共查询到20条相似文献，搜索用时 62 毫秒
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ABSTRACTLighting a cultural heritage artifact requires balancing visual perception with preventive conservation, by providing the best lighting (in terms of spectral distribution and quantity) to enable the viewer to appreciate details and color, while limiting photo-induced degradation. The paper outlines the methodology applied by a multi-disciplinary team while lighting the Shroud of Turin at its last public exhibition in 2015. The methodology considered the special requirements of the Shroud, including exposure to ultraviolet light, while providing appropriate display conditions that would meet audience expectations. The desired appearance (readability of the body image and color) was defined with the help of Shroud researchers and confirmed by subjective tests, while appropriate light levels for preservation were set in agreement with standard requirements and using knowledge of the degradation of linen in visible and UV light. The installation provided a controlled environment and a managed visitor route to the Shroud, assuring excellent perception of both details and color, with the lowest illuminance level about 15?lx. 相似文献
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The surviving gilded and polychrome altarpieces and sculptures in Portuguese churches, and the historical documents relating to them, offer an opportunity for understanding material and technological choices regarding gesso grounds. This paper focuses on the historical documentary research about gessoes — one aspect of a wider research project which also involved investigation of physical/chemical evidence, and archaeological reconstructions of gilded gesso grounds. Documentary research sheds light on the meaning of the terms used in historical documents, and on artists’ choice of materials and practices, production, and trade patterns of materials. It informs technological investigations and conservation decisions. The paper also stresses the importance of the evidence gained by using the historical and archaeological methodology applied in material culture studies, in which documentary, analytical, and experimental information complement and/or elucidate each other, leading to a comprehensive understanding of this technology. 相似文献
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ABSTRACTThis work presents a study of samples of the mural painting The Allegory of the Industrial Development of São Paulo (Alegoria ao Desenvolvimento Industrial Paulista), made in the city of São Paulo, Brazil, by the artist Fulvio Pennacchi. Using transmitted light petrographic microscopy, scanning electron microscopy coupled with energy dispersive X-ray spectrometry, and X-ray fluorescence, the stratigraphy, the textures, the mineralogy, and the chemical compositions of the mural were established; therefore the painting techniques, pigments, and materials applied by the artist were identified. The mural was painted with the fresco technique and variations. This technique involves the use of materials of mineral origin, both in the support and for the pigments. About the artist’s relevance, Fulvio Pennacchi is considered an important muralist of his time, being one of the pioneers in the production of frescoes in Brazil. The mural, measuring approximately 11?×?6?m, painted in 1954, was removed from where it was originally made, in consequence of a fire that affected the place. Specialized engineers transported it, and today it is stored awaiting restoration. The data presented here can support the process of restoration of the mural, as well as contribute to the improvement of protocols for the analysis of works of art, and to the historical record of mural painting techniques over time. 相似文献
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Samir N. Hamade 《International Information and Library Review》2013,45(3):139-150
AbstractThis paper attempts to shed some light on the scientific communication behavior of Arab authors in library and information science by studying the characteristics of the literature used by these authors. A bibliometric study by way of citation analysis was conducted on the articles published from 1978 to 1988 in Maktabat Al-Idarah, an elite Arab scholarly journal in the field. It was concluded from this study that English literature is the main source of information for Arab authors in library and information science. They rely on English literature that is between 5 and 15 years of age more than on their own literature and use books more than any other form of publication. They cover almost all areas of the field with special emphasis on technical services as represented by cataloging, classification and aquisition, library administration and library education. Local materials published in their own country were also important. 相似文献
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The impact of the spectral composition of light on the discoloration of paint pigments has been investigated for the case of lead chromate sulfate, an unstable yellow pigment used by Vincent van Gogh and other painters. With LEDification, museum lighting is moving from using halogen to LED lamps. LED light sources have a significantly different spectral composition than halogen lamps. To understand the impact of these differences on pigment stability, the wavelength dependence of pigment discoloration was determined. Contrary to the expectation that lower wavelength photons induce more damage than higher wavelength ones, UV (394?nm), blue, and cyan light all lead to similar levels of discoloration of a pigment for the same level of radiant power. By understanding this wavelength dependence, it becomes possible to create white light LED lamps with a spectral composition tuned to minimize the degradation effect. An existing LED solution with a modified emission indeed resulted in 30% less color change in the experiment than halogen. Furthermore, a method is proposed to optimize the LED spectra by tuning to the properties of each specific artifact. Simulations show that this can reduce the damage of the light source by 45% in specific cases. 相似文献
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《文物保护研究》2013,58(3):102-107
