic materials (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: Research projects concerned with developing a theory of fracture of materials are discussed. The effects of the geometry of the structure and the loads acting on the structure as they influence the failure process are analyzed. The effects of the viscoelastic deformation characteristics of the bulk elastomer on failure behavior are examined. Additional material parameters which control the fracture process are identified.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-138125 , GALCIT-120
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  • 81
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    Advance development of a technique for characterizing the thermomechanical properties of thermally stable polymers (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: The torsional braid experiment has been interfaced with a centralized hierarchical computing system for data acquisition and data processing. Such a system, when matched by the appropriate upgrading of the monitoring techniques, provides high resolution thermomechanical spectra of rigidity and damping, and their derivatives with respect to temperature.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-138123
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  • 82
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    Analysis of laminated, composite, circular cylindrical shells with general boundary conditions (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: This report develops: (1) a refined approximate theory for the static and dynamic analyses of finite, laminated, composite, circular cylindrical shells with general boundary conditions; (2) an exact three-dimensional analysis of simply supported, laminated, composite, circular cylindrical shells, and (3) a thin-shell theory for laminated, composite, circular cylindrical shells. In the refined approximate theory the displacements are assumed piecewise linear across the thickness and the effects of transverse shear deformations and transverse normal stress are included. A variational approach is followed to obtain the governing differential equations and boundary conditions. A general solution of the governing differential equations is also presented. The results obtained by using the refined approximate theory and the thin-shell theory are compared with the exact results for the case of free vibrations of simply supported, laminated, composite, circular cylindrical shells. The refined approximate theory is very accurate, even for thick shells with short nodal distances, whereas thin-shell theory is reasonably accurate only for thin shells at moderate nodal distances and wave number less than 2.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TR-R-412 , L-8828
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  • 83
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    Holographic nondestructive tests performed on composite samples of ceramic-epoxy-fiberglass sandwich structure (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: When a hologram storing more than one wave is illuminated with coherent light, the reconstructed wave fronts interfere with each other or with any other phase-related wave front derived from the illuminating source. This multiple wave front comparison is called holographic interferometry, and its application is called holographic nondestructive testing (HNDT). The theoretical aspects of HNDT techniques and the sensitivity of the holographic system to the geometrical placement of the optical components are briefly discussed. A unique HNDT system which is mobile and possesses variable sensitivity to stress amplitude is discribed, the experimental evidence of the application of this system to the testing of the hidden debonds in a ceramic-epoxy-fiberglass structure used for sample testing of the radome of the Pershing missile system is presented.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TR-R-430 , M-461
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  • 84
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    Procedures for experimental measurement and theoretical analysis of large plastic deformations (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: Theoretical equations are derived and analytical procedures are presented for the interpretation of experimental measurements of large plastic strains in the surface of a plate. Orthogonal gage lengths established on the metal surface are measured before and after deformation. The change in orthogonality after deformation is also measured. Equations yield the principal strains, deviatoric stresses in the absence of surface friction forces, true stresses if the stress normal to the surface is known, and the orientation angle between the deformed gage line and the principal stress-strain axes. Errors in the measurement of nominal strains greater than 3 percent are within engineering accuracy. Applications suggested for this strain measurement system include the large-strain-stress analysis of impact test models, burst tests of spherical or cylindrical pressure vessels, and to augment small-strain instrumentation tests where large strains are anticipated.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TM-X-3027 , E-7661
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  • 85
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    Analysis of three-point-bend test for materials with unequal tension and compression properties (1974)
    In:  CASI
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    Publikationsdatum: 2019-06-27
    Beschreibung: An analysis capability is described for the three-point-bend test applicable to materials of linear but unequal tensile and compressive stress-strain relations. The capability consists of numerous equations of simple form and their graphical representation. Procedures are described to examine the local stress concentrations and failure modes initiation. Examples are given to illustrate the usefulness and ease of application of the capability. Comparisons are made with materials which have equal tensile and compressive properties. The results indicate possible underestimates for flexural modulus or strength ranging from 25 to 50 percent greater than values predicted when accounting for unequal properties. The capability can also be used to reduce test data from three-point-bending tests, extract material properties useful in design from these test data, select test specimen dimensions, and size structural members.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TN-D-7572 , E-7544
