12 Works

Intergranular Pore Structures in Sandstones

Chul Moon & Matthew Andrew
Dataset: Sandstones (Bentheimer, Doddington, and Rotleigend) X-Ray Microscopy (XRM) is used to examine the intergranular pore structures in a series of sandstones. All three sandstone samples are imaged using a ZEISS Versa X-ray Microscope (XRM) (ZEISS X-Ray Microscopy, Pleasanton, CA). 3D volumes of the varying resolution are reconstructed from a series of 1600 projections, sequentially acquired at evenly spaced angular increments during a 360° rotation. Each projection consists of 1024 x 1024 pixels and is...

Southern Menthodist University

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Temporary deployment of infrasound sensors in Oklahoma

Black Thunder Mine

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Portable infrasound and seismic array deployed 200 km from the Black Thunder coal mine recorded signals. Seven, single‐fired explosions were detonated in the Black Thunder coal mine, six closely spaced (<100 m) and the seventh located ∼3 km away. The amount of explosive ranged from 2500 to 22,100 kg. The signal to noise ratios (SNR) at regional distance ranged from near the noise level to 2 orders of magnitude above the noise (<1–100 SNR).

Universally Espoused Fraternal Values on College and University Campuses: Commonplace or Coincidence?

Ashley Tull & Andrew Shaw

A Framework for Evaluating Stopping Rules for Fixed-Form Formative Assessments: Balancing Efficiency and Reliability

Deni L Basaraba, Paul Yovanoff, Pooja Shivraj & Leanne R. Ketterlin-Geller
Stopping rules for fixed-form tests with graduated item difficulty are intended to stop administration of a test at the point where students are sufficiently unlikely to provide a correct response following a pattern of incorrect responses. Although widely employed in fixed-form tests in education, little research has been done to empirically evaluate the stopping rules in these tests that often have important instructional and/or placement implications for students. In this manuscript, we propose and research...

Data from: A new durophagous stem cheloniid turtle from the lower Paleocene of Cabinda, Angola

Timothy S. Myers, Michael J. Polcyn, Octávio Mateus, Diana P. Vineyard, António O. Gonçalves & Louis L. Jacobs
A new stem cheloniid turtle, Cabindachelys landanensis, gen. et sp. nov., is represented by a nearly complete skull and partial hyoid collected in lower Paleocene shallow marine deposits, equivalent to the offshore Landana Formation, near the town of Landana in Cabinda, Angola. A partial chelonioid carapace previously reported from this locality is referred here to C. landanensis. Cabindachelys landanensis possesses clear synapomorphies of Pan-Cheloniidae, including a rod-like rostrum basisphenoidale, V-shaped basisphenoid crest, and secondary palate,...

Data from: Human-mediated extirpation of the unique Chatham Islands sea lion and implications for the conservation management of remaining New Zealand sea lion populations

Nicolas J. Rawlence, Catherine J. Collins, Christian N. K. Anderson, Justin J. Maxwell, Ian W. G. Smith, Bruce C. Robertson, Michael Knapp, Katherine Ann Horsburgh, Jo-Ann L. Stanton, R. Paul Scofield, Alan J. D. Tennyson, Elizabeth A. Matisoo-Smith & Jonathan M. Waters
While terrestrial megafaunal extinctions have been well characterized worldwide, our understanding of declines in marine megafauna remains limited. Here, we use ancient DNA analyses of prehistoric (<1450–1650 AD) sea lion specimens from New Zealand's isolated Chatham Islands to assess the demographic impacts of human settlement. These data suggest there was a large population of sea lions, unique to the Chatham Islands, at the time of Polynesian settlement. This distinct mitochondrial lineage became rapidly extinct within...

Bentheimer networks

Chul Moon & Matthew Andrew
Dataset: Bentheimer networks Bentheimer is imaged by a ZEISS Versa X-ray Microscope (XRM) (ZEISS X-Ray Microscopy, Pleasanton, CA). A series of 1600 2D projections are acquired at regular angular increments over a 360° rotation. These reconstruct a series of 3D volumes: cylinders which are then cropped to the maximally inscribed cubes. 2D projections are 1024 x 1024 pixels, and 3D volumes are 1024 x 1024 x1024 voxels. Images are segmented by ZEISS Zen Intellesis machine...