AbstractBorobudur was constructed around 800 a.d. and abandoned in the 10th century. The history of its rediscovery in the early 19th century and subsequent restoration are discussed. An outline is given of various factors leading to the present preservation programme. The structure of the monument is described. Borobudur recalls the most elementary form of a stupa but is also a replica of the universe in Buddhist cosmology.The monument measuring 123 meters at its base is c. 31 meters high and has 504 statues and eleven series of bas-reliefs consisting of 1460 scenes; the total length of the sculptured surface is c. 3 km. The foot of the monument with the lowest series of reliefs was hidden by the ancient builders by a stone encasement. The significance and function of Borobudur are discussed from an historical point of view. 相似文献
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《文物保护研究》2013,58(1):140-144
AbstractThis paper presents the program initiated to conserve the templete in the Mudéjar Cloister in the Royal Monastery of Our Lady of Guadalupe. The program included evaluation of the original materials, development of repair materials and design of a conservation program for the templete. The paper concentrates on the analysis and conservation of the stuccos of the templete, which is a typical mudéjar-style structure of molded brick with an exterior stucco finish. Samples of stucco from the templete were analyzed by microscopy, both reflected and transmitted light; acid digestion (gravim～tric analysis); water vapor transmission rate; and Fourier transform infrared spectroscopy. Samples of pigments and salts were identified by microchemical methods. Data from these analyses were used to develop a replication stucco mix and a grout mix that would be physically and chemically compatible with the existing materials. The process of developing the mixes is described. Application of these materials to the conservation of the templete is outlined. The stucco mix was used for repairing the upper stage of the templete, which was largely devoid of its original stucco coating, and the grout was used to stabilize the stuccos of the base, which were largely intact but detached from the underlying brick. 相似文献
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Anna L. Shparberg MLS 《Slavic & East European Information Resources》2013,14(4):291-303
This article draws attention to a segment of the Russian literary market that is underrepresented in American research library collections, namely light popular fiction and particularly the titles that belong to the detektiv genre. The results of an informal survey of scholars and bibliographers are presented and collection patterns are briefly discussed. Following an exposition of the available collection development tools for Russian light fiction, the article concludes with a call for greater emphasis on collecting these materials in North American research libraries. 相似文献
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The protection of works of art and cultural assets against light-induced aging is vital when planning exhibitions. Newly developed lighting systems render the selection of suitable light sources more difficult, not least in the context of energy–economical systems. This study accordingly examines different lighting systems (fluorescent tubes, halogen lamps, low-voltage metal halide lamps, and LED lamps) in terms of the damage potential they hold for the materials concerned. The changes in color were evaluated using the CIEDE2000 color-difference formula. This study focuses on selected organic materials and shows that changes in color already occur after only a brief exposure time. The color changes induced by the fluorescent tubes were consistently more intense than those induced by the other light sources. The results obtained with the remaining lamps show that the color changes depend more on the material under investigation than on the source used. The changes determined after a relatively short exposure period (five months) vividly demonstrate that exposing sensitive materials to light for longer terms (as is the case during a permanent exhibition) is most definitely a non-viable option. 相似文献
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《文物保护研究》2013,58(4):257-266
AbstractA study of the accelerated light fading behavior of face-mounted color photographic materials has shown that alterations on the surface of the materials influence their fading characteristics. With the help of spectral density measurements it became apparent that the application of materials such as silicone rubber, adhesive film and acrylic sheeting, but also laminating films, onto the surface of the prints accelerated the degradation of the colorants, especially the yellow dye, in chromogenic materials. In the case of silver dye bleach materials, however, the opposite effect was observed. The influence of the material combination on the stability of face mounted color photographic prints was demonstrated to vary considerably. In order to better assess the inherent damage potential of the materials themselves, these were examined by means of instrumental analysis and measurements of pollutant gasses. Besides off-gassing compounds such as acetic acid and changes in pH caused by aging of the adhesive, face-mounting with a rigid plastic sheet (acrylic glazing) also affected the respective fading behavior of the various materials that were tested. 相似文献
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From work to text to document 总被引：1，自引：1，他引：0
David Beard 《Archival Science》2008,8(3):217-226
The defining trope for the humanities in the last 30 years has been typified by the move from “work” to “text.” The signature text defining this move has been Roland Barthes seminal essay, “From Work to Text.” But the current move
in library, archival and information studies toward the “document” as the key term offers challenges for contemporary humanities research. In making our own movement from work to text to document, we can explicate fully the complexity of conducting archival humanistic research within disciplinary and institutional contexts
in the twenty-first century. This essay calls for a complex perspective, one that demands that we understand the raw materials
