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  • 1
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    Handbook of Computational Economics, Volume 1 (1996)
    Amsterdam : Elsevier
    Details
    Pages: Online-Ressource (3-827)
    ISBN: 9780444898579
    URL: http://www.sciencedirect.com/science/book/9780444898579
    Language: English
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    E-BOOK
  • 2
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    Improving the Cybersecurity of U.S. Air Force Military Systems Throughout Their Life Cycles (2023)
    RAND Corporation
    Details
    Publication Date: 2024-04-14
    Description: There is increasing concern that Air Force systems containing information technology are vulnerable to intelligence exploitation and offensive attack through cyberspace. In this report, the authors analyze how the Air Force acquisition/life-cycle management community can improve cybersecurity throughout the life cycle of its military systems.
    Keywords: History ; Technology ; thema EDItEUR::U Computing and Information Technology::UT Computer networking and communications::UTN Network security ; thema EDItEUR::U Computing and Information Technology::UD Digital Lifestyle and online world: consumer and user guides ; thema EDItEUR::J Society and Social Sciences::JW Warfare and defence::JWC Military forces and sectors::JWCM Air forces and warfare ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TT Other technologies and applied sciences::TTM Military engineering
    Language: English
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  • 3
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    The Novel-Machine (2022)
    Johns Hopkins University Press
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    Publication Date: 2024-03-26
    Description: Originally published in 1980. The first section of The Novel-Machine consists of five short chapters that rewrite Autobiography as an undisguised theory of realistic fiction, exploring its paradoxes while placing it in the context of mid-Victorian criticism. Chapters 6 and 7 survey the manifestations in Trollope's novels of what his theory sets down as the primary difference of realism: its way of telling its readers how to read. Chapter 8 is a close reading of He Knew He Was Right, a neglected novel that, in Kendrick's estimation, deserves to stand in much higher critical esteem than it does. Kendrick shows how deeply woven into the texture of Trollope's writing the rhetoric of realism is. Kendrick's reading is a departure from the usual method of criticizing Trollope—surveying the whole of his work a novel at a time, saying a little about every novel and always too little about each.
    Keywords: Literature: history & criticism ; thema EDItEUR::D Biography, Literature and Literary studies::D Biography, Literature and Literary studies::DS Literature: history and criticism
    Language: English
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  • 4
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    Brittle-Ductile Deformation and Tensile Rupture of Dome Lava During Inflation at Santiaguito, Guatemala (2021)
    Details
    Publication Date: 2021-10-14
    Description: Gas-and-ash explosions at the Santiaguito dome complex, Guatemala, commonly occur through arcuate fractures, following a 5- to 6-min period of inflation observed in long-period seismic signals. Observation of active faults across the dome suggests a strong shear component, but as fault propagation generally proceeds through the coalescence of tensile fractures, we surmise that explosive eruptions require tensile rupture. Here, we assess the effects of temperature and strain rate on fracture propagation and the tensile strength of Santiaguito dome lavas. Indirect tensile tests were conducted on samples with a porosity range of 3–30% and over diametral displacement rates of 0.04, 0.004, and 0.0004 mm/s. At room temperature, the tensile strength of dome rock is rate independent (within the range tested) and inversely proportional to the porosity of the material. At eruptive temperatures we observe an increasingly ductile response at either higher temperature or lower displacement rate, where ductile deformation is manifest by a reduction in loading rate during constant deformation rate tests, resulting in slow tearing, viscous flow, and pervasive damage. We propose a method to conduct indirect tensile tests under volcanic conditions using a modification of the Brazilian disc testing protocol and use brittleness indices to classify deformation modes across the brittle-ductile transition. We show that a degree of ductile damage is inevitable in the lava core during explosions at the Santiaguito dome complex and discuss how strain leading to rupture controls fracture geometry, which would impact gas pressure release or buildup and regulate explosive activity.
    Keywords: 551.21 ; 551.8 ; tensile strength ; Santiaguito ; Brittleness Index ; brittle-ductile ; indirect tensile tests ; Brazilian disc tests
    Language: English
    Type: map
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    CITATION GEO-LEO
  • 5
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    Transforming knowledge systems for life on Earth: Visions of future systems and how to get there (2020)
    In:  Energy Research and Social Science
    Details
    Publication Date: 2024-02-22
    Description: Formalised knowledge systems, including universities and research institutes, are important for contemporary societies. They are, however, also arguably failing humanity when their impact is measured against the level of progress being made in stimulating the societal changes needed to address challenges like climate change. In this research we used a novel futures-oriented and participatory approach that asked what future envisioned knowledge systems might need to look like and how we might get there. Findings suggest that envisioned future systems will need to be much more collaborative, open, diverse, egalitarian, and able to work with values and systemic issues. They will also need to go beyond producing knowledge about our world to generating wisdom about how to act within it. To get to envisioned systems we will need to rapidly scale methodological innovations, connect innovators, and creatively accelerate learning about working with intractable challenges. We will also need to create new funding schemes, a global knowledge commons, and challenge deeply held assumptions. To genuinely be a creative force in supporting longevity of human and non-human life on our planet, the shift in knowledge systems will probably need to be at the scale of the enlightenment and speed of the scientific and technological revolution accompanying the second World War. This will require bold and strategic action from governments, scientists, civic society and sustained transformational intent.
