274 research outputs found
Beate Sigriddaughter’s Story of Sigrid
No full textdeath of childNorth VancouverteachingWorld War II1910’sEurop
Discontinuous Galerkin finite element methods for radiative transfer in spherical symmetry
No full textThe discontinuous Galerkin finite element method (DG-FEM) is successfully applied to treat a broad variety of transport problems numerically. In this work, we use the full capacity of the DG-FEM to solve the radiative transfer equation in spherical symmetry. We present a discontinuous Galerkin method to directly solve the spherically symmetric radiative transfer equation as a two-dimensional problem. The transport equation in spherical atmospheres is more complicated than in the plane-parallel case owing to the appearance of an additional derivative with respect to the polar angle. The DG-FEM formalism allows for the exact integration of arbitrarily complex scattering phase functions, independent of the angular mesh resolution. We show that the discontinuous Galerkin method is able to describe accurately the radiative transfer in extended atmospheres and to capture discontinuities or complex scattering behaviour which might be present in the solution of certain radiative transfer tasks and can, therefore, cause severe numerical problems for other radiative transfer solution methods
FastChem 2 : an improved computer program to determine the gas-phase chemical equilibrium composition for arbitrary element distributions
No full textThe computation of complex neutral/ionized chemical equilibrium compositions is invaluable to obtain scientific insights of, for example, the atmospheres of extrasolar planets and cool stars. We present FASTCHEM 2 , a new version of the established semi-analytical thermochemical equilibrium code FASTCHEM. Whereas the original version is limited to atmospheres containing a significant amount of hydrogen, FASTCHEM 2 is also applicable to chemical mixtures dominated by any other species, such as CO2 or N2. The new C++ code and an optional PYTHON module are publicly available under the GPLv3 license. The program is backward compatible so that the previous version can be easily substituted. We updated the thermochemical data base by adding HNC, FeH, TiH, Ca−, and some organic molecules. In total 523 species are now in the thermochemical data base including 28 chemical elements. The user can reduce the total number of species to, for example, increase the computation performance or can add further species if the thermochemical data are available. The program is validated against its previous version and extensively tested over an extended pressure–temperature grid with pressures ranging from 10−13 up to 103bar and temperatures between 100 and 6000K. FASTCHEM 2 is successfully applied to a number of different scenarios including nitrogen-, carbon-, and oxygen-dominated atmospheres and test cases without hydrogen and helium. Averaged over the extended pressure–temperature grid FASTCHEM 2 is up to 50 times faster than the previous version and is also applicable to situations not treatable with version 1
Mixing Methods: Practical Insights from the Humanities in the Digital Age
No full textDigitality is a cause and a consequence of different data cultures. It applies to the 10 research projects that are included in this volume. They are rooted in various humanities disciplines such as art history, philosophy, musicology, religious studies, architectural history, media studies, and literature studies. As diverse as the disciplines are the objects and their formats, which are the subject of this book. The cultural data of the projects include recordings of music and spoken word, photographs and other types of images, handwriting, typoscripts and maps. The oldest material dates back to 500 BCE, followed by medieval times, the 18th and 19th centuries, early 20th century and the present. All projects share that they study their material with digital methods, although digitality comes into play at different moments and layers in each of the projects. Hardly readable manuscripts from the 18th century have to be treated with specialized OCR-methods while Plato’s texts are already available in digital form, and therefore open up other affordances for analysis. Special analysis possibilities had to be developed for certain image sources. For all projects, however, it is equally true that only the digitization of the objects makes them accessible to the methods that are the subject of this book.History, Form & Aesthetic
FastChem: A computer program for efficient complex chemical equilibrium calculations in the neutral/ionized gas phase with applications to stellar and planetary atmospheres
No full textFor the calculation of complex neutral/ionized gas-phase chemical equilibria, we present a semi-analytical, versatile, and efficient computer program, called FastChem. The applied method is based on the solution of a system of coupled non-linear (and linear) algebraic equations, namely the law of mass action and the element conservation equations including charge balance, in many variables. Specifically, the system of equations is decomposed into a set of coupled nonlinear equations in one variable each, which are solved analytically whenever feasible to reduce computation time. Notably, the electron density is determined by using the method of Nelder and Mead at low temperatures. The program is written in object-oriented C++ which makes it easy to couple the code with other programs, although a stand-alone version is provided. FastChem can be used in parallel or sequentially and is available under the GNU General Public License version 3 at https://github.com/exoclime/FastChem together with several sample applications. The code has been successfully validated against previous studies and its convergence behaviour has been tested even for extreme physical parameter ranges down to 100K100K and up to 1000bar1000bar. FastChem converges stable and robust in even most demanding chemical situations, which posed sometimes extreme challenges for previous algorithms
