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  • Other Sources  (3,851)
  • SPACE VEHICLES  (2,693)
  • PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR  (1,158)
  • 1970-1974  (3,851)
  • 1950-1954
  • 1925-1929
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  • Other Sources  (3,851)
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  • 1
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    Architecture in outer space (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Mulilayer thin film structures consisting of systems of shells filled with gas at some pressure are recommended for outer space structures: Large mirrors to collect light and radio waves, protection against meteoric impact and damage, and for connectors between state space stations in the form of orbital rings. It is projected that individual orbital rings will multiply and completely seal a star trapping its high temperature radiation and transforming it into low temperature infrared and short wave radio emission; this radiation energy could be utilized for technological and biological processes.
    Keywords: SPACE VEHICLES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 161-169
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  • 2
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    Spacecraft of the future (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Manned interstellar expeditions require future ion propulsion rocket engines able to achieve a flight velocity of 0.3 times the speed of light, and a closed ecological system onboard the interstellar spacecraft that incorporates biological links and complicated technical facilities to insure long term life support for its crew.
    Keywords: SPACE VEHICLES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 135-153
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  • 3
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    Spacecraft (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The task of building a spacecraft is compared to the construction of an artificial cybernetic system able to acquire and process information. Typical features for future spacecraft are outlined and the assignment of duties in spacecraft control between automatic devices and the crew is analyzed.
    Keywords: SPACE VEHICLES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 2-16
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  • 4
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    Proton-deuteron double scattering (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A simple but accurate form for the proton-deuteron elastic double scattering amplitude, which includes both projectile and target recoil motion and is applicable at all momentum transfer, is derived by taking advantage of the restricted range of Fermi momentum allowed by the deuteron wave function. This amplitude can be directly compared to approximations which have neglected target recoil or are limited to small momentum transfer; the target recoil and large momentum transfer effects are evaluated explicitly within the context of a Gaussian model.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review C - Nuclear Physics; vol. 10
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  • 5
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    Characterization of charge states of energetic ions in solids from associated K X-ray production (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The strong projectile-charge-state dependence of K X-ray production in gases establishes a charge-state scale for ions penetrating solids. Si K X-ray cross sections in gaseous SiH4 were compared to those in solid Si for 40-MeV O (6+ to 8+) and 86-MeV Ar (6+ to 16+) projectiles. For Ar an effective charge of 11 plus or minus one is found compared to an emergent charge of 14.8 plus or minus 0.5. The result is discussed in terms of alternate models for steady-state excitation in solids.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review Letters; 33; Sept. 23
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  • 6
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    Measurements of sonic-boom overpressures from Apollo space vehicles (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: This paper presents representative results of sonic-boom overpressure data recorded during the launch and reentry of the Apollo 15 and 16 space vehicle systems. Comparisons are made between measured overpressures and those predicted using available theory. The measurements were obtained along the vehicle ground track at 68, 87, 92, 129, and 970 km downrange from the launch site during ascent, and at 9, 13, 55, 185, and 500 km from the splash-down point during reentry. Also included are tracings of the sonic-boom signatures along with a brief description of the launch and recovery test areas in which the measurements were obtained, the sonic-boom instrumentation deployment, flight profiles and operating conditions, and high-altitude weather information for the general measurement areas.
    Keywords: SPACE VEHICLES
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  • 7
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    The community satellite 1 (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: NASA's Applications Technology Satellite-6 is being used to test a variety of new space communications concepts requiring the use of a geosynchronous-orbit spacecraft. These include broadcast of health and education television programs to small, low-cost ground receiving units in remote regions. Other studies to be conducted are related to aeronautical and maritime communications, position-location, and traffic-control techniques. Questions concerning spacecraft tracking and data relay are also investigated. The 1,402 kg spacecraft consists essentially of an Earth Viewing Module connected to a deployable reflector antenna. Details regarding the planned experiments and the spacecraft design are discussed and a brief history of the ATS program is presented.
    Keywords: SPACE VEHICLES
    Type: Spaceflight; 16; Sept
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  • 8
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    Spin projection of single-determinant wavefunctions (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The components of the one- and two-particle density matrices resulting from spin projection of a single-determinant wave function are rederived by the method of expansion in terms of the natural orbitals of charge density, and the results are found to diverge from those given by Harriman and Sando for the two-particle case. The theory is generalized to include molecules with unequal numbers of electrons and basis orbitals and is applied to a number of organic molecules and ions. The correctness and internal consistency of the results argue in favor of the modification described.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 61; Aug. 1
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  • 9
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    New interferometric observations of Ar I in the photographic region (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Optical Society of America; vol. 64
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  • 10
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    Development of large earth orbital space station (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: This paper outlines the major aspects of the development of large earth orbital space stations. At the outset, the uses of the space station are surveyed and the major systems and configurational drivers enumerated. A representative 12-man space station, studied by the Space Division of North American Rockwell Corporation under NASA contract is described. The subsequent discussion centers around earth-to-orbit logistics and possible future missions with emphasis on the establishment of a branch station geosynchronous orbit. In dealing with the associated transportation between low and high orbits, the concept of a geospace shuttle station oscillating between near-earth and synchronous orbit is compared with conventional shuttle vehicles with chemical and nuclear propulsion. In the final part, the evolution of the 12-man space station to a larger space base is described.