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  • 86
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    FORTRAN 4 programs for summarization and analysis of fracture trace and lineament patterns (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Systematic and detailed analysis of lineament and fracture trace patterns has long been neglected because of the large number of observations involved in such an analysis. Three FORTRAN 4 programs were written to facilitate this manipulation. TRANSFORM converts the initial fracture map data into a format compatible with AZMAP, whose options allow repetitive manipulation of the data for optimization of the analysis. ROSE creates rose diagrams of the fracture patterns suitable for map overlays and tectonic interpretation. Examples are given and further analysis techniques using output from these programs are discussed.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TM-X-70596 , X-644-74-3
    Format: application/pdf
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  • 87
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    Sensitivity analysis of torsional vibration characteristics of helicopter rotor blades. Part 2: Aerodynamics and sensitivity analysis (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A theoretical investigation of dynamic response characteristics of rotor blades was carried out with special emphasis on torsional degrees-of-freedom. Coupled equations of motion for flapwise bending and torsion were formulated at varying azimuth positions for rotor blades with noncollinear aerodynamic, elastic and mass axes. Both structural and aerodynamic mass, damping and stiffness coefficients were included. The variations of a sample blade at different flight conditions were investigated from these equations. The obtained numerical results were illustrated. The sensitivity of overall blade vibration characteristics to torsional oscillations was also investigated from the equations of motion for the sample blade. The illustrated results show the importance of torsional degrees-of-freedom in rotor blade analysis. Various possibilities of improving the overall response by tuning blade geometric, structural and aerodynamic characteristics are discussed.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-2380
    Format: application/pdf
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  • 88
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    Assembly and analysis of fragmentation data for liquid propellant vessels (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Fragmentation data was assembled and analyzed for exploding liquid propellant vessels. These data were to be retrieved from reports of tests and accidents, including measurements or estimates of blast yield, etc. A significant amount of data was retrieved from a series of tests conducted for measurement of blast and fireball effects of liquid propellant explosions (Project PYRO), a few well-documented accident reports, and a series of tests to determine auto-ignition properties of mixing liquid propellants. The data were reduced and fitted to various statistical functions. Comparisons were made with methods of prediction for blast yield, initial fragment velocities, and fragment range. Reasonably good correlation was achieved. Methods presented in the report allow prediction of fragment patterns, given type and quantity of propellant, type of accident, and time of propellant mixing.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-134538
    Format: application/pdf
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  • 89
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    Mapping of the major structures of the African rift system (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: There are no author-identified significant results in this report.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E75-10215 , NASA-CR-142401
    Format: application/pdf
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  • 90
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    Stress anisotropy and concentration effects in high pressure measurements (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Sodium chloride is used as an internal pressure standard in high pressure research. Possible corrections are discussed which are needed in the calibration of this standard due to the independent effects of stress anisotropy and stress concentration in pressure vessels. The first is due to the lack of a truly hydrostatic state of stress in solid state pressure vessels. The second is due to the difference in the compressibilities between the pressure transmitting substances (sodium chloride) and a stiffer test specimen. These two corrections are then combined and a total correction, as a function of measured pressure, is discussed for two systems presently in use. The predicted value of the combined effect is about 5-10% of the pressure at 30 GPa.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-142600 , REPT-2345
    Format: application/pdf
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  • 91
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    Elastic moduli of precompressed pyrophyllite used in ultrahigh pressure research (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The propagation of ultrasonic pulses in pyrophyllite specimens was studied to determine the effect of specimen precompression on the measured elastic moduli. Measurements were made at room pressure and, for the precompressed specimens, to pressures of 3 kbar. Pyrophyllite was found to be elastically anisotropic, apparently the result of the fabric present in our material. The room pressure adiabatic bulk modulus as measured on specimens made of isostatically compacted powered pyrophyllite was determined to be 96.1 kbar. The wave speeds of ultrasonic pulses in pyrophyllite were found to decrease with increasing specimen precompression. A limiting value of precompression was found, above which no further decrease in wave speed was observed. For the shear wave speeds this occurs at 10 kbar while for the longitudinal wave at 25 kbar. In the limit, the shear waves propagate 20% slower than in the unprecompressed samples; for the longitudinal wave the difference is 30%.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-142598 , REPT-2366
