A study of mechanical properties of papers exposed to various methods of accelerated ageing. Part I. The effect of heat and humidity on original wood-pulp papers

The damage to historical documents and books caused by the acidic character of paper is often manifested as a complete loss of their mechanical properties. Deacidification and restoration of archived paper objects require knowledge of the long-term behaviour of paper before and after repair actions. Our study was focused on the investigation of mechanical properties (tensile strength, stretch, tensile index, zero-span tensile strength, folding endurance) of original papers (one alkaline and three different acidic samples) exposed to five methods of dry-heat and moist-heat accelerated ageing. The degree of paper deterioration upon ageing was significantly influenced by the temperature and relative humidity, along with the intrinsic chemistry of the individual paper samples. The correlation matrix evaluated at a 95% confidence level for tensile strength, stretch, tensile index and zero-span showed linear correlations between these mechanical properties for all the paper samples. However, a linear dependence of folding endurance on zero-span tensile strength was found only for alkaline paper, which revealed the highest resistance to the accelerated ageing tests. In addition, the concentration of paramagnetic semiquinone species in the acidic lignin-containing paper samples was monitored by Electron paramagnetic resonance spectroscopy.     

Fluorescence and photodegradation of Xuan paper: The photostability of traditional Chinese handmade paper

Xuan paper is a type of Chinese handmade paper produced for traditional calligraphy and painting in China since the Tang Dynasty (618–907 AD), and is therefore an important cultural heritage material. In this study, the fluorescence and photochemical properties of Xuan paper were investigated. Xuan paper exhibits auto-fluorescence in the blue spectral range (450–500 nm) and UVA photolysis of the paper resulted in a substantial reduction in the blue fluorescence together with the formation of chromophores absorbing in the visible spectrum, resulting in photoyellowing of the paper. A more significant yellowing of paper was observed when irradiated in the dry state than under wet conditions. The associated photogeneration of hydrogen peroxide and superoxide from three types of Xuan paper samples during irradiation showed a correlation between the yields of reactive oxygen species and their relative yellowing rates. The results are interpreted in terms of sensitised photooxidation via a mechanism of electron transfer involving the fluorophores in their excited singlet states being responsible for the photodegradation of Xuan paper. SEM/EDS analyses were performed on the Xuan paper samples to investigate their morphological and elemental characteristics. Silica-containing fibres characteristic of a special rice straw that grows in siliceous soil were observed in all types of Xuan paper. Micron-sized calcium precipitates possibly formed from the “lime-steaming” manufacture process were shown to protect against the acidification of paper during accelerated thermal ageing.     

Deacidification of paper relics by plasma technology

With the acidification of paper and paper-containing relics becoming increasingly serious, a convenient, effective and harmless method for deacidification has become an urgent necessity in the protection of paper relics. In this research, a novel method for reducing the acidity of paper by plasma technology is presented, which can be used simply at room temperature and atmospheric pressure. The pH of the paper rises to alkalescence rapidly after treatment and remains stable with no color change, with a slight accompanying increase in the mechanical properties of the paper.     

Preservation of aged paper using borax in alcohols and the supercritical carbon dioxide system

Selecting an appropriate paper deacidification agent is very important for the deacidification of paper. The use of three deacidification agents (i.e., iso-butylamine, calcium propionate, and borax) is studied for the deacidification of paper using the immersion treatment by investigating the paper surface pH, alkaline residue, paper whiteness, strength, and other performance indicators. Results show the deacidification by borax solution not only results in the promotion of a proper pH range, high level of alkali reserves, and ignorable influence to paper appearance, but also to the enhancement of the mechanical intensities of paper even after artificial aging. Supercritical carbon dioxide (CO₂SCF), as a solvent system, is used in the deacidification of acidic papers using the borax solution of water and alcohol. CO₂SCF improved the deacidification process by significantly improving the pH value and the base residual value. The borax in supercritical fluids can be better combined with cellulose hydroxyl to improve the mechanical properties of paper substantially. The treatment of borax in CO₂SCF could be an alternative for acidic papers. Aside from improving the pH and depositing a sufficient alkaline residual, CO₂SCF also strengthens the mechanical properties of treated papers.     

Conservation of paper relics by electrospun PVDF fiber membranes

Electrostatic spinning (electrospinning) is a useful technique for producing ultrafine fibers with large specific surface areas and porous structures. Polyvinylidene fluoride (PVDF) is a chemically stable material with extraordinary properties. In this research, PVDF fiber membranes were produced directly on paper surfaces by electrospinning to protect brittle paper relics from environmental damage. Tensile strength and elongation tests for paper with and without the deposited PVDF membranes show that the PVDF fiber membranes can effectively protect paper under an externally applied force under both ambient and aging conditions. Water, insects, dust and mould can be isolated by the compact fiber structure while common gases can pass through freely to maintain a favorable environment for the paper relics.     

