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  • General Chemistry  (7,564)
  • SPACE SCIENCES  (6,789)
  • INSTRUMENTATION AND PHOTOGRAPHY  (2,550)
  • Cell & Developmental Biology
  • 1970-1974  (15,039)
  • 1910-1914  (2,932)
Collection
Keywords
Publisher
Years
Year
  • 1
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    Automated analysis of video data (1974)
    In:  CASI
    Details
    Publication Date: 2006-05-07
    Description: A software/hardware system designed and developed to perform automated video imagery analysis is described. Major elements included in the analysis system are: (1) sampling oscilloscope; (2) programmable trigger unit; (3) central computer; and (4) software processing library. The function of the scope and trigger unit, in conjunction with the control computer, is to digitize the selected portion of the video image and store as amplitude and time data in computer memory. Evaluation of the video data, analogus to interpretation of a visual image, is accomplished by the processing software. It is indicated that this technique of video image analysis is applicable to a wide variety of nonaerospace applications involving video data and image analysis.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Chamber of Commerce Proc. of the 1st 1974 Technol. Transfer Conf.; p 181-188
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  • 2
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    A method for determining optimum re-entry trajectories (1974)
    In:  CASI
    Details
    Publication Date: 2006-04-02
    Description: The Pontryagin Maximum Principle is used to formulate the problem of finding optimum atmospheric vehicular reentry trajectories. The optimization problem is that of minimizing an integral which is a function of the state and control variables. The vehicle's motion is assumed to be influenced by a gravitational force and an aerodynamic force. The problem is formulated and the necessary equations are developed simultaneously for three sets of Euler angles. Computational procedures are suggested so that numerical trajectories may be generated.
    Keywords: SPACE SCIENCES
    Type: Multivariant Function Model Generation; 93 p
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  • 3
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    Vehicle control for fuel optimization (1974)
    In:  CASI
    Details
    Publication Date: 2006-04-02
    Description: The problem of predicting the minimum fuel trajectory for a six degree of freedom vehicle which has a motion characterized by the first order differential equations of translational and rotational dynamics is considered. The thrust direction and center of gravity of the vehicle are assumed to be fixed with respect to the vehicle. Thrust magnitude and the control moment are used as control variables and appear linearly in the equation of motion. Pontryagin's Maximum Principle is used to solve the variational problem. With this formulation, the extremal controls are bang-bang with the exception of the singular case.
    Keywords: SPACE SCIENCES
    Type: Multivariant Function Model Generation; 18 p
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  • 4
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    Apparatus for calibration of on-board instruments and laboratory modelling of rarefied plasma flows past models (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Problems of laboratory simulation of artificial earth satellite flight conditions in the ionosphere are examined, and a setup capable of reproducing the basic parameters of ion flows (with energies of 5-10 eV, energy spectrum width approximately 2x5 eV, and an intensity of 10 to the minus 8th power a/cm/2) past measurement instruments and satellite models is described. Possibilities for further improvement of the apparatus are discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 282-291
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  • 5
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    Space flights and questions of law (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Juridical aspects of space flights and international law are elaborated. Considered are manned orbital space stations, as well as lunar or planetary bases and the international exploration of extraterrestrial resources.
    Keywords: SPACE SCIENCES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 170-175
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  • 6
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    Are interstellar flights possible? (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: It is shown that ionic relativistic rockets are most suitable for carrying out interstellar flights in comparison with photonic rockets or nuclear interstellar aircraft. Slow interstellar flights are much more probable than fast flights.
    Keywords: SPACE SCIENCES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 154-160
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  • 7
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    Searching for extra-terrestrial civilizations (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The probability of radio interchange with extraterrestrial civilizations is discussed. Difficulties constitute absorption, scattering, and dispersion of signals by the rarified interstellar medium as well as the deciphering of received signals and convergence of semantic concept. A cybernetic approach considers searching for signals that develop from astroengineering activities of extraterrestrial civilizations.
    Keywords: SPACE SCIENCES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 83-110
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  • 8
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    Multiplicity of inhabited worlds and the problem of setting up contacts among them (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The numerous planetary systems in our galaxy appear to a high degree of probability to contain some planets with a biosphere similar to earth' environment. The possibility of communicating with those extraterrestrial alien planetary civilizations centers on the high level of technological development that is required to overcome the problem of distance. It is conceivable that advanced civilizations can produce energy at a level of 10 to the 43rd power erg/year and that an artificial biosphere can be developed within the limits of 10 to the 22nd power to 10 to the 23rd power cm.
    Keywords: SPACE SCIENCES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 67-78
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  • 9
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    Problem of searching for extra-terrestrial civilizations (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Possible criteria characterizing extraterrestrial civilizations and their detection are: (1) deduction of their existence by evaluating astronomical prerequisites for the development of life in remote planetary systems; (2) detection and communication with extraterrestrial civilizations; and (3) the problem of language and content of information in transmitted signals.
    Keywords: SPACE SCIENCES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 62-66
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  • 10
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    Research on development of equations for performance trajectory computation (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: A computer program for computing the performance trajectory of spacecraft was developed. An analytical study of a minimum fuel flight for high speed aircraft was conducted. The computer program to compute a minimum time reentry into the atmosphere for an Apollo-type capsule is presented. A technical summary of the minimum fuel problem is provided.
    Keywords: SPACE SCIENCES
    Type: Multivariant Function Model Generation; 34 p
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  • 11
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    Use of conventional equipment to measure the effective perceived noise level of aircraft (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: A real time, computerized, measurement method for the effective perceived noise level is reported that uses comparison of two sounds differing in level and frequency to obtain the noise intensity emitted by aircraft and to calculate human psychoacoustic annoyance reactions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: the 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 224-232
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  • 12
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    An objective method and measuring equipment for noise control and acoustic diagnostics of motorcars (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: An objective method and apparatus for noise control and acoustic diagnostics of motorcar engines are reported. The method and apparatus let us know whether the noisiness of the vehicle under test exceeds the admissible threshold levels given by appropriate standards and if so what is the main source of the excessive noise. The method consists in measuring both the overall noise level and the sound pressure levels in definite frequency bands while the engine speed is controlled as well and may be fixed at prescribed values. Whenever the individually adjusted threshold level has been exceeded in any frequency band, a self-sustaining control signal is sent.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The 4th Natl. Conf. on Acoustics Vol. 1A (NASA-TT-F-15375); p 198-204
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  • 13
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    Photoelectronic vibrometer with polarized light (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: A seismic torsiometer is described which is based on the reception by a photosensitive transducer of a light flux modulated by a relative rotation of the optical axes of two polaroids. The torsional vibrations of the polaroid fixed to the shaft are transmitted to the other polaroid (which at the same time is the seismic mass of the apparatus) by means of elastic lamellas. The device can work as accelerometer, vibrometer or frequency meter, depending on the value of the ratio between the proper oscillation frequency of the seismic system and the measured vibration frequency.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 68-72
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  • 14
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    Vibration and noise measuring instruments built in the RSR (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The demands placed upon vibration and noise measuring instruments are discussed. The instruments that are now being manufactured in the RSR are described, as well as those that are being made ready for manufacture, namely: the VP-3 portable vibrometer, the N2103 precision electronic vibrometer, the N2103 B sonometric preamplifier, as well as vibration transducers of the electrodynamic and piezoelectric types.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 62-67
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  • 15
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    Contributions to the problem of piezoelectric accelerometer calibration (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: After discussing the principal calibration methods for piezoelectric accelerometers, an experimental setup for accelerometer calibration by the reciprocity method is described It is shown how the use of a lock-in voltmeter eliminates errors due to viscous damping and electrical loading.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 55-61
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  • 16
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    Instruments for measuring radiant thermal fluxes (1974)
    In:  CASI
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    Publication Date: 2006-01-11
    Description: An absolute two-sided radiometer, designed on the principle of replacing absorbed radiant energy with electrical energy, is described. The sensitive element of the detector is a thermoelectric transducer of thermal flux. The fabrication technology, methods of measurement, technical characteristics, and general operation of the instrument are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 95-101
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  • 17
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    Diurnal and seasonal trends in the incidence of Sudden Commencements (SC) and Sudden Impulses SI (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Based on world data for the period 1 January 1955 to 31 December 1968, reports of 894 SC cases and 2152 SI cases were collected. A study was made of the diurnal and seasonal trends in the incidence of their appearances. It is shown that the diurnal trend is pronounced for all events with a maximum at (06-8)h universal time. The diurnal trend for SC in the resultant period is more pronounced. The seasonal trend in incidence of appearances of SC and SI is absent. Thus, geomagnetic disturbances of both SC and SI are monitored by world time. These results lead to the conclusion that the presence or absence of SC and SI during geomagnetic storms is determined not only by the nature of the corpuscular flux, the presence of shock waves and tangential discontinuities, but also by purely terrestrial conditions.