    Language: English
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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    CITATION RIFS
  • 6
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    The Chilean GNSS Network: Current Status and Progress toward Early Warning Applications (2018)
    In:  Seismological Research Letters
    Details
    Publication Date: 2020-02-12
    Language: English
    Type: info:eu-repo/semantics/article
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  • 7
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    Reprocessing of geodetic GNSS recordings in Antarctica for geodetic and geodynamic applications (GIANT-REGAIN) (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-06-20
    Description: Changing ice masses cause deformation of the solid Earth on different time scales. The classic view discriminates between elastic deformation and glacial-isostatic adjustment (GIA) due to present-day and past changes, respectively. The increasing availability of observational data and modelling advances allows our understanding of the complex pattern of solid Earth response to improve, including observation of rapid GIA.Geodetic GNSS provides a technique to directly observe bedrock motion. In Antarctica, several studies already utilized such GNSS data but were limited in time or to a specific region, or could use recordings of only a limited number of stations. Within the SCAR-endorsed project GIANT-REGAIN a reprocessing of all available Antarctic GNSS data was realized, comprising data acquired by episodic and permanent recordings at about 280 bedrock sites between 1995 and 2021. Special attention was given to metadata which are indispensable for a correct assignment of the hardware set-up. The four processing centres applied precise point positioning or differential GNSS using different scientific software. Time series of consistent point coordinates were generated as the major product.We will report on the comparison of the different solutions which allows to quantify time series analysis uncertainty. From the time series, coordinate velocities will be estimated. Here, we will discuss different aspects such as useful noise models, spatial correlations and suitable trajectory models. The treatment of the solid Earth response to ice-mass changes occurring over the last decades up to present day is currently under strong discussion and will be touched briefly.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 8
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    Fault slip in multiphase magmas (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-07
    Description: During volcanic eruptions, changes in explosivity may be attributed to the rheological response of the magma. The tendency for magmatic suspensions to localise strain ensures that magmas can shift from a regime controlled by viscous flow to that where they can fracture and fragment, owing to increasing viscosity of the degassing, crystallising magma and the elastic response of the melt when subjected to stress variations shorter than the structural relaxation timescale. If the conditions for magma failure are met over a protracted temporal or spatial scale, a shear zone may flank the ascending magma.Slip and traction along such marginal shear zones has been posited as the cause of geophysical signals observed at differing timescales during volcanic eruptions, yet the complexities of such structural features are still poorly understood. Melt viscosity, crystal cargo, vesicularity and ascent rate all impact the type and scale of shear textures developed, and as temperature, strain-rate and the presence of fluids fluctuate, fault products may repeatedly form and deconstruct in unison or in subsequent events. Here, we review some recent advances shaping our understanding of magma failure and the post-development influence of faulted magmas on ascent. We focus on magmatic pseudotachylytes formed by frictional melting, which can alter the physical and chemical properties of the magma: driving mineral reactions; melting crystalline phases; triggering devolatilisation and vesiculation; inducing fragmentation; lowering interstitial melt viscosity; altering magnetic properties; efficiently healing fractures and redistributing permeable pathways. Such processes may be vital to understand shallow controls on eruptive behaviour.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 9
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    Sintering of crystal-bearing, vesiculating and diffusively outgassing pyroclasts (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-12
    Description: At silicic volcanoes, the eruptive style is strongly influenced by the evolution of the magma’s permeable, outgassing pathways (e.g. fractures, connected pores). Studies have revealed that ascending magmas can undergo multiple cycles of fragmentation (or fracture) and healing (or sintering) due to stress fluctuations imparted by shear, vesiculation, gas flow, etc. Fragmentation and healing cycles result in transient permeability; fracturing rapidly increases permeability, whilst sintering progressively shuts permeable pathways. Tuffisite veins are a fossil record of this process and further evidence that sintering may be accompanied by vesiculation and diffusive outgassing of pyroclasts. A recent study showed that in contrast to sintering, which causes progressive densification as particles agglutinate, the occurrence of vesiculation and diffusive outgassing causes hysteretic volume and rheological changes that momentarily inhibit sintering, prompting fluctuations in porosity and permeability. Thus, pyroclast sintering models must be expanded and experimentally verified to represent the full spectrum of pyroclastic deposits, considering the impacts of volatile saturation, crystallinity, spatial limits (volume containment), stress and pressure. Here, we investigate the evolution of the permeable network during sintering of vesiculating and diffusively outgassing melt fragments of different grain sizes, mixed with variable amounts of crystals to examine the efficacy of sintering in these complex systems. We perform isothermal sintering experiments in variably confined spaces and stresses, and we quantify the evolution of the permeable porous network over a series of time scales. We examine how these constraints need to be included in future models aiming to resolve the evolution of fragmental magmatic systems.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 10
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    Permeability anisotropy development in sintering pyroclasts under differential stress (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-05
    Description: In magmas, the sintering of pyroclasts controls the geometry of permeable pathways, which can in turn influence the cyclicity of pressure build-up and release. The kinetics and timescales of sintering, along with its impact on permeability, have been well studied at both iso- and non-isothermal conditions and show that surface tension is the main process driver, leading to a reduction in both porosity and permeability. On the other hand, fewer studies have looked at the effect of differential load on the sintering process and the resultant micro-structural arrangements. Here, we investigate whether uniaxial loading can enhance pore connectivity perpendicular to the applied principal load. We put a suite of sintered glass bead samples (pre-sintered to 20-30% porosity) of 25 mm height and 25 mm diameter under different uniaxial loads (every 10N between 30-100N) and at the same sintering temperature (660〈sup〉o〈/sup〉C furnace temperature). We then reconstruct the geometry of the porous network using X-ray computed tomography scans of the deformed samples before modelling the fluid flow and permeabilities in directions parallel and perpendicular to the applied stress. Thus, revealing how permeability anisotropy may develop under differential stress conditions.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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