John Howell

ORCID: 0000-0003-3818-8048
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About
Contact & Profiles
Research Areas
  • Geological formations and processes
  • Hydrocarbon exploration and reservoir analysis
  • Geology and Paleoclimatology Research
  • Fault Detection and Control Systems
  • Geological Modeling and Analysis
  • Membrane Separation Technologies
  • Reservoir Engineering and Simulation Methods
  • Geological Studies and Exploration
  • Hydraulic Fracturing and Reservoir Analysis
  • Geological and Geophysical Studies
  • 3D Surveying and Cultural Heritage
  • Hydrology and Sediment Transport Processes
  • Advanced Control Systems Optimization
  • Membrane-based Ion Separation Techniques
  • Methane Hydrates and Related Phenomena
  • Control Systems and Identification
  • Seismic Imaging and Inversion Techniques
  • Remote Sensing and LiDAR Applications
  • Risk and Safety Analysis
  • Nuclear and radioactivity studies
  • Geochemistry and Geologic Mapping
  • Protein purification and stability
  • Advanced Data Processing Techniques
  • Wastewater Treatment and Nitrogen Removal
  • Aeolian processes and effects

University of Aberdeen
2016-2025

Massanutten Regional Library
2024

Government of Western Australia Department of Health
2023

King's College Hospital
2014-2022

Joint Institute for High Temperatures
2008-2022

NORCE Norwegian Research Centre
2021

Energy Transitions (United Kingdom)
2016-2020

University of Bath
1996-2019

Uni Research (Norway)
2010-2017

University of Rochester
2017

10.1016/0376-7388(94)00265-z article EN Journal of Membrane Science 1995-04-01

Light Detection and Ranging (LiDAR) Structure from Motion (SfM) provide large amounts of digital data which virtual outcrops can be created. The accuracy these surface reconstructions is critical for quantitative structural analysis. Assessment LiDAR SfM methodologies suggest that results are comparable to high data-density on individual surfaces. effect chosen acquisition technique the full outcrop efficacy its form analysis prediction beyond single bedding surfaces, however, less certain....

10.1016/j.jsg.2017.04.004 article EN cc-by Journal of Structural Geology 2017-04-20

Abstract The Neuquén Basin of Argentina and central Chile contains a near-continuous Late Triassic-Early Cenozoic succession deposited on the eastern side evolving Andean mountain chain. It is polyphase basin characterized by three main stages evolution: initial rift stage; subduction-related thermal sag; foreland stage. fill records tectonic evolution Andes with dramatic evidence for base-level changes that occurred both within along its margins. record these mixed siliclastic-carbonate...

10.1144/gsl.sp.2005.252.01.01 article EN Geological Society London Special Publications 2005-01-01

10.1016/0376-7388(95)00114-r article EN Journal of Membrane Science 1995-11-01

Abstract The uptake of phenol by pure cultures Pseudomonas putida growing on in continuous culture has been studied. purpose the experiments was to determine kinetic parameters governing organisms high‐conversion range measuring rates per unit biomass time at various concentrations. microorganisms used were taken from a chemostat residence times 8, 5.25, 3.85, 3.2, 3, and 2.7h. Monod–Haldane model modifications it applied data best determined nonlinear least‐squares techniques....

10.1002/bit.260230909 article EN Biotechnology and Bioengineering 1981-09-01

Advances in data capture and computer technology have made possible the collection of three-dimensional, high-resolution, digital geological from outcrop analogs. This paper presents new methodologies for acquisition utilization three-dimensional information generated by ground-based laser scanning (lidar) outcrops. A complete workflow is documented—from selection through collection, processing building virtual outcrops—to interpretation geocellular models using an industry-standard,...

10.1130/ges00099.1 article EN Geosphere 2007-01-01

Abstract A product inhibition model is developed to describe the hydrolysis of cellulose by Trichoderma viride enzyme system. It assumed that noncompetitive cellobiose dominates reaction kinetics. Experiments show this indeed a reasonable assumption for initial concentrations up 15 g/liter and at extents 65′. Kinetic parameters were determined inhibitionmodel in batch experiments with durations 1.5 hr. These parameterswere then used predicting progress 10 Cellobiose was added mixture onset...

10.1002/bit.260170608 article EN Biotechnology and Bioengineering 1975-06-01

Abstract A mixed culture derived from soil and activated sludge organisms was used to degrade phenol which inhibitory microorganisms at higher concentrations. The purpose of the experiments determine kinetic parameters governing growth by measuring rates in batch culture. To maintain a constant inoculum for taken continuously operating continuous Two populations were studied corresponding two separate residence times apparatus. One contained predominantly filamentous organisms, other...