    Keywords: SPACE SCIENCES
    Type: in its Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 54-68
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  • 18
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    Study of the moon and planets at the Khar'kov State University Astronomical Observatory (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The results of observations of the moon and planets are presented and include: (1) data on the discovery of high porosity values and the broken terrain of the lunar surface, and (2) data on the coloration of lunar rocks. A comparative description is given of data obtained by astronomical and by satellite observations.
    Keywords: SPACE SCIENCES
    Type: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 29-43
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  • 19
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    Long-term integrated radiophysical studies of the ionosphere, near space, and the propagation of radio waves from space objects (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The radiophysical studies reported consist of direct measurements of certain effects induced in the propagation of radio waves from space objects. From measured effects and from data on the motion and position of space objects, physical parameters of the medium and bodies are determined.
    Keywords: SPACE SCIENCES
    Type: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 1-28
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  • 20
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    Development of an analog of lunar soil (1974)
    In:  CASI
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    Publication Date: 2006-01-11
    Description: Volcanic tuff from the Artik deposit in Armenia is especially suited for experiments in simulating lunar soil, with the aid of compaction by vibration.
    Keywords: SPACE SCIENCES
    Type: Current Concepts Regarding the Moon (NASA-TT-F-766); p 186-191
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  • 21
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    Laboratory simulation of processes of evaporation, condensation, and sputtering taking place on the surface of the moon (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Study of evaporation, condensation and sputtering on the moon can provide information on the same processes on other planets, and reveal details of the formation of the lunar regolith. Simulation methods include vacuum evaporation, laser evaporation, and bubbling gas through melts.
    Keywords: SPACE SCIENCES
    Type: Current Concepts Regarding the Moon (NASA-TT-F-766); p 155-185
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  • 22
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    Geological mapping of the moon (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Compilation and labelling of geological and morphological charts on a scale of 1:1,000,000 are discussed with emphasis on the regions of Maria Tranquilitatis, Crisium, Fecunditatis, Humorum and Nukium as well as certain prominent craters.
    Keywords: SPACE SCIENCES
    Type: Current Concepts Regarding the Moon (NASA-TT-F-766); p 97-138
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  • 23
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    Results of investigation of the surface layer of the moon on the basis of its intrinsic radiation (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The intrinsic thermal radiation of the moon is an indicator of the temperature regime of the lunar surface, its physical conditions and structure, as indicated by data from Luna 9 and 13, as well as Surveyor 1 to 7.
    Keywords: SPACE SCIENCES
    Type: Current Concepts Regarding the Moon (NASA-TT-F-766); p 63-96
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  • 24
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    The problem of the structure of the surface of the lunar maria (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The results are described of geological and morphological interpretation of large-scale photographs of the surface of lunar maria. A morphological classification is proposed for small craters. It is shown that the classification of a crater in a given morphological category, reflecting the degree of its morphological maturity, is determined by the age of the given crater. A check on the nature of distribution of small craters, as done on the basis of the nearest neighbor method, show that the distribution is governed by a near-random law. It is found that variations of the probability density function for the craters conform to a normal distribution law. An empirical relation is found for the coefficient of variation as a function of crater diameter and the dimensions of the area on which the counts are made. The rockfalls near craters of various morphological classes are described.
    Keywords: SPACE SCIENCES
    Type: Current Concepts Regarding the Moon (NASA-TT-F-766); p 25-62
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  • 25
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    Determination of local values of gas and liquid mass flux in highly loaded two-phase flow (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A measurement system using a deceleration probe was designed for determining the local values of gas and liquid mass flux in various gas/liquid droplet sprayfields. The system was used to characterize two-phase flowfields generated by gas/liquid rocket-motor injectors. Measurements were made at static pressures up to 500 psia and injected mass flow ratios up to 20. The measurement system can also be used at higher pressures and in gas/solid flowfields.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 26
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    The neutral atmosphere temperature experiment (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The AEROS Neutral Atmosphere Temperature Experiment (NATE) is designed to measure the kinetic temperature of molecular nitrogen in the thermosphere. A quadrupole mass spectrometer tuned to N2 measures the N2 density variation in a small spherical antechamber having a knife-edged orifice which is exposed to the atmosphere at the outer surface of the spacecraft. The changing density of N2 due to the spinning motion of the spacecraft permits determination of the velocity distribution of the N2 from which the temperature is calculated. An alternate mode of operation of the instrument allows measurement of the other gases in the atmosphere as well as N2 permitting determination of the neutral particle composition of the atmosphere.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Zeitschrift fuer Geophysik; 40; 5, 19; 1974
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  • 27
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    Airborne laser Doppler velocimeter (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A CO2 laser Doppler detection system has been developed to measure remotely the true airspeed of an aircraft. The system uses a 50-W sealed-off CO2 laser in a homodyne detection system employing a collinear optical telescope, a HgCdTe detector, and a frequency tracking loop. The system was successfully flight-tested on a NASA Convair 990 research aircraft during December 1971 and June 1972. The results indicate that an airspeed measurement under clear weather conditions is feasible up to an altitude of 3000 m with an error of less than 0.5%.-
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 13; Dec. 197
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  • 28
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    SAS-2 observations of gamma rays from the galactic plane (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Preliminary data are given for the SAS-2 high energy galactic gamma ray observation. These data include both latitude and longitude distributions. The longitude distribution shows a high density region. The latitude distributions toward the center and the anti-center are markedly different, the former showing a two-component structure of half-widths of approximately 3 and 6 deg. The energy spectrum in the range 35 to 200 MeV is hard, consistent with cosmic ray interactions with interstellar matter, including neutral pions decay and emission from energetic electron interactions. The data is consistent with an interpretation in terms of the confinement of the cosmic rays in the spiral arms.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ESRO The Context and Status of Gamma Ray Astronomy; p 201-204
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  • 29
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    Infrared astronomy and the Shuttle (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The infrared spectral range extends approximately from 1 micron to 1000 microns. Observations in infrared astronomy are made with the aid of ground-based telescopes and telescopes flown in aircraft, balloons, or rockets. Advantages and drawbacks of infrared studies conducted by different approaches are discussed. Infrared astronomers are looking forward to observations made from orbiting spacecraft. Present plans call for placing a large telescope aboard the Space Shuttle Orbiter for short missions lasting from seven days to three weeks several times a year. However, the occurrence of a pollution of the spacecraft environment by dust particles and gases coming from the spacecraft might present a problem for the observations. Possible approaches for solving this problem are discussed.
