7,197 research outputs found
Characterising low temperature alteration and oxidation of the upper oceanic crust
No full textThe circulation of low temperature hydrothermal fluids through the oceanic crust has significant effects on the geochemical composition of the oceans and crust. Quantification of the magnitude and extent of these changes is essential for determining the crustal inputs to the mantle at subduction zones, the sub-sea floor microbial biomass, and the net changes in basement and seawater geochemistry. A highly heterogeneous upper crustal permeability structure, and variabilities in sediment thickness, lithology type, and spreading rate, means that fluid pathways and the extent of alteration are difficult to constrain.The effects of low temperature hydrothermal alteration in basement rocks are quantified at two hydrological end-member locations: a 0.97 - 3.59 Myr basement transect across the Juan de Fuca (JdF) Ridge Flank in the East Pacific Ocean, and at 8 Myr basement Hole 395A, located at 23N on the western flank of the Mid-Atlantic Ridge. The influences of regional hydrology are demonstrated in observed variabilities in the character of alteration. Generally, the JdF basement rocks are characterised by orange, green, and grey alteration halos, and net geochemical changes associated with alteration occurring under oxidising conditions. Hole 395A basalts are orange and grey, and net geochemical changes reflect a change from open to partially restricted circulation at 400 mbsf. At both sites, whole rock 87Sr/86Sr, Fe3+/FeTOT, and secondary mineral abundances show no trends of increasing alteration intensity with depth. The magnitude of alteration is similar in JdF and North Pond Holes (~10 %), implying that the oceanic crust is altered up to average values early; within the first million years of formation.A global study of the oxidation extent of the oceanic crust supports these findings. The average Fe3+/FeTOT ratio for 3000 new and compiled analyses are weighted according to alteration type, and show that the oxidation extent is raised to an average of 34 % within the first 1 Myr of crustal formation, and does not increase as a function of crustal age. Additionally, results show that flow type has only minor influence on the oxidation extent of basalts. Downhole plots of Fe3+/FeTOT show that a sharp transition to lower oxidation ratios with depth is only evident in Hole 504B. New data from Hole 1256D show that elevated oxidation ratios are maintained to as deep as 1500 mbsf. A new estimate for the total oxidation extent of young and old ocean crust is 21 plus or minus 4 % to 23 plus or minus 4 %, respectively. An age representative calculation of the total net flux of ferric iron transported to the mantle at modern subduction zones is 1.20 x 1013 molFe3+/yr
Jennifer-Angoh/Pine-Marten-Rodent: v.1.0.0
No full text<p>Code for article "How do microtine rodent abundance, snow and landscape parameters influence pine marten Martes martes population dynamics?". Authors: Siow Yan Jennifer Angoh Affiliation: Inland Norway University of Applied Sciences, NO-2480, Koppang, Norway. Corresponding author: Siow Yan Jennifer Angoh, [email protected], ORCID: <a href="https://orcid.org/0000-0002-3791-0150">https://orcid.org/0000-0002-3791-0150</a></p>
<p><strong>Full Changelog</strong>: <a href="https://github.com/Jennifer-Angoh/Pine-Marten-Rodent/commits/Pine-Marten-Rodent">https://github.com/Jennifer-Angoh/Pine-Marten-Rodent/commits/Pine-Marten-Rodent</a></p>
Jennifer-Angoh/Pine-Marten-Rodent: v.1.0.1
No full text<p>Code for article "How do microtine rodent abundance, snow and landscape parameters influence pine marten Martes martes population dynamics?". Authors: Siow Yan Jennifer Angoh Affiliation: Inland Norway University of Applied Sciences, NO-2480, Koppang, Norway. Corresponding author: Siow Yan Jennifer Angoh, [email protected], ORCID: <a href="https://orcid.org/0000-0002-3791-0150">https://orcid.org/0000-0002-3791-0150</a></p>
<p><strong>Full Changelog</strong>: <a href="https://github.com/Jennifer-Angoh/Pine-Marten-Rodent/commits/Pine-Marten-Rodent">https://github.com/Jennifer-Angoh/Pine-Marten-Rodent/commits/Pine-Marten-Rodent</a></p>
Dr. Jennifer Bowie – Faculty Author Interview
No full textDr. Jennifer Bowie, Assistant Professor of Political Science, is the co-author of a new book, The View from the Bench and Chambers: Examining Judicial Process and Decision Making on the U.S. Courts of Appeals, published recently by the University of Virginia Press. This book presents a series of quantitative analyses of judicial decisions in the Courts of Appeals with the perspectives gained from in-depth interviews with the judges and their law clerks
