+ Visit NASA.gov + Contact NASA   + Home Select Search Field * All Report - Patent Number Abstract *Accession Number *NASA Center *Author NameDocument IDKeywordsPublication Date *Title * Find Results With All of the words At least one of the words Enter Search Term  within returned results    Search Tips: Use only the fields with * to search NIX collection. Enclose terms in double quotation marks (") to search for exact phrases, ie: "space shuttle". NOTE: Commas and dashes are removed from search term by search engine. Select Reset Search button to start a new search. See Help for more tips. + NASA Center + Publication Year + Subject + Availability Options – Item/Media Type  + Journal Article  + NASA Report  + Technical Report  + Conference Paper Selected Navigations: Author > Walker, J. C. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 13 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order 1 2 Next  Numerical residual perturbation solutions applied to the problem of a close satellite of the smaller body in the restricted three-body problem Author(s): Eckstein, M. C.; Holman, H. A.; Walker, J. C. Abstract: Numerical residual perturbation solution for prediction of satellite position in restricted three-body problem NASA Center: NASA (non Center Specific) Publication Year: 1965 Added to NTRS: 2006-11-06 Accession Number: 66N12184; Document ID: 19660002895; Report Number: NASA-CR-68122, SM-49213 Something is wrong with climate theory Author(s): Walker, J. C.; Sloan, L. C. Abstract: We frequently forget that there is more to science than the making of a more precise measurement or a more elaborate calculation. It is even more than applying to new problems the methods that worked on old problems. These ... NASA Center: NASA (non Center Specific) Publication Year: 1992 Added to NTRS: 2006-08-02 Document ID: 20040090021 Global geochemical cycles of carbon, sulfur and oxygen Author(s): Walker, J. C. Abstract: Time resolved data on the carbon isotopic composition of carbonate minerals and the sulfur isotopic composition or sulfate minerals show a strong negative correlation during the Cretaceous. Carbonate minerals are ... NASA Center: NASA (non Center Specific) Publication Year: 1986 Added to NTRS: 2006-08-02 Document ID: 20040088881 Iron and sulfur in the pre-biologic ocean Author(s): Walker, J. C.; Brimblecombe, P. Abstract: Tentative geochemical cycles for the pre-biologic Earth are developed by comparing the relative fluxes of oxygen, dissolved iron, and sulfide to the atmosphere and ocean. The flux of iron is found to exceed both the oxygen ... NASA Center: NASA (non Center Specific) Publication Year: 1985 Added to NTRS: 2006-08-02 Document ID: 20040121543 Climatic forcing of carbon-oxygen isotopic covariance in temperate-region marl lakes Author(s): Drummond, C. N.; Patterson, W. P.; Walker, J. C. Abstract: Carbon and oxygen stable isotopic compositions of lacustrine carbonate from a southeastern Michigan marl lake display linear covariance over a range of 4.0 Peedee belemnite (PDB) in oxygen and 3.9 (PDB) in carbon. ... NASA Center: NASA (non Center Specific) Publication Year: 1995 Added to NTRS: 2006-08-02 Document ID: 20040089801 How life affects the atmosphere Author(s): Walker, J. C. Abstract: The impact of life on the atmosphere is examined through a discussion of the budgets of important atmospheric constituents and the processes that control their concentrations. Life profoundly influences oxygen and a number ... NASA Center: NASA (non Center Specific) Publication Year: 1984 Added to NTRS: 2006-08-02 Document ID: 20040120359 Possible role of oceanic heat transport in early Eocene climate Author(s): Sloan, L. C.; Walker, J. C.; Moore, T. C. Jr Abstract: Increased oceanic heat transport has often been cited as a means of maintaining warm high-latitude surface temperatures in many intervals of the geologic past, including the early Eocene. Although the excess amount of ... NASA Center: NASA (non Center Specific) Publication Year: 1995 Added to NTRS: 2006-08-02 Document ID: 20040090095 Influence of variable rates of neritic carbonate deposition on atmospheric carbon dioxide and pelagic sediments Author(s): Walker, J. C.; Opdyke, B. C. Abstract: Short-term imbalances in the global cycle of shallow water calcium carbonate deposition and dissolution may be responsible for much of the observed Pleistocene change in atmospheric carbon dioxide content. However, any ... NASA Center: NASA (non Center Specific) Publication Year: 1995 Added to NTRS: 2006-08-02 Document ID: 20040089460 Modelling the Phanerozoic carbon cycle and climate: constraints from the 87Sr/86Sr isotopic ratio of seawater Author(s): Francois, L. M.; Walker, J. C. Abstract: A numerical model describing the coupled evolution of the biogeochemical cycles of carbon, sulfur, calcium, magnesium, phosphorus, and strontium has been developed to describe the long-term changes of atmospheric carbon ... NASA Center: NASA (non Center Specific) Publication Year: 1992 Added to NTRS: 2006-08-02 Document ID: 20040090304 Abrupt climate change and transient climates during the Paleogene: a marine perspective Author(s): Zachos, J. C.; Lohmann, K. C.; Walker, J. C.; Wise, S. W. Abstract: Detailed investigations of high latitude sequences recently collected by the Ocean Drilling Program (ODP) indicate that periods of rapid climate change often culminated in brief transient climates, with more extreme ... NASA Center: NASA (non Center Specific) Publication Year: 1993 Added to NTRS: 2006-08-02 Document ID: 20040090320 1 2 Next  + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007