    Keywords: SPACE VEHICLES
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  • 11
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    Relative cross section and depolarization of NOCl (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A standard photon counting technique and an argon-ion laser with 4545, 4579, 4727, 4765, 4880, 4965, 5017 and 5145-A lasing lines, providing a measurable Raman spectrum from NOCl, were used in the measurement of the Raman scattering cross section of NOCl at a Raman shift of 334.4 plus or minus 1.6/cm in relation to the N2 Raman cross section. A polarization analyzer and a quartz wedge were placed in front of the entrance slit of the double monochromator for depolarization measurements. Diagrams are plotted to show the scattering cross section and depolarization measurement results.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Applied Physics Letters; 25; Aug. 15
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  • 12
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    Addendum to 'Autoionization states in He and H/-/ by the stabilization method' (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The positions of the resonances calculated by the stabilization method can be improved by inclusion of the shift as given by Hazi and Fels. It is also indicated that the phase shifts calculated by the Harris method at incident energies corresponding to the stabilized roots give the positions and the widths of the resonances reasonably well.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 10
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  • 13
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    Differential cross sections for electron impact ionization of helium (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 10
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  • 14
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    Electron avalanche in liquid xenon (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Measurements in liquid Xe are reported of the characteristic function that describes the avalanche, the first Townsend coefficient. An electron avalanche occurs when the drifting electrons attain sufficient kinetic energy from the electric field to cause additional ionization. Data on the avalanche were obtained by studying the pulses in a liquid-filled proportional chamber as a function of applied voltage and anode diameter. The results of the investigation show that the avalanche of free electrons in purified liquid Xe is adequately described by the same formalism used for the avalanche of electrons in gases.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 15
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    Dipole and quadrupole integrals for the C I, N I, and O I sequences (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The Coulomb approximation tables of Oertel and Shomo, together with binding-energy values obtained by a screening approximation, have been used to produce values of the dipole and quadrupole radial integrals needed in obtaining transition probabilities for ions of six, seven, and eight electrons. Some comparisons with more rigorously calculated values show that the present values are quite accurate, especially for ions of higher atomic number.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: vol. 27; Mar. 197
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  • 16
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    Quadrupole moment of CO, N2, and NO/+/ (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Evaluation of quadrupole moments obtained for CO, N2, and NO(+) with multiconfiguration self-consistent-field wave functions chosen by the optimized valence configuration (OVC) approach of Wahl and Das (1972). The quadrupole moments thus obtained are compared with both experimental and Hartree-Fock values. The Hartree-Fock results are found to be not very accurate for N2, especially if vibrational averages over vibrational levels greater than 1 or 2 are to be taken. The agreement between the OVC quadrupole moment and the experimental values is found to be best for CO.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 60; Apr. 1
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  • 17
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    Crystallization of dense neutron matter (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The equation of state for cold neutron matter at high density is studied in the t-matrix formulation, and it is shown that energetically it is convenient to have neutrons in a crystalline configuration rather than in a liquid state for values of the density exceeding 1600 Tg/cu cm. The study of the mechanical properties indicates that the system is stable against shearing stresses. A solid core in the deep interior of heavy neutron stars appears to offer the most plausible explanation of speed-ups observed in the Vela pulsar.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review D - Particles and Fields; vol. 9
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  • 18
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    /p, t/ reactions on odd-A nuclei and the weak-coupling core-excitation model (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physics Letters; 49B; Apr. 1
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  • 19
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    Reinvestigation of rotational-line intensity factors in diatomic spectra (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The theory of the intensity factors of rotational lines in diatomic molecular spectra is reviewed with an emphasis on removing obscurities and resolving ambiguities that exist. For example, a unified intensity-factor sum rule is derived that is valid for all spin-allowed and spin-forbidden dipole transitions. Further, it is shown that the electronic transition moments can always be chosen to be real and that a few simple rules ensure the application of consistent phase factors.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: vol. 27; Jan. 197
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  • 20
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    Rigorous precision p-wave positron-hydrogen scattering calculation (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Rigorous lower-bound p-wave positron-hydrogen phase shifts are calculated below the positronium pickup threshold. The wave function is expanded in terms of the two linearly independent D functions each multiplied by an associated Hilleraas-type radial function with two parameters. Adiabatic and nonadiabatic corrections have been included. The results are found to be larger than Armstead's (1968) in all cases near the upper edge of his estimated uncertainty.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 21
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    Angular distributions and polarization fractions of helium resonance radiation /n 1P-1 1S/ in the extreme ultraviolet (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Angular intensity distributions of helium resonance photons, experimentally determined for the first time with respect to the exciting electron beam, are presented. The angular intensity distributions were measured at selected electron-impact energies from 25 to 150 eV. The results obtained are slightly higher than theoretical data for electron impact energies from 80 to 150 eV.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 22
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    Annihilation during positron-hydrogen collisions (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Using the precision s- and p-wave elastic-scattering wave functions obtained previously, we have calculated the annihilation rate for positrons colliding with hydrogen atoms below the positronium-formation threshold. The s-wave results agree well with those of Humberston, while the p-wave results, which are new, contribute about 20% of the total at the higher energies.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 23
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    Photoionization from excited states of helium (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 24
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    Crossed beam study of the reaction O/+/ + N2 yields NO/+/ + N (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The kinematics of the reaction O(+)(4 S) + N2 yields NO(+) + N were studied using crossed molecular beams. Product angular and energy distributions were measured for the initial relative translational energy range from 1.5 to 15.8 eV. The products are formed in their ground electronic states. The product distributions are described, with some deviations, by the spectator stripping model. No evidence was found for a persistent complex or for a second mechanism. A scattering chamber study of 0 deg lab was made of the related reactions 15N(+) + 14NO yields 15N14N(+), 15NO(+), 14NO(+). The results obtained are discussed in terms of possible surface hopping effects.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 60; Mar. 1
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  • 25
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    Measurement of microwave fine structure in OH infrared transitions using frequency mixing with metal to metal infrared diodes (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 60; Feb. 15
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  • 26
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    High-density Stark profiles of two neutral helium lines and their forbidden components (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Measured and calculated profiles are compared for two neutral helium lines, He I (4471 and 6678 A), and their forbidden components at high electron densities. Calculations were done at the measured plasma conditions and are compared directly with the experimental profiles. Good agreement is found between theory and experiment.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 27
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    Autoionization states in He and H/-/ by the stabilization method (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The stabilization method for positions and widths of resonances has been applied up to now only to model problems or to problems for which definitive calculations are not possible. The method is now applied to autoionization states in He and H(-), where accurate calculations are available. It is concluded that reasonably accurate results can be obtained by this method.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 28
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    Space Shuttle - The new baseline (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Recent design alterations and refinements in the Space Shuttle program are considered with particular attention to the present baseline Shuttle configurations, performance characteristics, mission profiles, and flight and ground operations. Hardware and software development and testing, propulsion systems, entry trajectory events, and payload capability are covered. The refined Space Shuttle system design is characterized as one reflecting firm technical and economic considerations. Systems development is well under way, with all major contractors progressing on schedule.
    Keywords: SPACE VEHICLES
    Type: Astronautics and Aeronautics; 12; Jan. 197
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  • 29
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    Stability of a dual-spin satellite with two dampers (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The rotational stability of a dual-spin satellite consisting of a main body and a symmetric rotor, both spinning about a common axis, is investigated. The main body is equipped with a spring-mass damper, while a partially filled viscous ring damper is mounted on the rapidly spinning rotor. The effect of fluid motion on the rotational stability of the satellite is calculated, considering the fluid as a single particle moving in a tube with viscous damping. Time constants are obtained by solving approximate equations of motion for the nutation-synchronous and the spin-synchronous modes, and the results are found to agree well with the numerical integrations of the exact equations. A limit cycle may exist for some configurations; the nutation angle tends to increase in such cases.
    Keywords: SPACE VEHICLES
    Type: Journal of Spacecraft and Rockets; 11; July 197
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  • 30
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    Mars surface-to-orbit vehicles for sample return missions (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Review of the results of a Mars surface-to-orbit launch vehicle study using an upgraded atmospheric density profile and an ascent trajectory optimization program. Orbit insertion was achieved with velocity losses less than those found in an earlier study. Values of thrust-to-mass ratio which minimize velocity losses for dual-burn vehicles were found to be significantly greater than the values of thrust-to-launch-mass ratio for the minimum-velocity-loss continuous-burn vehicle. The use of a two-stage solid-propellant vehicle employing a spin-stabilized second stage offers an attractive design option for a Mars surface-to-orbit launch vehicle.