Ep. #136 - Jennifer Gabrys
No full textThis recording and transcript form part of a collection of podcasts conducted by the Cultures of Energy at Rice University. Cultures of Energy brings writers, artists and scholars together to talk, think and feel their way into the Anthropocene. We cover serious issues like climate change, species extinction and energy transition. But we also try to confront seemingly huge and insurmountable problems with insight, creativity and laughter.Your cohosts discuss what sensory technologies they might wish for their own home and the kind of multispecies encounters Cymene might have had in a Tegucigalpa red light district hotel (trigger warning: there be cockroach stories ahead!) Then (20:29) we chat with the multitalented Jennifer Gabrys from Goldsmiths (https://www.jennifergabrys.net), author most recently of Program Earth (U Minnesota Press, 2016), and her fascinating work on the spread of environmental sensing technologies and the impacts they are having on our worlds. Jennifer explains to us why she became taken with Whitehead’s concept of the “superject” as a different, more distributed and relational way of thinking about sensation and experience. That gets us to talking about nonhuman modes of sensing, what humans want from all these sensors, the problem of environmentality in smart city designs, computational urbanism, and why the figure of the idiot interests her in terms of thinking about models of digital participation. Jennifer explains how we can be for a world (and for other worlds) rather than simply of the world and why the etho-ecological is thus such an interesting domain for her. In closing, we return to Jennifer’s pathbreaking work on digital waste and the need for electronic environmentalism and talk about the e-waste/energy nexus and the paradox of spending ever more energy to monitoring ourselves using more energy. Listen on
Author and poet Lily Brett at the National Library of Australia, Canberra, 18 October 2012 /
No full textTitle from acquisitions documentation.; Part of the collection: Portraits of author and poet Lily Brett at the National Library of Australia, Canberra, 18 October 2012.; Acquired in digital format; access copy available online.; Mode of access: Online.; Photographed by a staff member of the National Library of Australia
Adrian Caesar speaking at Alex Miller author: A Celebration, held at the National Library, Canberra, 30 October 2011 /
No full textTitle from information supplied by photographer.; Part of the collection: Alex Miller author: A Celebration, held at the National Library of Australia theatre, 30 October 2011.; Mode of access: Online.; Photographed by a staff member of the National Library of Australia
Dr. Jennifer Erkulwater and Dr. Catherine Bagwell – Faculty Author Interview
No full textFeatured authors are Dr. Catherine Bagwell, Associate Professor of Psychology and Dr. Jennifer Erkulwater, Associate Professor of Political Science. Dr. Rick Mayes is another co-author, but he is unable to join us today due to a research leave project in Peru. Their new book, Medicating Children: ADHD and Pediatric Mental Health, integrates analyses of the clinical, political, historical, educational, social, economic and legal aspects of ADHD and the medications and treatment surrounding the mental disorder
224 - Jennifer Marie Owen
No full textThis poster was presented by Jennifer Owen at the 2017 Graduate Student Showcase.Includes bibliographical references.Video games play an integral role in the lives of adolescents and provide unique opportunities for active and engaged learning. This project contains an exploratory analysis of the narrative constructs within video games and investigates how they can be utilized as an educational tool in secondary English classrooms. As an alternative text, video games offer unique potential to study storytelling and elements of literature, while also providing new insights into digital compositions. Through analysis and evaluation, the development of an innovative curriculum is constructed in the hopes to persuade educators to seek more enriching learning opportunities for their students
David Hill speaking at the National Library of Australia, Canberra, 23 October 2012, 1 /
No full textTitle devised by cataloguer from information supplied by photographer.; Part of the collection: Author talk with David Hill at the National Library of Australia, Canberra, 23 October 2012; Acquired in digital format; access copy available online.; Mode of access: Online.; Photographed by a staff member of the National Library of Australia
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