53 research outputs found
Nella biblioteca di Hartmann Schedel: l'index librorum aldino del 1498 e le Decades rerum Venetarum di Marcantonio Sabellico
No full textThe contribution examines the first catalogue issued by Aldo Manuzio on 1 October 1498 and in particular the copy in the Österreichische Nationalbibliothek in Vienna (Ink. 7.A.13). A careful examination of the manuscript annotations, known to be by Hartmann Schedel, has enabled the author to identify the volume in which Schedel had the catalogue bound in his lifetime: a copy of Marcantonio Sabellico’s Decades rerum Venetarum (Venice, Andrea Torresani, 1487) also in the Österreichische Nationalbibliothek (Ink. 7.A.7). A detailed description of the item and Schedel's textual and graphic additions reveals for the first time what was one of the most significant books in the humanist's library and allow us to reconstruct the overall context of its use in the years immediately following its publication
Optical coherence tomography in archaeological and conservation science - a new emerging field
No full textThere has been a long tradition of applying biomedical imaging techniques to the examination of historical artefacts, owing to similar demands for non-invasive methods in both fields. Optical Coherence Tomography (OCT) is no exception. We review the achievements on OCT applications to art conservation and archaeology since the publication of the first papers in 2004. Historical artefacts include a much broader range of materials than biological tissues, hence presenting a greater and somewhat different challenge to the field of OCT. New results will be presented to illustrate the various applications of OCT including both qualitative and quantitative analysis
STUDY OF THE ELECTRONIC GROUND STATE OF BY LASER EXCITED FLUORESCENCE FOURIER TRANSFORM SPECTROSCOPY
No full text C. Jungen, K-E.J. Hallin and A.J.Merer, Molec. Phys., 40, 25 (1980). G. Duxbury and R.N. Dixon, Molec. Phys., 43, 255 (1981). M. Peric, S.D. Peyerimhoff and R.J. Buenker, Molec.Phys. 49, 379 (1983).Author Institution: Herzberg Institute of Astrophysics, National Research Council of CanadaA large number of spin-rovibronic levels of the upper electronic state of have been excited with a single mode rhodamine 6G dye laser. Fluorescence spectra were obtained over a wide spectral range (12000-3700 cm-1) using a Fourier transform spectrometer. Levels of the bending vibration were observed from up to 10, showing the reordering of the K-structure at the barrier to linearity: their observed energies are in good agreement with the predictions of Jungen, Hallin and Merer1 , Duxbury and and Peric, Peyerimhoff and . Numerous vibrational levels involving and were also detected and approximate anharmonic parameters have been deduced
»Der Aufsatz […] war gar nicht so ›sexy‹ wie das Bild.«: Fotografien weiblicher Körper in der DDR-Zeitschrift "Das Magazin" in den 1950er Jahren
No full textTThe present essay features Das Magazin, a popular East German monthly magazine that appeared in the GDR for the first time in 1954. The author analyzes the photographic depiction of women in issues of the 1950s. This analysis starts with the magazine’s prominent and well-researched nude photographs, but later focuses on other images of female bodies, i.e. in photo montages, to explore the different variations in which women were depicted in Das Magazin. A close examination of the images in question, their position and contextualization within Das Magazin allows for a look beyond the pages of the printed product and sheds light on the work of the layout artists. In doing so, the author argues that its creators revived certain visual strategies that had already been cultivated by the popular press in the interwar period and which were also existent beyond the boundaries of the GDR press. Thus, the notion of GDR magazines’ production practices can be enriched by transnational and historical perspectives.The present essay features Das Magazin, a popular East German monthly magazine that appeared in the GDR for the first time in 1954. The author analyzes the photographic depiction of women in issues of the 1950s. This analysis starts with the magazine’s prominent and well-researched nude photographs, but later focuses on other images of female bodies, i.e. in photo montages, to explore the different variations in which women were depicted in Das Magazin. A close examination of the images in question, their position and contextualization within Das Magazin allows for a look beyond the pages of the printed product and sheds light on the work of the layout artists. In doing so, the author argues that its creators revived certain visual strategies that had already been cultivated by the popular press in the interwar period and which were also existent beyond the boundaries of the GDR press. Thus, the notion of GDR magazines’ production practices can be enriched by transnational and historical perspectives