    Keywords: SPACE SCIENCES
    Type: Astronautics and Aeronautics; 12; Oct. 197
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  • 30
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    Galactic X-ray sources (1974)
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    Description: Data on galactic X-ray sources from rocket and balloon experiments and the UHURU satellite are reported. The outline emphasizes general discrete source models and begins with some a priori considerations about X-ray emission mechanisms and their applicability, after which contemporary data are interpreted according to these models. Topics covered include the production of X-rays by various mechanisms, source regimes, observational parameters, stellar distributions, individual stars, flare stars, supernovae and pulsars, the Crab nebula, old and young remnants, binary systems, and others.
    Keywords: SPACE SCIENCES
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  • 31
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    Radio astronomy (1974)
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    Publication Date: 2011-08-16
    Description: The origins, generation, detection, and interpretation of radio signals are discussed for signals with an assumed random polarization. After defining the basic parameters, the discussion moves to such topics as synchrotron radiation, plasma effects, changes in the electron energy spectrum in the radiating regions, energy loss to ionization, bremsstrahlung, radio astronomical observations of high-energy particles, emission by energetic particles, observation of supernova remnants and pulsars, galactic background continuum radiation, and others.
    Keywords: SPACE SCIENCES
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  • 32
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    Evaluation of a wedge gas-sampling probe (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The performances of a wedge-type gas-sampling probe and pitot probes are compared in applications to flowfield profile studies. The flow structure data obtained by these techniques are found to agree well in flow regions with and without significant gradients. The wedge-type probe showed a good service life and allowed a substantial reduction of the sampling time. The wedge probe design is discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA Journal; 12; Sept
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  • 33
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    Jupiter emission observed near 1 MHz (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Emission from Jupiter has been observed by the IMP-6 spacecraft at 19 frequencies between 600 and 9900 kHz covering the period from April 1971 to October 1972. The Jovian bursts were identified in the IMP-6 data through the phase of the observed modulated signal detected from the spinning dipole antenna. Initial data reduction has isolated 177 events over a span of 500 days. These events persisted over a period between 1 and 60 min. Of these events at least 48 occurred during times in which Jupiter emission was being observed at either 16.7 or 22.2 MHz by ground-based instruments of the Goddard Space Flight Center Jupiter monitoring system. Large bursts were detectable from 9900 kHz down to 600 kHz, while smaller bursts ranged down to 1030 kHz.-
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 192; Sept. 1
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  • 34
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    Real-time correction of atmospherically degraded telescope images through image sharpening (1974)
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    Publication Date: 2011-08-16
    Description: We present a new technique for the correction of atmospheric distortion in telescope images. Most of this distortion arises from a random phase variation of the incoming light across the telescope aperture. This variation limits the resolving power of even large telescopes to about one arc second. If the sharpness of the images is defined in a suitable way, this sharpness is maximized only when the phase distortion of the incoming light is zero. We present computer simulations of a simple feedback system in which active optical elements, set to maximize the sharpness, correct most of the atmospheric distortion. Photon statistics set the limiting magnitude of the object for which a practical feedback system can work. Details in a sixth magnitude object smaller than 0.1 sec of arc should be resolvable. The system can be conveniently employed within existing telescopes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Society of America; vol. 64
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  • 35
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    The interplanetary and near-Jupiter meteoroid environments (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The meteoroid penetration detectors on the Pioneer 10 spacecraft recorded 67 meteoroid penetrations through the 25-micron stainless steel test material while the spacecraft was between 1.0 and 5.1 AU. Ten of these penetrations occurred during the encounter with Jupiter. The cumulative spatial density of meteoroids with masses greater than 2 nanograms has been calculated from these data for interplanetary space and for the near-Jupiter space. The spatial density is found to be essentially constant in interplanetary space between 1 and 5 AU, approximately 1 meteoroid per cubic km, and 1-2 orders of magnitude greater near Jupiter. There was no increase in the spatial density of meteoroids in the asteroid belt and hence no evidence that there is a significant asteroidal component of 2-nanogram meteoroids. It is uncertain whether the meteoroids detected near Jupiter were in orbit about Jupiter or were gravitationally focused toward the planet from solar orbits.
    Keywords: SPACE SCIENCES
    Type: Journal of Geophysical Research; 79; Sept. 1
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    Mapping of the moon: Past and present (1974)
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    Publication Date: 2011-08-16
    Description: The present work provides an outline of the history of the efforts to map the topography of the surface of the moon, from the days of pre-telescopic astronomy to the present. The first part of the book covers the time span from 1600 to 1960 and reproduces numerous examples of this early, earth-based selenographic work. The manned lunar missions in the 1960's revolutionized the science of lunar mapping with their high-resolution, close-range photography of the moon. In 1959, a comprehensive lunar mapping program was initiated by two DOD mapping agencies - the U.S. Air Force Aeronautical Chart and Information Center (ACIC) and the U.S. Army Map Service (AMS). In the course of this program, the cause of lunar mapping enlisted for the first time the services of professional cartographers; the outcome of their efforts speedily relegated all previous work into absolescence. The methods and results of this work are described, and the underlying principles of physical selenodesy are set forth, including the definition of lunar coordinates and the methods for a determination of three-dimensional coordinates of lunar features. A section is included on lunar mapping in the U.S.S.R.
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    Influence of rotation on the maximum mass of pulsationally stable stars (1974)
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    Publication Date: 2011-08-16
    Description: The critical mass for stability against radial pulsations in rotating, homogeneous main-sequence stars is found to be greater than in the case of no rotation. Analytic and detailed numerical models show that the critical mass rises steeply with increasing concentration of angular momentum to the center of the star. For uniform rotation near breakup velocity at the star's equator the critical mass is about 850 solar masses if an electron-scattering opacity is used, or about 5000 solar masses if the opacities of Cox and Stewart are used. For nonuniform rotation with a constant ratio of centrifugal force to gravity in the star, the critical mass becomes 'infinite' long before breakup velocity is attained. The relevance of the present results to several observational problems is noted.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 192; Aug. 15
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  • 38
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    The peculiar A star HD 200311 - A photographic region line-identification study (1974)
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    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: vol. 28; June 197
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  • 39
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    Cosmogony of the asteroidal belt (1974)
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    Publication Date: 2011-08-16
    Description: In the plot of asteroids considered the mass density is substituted for the number density. This approach provides a better definition of the limits of the main belt, and demonstrates more clearly that the asteroids, like the Saturnian rings, have condensed from partially corotating plasma. A diagram shows that the whole main belt is located below 2/3 of Jupiter's orbit. This means that the main belt asteroids may have been derived from condensation which took place inside Jupiter's orbit.
