196,735 research outputs found
High-pressure behaviour of serpentine and elasticity systematics of hydrous and nominally anhydrous phases
No full textViscosity Measurements at High Pressures: A Critical Appraisal of Corrections to Stokes' Law
No full text<p>Included are central data and codes for the manuscript "Viscosity Measurements at High Pressures: A Critical Appraisal of Corrections to Stokes' Law", published May 2, 2024.</p>
<p>Reference for full article:</p>
<p>Ashley, A.W., Mookherjee, M., Xu, M., Yu, T., Manthilake, G., & Wang, Y. (2024). Viscosity measurements at high pressures: A critical appraisal of corrections to Stokes' Law. Journal of Geophysical Research: Solid Earth, 129, e2023JB028489. https://doi.org/10.1029/2023JB028489</p>
Dehydration of chlorite explains anomalously high electrical conductivity in the mantle wedges
No full textMantle wedge regions in subduction zone settings show anomalously high electrical conductivity (∼1 S/m) that has often been attributed to the presence of aqueous fluids released by slab dehydration. Laboratory-based measurements of the electrical conductivity of hydrous phases and aqueous fluids are significantly lower and cannot readily explain the geophysically observed anomalously high electrical conductivity. The released aqueous fluid also rehydrates the mantle wedge and stabilizes a suite of hydrous phases, including serpentine and chlorite. In this present study, we have measured the electrical conductivity of a natural chlorite at pressures and temperatures relevant for the subduction zone setting. In our experiment, we observe two distinct conductivity enhancements when chlorite is heated to temperatures beyond its thermodynamic stability field. The initial increase in electrical conductivity to ∼3 × 10-3 S/m can be attributed to chlorite dehydration and the release of aqueous fluids. This is followed by a unique, subsequent enhancement of electrical conductivity of up to 7 × 10-1 S/m. This is related to the growth of an interconnected network of a highly conductive and chemically impure magnetite mineral phase. Thus, the dehydration of chlorite and associated processes are likely to be crucial in explaining the anomalously high electrical conductivity observed in mantle wedges. Chlorite dehydration in the mantle wedge provides an additional source of aqueous fluid above the slab and could also be responsible for the fixed depth (120 ± 40 km) of melting at the top of the subducting slab beneath the subduction-related volcanic arc front
Solubility of water in pyrope-rich garnet at high pressures and temperature
Get PDF[1] The water solubility in pyrope-rich garnet was determined between pressures of 5-9 GPa and temperatures of 1373 -1473 K under silica activity and oxygen fugacity similar to those expected in the Earth's upper mantle. We found that pyrope-rich garnet has substantial water solubility up to $0.1 wt% under these conditions. In addition, the water content in garnet varied as a function of chemical conditions. In particular, the variation in water fugacity (and Mg#) caused a variation in water partitioning with olivine (D H 2 O ol/py ). The substantial water solubility in pyrope-rich garnet under deep upper mantle conditions might have significant influence on physical and transport properties. Citation: Mookherjee, M., and S. Karato (2010), Solubility of water in pyrope-rich garnet at high pressures and temperature, Geophys. Res. Lett., 37, L03310
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Forest Degradation in the Himalayas: Determinants and Policy Options
Get PDFThis paper summarizes findings from a decade-long project on forest degradation in the mid-Himalayan region of India and Nepal. The analysis is based on LSMS data for Nepal and field work in Indian states of Uttaranchal and Himachal Pradesh comprising sample surveys of forests, households and village communities, besides commissioned anthropological studies for select villages. The purpose was to ascertain the nature and magnitude of deforestation and degradation from ground-level forest measurements, its implications for living standards of local communities, the contribution of different factors commonly alleged such as local poverty, inequality, economic growth, demographic changes, property rights and lack of collective action by local communities. Principal findings, policy implications and questions for future research are discussed.
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Diversity and Equality: 'Toleration as Recognition' Reconsidered
No full textWhile toleration is widely considered a fundamental principle in liberal societies, for critics of traditional conceptions of this principle such as Anna Elisabetta Galeotti, the idea of toleration as non-interference is increasingly unsuited to respond to the type of pluralism characteristic of these societies. For Galeotti, the most important cases of toleration in contemporary liberal societies arise not due to the plurality of individual values and beliefs, but stem from the coexistence of diverse groups and cultures with unequal standing. When socially despised groups seek to exhibit their differences in the public sphere in an attempt to secure equal social standing and respect, Galeotti proposes a positive form of ‘toleration as recognition’. This paper argues that while Galeotti’s analysis offers a powerful critique of conceptions of pluralism that seek to confine difference and diversity to the non-political private sphere, her notion of ‘toleration as recognition’ ultimately fails to provide an adequate response to the complex issues of power and identity central to her critique of traditional conceptions of toleration. For, not only does her conception of ‘toleration as recognition’ remain ambiguous, but Galeotti pays insufficient attention to the social and political processes that shape the very identities that are to be recognised
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