150 research outputs found
Hadjimichael-etal_2024_EarthsFuture: Scenario storyline discovery for planning in multi-actor human-natural systems confronting change
No full text<p><strong>Scenario storyline discovery for planning in multi-actor human-natural systems confronting change</strong></p>
<p>Antonia Hadjimichael, Patrick M. Reed, Julianne D. Quinn, Chris R. Vernon, Travis Thurber</p>
<p>corresponding author: [email protected]</p>
<p><strong>Abstract</strong><br>Scenarios have emerged as valuable tools in managing complex human-natural systems, but the traditional approach of limiting focus on a small number of predetermined scenarios can inadvertently miss consequential dynamics, extremes, and diverse stakeholder impacts. Exploratory modeling approaches have been developed to address these issues by exploring a wide range of possible futures and identifying those that yield consequential vulnerabilities. However, vulnerabilities are typically identified based on aggregate robustness measures that do not take full advantage of the richness of the underlying dynamics in the large ensembles of model simulations and can make it hard to identify key dynamics and/or storylines that can guide planning or further analyses. This study introduces the FRamework for Narrative Storylines and Impact Classification (FRNSIC; pronounced ``forensic''): a scenario discovery framework that addresses these challenges by organizing and investigating consequential scenarios using hierarchical classification of diverse outcomes across actors, sectors, and scales, while also aiding in the selection of scenario storylines, based on system dynamics that drive consequential outcomes. We present an application of this framework to the Upper Colorado River Basin, focusing on decadal droughts and their water scarcity implications for the basin’s diverse users and its obligations to downstream states through Lake Powell. We show how FRNSIC can explore alternative sets of impact metrics and drought dynamics and use them to identify drought scenario storylines, that can be used to inform future adaptation planning.</p>
<p><strong>Journal reference</strong><br>Hadjimichael, A., Reed, P.M., Quinn, J.D, Vernon, C.R., Thurber, T., Scenario storyline discovery for planning in multi-actor human-natural systems confronting change. <em>Earth's Future</em> (In Revision)</p>
Supplementary material: An energy-based finite-strain model for 3D heterostructured materials and its validation by curvature analysis
No full text<p>This resource provides the Mathematica notebooks and computed data to reproduce the figures in the paper "<i>An energy-based finite-strain model for 3D heterostructured materials and its validation by curvature analysis"</i> by Y. Hadjimichael, Ch. Merdon, M. Liero, and P. Farrell.</p><p>It consists of two notebooks and accompanying data files. The data files contain curvature values obtained from simulations for bent heterostructured nanowires (consisting of two materials) and bimetallic beams.</p><p>The notebook **nanowire_curvature.nb** demonstrates how to obtain the curvature formulas described in Section 3 of the article. We use an energy-based approach and a kinetic framework to derive the analytic formula for the axial elastic strain on a cross-section, as shown in Figure 6a. It is shown that the two approaches are equivalent if the prestrain of the heterostructure is contained in the material that acts as a stressor. e also plot the curvature for various nanowires with respect to the stressor width. Furthermore, we compare the analytical results with the simulation data in Figure 8a.</p><p>The **bimetal_curvature.nb** file carries out a curvature analysis for the bimetallic beam. In addition, it determines the lattice mismatch required for the beam to bend at specific angles (see Figure 5). We can then compare the theoretical and numerical curvature values as we increase the lattice mismatch of the bimetallic beam. Figure 8b shows the curvature as a function of the lattice mismatch.</p><p>All figures mentioned above can be reproduced directly from the notebooks.</p><p>The notebooks are compatible with Mathematica version 13.2.1.0 and earlier releases.