    Keywords: SPACE VEHICLES
    Type: Journal of Spacecraft and Rockets; 11; June 197
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  • 31
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    Absorption cross sections of stratospheric molecules (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Two classes of molecular species must be considered in a calculation of photochemical rates in the stratosphere. The first class consists of molecular oxygen and ozone, while the second class contains the remainder of the minor constituents. If accurate values of the transmitted fluxes are required at large optical depths, the cross sections for molecular oxygen and ozone must be known to within a few per cent at least. On the other hand, the photochemical rates for the minor species are given simply by the relevant cross sections. A review of published cross sections is presented, giving attention to molecular oxygen, ozone, nitric oxide, nitrogen dioxide, nitrous oxide, nitric acid, ammonia, water vapor, hydrogen peroxide, carbon monoxide, carbon dioxide, and sulfur dioxide.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Canadian Journal of Chemistry; 52; 8, 19; 1974
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  • 32
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    Extreme ultraviolet spectra of highly ionized oxygen and fluorine (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The foil-excitation method has been used to study the extreme ultraviolet spectra of highly ionized oxygen and fluorine. Several previously unreported lines in heliumlike fluorine are reported and other newly reported lines in heliumlike oxygen have been measured to higher accuracy. Included in the measurements are certain heliumlike oxygen transitions of significance in interpretation of solar-flare spectral observations. The wavelength determinations are usually in good agreement with calculated results which includes relativistic corrections, but discrepancies arise when nonrelativistic calculations are used. A comparison of the present results and those recently obtained by theta-pinch and laser-induced plasma sources is made for both heliumlike and lithiumlike ions; a few discrepancies occur, with results in most cases in better agreement with relativistically corrected calculations. Certain unidentified lines in the spectra may be attributable to radiative transitions between quartet states of lithiumlike ions.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 10
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  • 33
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    Intensity anomalies in the extreme VUV spectrum of Al/+3/ obtained in a laser-produced plasma (1974)
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    Publication Date: 2011-08-16
    Description: The results of experiments performed to check the possibility of stimulated emission in the extreme vacuum ultraviolet (VUV) by an Al(+3) laser-generated plasma are reported. It is concluded that the spectral line intensity anomalies previously observed are not due to population inversion.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Applied Physics Letters; 25; July 1
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  • 34
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    VUV dissociative excitation cross sections of H2O, NH3, and CH4 by electron impact (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Absolute excitation functions for excited fragments resulting from electron bombardment of H2O, NH3, and CH4 by low-energy electrons (0 to 300 eV) have been measured in the vacuum ultraviolet (1100 to 1950 A). The predominant emission for each molecule was the H Lyman-alpha line, while the O I, N I, C I, and C II emissions were at least an order of magnitude weaker. Absolute cross sections at 100 eV are given along with the appearance potential of the various processes and the possible dissociative-excitation channels through which such processes proceed.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 60; June 15
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  • 35
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    Absolute rotational Raman cross sections for N2, O2, and CO2 (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Optical Society of America; vol. 64
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  • 36
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    A relaxation theory of plasma-broadened He II lines (1974)
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    Publication Date: 2011-08-16
    Description: The relaxation theory of plasma line broadening developed by Smith and Hooper (1967) and extended by Smith (1968) is extended further to cover a case of a positively charged radiator. Differences in the theory, arising from its application to a charged radiator, are discussed in detail.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer; 14; June 197
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    Excitation of metastable argon and helium atoms by electron impact (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Using a time-of-flight method, the excitation of argon and helium metastables by electron impact is investigated in the energy range from threshold to about 50 eV. The secondary-electron yields of the metastable detector used are reviewed in detail. The effect of metastable recoil is also discussed. Comparisons with data from other investigators are presented.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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    Relaxation and frequency shifts in the ground state of Rb-85 (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Results are presented on the relaxation and frequency shifts measured for the 0-0 transition of the ground state of Rb-85 at 3.03 GHz in various physical environments. These results include data on spin-exchange, buffer-gas, and wall interactions.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 39
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    Effects of curvilinear motion in large-amplitude bending of C3 (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The geometry of the bending of a linear triatomic molecule is analyzed, and an expression for the average rotational constant is derived. A harmonic oscillator model of C3 is fitted to the observed rotational constant within 0.6%. The bond distance between atoms at zero bending is 1.287 A according to this model; this is noticeably larger than the average internuclear distance of 1.277 A for the vibrational ground state. The first order perturbation solutions for the vibrational energy levels, taking into account the effect of a quartic perturbation potential, closely match observed levels. For a square well potential model of C3, the effect of curvilinear motion in bending is similar to that found for the harmonic oscillator model, though the decreases in energy are about twice as large. In both models, the average energy decrease is relatively constant at approximately 10% over a wide range of vibrational quantum number.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 60; Feb. 1
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  • 40
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    Argon charge states due to impact of H+ and He+ ions (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Charge states of argon produced by bombardment with 100-keV to 1-MeV H+ and He+ projectiles were studied by examining high-resolution L-shell X-ray satellite spectra. Large differences appear in charge-state populations determined from X-ray data and Auger-electron data.-
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review Letters; 32; Mar. 18
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  • 41
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    ERTS-1, the spacecraft and its sensors (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The basic objectives of the ERTS-1 mission are defined as follows: (1) to determine what data can be acquired from an orbiting satellite on the natural and cultural resources and on the environment; and (2) to develop and demonstrate the combination of data-acquisition procedures and interpretative techniques which can make this new knowledge available for use in the many facets of man's life. A general description of the satellite's observatory system and its sensors is given, including the thermal control subsystem, the power subsystem, the attitude control subsystem, the orbit adjust subsystem, the telemetry and tracking systems, the communications and data handling subsystem, the return beam vidicon subsystem, the multispectral scanner subsystem, the two wideband video tape recorders, and the data collection subsystem.
    Keywords: SPACE VEHICLES
    Type: Journal of Environmental Sciences; 17; Mar
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  • 42
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    Three-body Coulomb systems using generalized angular-momentum S states (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: An expansion of the three-body Coulomb potential in generalized angular-momentum eigenfunctions developed earlier by one of the authors is used to compute energy eigenvalues and eigenfunctions of bound S states of three-body Coulomb systems. The results for He, H(-), e(-)e(+)e(-), and pmu(-)p are compared with the results of other computational approaches.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 43
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    Free-free absorption of infrared radiation in collisions of electrons with neutral rare-gas atoms (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A relationship between the inverse bremsstrahlung absorption cross section and the electron neutral momentum transfer cross section has been utilized to determine the infrared free-free continuum absorption coefficient for the negative ions of helium, neon, argon, krypton, and xenon. The values of the momentum transfer cross section for this calculation have been obtained from experimental measurements. Analytical expressions for the absorption coefficient have also been developed. From the results of this calculation, it is possible to determine the absorption coefficient per unit electron density per neutral atom for temperatures in the range from 2500 to 25,000 K. The results are compared with those from tabulations of previous calculations and those computed from theoretical values of the phase shifts for the elastic scattering of electrons by neutral atoms.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Astronomy and Astrophysics; 30; 2, Ja; Jan. 197
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  • 44
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    Absorption coefficients for hydrogen. III - Calculated pressure-induced H2-H vibrational absorption in the fundamental region (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer; 14; Feb. 197
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  • 45
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    Theory of pressure-induced vibrational and rotational absorption of diatomic molecules colliding with atoms at high temperatures (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer; 14; Jan. 197
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  • 46
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    Measurement of the relative cross sections for simultaneous ionization and excitation of the He/+/ n = 4 levels (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 47
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    Projectile charge-state dependence of K X-ray production by 1-4-MeV/amu heavy ions in gases (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 48
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    Skylab 1 and 2 - Pilots' report (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Details of powered flight are considered, giving attention to the lift-off, engine thrust, and separation from the S-1VB stage. The rendezvous checklist was performed on time and exactly prior to the first phasing maneuver. The Command Service Module was finally maneuvered to a position for hard docking. Attention is given to aspects of extravehicular activity during the mission and delays experienced in the separation procedure.