    Keywords: SPACE SCIENCES
    Type: Nature; 250; Aug. 23
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  • 40
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    Aplanatic two-mirror telescopes: A systematic study. I - Cassegrainian configuration (1974)
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    Publication Date: 2011-08-16
    Description: A systematic performance analysis of aplanatic Cassegrainian telescopes has been accomplished by means of a ray trace program. The results indicate that the available field angle for a given geometric spot size is, to a very close approximation, a function of the relative back focal distance only. Image curvatures, as computed by third-order theory and by the ray trace program, were found to be in very close agreement. Image curvature is plotted as a function of the ray height ratio for a wide range of secondary magnification.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 13; Sept
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  • 41
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    Image reproduction with interactive graphics (1974)
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    Publication Date: 2011-08-16
    Description: Software application or development in optical image digital data processing requires a fast, good quality, yet inexpensive hard copy of processed images. To achieve this, a Cambo camera with an f 2.8/150-mm Xenotar lens in a Copal shutter having a Graflok back for 4 x 5 Polaroid type 57 pack-film has been interfaced to an existing Adage, AGT-30/Electro-Mechanical Research, EMR 6050 graphic computer system. Time-lapse photography in conjunction with a log to linear voltage transformation has resulted in an interactive system capable of producing a hard copy in 54 sec. The interactive aspect of the system lies in a Tektronix 4002 graphic computer terminal and its associated hard copy unit.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 13; Sept
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  • 42
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    Exploring Jupiter and its satellites with an orbiter (1974)
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    Description: Review of the initial studies that define a challenging Mariner Jupiter Orbiter mission. Elegant and precise astrodynamics are shown to make possible a bravura examination of the entire Jovian system with two Mariner-class spacecraft to be launched in 1981. This mission is expected to advance considerably our understanding of the origin and evolution of the solar system.
    Keywords: SPACE SCIENCES
    Type: Astronautics and Aeronautics; 12; Sept
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  • 43
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    Lunar electrical conductivity (1974)
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    Publication Date: 2011-08-16
    Description: It is pointed out that the lunar magnetometer experiment has made important contributions to studies of the lunar interior. Numerical inversions of the lunar electromagnetic response have been carried out, taking into account a void region behind the moon. The amplitude of the transfer function of an eight-layer model is considered along with a model of the temperature distribution inside the moon and the amplitude of the transfer function of a semiconductor lunar model.
    Keywords: SPACE SCIENCES
    Type: Nature; 250; Aug. 16
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  • 44
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    Radio detection of Jupiter-like extra-solar planets (1974)
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    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: British Interplanetary Society; vol. 27
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  • 45
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    Radiative transitions involving the /2p2/ 3Pe metastable autodetaching state of H- (1974)
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    Publication Date: 2011-08-16
    Description: A Hylleraas bound-state wave function and 1s-2s-2p close-coupling continuum wave functions are used to calculate the absorption coefficient for the free-bound transition of H(1s) + e + quantum to a H anion in (2p2,3Pe) and the differential emission rate for the inverse process. The absorption and emission spectral maximum is found to be at a photon wavelength of 1219.5 A, an improvement of 2 A on other calculations. This free-bound absorption process appears to be a significant source of continuous ultraviolet opacity.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 191; Aug. 1
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  • 46
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    Electron-ion relaxation in a dense plasma (1974)
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    Publication Date: 2011-08-16
    Description: The microscopic physics of the thermonuclear runaway in highly degenerate carbon-oxygen cores is investigated to determine if and how a detonation wave is generated. An expression for the electron-ion relaxation time is derived under the assumption of large degeneracy and extreme relativity of the electrons in a two-temperature plasma. Since the nuclear burning time proves to be several orders of magnitude shorter than the relaxation time, it is concluded that in studying the structure of the detonation wave the electrons and ions must be treated as separate fluids.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 191; Aug. 1
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  • 47
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    Rotational excitation of HCN by collisions (1974)
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    Publication Date: 2011-08-16
    Description: Rate constants for the rotational excitation of HCN by collisions with He atoms at temperatures below 100 K were computed from first principles and are presented in tabular form. The potential energy surface was obtained by using the uniform electron gas model of Gordon and Kim (1972) and then joined smoothly to the asymptotic long-range perturbation theory potential valid at large separations. Quantum close-coupling theory was used to analyze the collision dynamics. Individual rates are believed to be accurate to within 50% above 30 K and within a factor of two below 20 K. The results should be extendable to excitation by collision with H2 and may therefore be of value in the study of interstellar clouds.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 191; Aug. 1
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  • 48
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    Prediction of radio structure in the two largest redshift QSOs (1974)
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    Publication Date: 2011-08-16
    Description: The radio spectral data of OH471 and OQ172 are shown in a graph along with decompositions of the spectra into canonical self-absorbed synchrotron components. The minimum number of canonical components consistent with the data is used. Theoretically expected angular radii and time scales are presented in a table. The estimation of the angular size of a compact radio source with known spectral form rests upon the establishment of its maximum brightness temperature.
    Keywords: SPACE SCIENCES
    Type: Nature; 250; Aug. 9
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  • 49
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    Ozone and the polar hood of Mars (1974)
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    Publication Date: 2011-08-16
    Description: Ozone co-appears with the clouds of the polar hood in the winter hemisphere of Mars, but each is variable from day to day and location to location. Both the appearance of ozone and the polar hood clouds correlate with the temperature of the atmosphere which varies from day to day and location to location. A cold, clean, dry atmosphere is conducive to the formation of ozone.
    Keywords: SPACE SCIENCES
    Type: Icarus; 22; June 197
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  • 50
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    Possible H2/+/ ultraviolet spectrum of Jupiter (1974)
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    Publication Date: 2011-08-16
    Description: An ultraviolet spectral probe for a hydrogen-rich planetary atmosphere, such as that of Jupiter, is suggested, utilizing discrete lines in the H2(+) 2p pi u - /s sigma g electronic transition. For the Jovian atmosphere, the dominant mechanism for exciting H2(+) to its 2p pi u state appears to be photoexcitation, principally through absorption of the solar Lyman-alpha line. The critical role of corrections to the Born-Oppenheimer approximation in the use of an H2(+) probe is discussed.
    Keywords: SPACE SCIENCES
    Type: Icarus; 22; June 197
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  • 51
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    Models of the giant planets (1974)
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    Publication Date: 2011-08-16
    Description: Models of the giant planets were constructed based on the assumption that the hydrogen to helium ratio is solar in these planets. This assumption, together with arguments about the condensation sequence in the primitive solar nebula, yields models with a central core of rock and possibly ice surrounded by an envelope of hydrogen, helium, methane, ammonia, and water. These last three volatiles many be individually enhanced due to condensation at the period of core formation. Jupiter was found to have a core of about 40 earth masses and a water enhancement in the atmosphere of about 7.5 times the solar value. Saturn was found to have a core of 20 earth masses and a water enhancement in the atmosphere of about 25 times the solar value. Rock plus ice constitute 75-85% of the mass of Uranus and Neptune.