Betrachten, Blättern, Enthüllen, Lauschen, Lesen.: Walter Scotts »THE TAPESTRIED CHAMBER«, das KEEPSAKE FOR MDCCCXXIX, sein zehnter Stahlstich und ihr interaktives Bedeutungsangebot
No full textThis article deals with the aesthetic effects that arise when reading, viewing and handling different media formats. It takes strongly divergent contemporary evaluations of a well-known gothic tale by Walter Scott, »THE TAPESTRIED CHAMBER«, as an opportunity to investigate the medial and material causes of these differences. The author concentrates on the first publication of the tale in autumn 1828 in the opulent annual gift book THE KEEPSAKE FOR MDCCCXXIX, with its numerous steel engravings, and on another early print of the text in the magazine THE OLIO, OR, MUSEUM OF ENTERTAINMENT, with its wood-engraved illustrations. Both prints organise the reading of »THE TAPESTRIED CHAMBER« in specific ways, each setting in motion specific processes of understanding, each stimulating specific aesthetic experiences. This can be traced back in particular to the illustrations placed alongside the prints of the narrative text, to their production, reproduction and presentation in the printed product, to the way in which they are integrated into the flow of reception, which senses of the recipients they address and to which specific forms of media interaction they invite.This article deals with the aesthetic effects that arise when reading, viewing and handling different media formats. It takes strongly divergent contemporary evaluations of a well-known gothic tale by Walter Scott, »THE TAPESTRIED CHAMBER«, as an opportunity to investigate the medial and material causes of these differences. The author concentrates on the first publication of the tale in autumn 1828 in the opulent annual gift book THE KEEPSAKE FOR MDCCCXXIX, with its numerous steel engravings, and on another early print of the text in the magazine THE OLIO, OR, MUSEUM OF ENTERTAINMENT, with its wood-engraved illustrations. Both prints organise the reading of »THE TAPESTRIED CHAMBER« in specific ways, each setting in motion specific processes of understanding, each stimulating specific aesthetic experiences. This can be traced back in particular to the illustrations placed alongside the prints of the narrative text, to their production, reproduction and presentation in the printed product, to the way in which they are integrated into the flow of reception, which senses of the recipients they address and to which specific forms of media interaction they invite
Micro-scale cavities in the slip - and transition - flow regimes
No full textDifferences between Navier-Stokes-Fourier (NSF) slip/jump solutions and direct simulation Monte-Carlo (DSMC) computations are highlighted for a micro lid-driven cavity problem. The results indicate a need for better modelling techniques which at the same time retain low computational cost of NSF models. We also highlight the fact thatmany micro-flows that have been considered are simple planar flows and typical classification systems are defined on such flows. We show that for complex flows, such as thedriven cavity, non-equilibrium effects are more appreciable and their onset occurs at lower Knudsen numbers than expected
Vampires of the "maspok" (mass movement)
No full textRecently, the Serbian mass media, strictly controlled by the prevailing Bolshevik currents in this republic, have showered Croatians with insulting epithets with the goal of spreading fear and slowing down the democratic processes in Croatia. The expression "maspok" is a contraction of "masovni pokret" meaning mass movement. It originated in 1971 after the felling of the liberal leadership of the Croatian Communists by Tito. The negative connotations of this term are similar to those of "nationalism". The author analyzes a book by I. Peric, Ideje masovnog pokreta u Hrvatskoj, Zagreb, 1974. In conclusion, the author invites more objective discussion of the events of 1971 and cautions against viewing the present democratic aspirations of Croatians through the prism of these events
Non-intrusive Methods for Mode Estimation in Power Systems using Synchrophasors
