97,314 research outputs found
Joshua Davis: Author of Spare Parts
Full text linkCitation: K-State First (2016). Joshua Davis: Author of Spare Parts [Flier]. Manhattan, Kansas: K-State First.Flyer advertising Joshua Davis's author talk at Kansas State University
Steven Johnson Author Talk Poster
No full textK-State Book NetworkA poster advertising an author talk by Steven Johnson at Kansas State University on September 3, 2014. Steven Johnson's book "The Ghost Map" was the 2014-2015 common book
Mapping hydrogen storage capacities of UK offshore hydrocarbon fields and exploring potential synergies with offshore wind
Full text linkEnergy storage is an essential component of the transitioning UK energy system, a crucial mechanism for stabilizing intermittent renewable electricity supply and meeting seasonal variation in demand. Low-carbon hydrogen provides a balancing mechanism for variable renewable energy supply and demand, and a method for decarbonizing domestic heating, essential for meeting the UK's 2050 net-zero targets. Geological hydrogen storage in porous rocks offers large-scale energy storage over a variety of timescales and has promising prospects due to the widespread availability of UK offshore hydrocarbon fields, with established reservoirs and existing infrastructure. This contribution explores the potential for storage within fields in the UK Continental Shelf. Through comparison of available energy storage capacity and current domestic gas demands, we quantify the hydrogen required to decarbonize the UK gas network. We estimate a total hydrogen storage capacity of 3454 TWh, significantly exceeding the 120 TWh seasonal domestic demand. Multi-criteria decision analysis, in consultation with an expert focus group, identified optimal fields for coupling with offshore wind, which could facilitate large-scale renewable hydrogen production and storage. These results will be used as inputs for future energy system modelling, optimizing potential synergies between offshore oil and gas and renewables sectors, in the context of the energy transition
Experimental and numerical investigations of geomechanical controls on petrophysical changes of carbonates during fluid flow
Full text linkIn flooding experiments, porosity and permeability of carbonate rocks is enhanced
through the dissolution of the rock matrix, which further increase the
permeability as well as the inter-connection of the pre-existing porosity. Authors
often refer to this process as wormholing or channelling, which define preferential
pathways for any fluid circulating through the rock’s matrix (Hoefner and Fogler,
1988; Fredd and Fogler, 1998; Golfier et al., 2002). A wormhole’s shape and size
ranges from face dissolution at very low fluid flow rates (where the reactive fluid
is rapidly consumed after the injection point), to uniform dissolution (where the
acid is brought to far-ends within the rock matrix, which allows the creation of a
large network of connected pores). Authors have studied the factors influencing
the relationship between dissolution fronts, injection rate, rock nature, and
acidity of the circulating fluid (Frick et al., 1994a; Bazin et al., 1995; Fredd et al.,
1996; Fredd and Fogler, 1998; Golfier et al., 2002; Egermann et al., 2006; Luquot
and Gouze, 2009; Menke et al., 2015; Ott and Oedai, 2015; Barri et al., 2016;
Luquot et al., 2016; Teles et al., 2016; Zhang et al., 2016). The current status of
knowledge present strong connections between the reaction rate and the diffusion
rate (referred to as the Damköhler number – Da Bekri et al. (1995); Egermann
et al. (2010)), as well as the study between the fluid velocity and the ability
for a medium to diffuse into a solvent (referred to as the Péclet number – Pe
Golfier et al. (2002); Menke et al. (2015)). The Da number measures the relative
importance of the reaction rate constant versus advection over some length
scale, while the Pe number gives the ratio of advective to dispersive flux for a
given length scale (Zhang and Kang, 2004; Steefel and Lasaga, 1990). Large Da
correspond to rapid chemical reaction in comparison to all other processes. On
the other hand, smaller Da testify of very slow chemical reactions in comparison
to all other processes taking place during fluid flow (Zhang and Kang, 2004). A
low Péclet number suggests that transport is governed by diffusion and not by
convection, and inversely at high Pe number (De Boever et al., 2012).