    Keywords: SPACE SCIENCES
    Type: Icarus; 22; June 197
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    Stellar interferometer for figure sensing of orbiting astronomical telescopes (1974)
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    Publication Date: 2011-08-16
    Description: An interferometric device designed to be located in the focal plane of a large astronomical telescope is presented. The prime application is for the forthcoming large space telescope. The device is to perform interferometry on the optical wavefront arising from a single star after it has propagated through the telescope. The concept of a focal plane figure sensor has been experimentally verified by fabricating and testing an operating laboratory breadboard figure sensor. A set of linear independent control equations are derived that define the operations for utilizing a focal plane figure sensor in the control loops for the positioning of the secondary mirror and for the active control of the primary mirror optical figure. A number of scientific experiments that could be performed with the interferometer are also briefly discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 13; Aug. 197
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  • 53
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    Raman scattering applied to hypersonic air flow (1974)
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    Publication Date: 2011-08-16
    Description: The Raman scattering technique was applied to measure the local static temperature and gas number density over a sharp-edge flat-plate model in a Mach 5 nozzle of the Langley nozzle test chamber with air as the test gas. The angle of attack varied from -5 to 15 deg, and the stagnation temperature varied from 317 to 442 K, with stagnation pressures ranging from 170 kN to 2.8 MN/sq m. The measured values of static temperature and density ranged from 60 to 100 K and from 0.03 to 0.8 kg/cu m, respectively. A comparison with calculated values based on static pressure measurements along the model shows that the Raman scattering technique is a viable measurement method in applications to high-speed three-dimensional flows.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA Journal; 12; Aug. 197
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  • 54
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    Roche limit of a solid body (1974)
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    Publication Date: 2011-08-16
    Description: Tidal fission of both impacting and orbiting linear elastic solid bodies based on Kelvin's theory of earth tides is considered. It is shown that there can be more than one mutually exclusive modes of fracture - the particular mode in which a body fractures depending on its size and strength. The analysis gives a vivid picture of the propagation of the fracture with a decreasing distance from the planet. Expressions for the initiation and completion of fracture are obtained which are displayed graphically for a rigid body. The effect of elasticity on the breakup altitude is discussed. For orbiting solid bodies, the study gives the upper limit of the breakup altitude as 0.38R (where R is the radius of planet), which is much less than the value 1.44R used for such bodies in the past. The results presented include a previously given theory by Sekiguchi as a part. For the special case of a liquid body, comparison is made with Roche's calculation and the difference explained.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 191; July 15
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  • 55
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    Energy source for comet outbursts (1974)
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    Publication Date: 2011-08-16
    Description: Development of a mechanism explaining the internal source of energy of comet outbursts. A mechanism is proposed which automatically provides a source of particulate matter which creates a huge surface area which contains a substantial percentage of amorphous ice, so that the phase transition of the amorphous ice to a cubic structure provides a release of energy which may be responsible for the outbursts observed in many comets. In addition, the volume into which the transition can propagate is estimated for a spherical comet with a radius of 5 km.
    Keywords: SPACE SCIENCES
    Type: Nature; 250; July 26
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  • 56
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    On Jupiter's rate of rotation (1974)
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    Description: It is suggested that the apparent lag of Jupiter's mean rotation rate in extratropical latitudes (System II) behind the rotation rate of Jupiter's radio emissions (System III) is caused by the difference between phase speeds and true speeds in extratropical latitudes. An estimate of the difference based on the formula for the phase speed of Rossby waves agrees with the difference calculated from the two rotation rates.
    Keywords: SPACE SCIENCES
    Type: Journal of the Atmospheric Sciences; 31; July 197
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    350-micron mapping of the Orion molecular cloud (1974)
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    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 191; July 1
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  • 58
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    Neutron propagation and 2.2 MeV gamma-ray line production in the solar atmosphere (1974)
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    Publication Date: 2011-08-16
    Description: Calculation of the 2.2-MeV gamma-ray line intensity from the sun using a Monte Carlo method for neutron propagation in the solar atmosphere. Detailed results are provided concerning the total gamma-ray yield per neutron and the time profile of the 2.2-MeV line from an instantaneous and monoenergetic neutron source. The parameters which have the most significant effects on the line intensity are the energies of the neutrons, the position of the neutron source on the sun, and the abundance of He-3 in the photosphere. For an isotropic neutron source which is not too close to the limb of the sun, the gamma-ray yield is between about 0.02 to 0.2 photons per neutron, provided that the neutron energies are in the range from 1 to 100 MeV and the ratio He-3/H is less than about .00005.
    Keywords: SPACE SCIENCES
    Type: Solar Physics; 36; May 1974
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  • 59
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    The atmosphere of Titan (1974)
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    Publication Date: 2011-08-16
    Description: Review of the currently available knowledge on Titan's atmosphere, based on the report of the 1973 Titan Atmosphere Workshop. The atmosphere composition, clouds, haze, and thermal structure are discussed, along with the photochemistry, escape, and recycling of the atmosphere.
    Keywords: SPACE SCIENCES
    Type: Icarus; 22; May 1974
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    Interstellar scattering of the Vela pulsar (1974)
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    Publication Date: 2011-08-16
    Description: The frequency dependence of the parameters of interstellar scattering between 837 and 8085 MHz for the Vela pulsar are consistent with thin-screen models of strong scattering. The magnitudes of the parameters indicate an anomalous turbulence along the path when they are compared with results for other pulsars with comparable column densities of free electrons in the line of sight. This anomaly is due presumably to the Gum Nebula. The decorrelation frequency, appropriately defined, is related to the pulse broadening time by 2 pi as predicted theoretically.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 190; June 15
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    The response of a propeller anemometer to turbulent flow with the mean wind vector perpendicular to the axis of rotation (1974)
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    Publication Date: 2011-08-16
    Description: Determination of the properties of the system transfer function of the vertical-velocity propeller anemometer. A treatment of this problem is presented which is based on an analysis of estimates of the system transfer function derived from estimates of spectra calculated from time histories of indicated vertical velocity and on estimates of the associated input Eulerian vertical-velocity frequency spectra based on the hypothesis that instrument degradation of the Fourier components occurs in the inertial subrange.
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    Type: Boundary-Layer Meteorology; 6; May-June
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    Infrared observations of Phobos from Mariner 9 (1974)
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    Description: Radiometric measurements of Phobos at 10 and 20 microns show that the surface is covered by a material whose conductivity is extremely low, around .000001 cal per cm per sec per deg K. It is concluded that Phobos is covered with a layer of dust at least 1 mm thick.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 190; June 1
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    Jupiter's clouds - Equatorial plumes and other cloud forms in the Pioneer 10 images (1974)
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    Description: The imaging photopolarimeter experiment aboard the Pioneer 10 spacecraft produced two-dimensional maps of intensity and polarization in red and blue light at high resolution during flyby of Jupiter in December 1973. The present article describes cloud forms seen in the equatorial zone and compares them with rotational periods as a function of latitude derived from earth-based observations of features on Jupiter. A striking new feature consists of a bright, well-defined nucleus in the equatorial zone, with a plume apparently drawn out from the core of the nucleus.
    Keywords: SPACE SCIENCES
    Type: Science; 184; June 21
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    Astronomical demonstration of an infrared upconverter (1974)
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    Description: An upconverter has been used to convert infrared photons from astronomical sources to higher frequency quanta that were detected with a pulse-counting photomultiplier photometer. It is pointed out that these observations represent the first successful astronomical demonstration of infrared upconversion. Upconversion is carried out in an optically nonlinear medium, which in the upconverter described is a lithium iodate crystal. A 0.6943-micrometer high peak power ruby laser pump was developed for the demonstration.