New cellulosic titanium dioxide nanocomposite as a protective coating for preserving paper-art-works

We investigate the TiO₂ role in the inherent protection of paper works of art to protect them against damaging effect of ultraviolet radiation, pollutant gasses, mold and bacteria. In this study a cellulosic nanocomposite of TiO₂ were used as protective coating on the surface of paper fibers. This layered nanocomposite can act as a consolidate materials too. Furthermore, to determine how well paper works screen objects from the damaging effects, two accelerated aging mechanisms due to light and heat are discussed. Results show good stability of papers with nanocomposite coating. Also, a good light stability was shown in the colored paper that treated with this nanocomposite. Furthermore, to demonstrate the degree of antifungal properties of coated papers, papers were treated with two common molds and the good preventive effect of coated paper against molds is described.     

A note on Chinese Bamboo paper: The impact of modern manufacturing processes on its photostability

Papermaking has a special place in the cultural heritage of China. Papers made from different types of plant fibers were, and are still used for particular applications. Bamboo paper is a handmade paper that has been traditionally used for book printing and restoration of ancient paper objects since antiquity in China, whereas Xuan paper, the subject of recent previous study, is used for traditional Chinese calligraphy and painting. Following our previous approach on Xuan paper, four modern Bamboo papers manufactured using traditional or chemically-facilitated techniques were artificially aged by UVA radiation and changes to their optical properties were evaluated by reflectance and 3D-fluorescence spectroscopies. Paper samples produced by different methods displayed different fluorescence spectra and UVA photolysis of paper resulted in decreases in the fluorescence intensities and reflectance values, manifested as differing photoyellowing of the papers. Assays of reactive oxygen species, ROS, revealed that papers made by chemically-assisted pulping methods generally produce more hydrogen peroxide or superoxide radicals than those made by traditional methods, which correlates with their relative yellowing rates. Different spatial distributions of calcium and chlorine were also observed by SEM/EDS analysis in the chemically-manufactured papers, probably arising from the specific pulping and/or bleaching chemicals used in their manufacture.     

I DRAW THE LINE AT STRINGING PEARLS

This paper contributes to developing understandings of strong commitments to particular forms of work and how they are sustained against bleak, unstable, exploitative and self-exploitative conditions. It approaches this duality between feeling and structure within the temporal and relational qualities of hope as they are experienced by women jewellery designer-makers in Birmingham Jewellery Quarter. The paper locates these hopes in the Craftswoman's Imperative, a symbolic good and material practice that is concerned with upholding objective values of the truth and beauty of artisanship. The paper details how the hopes of these designer-makers become aligned with those of policy-actors for a reinvigoration of British craftsmanship. It then explores how hope is upheld, and challenged, through sensory experiences of engaging with the material world. Finally, the paper explores these designer-makers’ optimistic practices for achieving the value of the Craftswoman's Imperative.     

The dynamics of product differentiation in the British record industry

The paper conducts a statistical analysis of the dynamics of the sale of new music (product differentiation innovation) in the record industry. In pursuing this goal the paper generates new data and analyses a previously unutilized data set. The paper finds that there is a strong correlation between new music innovation in the audio singles and albums market. This is found to be mainly concurrent in the same quarter and to have a reasonably short product life. The paper discovers that these features also characterise the dynamics of record company performance. The research indicates that record companies are willing to sell singles at a loss due to advertising rather than learning externalities. At the industry level, the paper finds that new music innovation does not effect market size significantly and mainly causes business stealing effects between record companies, with exceptional cases of multiplier effects.     

高职高专院校的工程监理专业教学总结

工程监理专业是高职高专院校的一个实践性很强的专业。文章从工程监理专业的教学、实训和毕业设计三个主要的阶段进行了总结,介绍了常州工程职业技术学院工程监理专业的一些教学经验。     

UNDERSTANDING ORDINARY WOMEN

The paper reflects on the ways market research in Britain helped produce understandings of and information about the ‘mass housewife’ in the 1950s and 1960s. The paper does this through a case study of the market research used and generated by the London subsidiary office of J. Walter Thompson advertising. The paper focuses on key client accounts, as well as the agency's non-product specific research, as a way of exploring how it sought to understand the ordinary housewife and her consumption habits. In exploring JWT London's approach to the ‘mass market’ housewife, the paper draws on recent sociological arguments about advertising and market research that have conceptualized these commercial practices as technologies or socio-technical devices for ‘making-up’ the consumer. However, the paper also seeks to revise certain aspects of this sociological approach. It does this by proposing a more differentiated sense of the various marketing and market research paradigms that were used by advertising agencies in order to contest the claim that post-war market research was subject to growing sophistication under the influence of the psychological sciences. Secondly, the paper seeks to bring a more international and specifically trans-Atlantic dimension to the understanding of post-war market research. US-derived techniques formed a visible presence within post-war British market research and constituted a key point of reference for British-based practitioners. This influence was neither totalizing nor did it go unchallenged, but even as they rejected elements of ‘American’ approaches to the consumer, British practitioners still had to reckon with their intellectual authority and commercial force in this period.     

