Browsing Institutt for geovitenskap og petroleum by Document Types "Peer reviewed"
Now showing items 21-40 of 612
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Acoustic signals in air and water generated by very shallow marine seismic sources: An experimental study
(Peer reviewed; Journal article, 2020)When a marine seismic source, like an airgun, is fired close to the water surface the oscillating bubble interacts with the water–air interface. The main interest for seismic applications is how this effect impacts the ... -
Acoustically induced cavity cloud generated by air-gun arrays—Comparing video recordings and acoustic data to modeling
(Journal article; Peer reviewed, 2018)For seismic air-gun arrays, ghost cavitation is assumed to be one of the main mechanisms for high-frequency signal generation. Ghost cavitation signals are weak for seismic frequencies (<300 Hz) and do not contribute to ... -
Adaptive Proxy-based robust production optimization with multilayer perceptron
(Peer reviewed; Journal article, 2022)Machine learning (ML) has been a technique employed to build data-driven models that can map the relationship between the input and output data provided. ML-based data-driven models offer an alternative path to solving ... -
Adsorptive Removal Behavior of Pb (II) and Cr (VI) Pollutants from an Aqueous Environment onto Polyaniline-Modified MIL100(Fe)
(Peer reviewed; Journal article, 2023)The present work introduces a new sorbent, so-called PANI/MIL100(Fe), for removing Pb (II) and Cr (VI) from wastewater. The successful preparation of PANI/MIL100(Fe) was verified via Fourier-transform infrared spectroscopy ... -
Adsorptive retention of copper from acidic mine water at the disused sulphide mine at Lokken, central Norway - initial experiments using olivine
(Peer reviewed; Journal article, 2004)This paper investigates the chemical potential of using forsterite olivine to remove copper from acidic mine water through the actions of neutralisation and adsorption. The study was initiated by The Norwegian Directorate ... -
Advanced Simulation of Quartz Flotation Using Micro-Nanobubbles by Hybrid Serving of Historical Data (HD) and Deep Learning (DL) Methods
(Peer reviewed; Journal article, 2023)The present study investigates the optimization and advanced simulation of the flotation process of coarse particles (–425 + 106) using micro-nanobubbles (MNBs). For this purpose, flotation experiments in the presence and ... -
Advanced simulation of removing chromium from a synthetic wastewater by rhamnolipidic bioflotation using hybrid neural networks with metaheuristic algorithms
(Peer reviewed; Journal article, 2021)This work aims at presenting an advanced simulation approach for a novel rhamnolipidic-based bioflotation process to remove chromium from wastewater. For this purpose, the significance of key influential operating variables ... -
AEM in norway: A review of the coverage, applications and the state of technology
(Peer reviewed; Journal article, 2021)From the first use of airborne electromagnetic (AEM) systems for remote sensing in the 1950s, AEM data acquisition, processing and inversion technology have rapidly developed. Once used extensively for mineral exploration ... -
Alginates as Green Flocculants for Metal Oxide Nanoparticles
(Peer reviewed; Journal article, 2023)Flocculation is used for the removal or separation of colloids, e.g. in water treatment and mineral processing. Alginates are linear, anionic biopolymers composed of mannuronic (M) and guluronic (G) acids. The relative ... -
An anelliptic approximation for geometrical spreading in transversely isotropic and orthorhombic media
(Journal article; Peer reviewed, 2018)The relative geometric spreading along the raypath contributes to the amplitude decay of the seismic wave propagation that needs to be considered for amplitude variation with offset or other seismic data processing methods ... -
Analysis of cuttings concentration experimental data using exploratory data analysis
(Peer reviewed; Journal article, 2022)Cuttings transportation is a complex phenomenon involving many inter-acting variables. Experimental investigations on cuttings transport are carried out by different research groups for decades and varying findings are ... -
Analysis of Squeezing Phenomenon in the Headrace Tunnel of Chameliya Project, nepal
(Journal article; Peer reviewed, 2013)The headrace tunnel of Chameliya Hydroelectric Project, Nepal has faced severe squeezing problems from chainage 3+100m to 3+900m. Due to the severe squeezing and deformation, the tunnel cross section has narrowed considerably ... -
Analysis of the plastic deformation behavior of schist and schistose mica gneiss at Khimti headrace tunnel, Nepal
(Journal article; Peer reviewed, 2014)The Khimti headrace tunnel experienced instability related to tunnel deformations in several tunnel stretches through mica schist and schistose mica gneiss rock mass. The monitored convergence pattern indicated that the ... -
Analysis of the stabilising effect of ribs of reinforced sprayed concrete(RRS) in the Løren road tunnel
(Journal article; Peer reviewed, 2018)The Løren tunnel is a road tunnel at Ring road 3 in Oslo, Norway. The tunnel has a length of 915 m in rock, has two tubes with three lanes and breakdown fields, and was first opened in 2013. For rock support in the case ... -
Analysis of unlined pressure shafts and tunnels of selected Norwegian hydropower projects
(Journal article; Peer reviewed, 2018)Norwegian hydropower industry has more than 100 years of experiences in constructing more than 4000 km-long unlined pressure shafts and tunnels with maximum static head of 1047 m (equivalent to almost 10.5 MPa) reached at ... -
Analysis of water ingress, grouting effort, and pore pressure reduction caused by hard rock tunnels in the Oslo region
(Peer reviewed; Journal article, 2022)Many subsurface projects in Scandinavia face challenges with settlement risk from water ingress into tunnels, due to challenging ground conditions featuring hard bedrock underlying soft, marine clay deposits. Pore pressure ... -
Analysis on the Dynamics of Burst Debris Flood at the Inclined Pressure-Shaft of Svandalsflona Hydropower Project, Norway
(Journal article; Peer reviewed, 2014)Longterm stability of the waterway system of the hydropower plants is crucial and should not be underestimated. The compromise may result in severe economic consequences related to revenue loss caused by the plant closedown ... -
Analytical modeling of sub-surface porous reservoir compaction
(Journal article; Peer reviewed, 2018)Fluid extraction has led to compaction, land subsidence, flooding and even earthquakes many places around the world. Although rare, the environmental costs could be overwhelming. Once compaction has been identified, possible ... -
Anatomy of a deep crustal volcanic conduit system; The Reinfjord Ultramafic Complex, Seiland Igneous Province, Northern Norway
(Peer reviewed; Journal article, 2016)The Reinfjord Ultramafic Complex, Seiland Igneous Province represents a lower crustal magma chamber (25–30 km depth) that likely records a deep conduit system for mantle derived melts ascending through the continental ... -
Anatomy of a mega-rock slide at Forkastningsfjellet, Spitsbergen and its implications for landslide hazard and risk considerations
(Peer reviewed; Journal article, 2019)Rock slope failures are a potential source of danger in polar regions. A causal connection between slope failures and climate-related glacial and deglacial processes has been inferred for the growing number of documented ...