1,720,986 research outputs found
Sixth International Conference on Mars : July 20-25, 2003, Pasadena, California
No full textCalifornia Institute of Technology, Jet Propulsion Laboratory, Lunar and Planetary Institute, National Aeronautics and Space Administration, Planetary Society.sponsored by California Institute of Technology [and others] ; scientific organizer, Arden Albee ; conveners, Hugh Kieffer [and others] ; compiled by Lunar and Planetary Institute.PARTIAL CONTENTS: Evolution of the Martian Crust as Derived from Surface Measurements by Mars Odyssey, Other Space Missions, and Martian Meteorites / G. Dreibus, J. Brckner, W.V. Boynton -- Layered Outcrops on Mars / M.C. Malin -- Geological History of Water on Mars / V.R. Baker -- Cerberus Plains Volcanism: Constraints on Temporal Emplacement of the Youngest Flood Lavas on Mars / P.D. Lanagan, A.S. McEwen -- Martian Global Surface Mineralogy from the Thermal Emission Spectrometer: Surface Emissivity, Mineral Map, and Spectral Endmember Data Products / J.L. Bandfield -- NASAs Mars Exploration Program: Scientific Strategy / J.B. Garvin, D.J. McCleese -- TES Limb-Geometry Observations of Aerosols / M.D. Smith
The Analysis of Extraterrestrial Materials [Book Review]
Full text linkAs implied by its title, this book primarily concerns the actual analysis of extraterrestrial materials (including atmospheres and solar wind) rather than the results of such analyses. Five chapters deal with analysis of these materials in terrestrial laboratories, and six chapters describe remote analysis on spacecraft missions. Most chapters can be easily dated — they were written shortly after the mission, have undergone only sporadic updating, and are largely illustrated by copies of vu-graphs presented at National Aeronautics and Space Administration (NASA) briefings. This historical approach is quite successful in describing the original lunar receiving laboratory and instruments from specific missions. These chapters bring together good and readable descriptions of instruments from the Surveyor, Apollo, Viking, Pioneer, Venus, and especially the Soviet Lunakhod and Venera missions. The author participated in a number of the investigations involving gamma ray or X ray fluorescence spectrometry, and these sections are especially good. However, the chapters on meteorites, lunar samples, cosmochronology, and reflectance spectroscopy are too dated and should have been completely rewritten to properly convey current research and understanding
Foreword [to special section on Mars Observer]
Full text linkThe Mariner and Viking missions have explored Mars and have removed much of the mystery that has intrigued mankind for centuries. This knowledge allows scientists to pose complex questions about the origin, surface history, magnetic field and interior, atmosphere, and climate
of Mars. We know enough to pose such questions, typically based on a single data set, but we do not have additional data sets with which to test these questions. Mars Observer was conceived as a mission whose observations would constitute a synergistic army of data sets that would be readily available to the global community of planetary scientists. It provides a low, Sun-synchronous, polar orbit about the planet from which the entire surface and atmosphere can be repetitively observed and mapped by remote sensing instruments for an entire Mars year. This long period of continuous observations promises a rich harvest of global and seasonal information. It will provide a basic understanding of Mars as it exists today and a framework for understanding its past. Mars Observer stands between the initial exploration of Mars and the more intensive
Explorations, possibly involving human beings, that are only now being planned
Mission to Mars to Collect a Storehouse of Scientific Data
Full text linkJust after Election Day, the Mars Global
Surveyor spacecraft (Figure 1) will embark
on a journey to Mars to examine the surface
and the seasonal variations of the atmosphere
over an entire Mars year. Mars is an extremely
rich mission target because the
scientific questions it poses touch on geology,
geophysics, geochemistry, atmospheric
physics, climatology, biology, and—most of
all—comparative planetology
Introduction to the special section: The Mars Global Surveyor mission
Full text linkSince the launch of Mars Global Surveyor (MGS) in November 1996, it has returned more information about Mars than all previous missions combined. The scientific impact of MGS has been extraordinary. In many ways we now know Mars to be a very different planet than when MGS arrived in 1997. MGS has provided daily global and high resolution images, a global topographic model better than for Earth, a corresponding gravity model, and a magnetic field model, has mapped the surface composition, and has monitored the atmosphere
Mantle dynamics and geodesy
Full text linkBoth completed work and work that is still in progress are presented. The completed work presented includes: (1) core-mantle boundary topography; (2) absolute value for mantle viscosity; (3) code development; (4) lateral heterogeneity of subduction zone rheology; and (5) planning for the Coolfront meeting. The work presented that is still in progress includes: (1) geoid anomalies for a chemically stratified mantle; and (2) geoid anomalies with lateral variations in viscosity
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Interview with Arden Albee
Full text linkAn interview series in three sessions, in August–September 2017, with Arden Albee, professor of geology and planetary science, emeritus, and a key figure in lunar and Martian exploration throughout the ’70s, ’80s, and ’90s. Raised in Michigan, where his early interest in rocks and natural history was nurtured by road trips through the American west, he earned his undergraduate and graduate degrees in geology at Harvard and worked for the US Geological Survey before joining the Caltech faculty in 1959.
At Caltech he pioneered the use of the electron microprobe in petrological studies with colleagues A. Chodos and E. A. Bence, pursued fieldwork in numerous locales, including Greenland, where he and Caltech colleague G. Wasserburg took part in the landmark Oldstone Project to collect and analyze the world’s most ancient rocks, and collaborated in characterizing and dating the moon rocks returned by the Apollo missions.
From 1978 to 1984, he was JPL chief scientist during a transformative period in the lab’s history under successive directors B. Murray and L. Allen. He chaired numerous NASA planetary exploration committees and served as project scientist for the Mars Observer mission and as mission scientist for Mars Global Surveyor. His lengthy tenure, not without controversy, as Caltech’s dean of graduate studies from 1984 to 2000 and his two decades chairing the house committee of the Caltech faculty club, the Athenaeum, are also recounted in this oral history
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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