Results 141 to 150 of about 6,935 (243)

A Calculation Model for Hydraulic Cutting Torque in Offshore Oil Fields Considering the Dynamics of Drill String

Shiyou jixie
Hydromechanical cutters are commonly used in offshore oilfields to cut previous sand-control strings and casing during wellbore preparation prior to the drilling of adjustment wells.
Hu Jinyang, Xu Gang, Jia Lixin, Zhang Shuai, Zhou Jianhui, Zhang Hui   +5 more
doaj  

Research and Application of Optimal Placement of Hydraulic Oscillator

Shiyou jixie, 2016
Sliding drilling in complex well often encounters serious weight stacking,resulting in inadequate WOB and low ROP.Hydraulic oscillator introduces an axial oscillating motion on the drilling string by axial vibration,so to transfer the static friction ...
Zhang Kang, Feng Qiang, Wang Jianlong, Zhang Ruguang, Yu Zhiqiang, Xia Heming   +5 more
doaj  

Analysis of drilling vibration characteristics of anchoring system in coal mine. [PDF]

Sci Rep, 2023
Xie M, Li Y, Zhang H, Yang Z, Ren Z, Nie R.   +5 more
europepmc   +1 more source

Evidence for Limited Atmospheric CO2 Rise at the Miocene Climatic Optimum

Paleoceanography and Paleoclimatology, Volume 41, Issue 6, June 2026.
Abstract The Miocene Climatic Optimum (MCO; 16.9–14.7 Ma) was a relatively warm period with atmospheric CO2 averaging ∼500 μatm but CO2 change across its onset is poorly documented. We present a record of algal 13C‐fractionation covering the Early to Middle Miocene (∼18.5–15 Ma), with a gap at the MCO onset, from Ocean Drilling Program Site 959 in the ...
Evi Wubben, Joost Frieling, Yannick F. Bats, Linda van Roij, Kirsten de Haan, Gert‐Jan Reichart, Francien Peterse, Francesca Sangiorgi, Marcel T. J. van der Meer, Appy Sluijs   +9 more
wiley   +1 more source

Martian Proton Albedo as Signature of Near‐Surface Water

Journal of Geophysical Research: Planets, Volume 131, Issue 6, June 2026.
Abstract Understanding the Martian soil water budget is crucial not only for in situ resource utilization in future human missions to Mars, but also for reconstructing the geological and climatic history of the planet, as well as to assess the potential of ancient or even present microbial life.
Jan Leo Löwe, Robert F. Wimmer‐Schweingruber, Salman Khaksari, Sven Löffler, Sergey Nikiforov, Maya Djachkova, Jingnan Guo, Gabin Charpentier, Bent Ehresmann, Donald M. Hassler, Daniel Matthiä, Thomas Berger, Günther Reitz, Cary Zeitlin   +13 more
wiley   +1 more source

Predation on Artificial Caterpillars Varies With Vertical Stratification but Not Light Gradients in a Sugar Maple Temperate Forest

Entomologia Experimentalis et Applicata, Volume 174, Issue 6, Page 559-569, June 2026.
Predation pressure varies vertically, with highest arthropod predation in the understory and highest bird predation in the canopy. Light availability differs across vertical strata, but predation patterns are more strongly influenced by height and forest structure than by light gradients.
Mahsa Hakimara, Emma Despland
wiley   +1 more source

Morphological ontogeny and growth patterns of gold‐ringed octopus Amphioctopus fangsiao: Implications for aquaculture development

Journal of the World Aquaculture Society, Volume 57, Issue 3, June 2026.
Abstract To evaluate the aquaculture potential and developmental characteristics of the holobenthic octopus Amphioctopus fangsiao, we conducted artificial breeding and continuous rearing of Amphioctopus fangsiao from hatching to 150 days post‐hatching (dph) under laboratory conditions using broodstock collected from Fujian, China.
Juanwen Yu, Jinchao Zhu, Siqing Chen, Tianshi Zhang, Qing Chang, Li Bian   +5 more
wiley   +1 more source

MODELING THE DYNAMICS OF THE CIRCULATION SUB OF THE DRILL STRING

PNIPU Bulletin.The mechanical engineering, materials science, 2019
Alexey Kobityansky, Alexander Mulkov, Vladimir Beloborodov   +2 more
openaire   +1 more source

Shaping future forests: how can ecophysiology support climate‐smart forest management?

New Phytologist, Volume 250, Issue 5, Page 2778-2813, June 2026.
Summary Climate change, particularly the associated increase in extreme events and disturbances, threatens the numerous environmental, social, and economic benefits that forests provide, both locally and globally. Heat and drought pose significant risks to forest ecosystems; the anticipated future climate is expected to exacerbate this trend ...
Arthur Gessler, José M. Grünzweig, Laura Bigio, Henrik Hartmann, Nate McDowell, Frank Krumm, Arun K. Bose, Andreas Rigling, Harald Bugmann, Valentina Vitali, Pascal Schneider, J. Jelle Lever, Janine Schweier, Anne Kempel, Niklaus E. Zimmermann, Philipp Brun, Jürgen Bauhus, Micah Wilhelm, Alessandra Bottero   +18 more
wiley   +1 more source

Aspects of finite temperature corrections in string theory

, 2011
PhDIn this thesis some aspects of temperature corrections in string theory are analyzed: in particular, we study the thermal contributions to the 4 dimensional effective potential arising from string theory compactifications.
Calo, Vincenzo
core