Skip to main content

Preprints

Filtering by Subject: Physical Sciences and Mathematics

Performance and Stability Analysis of a GEIOS Proprietary Ionic Nanofluid for Medium to High-Temperature Geothermal Applications

ABDELMOUMEN SHAD SERROUNE, I Rahman KHASANI, Sopaheluwakan Jan, et al.

Published: 2025-03-03
Subjects: Chemical Engineering, Engineering, Engineering Science and Materials, Environmental Sciences, Mechanical Engineering, Other Engineering, Physical Sciences and Mathematics, Physics

This study investigates the performance and stability of a proprietary ionic nanofluid developed by GEIOS Technologies for medium to high-temperature geothermal applications. The nanofluid integrates boron nitride nanoparticles, proprietary surface modifiers, and quantum-optimized additives to enhance thermal conductivity, heat transfer efficiency, and operational stability in closed-loop [...]

Novel Nitrogen Hybrid Gas-Based Nanofoam System for Enhanced Geothermal Applications: Nanogeios and GEIOS Geothermal EQG

ABDELMOUMEN SHAD SERROUNE, I Rahman KHASANI, Sopaheluwakan Jan

Published: 2025-03-03
Subjects: Chemical Engineering, Engineering, Materials Science and Engineering, Physical Sciences and Mathematics, Physics

This study presents a novel nitrogen hybrid gas nanofoam system designed for enhanced geothermal applications, validated through comprehensive laboratory testing. The system integrates a nitrogen gas matrix (95% by volume) infused with engineered aluminum oxide (0.6–0.8% vol) and silica (0.3–0.5% vol) nanoparticles, achieving superior thermal conductivity and fracture stability under simulated [...]

Geometric forward modeling of thrust systems underlying shortening landforms on Mercury

Stephan Ray Loveless, Christian Klimczak, Kelsey Crane, et al.

Published: 2025-02-28
Subjects: Physical Sciences and Mathematics

Mercury hosts thousands of shortening landforms that are widespread across the entire planet. The shortening is widely accepted to be caused by a combination of thrust faulting and folding, resulting from the global contraction of Mercury caused by long, sustained cooling. Most shortening landforms on Mercury’s surface have been classified into one of two groups: lobate scarps or wrinkle ridges. [...]

Neoproterozoic denudation of a Laurentian superbasin

Kalin T. McDannell, C. Brenhin Keller, Robert H. Rainbird, et al.

Published: 2025-02-28
Subjects: Earth Sciences, Geology, Geomorphology, Physical Sciences and Mathematics, Sedimentology, Tectonics and Structure

It has long been speculated that isolated Paleoproterozoic basins of northern Laurentia are remnants of a once contiguous sedimentary cover due to similarities in stratigraphy, paleocurrent directions, sediment provenance, and geochronological data. However, corroborating evidence for this 'superbasin hypothesis' has been lacking outside the footprints of the preserved basins. We present new [...]

Landscapes on the edge: river intermittency in a warming world

Jonah S. McLeod, Alexander C Whittaker, Gary J Hampson, et al.

Published: 2025-02-28
Subjects: Physical Sciences and Mathematics

Sediment transport in rivers is not uniform through time. Highly intermittent systems, which only transport bedload during the most significant flow events, are particularly sensitive to changes in climate and precipitation patterns. Quantifying river intermittency is critical for assessing how fluvial landscapes will respond to projected changes in precipitation extremes due to climate change, [...]

Patterns of deformation in the deepest mantle linked to ancient subduction

Jonathan Wolf, Barbara Romanowicz, Ed Garnero, et al.

Published: 2025-02-25
Subjects: Physical Sciences and Mathematics

Shear wave speeds in Earth's deepest mantle (D") that vary with wave propagation and polarization direction -- a property called seismic anisotropy -- offer insights into mantle convection. To date, global patterns of D" anisotropy have been mostly derived from long wavelength radially anisotropic tomography models, which often disagree except for the large-scale degree-2 pattern. Here, we [...]

Trends and ENSO-related variability in Atlantic tropical cyclone intensity and intensification

Michael K. Tippett, Suzana J. Camargo

Published: 2025-02-23
Subjects: Physical Sciences and Mathematics

This study examined trends and ENSO-related variability in Atlantic tropical cyclone intensity, focusing on 24-h intensification, lifetime maximum intensity (LMI), and rapid intensification (RI) in best-track data during the period 1982–2024.  Previous studies considered trends and ENSO influences separately, reporting upward trends in intensity and more cases of RI during La Niña conditions. [...]