of scholarship are processed by disciplines, by institutions, and by the work of the scholar. When we understand our materials
as constrained by disciplines, we understand them as “works.” When we understand them as constrained by the institutions of
memory that preserve and grant access to them, we understand them as “documents.” And when we understand them as the ground
for our own interpretive activity, we understand them as “texts.” When we understand that humanistic scholarship requires
an awareness of all three perspectives simultaneously (an understanding demonstrated by case studies in historical studies
of the discipline of rhetoric), we will be ready for a richer historical scholarship as well as a richer collaboration between
humanists and archivists. 相似文献
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Background: The way a person responds to health information, for instance by actively seeking it out or avoiding it, is an important part of overall coping with health issues. This study starts from the assumption that there are individual differences in information behaviour in charged contexts such as when faced with the stress and anxiety of compromised health. Objective: To shed light on mechanisms through which personal characteristics (locus of control) and world views (sense of coherence) influence health information interest and health information seeking in relation to health status. Method: The methods used in this study are quantitative. The material consists of data procured via a postal survey, which was posted to a representative sample group consisting of 2500 Finnish citizens aged 18–65 years. The statistical analysis consists of F‐tests for means, frequency analyses and cross tab‐analyses (chi‐square and Goodman–Kruskal gamma). Results: Persons with perceived health problems are comparatively more characterised by external locus of control and by lower motivation to act on health issues. Conclusion: More research is needed before these complex relationships are fully understood. However, the results of this study show that internal locus of control entails high interest in, and low avoidance of, health information. 相似文献
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Bast fibres have been commonly used as a textile material in Northern Europe since Neolithic times. However, the process of identifying the different species has been problematic, and many important questions related to their cultural history are still unanswered. For example, a modified Herzog test and the presence of calcium oxalate crystals have both been used in identification. In order to generate more reliable results, further research and advancement in multi-methodological methods is required. This paper introduces a combination of methods which can be used to identify and distinguish flax (Linum usitatissimum), hemp (Cannabis sativa), and stinging nettle (Urtica dioica). The research material consisted of reference fibres and 25 fibre samples obtained from 12 textiles assumed to be made of nettle. The textiles were from the Finno-Ugric and Historical Collections of The National Museum of Finland. The fibre samples were studied by observing the surface characteristics and cross sections with transmitted light microscopy, and by using a modified Herzog test with polarized light, in order to identify the distinguishable features in their morphological structures. The study showed that five out of 25 samples were cotton, 16 nettle, one flax, and one hemp. Findings from two samples were inconsistent. The results show that it is possible to distinguish common north European bast fibres from each other by using a combination of microscopic methods. Furthermore, by utilizing these combined methods, new and more reliable information could be obtained from historical ethnographic textiles, which creates new vistas for the interpretation of their cultural history. 相似文献
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Matteo Calabrese Nicoletta Odisio Lorenzo Appolonia Andrea Bernagozzi Jean Marc Christille Annie Glarey 《文物保护研究》2018,63(5):43-50
ABSTRACTForecasting the dynamics of alteration in materials, in particular the timescale of degradation, is relevant to preventive conservation, and great deal of effort has gone into developing new models for the kinetics of physical and chemical phenomena affecting materials. Creating monitoring systems able to assess the evolution of degradation processes that inform intervention programs is necessary to ensure the protection of historical and artistic heritage. The Research Unit for Integrated and Predictive Systems (SIP) is presented: it develops new tools and algorithms to study the alteration of materials using non-invasive techniques and passive monitoring, as well as new mathematical models to predict how the surfaces of materials degrade with time. The paper focuses on the Arch of Augustus and presents initial results from two virtual sensors used to ‘monitor’ environmental conditions outdoors. These systems do not need a permanent, invasive network of sensors in situ. They rely instead on local infrastructure for measuring air quality, and adopt smart information fusion algorithms to predict the environment around the cultural heritage site. Virtual sensors can provide an effective control system that highlights specific conditions linked to specific forms of alteration. 相似文献
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The construction and examination of test panels is an ad hoc procedure, necessary for every spectral imaging study of paintings. Despite the common features, almost every scientific team follows a different way of construction. Furthermore, many of these approaches are not adequately documented in the relevant papers. Failure to use common language and practice leads to confusion about properties of materials and paint layers that have been overall examined by the scientists, as well as the validity of the results and their exploitation in several conservation applications. The present theoretical approach points out the need for common protocols for the construction of test panels and draws general principles as a flow chart on which they should be based. 相似文献