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    Type: Nature; 249; June 14
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    An autoranging scanning system and compatible methods of noise reduction (1974)
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    Description: The autoranging scanning system discussed combines in a unique way four different methods for removing noise. The system employs a narrow-band amplifier. Other noise reduction methods make use of digital summation, convolution numbers, and the coaddition of scans. The system was designed to digitize the output of an infrared spectrometer and to record it on magnetic tape. Light passes through a mechanical light chopper and the spectrometer optics, and falls on the PbS cell to produce a signal which is amplified by the first preamplifier.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 45; July 197
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    Convection in the moon - Effect of variable viscosity (1974)
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    Description: This work determines criteria for stability of the lunar interior to thermal convection in the case of variable viscosity. The conditions necessary for solid convection to play an important role in the moon's revolution are determined by application of the calculated stability criteria to a variety of thermal history models. Most thermal history temperature profiles would be unstable to solid convection at the present time, if currently used estimates of the viscosity function are applicable. A possible explanation of lunar seismic data is that temperatures near the melting point of silicates exist at depths greater than 800 km. If this is the case, either the lunar interior is stable, or solid convection is occurring at a rate insufficient to cool the lunar interior substantially. If the former is true, the viscosity of lunar material is higher than that usually assumed.
    Keywords: SPACE SCIENCES
    Type: Journal of Geophysical Research; 79; July 10
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    Mathematical operations by optical processing (1974)
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    Description: Some recent developments in coherent optical processing are described in this paper. Specifically, the use of one or more elementary gratings to perform useful processing operations and computer-generated spatial filters to obtain generalized transforms are discussed. Applications incorporating nonlinear optical elements and optical feedback into the processing system are also presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Engineering; 13; May-June
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    Thermophysical properties of lunar media. II - Heat transfer within the lunar surface layer (1974)
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    Description: Heat transfer within the lunar surface layer depends on several thermophysical properties of the lunar regolith, including the thermal conductivity, the specific heat, the thermal diffusivity, and the thermal parameter. Results of property measurements on simulated lunar materials are presented where appropriate as well as measurements made on the actual samples themselves. The variation of temperature on the moon with depth is considered, taking into account various times of the lunar day. The daily variation in temperature drops to about 1 deg at a depth of only 0.172 meters. The steady temperature on the moon below this depth is 225 K.
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    Behaviour of comet Kohoutek /1973f/ (1974)
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    Publication Date: 2011-08-16
    Description: The spectral identification of CH3CN and HCN provides the first support for the hypothesis first proposed by Wurm (1943), of chemically stable 'parent molecules' for the less stable radicals and ions seen in the coma and the tail. These two molecules were among the earliest discovered in dense interstellar clouds. Circumstantial evidence for the presence of water as the dominant volatile component in the nucleus has been growing for some time. However, a much more volatile species is required to explain the observed behavior of the comet. CO, formaldehyde, or methane would quickly evaporate as the comet approached the sun.
    Keywords: SPACE SCIENCES
    Type: Nature; 249; June 7
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  • 70
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    One- and multi-component models of the upper photosphere based on molecular spectra. II - CN/1, 1/ of the CN violet system (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: Solar Physics; 35; Apr. 197
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  • 71
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    Hydrogen ionization in the shock layer for entry into the outer planets (1974)
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    Publication Date: 2011-08-16
    Description: Approximate assessments are presented for the chemical state of the shock layer with respect to the hydrogen ionization reaction for representative entries into Saturn, Uranus, and Jupiter. It is shown that, except for a steep entry into the Saturn nominal atmosphere, the computation of all entry probe gascaps for the outer planets can probably be considered on either a frozen or chemical equilibrium basis.
    Keywords: SPACE SCIENCES
    Type: AIAA Journal; 12; June 197
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  • 72
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    A ten-day observation of Hercules X-1 from the OSO-7 satellite (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The MIT X-ray detectors aboard the OSO-7 spacecraft viewed Hercules X-1 from November 14 to 24, 1972. X-ray turn-on in the 35-day cycle was observed to occur between phases 0.67 and 0.70 (November 18.64-18.70). A significant decrease in the X-ray intensity occurred near mid-orbital phase, approximately 1.5 days after X-ray turn-on. Using the 1-6 keV data obtained during the 35-day off state, we conclude that if the optical light curve is due to heating of the large star by a blackbody source of soft X-rays, then the source must be large (radius greater than 5,000 km) and cool (temperature (kT) less than 90 eV). During one eclipse period (November 20.8-21.0) we find evidence for 1-6 keV X-ray emission.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 188; Feb. 15
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  • 73
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    Depletion of interstellar sodium and calcium (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: New measurements of the Ca II/Ca I ratios in interstellar clouds lead to the conclusion that not only Ca, but also Na, is underabundant in these regions. Recent calculations of element depletion by accretion of atoms onto dust grains probably cannot account for the observed abundance range. The extreme underabundance of Ca, and some part of the abundance range, probably reflect the composition of the grain cores.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 187; Feb. 1
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  • 74
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    Millisecond temporal structure in Cygnus X-1 (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 189; Apr. 1
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  • 75
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    Statistical time-dependent model for the interstellar gas (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: We present models for temperature and ionization structure of low, uniform-density (approximately 0.3 per cu cm) interstellar gas in a galactic disk which is exposed to soft X rays from supernova outbursts occurring randomly in space and time. The structure was calculated by computing the time record of temperature and ionization at a given point by Monte Carlo simulation. The calculation yields probability distribution functions for ionized fraction, temperature, and their various observable moments. These time-dependent models predict a bimodal temperature distribution of the gas that agrees with various observations. Cold regions in the low-density gas may have the appearance of clouds in 21-cm absorption. The time-dependent model, in contrast to the steady-state model, predicts large fluctuations in ionization rate and the existence of cold (approximately 30 K), ionized (ionized fraction equal to about 0.1) regions.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 189; Apr. 1
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  • 76
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    Magnetic remanence mechanisms in iron and iron-nickel alloys, metallographic recognition criteria and implications for lunar sample research (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: The Moon; 9; Mar
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  • 77
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    Laboratory simulation of the herringbone pattern associated with lunar secondary crater chains (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: V-shaped ridge components of the herringbone pattern associated with lunar secondary crater chains have been simulated by simultaneous and nearly simultaneous impact of two projectiles near one another. The impact velocities and angles of the projectiles were similar to those of the fragments that produced secondary craters found at various ranges from large lunar craters. Variables found to affect the included angles of the V-shaped ridges are: relative time of impact of the projectiles, impact angle, relative projectile mass, and azimuth angle of the crater chain relative to the projection of the flight line onto the target surface. The functional relationships between the forms of the ridges and many of these variables are similar to those observed for lunar V-shaped ridges. Comparison of the magnitudes of the ridge angles of both laboratory crater pairs and secondary crater chains of the crater Copernicus implies that material was ejected from Copernicus at angles in excess of 60 deg, measured from the normal, to form many of Copernicus' satellite craters.
