Download or read book Rapid Variations in Spacecraft Potential written by Henry Berry Garrett and published by . This book was released on 1977 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasing complexity and sophistication of synchronous orbit satellites has resulted in a corresponding increase in their susceptibility to anomalous behavior and disruption. Many of these problems can be attributed to the buildup of large potentials on various surfaces of the satellites in response to the ambient space plasma. Such large potentials (as great as -20,000 V relative to the ambient plasma) can produce anomalies and disruptions by causing arcing between the surfaces. In this report, the question of the time rate of change of satellite potential is studied. Theory and observations are reviewed to give estimates of the time rate of change in potentials encountered at synchronous orbit. A clear need for future study is indicated. Plans for instrumentation being developed at AFGL to study the area are discussed. (Author).
Download or read book Rapid Variations in Spacecraft Potential written by Henry B. Garrett and published by . This book was released on 1977 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasing complexity and sophistication of synchronous orbit satellites has resulted in a corresponding increase in their susceptibility to anomalous behavior and disruption. Many of these problems can be attributed to the buildup of large potentials on various surfaces of the satellites in response to the ambient space plasma. Such large potentials (as great as -20,000 V relative to the ambient plasma) can produce anomalies and disruptions by causing arcing between the surfaces. In this report, the question of the time rate of change of satellite potential is studied. Theory and observations are reviewed to give estimates of the time rate of change in potentials encountered at synchronous orbit. A clear need for future study is indicated. Plans for instrumentation being developed at AFGL to study the area are discussed. (Author)
Download or read book Spacecraft Charging at Geosynchronous Orbit written by Henry Berry Garrett and published by . This book was released on 1978 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid variations in spacecraft potential are observed on entry and exit from the earth's shadow. Generalized equations, based on elementary plasma probe theory, are developed which make quantitative estimates of these potentials as a function of satellite position in the earth's penumbra, and are compared with data from the ATS-5 and ATS-6 geosynchronous satellites. The agreement between the observations and the predictions results from the approximate constancy of the ratio of the ambient ion to electron current during injection events. Due to the significant size and shape differences of the ATS-5 and ATS-6 satellites, the results are applicable in many space physics situations such as estimating the effects of electron beams on satellite potential and of spacecraft charging on very large space structures. (Author).
Download or read book Spacecraft Charging at Geosynchronous Orbit written by Henry Berry Garrett and published by . This book was released on 1978 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid variations in spacecraft potential are observed on entry and exit from the earth's shadow. Generalized equations, based on elementary plasma probe theory, are developed which make quantitative estimates of these potentials as a function of satellite position in the earth's penumbra, and are compared with data from the ATS-5 and ATS-6 geosynchronous satellites. The agreement between the observations and the predictions results from the approximate constancy of the ratio of the ambient ion to electron current during injection events. Due to the significant size and shape differences of the ATS-5 and ATS-6 satellites, the results are applicable in many space physics situations such as estimating the effects of electron beams on satellite potential and of spacecraft charging on very large space structures. (Author)
Download or read book Effects of a Time varying Photoelectron Flux on Spacecraft Potential written by Henry Berry Garrett and published by . This book was released on 1978 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of plasma data from the geosynchronous satellites ATS-5 and ATS-6 shows that the satellites vary rapidly in potential as they pass into and out of the earth's shadow. These variations result from the loss of photoelectrons as the sun is eclipsed. A model of this phenomemon which includes the effects of atmospheric attenuation of the solar flux between 1000 A and 3000 A and spacecraft charge buildup is used to predict the potential variations observed by ATS-5 and ATS-6. The model predicts potentials within + or - 700 V of the observed potentials in the range -100 V to -10,000 V. (Author).
Download or read book Air Force Surveys in Geophysics written by and published by . This book was released on 1977 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preliminary Results of SERT II Spacecraft Potential Measurements Using Hot Wire Emissive Probes written by Sanford G. Jones and published by . This book was released on 1970 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Paper written by and published by . This book was released on 1984 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of a Time varying Photoelectron Flux on Spacecraft Potential written by Henry Berry Garrett and published by . This book was released on 1978 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of plasma data from the geosynchronous satellites ATS-5 and ATS-6 shows that the satellites vary rapidly in potential as they pass into and out of the earth's shadow. These variations result from the loss of photoelectrons as the sun is eclipsed. A model of this phenomemon which includes the effects of atmospheric attenuation of the solar flux between 1000 A and 3000 A and spacecraft charge buildup is used to predict the potential variations observed by ATS-5 and ATS-6. The model predicts potentials within + or - 700 V of the observed potentials in the range -100 V to -10,000 V. (Author)
Download or read book Normal pressure Tests of Circular Plates with Clamped Edges written by Albert E. McPherson and published by . This book was released on 1942 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fixture is described for making normal-pressure tests of flat plates 5 inches in diameter in which particular care was taken to obtain rigid clamping at the edges. Results are give for 19 plates, ranging in thickness from 0.015 to 0.072 inch. The center deflections and the extreme-fiber stresses at low pressures were found to agree with theoretical values; the center deflections at high pressures were 4 to 12 percent greater than the theoretical values. Empirical curves are derived of the pressure for the beginning of permanent set as a function of the dimensions of the plate and the tensile properties of the material.
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 1314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1979 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 1968 NASA Authorization written by United States. Congress. House. Committee on Science and Astronautics and published by . This book was released on 1967 with total page 1090 pages. Available in PDF, EPUB and Kindle. Book excerpt: Committee Serial No. 2. Considers H.R. 4450 and H.R. 6470, superseded by H.R. 10340, to provide FY68 authorizations for NASA RPD programs, including the Apollo Program, for construction of facilities at field centers, and for administrative operations.
Download or read book Physics Briefs written by and published by . This book was released on 1985 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Surgery for Cerebral Stroke written by Jiro Suzuki and published by Springer Science & Business Media. This book was released on 2013-12-01 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cerebral stroke is a common and widespread phenomenon affecting a large number of the human population worldwide. Various surgical methods have been developed for its treatment and the therapeutic results have steadily improved. This is a reassuring trend that promises further progress will be made in the future. This volume contains important contributions by leading clinicians and researchers in the field to the "International Symposium on Surgery for Cerebral Stroke" held in Sendai, Japan, May 24 - 27, 1987.
Download or read book The Autobiography of Nikola Tesla and Other Works written by Nikola Tesla and published by Simon and Schuster. This book was released on 2021-10-19 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: Who was Nikola Tesla? Find out in this comprehensive volume that includes Tesla’s autobiography and scientific writings, as well as other works that examine his life and career in detail. Nikola Tesla came from a humble upbringing in what is now Croatia and reached the heights of science and technology in the United States at the turn of the twentieth century. The Autobiography of Nikola Tesla and Other Works gives readers a compelling insight into the man whose ideas revolutionized the fields of electrical and mechanical engineering, and who continues to be a source of inspiration for modern inventors. This volume includes Tesla’s autobiography My Inventions (1919), articles and diagrams that he published in scientific magazines—including “The Problem of Increasing Human Energy,” in which he discusses the potential of solar power—and Thomas Commerford Martin’s The Inventions, Researches, and Writings of Nikola Tesla. A scholarly introduction examines Tesla’s life and career, and the impact that he has had on generations of inventors up to the present day.
