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  • LUNAR AND PLANETARY EXPLORATION  (3,082)
  • Engineering  (2,589)
  • 2005-2009  (58)
  • 1985-1989  (5,613)
Collection
Language
Years
Year
  • 1
    Keywords: Engineering ; Laser physics ; Microwaves ; Optical materials ; Physical optics
    ISBN: 9780387686172
    Language: English
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  • 2
    Keywords: Chemistry, Physical organic ; Chemistry, inorganic ; Condensed matter ; Engineering ; Materials ; Structural control (Engineering)
    ISBN: 9781402034718
    Language: English
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  • 3
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    Berlin, Heidelberg : Springer
    Keywords: Condensed matter ; Engineering ; Nanotechnology ; Surfaces (Physics)
    ISBN: 9783540343158
    Language: English
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  • 4
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    Berlin, Heidelberg : Springer
    Keywords: Engineering ; Optical materials ; Particles (Nuclear physics) ; Physical optics
    ISBN: 9783540745297
    Language: English
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  • 5
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    Berlin, Heidelberg : Springer
    Keywords: Chemistry, Physical organic ; Engineering ; Nanotechnology ; Surfaces (Physics)
    ISBN: 9783540745518
    Language: English
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  • 6
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    Boston, MA : Kluwer Academic Publishers
    Keywords: Engineering ; Materials
    ISBN: 9781402081330
    Language: English
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  • 7
    Keywords: Computer science ; Engineering ; Materials ; Nuclear engineering ; Thermodynamics
    ISBN: 9781402084225
    Language: English
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  • 8
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    Totowa, NJ : Humana Press
    Keywords: Biochemical engineering ; Biotechnology ; Chemical engineering ; Engineering ; Environmental sciences ; Microbiology
    ISBN: 9781592599967
    Language: English
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  • 9
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    Berlin, Heidelberg : Springer
    Keywords: Condensed matter ; Engineering ; Nanotechnology
    ISBN: 9783540726753
    Language: English
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  • 10
    Keywords: Building construction ; Engineering ; Materials ; Physics
    ISBN: 9781852334277
    Language: English
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  • 11
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    Berlin, Heidelberg : Springer
    Keywords: Analytical biochemistry ; Biotechnology ; Engineering ; Food science ; Medical laboratories
    ISBN: 9783540457435
    Language: English
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  • 12
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    Berlin, Heidelberg : Springer
    Keywords: Computer engineering ; Engineering ; Nanotechnology ; Optical materials ; Physical optics ; Quantum optics
    ISBN: 9783540469360
    Language: English
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  • 13
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    Boston, MA : Springer
    Keywords: Engineering ; Machinery ; Materials
    ISBN: 9780387725284
    Language: English
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  • 14
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    New York, NY : Springer
    Keywords: Engineering ; Optical materials ; Physical optics
    ISBN: 9780387748016
    Language: English
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  • 15
    Keywords: Electronics ; Engineering ; Nanotechnology ; Optical materials ; System safety
    ISBN: 9783540269458
    Language: English
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  • 16
    Keywords: Biochemistry ; Chemistry, Physical organic ; Engineering ; Life sciences ; Nanotechnology ; Physical optics
    ISBN: 9783540284727
    Language: English
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  • 17
    Keywords: Chemistry, Physical organic ; Engineering ; Nanotechnology ; Optical materials ; Physics
    ISBN: 9783540687528
    Language: English
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  • 18
    Keywords: Electronics ; Engineering ; Nanotechnology ; Thermodynamics
    ISBN: 9783540736073
    Language: English
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  • 19
    Keywords: Condensed matter ; Engineering ; Engineering design ; Materials ; Physics
    ISBN: 9780387345659
    Language: English
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  • 20
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    Boston, MA : Springer US
    Keywords: Chemistry ; Engineering ; Materials ; Mechanical engineering ; Surfaces (Physics)
    ISBN: 9780387476858
    Language: English
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  • 21
    Keywords: Condensed matter ; Engineering ; Materials ; Nanotechnology ; Optical materials
    ISBN: 9781402089039
    Language: English
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  • 22
    Keywords: Electromagnetism ; Engineering ; Laser physics ; Remote sensing
    ISBN: 9781402065033
    Language: English
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  • 23
    Keywords: Engineering ; Optical materials ; Physical optics
    ISBN: 9781402084256
    Language: English
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  • 24
    Keywords: Chemistry ; Engineering ; Magnetism ; Materials ; Optical materials
    ISBN: 9781402087967
    Language: English
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  • 25
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    Berlin, Heidelberg : Springer
    Keywords: Chemistry, inorganic ; Condensed matter ; Engineering ; Nanotechnology ; Surfaces (Physics)
    ISBN: 9783540368076
    Language: English
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  • 26
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    Berlin, Heidelberg : Springer
    Keywords: Engineering ; Magnetism ; Nanotechnology ; Optical materials
    ISBN: 9783540493365
    Language: English
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  • 27
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    Berlin, Heidelberg : Springer
    Keywords: Chemistry, Physical organic ; Condensed matter ; Engineering ; Optical materials
    ISBN: 9783540712954
    Language: English
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  • 28
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    Berlin, Heidelberg : Springer
    Keywords: Engineering ; Nanotechnology ; Particles (Nuclear physics)
    ISBN: 9783540745570
    Language: English
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  • 29
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    Berlin, Heidelberg : Springer
    Keywords: Chemistry ; Mathematics ; Engineering ; Operations research ; Systems theory
    ISBN: 9783540488804
    Language: English
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  • 30
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    Dordrecht : Springer
    Keywords: Chemicals ; Safety measures ; Engineering ; Materials ; Polymers
    ISBN: 9781402053566
    Language: English
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  • 31
    Keywords: Engineering ; Materials
    ISBN: 9781402085840
    Language: English
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  • 32
    Keywords: Electronics ; Engineering ; Optical materials ; Spectrum analysis
    ISBN: 9783540274124
    Language: English
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  • 33
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    Berlin, Heidelberg : Springer
    Keywords: Electronics ; Engineering ; Nanotechnology
    ISBN: 9783540283089
    Language: English
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  • 34
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    Berlin, Heidelberg : Springer
    Keywords: Electronics ; Engineering ; Optical materials ; Physical optics
    ISBN: 9783540718925
    Language: English
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  • 35
    Keywords: Condensed matter ; Engineering ; Optical materials
    ISBN: 9783540734567
    Language: English