    Keywords: SPACE SCIENCES
    Type: The Moon; 9; Mar
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  • 78
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    Possible lunar ring dikes (1974)
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    Publication Date: 2011-08-16
    Description: A search for lunar features that showed characteristics of terrestrial ring dikes was conducted, using the Lunar Orbiter series of photographs. Features exhibiting one or more of the following four criteria were included as lunar analogs to terrestrial ring dikes: (1) inner ridges approximately concentric with the crater wall, (2) inner rills approximately concentric with the crater wall, (3) outer ridges and/or rills approximately concentric with the crater wall, and (4) interior and exterior slopes of the crater wall approximately equal. Features exhibiting each of the four criteria were found, and some had combinations of two or more including rills merging into ridges - e.g., in Taruntius and Posidonius. Gambart is an example of equal inner and outer slopes, while Hesiodus A and Marth are two of the best examples of complete inner rings concentric with the outer rings. Ten per cent of the candidates were probable impact craters but had subsequent volcanic activity of a ring dike nature. The initial search showed a distribution of the possible lunar ring dikes that was nonrandom and strongly associated with the margins of the maria, further implying that they are volcanic features.
    Keywords: SPACE SCIENCES
    Type: The Moon; 9; Mar
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  • 79
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    Turbulence measurements in a Mach 2.9 boundary layer using laser velocimetry (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Measurements taken in a Mach-2.9 turbulent boundary layer are shown to demonstrate the ability of a laser velocimeter to measure the turbulence transport properties of high-speed compressible flows. This demonstrated ability, combined with the nonperturbing quality and relative insensitivity to environmental conditions of the laser velocimeter, opens the way to compressible flow measurements never considered possible with more conventional measurement techniques.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA Journal; 12; May 1974
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  • 80
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    The nature of microturbulence in the solar photosphere (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: It is shown that the increase in apparent Doppler width as the limb is approached is a natural consequence of the fact that the solar atmosphere is not homogeneous. The work on the sodium D line cores which assumes the solar atmosphere to be homogeneous is reviewed. It appears that the cores of the sodium D lines have been distorted by fluctuations in the solar atmosphere in a systematic manner. It is concluded that the increase in apparent Doppler width observed in the sodium D line is a natural consequence of the temperature fluctuations in the solar atmosphere. The presence of a velocity field is not required to produce this effect.
    Keywords: SPACE SCIENCES
    Type: Royal Astronomical Society; vol. 166
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  • 81
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    Two new physical processes in the far-ultraviolet spectrum of zeta Tauri (1974)
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    Publication Date: 2011-08-16
    Description: We have detected absorption features in the far-ultraviolet spectrum of zeta Tau (B3pe), one of which corresponds to a new transition involving quasi-H/-/, and the other to a transition involving quasi-H2/+/. The former transition produces a broad absorption feature on the red wing of L-alpha. It is the result of the absorption of a photon by a ground-state hydrogen atom and colliding electron, and it leads to the excitation of both electrons to the 2p2 3Pe state of H/-/.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 187; Jan. 1
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  • 82
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    Detection and elimination of reflections in beam-foil target chambers (1974)
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    Publication Date: 2011-08-16
    Description: Description of techniques for detecting and reducing to negligible values beam-radiation reflection and scattering in high vacuum target chambers used in beam foil experiments. It is suggested that all target chambers be checked in the manner described in order to discover and reduce intensity variations that may not be obvious on the usual beam-foil decay curves.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 13; June 197
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  • 83
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    Atmosphere of Venus: Implications of Venera 8 sunlight measurements (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Venera 8 measurements of solar illumination within the atmosphere of Venus are quantitatively analyzed by using a multilayer model atmosphere. The analysis shows that there are at least three different scattering layers in the atmosphere of Venus and the total cloud optical thickness is about 10 or greater. However, because of the nature of the observations, it is not possible to determine the vertical distribution of absorbed solar energy, which would reveal the drive for the atmospheric dynamics and the strength of the greenhouse effect. Future spacecraft observations should be designed to (1) measure both upward and downward solar fluxes, (2) include measurements of the highest cloud layers, and (3) employ narrow-band and broad-band sensors.-
    Keywords: SPACE SCIENCES
    Type: Science; 184; May 31
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  • 84
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    Profiles of emission lines in Be stars. III (1974)
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    Publication Date: 2011-08-16
    Description: The long-period V/R emission variations in three Be stars, HD 20336, 25 Ori, and beta-one Mon have been studied according to the mathematical formulation of the eccentric rotating model presented in a previous paper. The predictions of the theory fit satisfactorily the general trend of observed data. Periods, eccentricities, and sizes of the emitting ring with respect to the stellar radius are thereby derived and found to be consistent with results of the previous investigation of 105 Tauri.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 189; May 1
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  • 85
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    The local complex of O and B stars. I - Distribution of stars and interstellar dust (1974)
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    Publication Date: 2011-08-16
    Description: The O-B5 stars, supergiants, young clusters, and associations within 1 kpc of the sun populate two flat systems inclined to each other by 19 to 22 deg. The historical background, statistical significance, composition, spatial arrangement of the contents, and interstellar extinction in the two belts are discussed. A more or less random distribution in space and in age characterizes the O-B5 stars of the 'galactic belt', which is aligned nearly along the Milky Way. The 'Gould belt' is inclined to the Milky Way (north in Sco-Oph and south in Orion), and exhibits a projected distribution of O-B5 stars in its mean plane that resembles a 'dragonfly', with five major features defining it. A crude 'diameter' of the system is 750 to 1000 pc, and the sun's position is eccentric, lying toward Ophiuchus. The nuclear age of the system, while not unique, may be characterized as 30 m.y. from the spectral type of the broad main-sequence turnup near B2-5. Most of the O-B2 stars and youngest stellar groups near the sun belong to the Gould belt, but both belts have approximately equal space densities of B3-B5 stars and similar average values of interstellar extinction.-
    Keywords: SPACE SCIENCES
    Type: Astronomical Journal; 79; Apr. 197
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  • 86
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    Solar coronal line profiles in the extreme-ultraviolet (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 189; Apr. 1
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  • 87
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    Galactic arm structure and gamma-ray astronomy (1974)
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    Publication Date: 2011-08-16
    Description: In an attempt to explain the observed unexpectedly high-energy gamma-radiation over a broad region of the galactic plane in the general direction of the galactic center, a model is proposed wherein the galactic cosmic rays are preferentially located in the high-matter-density regions of galactic arm segments, as a result of the weight of the matter in these arms tying the magnetic fields and hence the cosmic rays to these regions. The presently observed longitudinal distribution of galactic gamma-rays can be explained with the current estimate of the average galactic matter density, if the average ratio of arm to interarm matter is 5:1 for the major arm segments toward the galactic center from the sun, and if the cosmic-ray density normalized to its local value is assumed to be directly proportional to the matter density.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 189; Apr. 15
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  • 88
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    The atmosphere of Mars (1974)
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    Publication Date: 2011-08-16
    Description: The atmosphere of Mars is essentially a pure carbon dioxide atmosphere that contains a small and seasonably varying amount of water vapor. A number of minor constituents which arise from the interactions of solar radiation with water vapor and carbon dioxide include carbon monoxide, atomic oxygen, molecular oxygen, ozone, and atomic hydrogen. At the surface of Mars the atmospheric pressure is less than one hundredth of the pressure at the surface of the earth. Extensive cloud systems appear on Mars. The structure of the lower Martian atmosphere is discussed together with variations in the lower atmosphere and the characteristics of the upper atmosphere. Reactions of photochemistry are considered along with the atmospheric escape and interactions between the atmosphere and the polar caps.
