首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 640 毫秒
1.
In this paper, we present an application of the infrared thermography to the study of illuminations. In particular, we analyze a 15th century antiphonary from the Biblioteca Angelica of Rome to characterize the conservation state and the structure of the illuminations on the occasion of its planned restoration. We show the results achieved from the stratigraphic investigation of the gilded surface, the parchment substrate and the underdrawing. The obtained information have been, then, used to direct the necessary restoration steps and also to assess the effectiveness of the treatments by a comparative analysis of the thermograms recorded before and after the restoration.  相似文献   

2.
One essential approach in preserving architectural heritage is the documentation of 3D geometries and surface textures of historic buildings. For example, precise colour information, excluding lighting effects, is an intrinsic property of the surface materials of building interiors and exteriors. However, while colour information has been recorded for small sample areas, it has not been accurately documented on the scale of entire building surfaces. This is critical, because building materials decay and their colours fade with time. The goal of this project is to develop a method to assist in recording and documenting the chromatic information of interiors and exteriors of historic buildings with low cost and high efficiency. The method takes advantage of emerging high dynamic range imaging (HDRI) technology, which can store rich information about colour and illumination through digital photography. By recording the colour information, in addition to the geometry and texture information obtained through other existing technologies, we can achieve more complete documentation for architectural heritage. In this paper, we discuss an overview of the problem and present our algorithms for utilizing computer vision techniques to retrieve chromatic information of historic buildings. We also present and discuss our experiments and results of applying our method to studies of lab objects and the Hall of Supreme Harmony in the Forbidden City, Beijing.  相似文献   

3.
The preservation of early 20th century, late 19th century albumen prints is of great concern to collection managers and conservators of photographic materials. Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR) spectroscopic imaging is presented for the first time as analytical methodology for the study of albumen photographs. This paper shows the feasibility of obtaining FTIR images of samples from albumen photographs with a high spatial resolution using a Ge ATR objective coupled with an infrared microscope. The improved spatial resolution compared to FTIR images obtained by the reflection method is due to the high refractive index of the ATR crystal, which gives a high numerical aperture and hence, a higher spatial resolution. The technique reveals detailed information on the organic functional group distribution in the individual layers of embedded cross sections and is used complementary to visual microscopy and scanning electron microscopy/energy dispersed X-ray spectroscopy. The main results of the study are discussed with regard to their historical and artistic significance, and they are compared with data from historical and conservation literature.  相似文献   

4.
Along the Umbria-Marche stretch of the Flaminia Consular Road (220 B.C.) several archaeological finds of the most important monumental works, are well preserved. The stones, employed to build many bridges, substructions and sewerages, are represented by carbonatic breccias whose geological environment of formation and source areas had never been established. On the basis of mineralogical, petrographic and micropalaeontological analyses, two groups of these lithotypes employed in Roman age were distinguished: “monogenic carbonatic breccias” only constituted by clasts of the Maiolica Unit (Late Jurassic – Early Cretaceous) and “polygenic carbonatic breccias” made of fragments (in different proportions) of Calcare Massiccio (Early Jurassic), Corniola (Early Jurassic), Maiolica (Late Jurassic – Early Cretaceous) and Scaglia Rossa (Late Cretaceous – Early Paleogene) Units. The possible source areas of the breccias are compatible with stratified slope-waste to scarp-base deposits of periglacial origin belonging to the Upper Pleistocene. In particular, among the seven investigated areas, we pointed out the most probable provenances (Monte Faeto-Colle, Costacciaro, Scirca, Foci, Secchiano) along the flanks of the Apennine Mesozoic chain of the Umbria and Marche regions. Although the Romans could have exploited the whole thickness of some outcrops (now disappeared) of these carbonatic lithotypes at the deepest part of the valleys, we have constrained a local provenance of the breccias so commonly used in the monumental works of the Flaminia.  相似文献   

5.
The paper presents strategies for the conservation of historical textiles in Egypt that have been in uncontrolled storage and display. The silk textile is highly decorated, multicoloured and dates to the Ottoman period, and was exhibited in case # 12014. The textile has various types of deterioration. An examination and analysis of the textile was undertaken in order to develop a plan of conservation treatment. FTIR was used to identify the kinds of dyes and organic stains, and XR-D was used to identify mordants and dust. Light microscope and SEM were used to identify the kind of fibers, their condition and surface morphology. The effects of cleaning materials on the natural dyes were tested. The researcher designed a new metallic frame support system which has advantages over the wooden frames commonly used in Egypt. This presentation will review the conservation treatment step by step. Poultices were used to remove all the sticking cardboard and adhesive. Old conservation repairs were removed. Separated parts were supported. Cleaning included mechanical and wet cleaning. New silk fabrics dyed with natural dyes were used to complete the missing parts. The textile was supported on new linen fabric which was stretched on a metal frame. The method of exhibition will be discussed. Photographs are included to document the conservation process.  相似文献   