No full textThe power system industry has been going through dynamic infrastructural and operational changes in recent years that have caused more prominent lightly damped electromechanical oscillations. Real-time monitoring of electromechanical oscillations is of great significance for power system operators; to this aim, software solutions (algorithms) that use synchrophasor measurements have been developed for this purpose. Mode estimation is widely accepted as one of the most important applications of wide area and measurement systems. This thesis investigates different approaches for improving mode estimation process by offering new methods and deepening the understanding of different stages in the mode estimation process. One of the problems tackled in this thesis is the selection of synchrophasor signals used as the input for mode estimation. The proposed selection is performed using a quantitative criterion that is based on the variance of the critical mode estimate. This approach differs from the existing techniques based on heuristics or on the analysis of the observability matrix of the power system. The proposed criterion and associated selection method, offer a systematic and quantitative approach for PMU signal selection. It is shown that not only the power system model affects the decision on signal selection, but also the characteristics of the ambient noise excitation that is neglected in observability-based methods. In addition, it is shown that the signal selection problem is similar to the PMU placement problem for this particular application, which means that the proposed solution provides a way of including mode estimation requirements into a global PMU placement formulation. The thesis also analyzes methods for model order selection used in mode estimation. Further, negative effects of forced oscillations and non-white noise load random changes on mode estimation results have been addressed by exploiting the intrinsic power system property that the characteristics of electromechanical modes are predominately determined by the power generation and transmission network. An improved accuracy of the mode estimation process can be obtained by intentionally injecting a probing disturbance. It is shown that further improvement can be accomplished by adequately shaping the frequency spectrum of the probing signal. The thesis presents an optimization method that finds the optimal spectrum of the probing signals. In addition, the probing signal with the optimal spectrum is generated considering arbitrary time domain signal constraints that can be imposed by various probing signal generating devices. Finally, the thesis provides a comprehensive description of a practical implementation of a real-time mode estimation tool. This includes description of the hardware, software architecture, graphical user interface, as well as details of the most important components such as the Statnett’s SDK that allows easy access to synchrophasor data streams.Engineering Systems and ServicesTechnology, Policy and Managemen
A coupled solver approach for multiphase flow calculations on collocated grids
No full textBecause of increasing computer speed and memory, the numerical solution of the incompressible Navier-Stokes equations by a fully coupled approach is an attractive and emerging trend in computational fluid dynamics (CFD) calculations. The main advantage of this approach is an increased robustness due to the implicit treatment of the pressure velocity coupling (Schneider and Raw, 1987; Deng et al., 2001). Although the equations describing multiphase flows appear similar to single-phase flow equations, their nature is often much more difficult due to the presence of volume fractions, large source terms, and gradients of these as well as density. This makes the requirement for a robust solving approach even more desirable. Almost all multiphase CFD solvers today are based upon standard decoupled approaches (e.g. SIMPLE, SIMPLER, PISO, fractional step, and other pressure projection methods (Ferziger and Peric, 2002)) and most often employ a staggered variable arrangement. In this paper, momentum weighted interpolation is used to determine analytical expressions for the cell face velocities which are employed in the multiphase continu- ity equation in a collocated variable arrangement. A special approach is adopted for the momentum weighted interpolation to handle large source terms, volume fractions, and gradients of these. The resulting linearized equations are solved in a fully coupled manner. The fully coupled method is demonstrated on two practical multiphase cases. Firstly, the method is demonstrated simulating volume of fluid (VOF) computations of a gas-liquid flow case. Secondly, the method is demonstrated on solving the continuous part of an Euler-Lagrange gas-solid flow problem. The difficulties in the first case are large source terms and gradients of density, and in the second case the presence of volume fraction and gradients hereof, as well as source terms. The results are in accordance with results from the staggered segregated approach. Moreover, due to the collocated variable arrangement, complex geometries can be easily handeled. Both robustness and computational efficiency of this fully coupled approach are shown
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