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  • 36
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    Berlin, Heidelberg : Springer
    Keywords: Condensed matter ; Engineering ; Optical materials ; Surfaces (Physics)
    ISBN: 9783540264620
    Language: English
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  • 37
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    Berlin, Heidelberg : Springer
    Keywords: Condensed matter ; Engineering ; Nanotechnology
    ISBN: 9783540375784
    Language: English
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  • 38
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    Berlin, Heidelberg : Springer
    Keywords: Condensed matter ; Engineering ; Materials ; Nanotechnology ; Optical materials
    ISBN: 9783540401865
    Language: English
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  • 39
    Keywords: Chemistry, inorganic ; Engineering ; Materials
    ISBN: 9783540687580
    Language: English
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  • 40
    Keywords: Engineering ; Optical materials ; Particles (Nuclear physics) ; Physical optics ; Polymers
    ISBN: 9783540719236
    Language: English
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  • 41
    Keywords: Condensed matter ; Engineering ; Materials ; Nanotechnology ; Optical materials
    ISBN: 9781402035623
    Language: English
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  • 42
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    Berlin, Heidelberg : Springer
    Keywords: Condensed matter ; Engineering ; Magnetism ; Materials ; Nanotechnology
    ISBN: 9783540495765
    Language: English
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  • 43
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    Berlin, Heidelberg : Springer
    Keywords: Crystallography ; Engineering ; Particles (Nuclear physics) ; Surfaces (Physics)
    Edition: Third Edition
    ISBN: 9783540738862
    Language: English
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  • 44
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    Berlin, Heidelberg : Springer
    Keywords: Analytical biochemistry ; Chemistry ; Chemistry, Physical organic ; Engineering
    ISBN: 9783540745983
    Language: English
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  • 45
    Keywords: Engineering ; Materials ; Materials ; Materials ; Mechanics ; Nuclear engineering
    ISBN: 9781402053290
    Language: English
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  • 46
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    Nature Publishing Group (NPG)
    Publication Date: 2008-12-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schiermeier, Quirin -- England -- Nature. 2008 Nov 27;456(7221):540-1. doi: 10.1038/nj7221-540a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19112617" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Conservation of Natural Resources/trends ; *Ecosystem ; Employment/statistics & numerical data ; Engineering ; Greenhouse Effect ; Industry/manpower ; Marine Biology/manpower/trends ; Oceanography/education/*manpower/*trends ; Oceans and Seas ; Petroleum ; Physics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 47
    Publication Date: 2009-02-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tollefson, Jeff -- England -- Nature. 2009 Feb 19;457(7232):942-3. doi: 10.1038/457942b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19225485" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Engineering ; *Federal Government ; Fishes ; *Greenhouse Effect ; History, 20th Century ; History, 21st Century ; Hobbies/history ; Marine Biology ; Physics ; *Research Personnel ; United States ; United States Government Agencies/*organization & administration ; Wine
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 48
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2006-05-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Teich, Al -- White, Wendy D -- New York, N.Y. -- Science. 2006 May 5;312(5774):657.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16675666" target="_blank"〉PubMed〈/a〉
    Keywords: Engineering ; *Foreign Professional Personnel ; Humans ; *International Cooperation ; *Security Measures ; *Students ; Travel ; United States
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 49
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-04-14
    Description: We have used 19.9 million papers over 5 decades and 2.1 million patents to demonstrate that teams increasingly dominate solo authors in the production of knowledge. Research is increasingly done in teams across nearly all fields. Teams typically produce more frequently cited research than individuals do, and this advantage has been increasing over time. Teams now also produce the exceptionally high-impact research, even where that distinction was once the domain of solo authors. These results are detailed for sciences and engineering, social sciences, arts and humanities, and patents, suggesting that the process of knowledge creation has fundamentally changed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wuchty, Stefan -- Jones, Benjamin F -- Uzzi, Brian -- New York, N.Y. -- Science. 2007 May 18;316(5827):1036-9. Epub 2007 Apr 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Northwestern Institute on Complexity (NICO), Northwestern University, Evanston, IL 60208, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17431139" target="_blank"〉PubMed〈/a〉
    Keywords: *Authorship ; Bibliometrics ; Biomedical Research/statistics & numerical data/trends ; Databases as Topic/statistics & numerical data ; Engineering ; Humanities ; *Knowledge ; *Patents as Topic ; Publishing/statistics & numerical data/*trends ; Research/statistics & numerical data/*trends ; Sociology ; United States
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 50
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2008-11-22
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bolon, Craig -- New York, N.Y. -- Science. 2008 Nov 21;322(5905):1187. doi: 10.1126/science.322.5905.1187a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19023062" target="_blank"〉PubMed〈/a〉
    Keywords: Engineering ; Lawyers ; *Occupations ; Physicians ; Science
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 51
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2008-03-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Travis, John -- New York, N.Y. -- Science. 2008 Mar 28;319(5871):1750-2. doi: 10.1126/science.319.5871.1750.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18369115" target="_blank"〉PubMed〈/a〉
    Keywords: *Awards and Prizes ; *Commerce ; *Diffusion of Innovation ; Drug Industry ; Engineering ; *Internet ; *Problem Solving ; Research ; *Science
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 52
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2009-04-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, John D -- New York, N.Y. -- Science. 2009 Apr 17;324(5925):344-6. doi: 10.1126/science.1168085.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Mechanical and Industrial Engineering, University of Iowa, Iowa City, IA 52242, USA. jdlee@engineering.uiowa.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19372419" target="_blank"〉PubMed〈/a〉
    Keywords: *Attention ; *Automobile Driving ; Engineering ; Feedback ; Humans ; Risk ; *Safety ; *Technology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 53
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2005-06-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bhattacharjee, Yudhijit -- New York, N.Y. -- Science. 2005 Jun 17;308(5729):1722-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15961635" target="_blank"〉PubMed〈/a〉
    Keywords: Authorship ; *Aviation ; Commerce ; *Editorial Policies ; Engineering ; International Cooperation ; Iran ; Publishing ; Security Measures ; *Societies, Scientific ; United States
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 54
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2005-02-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mattick, John S -- Gagen, Michael J -- New York, N.Y. -- Science. 2005 Feb 11;307(5711):856-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉ARC Special Research Centre for Functional and Applied Genomics, Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland 4072, Australia. j.mattick@imb.uq.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15705831" target="_blank"〉PubMed〈/a〉