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  • 49
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    Pioneer 10 (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: On Dec. 4, 1973, after 21 months in flight, Pioneer 10 passed by Jupiter at a distance within 130,000 km of its cloud tops. During the month before and after, instrumentation on the spacecraft made a number of scientific measurements of the Jupiter environment, thus completing one of three scientific objectives of the mission. Previously, Pioneer 10 had explored the asteroid belt and had completed the second scientific objective by determining that the belt did not present a hazard to spacecraft passing through it. The third objective, the exploration of interplanetary phenomena, started with the launch of Pioneer 10 and will not be completed until 1977 when the spacecraft nears the orbit of Uranus and the signal from the spacecraft becomes too weak to be heard at ground receivers.
    Keywords: SPACE VEHICLES
    Type: Science; 183; Jan. 25
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  • 50
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    Space processing experiments on sounding rockets (1974)
    In:  Other Sources
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    Publication Date: 2019-01-25
    Description: The use of sounding rockets for the conduct of, and verification of, processing experiments and techniques under conditions of weightlessness are summarized. The experimental payloads, project management, mission schedules are also discussed.
    Keywords: SPACE VEHICLES
    Type: Proc. of the 3d Space Processing Symp. on Skylab Results, Vol. 2; p 565-579
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    SERT D spacecraft study (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The SERT D (Space Electric Rocket Test - D) study defines a possible spacecraft project that would demonstrate the use of electric ion thrusters for long-term (5 yr) station keeping and attitude control of a synchronous orbit satellite. Other mission objectives included in the study were: station walking to satellite rendezvous and inspection, use of low cost attitude sensing system, use of an advanced solar array orientation and slip ring system, and an ion thruster integrated directly with a solar array power source. The SERT D spacecraft, if launched, will become SERT 3 the third space electric thruster test.
    Keywords: SPACE VEHICLES
    Type: NASA-TM-X-71494
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  • 52
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    Radiative transitions involving the (2p2)(3 Pe) metastable autodetaching of H(-) (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The absorption coefficient for the free-bound transition H (ls) + e(-)+ h omega yields H(-)(2 sq p,(3)P(e)) is calculated (together with the differential emission rate for the inverse process) using ls - 2s - 2p close coupling continuum wave functions and a Hylleraas bound state wave function. A maximum in the absorption and emission spectra is found to occur at a photon wavelength of 1219.5 A, which is 2 A closer to the Lyman alpha line than predicted by the calculations of Drake, and is in closer agreement with the stellar absorption feature identified by Heap and Stecher. The free-bound absorption process appears to be a significant source of continuous ultraviolet opacity.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TM-X-70570 , X-602-74-13
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    Apollo experience report: Thermal protection subsystem (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The Apollo command module was the first manned spacecraft to be designed to enter the atmosphere of the earth at lunar-return velocity, and the design of the thermal protection subsystem for the resulting entry environment presented a major technological challenge. Brief descriptions of the Apollo command module thermal design requirements and thermal protection configuration, and some highlights of the ground and flight testing used for design verification of the system are presented. Some of the significant events that occurred and decisions that were made during the program concerning the thermal protection subsystem are discussed.
    Keywords: SPACE VEHICLES
    Type: NASA-TN-D-7564 , JSC-S-383
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  • 54
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    Method of laminating structural members (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A laminate is obtained by providing a lightweight core material, such as a honeycombed plastic or metal, within the cavity defined by an annular mold cavity frame. Face sheets, which are to be bonded to the core material, are provided on opposite sides of the frame and extend over the frame, thus sealing the core material in the cavity. An adhesive is provided between the core material and the face sheets and the combined thickness of the core material and adhesive is a close fit within the opposed face sheets. A gas tight seal, such as an O-ring gasket, is provided between the frame and the face sheet members to form a gas tight cavity between the face sheet members and the frame. External heat and pressure are used to bond the face sheets to the core material. Gas pressure is introduced into the sealed cavity to minimize out-gasing of the adhesive.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
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    Computer-aided space shuttle orbiter wing design study (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: An analytical and experimental investigation has been made to provide a space shuttle orbiter wing design that met the guideline requirements of landing performance, stability, and hypersonic trim for a specified center-of-gravity envelope. The analytical study was facilitated by the use of the Optimal Design Integration system (ODIN) and the experimental part of the investigation was conducted in the Langley low-turbulence pressure tunnel and the Langley continuous-flow hypersonic tunnel.
    Keywords: SPACE VEHICLES
    Type: NASA-TN-D-7478 , L-9099
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    Centaur Standard Shroud (CSS) full jettison test dynamic analysis (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: During the space power facility jettison tests, the non-domed half of the Centaur standard shroud was allowed to completely separate from its hinge connection and was caught in a horizontal catch net. A rigid body dynamic analysis that was performed to predict the half shroud prior to and after net contact is presented. Analytical predictions of the longitudinal and circumferential bending moments imposed on the half shroud by the catch net and the net pressure on the half shroud corrugated skin are also presented.
    Keywords: SPACE VEHICLES
    Type: NASA-TM-X-71537 , E-7943
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    Removal of spacecraft-surface particulate contaminants by simulated micrometeoroid impacts (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A series of hypervelocity impacts has been conducted in an exploding lithium-wire accelerator to examine with a far-field holographic system the removal of particulate contaminants from external spacecraft surfaces subjected to micrometeoroid bombardment. The impacting projectiles used to simulate the micrometeoroids were glass spheres nominally 37 microns in diameter, having velocities between 4 and 17 km/sec. The particulates were glass spheres nominally 25, 50, and 75 microns in diameter which were placed on aluminum targets. For these test, particulates detached had velocities that were log-normally distributed. The significance of the log-normal behavior of the ejected-particulate velocity distribution is that the geometric mean velocity and the geometric standard deviation are the only two parameters needed to model completely the process of particles removed or ejected from a spacecraft surface by a micrometeoroid impact.
