17,332 research outputs found
Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology
No full textRecently, the veracity of the published chronology for the Pliocene section of North Atlantic Ocean Drilling Program Site 982 was called into question. Here, we examine the robustness of the original age model as well as the proposed age model revision. The proposed revision is predicated on an apparent mis-identification of the depth to the Gauss-Matuyama (G/M) polarity chronozone reversal boundary (2.581 Ma) based on preliminary shipboard paleomagnetic data and offers a new chronology which includes a hiatus between ~3.2 and 3 Ma. However, an even more accurate shore-based, u-channel-derived polarity chronozone stratigraphy for the past ~2.7 Ma supports the shipboard composite stratigraphy and demonstrates that the original estimate of the depth of the G/M reversal in the Site 982 record is correct. Thus, the main justification forwarded to support the revised chronology no longer exists. We demonstrate that the proposed revision results in a pronounced anomaly in sedimentation rates proximal to the proposed hiatus, erroneous assignment of marine-isotope stages in the Site 982 Pliocene benthic stable oxygen isotope stratigraphy, and a markedly worse correlation of proxy records between this site and other regional paleoclimate data. We conclude that the original chronology for Site 982 is a far more accurate age-model than that which arises from the published revision. We strongly recommend the use of the original chronology for all future work at Site 982
(Table 1) Age model and sedimentation rates of ODP Site 162-983 sediments
No full textSediment depth is given in mcd. All depth-age pairs are based on planktonic foraminiferal d18O stratigraphic picks from J. McManus (unpubl. data) and Channell et al. (1998, doi:10.1038/28833), with the exception of the depth and age of the Brunhes/Matuyama boundary (780 ka), Jaramillo top (990 ka), Jaramillo bottom (1070 ka), and last occurrence of Gephyrocapsa spp. A/B (N) (1230 ka), which are used as reported in Jansen, Raymo, Blum, et al. (1996, doi:10.2973/odp.proc.ir.162.1996)
The Story of "Me" Contemporary American Autofiction
No full textCover -- Title Page -- Copyright Page -- Contents -- Acknowledgments -- Introduction -- 1. Masculinity, Whiteness, and Postmodern Self-Consciousness -- 2. Rage against the Dying of the Author -- 3. The New Journalism as the New Fiction -- 4. Trauma Autofiction, Dissociation, and the Authenticity of "Real" Experience -- 5. Memoir vs. Autofiction as the Story of Me vs. the Story of "Me" -- Coda -- Appendix -- Notes -- References -- IndexDescription based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
Planktic foraminifera shell chemistry response to seawater chemistry: Pliocene-Pleistocene seawater Mg/Ca, temperature and sea level change
Get PDFForaminifera Mg/Ca paleothermometry forms the basis of a substantial portion of ocean temperature reconstruction over the last 5 Ma. Furthermore, coupled Mg/Ca–oxygen isotope (δ18O) measurements of benthic foraminifera can constrain eustatic sea level (ESL) independent of paleo-shoreline derived approaches. However, this technique suffers from uncertainty regarding the secular variation of the Mg/Ca seawater ratio (Mg/Casw) on timescales of millions of years. Here we present coupled seawater–test Mg/Ca–temperature laboratory calibrations of Globigerinoides ruber in order to test the widely held
assumptions that (1) seawater–test Mg/Ca co-vary linearly, and (2) the Mg/Ca–temperature sensitivity remains constant with changing Mg/Casw. We find a nonlinear Mg/Catest–Mg/Casw relationship and a lowering of the Mg/Ca–temperature sensitivity at lower than modern Mg/Casw from 9.0% ◦C−1 at Mg/Casw = 5.2 mol mol−1 to 7.5 ± 0.9%◦C−1 at 3.4 mol mol−1. Using our calibrations to more accurately calculate the offset between Mg/Ca and biomarker-derived paleotemperatures for four sites, we derive a Pliocene
Mg/Casw ratio of ∼4.3 mol mol−1. This Mg/Casw implies Pliocene ocean temperature 0.9–1.9 ◦C higher than previously reported and, by extension, ESL ∼30 m lower compared to when one assumes that Pliocene Mg/Casw is the same as at present. Correcting existing benthic foraminifera datasets for Mg/Casw indicates that deep water source composition must have changed through time, therefore seawater oxygen isotope reconstructions relative to present day cannot be used to directly reconstruct Pliocene ESL
