故宫藏清代挂屏镶嵌玻璃饰件的科学分析

清代镶嵌器物数量巨大且种类繁多,玻璃是其中一种重要的镶嵌材料。为探讨清代镶嵌玻璃饰件的成分特征和加工工艺,本工作采用微区X射线荧光能谱、扫描电子显微镜、显微共聚焦拉曼光谱、激光诱导击穿光谱等方法,对故宫馆藏清代紫檀木边嵌玉石楼阁挂屏上的6件镶嵌玻璃饰件进行了初步分析,结果表明:6件玻璃饰件属于K₂O-CaO-SiO₂体系,以石英岩引入SiO₂作玻璃基体,硝石作助熔剂引入K₂O,CaO有方解石和萤石两个主要来源;深蓝色玻璃着色元素为钴,浅蓝色玻璃着色元素为铜,蓝绿色玻璃为铜和铁共同着色,4件玻璃饰件乳浊剂均为CaF₂;黄色玻璃以铅锡黄为着色剂并乳浊剂。通过显微形貌观察结合档案记载,认为镶嵌玻璃饰件是在熔制好的玻璃块上经过二次加工而成,加工工艺采用了中国古代传统的治玉工艺。研究结果可为清代镶嵌工艺及玻璃制作工艺的研究提供佐证。     

Thin-folded Shell for the Renewal of Existing Wooden Roofs

In this article, a technique for the renewal of historic building wooden roofs is presented. The solution can be used for the strengthening of existing wooden roofs against excessive lateral thrusts on the peripheral wall or for the recovery of the attics, as it allows removing the existing structural elements, such as possible wooden truss-works of no artistic value. With minor adaptations, the solution can be addressed to enhance the building seismic performance. The technique is minimally impairing on existing buildings and can be applied also in new constructions.

The technique is based on the construction of a thin folded shell, overlaying the existing pitches. Emphasis is given to lightweight folded shells, obtained by overlaying thin plywood panels on the existing roof rafters and planks, without modifying the overall architectural layout.

The technique conceptual design is discussed and a simplified analytical method is proposed, which allows for the clarification of the role of each structural component and can be adopted for the folded shell proportioning and design. The analytical results are validated against numerical results obtained with reference to some case studies. Ultimately, emphasis is given to the detailing, whose correct execution is mandatory for the success of the proposed structural intervention.     

Archaeometric Investigation of Medieval Pottery from Excavations at Novo Brdo,Serbia

Medieval pottery from excavations at Novo Brdo, Serbia, an important mining and trading centre during the 14th and 15th centuries, was investigated by a combination of optical microscopy, inductively coupled plasma – optical emission spectrometry, Fourier transform infrared, micro‐Raman and energy‐dispersive X‐ray fluorescence spectroscopy and X‐ray powder diffraction methods in order to determine its composition and firing temperature. The samples investigated were made of medium‐ to coarse‐grained, non‐calcareous clay, by a relatively well‐controlled firing procedure in an oxidizing atmosphere. The firing temperature was estimated to be 850–950°C. The similarity between the chemical composition of the investigated pottery and the local raw clay, combined with the outward appearance and the archaeological findings, indicate domestic production. The pottery is covered with the transparent lead‐rich glaze. Iron and copper were used as colourants.     

Teaching energy geographies via videography

In our digital age of information acquisition, multimedia information streams are constant, constantly changing and often contain multiple messages about topics important to everyday life, such as energy geographies. Recognizing that college students are prime consumers of digital information, it seems that crafting of academic engagement for and with students that is in touch with the knowledge networks they utilize and will continue to be part of today and into the future is important. Engaging students in the production of videos about important topics, such as energy geographies, aids them in becoming critical producers of knowledge.     

唐代宝花狮纹锦织物的特点和复制

通过分析唐代宝花狮纹锦各项参数,确定它须由大花偻束综提花机制织,据此复原出这项织造技术．并成功复制出宝花狮纹锦。从而可以推断,随着丝绸之路的畅通,唐代中西方商品、文化、技术交流紧密,大花楼束综提花技术已经开始应用,以此为基础．丝绸品种从以前的经锦过渡剑纬锦,织物图案的艺术表现力得以增强．提花织机的生产效率也得到提高。     

HINTS ABOUT SITE AMPLIFICATION EFFECTS COMPARING MACROSEISMIC HAZARD ESTIMATE WITH MICROTREMOR MEASUREMENTS: THE AGRI VALLEY (ITALY) EXAMPLE

We approach from a new standpoint the problem of estimating seismic hazard for some towns and villages located in Val d'Agri area (Southern Italy) that in the past have been affected by several seismic events. The estimates are carried out using a method that is based on the analysis of site seismic history extracted from macroseismic catalogues. To study the influence of site effects two different procedures have been performed: in the first, seismic hazard estimates have been deduced from epicentral data only, in the second, intensity data actually observed at the site are also considered. The difference between the two estimates can be correlated with local variations of seismic response due to local geological features which are responsible for possible cases of amplification. In order to validate the presence of such correlation, seismic hazard estimates have been compared to site amplification measurements obtained by using the HVSR (Horizontal to Vertical Spectral Ratio) technique. Our findings reveal a good correlation between seismic hazard enhancements and the presence of site amplification effects. The application of this kind of analysis to the Val d'Agri area has pointed out that the joint estimates of site seismic hazard enhancement and HVSR measurements could be a helpful tool to identify problems related to seismic microzonation.     

关于加快青海生态畜牧业发展的思考

在实现科学发展,建设生态文明的大背景下,如何实现畜牧业可持续发展与草地生态保护相协调,既减轻草场压力又提高畜牧业经济效益,最终实现牧民增收与生态保护的双赢,是摆在我们面前需要解决的一项紧迫任务。本文从分析青海省草地畜牧业发展现状及存在问题入手,指出当前制约畜牧业发展根源在于落后的生产经营方式,并结合正在开展的生态畜牧业建设试点工作,提出了青海省发展生态畜牧业的思路和政策措施。     

欧洲文物保护技术规范述评

欧洲文物保护标准化技术委员会(欧盟文标委)是欧洲标准委员会(CEN)下设的一个专业技术委员会,目的是为欧洲地区制定一个协调统一的文物保护方法体系,同时为欧洲各国文物保护的科学化和规范化提供技术保障。欧盟文标委由5个专家组组成,分别开展15个类别的文物保护标准的起草工作,并与相关国际组织积极合作,其标准的制定过程科学规范,工作程序严谨,标准内容符合时代发展的需求,为世界各国的文物保护行业提供了典范。     

Das Wissen der Schulden. Recht,Kulturtechnik und Alltagserfahrung im liberalen Kapitalismus

The Knowledge of Debt: Law, Media Technique, and Everyday Experience in Liberal Capitalism. Performing an object such as ‘the economy’ hinges on practices of formatting knowledge. The article proposes to look at such instituting moments in connection with social conflicts over the legitimate rules of exchange. This is exemplified by way of recounting the story of the codification of Swiss bankruptcy law in 1889. In order to homogenize the legal procedures of debt collection and bankruptcy, two subject categories were instituted: ‘merchants’ and ‘non-merchants’. These different categories were thought to account for the diverging temporalities and spaces of credit exchange in everyday economic life. The introduction of the commercial register, a media-technical apparatus, enabled a formal distinction between ‘merchants’ and ‘non-merchants’. However, this boundary was contested and proved to be porose.