    Keywords: SPACE VEHICLES
    Type: NASA-TN-D-7494 , L-9269
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  • 58
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    Apollo experience report the command and service module milestone review process (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The sequence of the command and service module milestone review process is given, and the Customer Acceptance Readiness Review and Flight Readiness Review plans are presented. Contents of the System Summary Acceptance Documents for the two formal spacecraft reviews are detailed, and supplemental data required for presentation to the review boards are listed. Typical forms, correspondence, supporting documentation, and minutes of a board meeting are included.
    Keywords: SPACE VEHICLES
    Type: NASA-TN-D-7599 , JSC-S-389
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    Results of investigations on a 0.010-scale model of the configuration 3 space shuttle orbiter and external tank in the NASA/Ames Research Center 3.5-foot hypersonic wind tunnel (IA15) (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Experimental aerodynamic investigations were conducted in a 3.5-foot hypersonic wind tunnel. The model used for this test was a 0.010-scale of the Configuration 2 Space Shuttle Orbiter and the External Tank. Six-component aerodynamic force and moment data were recorded over an angle of attack range from -8 deg to +30 deg at 0 deg and 5 deg angles of sideslip. Data was also recorded during beta sweeps of -8 deg to +10 deg at angles of attack of -10 deg, 0 deg, and 30 deg. All testing was done at Mach 7.3. Various elevon, rudder and orbiter to external tank attaching structures and fairings were tested to determine longitudinal and lateral-directional stability characteristics. Non-metric exhaust plumes were installed during a portion of the testing to determine the effects of the main propulsion system rocket plumes.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134089 , DMS-DR-2102
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    Feasibility of space disposal of radioactive nuclear waste. 2: Technical summary (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The feasibility of transporting radioactive waste produced in the process of generating electricity in nuclear powerplants into space for ultimate disposal was investigated at the request of the AEC as a NASA in-house effort. The investigation is part of a broad AEC study of methods for long-term storage or disposal of radioactive waste. The results of the study indicate that transporting specific radioactive wastes, particularly the actinides with very long half-lives, into space using the space shuttle/tug as the launch system, appears feasible from the engineering and safety viewpoints. The space transportation costs for ejecting the actinides out of the solar system would represent less than a 5-percent increase in the average consumer's electric bill.
    Keywords: SPACE VEHICLES
    Type: NASA-TM-X-2912 , E-7676
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    Vacuum jacketed composite propulsion feedlines for cryogenic launch and space vehicles. Volume 2: Appendixes (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: For abstract, see N74-18505.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134554
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    Results of low speed wind tunnel tests on a .0405 scale model Rockwell Space Shuttle Orbiter tested both in free air and in the presence of a ground plane (OA16) (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Experimental aerodynamic investigations were conducted on a .0405 scale representation of the space shuttle orbiter in a 7.75 x 11 foot low speed wind tunnel during the time period March 21, to April 17, 1973. The primary test objectives were to investigate both the aerodynamic and propulsion effects of various air breathing engine systems in free air and in the presence of the ground. The free air portion of this test investigated the aerodynamic effects of engine nacelle number, nacelle grouping, and nacelle location. For this testing the model was sting mounted on a six component internal strain gage balance entering through the model base. The ground plane portion of the aerodynamic test investigated the same nacelle effects at ground plane locations of full scale W.P. = 239.9, 209.3, 158.9, 108.5, and 7.78 in. At the conclusion of the aerodynamic test period the propulsion effects of various nacelle locations and freestream orientations in the presence of the ground were investigated.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-128793 , DMS-DR-2038
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    Photoelectron angular distributions as a probe of anisotropic electron-ion interactions (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Expressions are given for atomic photoelectron angular distributions in LS coupling in which the role of anisotropic final state electron-ion interactions emerges explicitly. Calculations of photoelectron angular distributions for atomic sulfur are presented in which these anisotropic interactions produce pronounced deviations from the predictions of the Cooper-Zare model. Such effects are expected to be a general feature of photoelectron angular distributions for most open shell atoms.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-137076
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    Method for compression molding of thermosetting plastics utilizing a temperature gradient across the plastic to cure the article (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method is described for compression molding of thermosetting plastics composition. Heat is applied to the compressed load in a mold cavity and adjusted to hold molding temperature at the interface of the cavity surface and the compressed compound to produce a thermal front. This thermal front advances into the evacuated compound at mean right angles to the compression load and toward a thermal fence formed at the opposite surface of the compressed compound.
    Keywords: SPACE VEHICLES
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    Method of fabricating an article with cavities (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An article having a cavity with a thin bottom wall is provided by assembling a thin sheet, for example, a metal sheet, adjacent to the surface of a member having one or more apertures. A bonding adhesive is interposed between the thin sheet and the subadjacent member, and the thin sheet is subjected to a high fluid pressure. In order to prevent the differential pressure from being exerted against the thin sheet, the aperture is filled with a plug of solid material having a linear coefficient of thermal expansion higher than that of the member. When the assembly is subjected to pressure, the material is heated to a temperature such that its expansion exerts a pressure against the thin sheet thus reducing the differential pressure.
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    Apollo Saturn 511 effluent measurements from the Apollo 16 launch operations: An experiment (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An experiment was performed in conjunction with the Apollo 16 launch to define operational and instrumentational problems associated with launch-vehicle exhaust effluent monitoring. Ground and airborne sampling were performed for CO, CO2, hydrocarbons, and particulates. Sampling systems included filter pads and photometers for particulates and whole-air grab samples for gases. Launch debris was identified in the particulate samples at ground level(taken immediately after launch) and in the airborne measurements (taken 40 to 50 minutes after launch approximately 40 km downwind of the pad). Operational problems were identified and included the need for higher instrumentation mobility and the need for real-time sampling instrumentation as opposed to collection-type samples such as the whole-air grab sample.
    Keywords: SPACE VEHICLES
    Type: NASA-TM-X-2910 , L-9097
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    Nonstationary homogeneous nucleation (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The theory of homogeneous condensation is reviewed and equations describing this process are presented. Numerical computer solutions to transient problems in nucleation (relaxation to steady state) are presented and compared to a prior computation.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-136830 , JPL-TM-33-666
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    Apollo experience report: Development and use of specialized radio equipment for Apollo recovery operations (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: New personal communications equipment was required for the Apollo Program recovery operations. Two new, small, personal radios were developed and used successfully in the Apollo recovery program.
    Keywords: SPACE VEHICLES
    Type: NASA-TN-D-7587 , JSC-S-385
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    Spacecraft control section for the improved Small Astronomy Satellite (SAS) (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The upgraded spacecraft control section for the Small Astronomy Satellite is able to point its thrust axis to any direction in space; it can also spin or slow its outer body rotation to zero for star-locked pointing of side viewing experiments. A programmable telemetry system and delayed command system enhance the inherent capability of a spacecraft designed to be used for a variety of experiments, each of which can be built independently and attached just prior to final acceptance testing and launch. The design of this new spacecraft, whose first launch is scheduled for 1975, is provided in sufficient detail to permit the reader to ascertain its suitability for specific experiments. A summary of the spacecraft characteristics, project reliability requirements, and environmental test conditions are included in the appendices.