</p><p>This paper presents a comprehensive study of the intrinsic strain response of 3D heterostructures arising from lattice mismatch. Combining materials with different lattice constants induces strain, leading to the bending of these heterostructures. We propose a constitutive model for nonlinear elastic heterostructures such as bimetallic beams or nanowires that takes into account local prestrain within each distinct material region. The resulting system of partial differential equations (PDEs) in Lagrangian coordinates incorporates a nonlinear strain and a linear stress-strain relationship governed by Hooke's law. To validate our model, we apply it to bimetallic beams and hexagonal heteronanowires and perform numerical simulations using finite element methods (FEM). Our simulations examine how these structures undergo bending under varying material compositions and cross-sectional geometries. In order to assess the fidelity of the model and the accuracy of simulations, we compare the calculated curvature with analytically derived formulations. We derive these analytical expressions through an energy-based approach as well as a kinetic framework, adeptly accounting for the lattice constant mismatch present at each compound material of the heterostructures. The outcomes of our study yield valuable insights into the behavior of strained bent heterostructures. This is particularly significant as the strain has the potential to influence the electronic band structure, piezoelectricity, and the dynamics of charge carriers. </p>
Few-body problems
No full textThis volume consists of two review articles. E Hadjimichael's contribution, 'The Nuclear Three-Body Systems', concentrates on recent experimental and theoretical progress achieved in the field. Together with a pedagogical survey of the theoretical framework extensive discussion on the 3N system in the continuum and reactions of electromagnetic probes with 3N systems are provided. 'Four-Nucleon Transfer Reactions' by W Oelert reviews many aspects of a-particle transfer studies. A careful and balanced presentation of both theory and experiment is given. Reasonable agreement between the two is o
Φαίδιμος Ἕκτωρ. Studi in onore di Willy Cingano per il suo 70° compleanno
No full textThe volume collects thirty-six essays honouring Ettore (‘Willy’) Cingano, Professor of Greek Language and Literature at Ca’ Foscari University of Venice. Current and former colleagues, students, and friends have contributed new studies on various aspects of Classical antiquity to celebrate his seventieth birthday. The work consists of seven main sections, mirroring and complementing Willy’s research interests. We start with the subjects to which Willy has contributed the most during his career, early Greek hexameter poetry (chapters 2-6: Calame, Coward, Currie, Meliadò, Sider) and lyric, broadly intended (chapters 7-15: Spelman, Cannatà Fera, Le Meur, Prodi, Tosi, Vecchiato, Hadjimichael, D’Alessio and Prauscello, de Kreij). Next come tragedy (Lomiento, Dorati), Hellenistic and later Greek poetry (Perale, Hunter, Bowie, Franceschini), historiographical and other Greek prose (Andolfi, De Vido, Gostoli, Cohen-Skalli, Kaczko), Latin poetry (Barchiesi, Garani, Mastandrea, Mondin), and finally linguistics and the history of scholarship, ancient and modern (Benuzzi, Cassio, Giangiulio, Guidorizzi, Tribulato). The volume is bookended by a collection of translations from medieval and modern Greek poetry (Carpinato) and a reflection on the dynamic aspect of the sublime (Schiesaro)
Large Volume, Optical and Opto-Mechanical Metrology Techniques for ISIM on JWST
No full textThe final, flight build of the Integrated Science Instrument Module (ISIM) element of the James Webb Space Telescope is the culmination of years of work across many disciplines and partners. This paper covers the large volume, ambient, optical and opto-mechanical metrology techniques used to verify the mechanical integration of the flight instruments in ISIM, including optical pupil alignment. We present an overview of ISIM's integration and test program, which is in progress, with an emphasis on alignment and optical performance verification. This work is performed at NASA Goddard Space Flight Center, in close collaboration with the European Space Agency, the Canadian Space Agency, and the Mid-Infrared Instrument European Consortium
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Future investigations in electromagnetic nuclear physics
No full textSome basic problems in nuclear physics that may receive positive response from electro- and photonuclear research are discussed. Future directions for this research are outlined, and some specific experimental proposals compiled by a study group under the sponsorship of the Bates (MIT) Users Group are described. 1 table
The colorful fields could vitalize our towns: from two-fields model to fourteen-fields model
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