Data from: Best practices for justifying fossil calibrations

James F. Parham, Philip C. J. Donoghue, Christopher J. Bell, Tyler D. Calway, Jason J. Head, Patricia A. Holroyd, Jun G. Inoue, Randall B. Irmis, Walter G. Joyce, Daniel T. Ksepka, José S. L. Patané, Nathan D. Smith, James E. Tarver, Marcel Van Tuinen, Ziheng Yang, Kenneth D. Angielczyk, Jenny M. Greenwood, Christy A. Hipsley, Jacobs Louis, Peter J. Makovicky, Johannes Müller, Krister T. Smith, Jessica M. Theodor, Rachel C. M. Warnock, Michael J. Benton … & Louis Jacobs
Our ability to correlate biological evolution with climate change, geological evolution, and other historical patterns is essential to understanding the processes that shape biodiversity. Combining data from the fossil record with molecular phylogenetics represents an exciting synthetic approach to this challenge. The first molecular divergence dating analysis (Zuckerkandl and Pauling 1962) was based on a measure of the amino acid differences in the hemoglobin molecule; with replacement rates established (calibrated) using inaccurate paleontological age estimates...

Data from: Large mammal declines and the incipient loss of mammal-bird mutualisms in an African savanna ecosystem

Nathan Diplock, Kate Johnston, Antoine Mellon, Laura Mitchell, Madison Moore, Daniel Schneider, Alyssa Taylor, Jess Whitney, Kera Zegar, John Kioko & Christian Kiffner
Over the past half-century, large mammal populations have declined substantially throughout East Africa, mainly due to habitat loss and unsustainable direct exploitation. While it has been acknowledged that the loss of large mammals can have direct and cascading effects on community composition and ecosystem characteristics, limited quantitative work has been done on how declines of large herbivore populations impacts the abundance of mutualistic symbionts. Using a space-for-time observational approach, we quantified the large mammal community...

Data from: Estimating soil pCO2 using paleosol carbonates: implications for the relationship between primary productivity and faunal richness in ancient terrestrial ecosystems

Timothy S. Myers, Neil J. Tabor, Louis L. Jacobs & Octávio Mateus
In this paper we present a method for estimating soil pCO2 in ancient environments using the measured carbon-isotope values of pedogenic carbonates and plant-derived organic matter. The validity of soil pCO2 estimates proves to be highly dependent on the organic δ13C values used in the calculations. Organic matter should be sourced from the same paleosol profiles as sampled carbonates to yield the most reliable estimates of soil pCO2. In order to demonstrate the potential use...

Data from: Best practices for justifying fossil calibrations

James F. Parham, Philip C. J. Donoghue, Christopher J. Bell, Tyler D. Calway, Jason J. Head, Patricia A. Holroyd, Jun G. Inoue, Randall B. Irmis, Walter G. Joyce, Daniel T. Ksepka, José S. L. Patané, Nathan D. Smith, James E. Tarver, Marcel Van Tuinen, Ziheng Yang, Kenneth D. Angielczyk, Jenny M. Greenwood, Christy A. Hipsley, Jacobs Louis, Peter J. Makovicky, Johannes Müller, Krister T. Smith, Jessica M. Theodor, Rachel C. M. Warnock, Michael J. Benton … & Louis Jacobs
Our ability to correlate biological evolution with climate change, geological evolution, and other historical patterns is essential to understanding the processes that shape biodiversity. Combining data from the fossil record with molecular phylogenetics represents an exciting synthetic approach to this challenge. The first molecular divergence dating analysis (Zuckerkandl and Pauling 1962) was based on a measure of the amino acid differences in the hemoglobin molecule; with replacement rates established (calibrated) using inaccurate paleontological age estimates...

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