    Keywords: SPACE VEHICLES
    Type: NASA-TM-X-70569 , X-405-74-7
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    Measurement of integrated intensities of acetylene bands at 3.04, 7.53 and 13.7 microns (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Integrated intensities of acetylene bands at 3.04, 7.53, and 13.7 microns measured at 300 K at a spectral resolution of 0.6 slit widths per cm, using the technique described by Penner (1959), are presented. Comparisons with other published measurements suggest that the presented intensity values are reasonably well determined.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer; 14; Sept
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  • 71
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    Collision-broadened line widths of tetrahedral molecules. I - Theoretical formulation (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer; 14; Oct. 197
    Format: text
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  • 72
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    On the determination of the quadrupole moment of oxygen from self-broadened line widths in the microwave spectrum (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer; 14; Oct. 197
    Format: text
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  • 73
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    Elastic and inelastic electron scattering at 20 and 60 eV from atomic Cu (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Normalized differential and integral electron-impact cross sections are presented for elastic scattering and for specified excitation levels of atomic copper at 20 and 60 eV. For some excitation levels, an unexpectedly large cross section was found, which at certain angular and energy ranges surpasses the cross section for elastic scattering.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review Letters; 33; July 22
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  • 74
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    Electron detachment in low-energy collisions of H/-/ and D/-/ with He (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The applicability of the complex-potential theory to H(-)-He collisions is investigated. Measurements are conducted of the elastic differential cross section for H(-)-He collisions, taking into account energies in the range from 5 to 120 eV. A preliminary determination is made of the energy spectrum of detached electrons. The results are interpreted in terms of the complex-potential theory. The crossing point is determined together with the general shape of the HeH(-) potential curve.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 9
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  • 75
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    Cross sections and band strengths for the N2O/+/ /A 2Sigma+ to X 2Pi/ system produced by vacuum ultraviolet radiation (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Analysis of cross sections that have been obtained for the production of the N2O(+) (A 2Sigma+ to X 2Pi) fluorescence, using vacuum ultraviolet radiation between 462 and 755 A. The fluorescence spectra produced using incident photons of 715.6- and 754.9-A wavelengths are presented, as well as the relative fluorescence cross sections for the individual observed bands of the above-mentioned N2O(+) system. Finally, absolute cross sections for the production of the N2O(+) (A 2Sigma+ to X 2Pi) system are presented, as well as band strengths for the A 2Sigma+(0,0,0) to X 2Pi(n1,n2,0) fluorescence.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Physics; vol. 7
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  • 76
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    Automatic spacecraft detumbling by internal mass motion (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: In the operation of future manned space vehicles, there will always be a finite probability that an accident will occur which results in uncontrolled tumbling of a craft. Hard docking by a manned rescue vehicle is not acceptable because of the hazardous environment to which rescue crewmen would be exposed and excessive maneuvering accelerations during docking operations. A movable-mass control concept, which is activated upon initiation of tumbling and is autonomous, can convert tumbling motion into simple spin. The complete equations of motion for an asymmetric rigid spacecraft containing a movable mass are presented, and appropriate control law and system parameters are selected to minimize kinetic energy, resulting in simple spin about the major principal axis. Simulations indicate that for a large space station experiencing a collision, which results in tumbling, a 1% movable mass is capable of stabilizing motion in 2 hr.
    Keywords: SPACE VEHICLES
    Type: AIAA Journal; 12; Apr. 197
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  • 77
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    Formation of HO2/+/ by reaction of metastable O2/+/ ions with H2 (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The photoionization efficiency curves of H2(+), O2(+), and HO2(+) have been studied in a mixture of hydrogen and oxygen over the wavelength range from 650 to 810 A. The HO2(+) ion appears at 804 A, the threshold for ionization of H2, by the reaction H2(+) + O2 yields HO2(+) + H. The relative photoionization efficiency curves of H2(+) and HO2(+) are the same from 804 to 764 A. Below 764 A production of the 4 Pi u metastable electronic state of O2(+) leads to the formation of HO2(+) by the reaction O2(+)(a 4 Pi u) + H2 yields HO2(+) + H.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 60; Feb. 15
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  • 78
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    Character of the pair interaction in solid and gaseous H2 (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Existing theoretical H2 pair potentials are investigated. We develop a spherically symmetric potential applicable to solid H2. It yields a ground-state energy of -98.7 K (experimental values range from -93.5 to -101 K). Pressure-volume data are also in excellent agreement with experiment between 0 and 25 kbar. Second virial coefficients using this potential are consistently too low. When an anisotropic pair potential is used, agreement becomes very good.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review Letters; 32; Apr. 8
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  • 79
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    A movable-mass attitude stabilization system for cable-connected artificial-g space stations (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The development of an active, momentum-exchange system to be used for attitude stabilization of a class of cable-connected artificial-g space stations is studied. A system which employs a single movable control mass is examined for the control of a space station which has the physical appearance of two cylinders connected axially by cables. The dynamic model for the space station includes its aggregate rigid body rotation and relative torsional rotation between the bodies. A zero torsional stiffness design (one cable) and a maximum torsional stiffness design (eight cables) are examined in various stages of deployment, for selected spin velocities ranging from 4 rpm upwards. A linear, time-invariant, feed-back control system is employed, with gains calculated via a root-specification procedure. The movable mass controller provides critical wobble-damping capability for the crew quarters for all configurations and spin velocity.