Thirty Years of the Open Geospatial Consortium - History, Present, and Future

Ying-Jung Chen, Wenwen Li, Louis-Martin Losier, et al.

Published: 2025-02-23
Subjects: Engineering, Physical Sciences and Mathematics, Social and Behavioral Sciences

For 30 years, the Open Geospatial Consortium (OGC) has advanced geospatial interoperability through continuous innovation. The OGC provides strategies and Standards that promote adoption, increase efficiencies, create new opportunities, and transform our relationship with the dynamic planet we inhabit. It has fostered global collaborations among companies, governments, academic institutions, and [...]

The Role of Geospatial Intelligence in Modern Military Operations

Emmanuel Kalamji Lutema

Published: 2025-02-21
Subjects: Engineering, Physical Sciences and Mathematics

Geospatial intelligence (GEOINT) has become an indispensable tool in modern military operations since it considerably increases situational awareness, strategic decision-making, and operational success. Advanced geospatial technologies have changed military force collecting, analysis, and spatial data interpretation, including satellite imagery, remote sensing, geographic information systems [...]

Using fracture-scarp lineations as kinematic indicators on active normal fault scarps

Billy James Andrews, Zoe K Mildon, Manuel-lukas Diercks, et al.

Published: 2025-02-21
Subjects: Engineering, Physical Sciences and Mathematics

Reliable kinematic (slip vector) data collected from offset piercing points, corrugations or striations, is a key input for fault based seismic hazard assessments. However, it can be difficult to interpret kinematic indicators on degraded fault scarps. In this work, we investigate the orientations and growth history of on-fault fracture networks, which extend into the footwall and have greater [...]

First empirical assessment of ice content from Himalayan rock glaciers.

Stephan Harrison, Matthew Peacey, Tristram Irvine-Fynn, et al.

Published: 2025-02-21
Subjects: Physical Sciences and Mathematics

Climate warming in the Himalaya threatens glaciers and permafrost, with severe implications for the future sustainability of the region’s natural ‘water towers’ and connected ecological systems and human infrastructure. Recent work in high mountain environments has highlighted how rock glaciers are prevalent and contain globally valuable water supplies. Yet, over the Himalaya, information [...]

The Importance of Geospatial Technology in Monitoring Plant Health

Emmanuel Kalamji Lutema

Published: 2025-02-21
Subjects: Engineering, Life Sciences, Physical Sciences and Mathematics

Solving the problems presented by climate change depends on geospatial technology in great measure. Through shifting pest and disease dynamics, increasing frequency of extreme weather events, and modifying growth circumstances, climate change aggravates problems with plant health. For example, remote sensing data and satellite-based climate models help one to forecast how variations in [...]

Positive isotropic components of the 2025 Santorini-Amorgos earthquakes

Jiri Zahradnik, Efthimios Sokos, Zafeiria Roumelioti, et al.

Published: 2025-02-21
Subjects: Physical Sciences and Mathematics

We used full waveforms of the Hellenic Unified Seismic Network (HUSN) regional stations and a frequency range of 0.03-0.06 Hz. We calculated full moment tensors (MTs) and focused on their ISO and CLVD components. In the tested depth range of 1-20 km, the medians of ISO (=VOL) and CLVD are positive, but their 68% confidence intervals are broad due to the tradeoff of the non-DC with depth. When [...]

Controlled Release Tests Results for the Methane Lidar Camera

Manasi Doshi, Tetsushi Yamada, Scott Quinn, et al.

Published: 2025-02-18
Subjects: Physical Sciences and Mathematics

Methane emissions detection using continuous monitors enables round-the-clock monitoring to quickly identify emissions from oil and gas facilities. The SLB methane lidar camera participated in Stanford University’s 2024 Methane Controlled Release Campaign to characterize its performance at detecting, localizing, and quantifying methane emissions from different sources. The camera successfully [...]

Pushing and pulling an algal bloom: physical controls of diel variability in nearshore phytoplankton communities

medea zanoli, Gotzon Basterretxea, Idan Tuval

Published: 2025-02-17
Subjects: Physical Sciences and Mathematics

High-biomass microalgal blooms frequently occur in littoral environments worldwide, often causing noxious effects on aquatic ecosystems and coastal communities. Here, we combine field observations and a simple retention-dispersion model to disentangle the short-term (hours) environmental drivers shaping the nearshore dynamics of such outbreaks. Temperature, salinity, fluorescence, current [...]

search

You can search by:

  • Title
  • Keywords
  • Author Name
  • Author Affiliation