    Keywords: Computers ; Engineering ; Gene Expression Regulation ; Industry ; *Mathematics ; Software ; *Systems Biology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 55
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2006-10-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stokstad, Erik -- New York, N.Y. -- Science. 2006 Oct 27;314(5799):584.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17068235" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Conservation of Natural Resources ; *Ecosystem ; Engineering ; *Environment ; Geologic Sediments ; *Rivers ; *Salmon ; Trees ; Washington
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 56
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2006-10-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stokstad, Erik -- New York, N.Y. -- Science. 2006 Oct 27;314(5799):582-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17068234" target="_blank"〉PubMed〈/a〉
    Keywords: California ; Conservation of Natural Resources ; *Ecosystem ; Engineering ; *Environment ; *Fresh Water ; Plant Development ; Rivers ; Water Movements ; Water Supply
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 57
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2006-09-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gray, Briahna -- New York, N.Y. -- Science. 2006 Sep 8;313(5792):1382-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16959987" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Science Disciplines ; *Biomimetic Materials ; Biomimetics ; Computer Simulation ; Engineering ; *Fishes/physiology ; Interdisciplinary Communication ; Mathematics ; Pressure ; *Sense Organs/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 58
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2008-12-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alberts, Bruce -- New York, N.Y. -- Science. 2008 Dec 5;322(5907):1435. doi: 10.1126/science.1168790.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19056942" target="_blank"〉PubMed〈/a〉
    Keywords: Engineering ; *Government ; *Public Policy ; *Science ; United States
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 59
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    In:  Other Sources
    Publication Date: 2011-08-24
    Description: Present understanding of planetary atmospheres is surveyed. The formation of the planets and their atmospheres is briefly reviewed, and attention is given to the compositions of the atmospheres of earth, Venus, and Mars, the outer planets, and Titan. Lists of the individual atmospheric gases and their concentrations are included.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 60
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    In:  CASI
    Publication Date: 2004-12-04
    Description: This design course is directed to studying problems related to mobile exploration of the surface of Mars. Constraints on the vehicles considered are set by the payload and performance currently envisioned by mission analysis carried out previously at the Jet Propulsion Laboratory. The students are given full flexibility to examine those aspects which suit their interests and background. There are no regularly scheduled class lectures. Weekly review meetings are held with personnel from the Jet Propulsion Laboratory, and students use JPL resources as required.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: USRA, Agenda of the Third Annual Summer Conference, NASA(USRA University Advanced Design Program; p 11
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  • 61
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    In:  CASI
    Publication Date: 2005-07-19
    Description: The Moon is a body rich in natural resources and full of intriguing scientific questions, and it will most certainly play a central role in the growth of near-Earth and deep space ventures of the twenty-first century. The LOP mission is an example of one way to catalog the Moon's natural resources and to answer lunar science questions in parallel. In a realistic planetary exploration program, this mission must compete with other interesting planetary missions and therefore the LOP must be as low cost and adaptable as possible. This flexibility is reflected in the LOP's heavy design emphasis on modularity. The LOP mission can easily be expanded to include new technologies, and additional orbiters could be launched into lunar orbit to provide a constellation of remote-sensing platforms. This design thus projects a broad range of possibilities for continued lunar exploration in the next century.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: USRA, NASA(USRA University Advanced Design Program Fourth Annual Summer Conference; p 145-151
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  • 62
    Publication Date: 2005-11-10
    Description: Through the Surveyor 3 and 7, and Apollo 11-17 missions a knowledge of the mechanical properties of Lunar regolith were gained. These properties, including material cohesion, friction, in-situ density, grain-size distribution and shape, and porosity, were determined by indirect means of trenching, penetration, and vane shear testing. Several of these properties were shown to be significantly different from those of terrestrial soils, such as an interlocking cohesion and tensile strength formed in the absence of moisture and particle cementation. To characterize the strength and deformation properties of Lunar regolith experiments have been conducted on a lunar soil simulant at various initial densities, fabric arrangements, and composition. These experiments included conventional triaxial compression and extension, direct tension, and combined tension-shear. Experiments have been conducted at low levels of effective confining stress. External conditions such as membrane induced confining stresses, end platten friction and material self weight have been shown to have a dramatic effect on the strength properties at low levels of confining stress. The solution has been to treat these external conditions and the specimen as a full-fledged boundary value problem rather than the idealized elemental cube of mechanics. Centrifuge modeling allows for the study of Lunar soil-structure interaction problems. In recent years centrifuge modeling has become an important tool for modeling processes that are dominated by gravity and for verifying analysis procedures and studying deformation and failure modes. Centrifuge modeling is well established for terrestrial enginering and applies equally as well to Lunar engineering. A brief review of the experiments is presented in graphic and outline form.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: First Annual Symposium. Volume 1: Plenary Session; 14 p
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  • 63
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    In:  CASI
    Publication Date: 2006-02-14
    Description: Spectroscopic and spectrophotometric data on the atmospheres of comets, the outer planets, and Titan at ultraviolet to near-infrared wavelengths were acquired. These data support an effort aimed at characterizing the physical properties and distribution of aerosol particles in the atmospheres of these bodies. New spectrophotometry was acquired of Uranus at 0.2 lambda 0.3 micrometer with IUE; archival IUE spectrophotometry of Uranus and Neptune in this wavelength range was acquired and recalibrated. New estimates of radiometric Bond albedos and global energy budges of Uranus, Neptune and Titan were published.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 19
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  • 64
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    In:  CASI
    Publication Date: 2006-02-14
    Description: Infrared observations were made of the outer planet satellites. These data provide vital information about the thermophysical properties of satellite surfaces, including internal heat sources for Io. Observations include both broad and narrow band measurements in the 2 to 20 micrometer spectral range. Types of observation and target priority were determined to make maximum use of existing data from Voyager and other missions, on-going and planned missions such as Galileo, were supported and techniques and data for planning new missions and instrumentation were developed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 38