    Keywords: SPACE VEHICLES
    Type: Journal of Spacecraft and Rockets; 11; Mar. 197
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  • 80
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    Investigations on an 0.030-scale space shuttle vehicle configuration 140A/B orbiter model in the Ames Research Center 9 by 7-foot supersonic wind tunnel (OA53B) (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A wind tunnel test of an 0.030-scale space shuttle vehicle orbiter configuration 140A/B model was conducted in the Ames Research Center 9- by 7-foot supersonic wind tunnel. This part of test series OA53 was conducted at Mach numbers of 1.60 and 2.00 and at Reynolds numbers ranging from 1.0 million per foot to 4.0 million per foot. The objective was to establish and verify longitudinal and lateral-directional aerodynamic performance, stability, and control characteristics for the configuration 140A/B SSV orbiter. Reynolds number studies were performed on certain nominal control-setting configurations, and examinations were made of the incremental effects of an alternate wing leading-edge configuration and of a sealed elevon-split construction. Six-component force and moment data, base and cavity pressures, bodyflap, elevon, speedbrake, and rudder hinge moments, and vertical tail forces and moments were measured for the orbiter.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134119 , DMS-DR-2178
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  • 81
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    Heat transfer tests of an 0.006-scale thin skin space shuttle thermocouple model (41-0) in the Langley Research Center variable density tunnel at M equals 8 (OH13) (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Orbiter entry heating distributions were obtained, and phase change paint data was correlated with thermocouple data during a program of heat transfer testing on a 0.006 scale space shuttle orbiter vehicle. The orbiter was tested at 0, 30, and 35 degrees angle of attack at Reynolds numbers of 1, 2, 3, 4, and 6 million per foot. Temperature data were obtained from a total of 57 thermocouples.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134101 , DMS-DR-2096
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  • 82
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    Results of tests in the NASA/LaRC 31-inch CFHT on an 0.010-scale model (32-OT) of the space shuttle configuration 3 to determine the RCS jet flowfield interaction effects on aerodynamic characteristics (IA60/0A105), volume 2 (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Tests were conducted in the NASA Langley Research Center 31-inch continuous flow hypersonic wind tunnel from 14 February to 22 February 1974, to determine RCS jet interaction effect on the hypersonic aerodynamic and stability and control characteristics prior to RTLS abort separation. The model used was an 0.010-scale replica of the space shuttle vehicle configuration 3. Hypersonic stability data were obtained from tests at Mach 10.3 and dynamic pressure of 150 psf for the intergrated orbiter and external tank and the orbiter alone. RCS modes of pitch, yaw, and roll at free flight dynamic pressure simulation of 7, 20, and 50 psf were investigated. The effects of speedbrake, bodyflap, elevon, and aileron deflections were also investigated.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134106 , DMS-DR-2137-VOL-2
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  • 83
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    Investigation of space shuttle orbiter subsonic stability and control characteristics in the NAAL low speed wind tunnel (OA62B), volume 2 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Experimental aerodynamic investigations were conducted on a sting-mounted 0.0405 scale representation of the 140A/B space shuttle orbiter in a 7.75 ft by 11 ft low speed wind tunnel during the period from November 14, 1973 to December 6, 1973. Establishment of basic longitudinal stability characteristics in and out of ground effect, and the establishment of lateral-directional stability characteristics in free air were the primary test objectives. The following effects and configurations were tested: (1) two dual podded nacelle configurations; (2) stability and control characteristics at nominal elevon deflections, rudder deflections, airleron deflections, rudder flare angles, and body flap deflections; (3) effects of various elevon and elevon/fuselage gaps on longitudinal stability and control; (4) pressures on the vertical tail at spanwise stations using pressure bugs; (5) aerodynamic force and moment data measured in the stability axis system by an internally mounted, six-component strain gage balance. For Vol. 1, see N74-32324.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134113 , DMS-DR-2104-VOL-2
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  • 84
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    A study of the feasibility of directly applying gas generator systems to space shuttle mechanical functions (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: This study examined the current status and potential application of pyrotechnic gas generators and energy convertors for the space shuttle program. While most pyrotechnic devices utilize some form of linear actuation, only limited use of rotary actuators has been observed. This latter form of energy conversion, using a vane-type actuator as optimum, offers considerable potential in the area of servo, as well as non-servo systems, and capitalizes on a means of providing prolonged operating times. Pyrotechnic devices can often be shown to provide the optimum means of attaining a truly redundant back-up to a primary, non-pyrotechnic system.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-2454
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  • 85
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    Apparatus for forming drive belts (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: An apparatus for manufacturing belts, such as seamless belts, is provided, the apparatus has relatively movable rollers that are mounted in an oven. A belt blank, for example, of a thin polyester film, is rotated on the rollers as heat is applied. Four rollers, each mounted on a separate roller assembly, are movable along appropriate tracks while a fifth centrally located roller is stationary. A pair of dc motors are operatively connected to a speed reduction gear assembly to provide a pair of rotating drive shafts that extend into the oven. One rotating shaft drives all of the rollers through a rotational gear assembly while the other drive shaft is capable of positioning the movable rollers through respective rotating threaded shafts. Control devices are provided for controlling the motors while measuring devices are operatively connected to the positional drive shaft to indicate the position of the rollers.
    Keywords: SPACE VEHICLES
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  • 86
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    The definition and specification of the near earth environmental criteria for spacecraft thermal design (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The variation of the earth's thermal and albedo radiation received by a near-earth orbiting space vehicle or space payload as a result of temporal variation of the earth atmosphere is discussed. A statistical study of current satellite data for determining probability distributions is proposed. With these distributions the thermal designer can define confidence levels on predicted temperature ranges which are compatible with engineering models for use in design, failure probabilities, and spacecraft cost estimates. Use of the distributions in environmental criteria guidelines is also considered.
    Keywords: SPACE VEHICLES
    Type: NASA-TM-X-64870
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  • 87
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    Asymmetrical booster ascent guidance and control system design study. Volume 1: Summary (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Dynamics and control, stability, and guidance analyses are summarized for the asymmetrical booster ascent guidance and control system design studies, performed in conjunction with space shuttle planning. The mathematical models developed for use in rigid body and flexible body versions of the NASA JSC space shuttle functional simulator are briefly discussed, along with information on the following: (1) space shuttle stability analysis using equations of motion for both pitch and lateral axes; (2) the computer program used to obtain stability margin; and (3) the guidance equations developed for the space shuttle powered flight phases.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134398 , REPT-5-2581-HOU-154-VOL-1
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  • 88
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    Asymmetrical booster guidance and control system design study. Volume 3: Space shuttle vehicle SRB actuator failure study (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The investigation of single actuator failures on the space shuttle solid rocket booster required the analysis of both square pattern and diamond pattern actuator configurations. It was determined that for failures occuring near or prior to the region of maximum dynamic pressure, control gain adjustments can be used to achieve virtually nominal mid-boost vehicle behavior. A distinct worst case failure condition was established near staging that could significantly delay staging. It is recommended that the square pattern be retained as a viable alternative to the baseline diamond pattern because the staging transient is better controlled resulting in earlier staging.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134400 , REPT-5-2581-HOU-154-VOL-3
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  • 89
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    Space shuttle SRM interim contract, part 1 (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Essential studies and analyses required to integrate the SRM into the booster and overall space shuttle system. Emphasis was placed on the case, nozzle, insulation, and propellant components with resulting performance, weight, and structural load characteristics being generated. Effort conducted during the time period of this contract included studies, analyses, planning, and preliminary design activities. Technical requirements identified in the SRM Project Request for Proposal No. 8-1-4-94-98401 and Thiokol's proposed SRM design (designated Configuration 0) established the basis for this effort. The requirements were evaluated jointly with MSFC and altered where necessary to incorporate new information that evolved after issuance of the RFP and during the course of this interim contract. Revised water impact loads and load distributions were provided based on additional model test data and analytical effort conducted by NASA subsequent to the RFP release. Launch pad peaking loads into the SRM aft skirt were provided which also represented a change from RFP requirements. A modified SRM/External Tank (ET) attachment configuration with new structural load data was supplied by NASA, and direction was received to include a 2 percent inert weight contingency.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-120404 , TWR-10075-PT-1 , PUBL-74334-PT-1
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  • 90
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    GEOS observation systems intercomparison investigation results (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The results of an investigation designed to determine the relative accuracy and precision of the different types of geodetic observation systems used by NASA is presented. A collocation technique was used to minimize the effects of uncertainties in the relative station locations and in the earth's gravity field model by installing accurate reference tracking systems close to the systems to be compared, and by precisely determining their relative survey. The Goddard laser and camera systems were shipped to selected sites, where they tracked the GEOS satellite simultaneously with other systems for an intercomparison observation.