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  • 89
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    Modified Brans-Dicke gravitational theory with nonzero divergence of the energy-momentum tensor (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The Brans-Dicke theory of gravitation is modified by assuming that the divergence of the energy-momentum tensor is proportional to the covariant derivative of the scalar curvature. No ad hoc additions to the usual Brans-Dicke field equations are required as in Rastall's modification of the Einstein theory or as in the steady-state theories, of which this is a natural possibility. Three parameters emerge from the theory - namely, the unnormalized gravitational constant, the usual Brans-Dicke parameter, and the proportionality constant. In the post-Newtonian approximation, these parameters can be fixed by experiment. However, there exists a certain choice of the parameters for which the theory reduces to an Einstein theory with constant scalar curvature.
    Keywords: SPACE SCIENCES
    Type: Physical Review D - Particles and Fields; vol. 9
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  • 90
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    Correlation between region of enhanced mare flooding on the lunar farside and Apollo orbital results (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: The Moon; 9; Mar
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  • 91
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    Square-root algorithm for evaluating mismodeled process noise (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: As the application of sequential filters has grown, the need has arisen to evaluate the sensitivity of these filters to mismodeling of the random process. A numerically reliable square-root algorithm is developed for calculating the covariances of estimates from a sequential filter which incorrectly models process noise. Mismodeling is restricted to the correlation time and standard deviation of a random process represented as a first-order Gauss-Markov sequence. Using a computer program which employs this algorithm, a sensitivity analysis was performed for several types of earth-based tracking data from an interplanetary spacecraft.
    Keywords: SPACE SCIENCES
    Type: Journal of Spacecraft and Rockets; 11; Apr. 197
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  • 92
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    On the mass determination of collapsed objects in close binaries - Applications to black-holes and neutron stars (1974)
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    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: Astrophysics and Space Science; 27; Apr. 197
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  • 93
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    Multiplex imaging with multiple-pinhole cameras (1974)
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    Publication Date: 2011-08-16
    Description: When making photographs in X rays or gamma rays with a multiple-pinhole camera, the individual images of an extended object such as the sun may be allowed to overlap. Then the situation is in many ways analogous to that in a multiplexing device such as a Fourier spectroscope. Some advantages and problems arising with such use of the camera are discussed, and expressions are derived to describe the relative efficacy of three exposure/postprocessing schemes using multiple-pinhole cameras.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Applied Physics; 45; Apr. 197
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  • 94
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    Evidence about hydrate and solid water in the Martian surface from the 1969 Mariner infrared spectrometer (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Results of laboratory simulation studies and comparative computer analyses of infrared spectral data regarding the presence, distribution, and form of condensed-phase water in the Martian surface. The data were obtained with the aid of the Mariner 6 and 7 spacecraft which were equipped with infrared spectrometers recording the infrared spectrum from 1.9 to 14.4 microns. From the analysis of these data evidence is obtained which signifies some sort of compositional and/or particle size variability of the extent and nature of hydration. Changes are noted which could be due to ice thinly covering a small fraction of the planetary surface in particularly cold spots, possibly on partially shaded slopes. At southerly latitudes, the fraction so covered seems to increase as the polar cap edge is approached. It is therefore concluded that there is strong evidence of ice formation on the planetary surface at the edge of the polar cap.
    Keywords: SPACE SCIENCES
    Type: Journal of Geophysical Research; 79; Apr. 10
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  • 95
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    Mariner 10 pictures of Mercury - First results (1974)
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    Publication Date: 2011-08-16
    Description: Mercury has a heavily cratered surface containing basins up to at least 1300 kilometers diameter flooded with mare-like material. Many features are closely similar to those on the moon, but significant structural differences exist. Major chemical differentiation before termination of accretion is implied.
    Keywords: SPACE SCIENCES
    Type: Science; 184; Apr. 26
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  • 96
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    The Toulon meteorite - A new chondrite from Illinois (1974)
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    Publication Date: 2011-08-16
    Description: Toulon is an olivine-bronzite chondrite found near Toulon, Illinois in 1962. It contains abundant, well preserved chondrules, as well as glasses that are not well devitrified. Most of the metal has been weathered out. Olivine and pyroxene are well equilibrated. It has been classified as an H5 chondrite.
    Keywords: SPACE SCIENCES
    Type: Meteoritics; 9; Mar. 30
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  • 97
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    Photometry of Comet Kohoutek /1973f/ (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Data are reported which provide the first large, homogeneous set of photoelectric and infrared photometry obtained for any comet. Assuming an albedo of 0.5 (a high albedo is assumed because of the large ratio of gas to dust in Kohoutek), the diameter of the nucleus of the comet is estimated to be 10 to 15 km. Based on a comparison with the infrared spectrum of Comet Bennett, it was calculated that the latter had about 16 times as much dust as Kohoutek. The data are used to obtain an evaluation of O'Dell's (1971) expression for the albedo of cometary dust grains in terms of the integrated infrared surface brightness and the surface brightness of scattered light in the continuum.
    Keywords: SPACE SCIENCES
    Type: Nature; 248; Apr. 26
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  • 98
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    Creation of an artificial lunar atmosphere (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: It is pointed out that the tenuous nature of the lunar atmosphere is maintained by rapid loss of gases released at the lunar surface. The loss of gases from the lunar atmosphere in the case of a greatly increased atmospheric density is investigated. It is found that in the case of such an increase in the density of the lunar atmosphere, a point can be reached where loss occurs so slowly that it is negligible over human time scales. In the event an artificial lunar atmosphere were to be created, gases can be obtained by heating or vaporization of the lunar soil. This could be done with the aid of nuclear devices.
    Keywords: SPACE SCIENCES
    Type: Nature; 248; Apr. 19
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  • 99
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    The galloping chromosphere (1974)
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    Publication Date: 2011-08-16
    Description: Oscillating velocity fields can be observed on H-alpha filtergrams as a shifting pattern of intensity fluctuations known as 'the galloping chromosphere'. The characteristics of this activity are those of horizontal running waves of typical period of about 300 sec and long wavelength (about 20,000 km) that can be interpreted as acoustic-gravity waves propagating in the acoustic domain. Periods are longer in dark, structured regions, and in fibrils, and the change is quantitatively consistent with the reduction of resonance frequency in a magnetic field of 1 to 10 gauss. These easily observed fluctuations thus offer a means of estimating magnetic-field strength at specific locations in the chromosphere. Phase velocities are high, ranging upward from typical values between 50 and 100 km per sec, and tending to be lower in active regions and toward the limb.
    Keywords: SPACE SCIENCES
    Type: Solar Physics; 35; Mar. 197
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  • 100
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    Minor planets and related objects. XV - Asteroid /1620/ Geographos (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Analysis of the light curves and color-phase and polarization-phase relations of Geographos according to observations over an eight-month period in 1969. The light curves are relatively smooth with two distinct maxima and minima. The largest amplitude of 2.03 mag is the largest observed on asteroids to date. The average B-V is 0.87 and the average U-B is 0.50. A laboratory model that best reproduced Geographos' light curves was a cylinder having hemispherical ends with a length to width ratio of 2.7; on the basis of this model and a relation of Bowell and Zellner (1973), Geographos was calculated to be approximately 1.50 km wide and 4.0 km long.
    Keywords: SPACE SCIENCES
    Type: Astronomical Journal; 79; Feb. 197
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