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  • 65
    Publication Date: 2006-02-14
    Description: Telescopic observations were made of gases and plasmas in the Jupiter system, and related phenomena such as the recently-discovered sodium atmosphere of Mercury. Sodium absorption in Io's atmosphere was observed to distances as large as 5 Io radii during the mutual-eclipse season of the Jovian satellites. Analysis of Jovian disk spectra has proceeded, as planned, from an emphasis on the H2 ortho-para ratio to analysis of methane absorptions and determination of cloud structure. Several 2-channel photometers were constructed in 1978 for the Uranus event at which the rings were discovered and a smaller, single-channel unit was built more recently. Although the photometers themselves are still fully usable, the data-acquisition systems have major deficiencies.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 34-35
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  • 66
    Publication Date: 2006-02-14
    Description: It is proposed to measure the reflectance spectra of the icy satellites of Jupiter, Saturn and Uranus in the spectral region 1.8 to 2.4 micrometers. These observations use the new Cooled Grating Array Spectrometer using a 32-element InSb photodiode array detector and produce spectra of higher resolution and precision than any data yet obtained; the ultimate scientific objective is to search for the signatures of methane clathrate, ammonium hydroxide or carbon monoxide clathrate (compounds predicted to exist on icy surfaces in the outer solar system by several theories of formation of these bodies) in the region of the spectrum where water ice has a relative maximum in reflectance. At the very least, these data will allow upper limits to be placed on the amount of these chemical species that can be present. The specific targets is Europa, Ganymede, Enceladus, Ariel and Titania, bodies that have the highest probability of having some or all of these volatiles on their surface according to current formation models.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 20
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  • 67
    Publication Date: 2006-02-14
    Description: In order to understand the origin and distribution of the biogenic elements and their compounds in the solar system, it will be necessary to study material from many classes of objects. Chemical, elemental, and isotopic measurements of returned samples of comets, asteroids, and possibly extra-solar system dust clouds would provide information on a particularly important class: the primitive objects. Extraterrestrial micron-sized particles in the vicinity of earth are one source of such materials that might otherwise be inaccessible. The Space Station appears to be an eminently suitable platform from which to collect and detect these various particles. The primary challenge, however, is to collect intact, uncontaminated particles which will be encounted at tens of kilometers per seconds. A concept for a micrometeoroid detector that could be deployed at a Space Station has been developed which uses a large area detector plate implanted with acoustic transducers. When an impact event occurs, the resulting signal is subjected to spectral analysis providing positive detection, momentum information, and angle of incidence. The primary advantage of this detector is the large area which increases the probability of measuring events.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Second Symposium on Chemical Evolution and the Origin and Evolution of Life; p 59
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  • 68
    Publication Date: 2006-02-14
    Description: The recent Voyager flyby of Titan produced evidence for at least nine organic compounds in that atmosphere that are heavier than methane. Several models of Titan's atmosphere, as well as laboratory simulations, suggest the presence of organics considerably more complex that those observed. To ensure that the in situ measurements are definitive with respect to Titan's atmosphere, experiment concepts, and the related instrumentation, must be carefully developed specifically for such a mission. To this end, the possible composition of the environment to be analyzed must be bracketed and model samples must be provided for instrumentation development studies. Laboratory studies to define the optimum flight experiment and sampling strategy for a Titan entry probe are currently being conducted. Titan mixtures are being subjected to a variety of energy sources including high voltage electron from a DC discharge, high current electric shock, and laser detonation. Gaseous and solid products are produced which are then analyzed. Samples from these experiements are also provided to candidate flight experiments as models for instrument development studies. Preliminary results show that existing theoretical models for chemistry in Titan's atmosphere cannot adequetely explain the presence and abundance of all trace gases observed in these experiments.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Second Symposium on Chemical Evolution and the Origin and Evolution of Life; p 52
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  • 69
    Publication Date: 2006-02-14
    Description: The Voyager 1 and Voyager 2 narrow angle cameras have been imaging Uranus and Neptune (through several filters) from distances of several AU for the past four years. The justification for this is to determine the way in which the albedoes of the two planets vary with angle from the sun. The Voyager 1 spacecraft has already reached a phase angle of approx. 40 deg. for Neptune and approx. 70 deg. for Uranus. The albedo of a gaseous planet depends on the phase angle (angle from the sun through the planet to the observer), the color being observed, and the vertical distribution and nature of aerosols and clouds in the atmosphere of the planet. Since the colors are known and the phase angles, and phase curves will be used to constrain models of the aerosol and cloud structrures of Uranus and Neptune. A knowledge of the way albedo varies with phase angle allows one to compute the total amount of sunlight being absorbed by a planet. With knowledge of the solar flux incident on the planet and knowledge of how much infrared is being emitted by the planet (at least in the direction of the Earth and sun) one can determine a rough extimate of the internal heat source of the planet. Although Jupiter and Saturn have measured internal heat sources of magnitude comparable to their absorbed energy from the sun, preliminary results indicate that Uranus may not have an internal heat and that Neptune if it has one that heat source is small.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 64
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  • 70
    Publication Date: 2006-02-14
    Description: Narrowband CCD profiles of C2 and grains in several comets (including P/Halley and P/Giacobini-Zinner) were performed. Rotational light curves were made of Comet P/Arend-Rigaux (visible and infrared) yielding the size, shape, albedo, and rotation period of the nucleus. Production rates were measured as a function of heliocentric distance for OH, CN, and C2 in P/Giacobini-Zinner and for OH, NH, CN, C3, and C2 in P/Halley. Detection and measurement was made of forbidden (O I) lines near 6300 and 5577 A in P/Halley, permitting the production rate of oxygen from CO to be distinguished from that from H2O. Identification of C-12C-13 lines in cometary spectra indicating a possible enrichment of C-13 over the telluric value was made. An assessment of techniques for detecting (determining the existence of) a trans-Neptunian comet belt is included.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 68-70
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  • 71
    Publication Date: 2006-02-14
    Description: The Voyager data in a newly produced noise-reduced and recalibrated format has been received. New color spectrograms were developed on high resolution color terminals which display this data. The production of these new spectrograms utilizing the new format data is quite important, because it eliminates a serious problem of noise contamination and miscalibration in the old data set. In addition, a new Jovian plasma model was introduced, which includes the Io torus and accounts for 7 ionic species. The new plasma model is important in the ray tracing of hectometric (HOM) and kilometric (KOM) radiation which may be influenced by the Io torus.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 44-45