    Keywords: SPACE VEHICLES
    Type: NASA-TM-X-70722 , X-932-74-212
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  • 91
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    Atmospheric entry probes for outer planet exploration. Outer planet entry probe technical summary (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The use of unmanned space probes for investigating the conditions existing on and around the outer planets of the solar system is discussed. The subjects included in the report are: (1) the design of a common entry probe for outer planet missions, (2) the significant trades related to the development of a common probe design, (3) the impact of bus selection on probe design, (4) the impact of probe requirements on bus modifications, and (5) the key technology elements recommended for advanced development. Drawings and illustrations of typical probes are included to show the components and systems used in the space probes.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-137542
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  • 92
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    Operations analysis (study 2.1): Payload designs for space servicing (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Potential modes of operating in space in the space shuttle era are documented. The October 1973 NASA Mission Model provides a definition of various NASA and non-DOD automated payload configurations when employed in an expendable mode. The model also specifies a launch schedule for initial deployment of payloads as well as for subsequent replacements at periodic cycles. This model and its associated payload definitions serve as a foundation for the data presented in this report. The reference model has been revised to reflect automated space servicing of payloads as an operational concept instead of the existing expendable approach. The indication is that the bulk of a payload's subsystems and mission equipment require no support over the lifetime of the program. However, failure of a single unit could result in loss of the mission objectives. When space servicing is employed, the approach is to replace only that unit causing the anomaly. This concept affords an opportunity to standardize space replacable units, as well as to reduce the expense of logistics support, by allowing multiple servicing on any single upper stage/shuttle flight.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-139588 , ATR-74(7341)-3
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  • 93
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    Space shuttle/payload interface analysis. Volume 4: Business Risk and Value of Operations in Space (BRAVO). Part 3: Workbook (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: A collection of blank worksheets for use on each BRAVO problem to be analyzed is supplied, for the purposes of recording the inputs for the BRAVO analysis, working out the definition of mission equipment, recording inputs to the satellite synthesis computer program, estimating satellite earth station costs, costing terrestrial systems, and cost effectiveness calculations. The group of analysts working BRAVO will normally use a set of worksheets on each problem, however, the workbook pages are of sufficiently good quality that the user can duplicate them, if more worksheet blanks are required than supplied. For Vol. 1, see N74-12493; for Vol. 2, see N74-14530.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-139592 , ATR-74(7334)-1-VOL-4-PT-3
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  • 94
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    Reusable Agena study. Volume 2: Technical (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The application of the existing Agena vehicle as a reusable upper stage for the space shuttle is discussed. The primary objective of the study is to define those changes to the Agena required for it to function in the reusable mode in the 100 percent capture of the NASA-DOD mission model. This 100 percent capture is achieved without use of kick motors or stages by simply increasing the Agena propellant load by using optional strap-on-tanks. The required shuttle support equipment, launch and flight operations techniques, development program, and cost package are also defined.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-120362 , LMSC-D383059-VOL-2
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  • 95
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    Space shuttle/payload interface analysis. Volume 4: Business Risk and Value of Operations in Space (BRAVO). Part 1: Summary (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Background information is provided which emphasizes the philosophy behind analytical techniques used in the business risk and value of operations in space (BRAVO) study. The focus of the summary is on the general approach, operation of the procedures, and the status of the study. For Vol. 1, see N74-12493; for Vol. 2, see N74-14530.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-139591 , ATR-74(7334)-1-VOL-4-PT-1
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  • 96
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    Quantitative multielement analysis using high energy particle bombardment (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Charged particles ranging in energy from 0.8 to 4.0 MeV are used to induce resonant nuclear reactions, Coulomb excitation (gamma X-rays), and X-ray emission in both thick and thin targets. Quantitative analysis is possible for elements from Li to Pb in complex environmental samples, although the matrix can severely reduce the sensitivity. It is necessary to use a comparator technique for the gamma-rays, while for X-rays an internal standard can be used. A USGS standard rock is analyzed for a total of 28 elements. Water samples can be analyzed either by nebulizing the sample doped with Cs or Y onto a thin formvar film or by extracting the sample (with or without an internal standard) onto ion exchange resin which is pressed into a pellet.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-139619
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  • 97
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    Hypersonic stability and control characteristics of the Rockwell International 139-B space shuttle orbiter (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The purpose of this study was to determine the hypersonic aerodynamic performance, longitudinal trim, static stability, and the extent of the center-of-gravity boundaries within the design control limits as well as to examine the effect of Reynolds number on the longitudinal stability of the 139-B space shuttle orbiter. A 0.004 scale model (34-0)was tested in helium over an angle-of-attack range of 18 deg to 54 deg at 0 deg and -minus 5 deg sideslip angles. The total pressure was varied for selected configurations to obtain a Reynolds number range, based on model length, from 0.51 million to 3.6 million at Mach numbers between 17.6 and 21.6 Surface oil-flow studies and electron-beam illuminated-flow studies were also conducted at angles-of-attack of 30 deg, 40 deg, and 50 deg for selected Reynolds numbers.
    Keywords: SPACE VEHICLES
    Type: NASA-TM-X-71968
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  • 98
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    Parachute-deployment-parameter identification based on an analytical simulation of Viking BLDT AV-4 (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: A six-degree-of-freedom analytical simulation of parachute deployment dynamics developed at the Langley Research Center is presented. A comparison study was made using flight results from the Viking Balloon Launched Decelerator Test (BLDT) AV-4. Since there are significant voids in the knowledge of vehicle and decelerator aerodynamics and suspension system physical properties, a set of deployment-parameter input has been defined which may be used as a basis for future studies of parachute deployment dynamics. The study indicates the analytical model is sufficiently sophisticated to investigate parachute deployment dynamics with reasonable accuracy.
    Keywords: SPACE VEHICLES
    Type: NASA-TN-D-7678
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  • 99
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    Reusable Centaur study. Volume 2: Final report (1974)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: For abstract, see N74-31346.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-120373 , CASD-NAS-73-032-VOL-2
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  • 100
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    Payload/orbiter contamination control requirement study (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study was conducted to determine and quantify the expected particulate and molecular on-orbit contaminant environment for selected space shuttle payloads as a result of major shuttle orbiter contamination sources. Individual payload susceptibilities to contamination are reviewed. The risk of payload degradation is identified and preliminary recommendations are provided concerning the limiting factors which may depend on operational activities associated with the payload/orbiter interface or upon independent payload functional activities. A basic computer model of the space shuttle orbiter which includes a representative payload configuration is developed. The major orbiter contamination sources, locations, and flux characteristics based upon available data have been defined and modeled.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-120379 , MCR-74-93
    Format: application/pdf
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