Results 41 to 50 of about 857 (182)

Improved Constraints on Andean Glaciations From the Lake Titicaca Continental Drilling Record

Paleoceanography and Paleoclimatology, Volume 41, Issue 6, June 2026.
Abstract Long sedimentary records from tropical lakes provide crucial archives for reconstructing the timing and extent of tropical alpine glaciations, yet robust chronologies beyond the radiocarbon limit (ca. 50 ka) remain scarce. Here, we refine the ca. 350 kyr chronology for Lake Titicaca (Peru‐Bolivia) using radiocarbon dating, optically stimulated
Victoria L. Todd, Timothy M. Shanahan, Daniel Stockli, Axel K. Schmitt, Steven Forman, Sherilyn C. Fritz, Paul A. Baker, Geoffrey O. Seltzer   +7 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  

The Impact of Acquisition Intensity on ESG Performance

Business Strategy and the Environment, Volume 35, Issue 4, Page 4861-4875, May 2026.
ABSTRACT This study investigates the impact of Acquisition Intensity on ESG performance using a panel of 1,736 US‐listed companies from 2002 to 2023. Employing a robust OLS framework, we assess both Value‐Based and Volume‐Based Acquisition Intensity against overall ESG scores and their environmental, social, and governance pillars, controlling for firm
Ugbede Amedu, Paraskevas Pagas, Arief Daynes   +2 more
wiley   +1 more source

Element concentrations in tissues reveal spatial structure of Atlantic walrus management stocks

The Journal of Wildlife Management, Volume 90, Issue 4, May 2026.
Differences in tissue element concentrations confirm geographic differentiation between 2 of Canada's walrus management stocks but reveal additional spatial structure within the largest stock that may have management implications. Abstract Ensuring harvested animal populations are managed at appropriate scales requires an understanding of underlying ...
Alexander M. Jardine, Jennifer F. Provencher, Mary Gamberg, Cory J. D. Matthews   +3 more
wiley   +1 more source

Methodology for kick tolerance calculation and well killing in deepwater drilling

Natural Gas Industry B, 2016
Kick tolerance is a key parameter to indicate whether shut-in operation can be carried out safely and a proper well killing method should be chosen in well drilling.
Yequan Jin, Cheng Li, Qian Wu
doaj   +1 more source

Bacteria-Oil Microaggregates Are an Important Mechanism for Hydrocarbon Degradation in the Marine Water Column

mSystems, 2021
Vast quantities of oil-associated marine snow (MOS) formed in the water column as part of the natural biological response to the Deepwater Horizon drilling accident. Despite the scale of the event, uncertainty remains about the mechanisms controlling MOS
Amanda M. Achberger, Shawn M. Doyle, Makeda I. Mills, Charles P. Holmes, Antonietta Quigg, Jason B. Sylvan   +5 more
doaj   +1 more source

Air Contamination and Mass Fractionation Correction in Groundwater From a Hydrocarbon System

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract Noble gases are valuable geochemical tracers for investigating subsurface fluid origins and migration because of their chemical inertness and source‐specific isotopic ratios. However, subsurface water samples often show noble gas patterns that differ from air‐saturated water references, with excesses or depletions that complicate ...
S. Diniz, A. Battani, J. Scott, G. Galliero, S. Gilfillan, M. Pujol   +5 more
wiley   +1 more source

Recoil Control of Deepwater-Drilling Riser with Optimal Guaranteed Cost H_∞ Control

Applied Sciences, 2022
In deepwater-drilling engineering, it is necessary to disconnect the bottom equipment of the lower marine-riser package from the blowout preventer when encountering multi-hazard environmental factors.
Yue-Ting Sun, Yan-Dong Zhao, Bao-Lin Zhang, Wei Zhang, Hao Su   +4 more
doaj   +1 more source

Genetic Diversity and Population Structure of Squalus cf. mitsukurii (Chondrichthyes: Squalidae) Revealed by ddRAD Sequencing

Animal Genetics, Volume 57, Issue 2, April 2026.
ABSTRACT Assessing genetic structure across ocean basins is essential to understand connectivity and guide conservation in data‐deficient open‐water sharks. In this study, we examined the population genomics of Squalus cf. mitsukurii by analyzing tissue samples collected from two distant regions: California, USA (Pacific Ocean) and Pernambuco, Brazil ...
Aisni Mayumi Corrêa de Lima Adachi, Ailton Amarante Ariza, Giovana da Silva Ribeiro, Pollyana Christine Gomes Roque, Matheus Marcos Rotundo, Marcelo Vianna, Gabriela Delpiani, Sergio Matias Delpiani, Juan Martín Díaz de Astarloa, Claudio Oliveira, Fausto Foresti, Vanessa Paes da Cruz   +11 more
wiley   +1 more source

Gas kick and lost circulation risk identification method with multi-parameters based on support vector machine for drilling in deep or ultradeep waters

Engineering Science and Technology, an International Journal
In deepwater and ultra-deepwater drilling, formation pressures are complex and the drilling fluid density window is narrow, which makes it prone to well control incidents such as kicks and lost circulation.
Kai Feng, Shujie Liu, Zhiming Yin, Yi-long Xu, Meipeng Ren, Deqiang Tian, Bangtang Yin, Baojiang Sun   +7 more
doaj   +1 more source