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  • 72
    Publication Date: 2006-02-14
    Description: A multi-color, broad-band photographic program for monitoring atmospheric variability of Jupiter and Saturn with the 61-cm, f/75 telescope was continued. The archivial product consists of approximately 20 sequential images on 3 1/4 x 4 1/4 glass plates with a plate scale of 4.53 arc sec/mm. An eleven-step sensitometric wedge, recorded times of acquisition, and fiducial marks which determine the orientation of the plate, are recorded on each individual plate. This allows accurate positional measurements, as well as detailed relative surface brightness determinations. Detailed measurements of the Red Spot are being utilized in a study of zonal velocity variation and the ability to predict the longitude of the Red Spot during the Galileo mission. An ongoing 5-color series of Saturn has been maintained to map the seasonal changes in the belt-zone reflectivity. Digitization of a series of blue images containing the Red Spot and a series of red and blue images excluding the Red Spot are being processed and reduced to normalized surface brightness maps. This data is being utilized to map time-dependent brightness variations of selected features, belts, and ones.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 17-18
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  • 73
    facet.materialart.
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    In:  CASI
    Publication Date: 2006-02-14
    Description: The interior structure of the Jovian planets was studied by means of observational data obtained by ground-based astronomy. Recent work was oriented toward a determination of oblateness from occultation measurements of the shape of planetary atmospheres. This provides a determination of the degree of central condensation of the planet, which is then compared with interior models and theoretical equations of state. As a serendipitous result of the attempts to measure the oblateness of Neptune, a partial Neptune ring (or arc) was discovered following an occultation observation on July 22, 1984. During 1985, older observations were reexamined to determine whether Neptune arcs had been detected (but not identified) during previous occultations. It appears that Neptunian arcs may locally imitate Uranian rings, with an 1981 event resembling Uranus' epsilon ring, while an 1984 event was more similar to the thinner Uranian rings such as the alpha ring.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 32-33
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  • 74
    facet.materialart.
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    In:  CASI
    Publication Date: 2006-02-14
    Description: This program supports NASA's deep space exploration missions, particularly those to the outer Solar System, and also NASA's Earth-orbital astronomy missions, using ground-based observations, primarily with the NASA IRTF at Mauna Kea, Hawaii, and also with such instruments as the Kitt Peak 4 meter Mayall telescope and the NRAO VLA facility in Socorro, New Mexico. An important component of the program is the physical interpretation of the observations. There were two major scientific discoveries resulting from 8 micrometer observations of Jupiter. The first is that at that wavelength there are two spots, one near each magnetic pole, which are typically the brightest and therefore warmest places on the planet. The effect is clearly due to precipitating high energy magnetospheric particles. A second ground-based discovery is that in 1985, Jupiter exhibited low latitude (+ or - 18 deg.) stratospheric wave structure.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 21-22
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  • 75
    Publication Date: 2006-02-14
    Description: The research effort was concentrated toward comet P/Halley, although observations of other comets including Giacobini-Zinner, Hartley-Good and Thiele were made as opportunities arise. In preparing for the apparition of P/Halley, detailed predictions for the emission in the 18 cm OH transitions were made in order to assist observers and to indicate what type of data would be particularly valuable. Likewise, since occultations by the comet of background radio sources can provide unique types of information, the tracks of P/Halley and P/Giacobini-Zinner were surveyed with the NRAO Very Large Array, background sources were mapped, and a catalogue of occulted sources published. Beginning in September, 1985, regular observations of the 18 cm OH lines have been made for P/Halley using the 43 m antenna of the NRAO in Greenbank, West Virginia. These data promise to provide the most accurate time sequence for the OH emission for any comet ever obtained at radio wavelengths. From the linewidth and shape, information is obtained on the kinetics of the gas in the cometary coma. An extensive series of observations have been undertaken with 14 m antenna to study emission from the HCN molecule in P/Halley. These data provide the first definitive detection of this component of the cometary ices. Interesting variations in the production of HCN were observed with time scales less than a day. Likewise, there appeared to be variations in the ratio of the hyperfine components of the J = 1-0 transition.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 96-97
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  • 76
    Publication Date: 2006-02-14
    Description: Work completed on Apollo 14 basalts has been published. The two dates obtained from these rocks comprised the oldest and two of the three oldest ages (4.1 and 4.3 billion years) known for lunar maria basalts; thus their ages are important in understanding the moon's earliest history. Owing to the antiquity of these rocks, two more fragments have been dated as part of a second ASEE/NASA SFF program. The new ages are 3.95 and 4.12 billion years, thus further establishing and amplifying the earlier results. This work, although perhaps more interesting for its chronologic information, was begun as a test of chemical and petrographic models. Fragments of Apollo basalt were placed into five categories, based on petrologic and chemical, especially rare-earth element, composition. Isotopic studies were begun in an attempt to determine if the five groups of basalts were related by age or initial isotopic composition (isotopic composition of lava at time of extrusion). Although a few of the representatives of the five groups have the same age and/or initial strontium-isotopic composition, within the analtytical uncertainties, most apparently are unrelated. Petrologic implications of these data will be published in an appropriate journal.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Johnson Space Center NASA/American Society for Engineering Educatio; NASA. Johnson Space
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  • 77
    Publication Date: 2006-02-14
    Description: One aspect of the study of Titan's atmosphere is the elucidation of the chemical and physical nature of the aerosols. In order to facilitate this, a program to produce laboratory synthesized model materials for Titan's aerosol and to study their chemical and physical properties is now in progress. Various processes, including electric discharge, photolysis by ultraviolet light, and irradiation by energetic particles, will be used to produce the materials. A first set of experiments where a nominal Titan mixture (97%N2, 3% CH4, 0.2% H2) was subjected to pulsed high temperature shocks yielded a reddish brown waxy solid. This material was subjected to pyrolysis/gas chromatography, a technique that has been proposed as a method for analysis of the Titan aerosols. Preliminary results show the material to consist of simple hydrocarbons but little else, at least up to temperatures of 600 C. Since the material was colored, compounds other than those mentioned above must be present.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Second Symposium on Chemical Evolution and the Origin and Evolution of Life; p 50
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  • 78
    facet.materialart.
