Pore structure of historic and repair Roman cement mortars to establish their compatibility     

Anna Klisi&#x;ska-Kopacz  Renata Ti&#x;lova  Grzegorz Adamski  Roman Koz&#x;owski 《Journal of Cultural Heritage》2010,11(4):950-410

Mercury porosimetry was applied to the study of pore structure of the historic Roman cement mortars representative of different locations in Europe and time periods as well as different application techniques from architectural castings to in situ formed renders and profiles. Three categories of pores were found to coexist in the mortars. The finest pores, with diameters below 0.1 μm, are present within the hardened aged Roman cement matrix. The larger ‘air’ pores, with diameters between 0.2–2 μm, are due to the evaporation of the excess unbound water and restricted hydration. Pores larger than 2 μm are rare and, in general, can be related to microcracking induced by shrinkage drying and mortar weathering. The mortars have rarely been found to develop a dense fine-porous microstructure characteristic of the ideal conditions of moist-curing; massive architectural castings being the only exception identified. The presence of larger ‘air’ pores was, in turn, almost universally observed. The investigations of the freshly prepared Roman cement mortars have revealed that the restricted hydration could be due to the exposure of the freshly laid surface to dry real-world external environments, a high water-to-cement ratio in the original mortars, or the drawing of water from the stucco mass due to insufficient pre-wetting of the porous masonry. The insufficient reactivity of historic cements, resulting from a high content of over-burned, non-reactive cement components or coarseness of the cement grains, could be another reason for yielding poorly hydrated mortars in the past. In general, Roman cement stuccoes are in an excellent state of preservation in spite of their usual exposure to polluted urban environments for more than a century. Therefore, the coexistence of Roman cement mortars of widely different pore structures has not brought about any problems of incompatibility which field observations could reveal. The Roman cement repair materials have been found to develop pore structures similar to those of historic mortars. Therefore, they are in broad terms compatible with historic masonry or stuccoes. However, the porosity and strength of the repair materials can be controlled by a careful manipulation of the water-to-cement ratio of the mix to adapt them better to the properties of the host material.  相似文献   

Celebrating Chinese New Year Worldwide     

Zi Yue’er 《中外文化交流(英文版)》2012,(3):4-11

<正>During the Spring Festival in 2012, the Cultural Ministry of China, along with China's Ministry of Foreign Affairs, Ministry of Education, State Administration of Radio, Film and TV and the State Council Office for Overseas Chinese Affairs  相似文献   

Introduction     

Stanley Rothman  Alan Charles Kors  Dennis O’Brien  William B. Allen  John Agresto 《Academic Questions》1999,12(4):13-18

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Bystander Behaviour Among Italian Students     

Anna C. Baldry 《Pastoral Care in Education》2005,23(2):30-35

This paper reports the Italian data on the bystanders' project. In the last decade, several studies have been conducted on the prevalence and nature of bullying among primary and secondary students as well as on individual and social risk factors, illustrating that bullying in the Italian context is a widespread phenomenon. No research has been conducted, so far, on the 'bystander' behaviours of those students who see other peers being bullied or bullying others in school either physically, verbally or through sexual coercion (i.e. touching girls). The study was conducted with 594 students (51.9% boys and 48.1% girls), aged 12–16 years old, with a mean age of 13.1 (SD=0.87). They were recruited from six different middle schools, two in each of three different sites in Italy: Northern Italy (Vercelli), Central Italy (Rome) and Southern Italy (Catania). Results showed that though the most likely reaction is supporting the victim by trying to discourage the bully, gender differences emerged, with girls more likely than boys to support the victim and boys more likely to encourage the bully or simply ignore. Differences resembling the same pattern emerged also with regard to own involvement as a bully or a victim. Findings are discussed by looking at possible applications for intervention.  相似文献   

Editorial     

Anna Robinson‐Pant  Karen Evans 《Compare》2008,38(4):381-383

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The impact of electric overhead radiant heating on the indoor environment of historic churches     

Lucyna Samek  Anna De Maeyer-Worobiec  Zoya Spolnik  Lszl Bencs  Velichka Kontozova  &#x;ukasz Bratasz  Roman Koz&#x;owski  Ren Van Grieken 《Journal of Cultural Heritage》2007,8(4):361-369

The impact of electric overhead radiant heaters on the microclimate, air flows, transport and deposition of suspended particulate matter (SPM) was monitored between March 2004 and March 2005 in the historic churches of Saint Michael Archangel in Szalowa and Saint Catherine in Cracow (Poland). The measurements show that although irradiation at the floor level increases temperature and reduces relative humidity in the interior of the church, the effect out of the heated zone and for the surfaces sheltered from irradiation is very limited, i.e. their extent is comparable with natural fluctuations inherent to the local climate of the church. The radiant heaters proved to generate little convectional flow of the air. Therefore, the heating system was not found to increase the concentration of SPM indoors; in particular, no re-suspension of particles already present in the church was observed. This work has demonstrated that the overhead radiant heaters are capable of providing localised heat to the areas where people congregate without adversely affecting painted walls and the works of arts displayed in churches. Care, however, should be taken that sensitive works of art are not exposed to the direct infrared radiation.  相似文献   

