Peer effects on youth screen media consumption in Catalonia (Spain)

It is well known that young people are major consumers of screen media and that their peers are one of the principal determinants of youth behavior as regards their patterns of consumption and other activities. On the basis of these premises, the purpose of this paper is to analyze the influence of classroom peers on youth screen media consumption. More specifically, it considers the time spent watching TV, playing console games and surfing the Internet. Data are drawn from a single representative survey of secondary school students aged 14–16 in Catalonia (Spain) in 2008. Having accounted for problems of endogeneity, our analysis shows that peer consumption has a positive and statistically significant effect on an individual’s console and Internet use. While the magnitude of this effect is not great in the case of the former use, peer effects are quite marked in that of Internet consumption. Moreover, gender differences are observed when media consumption is examined separately. Thus, peer effects on console use are statistically significant only for boys, while the influence of peers on an individual’s Internet use is higher among boys than it is among girls.     

Environmentally-induced stone decay: the cumulative effects of crystallization–hydration cycles on a Lincolnshire oopelsparite limestone

An investigation has been undertaken at St Andrew’s church, Walpole St Andrew, Norfolk, to establish the underlying causes of the observed stone decay to the upper parts of the six stone piers. The stone decay was first recorded in the early 1930s. The salt-contaminated masonry within the church has been shown to undergo severe salt decay during the summer, with little damage occurring over the winter months. The south aisle piers have been shown to decay 2.5 times faster than the north aisle piers. Although crystallization–hydration cycles have been identified, the rate of decay is at its greatest when the cycling is relatively infrequent. This was not the expected trend. Furthermore, it has been shown that during extended periods where the ambient relative humidity is less than 75%, the rate of decay reaches a maximum. It is the length of this ‘drying’ period that apparently has the greatest influence on the rate of decay and could explain the significant difference in the rate of decay between the south and north aisle piers. The results have serious implications for passive conservation, where it is often recommended to lower the ambient relative humidity to well below the equilibrium relative humidity of the salt contaminant, to avoid crystallization–hydration cycles. Since, at the time of building, the church was situated on the coast, it is possible that the sodium chloride contamination occurred during the building process (1440–1520), particularly since the area was prone to sea-flooding at this time. Alternatively, the salt could have been applied as a treatment during the general restoration of 1897. Whatever the source of the salt, it seems likely that the ambient environment was changed by the insertion of a sealed floor in 1897, which could account for the onset of the salt decay.     

Price determinants and genre effects in the Korean art market: a partial linear analysis of size effect

This paper examines the price determinants of paintings in the Korean art market in the context of a hedonic price regression to investigate whether the hypothesis of the modified unit pricing system holds for the pricing of Korean modern and contemporary paintings. Using Korean auction data, I show that the parametric results provide overwhelming evidence that Korean art pricing does not function in accordance with the modified unit pricing scale. However, I re-examine this hypothesis using a semiparametric partial linear regression that does not require the prespecification of a functional form prior to estimation. Rather, the semiparametric approach allows the data to determine the exact form of the size-price profile. This result confirms that the modified unit pricing system applies to the Korean contemporary and modern painting market.     

The effects of having more than one good reputation on distributor investments in the film industry

Reputations of organizations and its individual members are valuable resources that help new organizations to get access to investment capital. Reputations, however, can have different dimensions. In this paper, we argue that an individual??s reputation along a particular dimension will have a positive effect on the behavior of investors when it is role congruent. In addition, we argue that also scoring favorably on the role-incongruent dimension at the same time??or, in other words, engaging in reputational category spanning??will weaken the positive effect of the role-congruent reputation. Our empirical setting is the film industry where we study the effect of the two main dimensions of reputation in cultural industries, artistic and commercial, of both directors and producers on the size of the investment by distributors. In this study, artistic reputation is based on professional critics?? reviews and commercial reputation on box office performance of the films in which individuals were involved in the past. We find that the commercial reputation of a film producer based on past box office performance has a positive effect on the size of the investment by film distributors. In addition, we find that directors who at the same time combine both a favorable commercial as well as an artistic reputation actually receive a lower investment from film distributors.     

Effects of condensed water on limestone surfaces in a marine environment

We have evaluated the effects of condensed water on limestone surfaces through a procedure that foresaw the cooling of the samples before their exposition to the open air, so that the condensation phenomena could occur easily. The effects of the condensed water were evaluated by measuring the weight change of the samples, through SEM observations and analysis of the 3-D profile, using laser profilometer. The results show the weak action of condensed water on the stone surface, particularly if compared with that of rain.     