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    In:  CASI
    Publication Date: 2005-07-19
    Description: The establishment of lunar bases is the next logical step in the exploration of space. Permanent lunar bases will support scientific investigation, the industrialization of space, and the development of self-sufficiency on the Moon. Scientific investigation and research and development would lead to applications utilizing lunar material resources. By utilizing these resources, the industrialization of space can become a reality. The above two factors coupled with the development of key and enabling technologies would lead to achievement of self-sufficiency of the lunar base. Attention was focused on specific design(s) to be pursued during subsequent stages in advanced courses. Some of the objectives in the project included: (1) minimizing the transportation of construction material and fuel from earth, or maximizing the use of the lunar material; (2) use of novel materials and light weight structures; (3) use of new manufacturing methods and technology such as magnetically levitated, or superconducting materials; and (4) innovative concepts of effectively utilizing the exotic lunar conditions, i.e. high thermal gradients, lack of atmosphere, zero wind forces, and lower gravity, etc.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: USRA, NASA(USRA University Advanced Design Program Fourth Annual Summer Conference; p 89-92
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  • 79
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    In:  Other Sources
    Publication Date: 2011-08-19
    Description: Nonthermal radio emissions from earth, Jupiter, Saturn, and Uranus are reviewed. The dominant source of emission at each planet appears to be AKR-like auroral emission in the X-mode. O-mode emissions are substantially responsible. There is a remarkably constant scaling factor relating the total solar wind input power into each planetary system and the AKR-like auroral emissions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 80
    Publication Date: 2011-08-19
    Description: This article presents the results of a fit of a model of the Martian satellite orbits to earthbased and spacecraft-based observations. An assessment of the orbit accuracies is given and the orbits are compared with those obtained by previous investigators.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 225; 2, No
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  • 81
    Publication Date: 2011-08-19
    Description: The petrology and chronology of early lunar crust is examined using the least equivocal of the available petrographic and age data on lunar rock samples, and the possible processes which produced the lunar crust are discussed. The results suggest that the lunar anorthositic crust was formed by about 120 Ma after the primary accretion of the moon at 4.56 Ga. At least some members of the diverse Mg-suites of rocks, such as norites, troctolites, and dunites, crystallized within a very few 100s of Ma after 4.56 Ga. A trace-element-rich material (KREEP) was formed by about 4.3 Ga ago, and this residue was subsequently reworked in melting and impact processes such that most samples which contain it have ages around 3.9-4.0 Ga. The findings also suggest that the onset of ferrous mare basalt volcanism began about 4.33 Ga, much earlier than was once assumed, and was still in process before the end of the most intense period of bombardment (3.9-4.0 Ga ago).
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Tectonophysics (ISSN 0040-1951); 161; 157-164
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  • 82
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    Publication Date: 2011-08-19
    Description: The findings made by the Voyager 2 Neptune encounter are reviewed. Data on the bowshock, magnetic field, magnetosphere, rings, plasma sheet, aurora, moons, and dust of Neptune are discussed. Findings made concerning Triton are summarized.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: EOS (ISSN 0096-3941); 70; 915-921
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  • 83
    Publication Date: 2011-08-19
    Description: The composition of lunar regolith and its attendant properties are discussed. Tables are provided listing lunar minerals, the abundance of plagioclase feldspar, pyroxene, olivine, and ilmenite in lunar materials, typical compositions of common lunar minerals, and cumulative grain-size distribution for a large number of lunar soils. Also provided are charts on the chemistry of breccias, the chemistry of lunar glass, and the comparative chemistry of surface soils for the Apollo sites. Lunar agglutinates, constructional particles made of lithic, mineral, and glass fragments welded together by a glassy matrix containing extremely fine-grained metallic iron and formed by micrometeoric impacts at the lunar surface, are discussed. Crystalline, igneous rock fragments, breccias, and lunar glass are examined. Volatiles implanted in lunar materials and regolith maturity are also addressed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 84
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    Publication Date: 2011-08-19
    Description: Theoretical models of planetary-ring dynamics are discussed in a detailed analytical review and illustrated with graphs and diagrams. The streamline concept is introduced, and the phenomena associated with the transport of angular momentum are described. Particular attention is then given to (1) broad rings like those of Saturn (shepherding, density-wave excitation, gaps, bending-wave excitation, multiringlet structures, inner-edge shepherding, and the possibility of polar rings around Neptune), (2) narrow rings like those of Uranus (shepherding, ring shapes, and a self-gravity model of rigid precession), and (3) ring arcs like those seen in stellar-occultation observations of Neptune.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Celestial Mechanics and Dynamical Astronomy (ISSN 0923-2958); 46; 3, 19
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  • 85
    Publication Date: 2011-08-19
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Celestial Mechanics and Dynamical Astronomy (ISSN 0923-2958); 46; 2, 19
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  • 86
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    Publication Date: 2011-08-19
    Description: New radar observations of the moon in 1981-1984 were made using the 430 MHz (70 cm wavelength) radar at the Arecibo observatory, Puerto Rico. The new observations have produced a high resolution lunar radar map with radar cell-sizes near 2-5 km. This new resolution is a three-fold improvement over the previous mapping done in the late 1960's. Since the Arecibo radar antenna beam is only ten arc-minutes (about one-third of the width of the lunar disk), this new map is a mosaic of some eighteen observations. A radarmetric control between the various pieces of the mosaic was obtained via a 'beam-swing', limb-to-limb calibration. When the limb-to-limb calibration was combined with the mosaic, there were significant radar scattering differences across the maria. Eastern Mare Tranquillitatis and western Oceanus Procellarum have weaker echoes than other maria, while the central portion of Mare Serenitatis and northern Mare Imbrium have stronger echoes. There is a radar scattering difference across the southern terra as areas nearer Mare Orientale have stronger echoes than areas further from Mare Orientale.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth, Moon, and Planets (ISSN 0167-9295); 37; 59-70
