排序方式： 共有74条查询结果，搜索用时 328 毫秒
1.
ABSTRACTThe preservation of artefacts in museum collections is profoundly affected by fluctuations in temperature and, especially, relative humidity (RH). Since the late nineteenth century, many studies have been carried out on the best way to control hygrothermal conditions. In old buildings located in maritime temperate climate zones (such as Portugal) with strong thermal inertia, and which have low ventilation rate (relative to the volume and number of visitors), daily and seasonal hygroscopic inertia may help to assure the maintenance of RH stabilization conditions. The use of expensive active systems may be minimized through the passive behaviour of internal finishing building materials. This work presents the results of an experimental laboratory study conducted in a flow chamber to demonstrate the enormous potential of hygroscopic materials in stabilizing interior relative humidity. Based in these results and in-situ monitoring in a museum housed in a building, located in Porto, with a typical construction of the 1950s (granite masonry and reinforced concrete slabs), a numerical analysis was done to quantify the influence of hygroscopic materials in stabilizing the interior relative humidity. 相似文献
2.
3.
4.
5.
6.
7.
Elizabeth de Freitas 《Educational Studies in Mathematics》2016,91(2):185-202
This paper contributes to research on the material dimensions of teaching and learning mathematics, arguing that perception is not sensory integration or synthesis of multi-modal information, but rather a speculative investment in specific material encounters. This approach entails sociopolitical consequences for how we work with dis/ability in mathematics classrooms because it foregrounds how the relationship between sense (as meaning) and sense (as sensation) can be fundamentally altered. I focus on how visual perception in mathematics can be reconceived in these terms, drawing principally on the philosophical insights of Michel Serres and Brian Massumi. This paper shows how philosophical work on perception can shed light on embodied mathematics, opening up discussion about the potentiality of the human body. 相似文献
8.
ABSTRACTChildren and animals of all kinds are said to develop some degree of number sense. The search for ‘number neurons’ and neural correlates of computational thinking aims to identify biological primitives to explain the emergence of number sense. This work typically looks for the sources of number sense in organisms, but one might extend this search and study the possibility of a calculating matter more generally. Such a speculative project explores the implications of the non-human turn within the posthumanities. In this paper, I draw primarily on the work of Vicky Kirby and Gilles Deleuze in order to focus on becoming-monster through calculation. I show how calculation, as a machinic and empirical act that both serves and troubles images of mathematical truth, has always played a unique role in the production of mathematical monsters. I then discuss calculating children who participate in abacus clubs and annual abacus competitions, calculating at inhuman rates with imaginary abacuses. I argue that a new materialist philosophy of immanence demands a radically new approach to number sense. 相似文献
9.
10.
聂军 《中国现代教育装备》2009,(1):44-46
数据库系统是计算机信息系统的核心部件,数据库系统所管理、存储的数据是各个部门宝贵的信息资源,担负着存储和管理数据信息的任务,其安全性将是信息安全的重申之重。良好的数据库的安全性设计,可以有效地保护数据库,防止不合法的访问和破坏。本文主要探讨了数据库系统面临的安全问题。 相似文献