Tert-butyl amine borane complex: An unusual application of a reducing agent on model molecules of cellulose based materials

The need to preserve cultural heritage on paper requires the setting up of methods and treatments that can be applied to original documents. The cellulose main degradation processes are hydrolysis and oxidation. Only the first one has been widely investigated. The Istituto Centrale per la Patologia del Libro (ICPL) focused its attention on oxidation phenomena and studied a particular class of reducing agents, namely the borane-amine complexes. During the investigation it was found that the borane tert-butylamine complex, besides being the most promising reducing agent, was also able to react with carboxylic functions. In the present study ¹H and ¹³C NMR, Pulsed field gradient NMR spectroscopy as well as Raman spectroscopy were used as analytical tools to disclose the mechanism of the interaction between the borane tert-butylamine complex and the carboxylic functions. Given the complexity of the paper/environment interactions and the subsequent degradation phenomena, we worked on simplified models based on small carbohydrate molecules in order to reproduce the behavior of degraded paper after reductive restoration. Modified D-glucose and D-cellobiose were used in this first step in order to set up the analytical methods before approaching more complex systems such as microcrystalline cellulose and paper. Our results give the experimental evidence that borane tert-butylamine complex is also able to neutralize acidic functions. This finding has important perspectives in paper restoration.     

Rent and Political Economy in Culture Industry Work

This paper locates politics in culture industry work at the organisational and firm level through developing the application of the notion of rent to culture industries as revenues from intellectual properties, and as the more general sense of revenues derived from non-equivalential exchanges. The argument is that politics arises from attempts to establish or eliminate rents. The paper discusses ethnographic research on subjectivity and culture industry work and provides a theoretical account of rent in the capitalist imaginary and in explanations of formal problems of power in the entrepreneurial firm as the basis for the analysis of political practices in culture industries. The paper concludes with a discussion of the relation between rent and subjectivity and politics in neoliberalism.     

Transfiguring identity: Social relationships and intercultural communication between foreign “children” and Japanese “parents”

This paper examines how intercultural communication and interpersonal relationships between Japanese “parents” and African “children” are capable of destabilizing status quo notions of identification. Using qualitative ethnographic data, this paper demonstrates how intercultural interactions unfold in ways that engender new forms of sociality, which underscore the diversifying nature of majority–minority relationships in Japan. Drawing on theoretical insights from applied linguistics and communications studies, this paper suggests that the material products of these relationships warrant increased scholarly attention because they are capable of positing compelling challenges to existing understandings of identity, as well as to the ways various groups conceptualize themselves in relation to others.     

Magnesium distribution in paper subjected to deacidification investigated by means of Laser Ablation Inductively Coupled Plasma Mass Spectroscopy

Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA ICP MS) was used to investigate the distribution of magnesium in paper subjected to selected deacidification mass processes. Paper samples have been taken from the early XX century books, which had been previously deacidified with the use of either Book Saver or Bückeburg process. Both methods incorporate the use of magnesium compounds therefore the enrichment of the paper with magnesium was expected as a consequence of the undertaken deacidification. The aim of our investigation with the use of LA ICP MS was to evaluate a possible variety in magnesium distribution over paper within μ-meter resolution, depending on the applied process.     

Access to and participation in the arts: The case of those with low incomes/educational attainment

This paper looks at the issue of access to the arts in terms of the very unequal attendance at and audiences for the high arts by educational grouping. The meaning of equal access is analysed, recent data for two countries, namely the United States and Ireland, are examined and new evidence is proffered. The constraints/barriers to, and the rationale for, more equal attendance/audiences are examined. The paper concludes by outlining a number of possible responses to this continuing problem.This paper was presented at the 9th international conference of the Association for Cultural Economics, held in Boston, May 8–11, 1996.     

What Has the Visual Artist's Rights Act of 1990 Accomplished?

This paper presents an economic analysis of the Visual Artist's Rights Act of 1990 (VARA) which provides attribution and integrity rights, commonly called moral rights, for defined types of artistic works. The paper shows that these laws may actually harm artists by adding contracting and transaction costs in the art market. For most works, these costs will be trivial because collectors have a strong self-interest in preserving works in good condition. These costs are more likely to be significant, however, for works subject to destruction or alteration in the future, such as site-specific works and works installed in buildings, because purchasers will require waivers rather than risk violating the Act. The paper also examines the few cases that have been litigated under VARA. Consistent with the economic model, these cases involve large-scale works by relatively unknown artists that have been destroyed by building projects. Finally, the paper presents an empirical analysis of state moral rights laws. Nine states enacted these laws prior to VARA. These laws had no significant effect on artist earnings but a positive and significant effect on the number of artists living and working in the state.     

Is Charging Economic?

This paper argues that it is in the interest of the museum profession and the public to halt the further spread of charging for admission to museums. The paper first examines the historical development of admission regimes for museums. Research into the likely impact of charging at the British Museum is then reviewed. The final section compares the level of subsidy at charging and non-charging museums.     

Does public support make a difference,and for whom?

The paper discusses the impact of gender on the income level and public support of artists in Finland. The empirical data is based on a research project carried out in the Arts Council of Finland. The data discussed in this paper indicated that the average income level of women artists is lower than their male colleagues. There was, however, no significant evidence of a gender bias in the distribution of public support for artists. The variation in the economic situation of artists seems to be notably stronger according to art form than according to gender.Based on a paper presented at the 9th international conference of the Association for Cultural Economics, held in Boston, May 8–11, 1996.