6.
What does freezing human tissue and fluids, or human remains, do to the mobility, temporality, and value of such objects? While Jacques Derrida toward the end of his life considered the consequences for the remainder of burial and cremation, he did not consider freezing, the production of latent or interrupted life. Here I invoke Derrida in discussion of how in the investigation of the fatal brain disease kuru, the partible tissues of the Fore people of Papua New Guinea became frozen spectral commodities in the exchange regimes of modern biomedical science – and how they gained, or retained, value as they were objectified. I follow these Fore – or kuru – valuables into the frozen archive, asking what has become of the remainder, whether it now amounts to anything more than defrosting debris among the postcolonial ruins. I ask what is the value of latent life? Or, rather, who is the value of latent life? This essay therefore serves as a supplement to more economistic estimates of biovalue.  相似文献   

7.
This paper builds upon an empirical study of suppliers of online advertising space in France in order to highlight the plurality of quality conventions that organize the activity of market intermediaries. We show that the market is organized around two different quality conventions, the ‘media’ convention and the ‘direct-response’ convention, each equipped with specific efficiency indicators, pricing methods and selling channels. Then we focus on the growing conflict of territory between the two conventions; we analyse the balance of power between the conventions and the arenas where they compete. We observe that the collective action of the defenders of the traditional world is not (yet) sufficient to contain the pervasiveness of the indicators and metrics from the world of direct-response.  相似文献   

8.
Integrated international marketing of films and related merchandise and close financial ties between distributors and roducers have evolved to cope with the risks of piracy, cost containment, opportunism, and revenue uncertainty. Our reading of the evidence is that this system has dominated because of its efficiency. In search of an explanation of why America remains the centre of this institutional and contractual web, we examine the impact of two world wars, the rapid commercialization of new technologies in the United States by aggressive managers, an open financial system and the ethnic diversity, language homogeneity, and size of the domestic market.We are grateful to Elizabet Filleul, Simon Grant, Peter Harcourt, Ian Jarvie and Janet Staiger for their comments but absolve them of any responsibility for the views presented.  相似文献   

9.
Lime renders are of great importance not only to enhance the appearance of the buildings, but also to protect and preserve old masonries. They constitute a specialized system, composed of several layers, in which each of them depends on the others and carries out some specific functions in order to assure a suitable performance of the whole. Knowledge of the traditional materials and techniques, as well as the know-how, is one of the key points in the maintenance and conservation of lime renders and, by extension, of our Heritage. However, the promotion of the use of cement and the industrialization process, which in the case of Spain took place about the 1960's, caused lime mortars to fall into disuse. In this article, classical treatises as well as the state-of-the-art researches were analysed to compile the properties of lime render layers, on the whole. The knowledge of these characteristics is essential to maintain and repair the existing renders as well as to formulate new compatible ones, while assuring their durability and appropriate performance. Lime is the selected binder for these recommendations because it was widely used as drawn from the literature.  相似文献   

10.
This research evaluates the use of microblasting technique with powdered cellulose as a new tool for dry cleaning documents. Different cleaning tests were conducted on three documents with different properties following this new approach and the results were compared to those obtained with traditional dry cleaning with erasers. In order to assess changes caused to the supports, the treated documents were examined both before and after cleaning with optical and 3D stereomicroscopy, SEM-EDS and spectrophotometry. The results allow the conclusion that microblasting with powdered cellulose is a feasible technique to remove surface dirt or grime on paper documents. This research proves that the new use of the technique does not entail changes to the surface properties of the treated supports. Moreover, powdered cellulose is chemically stable and compatible with paper documents, preventing negative long-term effects derived from the presence of rubber residues that may remain in paper fibres when using erasers in dry cleaning treatments.  相似文献   

