N O T I C E THIS DOCUMENT HAS BEEN REPRODUCED FROM MICROFICHE. ALTHOUGH IT IS RECOGNIZED THAT CERTAIN PORTIONS ARE ILLEGIBLE, IT IS BEING RELEASED IN THE INTEREST OF MAKING AVAILABLE AS MUCH
An equivalent layer magnetization model obtained from inversion of long wavelength satellite magnetic anomaly data indicates a very magnetic source region centered in south central Kentucky. The magnetization maximum nearly coincides with a gravity high elongated north-south and extending into Tennessee. Previous refraction profiles suggest that the source of the gravity anomaly is a large mass of rock occupying much of the crustal thickness. The outline of the source delineated by gravity contours is also discernible in aeromagnetic anomaly patterns. Taken together, the geophysical data suggest a large, localized mass of intracrustal rock which is both dense and very magnetic. A simple magnetization/density model is given which accounts for the gravity and long wavelength aeromagnetic anomalies due to the body. We interpret it as a mafic plutonic complex, and several lines of evidence are consistent with a rift association. The body is, however, clearly related to the inferred position of the Grenville Front. It is bounded on the north by the fault zones of the 38th Parallel Lineament. The inferred mean magnetization (4 A/m) of the body is large, but not inconsistent with values reported by others for deep crustal bodies associated with long wavelength magnetic anomalies. Such magnetization levels can be ach'eved with :magnetic mineralogies produced by normal oxidation and.metamorph°c processes and enhanced by viscous build-up, especially in mafic rocks of alkaline character.
Recommended performance standards for electric and hybrid vehicles
Minimum performance standards for electric and hybrid vehicles were developed. The standards cover passenger cars and commercial vehicles, with the latter having possible agricultural uses. The primary results cover performance parameters such as payload, acceleration time, top speed, range (both constant speed and on an SAE J227a schedule C cycle), maximum energy consumption, gradability, battery life, battery recharge time, safety standards, handling, weatherproofing, audio and radiation noise, and maintainability. The performance standards are substantially less than those of conventional automobiles but represent a compromise between perceived user needs, actual user needs, measured and claimed performance of existing vehicles, the views of highway planners, views as expressed by manufacturers, design studies conducted by contractors for ERDA, availability in the near term, and cost. The performance standards for hybrid vehicles reflect the same standards for an all electric vehicle except that the engine is used to extend the vehicle range so as to increase its utility. (ERA citation 03:012799)
Venus: Evolution of the Upper Atmospheric Clouds
Abstract The large number of UV photographs taken by different observatories throughout the world are grouped for analysis at the IAU Planetary Photograph Center of Meudon Observatory. Three horizontal V, Y, or psi-shaped dark-hued cloud features are usually aligned along the equator and move 110 m s−1 westward in a planetary-wide rotation. The more intense and distinctly V-Shaped features last several weeks. The smaller scale cloud structures usually show significant changes after each successive rotation in 4 days around the planet. The average UV contrast is 32% but can fluctuate from disappearance to 37%. For periods of several years, the polar areas are sometimes covered by a white cloud. According to a set of photographs taken at Pic-du-Midi, this never occurred between 1962 and 1966 but has happened during 25% of the time for at least one pole since 1967, and only when the planet was in a given half of its orbit. These polar clouds are ephemeral and usually last several weeks or months; they evolve...