Results 81 to 90 of about 219,276 (273)

Characteristics of Deformation and Damage of Multi‐Thin Composite Oil Shale Top Plate Under the Influence of Different Factors

Energy Science &Engineering, EarlyView.
In this study, the key control mechanism of surrounding rock stability is revealed by theoretical analysis and UDEC‐Trigon numerical simulation method, aiming at the problem that oil shale roof is prone to separation and slip deformation under complex stress.
Jiang Xiao, Yujiang Liu, Yihui Wang, Boyuan Zhang, Yulin Wang, Tongxiaoyu Wang   +5 more
wiley   +1 more source

Are lipids always depleted? Comparison of hydrogen, carbon, and nitrogen isotopic values in the muscle and lipid of larval lampreys.

PLoS ONE
Stable isotope ratios in organisms can be used to estimate dietary source contributions, but lipids must first be accounted for to interpret values meaningfully.
Thomas M Evans, Shale Beharie
doaj   +1 more source

Acoustic and fractal analyses of the mechanical properties and fracture modes of bedding‐containing shale under different seepage pressures

Energy Science & Engineering, 2020
The mechanical properties and failure modes of shale that contains bedding were analyzed under coupled seepage pressure and stress. In the numerical model, seven sets of shale samples with different dip‐bedding values were considered, and a seepage ...
Zhonghu Wu, Yili Lou, Shuai Yin, Anli Wang, Hao Liu, Wenjibin Sun, Yujun Zuo, Bin Chen   +7 more
doaj   +1 more source

Jet Flow Field Analysis of Convergent‐Divergent Nozzle for Hydraulic Perforation for Natural Gas Hydrates

Energy Science &Engineering, EarlyView.
Combining the nozzle structure and wellbore size of the second natural gas hydrate trial production, the CFD is employed to analyze the internal and external flow fields of convergent–divergent cavitation nozzle. Analyzing the influence of various structural parameters of the nozzle on its jet performance, and the nozzle configuration with optimal jet ...
Wang Yingsheng, Yu Yanjiang, Shen Kaixiang, Zhou Jiawei, Zhang Kewei, Zeng Jing   +5 more
wiley   +1 more source

Shale Play: Poems and Photographs from the Fracking Fields by Julia Spicher Kasdorf and Steven Rubin [PDF]

, 2019
Review of Julia Spicher Kasdorf and Steven Rubin\u27s Shale Play: Poems and Photographs from the Fracking ...
Shepherd, Kelly
core   +1 more source

On the Comovement of Contango and Backwardation Across Futures Commodity Markets

Journal of Futures Markets, EarlyView.
ABSTRACT We examine the time‐varying nature of the comovement of the slope of the futures curve in major agricultural, metals and energy commodity futures markets in a Global Vector Autoregressive model. We find significant comovement between the slopes, indicating the co‐existence of backwardation and contango in many seemingly unrelated commodity ...
Angelo Luisi, Francesco Roccazzella, Athanasios Triantafyllou   +2 more
wiley   +1 more source

Biomineralization of primary carbonate cements: a new biosignature in the fossil record from the Anisian of Southern Italy

Lethaia, EarlyView., 2021
Biomineralization is a generic term used to indicate biological‐mediated mineral formation. In carbonate mineralization, nucleation of crystals can be: (1) controlled directly by the organisms, like in the skeletal formation of most metazoans; (2) induced by microbial communities, by indirect precipitation mediated by their metabolic activities; or (3)
Adriano Guido, Matteo Sposato, Giuseppe Palladino, Alessandro Vescogni, Domenico Miriello   +4 more
wiley   +1 more source

Why Do Hedgers Hedge? The Role of Ambiguity

Journal of Futures Markets, EarlyView.
ABSTRACT This paper investigates whether ambiguity influences hedging behavior in commodity futures markets. Using high‐frequency crude oil futures data, distinct measures of risk and ambiguity are linked to weekly hedging positions from the Commodity Futures Trading Commission (CFTC).
Fiona Höllmann
wiley   +1 more source

Book Review ~ Handbook of Online Learning Innovations in Higher Education and Corporate Training. Editors: Kjell Erik Rudestam and Judith Schoenholtz-Read

International Review of Research in Open and Distributed Learning, 2003
If you take this volume at face value, based on the title, you will likely wonder, as I did, how the combination of “online learning,” “innovation in higher education,” and “corporate training” could coherently co-exist within a “handbook.” However, the ...
Reviewed by Douglas Shale
doaj  

Political alternation as a restraint on investing in influence : evidence from the post-communist transition [PDF]

The authors develop and implement a method for measuring the frequency of changes in power among distinct leaders and ideologically distinct parties that is comparable across political systems.
Hoff, Karla, Horowitz, Shale, Milanovic, Branko   +2 more
core