11.
This paper engages with the question of the new as the first stage in what may, at a later time, turn into an innovation. Taking our cue from John Dewey, the new is here interpreted as a consequence of indeterminacy. We study practices that induce indeterminacy in order to ‘source’ the new. Based on findings from a collective research programme, we distinguish three ways of inducing indeterminacy: configuring situations, creating things and risking valuations. For each of these ways of inducing indeterminacy basic variations are described and discussed in greater detail. The three ways of inducing indeterminacy are shown to correspond to a present-centred concept of time that distinguishes the now from a past and a future horizon. The cases presented affirm the claim that the new is not an inevitable consequence of the increasing entanglement of technoscience and the economy but something that needs to be sought for, cared for and actively produced.  相似文献   

12.
This article explores the multiple modes of valuation that pervade newsmaking in economic journalism. It does so by exploring the different ways in which journalists at Valor Econômico, the leading economic newspaper in Brazil, compete and cooperate in the production of news. Valor is a paradigmatic case for discussing valuation practices in newsmaking since its institutional promise is to produce news of value. How, if at all, do Valor journalists embrace the promise of producing news that generates value? Elaborating on Stark’s (2009. The sense of dissonance. Accounts of worth in economic life. Princeton University Press) idea of dissonance, it is contended that different orders of worth collide and cooperate within Valor newsroom. Moreover, journalists engage in a variety of valuation practices through which these orders of worth are shaped, defined, and refined, reflecting different understandings of economy and society, and different conceptions of what journalism is good for. I argue that Valor’s direction intentionally fosters a plural space of value dissonance in order to improve the quality of news reporting. I emphasise, however, that these dissonances are only productive against a larger background of consonance about what actually there is to disagree about. The article is based on a seven-month ethnography of Valor’s newsroom in São Paulo between 2013 and 2015.  相似文献   

13.
Nicéphore Niépce carried out a lot of meticulous experiments that led him to the invention of photography. In particular, in the 1820s, he obtained heliographs by coating a substrate with a light-sensitive substance, which was then exposed to light under a paper print made translucent with the help of varnish. The objective of the work described here is to determine how Niépce made these paper prints transparent. Did he use his experimental knowledge on photosensitive resins, or did he apply commonly used recipes of his time to make paper transparent? To date, no studies have been carried out on the varnish used by Nicéphore Niépce and no previous research has undertaken analytical investigations on Nicéphore's prints, using Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR-FTIR) and Gas Chromatography/Mass Spectrometry (GC/MS). In this paper, we identify the varnishes used by Nicéphore Niépce on four transparent prints, now belonging to the Nicéphore Niépce museum in Chalon-sur-Saône, France. The varnish he used was based on a diterpenic Pinaceae sp. resin (most probably colophony). The finding is supported by historical knowledge about varnishes.  相似文献   

14.
The present paper reports a new method for converting ettringite and thaumasite in non-expansible and insoluble phases, for its application in the restoration of concrete artefacts subjected to deterioration through sulphate attack. The salts were synthesized by different processes and, after characterization by means of XRD, FT-IR and optical microscopy, were treated with a series of chemicals in order to induce their decomposition. In particular, different solutions containing barium nitrate, barium hydroxide and ammonium oxalate were used to achieve the complete transformation of both phases in barite, witherite, scarbroite and whewellite. Barium hydroxide seemed to be the most appropriate reactant because the others could give rise to efflorescence within the pores of the mortars by leaving free nitrate or sulphate ions inside the materials. The experimental technique was also tested on two concrete samples collected from the bell-tower of St. Nicholas’ Cathedral in Nicosia (Sicily) with encouraging results.  相似文献   

15.
Abigail Woods 《Minerva》2009,47(2):195-216
Most histories of livestock disease in Britain treat the development of control policy as a government responsibility, to which farmers made little constructive contribution. Similarly, farmers rarely appear in accounts of disease research. This paper uses the example of contagious abortion (brucellosis) at the turn of the twentieth century to reveal that state-farming collaboration in research and policy did in fact occur, and that it operated in various ways, with often unexpected outcomes. The collaborative approach to contagious abortion is partly attributed to its clinical and epidemiological features, which made it an unsuitable candidate for the existing, state-led policy of stamping out disease. It is claimed that such collaboration has been overlooked by historians on account of their focus upon diseases that were amenable to stamping out. This focus needs to change if history is to inform present-day disease governance in Britain, which is founded on the concept of ‘partnership’ between farmers and the state.
Abigail WoodsEmail:
  相似文献   

16.
Earlier work on the supply of labour of artists has shown that, whenever workers derive satisfaction from the process of work, which is usually the case for artists, some traditional results are reversed. As their proponents make clear this analysis is essentially static, as it does not take into account the intertemporal dimension of the supply of labour. The paper argues that to provide such a dynamic analysis three routes are available: the human capital approach, the household production approach and the evolutionary approach. The paper, therefore, is aimed at discussing the adequacy of various theoretical approaches to the treatment of a specific question.  相似文献   