Study of the stability of a series of synthetic colorants applied with styrene-acrylic copolymer, widely used in contemporary paintings, concerning the effects of accelerated ageing

This study examines the materials of a contemporary pictorial artwork, belonging to the Macedonian Museum of Contemporary Art in Thessaloniki (Greece), and needing conservation. The combined use of micro-FTIR and micro-Raman spectroscopy allowed the identification of almost all painting materials. Moreover, the stability of a series of synthetic pigments towards accelerated ageing is investigated in applications using the contemporary binding medium styrene-acrylic copolymer. The pigments in question are: Hansa yellow PY3 and PY74, quinacridone PV19 and PR122, naphthol AS PR112, phthalocyanine green PG7 and blue PB15, dioxazine PV37, van Dyck brown PBk11, ivory black PBk9, and titanium dioxide PW6. The organic pigments were applied alone or mixed with titanium dioxide, in rutile form or as a mixture of rutile/anatase. The experimental swatches were subjected to ageing tests, and subsequently studied as to colour changes by means of colorimetric measurements, and as to the molecular structure differentiations by infrared spectroscopy in reflectance mode. The ageing tests included exposure to high temperature and humidity (90 °C, 60% RH) and to ultraviolet radiation (350 nm, 30 °C and 50% RH, with a substantial temperature increase at 90 °C for 3 days). The greater colour difference is caused by high temperature and humidity, whereas paint layers containing TiO₂, and especially the mixture of the forms rutile/anatase, prove very susceptible to ultraviolet radiation, demonstrating a significant colour difference and extended molecular changes.     

Analysis of calcium acetate efflorescences formed on ceramic tiles in a museum environment

Salt crystallization is a major cause of damage in porous materials such as stone, brick and ceramics. The paper reports results of an analytical study on tiles of glazed ceramics that are seriously damaged by acetate salt crystallization. Measurements of the ionic composition of the salt mixture in the tiles and in the efflorescences were carried out. Based on the available information on the phase equilibria in the system comprising of the main constituents chloride, nitrate, acetate, calcium and sodium, the crystallization pathways of the various solid phases are traced. It is shown that a combination of qualitative XRD analysis of the phases present in the efflorescences together with a quantitative determination of the ionic composition is sufficient for the quantitative analysis of major crystalline species in the efflorescences, i.e. Ca₃(CH₃COO)₃Cl(NO₃)₂ · 7H₂O, thecotrichite, and NaCl, halite. The concentrations of these salts are obtained from a solution of the mass balance by least squares analysis. Their formation from the salt mixtures present in the tiles that are subject to acetic acid vapor attack is consistent with the solubility diagram of the above mentioned quinary system. Finally, the possibilities of preventive conservation of salt contaminated ceramics in typical museum environments are discussed.     

Canaletto’s paintings open a new window on the relative sea-level rise in Venice

The paintings by Canaletto (1697–1768), made with the help of a camera obscura, are just like real photographs, documenting as they do the Venice of the XVIII century with an accurate reproduction of all the details. The brown–green front left by the Laminaria, an alga living between the high and low tide, constitutes a precise biological indication of the average level of the high tide. By comparing the level of this front at Canaletto’s time with the present level, we can calculate/discover the relative sea level rise which has occurred in the last two and a half centuries.     

Influence of different types of heating systems on particulate air pollutant deposition: The case of churches situated in a cold climate

The influence of three types of heating systems (electrically heated pews, hot air blow heating and provisory electrical (infrared) heaters) on the transport and deposition of particulate pollution was investigated in churches located in a cold climate. Two methods were applied for the analysis of aerosol samples collected inside and outside the churches: energy dispersive X-ray fluorescence analysis and electron probe X-ray microanalysis. The results show that all the heating systems re-suspend the particulate matter brought from outside. However, the extent of re-suspension of the systems is different. It is also shown that the hot air blow heating, – the oldest design of the studied systems, – warming the church by blowing in hot air could generate organic particles. Such particles can cause soiling, and/or blackening of works of art present in the church. The application of this heating system also provoked the deterioration of the plastered walls, thus leading to the creation of an extra internal source of Ca. The other two heating systems (more modern) demonstrate less influence on the works of art regarding aerosol deposition.     

超大城市中的公共空间生活意象 ——夜市从纯商业向文创活力方向发展研究

中国城市的公共空间中一直存在群众自发形成商业活动的传统.在超大城市拥挤且有限的公共空间里,如何创造群众自发参与的公共空间,形成积极的城市生活意象,是值得深入思考的问题.中国有很多"草根夜市",是大城市作为"不夜城"的重要组成部分.但随着城市的发展,传统的夜市形式逐渐被取缔.以上海、武汉等超大城市为研究对象,调研夜市发展...     

A methodology for the identification of glass panes of different origin in a single stained glass window: Application on two 13th century windows

The chemical composition of 11 glass panes originating from two 13th century non-figurative windows were analyzed by means of Scanning Electron Microscopy–Energy Dispersive X-ray system (SEM-EDX). The windows were discovered in the back-wall of the triforium during the restoration of the choir of the cathedral St. Michael and St. Gudule in Brussels (Belgium). In order to determine if these windows were fabricated with glass of different origin or not, the compositional difference between the panes were compared with the variation in composition as a result of the following causes: (1) compositional fluctuation between panes cut from the same sheet of glass, (2) compositional fluctuation caused when panes are cut from different sheets that were made with the same batch, (3) compositional fluctuation caused when the glass is made from different batches at the same production center, and (4) compositional fluctuation as a result of glass produced at different fabrication centers.     

基于数字技术的历史街区空间更新与文化价值活化设计 ——以南京南捕厅历史街区为例

以南京市南捕厅历史街区为例,通过综合运用三维地理信息系统、多元异构时空数据分析、历史信息比对等技术手段,展示了复合历史空间导向的数字化保护与更新实践.通过无人机倾斜摄影测量技术,对历史街区的大场景进行纹理数据采集,构建整个历史街区的三维数据模型.在历史研究的基础上,为历史街区更新构建合理的历史空间形态框架,并对历史街巷...