History of NACA/NASA rotating-wing aircraft research, 1915-1970. III
NACA/NASA rotary wing aircraft research history 1915-1970, Part 3, covering rotor and helicopter theory, related flight and wind tunnel testing, etc
Gustafson, F. B.↗
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History of NACA/NASA rotating-wing aircraft research, 1915-1970. III Cont'd
NACA/NASA rotating wing aircraft research history 1915-1970, Part 3, covering rotor dynamics and flying qualities, hovering tests, rotor flow, loads, etc
Gustafson, F. B.↗
History of NACA/NASA rotating-wing aircraft research, 1915-1970. IV
NACA/NASA rotating wing aircraft research history during 1955-1970 period, discussing wind tunnel research
Gustafson, F. B.↗
A numerical method for predicting the pressure history of a sonic boom wave incident on arbitrarily oriented plane walls
Sonic boom wave pressure history prediction on arbitrarily oriented plane walls by explicit fixed mesh time dependent numerical method
Rao, B. M.↗
Sliding-load history effects on the friction of MoS2 in vacuum
Sliding load history effects on friction of thin burnished films of molybdenum disulfide in vacuum
Jamison, W. E.↗
Cation distributions and cooling history of clinopyroxenes from Oceanus Procellarum
Oxidation state of iron and cation distribution over M1 and M2 sites in clinopyroxenes from Apollo 12 by Mossbauer absorption spectroscopy, noting cooling history
Hafner, S. S.↗
Crystallization histories of clinopyroxenes in two porphyritic rocks from Oceanus Procellarum
Clinopyroxene crystallization histories of Apollo 12 porphyritic basalt rocks 12021 and 12052 from Oceanus Procellarum
Bence, A. E.↗
Investigations of the natural history of the regolith at the Apollo 12 site
Size distribution, composition and history of regolith fines at Apollo 12 site
Bunch, T.↗
Model history of the lunar surface
Lunar surface history model, discussing mascons, chemical composition, isochron ages and seismic and electrical properties of samples
Hawkins, J. W.↗
The irradiation history of lunar samples
Apollo 11 and 12 lunar samples history of irradiation exposure to galactic cosmic rays and solar wind, using rare gas and Gd isotope measurements
Burnett, D. S.↗
The exposure history of the Apollo 12 regolith
Radiation exposure history from fossil tracks in Apollo 12 surface rocks and double core regolith samples, comparing with Saint Severin meteorite
Arrhenius, G.↗
Lunar anorthosite 15415 - Texture, mineralogy, and metamorphic history.
Lunar anorthosite 15415 consists almost entirely of anorthite (homogeneous anorthite 96.6 molecule percent), with accessory diopsidic augite and traces of hypersthene, ilmenite, and a silica mineral. The rock has had a complex metamorphic history. The texture reflects at least two episodes of shearing (followed by intense and partial recrystallization, respectively), one episode of cataclastic deformation, and one or more episodes of shattering and fragmentation.
James, O. B.↗
Martian cratering. II - Asteroid impact history.
This paper considers the extent to which Martian craters can be explained by considering asteroidal impact. Sections I, II, and III of this paper derive the diameter distribution of hypothetical asteroidal craters on Mars from recent Palomar-Leiden asteroid statistics and show that the observed Martian craters correspond to a bombardment by roughly 100 times the present number of Mars-crossing asteroids. Section IV discusses the early bombardment history of Mars, based on the capture theory of Opik and probable orbital parameters of early planetesimals. These results show that the visible craters and surface of Mars should not be identified with the initial, accreted surface. A backward extrapolation of the impact rates based on surviving Mars-crossing asteroids can account for the majority of Mars craters over an interval of several aeons, indicating that we see back in time no further than part-way into a period of intense bombardment. An early period of erosion and deposition is thus suggested. Section V presents a comparison with results and terminology of other authors.
Hartmann, W. K.↗
Distinct cooling histories of Apollo 14 basalts.
The subsolidus cooling history of basaltic rocks can be deduced from the distribution of divalent Mg and Fe ions over the two nonequivalent positions M1 and M2 in pyroxene. The ion exchange reaction between M1 and M2 is generally characterized by rapid kinetics. It is found that the normal cooling process of basalt 14053 was interrupted at a temperature below 840 C and that the rock was then quenched extremely rapidly.
Gray, N.↗
Thermal history of the moon.
The thermal history of the lunar interior has been investigated for many sets of parameters and initial conditions by the construction of mathematical models. These models have been extended to include the effects of melting and redistribution of radioactive heat sources with time. The models considered include the possibility of heat transfer by lattice conduction, radiative transfer, removal of radioactive heat sources and, in a molten zone, fluid convection. The energy sources are divided into initial temperature sources that operate during the formation of the moon or shortly thereafter, and long-lived radioactive heat sources.
Reynolds, R. T.↗
Lunar thermal history revisited.
New information is used to demonstrate that better models for the thermal history of the moon are required. As a first step, account is taken of (1) a nonuniform initial composition in terms of fraction of low melting to high melting phase present, and for variation in the uranium, potassium, and thorium contents as a function of depth, (2) partitioning of the radioactive elements between the melt and the solid phases, and (3) a cutoff value of melt which must be exceeded before magma can move to the surface. The results of several attempts to determine whether reasonable conditions, composition, and thermal properties can be expected to give rise to two separate periods of volcanism are discussed. Two models with somewhat different distributions of radioactive heat sources and different conductivities are examined.
Mcconnell, R. K., Jr.↗
Cosmic influences on the early history of the lunar surface.
The testimony which the main features of the lunar surface bear on the cosmic environment in which the satellite acquired its principal morphological characteristics is examined. It is assumed as a working hypothesis that, in the earliest stages of the moon's history, the lunar sculpture in the continental areas was predominantly shaped by external impacts. It is considered that the argument against heliocentric orbits of particles whose collisions with the moon disfigured most of its continental areas continues to hold good. The distribution of craters due to oblique impacts appears to be essentially at random all over the lunar surface.
Kopal, Z.↗
Effects of surface anomalies on certain model generated meteorological histories
The Mintz-Arakawa 2-level general circulation model has been used in a series of experiments to compute the response of the model atmosphere to: (1) a positive sea surface temperature anomaly in the North Pacific Ocean in summer and in winter, (2) an identical anomaly in the South Pacific Ocean in the Southern Hemisphere winter, and (3) anomalous northward and southward displacements of the Northern Hemisphere snow line over the continents. In each case computations were carried out for 90 forecast days. Results are shown in terms of the differences between anomaly and control histories. Time series of certain regional response indices, including area-average sea level pressure and 600 mb circulation indices, as well as 30-day mean sea level pressure maps are used in the analysis. Of particular interest is the evidence of significant interhemisphere influence.
Spar, J.↗