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  • 87
    Publication Date: 2011-08-19
    Description: The configuration and morphology of the plasma clouds in the ionotail of Venus (revealed by the Pioneer Venus Orbiter) are studied, and the rate of planetary ion escape, which may be associated with the dissipation and removal of the ionospheric plasma, is estimated. The data supplied by the Orbiter's instruments, the Orbiter electron temperature probe, the ion mass spectrometer, the neutral mass spectrometer, the magnetometer, and the plasma analyzer, are analyzed, and the results of the observations are discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 15-26
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  • 88
    Publication Date: 2011-08-19
    Description: Isotopic abundance ratios for mercury were determined by mass spectrometry in six samples of bulk material and in one sample of chondrules from the Allende meteorite. A primary purpose of the work was to attempt to verify the anomalous ratios reported for Hg-196/Hg-202 by neutron activation. Measurements were made on the mercury released at temperatures of 250, 450, 600 C, and in some cases, higher temperatures. The precision of the measurements was such that if an anomaly of the magnitude reported exists, it should have been seen. The isotopic abundance ratios for the other mercury isotopes were also measured. Within the errors of measurement these agreed with normal terrestrial values.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; E124-E12
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  • 89
    Publication Date: 2011-08-19
    Description: A number of extensive linear constructional features occur on the north and east flanks of Alba Patera. They are found in a 150-km-wide zone and comprise aligned ridge elements that are locally associated with short volcanic flows. They are among the youngest volcanic features in the region and are believed to be Martian analogs of terrestrial spatter ridges. On the basis of measurements made on Viking images, it appears that active volcanic fissures on Mars were larger than their terrestrial counterparts.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; E159-E16
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  • 90
    Publication Date: 2011-08-19
    Description: The shock-implantation of gases is studied by artificially shocking whole rock and power samples of terrestrial basalt to pressures of 2-40 GPa. Ar, Kr, Xe, and Ne were implanted into the silicate. It is observed that the amount of implanted gas is linearly proportional to its partial pressure over a pressure range of 0.0001 to 0.1 atmosphere. The fractionation effect in the implanted gas and the gas diffusion properties are examined. The amounts of gas that would have been implanted with 100 percent efficiency are calculated from the measured porosities of the power samples and are compared to observed abundances. It is determined that the implantation efficiencies are approximately 0.5 percent at 2 GPa, 7 percent at 5 GPa, and greater than 50 percent at both 20 and 35 GPa. The experimental data correlate with the shock implantation of Martian gases without mass fractionation into the shock-melted phase of meteorite EETA 79001.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; E99-E114
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  • 91
    Publication Date: 2011-08-19
    Description: Abundances of major and trace elements and magnetic properties of 50 impact melt splashes (IMSs) from the Apollo 16 landing site are analzyed to determine the composition of their meteoritic component. MgO-Sc and Ca-Sc variation diagrams and least-squares mixing models are utilized to analyze the IMS, soil, and rock data. Consideration is given to progenitor lithologies of the IMS, the number of impact events represented by the IMS, and the heterogeneity of impact melts from single events. It is observed that the IMSs are composed of either a mixture of anorthosite and low-Sc impact melt rocks or anorthositic norite. It is determined that the surface Cayley layer is composed of TiO2, MgO, Sc, and La concentrations of 0.69, and 7.1 wt pct and 10.5 and 21.2 microg/g, respectively and 0.38 and 5.9 wt pct and 6.1 and 11.8 microg/g, respectively, for the subsurface Cayley layer. The Descartes Formation composition is estimated as TiO2, MgO, Sc, and La concentrations of 0.25, and 3.5 wt pct and 7.7 and 2.2 microg/g, respectively.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; E21-E42
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  • 92
    Publication Date: 2011-08-19
    Description: Petrographic and major-element analyses are applied to 50 Apollo 16 impact-melt splash (IMS) samples in order to determine their origin and assess the nature of the subregolith source. The macroscopic analyses reveal that the IMSs exhibit a glassy appearance, but the textures range from holohyaline to hyalopilitic. Schlieren-rich glasses dominate the holohyaline areas, and the crystalline areas are mainly spherulitic. It is observed that most IMSs contain feldspathic monomineralic and lithic clasts and no regolithic materials. It is detected that the chemistry of most IMSs is not like the local regolith and appears to represent varied mixtures of VHA impact-melt breccias and anorthosite; the host rocks are mainly dimict breccias. It is concluded that the Cayley Formation is a polymict deposit composed of VHA impact-melt breccias and anorthosites. Tables revealing the macroscopic characteristics of the IMSs and the major-element composition of IMSs and various host rock are presented.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; E3-E20
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  • 93
    Publication Date: 2011-08-19
    Description: Twenty-one lunar craters have radar bright ring appearances which are analogous to eleven complete ring features in the earth-based 12.5 cm observations of Venus. Radar ring diameters and widths for the lunar and Venusian features overlap for sizes from 45 to 100 km. Radar bright areas for the lunar craters are associated with the slopes of the inner and outer rim walls, while level crater floors and level ejecta fields beyond the raised portion of the rim have average radar backscatter. It is proposed that the radar bright areas of the Venusian rings are also associated with the slopes on the rims of craters. The lunar craters have evolved to radar bright rings via mass wasting of crater rim walls and via post-impact flooding of crater floors. Aeolian deposits of fine-grained material on Venusian crater floors may produce radar scattering effects similar to lunar crater floor flooding. These Venusian aeolian deposits may preferentially cover blocky crater floors producing a radar bright ring appearance. It is proposed that the Venusian features with complete bright ring appearances and sizes less than 100 km are impact craters. They have the same sizes as lunar craters and could have evolved to radar bright rings via analogous surface processes.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth, Moon, and Planets (ISSN 0167-9295); 36; 167-185
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  • 94
    facet.materialart.
