Results 41 to 50 of about 9,012 (266)

Geological History of the Dry Valleys, Antarctica, Based on the Stable Isotope Studies

Antarctic Record, 1977
In 1973, DVDP 4 drilling was performed to obtain unconsolidated sediments of Lake Vanda, McMurdo Oasis. The cored sediments were found to contain layered salt concretions composed of gypsum, thenardite and calcite.
Nobuyuki NAKAI, Yoshihiko MIZUTANI
doaj   +1 more source

Optimized Selenium‐Doped Nanocomposites for Enhanced Polymer Gel Performance in Permeability Reduction

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT Excessive water production in mature oil fields necessitates robust shut‐off treatments, yet conventional polymer gels often fail under high‐temperature and high‐salinity conditions. This study aims to enhance gel thermal stability and mechanical strength by incorporating selenium‐doped Ag/AgO–ZnO nanocomposites synthesized via a novel green ...
Fadhil F. Sead, Farag M. A. Altalbawy, M. Sudhakara Reddy, Badri Narayan Sahu, Sridharan Sundharam, Sanjeev Kumar, Atreyi Pramanik, Aseel Smerat, Fatimah Pashtun   +8 more
wiley   +1 more source

Stability of Saltwater‐Freshwater Mixing Zones in Beach Aquifers With Geologic Heterogeneity

Water Resources Research
Saltwater‐freshwater mixing zones in beach aquifers support biogeochemical reactions that moderate chemical loads in fresh groundwater discharging to marine ecosystems.
Olasunkanmi Olorunsaye, James W. Heiss
doaj   +1 more source

Upper Cambrian-Ordovician reservoir characteristics in Well Gucheng-4 area, Tarim Basin

Petroleum Exploration and Development, 2008
: Based on the data of regional geologic background, core, and thin section, this paper studies the characteristics of sedimentary facies and reservoirs of the Upper Cambrian-Ordovician in Well Gucheng-4, Tarim Basin, and points out the potential and ...
Chang-jian ZHU, Zhong-yao XIAO, Bao-min ZHANG, Ying-ai JIN, Hong SANG, Yong-fu LIU, Qing-ning DANG   +6 more
doaj   +1 more source

Impact of Cattaneo–Christov Heat and Mass Flux on MHD Hybrid Nanofluid Flow Over an Extending Surface With Convective and Mass Flux Effects

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT This study investigates the flow of a magnetized hybrid nanofluid over a permeable stretching surface. The mass and thermal transport within the system is regulated using the Cattaneo–Christov flux theory. The fluid is additionally subjected to thermophoresis, chemical reaction, Brownian motion, and activation energy effects.
Ebrahem A. Algehyne, Abdul Bariq, Mounirah Areshi, Fahad Maqbul Alamrani, Zehba Raizah, Izharul Haq, Anwar Saeed   +6 more
wiley   +1 more source

The oldest stratigraphic record of the Late Cretaceous shark Ptychodus mortoni Agassiz, from Vallecillo, Nuevo León, northeastern Mexico

Revista Mexicana de Ciencias Geológicas, 2018
In this paper we report the oldest geologic world record of Ptychodus mortoni, from the Vallecillo Member (Agua Nueva Formation), at Vallecillo, Nuevo León, northeastern Mexico.
Alberto Blanco-Piñón, Luis M. Garibay-Romero, Jesús Alvarado-Ortega   +2 more
doaj  

The Geological Survey of Canada sedimentation flume

, 1972
A recirculating, tiltable, sedimentation flume has been constructed, primarily for research on fluvial processes, although the apparatus can be adapted easily to studies of lacustrine and certain beach phenomena. The main channel is 18. 3 metres long, O. 76 metres wide, and O. 6 metres deep. A transparent acrylic section 5 metres long exists in each of
openaire   +1 more source

Synergistic Physicochemical Inhibition of Reactive Shale Formations Using Hydrothermally Synthesized Hydroxyapatite Nickel Tungstate Nanocomposites in Water‐Based Drilling Fluids

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT Wellbore instability driven by the volumetric expansion of reactive shale formations remains a primary operational challenge in modern drilling engineering, causing severe mechanical failures and substantial economic deficits. The objective of this study is to formulate and evaluate a novel dual‐action chemical additive capable of ...
Ghaleb Oriquat, Basim Abdul Alrhym, A. C. Umamaheshwer Rao, Shivam P. Chaudhary, Pardeep Singh Bains, Ripendeep Singh, Murotov Nurshod, Rasulbek Eshmetov, Ahmad Abumalek   +8 more
wiley   +1 more source

Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA

Arctic, Antarctic, and Alpine Research, 2021
The Ziegler Reservoir fossil site near Snowmass Village, Colorado, provides a rare opportunity to examine environmental conditions in the Rocky Mountains during marine isotope stage (MIS) 4 (71–57 ka).
Jeffrey S. Honke, Jeffrey S. Pigati, J. Michael Daniels   +2 more
doaj   +1 more source

Bioconvective Unsteady Casson Hybrid Nanofluid Flow on a Variable Darcy Regime Between Two Rotating Disks With Variable Heat Source

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT This study carries significant consequences in various engineering applications, such as cooling rotating disk surfaces, improving chemical reactor performance, and designing filtration systems. Considering these main applications in view, the aim of this study is to investigate time‐dependent Casson hybrid nanofluid flow on a permeable ...
Ebrahem A. Algehyne, Abdul Bariq, Mounirah Areshi, Fahad Maqbul Alamrani, Zehba Raizah, Izharul Haq, Anwar Saeed   +6 more
wiley   +1 more source