X-ray radiography and tomography for monitoring the penetration depth of consolidants in Opuka – the building stone of Prague monuments

Stone consolidation is one of the major restoration treatments used for historical monuments preservation. A natural stone is a complicated heterogeneous porous system making the process of consolidation dependent on many variables. In practical restoration aims, for a given stone type, the selection of a suitable consolidant and consolidation conditions therefore remains a complex issue. The impregnation depth is a key factor for the assessment of the treatment efficiency. The combination of state-of-the-art hybrid pixel semiconductor detectors with newly available micro-focus X-ray sources makes possible to apply X-ray radiography, an ideal non-destructive tool, for penetration depth monitoring. In this study, high-resolution X-ray radiography is used for monitoring the penetration depth of organosilicon consolidants in the Opuka stone. The penetration depth has been evaluated in relation to the time of consolidation, stone porosity and consolidation mixtures properties. The exact influence of the X-ray contrast agent on the consolidation depth has been investigated as well. The information obtained provides supplementary knowledge on the suitability of investigated products for the treatment of this type of stone. In our study, the capabilities of X-ray radiography have been demonstrated on X-ray radiography simple projections, high-resolution computed tomography (CT) as well as on the dynamic processes monitoring. The results thus can serve also as an instrumental and methodological example applicable for consolidation monitoring of other stone types.     

The Church of the Maddalena in Venice: the use of laser in the cleaning of the façade

The Church of the Maddalena was built between 1763 and 1778 by Tommaso Temanza. The building has a central plan and is surmounted by a copper-covered brick masonry dome. The conservation work conducted on the façade has highlighted the superb quality workmanship of the Istrian stone surfaces, which feature extremely fine grain, perfectly regular tooth-chiselling. This finish has led, however, to very specific conditions of decay and laser treatment provided appreciably better results than traditional chemical and mechanical methods. In addition to laser, however, other methods of cleaning were used in order to find the best response to each of the various situations encountered. Indeed it should be emphasized that in restoration it is often appropriate to exploit the potential of several systems, combining their action on the basis of careful preliminary analyses.     

Shadow banking: a story of the Doppelgänger (the Double) in science of finance

ABSTRACT

After the 2007 financial crisis central bank economists in the US produced a map of shadow banking system, a fragile interconnectedness of regulated and unregulated financial institutions, to explain why the crisis had happened. This piece of cartographic work in banking regulation had two aims: (a) to represent the economic reality, including the parts that were not in regulatory sight, with full realism and (b) to develop a regulatory surveillance regime to monitor shadow banking to prevent future crises. This paper problematises the first aim as a peculiar cognitive response to the knowledge crisis of economics which challenges the consensus on modern finance as post-modern Baudrilliardian simulacra. The paper then introduces a cultural economy perspective to explore the regulatory fear in the second aim of the shadow banking analysis with references to the theme of the Doppelgänger (the Double) in the genre of horror stories. Finally the societal consequences of the control oriented epistemological choices of the shadow banking analysis are problematised by using Michel Serres concepts of foedera natura versus foedera fati.     

Uncertainty in the Movie Industry: Does Star Power Reduce the Terror of the Box Office?

Everyone knows that the movie business is risky. But how risky is it? Do strategies exist that reduce risk? We investigate these questions using a sample of over 2000 motion pictures. We discover that box-office revenues are asymptotically Pareto-distributed and have infinite variance. The mean is dominated by rare blockbuster movies that are located in the far right tail. There is no typical movie because box-office revenue outcomes do not converge to an average: revenues diverge over all scales. The studio model of risk management lacks a foundation in theory or evidence, and revenue forecasts have zero precision. Movies are complex products and the cascade of information among film-goers during the course of a film's run can evolve along so many paths that it is impossible to attribute the success of a movie to individual causal factors. The audience makes a movie a hit and no amount of “star power” or marketing can alter that. The real star is the movie.     

“Let’s make lots of money”: the determinants of performance in the recorded music sector

This research analyzes the performance of 467 record labels in eight European countries over a period of 13 years (2003–2015). The main goal is to explain a relative measure of profitability in terms of observed variables, although the nature of the dataset also allows us to include non-observed firm and country effects. To this end alternative models are estimated and three main research questions are tested, namely: (1) the effect of the dual structure of the recorded music market, in which a competitive segment and an oligopoly coexist; (2) the extent and source of the volatility of profits in record labels; and (3) the nonlinear impact of size on performance.     

Monitoring detaching murals in the Convent of Müstair (Switzerland) by optical metrology

The critical condition of detaching historical murals in the Convent of Müstair (Switzerland) prompted a series of investigations and conservation actions over the last 40 years. After percussion tests in 1984/1992, an advanced technology of time-average TV-holography has been applied in 2000 and 2005. The primary aim was to substantiate if and to which extent detaching is in progress. This case study explores characteristics and limits of traditional percussion tests and time-average TV-holography. Extensive mappings by both techniques are carried out on two different structures of wall paintings. The comparison shows that the so-called percussion test – when combined with a close experienced observation – reveals a holistic picture of the general condition of a threatened painting. Time-average TV-holography, on the other hand, yields highly accurate relative information on the spatial distribution of detached areas. Therefore, it is apt to provide an exact answer to the question if detachment is in progress or not.     

