龙门石窟万佛洞观世音菩萨像虚拟修复研究和实践

龙门石窟万佛洞前室南壁唐代观世音菩萨像,因其精湛的雕刻技艺、典雅婀娜的造型,被誉为“龙门最美观世音”。受人为及自然双重因素的影响,造像面部残缺,彩绘消失殆尽。对其进行虚拟修复,重现其完整样貌,对考古科研和展示利用具有重要意义。以史料照片为依据,采用三维数字化与雕塑修补相结合的技术方法,实现残损造像形体和石质质感的虚拟修复,并通过高精度SLA 3D打印的方式输出虚拟修复的实体模型。利用XRF光谱分析、拉曼光谱分析技术,测定了该造像残存颜料的成分。在此基础上,依据残存颜料的分布情况和龙门同期造像的色彩风格,完成残损观世音菩萨像的色彩虚拟修复。此科研实践设计了对残损文物形体和色彩虚拟修复的完整技术路径,验证了所选技术路线的可行性,并实现了实体模型的妆銮赋色和在展览展示中的利用。     

近代以来国家恐怖主义的特点及构成要素

国家恐怖主义是由政府实施的恐怖主义,法西斯主义则是国家恐怖主义发展到登峰造极的产物.国家恐怖主义具有制度化、公开性和社会化的特点,并具有独裁政治,庞大的镇压机器,镇压性的特务机关,非人道的人身迫害,非战争状态下对大量人口的集体收监、屠杀或迫使其流亡,针对社会知名人士的暴力行为等构成要素.     

“It was amazing to see our projects come to life!” Developing affective learning during geography fieldwork through tropophilia

This research, conducted with groups of undergraduate students before and after a European fieldwork exercise, critically examines the pedagogic value of fieldwork and its ability to provide students with transferable skills. This is achieved using Anderson and Erskine’s lens of tropophilia – the aesthetic connection between people and place – to explore the influence of “being” in the field upon affective learning. In doing so, this research suggests (1) that encouraging students to recognize how their own affective skills may influence the types of knowledge(s) that are produced on fieldtrips and (2) that people-place connections have the ability to inspire students to become more self-reflexive about their position(s) as learners.     

辽宁省城市中心性研究与城市发展

以辽宁省地级及以上城市为研究对象,在建立评价指标体系基础上,基于区位商法和主成分分析法,对城市中心性进行了测度和研究。通过对过程数据和结果数据的进一步分析,发现辽宁省当前城市发展在区域经济空间结构、社会经济体制、第三产业、经济外向度等方面存在的问题,并提出了相关的政策建议。     

黑河流域居民生活质量研究

以《Calvert-Henderson生活质量指标》一书为理论指导构建了生活质量评价指标体系,通过开展生活质量问卷调查及查找相关统计资料,运用主成分分析法确定指标的权重,研究了我国西北地区第二大内陆河流域-黑河流域城乡居民2004年的生活质量。具体的评价结果是:黑河流域城镇居民生活质量明显高于农村;黑河流域城市居民生活质量表现出中游高于上游和下游;黑河流域农村居民生活质量以乡镇为单位计算差异显著;黑河流域农村居民生活质量中游略好于上游、下游;影响黑河流域城乡居民生活质量的主要因素是收入、教育和住房。     

PROCEDURE AND SPECTRA FOR ANALYSIS OF RC STRUCTURES SUBJECTED TO STRONG VERTICAL EARTHQUAKE LOADS

Abstract

In view of the compendium of field evidence and supporting analysis work indicating the possible damaging effects of vertical earthquake ground motion, this paper addresses the problem of code-type vertical force calculation. In light of recent engineering seismology studies of the relationship between vertical and horizontal peak ground acceleration, the inadequacy of the 2/3-rule depicted by codes is highlighted. A simple piece-wise linear relationship is proposed and shown to represent existing strong-motion measurements adequately. Bilinear and inelastic spectra are derived and studied. It is demonstrated that net tensile forces and displacements may ensue, thus eroding the shear resistance of RC columns. A simple procedure is outlined whereby modal analysis may be employed to estimate conservatively vertical earthquake forces on buildings. Finally, areas of further exploration and refinement are identified.     

Chemical and Microscopic Study of Masonry Mortar in Ancient Pagodas in East China

Ancient mortars played a crucial role in the construction of historical architectures due to their physical and chemical compatibility with traditional building materials such as stones and bricks. Therefore, the analysis and optimization of the ancient mortar formula are significant in the restoration and preservation of historical sites. In this work, 20 mortar samples selected from five ancient stone pagodas in Zhejiang Province, China, were analyzed. The results showed that mud, lime-soil mortar, lime-sand mortar, and lime-gypsum mortar were used as binders in these pagodas. The Ca(OH)₂/aggregate ratio ranging from 0.3 to 2.7 was usually used to prepare lime mortar. Protein and polysaccharide were also found in some samples.