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Articles 391 - 411 of 411

Full-Text Articles in The Sun and the Solar System

Realistic Orbits About The Martian Moons, Samuel R. Bryant Dec 1990

Realistic Orbits About The Martian Moons, Samuel R. Bryant

Theses and Dissertations

Orbits about the Martian moons, Phobos and Deimos, previously found to be stable by the Poincare surface of section technique in a restricted three- body system, were investigated with non-zero eccentricity of the moons added to the dynamics of the planar four-body system (Mars, moon sun, artificial satellite). Although not strictly applicable to this case, the surface of section technique was used to verify whether or not the previously found stable orbits were realistic when a real world perturbation was added to the system dynamics. The surface of section technique involves the numerical integration of several orbits with the same …

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Substitution Of Non Commercial Cooking Energy By Solar Energy In Rural Areas: An Input And Output Approach, J P Painuly Jul 1986

Substitution Of Non Commercial Cooking Energy By Solar Energy In Rural Areas: An Input And Output Approach, J P Painuly

IIMB Management Review

No abstract provided.

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Geodesic Orbits About An Axisymmetric Mass Distribution, David J. Dean May 1985

Geodesic Orbits About An Axisymmetric Mass Distribution, David J. Dean

Honors Theses

The General Theory of Relativity (GRT) gives rise to many interesting questions, one of which is a question about how test particles orbit various relativistic mass configurations. A test particle is defined as an electrically neutral particle small enough that its self gravitating energy, as calculated using standard Newtonian theory, can be neglected when compared with the particle's rest mass, ie. M/R << 1. (Here M is the mass of the particle in meters, and R is the radius of the particle again in meters. The mass of the sun in these units is 1.47 km.) For example, the earth, which can be considered a test particle for the sun, travels about the sun in an elliptic orbit. What would happen if the sun suddenly became a black-hole? How would the earth's orbit be affected? It is the purpose of this paper to answer these questions not only for the case of the spherical black-hole (which has been extensively studied), but also for the case of an axisymmetric mass distribution idealized by a long thin rod-like mass (which will henceforth be referred to as a line mass). The classical case and relativistic case concerning orbits about the line mass will be discussed, along with some interesting features of the relativistic line mass orbits. Some background information concerning GRT will be needed before the problem of line mass is approached.

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Observations Of Shadow Bands At The Total Solar Eclipse Of 16 February 1980, Laurence A. Marschall, Rita Mahon, Richard C. Henry Dec 1984

Observations Of Shadow Bands At The Total Solar Eclipse Of 16 February 1980, Laurence A. Marschall, Rita Mahon, Richard C. Henry

Physics and Astronomy Faculty Publications

Photoelectric observations of short term light variations (shadow bands) at the 16 Feb. 1980 total solar eclipse have been made using a set of spatially separated PIN diodes. Light variations in a bandpass of 1-500 Hz were detected during the half-minutes preceding and following the total phase. Fourier analysis of the noise spectrum of the variations reveals a sharp drop-off for frequencies about 50 Hz and an overall spectrum quite similar to previously reported power spectra of stellar scintillation. This is consistent with an atmospheric origin for the shadow bands. Cross-correlations between the detector outputs are low, suggesting a short …

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Development Of A Mass Spectrometer System For The Measurement Of Inert Gases In Meteorites, Russel L. Palma Sep 1983

Development Of A Mass Spectrometer System For The Measurement Of Inert Gases In Meteorites, Russel L. Palma

Physics and Astronomy Department Publications

No abstract provided.

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Environmental Impact Of Solar Variability, Richard G. Hodgson Sep 1982

Environmental Impact Of Solar Variability, Richard G. Hodgson

Pro Rege

No abstract provided.

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Classroom Demonstration Of Sunspots, Thomas O. Callaway, Harry D. Downing, Glen T. Clayton Jan 1982

Classroom Demonstration Of Sunspots, Thomas O. Callaway, Harry D. Downing, Glen T. Clayton

Faculty Publications

No abstract provided.

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"Space Settlements", John Billingham Jun 1978

"Space Settlements", John Billingham

Special Collections: Oregon Public Speakers

No abstract provided.