Remember Me A Novella about Finding Our Way to the Cross
No full textShades of Light.Cover -- Title Page -- Copyright -- Dedication Page -- Contents -- 1 The Word Became Flesh -- 2 The Gift of Myrrh -- 3 Taking the Cup -- 4 With a Kiss -- 5 Awakened -- 6 Accused -- 7 Bearing the Cross -- 8 Lament -- 9 Stripped -- 10 Pierced -- 11 It Is Finished -- 12 Into Your Hands -- 13 Buried -- 14 Risen -- Epilogue -- Journey to the Cross -- Acknowledgments -- Also Available -- Praise for Remember Me -- About the Author -- More Titles from InterVarsity PressShades of Light.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
PHOTOINDUCED PROTON TRANSFER IN MACROMOLECULAR SYSTEMS
No full textPhotochromic materials are well known candidates for several technological applications such as devices for the optical storage of informations, optical switches and in general as materials exhibiting photoresponsive properties when irradiated with light of suitable frequency and intensity. In particular in the last few years a great interest grew up on using these compounds as building blocks for the construction of molecular logic gates able to perform simple logic operations (AND, NOT and OR). These molecular switches are based on the interplay between chemical, electrical or optical stimulations and absorbance, luminescence or redox outputs
In this regard, spiropyran (SP), a three state molecular switch, has been widely studied and resulted promising for obtaining a device able to elaborate information by detecting inputs of one form and transducing them into outputs of another one1. As previously reported [6-8], irradiation of this colourless compound with UV light induces heterolytic cleavage of the spiro carbon-oxygen bond, thus producing the ring opened and intensively coloured merocyanine form (ME). This process is thermically and photochemically reversible. Furthermore the addition of acid induces the formation of the protonated merocyanine MEH which, if irradiated with Visible light, releases a proton and comes back to SP. The absorption and emission properties of these three states (SP, ME and MEH) are significantly different and allow to use these compounds for repeated data recording and optical data storage
"Test me and treat me" - attitudes to vitamin D deficiency and supplementation: a qualitative study
Get PDF© 2015 BMJ Open, "Test me and treat me"-attitudes to vitamin D deficiency and supplementation: a qualitative study. This manuscript version is made available under the Creative Commons Attribution Licens
Book of the month: Kennetta Hammond Perry's London is the Place for Me
No full textAuthor: Desmond L. Kemp Indiana University Purdue University Our book recommendation of the month is London is the Place for me whereby activism in London and America has been an ongoing challenge for Black people. Perry delivers a solid account of how post-war Afro-Caribbean migrants resisted British racism to establish their citizenship in England. The introduction begins with a calypso music tribute in "Windrush Politics", sets the tone of social history for migrants with a tale of the arr..
Remind Me to Investigate
Get PDFPolitical cartoon depicting United States Senator James O. Eastland of Mississippi dictating to his secretary, Remind Me to Investigate the Ole Miss Affair, My Findings Will Be as Follows; Source: unknown; Unknown datehttps://egrove.olemiss.edu/jws_clip/1054/thumbnail.jp
Dynamics of Network Formation Processes in the Co-Author Model
Get PDFThis article studies the dynamics in the formation processes of a mutual consent network in game theory setting: the Co-Author Model. In this article, a limited observation is applied and analytical results are derived. Then, 2 parameters are varied: the number of individuals in the network and the initial probability of the links in the network in its initial state. A simulation result shows a finding that is consistent with an analytical result for a state of equilibrium while it also shows different possible equilibria.Dynamics, Network, Game Theory, Model,Simulation, Equilibrium, Complexity
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