Museums,schools and geographies of cultural value   总被引：1，自引：0，他引：1  

Eilean Hooper-Greenhill  Anna Woodham 《Cultural Trends》2009,18(2):149-183

This article explores a paradox and a possibility that have emerged from two pieces of policy-related research concerning educational use of museums within England. The paradox relates to the use of museums which, whilst widely perceived as rather elitist institutions, appear from a postcode analysis of school visits to museums to be visited by large numbers of schools located in areas of social deprivation. The present analysis further explores this paradox, drawing on revised postcode analysis and governmental indices of multiple deprivation and income deprivation affecting children. The analysis supports the contention that museums attracted visits from schools located in areas with some of the highest levels of deprivation, although it suggests that this result needs to be considered in relation to regional differences in areas of social deprivation, the location of museums and the differences between individual and area-based measures of deprivation. Attention is then drawn to the potential of considering museums through a geographical perspective, and specifically through Foucault's notions of primary, secondary and tertiary spatializations. It is argued that primary spatializations encompasses how museums are conceptualized and classified; secondary spatializations concern how various elements of museums are articulated together; and tertiary spatializations relate to the placement of museums in wider societal contexts and processes. It is suggested that the postcode analysis of school visits points both to the significance of considering tertiary spatializations relating to the social circumstances of museum visitors but also raised questions concerning primary spatializations of museums. Attention is drawn to changes in the classification and grouping of museums, and how these often encompass geographically based criteria related to the social reach of museums. The article ends by considering the degree to which museums might seek to further change their primary spatialization to reflect tertiary spatializations relating to cultural value.  相似文献   

‘We Have to Go Where the Money Is’—Dilemmas in the Role of Nutrition Scientists: An Interview Study     

Anna Paldam Folker  Lotte Holm  Peter Sandøe 《Minerva》2009,47(2):217-236

In Western societies scientists are increasingly expected to seek media exposure and cooperate with industry. Little attention has been given to the way such expectations affect the role of scientific experts in society. To investigate scientists’ own perspectives on these issues eight exploratory, in-depth interviews were conducted in Denmark with reputable nutrition scientists. Additionally, eight interviews were held with ‘key informants’ from the field of nutrition policy. It was found that nutrition scientists experience two dilemmas: first, between their aspiration to make a collective impact on public health and the powerful incentives of each to appear frequently in the media with new messages; second, between their need to cooperate with the food industry for financial reasons and their fear that this may compromise their independence and scientific integrity. It is argued that the dilemmas identified in this study should be dealt with openly by the relevant groups of scientists.  相似文献   

Searching for the public: school funding and shifting meanings of ‘the public’ in Australian education     

Jessica Gerrard  Glenn C. Savage  Kate O’Connor 《教育政策杂志》2017,32(4):503-519

School funding is a principal site of policy reform and contestation in the context of broad global shifts towards private- and market-based funding models. These shifts are transforming not only how schools are funded but also the meanings and practices of public education: that is, shifts in what is ‘public’ about schooling. In this paper, we examine the ways in which different articulations of ‘the public’ are brought to bear in contemporary debates surrounding school funding. Taking the Australian Review of Funding for Schooling (the Gonski Report) as our case, we analyse the policy report and its subsequent media coverage to consider what meanings are made concerning the ‘publicness’ of schooling. Our analysis reveals three broad themes of debate in the report and related media coverage: (1) the primacy of ‘procedural politics’ (i.e. the political imperatives and processes associated with public policy negotiations in the Australian federation); (2) changing relations between what is considered public and private; and (3) a connection of government schooling to concerns surrounding equity and a ‘public in need’. We suggest these three themes contour the debates and understandings that surround the ‘publicness’ of education generally, and school funding more specifically.  相似文献   

The interest of Bavarian primary school pupils in geographical topics and methods – selected results of an empirical survey     

Aline Lorenz  Anna Roth  Carolin Priese  Eva Peukert  Stefanie Mertel  Susanne Bloß 《Education 3-13》2017,45(5):543-557

Interest is a central learning prerequisite for teaching. The article deals with a survey among 1600 primary school pupils in forms 2, 3 and 4 (ages 7–10) in the German federal state of Bavaria who were interviewed on their interest in geographical topics and working methods. They were given a questionnaire including 40 items to indicate their individual interest on a five-point Likert scale. The results show that the subscale ‘natural disaster' generates the highest interest, followed by ‘phenomena of geoscience' and ‘people and peoples'. The interest in all three subscales decreases with increasing age. Furthermore, several gender-specific differences occur. Among the working methods, experimenting, films and computers hold the first three places whilst again showing significant differences concerning age group as well as gender.  相似文献