Results 31 to 40 of about 189,897 (216)

Chironomid‐based summer temperature reconstruction of the Eemian–Weichselian transition at Lichtenberg, northern Germany

Boreas, EarlyView.
Understanding the temperature variability of past interglacial cycles is essential to predict future climates. We present a new summer temperature reconstruction, based on the subfossil chironomid record from a small palaeolake adjacent to the Middle Palaeolithic site of Lichtenberg, northern Germany. The record spans from the Saalian late glacial over
Sonja Rigterink, Bartosz Kotrys, Michael Hein, Xuan Li, Neda Rahimzadeh, Agnieszka Gruszczyńska, Marcel Weiss, Brigitte Urban, David Colin Tanner, Tobias Lauer, Antje Schwalb   +10 more
wiley   +1 more source

CFO overconfidence, environmental violations, and firm performance. The moderating role of constituency statutes

European Management Review, EarlyView.
Abstract This study examines the relationship between Chief Financial Officer (CFO) overconfidence and firm performance through the lens of environmental violations and constituency statutes. Drawing on stakeholder and upper echelons theories, we find that firms with overconfident CFOs are more likely to commit environmental violations, which ...
Panagiotis Andrikopoulos, Shee‐Yee Khoo, Patrycja Klusak, Yurtsev Uymaz, Huong Vu   +4 more
wiley   +1 more source

Physics‐Constrained Variational Autoencoder for Uncertainty Quantification of Full Waveform Inversion

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 5, October 2026.
Abstract We propose a variational autoencoder framework to directly assess uncertainties in subsurface models produced by single‐ and multiparameter full waveform inversion (FWI). The new method does not require pretraining on labeled data, thus it significantly reduces computational cost and storage requirements.
Abdelrahman Elmeliegy, Mrinal K. Sen, Arnab Dhara, Jennifer Harding, Hongkyu Yoon   +4 more
wiley   +1 more source

An Amphiphilic Multiblock Polymer as a High-Temperature Gelling Agent for Oil-Based Drilling Fluids and Its Mechanism of Action

Gels, 2023
Oil-based drilling fluids are widely used in challenging wells such as those with large displacements, deepwater and ultra-deepwater wells, deep wells, and ultra-deep wells due to their excellent temperature resistance, inhibition properties, and ...
Yinbo He, Mingliang Du, Jing He, Haiyang Liu, Yanhua Lv, Lei Guo, Peng Zhang, Yunhai Bai   +7 more
doaj   +1 more source

Simulated Ocean Oxygen Under Miocene Boundary Conditions

Paleoceanography and Paleoclimatology, Volume 41, Issue 10, October 2026.
Abstract The Miocene Climatic Optimum (MCO; 16.9–14.7 Ma) was a warm interval with atmospheric CO2 ${\text{CO}}_{2}$ comparable to end‐of‐21st‐century projections under intermediate emission scenarios. Proxy records indicate the Oxygen Minimum Zone (OMZ) in the Eastern Tropical Pacific (ETP) was small or non‐existent during the MCO, expanding only when
James R. Berg, David K. Hutchinson, Katrin J. Meissner, Benoît Pasquier, Mark Holzer, Alexandra Auderset   +5 more
wiley   +1 more source

Numerical Investigation of Wellbore Stability in Deepwater Shallow Sediments

Geofluids, 2021
An elaborate poro-elastoplastic numerical model has been developed in this paper to explore the stability characteristics of wellbore in shallow sediments of deepwater oil/gas wells.
Wei Liu, Hai Lin, Hailong Liu, Chao Luo, Guiping Wang, Jingen Deng   +5 more
doaj   +1 more source

Wellbore multiphase flow behaviors during gas invasion in deepwater downhole dual-gradient drilling based on oil-based drilling fluid

Energy Reports, 2022
Knowledge of wellbore multiphase flow characteristics is important for early gas invasion identification and treatment, especially in oil-based drilling fluid.
Hongwei Yang, Jun Li, Geng Zhang, Hui Zhang, Boyun Guo, Wang Chen   +5 more
doaj   +1 more source

Temperature, Sea Ice, Depth, and Traits Drive Fish Distributions in the Barents Sea

Diversity and Distributions, Volume 32, Issue 10, October 2026.
ABSTRACT Aim Marine species are increasingly impacted by climate change, forcing them to adapt or redistribute to remain within their environmental niches. How the combined effects of environmental gradients and species traits influence the distribution of species with distinct biogeographic affinities remains poorly understood.
Shannon E. Moore, Federico Maioli, Marcel Montanyès Solé, Raul Primicerio, Laurene Pecuchet   +4 more
wiley   +1 more source

Study on Three-Dimentional Vibration Response Characteristics of Drilling String in Deepwater Riserless Drilling

Shiyou jixie, 2022
In deepwater riserless drilling system,drill string in seawater is affected by external ocean load,torque of top rotary table and bottom bit-formation force,so it is prone to vibrate in the three directions of longitudinal,transverse,and torsional,making
Liu Jun, Chen Feiyu, Li Jian, Guo Xiaoqiang   +3 more
doaj  

PRESSURE PREDICTION AND UNDERBALANCED DRILLING IN THE DEEPWATER NIGER DELTA [PDF]

, 2012
The mechanisms that cause overpressure can be broadly classified into two categories: loading and unloading. This study looks at eight wells from the deepwater Niger Delta; the wells were evaluated with three aims in mind. The first aim was to determine
GOODWYNE, OLAR,KAMAL
core