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"Address To Faculty And Students", Timothy Francis Leary Jun 1977

"Address To Faculty And Students", Timothy Francis Leary

Special Collections: Oregon Public Speakers

Dr. Leary's first speech at Portland State University was ten years prior to this date. The recording of his 1967 talk was stolen from the Portland State library.

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"The Search For Extra-Terrestrial Life", Donald L. Devincenzi Oct 1975

"The Search For Extra-Terrestrial Life", Donald L. Devincenzi

Special Collections: Oregon Public Speakers

No abstract provided.

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Mercurio: El Redescubrimiento De Un Planeta, Aldemaro Romero Jr. Jan 1974

Mercurio: El Redescubrimiento De Un Planeta, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

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Júpiter: Sencillamente Fantástico, Aldemaro Romero Jr. Jan 1974

Júpiter: Sencillamente Fantástico, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

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Ionization Of Carbon And Nitrogen In The Intercloud Medium, Menas Kafatos, H. Gerola, S. Hatchett, R. Mccray Jan 1974

Ionization Of Carbon And Nitrogen In The Intercloud Medium, Menas Kafatos, H. Gerola, S. Hatchett, R. Mccray

Mathematics, Physics, and Computer Science Faculty Articles and Research

If the intercloud medium in the solar neighborhood was suddenly ionized less than 106 years ago, the subsequent relaxation of the gas can account for the very low observed column density of C III and N III yet still leave a significant fraction ("'0.05) of ionized hydrogen and of C I in a cold (T ≈ 20° K) intercloud medium. The OAO-C Copernicus observations in the direction of X Sco are consistent with cosmic abundances and a uniform-density medium, except for C III whose predicted column density from the C m ionization zone surrounding the star is a factor ~1Q …

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Ua66/12 Hardin Planetarium General Program Schedule, Wku Hardin Planetarium Jan 1971

Ua66/12 Hardin Planetarium General Program Schedule, Wku Hardin Planetarium

WKU Administration Documents

Program schedule for Hardin Planetarium.

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Ua11/2 Plantarium Director Warns Of Eye Damages During Saturday Eclipse, Wku Public Affairs Mar 1970

Ua11/2 Plantarium Director Warns Of Eye Damages During Saturday Eclipse, Wku Public Affairs

WKU Administration Documents

WKU press release entitled: Planetarium Director Warns of Eye Damages During Saturday Eclipse.

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Ua11/2 Planetarium Program To Describe The Moon In February Sessions, Wku Public Affairs Feb 1970

Ua11/2 Planetarium Program To Describe The Moon In February Sessions, Wku Public Affairs

WKU Administration Documents

Press release entitled: Planetarium Program to Describe the Moon in February Sessions.

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"Planetary Exploration (Lecture Two)", Carl Sagan Mar 1968

"Planetary Exploration (Lecture Two)", Carl Sagan

Special Collections: Oregon Public Speakers

Requested by: "Standing order from Science" "Planetary Exploration"

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"Planetary Exploration (Lecture One)", Carl Sagan Mar 1968

"Planetary Exploration (Lecture One)", Carl Sagan

Special Collections: Oregon Public Speakers

No abstract provided.

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Ua94/6/2/7 Physiography Notebook, Carl Ellis Jan 1911

Ua94/6/2/7 Physiography Notebook, Carl Ellis

Student/Alumni Personal Papers

Atlas Science Table for Laboratory Notes and Drawings in Physiography notebook used by Carl Ellis for Robert Green's class.

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Ua94/6/2/14 Physiography Notebook, Annie Reis Jan 1910

Ua94/6/2/14 Physiography Notebook, Annie Reis

Student/Alumni Personal Papers

Physiography notebook kept by student Annie Reis in 1910. Notebook includes notes and drawings related to physical geography such as solar systems, rivers, faults, weather and glaciers.

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The Physical Character Of The Sun, J. F. Downey Dec 1882

The Physical Character Of The Sun, J. F. Downey

Journal of the Minnesota Academy of Science

No abstract provided.

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