Investigation of family (un)truths: memory, trauma and testimony in the study "My good father: life with his past" by Beate Niman
No full textOsnovna namera rada jeste analitičko raslojavanje sadržine studije "Moj dobri otac: život sa njegovom prošlošću" Beate Niman. Autorka studije je kćerka Bruna Zatlera, šefa Gestapoa i zločinca Drugog svetskog rata, koji je, pored mnogobrojnih zverstava, rukovodio operacijom ubijanja žena i dece u dušegupkama u Beogradu (1942-1944). Uočavajući praznine i nelogičnosti u svojim sećanjima, autorka započinje proces istraživanja o ocu u nameri da napiše njegovu biografiju. Beatin narativ sučelјava prošlost sa sadašnjošću, kao i porodičnu kreiranu prošlost sa potencijalnim porodičnim nasleđem. Osim toga, baveći se istorijom, činjenicama, dokazima, otac postaje predmet svojevrsne kćerkine istrage. Počevši od dekonstrukcije (Beatinih) sećanja, najpre je istaknuta prošlost Bruna Zatlera. Biće dati uvidi u autorkine procese istraživanja kojima se dospelo do razotkrivanja istorijske i porodične istine o Zatleru. Istraživanje neće biti striktno fiksirano na lik Bruna Zatlera, budući da narativ kao takav daje prostor istraživanju psiholoških aspekata ličnosti same Beate Niman. Na račun rečenog, ali i u vezi sa samim narativom, biće tematizovani odnosi istorije i prošlosti, funkcije sećanja, dometi trauma, aspekti (auto)biografije, kao uvidi u postojanje dvostrukog svedočenja i dvostrukog istražnog postupka na nivou narativa kao celine.The main purpose of the work is the analytical stratification of the content of the study "My good father: life with his past" by Beate Nieman. The author of the study is the daughter of Bruno Sattler, head of the Gestapo and a criminal of the Second World War, who, in addition to numerous atrocities, led the operation of killing women and children in the dušegupka’s in Belgrade (1942-1944). Noticing gaps and illogicalities in her memories, the author begins the process of researching her father with the intention of writing his biography. Beata’s narrative confronts the past with the present, as well as the family’s created past with the potential family legacy. In addition, dealing with history, facts, evidence, the father becomes the subject of his daughter’s investigation. Starting with the econstruction of (Beat’s) memories, Bruno Sattler’s past is highlighted first. Insights will be given into the author’s research processes that led to the uncovering of the historical and family truth about Sattler. The research will not be strictly fixed on the character of Bruno Sattler since the narrative as such gives space to research the psychological aspects of the personality of Beate Niemann herself. The work will be focused on the relations of history and the past, the functions of memory, the scope of trauma, aspects of (auto)biography, as insights into the existence of double testimony and double investigative procedure at the level of the narrative.Tema broja: "Holokaust: nove perspektive, nova saznanja, novi izazovi" (topic of the issue: "Holocaust: new perspectives, new knowledge, new challenges")
The Fabric of Gifts: Culture and Politics of Giving and Exchange in Archaic Greece
No full textWhen the Greek leader Agamemnon took for himself the woman awarded to Achilles as his spoils of battle, the warrior’s resulting anger and outrage nearly cost his side the war. Beyond the woman herself was what she symbolised — a matter of esteem rather than material value. In Archaic Greece the practices of gift giving existed alongside an economy of market relations. The value of gifts and the meanings of exchange in ancient societies are fundamental to the debates of 19th-century economists, to Marcel Mauss’s famous Essai sur le don (1923-4), and to the definition of experiential value by modern philosopher Yanis Varoufakis.
In this book Beate Wagner-Hasel analyses the sensory content and the social context of many examples of Greeks bearing gifts: to guests, at sacrificial rituals and at funerals, to brides and to heroes. The fabric of these gifts unfolds a panorama of social networks and models of rulership embedded in a world of pastoral and textile economy. Among the gifted objects that represent this world, textiles offer the clearest representation of social cohesion — the key value ascribed to the gift by the earliest theorists of gift-giving.
Beate Wagner-Hasel was Professor of Ancient History at the Leibniz University of Hannover 2001–2018, specializing in economic history and gender studies. She is the author of Antike Welten (2017), Alter in der Antike (2012), Die Arbeit des Gelehrten (2011), and Der Stoff der Gaben (2000), and co-editor (with Marie-Louise Nosch) of Gaben, Waren und Tribute (2019).
The Fabrics of Gifts is a revised edition of her study of gifts in Early Greece (Der Stoff der Gaben, 2000).https://digitalcommons.unl.edu/zeabook/1092/thumbnail.jp
Georg Rheticus as author and editor of the sphere of Sacrobosco
No full textThese 3 datasets are based on the corpus of books built within the project "The Sphere" (https://sphaera.mpiwg-berlin.mpg.de/).
The first 2 datasets are edges of a network of early modern creators of text-parts whose works were published together during their life time.
The last dataset is a list of text-parts authored or edited by Georg Rheticus.
Prepared for the publication of "The Hidden Praeceptor: How Georg Rheticus Taught Geocentric Cosmology to Europe" by Matteo Valleriani, Olya Nicolaeva and Beate Federau in Perspectives on Science
Georg Rheticus as author and editor of the sphere of Sacrobosco
No full textThese 3 datasets are based on the corpus of books built within the project "The Sphere" (https://sphaera.mpiwg-berlin.mpg.de/).
The first 2 datasets are edges of a network of early modern creators of text-parts whose works were published together during their life time.
The last dataset is a list of text-parts presumably authored or edited by Georg Rheticus.
Prepared for the publication of "The Hidden Praeceptor: How Georg Rheticus Taught Geocentric Cosmology to Europe" by Matteo Valleriani, Olya Nicolaeva and Beate Federau in Perspectives on Science
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