    Unknown
    In:  Other Sources
    Publication Date: 2011-08-19
    Description: The production of clay mineraloids (CMs) in the weathering of stony meteorites recovered in the Allan Hills and Elephant Moraine areas of Antarctica is investigated, applying electron microbeam analysis, pyrolysis/mass spectroscopy, X-ray diffractometry, and differential scanning calorimetry to whole-rock chips from two eucrites, two diogenites, and an H5 chondrite. The data are presented in tables, graphs, and photomicrographs and characterized in detail. Massive to incipient-vermicular CM formations with smectitelike or micalike compositions and indications of poor crystallization are observed and attributed to hydrocryogenic diagenesis (with little or no liquid water) on time scales of 10-1000 kyr. The need to take the compositional effects of weathering into account before attempting to reconstruct the preterrestrial histories of meteorites is stressed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 50; 2215-222
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  • 95
    facet.materialart.
    Unknown
    In:  Other Sources
    Publication Date: 2011-08-19
    Description: In situ nightside electric field observations from the Pioneer Venus Orbiter have been interpreted as evidence of extensive lightning in the lower atmosphere of Venus. The scenario, including proposed evidence of clustering of lightning over surface highland regions, has encouraged the acceptance of currently active volcanic output as part of several investigations of the dynamics and chemistry of the atmosphere and the geology of the planet. However, the correlation between the 100-hertz electric field events attributed to lightning and nightside ionization troughs resulting from the interaction of the solar wind with the ionosphere indicates that the noise results from locally generated plasma instabilities and not from any behavior of the lower atmosphere. Furthemore, analysis of the spatial distribution of the noise shows that it is not clustered over highland topography, but rather occurs at random throughout the latitude and longitude regions sampled by the orbiter during the first 5 years of operation, from 1978 to 1984. Thus the electric field observations do not identify lightning and do not provide a basis for inferring the presence of currently active volcanic output. In the absence of known evidence to the contrary, it appears that Venus is no longer active.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 234; 1087-109
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  • 96
    facet.materialart.
    Unknown
    In:  Other Sources
    Publication Date: 2011-08-19
    Description: Satellites smaller than Mimas (r = 195 km) are distinguished by irregular overall shapes and by rough limb topography. Material properties and impact cratering dominate the shaping of these objects. Long fragmentation histories can produce a variety of internal structures, but so far there is no direct evidence that any small satellite is an equilibrium ellipsoid made up of noncohesive gravitationally bound rubble. One many bodies that orbit close to their primary the tidal and rotational components of surface gravity strongly affect the directions of local g and thereby affect the redistribution of regolith by mass wasting. Downslope movement of regolith is extensive on Deimos, and is probably effective on many other small satellites. It is shown that in some cases observed patterns of downslope mass wasting cold produce useful constraints on the satellite's mean density. The diversity of features seen in the few high-resolution images of small satellites currently available suggests that these objects have undergone complex histories of cratering, fragmentation, and regolith evolution.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 97
    Publication Date: 2011-08-19
    Description: The orbital properties, surface compositions, opposition surges, masses, radii, and densities of the satellites of Uranus are presented. It is noted that the Uranian satellites are comparable in size to the largest of Saturn's icy satellites while density measurements suggest that the bulk compositions of Ariel and Umbriel might be different from those of Titania and Oberon. Consideration is given to the two satellites of Neptune and the question of a third satellite is addressed. The elements of Charon, determined from astrometric observations by photographic and speckle interferometric techniques, and then from eclipse observations, are given. The diurnal period of Pluto and its photometric lightcurve are discussed. The similarities and differences existing between the satellites of Uranus and Neptune and the Pluto-Charon pair are mentioned briefly.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 98
    Publication Date: 2011-08-19
    Description: When natural satellites and ring particles are embedded within magnetospheric plasmas, the charged particles interact with the surfaces of these solid bodies. These interactions have important implications for the surface, the atmosphere of the parent body, and the magnetosphere as a whole. Significant erosion of the surface by sputtering, as well as redeposition of sputter ejecta, can occur over geologic time. The surface can also be chemically modified. Sputter ejecta can make important contributions to the atmosphere; sputtering provides a lower limit to the atmospheric column density even for arbitrarily cold satellite surfaces. Sputter ejecta escaping from the parent body can form extensive neutral clouds within the magnetosphere. Ionization and dissociation within these neutral clouds can be dominant sources of low-energy plasma. The importance of these processes is discussed for the satellites and magnetospheres of Jupiter, Saturn and Uranus.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 99
    facet.materialart.
    Unknown
    In:  Other Sources
    Publication Date: 2011-08-19
    Description: Four tables of planetary and satellite data are presented which list satellite discoveries, planetary parameters, satellite orbits, and satellite physical properties respectively. A scheme for classifying the satellites is provided and it is noted that most known moons fall into three general classes: regular satellites, collisional shards, and irregular satellites. Satellite processes are outlined with attention given to origins, dynamical and thermal evolution, surface processes, and composition and cratering. Background material is provided for each family of satellites.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 100
    Publication Date: 2011-08-19
    Description: Thermal evolution models of satellites are discussed with emphasis placed on the fundamental physical processes common to all planetary bodies. A comparison is made between the different evolutionary tracks followed by individual satellites. Consideration is given to the compositions and structures of satellites, heat sources, relevant thermal and mechanical properties of the materials in satellite interiors, and heat transfer mechanisms. Thermal history scenarios are presented for the majority of the satellites of the solar system and these are related to the constraints imposed by surface geology.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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