Along with these dynamically controlled numbers, studies have tried to unpick
the relationship between rock-fluid interaction for a variety of injection fluid,
as well as rock-stress interaction. These studies have been done through the
analysis of key variables (resistivity, porosity, permeability, etc.), using acidic
and non-acidic fluids (Hoefner and Fogler, 1988; Frick et al., 1994b; Bazin
et al., 1995; Fredd et al., 1996; Fredd and Fogler, 1998; Golfier et al., 2002;
Egermann et al., 2006; Luquot and Gouze, 2009; Menke et al., 2015; Ott and
Oedai, 2015; Barri et al., 2016; Luquot et al., 2016; Teles et al., 2016; Zhang
et al., 2016). The experimental rationales of these studies usually implies
large changes in the variables representing the reservoirs conditions, such as
the temperature, confining pressure, and the effective stress. A large gap has
been found between the actual state of knowledge and the absolute impact
of effective stress on reservoir rock alteration, at steady reservoir condition
of pressure and temperature. In this study, we have created an experimental
matrix where the variable representing the reservoir conditions are kept constant
during an experimental flooding, while varied between experiments. By doing
so, we can isolate and cross-compare the effect of each variable on the rock
alteration. We have flooded a total of twelve 38 mm large diameter carbonate
cores of different nature (Indiana limestones, Saturnia travertines, and pre-salt
shrubs) under constant geo-reservoir condition of P-T: Pc = 50 MPa, and T= 60
◦C. The effective stress and pore volume rate was varied between experiments
while kept constant during each experimental flooding. We used porosity,
permeability, Ca-Mg analysis, and μCT scanning as proxies for stress state
related rock matrix alteration. While it is agreed that injection rate plays a major
role in carbonate dissolution, through a higher dissolution rate corresponding
to a high injection rate, and our work confirms this, we also demonstrate
that for a constant given confining pressure, the effective stress can have a
stimulant role in rock matrix alteration and wormhole development (Indiana
limestone). Inversely, effective stress has a reverse role in less consolidated,
more heterogeneous rocks (travertines). The pre-salt rock samples have shown
interesting and mixed results, whose behaviour falls in between the Indiana
limestone’s ones and the travertines’ ones: the chemical response behaved like
an Indiana limestone while the physical response can be compared to a travertine.
We think that our results highlight the importance of the stress state in a reservoir,
and while the confining pressure cannot be varied during injection or depletion
of a reservoir, the pore pressure can be affected. The processes involved behind
this are not yet clarified by the experimental work, but we believe that they
are time and chemistry related, with further study by the authors indicating
that our results are energy-dependent. Therefore, in a carbonate sample, the
expected wormhole shape and spread can be predicted thanks to the reservoir
conditions, the experimental conditions, and the rock’s petromorphology. Finally,
our numerical work further demonstrates that the heterogeneities within the
porosity arrangement and geometry drive the fluid flow and could represent the
main driving variable for the creation of pore space and carbonate dissolution
Sampling and preparation of c.200 mm diameter cylindrical rock samples for geomechanical experiments
Full text linkExperimental investigation of rock mechanical properties of real and artificial samples often requires much care and attention to detail during sample preparation. This especially applies to high fidelity state of the art complex experimental apparatuses where sample tolerance is low due to the complexity of the measuring and stress control devices as well as the nature of the experiments to be conducted. Although sometimes mundane, the sample preparation methodology is as equally important as the experimental apparatus itself, and can require several new technological developments. The methodology and technical developments required to prepare realistic heterogeneous, fractured and natural reservoir analogue rock samples for coupled thermo-hydro-mechanical-chemical process experimental investigation is described here. We present the sample recovery and preparation procedures for large (c.200 mm diameter), cylindrical samples of 200 mm ± 5 mm length, with variable composition and mechanical properties e.g. rock strength, existing fractures/fracture networks, macro-porosity, or lithic fragments. Although the technology demonstrated is for a specific application, the procedures developed, equipment and methodology are applicable to multiple sizes of sample requirements
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Estimating geological CO2 storage security to deliver on climate mitigation
Full text linkACKNOWLEDGEMENTS Juan Alcalde and Clare Bond were supported by NERC Grant NE/M007251/1 on interpretational uncertainty; Stephanie Flude and Stuart M V Gilfillan were supported by EPSRC Grant EP/K036033/1; R Stuart Haszeldine was supported by Scottish Funding Council, EPSRC Grants EP/P026214/1, EP/K000446/2 and NERC Grant NE/L008475/1; Gareth Johnson was supported by EPSRC Grant EP/P026214/1; Vivian Scott was supported by NERC GHGR programme Grant NE/P019749/1; Katriona Edlmann was supported by H2020 Grant 636811.Peer reviewe
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Expanding “Communities and Collections” in the K-State Research Exchange (K-REx) to benefit the K-State Community and Beyond
No full textKansas State University has used its institutional repository, the K-State Research Exchange (K-REx), to store and share its first year experience program, K-State First, and notably its common reading program, K-State First Book. We have done so with the aim that the accessibility and preservation of these documents ensures program stability, promotes engagement with first year programming, and provides the ability to foster growth,educational opportunities, and community building outside of K-State. Moving away from research concentrated repositories and taking a more holistic approach to scholarship, especially when realizing the pedagogical significance of collaborative campus programming, institutions can showcase, discover, preserve, and grow programs that shape campus communities and engagement.
This session will provide an overview of K-REx and spotlight the digital archive of the university’s first year experience program and common reading program, K-State First Book. We will discuss the benefits and challenges to expanding the purview of your repositories. We talkthrough the types of materials we decide to host in our repository and why we share what we do. We will also provide recommendations on new ways to evaluate what belongs in institutional repositories and how this diversity can benefit your program, your institution, the community, and others
Ready Player One Program Event Poster
No full textK-State Book NetworkA poster advertising an author talk by Ernest Cline at Kansas State University on October 10, 2013. Ernest Cline's book "Ready Player One" was selected as the 2013-2014 common book
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