A practical approach to making accurate 3D layouts of interesting cultural heritage sites through digital models

On many occasions, the graphic information handled by people working in the cultural heritage sector is still bidimensional. Layouts showing elevations and cross sections are the most widespread tools. However, there is an increased need for carefully detailing the complexity of valuable sites with an improved accuracy. This implies the measuring and handling of three-dimensional data, using both commercial and turn-key hardware and software solutions. Taking the usual traditional process as a reference, in the present paper a new effective methodology for carrying out computer assisted delineation of layouts from cultural heritage sites, using 3D digital models, is described. The proposed procedure has been tested in five intervention projects on representative churches within the “Merindad de Aguilar de Campoo” medieval area, in the north of Spain.¹ This area has the largest collection of Romanesque art in the world, and is currently under European Heritage Site and World Heritage Site declaration process by the UNESCO.     

Effect of the addition of hydroxyl-terminated polydimethylsiloxane to TEOS-based stone consolidants

Hybrid stone consolidants prepared from tetraethoxysilane (TEOS) and α,ω-hydroxyl-terminated polydimethylsiloxane (PDMS-OH) have been considered as one of the most promising approaches to improve the effectiveness of traditional alkoxysilane-based formulations. They have emerged as response to the negative reports commonly found in the literature: the resulting silica gel phase (SiO₂) tends to develop fractures and fissures inside the stone as the gel shrinks during the drying stage. In this work, we employed SEM, solid-state ²⁹Si NMR spectroscopy and compressive tests to characterize SiO₂-PDMS hybrid gels. We report the morphological characteristics exhibited by gels prepared in vitro and in situ. It was found an appreciable reduction of gel fracture for hybrids prepared from 5% w/w of PDMS. As TEOS polycondenses, PDMS-OH is chemically incorporated into the gel matrix via Si-O-Si bonds. The inclusion of these elastic chains provides the necessary flexibility to resist the stress imposed by capillary pressure. Additionally, an important hydrophobic character is imparted to the stone.     

二手房市场:现状·问题·对策

随着房产市场的快速发展。全国房产“涨”声一片,主观上的市场经济不够完善、市场信息不够对称、市场主体行为不够规范以及客观上土地的稀缺、消费者对房产的投机行为、地方政府的变相鼓励,使得房产市场泡沫现象逐渐凸现并发展起来,造成房价飞涨,而人们购买力的相对下降,开发商处于永恒的利润最大化,都使得住房一级市场供需失衡,从而使越来越多的关注投入到了房产的二级市场,通过积极挖掘二手房市场的巨大潜力来满足住房主体的住房需求。     

Sprinting analysis of elite soccer players during European Champions League and UEFA Cup matches

It has been suggested that assessment of high-intensity activities during a match is a valid measure of physical performance in elite soccer. Recently, sprinting activities have been analysed in more depth. The aim of this study was to develop a detailed analysis of the sprinting activities of different playing positions during European Champions League and UEFA Cup competitions. Altogether, 717 elite outfield soccer players were evaluated throughout 2002-2006 using ProZone? (Leeds, UK). Sprinting (explosive and leading) was analysed for each playing position. To compare positional differences, a Kruskal-Wallis analysis was performed. Differences were found among positions for total number of sprints and total sprint distance covered: wide midfielders > (attackers = wide defenders) > central midfielders > central defenders (P < 0.001), as well as for explosive sprints: (wide midfielders = attackers = wide defenders) > central defenders, wide midfielders > central midfielders > central defenders and attackers = wide defenders = central midfielders (P < 0.001), and leading sprints: wide midfielders > (attackers = wide defenders) > central midfielders > central defenders (P < 0.001). For each group, there were no differences in ratio of explosive to leading sprints. Wide midfielders performed a higher number of sprints in all five distance categories than all other positions. This study showed that sprinting characteristics are influenced by position. Wide midfielders have to complete additional high-intensity activities during training sessions compared with the other positions to achieve the performance level required during the match.     

Integrating educational institutions to produce intellectual capital for sustainability in Caguas,Puerto Rico

This research is part of a broader investigation to analyse the processes followed by the Caguas Municipality at the Commonwealth of Puerto Rico in an effort to develop the characteristics of a ‘Smart City’ as an example of sustainable development. We describe the integration of the educational institutions’ initiatives and the municipal government strategic plan to contribute to the knowledge and intellectual capital that brings sustainability to the city. An actor's model was designed to represent this integration. The conceptual framework was based on the concepts of knowledge production and sharing as applied to the collaboration between critical representative actors. Field research consisting of in-depth interviews was performed to ascertain the integration processes and their relationship with such processes of knowledge production and sharing. The results showed that the governance paradigm implemented is already empowering the citizens to contribute with intellectual capital that brings sustainability to Caguas.     

The presentation of gas properties in chemistry textbooks and as reported by science teachers

The presentation of gas properties in terms of the qualitative–quantitative mode and gas law sequence is examined by means of an analysis of 14 chemistry textbooks used in Australian secondary schools and of questionnaires on teaching approaches completed by 104 secondary science teachers. The findings indicate that current pedagogic practice involves minimal use of the qualitative relationships of the gas laws and moderate use of a simple-to-complex sequence. Given the conceptual complexity of the gas laws, the authors support a presentation approach with increased use of qualitative exercises and, in the initial stage at least, the use of a complex-to-simple model where the interrelationships among the gas laws are easier to establish.     

图书情报学校的新思路

本文是布德为新泽西州图书馆协会作的演讲。它从贮存和检索信息的新技术对图书情报工作和图书情报教育的影响,分析图书情报教育的情况、不足和出路,提出要进行重要的变革。     

试论中国人民广播事业六十年的历史经验

江泽民同志在2000年12月25日为中国人民广播事业暨中央人民广播电台创建60周年作了重要批示: “在中国人民广播事业暨中央人民广播电台创建60周年之际,我向全国广播战线的同志们致以亲切的问候！ 广播事业是党的新闻事业的重要组成部分。60年来,中央人民广播电台为宣传党的路线方针政策,弘扬中华民族精神,弘扬爱国主义、集体主义、社会     

社会转型期我国体育产业发展研究

阐述了社会转型的内涵及体育存在方式的转变,着重从经济学角度分析了社会转型期我国体育产业所具有的正外部性、高弹性、带动效应等特点,并根据这些特点提出相应的发展对策:实施补贴,将外部性的结果内部化,完善体育资源配置市场,实现梯度式发展,利用经济循环,合理加大投入,节约利用资源。