10.1002/bit.260150506 article EN Biotechnology and Bioengineering 1973-09-01

Abstract Analogues, especially outcrop analogues, have played a central role in improving understanding of subsurface reservoir architectures. Analogues provide important information on geobody size, geometry and potential connectivity. The historical application analogues for distributions reservoirs is reviewed, from the pioneering work 1960s to high-tech virtual methodologies today. Four key types analogue data are identified: hard data, which describe dimensions geobody; soft conceptual...

10.1144/sp387.12 article EN Geological Society London Special Publications 2014-01-01

The use of three-dimensional (3-D), photo-textured representations topography from laser scanning and photogrammetry is becoming increasingly common across the geosciences. This rapid adoption driven by recent innovations in acquisition hardware, software automation, sensor platforms, including unmanned aerial vehicles. In addition, fusion surface geometry with imaging sensors, such as multispectral, hyperspectral, thermal, ground-based radar, geophysical methods creates complex visual data...

10.1130/ges02002.1 article EN cc-by-nc Geosphere 2019-01-10

Igneous sills are common components in rifted sedimentary basins globally. Much work has focused on intrusions emplaced at relatively shallow palaeodepths (0 – 1.5 km). However, owing to constraints of seismic reflection imaging and limited field exposures, deeper (>1.5 km) within not as well understood regard their emplacement mechanisms host-rock interactions. Results from a world-class, seismic-scale outcrop intruded Jurassic rocks East Greenland presented here. host have been studied...

10.1144/jgs2016-018 article EN cc-by Journal of the Geological Society 2016-07-22

10.1016/0376-7388(94)00241-p article EN Journal of Membrane Science 1995-06-01

Abstract Hydrolysis of cellulose by Trichoderma viride cellulase reached a plateau after some 25 hr. If the initial enzyme‐to‐substrate ratio was low, resuspension substrate in fresh enzyme or addition resulted further high rate hydrolysis. This did not occur if high. Over 75% hydrolysis might be achieved former case, while less than 60% latter. A model postulating inactivation adsorbed enzyme–substrate complex which blocked proposed, and it found to fit data well. The proposed had five...

10.1002/bit.260200607 article EN Biotechnology and Bioengineering 1978-06-01

The key causes of heterogeneity within progradational shallow-marine reservoirs have been defined as: shoreline type (wave vs. fluvial dominated); trajectory; the presence permeability contrasts associated with dipping clinoform surfaces shoreface or delta front; cemented barriers between parasequences; and progradation direction (described respect to main waterflood in simulated reservoir). These parameters were recorded from a series 56 modern ancient depositional systems variety climatic...

10.1144/1354-079307-787 article EN Petroleum Geoscience 2008-02-01

Estimates of recovery from oil fields are often found to be significantly in error, and the multidisciplinary SAIGUP modelling project has focused on problem by assessing influence geological factors production a large suite synthetic shallow-marine reservoir models. Over 400 progradational reservoirs, ranging comparatively simple, parallel, wave-dominated shorelines through laterally heterogeneous, lobate, river-dominated systems with abundant low-angle clinoforms, were generated as...

10.1144/1354-079307-790 article EN Petroleum Geoscience 2008-02-01

Abstract This paper discusses the application of laser scanning and photo‐realistic modelling to aid study geological outcrops, using two examples from central eastern Utah, USA, which are analogues subsurface hydrocarbon fields. Terrestrial point clouds were triangulated obtain high‐resolution surface representations, combined with semi‐metric imagery give texture‐mapped models outcrops. Such provide basis for interpretation used reconstruct geometries layers over extent area. The digitised...

10.1111/j.1477-9730.2010.00585.x article EN The Photogrammetric Record 2010-09-01

Application of 3D seismic reflection data to igneous systems in sedimentary basins has led a revolution the understanding mafic sill complexes. However, there is considerable uncertainty on how geometries and architecture complexes within subsurface actually relates data. To provide constraints should be interpreted, we present synthetic seismograms generated from seismic-scale (22 × 0.25 km) outcrop East Greenland constrained by abundant field This study highlights overlying rocks adversely...

10.1144/jgs2017-096 article EN Journal of the Geological Society 2017-12-01

Research Article| August 01, 2015 Recognition and importance of amalgamated sandy meander belts in the continental rock record Adrian J. Hartley; Hartley 1Department Geology Petroleum Geology, University Aberdeen, Aberdeen AB24 3UE, UK Search for other works by this author on: GSW Google Scholar Amanda Owen; Owen Alistair Swan; Swan Gary S. Weissmann; Weissmann 2University New Mexico, Department Earth Planetary Sciences, MSC03 2040, Albuquerque, Mexico 87131-0001, USA Barbara I. Holzweber;...

10.1130/g36743.1 article EN Geology 2015-06-23
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