20th century artists’ oil paints: The case of the Olii by Lucio Fontana

During the 20th century, many innovative binders have been rapidly introduced to the art world and soon became popular as artists’ paints and pictorial media. However, despite the advantages that new synthetic materials presented, oil paints have never been entirely substituted. Indeed, this paper focuses on the results provided by the scientific analysis of a group works from the oeuvre of Lucio Fontana (1899–1968), all of which created between 1960 and 1964 using oil-based media, and aims to illustrate how oils contained in the pictorial media have influenced these works’ respective ageing and degradation processes. Despite the apparent coherence in the behaviour of many of Fontana's creations, some artworks revealed discrepancies in terms of the physical and mechanical behaviour of the pictorial films and in alterations resulting from degradation processes. Samples taken from case studies belonging to the Olii and Fine di Dio series were analysed using optical microscopy, X-Ray Fluorescence (XRF), Fourier-Transform Infrared Spectroscopy in attenuated total reflectance (FTIR-ATR) and Gas Chromatography-Mass Spectrometry (GC-MS) in order to study and identify the materials employed by the artist and the products of their degradation processes. These analyses gave unexpected but useful results (such as the presence of non-drying or slow-drying oils in the paint formulations) which not only provided us with new insight into the nature of the constituent materials, but also facilitated the elaboration of correct conservation measures and suitable restoration interventions.     

The university world turned upside down: does confidentiality of assessment by peers guarantee the quality of academic appointment?

Reports and Documents

The university world turned upside down: does confidentiality of assessment by peers guarantee the quality of academic appointment?     

Haute finance in the not-so-quiet revolution: colonialisme Anglo-Saxonne and the bombing of la Bourse de Montréal

ABSTRACT

This paper examines a situation in which finance is perceived as imperialist – as immanent to, and serving the interests of, a single ‘culture’ in the colloquial sense. The analysis centres on the long-forgotten 1969 bombing of the trading floor of la Bourse de Montréal (the Montréal Stock Exchange), a moment in an intense phase of the Québécois movement for independence from Canada. Because of the way in which the bombers framed the attack, and its political-economic and discursive contexts, the bombing presents an opportunity to think about key features of the relation between finance and cultural domination or imperialism. These features relate to finance’s specific articulation to the future, uncertainty, and, in the words of the séparatistes of the time, cultural ‘destiny’. The paper has three parts. The first describes the bombing of la Bourse and the public, media, and state responses, linking it to Québécois cultural-political geographies at several scales. Part two places the bombing in the longer-run cultural-politicization of finance in the francophone independence movement, to outline a specifically Québecois critique of finance capital. The third part considers finance’s perceived and real connection to, and thus capacity to shape or constrain, the cultural-political construction of collective possibility.     

The case study of an Italian contemporary art object: Materials and state of conservation of the painting “Ragazzo seduto” by Remo Brindisi

This paper deals with the scientific survey of Remo Brindisi's painting “Ragazzo seduto” (Seated boy), made at the end of the 1950s, that is a symbolic figure of both his personal artistic solitude and the crisis of values determined by the economic boom in the post-war period. In a period of great changes and economic regrowth, the need to find a new style that could be the most authentic and personal as possible pressed the artist to experiment innovative products, including non-conventional support. Photographic and analytical techniques demonstrated the use of innovative products as an experimentation tendency, that pressed the artist to use non-conventional support, industrially treated with plasticized PVC and primed with acrylate polymers and to paint with traditional and industrial pigments mixed with an oil-modified alkyd resin. In the span of a few years, an unexpected and extended degradation on the whole surface of the painting took place, with the consequent formation of lifting and detachment of the paint film. The detected alteration is mainly due to the fast ageing of the employed polymeric materials, actually responsible of the impermanence of many contemporary works of arts. Clarifying the unknown aspects of the Remo Brindisi's stylistic choices together with the deterioration processes of the employed painting materials, this paper highlights the general problems related to the conservation of contemporary art, a neglected area of research in Italy, where more efforts are committed to the enormous and more ancient cultural heritage.     

Balfour’s Mission to Palestine: Science,Strategy, and the Inauguration of the Hebrew University in Jerusalem

In 1925, A.J. Balfour, first Earl Balfour and author of the famous ‘Balfour Declaration’, attended the inauguration of the Hebrew University in Jerusalem. His education and experience of foreign policy equipped him to take a prominent role. However, the conditions of strife-torn Palestine weighed heavily upon him, and raised wider interests of imperial concern. This essay recounts the circumstances leading to his visit, and suggests that, whatever the region’s political destiny, Balfour’s vision of science-based economic development would play an essential role in crafting its future.

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