17.
Since 2005, Outstanding Universal Value (OUV) is the standard by which United Nations Educational Scientific and Cultural Organization (UNESCO) evaluates world cultural heritage site suitability. The sites worthy of UNESCO preservation as well as the parameters used to demonstrate OUV are diverse. Our study focused on the uniquely distinguished rural landscape sites and the OUV parameter of integrity. Integrity however, is an elusive concept for which UNESCO provides no definitional protocol, and for which the scientific community objects to a static or pure historical interpretation. Given this, our work aims to analyse the concept of integrity and how it can be used to preserve the heritage of rural landscapes. After reviewing the UNESCO approach, we focused on the international scientific debate on the meaning and application of integrity. We designed and conducted a comparative study of UNESCO rural landscapes selected from the 2011 World Heritage List. Documents describing the historical, rural, and agro-ecological features of each of the fourteen rural sites were analysed. From this, several historical and ecological parameters were chosen as “values to have” and several socio-economic and management parameters were chosen as “values to maintain” to assess the integrity of each landscape. Our results found integrity to be a value of both cultural and natural landscapes and that it is key to site identity. We demonstrated that UNESCO assigns a high value to the following parameters: historical features, traditional crops and local products, land-use and agricultural practice permanence, and the presence of architecture related to agricultural activity. Finally, we found the relationship between culture and nature to characterize best the integrity of a rural landscape, rather than nature or culture alone.  相似文献   

18.
This paper reports petrographic and chemical data and magnetic susceptibility values for trachytes of quarries recognizable within the Euganean Hills and sets out diagnostic parameters for these rocks. The diagnostic scheme proposed is basic for the definition of provenance of trachytes used in ancient artefacts spread over northern Italy. Trachytes were extensively used by the Romans for paving Via Aemilia, the most important road in the Po Plains connecting Ariminum (present-day Rimini on the Adriatic sea) to Placentia (present-day Piacenza on the Po river). Remains of the trachytic flagstones (basoli) used for paving segments of Via Aemilia crossing Regium Lepidi (present-day Reggio Emilia) and Bononia (present-day Bologna) have been characterised petrographically, chemically and also using magnetic susceptibility data. The discriminating scheme proposed here for the Euganean trachytes has been applied to the data obtained for basoli and thus the provenance of each investigated block has been inferred. The rocks sampled at Regium Lepidi mostly come from Monselice (only a few blocks from Monte Oliveto and Monte Merlo) and those of Bononia come mostly from Monte Merlo and, subordinately, from Monte Oliveto and Monselice (only one sample from Monte San Daniele). The dominant provenance of blocks, which is different in the two colonies distant by less than 50 km, suggests that the two segments of Via Aemilia were not built simultaneously.  相似文献   

19.
The rediscovery of the economy as a legitimate object of sociological and cultural enquiry is in full swing. This is long overdue, and follows a remarkable neglect of such issues for many decades. Organization theorists, sociologists and others have long studied organizations, institutions and networks. But a focus on the constitutive or performative role of calculative practices, and their role in the formation of markets and market relations, is more recent. This paper endorses much of the spirit of this recent rediscovery of the economy and economic relations, and suggests a framework for taking forward this overall agenda. First, the paper offers a brief reminder of the curiously punctuated history of sociological concerns with economic calculation. Second, it draws attention to the specificity of accounting as one particular mode of calculation, and reviews the range of studies that have sought to understand and analyse its constitutive capacities. Rather than appealing to economics as the sole or primary constitutive machine for the construction of the economy, it suggests a more differentiated and nuanced view of the range of expertises and modes of calculation that constitute the economy, markets and associated modes of power. Finally, the paper argues for a particular way of analysing the economy and its constituent practices. Most generally, this means suggesting a focus on the governing of economic life, the linkages and interdependencies between calculative practices and programmes for governing, and the assemblages formed.  相似文献   

20.
So why are people attracted to goods? I want to open up a new dimension to this debate by understanding goods as surfaces which are both active and inert. I will do this by considering the history of the material practices of what I will call glamour. Through the manipulation of surfaces, glamour casts a secular spell – often only very briefly – but the moment of traction is, I argue, a real one which needs to be taken into accounts of cultural economy if we are to make sense of modern consumption.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号