Results 71 to 80 of about 204,393 (382)

Earliest Triassic microbialites in the South China Block and other areas; controls on their growth and distribution [PDF]

, 2007
Earliest Triassic microbialites (ETMs) and inorganic carbonate crystal fans formed after the end-Permian mass extinction (ca. 251.4 Ma) within the basal Triassic Hindeodus parvus conodont zone.
A Baud, A Baud, A Sandler, AD Woods, Alan Reynolds, AME Winguth, B Beauchamp, C Armella, CB Foster, D Chen, DH Erwin, DJ Lehrmann, DJ Lehrmann, DL Kidder, DL Lehrmann, E Garzanti, E Heydari, ES Krull, G Ryskin, H Sano, H Yang, J Haas, J Payne, J Tong, JJ Dravis, JJ Sepkoski Jr, JK Schubert, JM Kennard, JP Grotzinger, JT Kiehl, K Grice, K Grice, K Hips, K Kaiho, K Perch-Nielsen, L Krystyn, Li Guo, LR Kump, M Calner, MA Sephton, ME Brookfield, ML Fraiser, MR Saltzman, MT Whalen, N Sheldon, O Weidlich, P Sheehan, PB Wignall, PB Wignall, Pierre-Yves Collin, Qinglai Feng, R Riding, R Riding, R Riding, RA Berner, RF Dill, RJ Twitchett, RJ Twitchett, RK Goldhammer, RM Hotinski, S Crasquin-Soleau, S Crasquin-Soleau, S Kempe, S Kershaw, S Kershaw, S Kershaw, S Wang, SB Pruss, SH Bottrell, Steve Kershaw, Sylvie Crasquin-Soleau, W Wang, Xinan Mu, Y Ezaki, Y Isozaki, Y Kakuwa, Y Wang, Yue Li   +77 more
core   +2 more sources

Prima Facie Questions in Quantum Gravity [PDF]

, 1993
The long history of the study of quantum gravity has thrown up a complex web of ideas and approaches. The aim of this article is to unravel this web a little by analysing some of the {\em prima facie\/} questions that can be asked of almost any approach to quantum gravity and whose answers assist in classifying the different schemes.
arxiv   +1 more source

Manganese Neurotoxicity and Familial Disorders of Manganese Transport

Annals of the Child Neurology Society, EarlyView.
ABSTRACT Manganese is the 12th most common element in the Earth's crust and is an essential industrial component. Biologically, this metal plays an important role as a constituent of numerous enzymes. While manganese is required for normal biochemical and physiological processes, manganese excess can lead to significant toxicity, particularly to the ...
Sidney M. Gospe Jr.
wiley   +1 more source

Environmental distribution of Bathonian (Middle Jurassic) neoselachians in southern England [PDF]

, 2004
Within the Bathonian (Middle Jurassic) a wide range of depositional environments were present across Britain. Within this dominantly carbonate shelf setting, there is a general palaeoenvironmental transition from open marine shelf in the south of England,
Underwood, Charlie J., Ward, D.J.
core  

Learnable Gabor kernels in convolutional neural networks for seismic interpretation tasks [PDF]

arXiv, 2023
The use of convolutional neural networks (CNNs) in seismic interpretation tasks, like facies classification, has garnered a lot of attention for its high accuracy. However, its drawback is usually poor generalization when trained with limited training data pairs, especially for noisy data.
arxiv  

SO(2,4)-covariant quantization of the Maxwell field in a conformally flat space [PDF]

Phys. Rev. D 87, 064040 (2013), 2012
We present an SO(2,4)-covariant quantization of the free electromagnetic field in conformally flat spaces (CFS). A CFS is realized in a six-dimensional space as an intersection of the null cone with a given surface. The smooth move of the latter is equivalent to perform a Weyl rescaling.
arxiv   +1 more source

Wetlands as environments of early human occupation: A new classification for freshwater palaeowetlands

The Depositional Record, EarlyView.
A new classification for inland freshwater palaeowetlands to be used in the field or core laboratory by sedimentologists, providing examples from the Guadix Basin (southern Spain). Abstract Present wetlands have proven to be delicate, biodiverse ecosystems, that are natural sinks for CO2 and act as good indicators for climate changes.
S. Pla‐Pueyo, E. H. Gierlowski‐Kordesch   +1 more
wiley   +1 more source

New data on depositional environment of Jurua Formation terminal sediments, Solimoes Basin, Brazil

Georesursy, 2019
It has been for the first time established on the core taken from two wells that JR10 reservoir sediments (Upper Jurua, Formation Carboniferous) were deposited in the conditions of deltaic and alluvial coast with semiarid climate and in marine ...
M.V. Lebedev, A.V. Khramtsova, A.P. Vilesov, M.P.G. Souza, А. Netto   +4 more
doaj   +1 more source

Modern and ancient tidal sedimentary systems in the era of energy transition: Introduction to the special volume of The Depositional Record

The Depositional Record, EarlyView.
This volume examines tidal sedimentary systems through 11 articles, spanning ancient and modern tidalites, technological advances and implications for human management. Highlighting contributions from Tidalites 2022 and beyond, it underscores tidalites' significance in sedimentology, environmental forecasting and energy transition, reflecting decades ...
Sergio G. Longhitano, Valentina M. Rossi, Domenico Chiarella   +2 more
wiley   +1 more source

Generic Forward Curve Dynamics for Commodity Derivatives [PDF]

arXiv, 2023
This article presents a generic framework for modeling the dynamics of forward curves in commodity market as commodity derivatives are typically traded by futures or forwards. We have theoretically demonstrated that commodity prices are driven by multiple components.
arxiv