    Format: application/pdf
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  • 92
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    Contact and crack problems for an elastic wedge (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The contact and the crack problems for an elastic wedge of arbitrary angle are considered. The problem is reduced to a singular integral equation which, in the general case, may have a generalized Cauchy kernel. The singularities under the stamp as well as at the wedge apex were studied, and the relevant stress intensity factors are defined. The problem was solved for various wedge geometries and loading conditions. The results may be applicable to certain foundation problems and to crack problems in symmetrically loaded wedges in which cracks initiate from the apex.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-132640
    Format: application/pdf
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  • 93
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    Study to demonstrate the feasibility of and determine the optimum method for remote haze monitoring by satellite (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: There are no author-identified significant results in this report.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E75-10226 , NASA-CR-142412
    Format: application/pdf
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  • 94
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    Application of ERTS-1 imagery to land use, forest density and soil investigations (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: There are no author-identified significant results in this report.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E75-10222 , NASA-CR-142408
    Format: application/pdf
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  • 95
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    Correlation of ocean truth data with ERTS-1 imagery: California coastal sites in Monterey Bay, Santa Barbara Channel, and Santa Monica Bay (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: There are no author-identified significant results in this report.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E75-10220 , NASA-CR-142406
    Format: application/pdf
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  • 96
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    Investigations using data in Alabama from ERTS-A, volume 3 (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: There are no author-identified significant results in this report.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E75-10225 , NASA-CR-142409
    Format: application/pdf
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  • 97
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    Investigations using data in Alabama from ERTS-A, volume 1 (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: There are no author-identified significant results in this report.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E75-10223 , NASA-CR-142411
    Format: application/pdf
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  • 98
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    The effects of soil moisture and plant morphology on the radar backscatter from vegetation (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The results of experimental studies on the backscattering properties of corn, milo, soybeans and alfalfa are presented. The measurements were made during the summer of 1973 over the 8 to 18 GHz frequency band. The data indicate that soil moisture estimation is best accomplished at incidence angles near nadir with lower frequencies, while crop discrimination is best accomplished using two frequencies at incidence angles ranging from 30 deg to 65 deg. It is also shown that temporal plant morphology variations can cause extreme variations in the values of the scattering coefficients. These morphological changes can be caused by growth, heavy rain and in the case of alfalfa, harvesting.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA-CR-141684 , RSL-TR-177-51
    Format: application/pdf
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  • 99
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    Nineteen hundred seventy three significant accomplishments (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Data collected by the Skylab remote sensing satellites was used to develop applications techniques and to combine automatic data classification with statistical clustering methods. Continuing research was concentrated in the correlation and registration of data products and in the definition of the atmospheric effects on remote sensing. The causes of errors encountered in the automated classification of agricultural data are identified. Other applications in forestry, geography, environmental geology, and land use are discussed.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA-TM-X-66863 , JSC-09244
    Format: application/pdf
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  • 100
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    Meteorological data collection via ERTS-A data retransmission facilities (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The author has identified the following significant results. Two meteorological data acquisition systems were built to support hydrometeorological programs related to flow forecasting. Data errors were detected in the stream level formation; these errors were caused by sensor difficulties.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E75-10293 , NASA-CR-142837
    Format: application/pdf
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