Confocal XRF depth profiling non-destructively reveals the original blue pigments in a Renaissance painting by Caroto     

Myriam Eveno  Erin Mysak  Katharina Müller  Gilles Bastian  Nathalie Pincas  Ina Reiche 《文物保护研究》2016,61(2):102-112

Recent restoration of The Rest on the Flight into Egypt by Giovanni Francesco Caroto, from the Louvre collections, included a technical examination of the Virgin's blue robe that aimed to characterize the original materials and later additions. The painting was examined using light microscopy and ultraviolet and infrared imaging, and one cross section was taken. None of these methods showed a clear distinction between the layers that were artist applied or modifications made by another hand. To gain information about the paint stratigraphy without taking additional samples, non-invasive confocal X-ray fluorescence (CXRF) analysis was carried out to examine several areas of the Virgin's robe. Using this technique, it was possible to identify the pigments and order of application of paint by the artist. All the pigments identified were considered to be artist applied, and on this basis no further cleaning was carried out and conservation proceeded with retouching of minor areas of loss or damage. This study highlights the advantages of CXRF analysis for the technical study of paintings, used in combination with classical methods for making informed conservation treatment decisions.  相似文献   

Information Seeking Behavior of Older Adults     

Susan Stanziano 《期刊图书馆员》2016,71(3-4):221-230

We live in a world where more and more the availability of needed information is determined by access to technology. This presents a barrier for some segments of the population. Older adults use various methods to acquire the information they need. Some of these methods lead to untrusted or unreliable results. The most important area where information validity is crucial is where there are health and health-related concerns. The playing field is not level, however, in the search for information since factors such as literacy, computer literacy, mobility, dexterity and others all play a part in successful information seeking results.  相似文献   

钢架节点连接螺栓的代换及质量监督     

殷春涛  顾如兰 《泰州职业技术学院学报》2003,3(5):51-54

从螺栓外形尺寸及材料力学性能等方面阐述ASTMA325结构螺栓用大六角头高强螺栓(GB1228—91规范规定)代用的依据；论述两种螺栓在抗剪连接设计及施工要求方面的不同；介绍代换后质量监督控制要点。  相似文献   

Synthesis and Characterization of Modified Epoxy Resins by Silicic Acid Tetraethyl Ester and Nano-SiO2     

李海燕  张之圣 《天津大学学报(英文版)》2004,10(2):105-108

A kind of modified epoxy resins was obtained by condensation of epoxy resin with silicic acid tetraethyl ester(TEOS) and nano-SiO2. The reactions were performed with hydrochloric acid as a catalyst at 63℃. The structure, thermal stability and morphological characteristics of the modified epoxy resins were studied through infrared spectra (FF-IR) analysis, thermogravimetric (TG) analysis and scanning electron microscopy respectively. It has been found from the IR and TG study that modified epoxy resins have greater thermal stability than epoxy resins, and its thermal stability has been improved by the formation of inter-crosslinked network structure. The modified epoxy resins exhibit heterogeneous morphology and heterogeneity increases with more TEOS feeding, which in turn confirms the formation of inter-crosslinked network structure in modified epoxy resins.  相似文献   

试述改善IR的药物的研发情况     

王红江  李香君 《黑龙江科技信息》2009,(34):296-296,308

针对改善IR的药物的研究情况进行了阐述.  相似文献   

浅谈超宽带无线技术UWB     

曹荣 《黑龙江科技信息》2008,(31)

通过与现有无线通信技术之间的比较,引入超宽带无线技术UWB技术,全面介绍了UWB的发展历程、技术特点、标准,UWB信号的产生和调制、传播方式、接受方式,并且介绍了目前UWB系统的限制、应用和发展前景.  相似文献   

牛磺酸双核铜配合物的红外及热分解机理分析     

蔡金华 《河池学院学报》2005,25(5):21-23

牛磺酸是生物体内具有独特生物活性的氨基酸,它的配合物目前已得到系统的研究和应用,在溶剂热条件下合成了牛磺酸的双核铜配合物[Cu2（C10H8N2）2（C2H6NSO3）2（ClO4）2].通过热重和红外分析,研究了它的热分解机理.TG-DTG曲线表明配合物经两个分解阶段最后分解氧化成氧化铜.  相似文献   

本体在跨语言信息检索中的应用机制研究   总被引：3，自引：1，他引：2  

吴丹  王惠临 《图书情报工作》2006,50(9):10-13

解释多语本体的含义,指出其在不同语言中所对应的领域知识,分析多语本体在查询扩展、语义标注、基于概念索引3方面对改善跨语言信息检索的作用,并通过介绍EuroWorldNet和Cindor系统的多语本体概念的对应方法,探讨本体应用于跨语言信息检索最关键的多语本体库的映射方法,认为采用中间语言作为概念表示、并通过词典翻译对照与不同语种的词汇建立链接关系是多语本体映射的一种良好方法。  相似文献   

杂化方式对化合物性质的影响     

吴刚  王小锋  冯建华  陈昌云 《南京晓庄学院学报》2013,(3):122-124

文章阐述了杂化方式对化合物结构和性质的影响,讨论了杂化方式如何影响化学键的键长、化合物的酸碱性、对红外光谱和其它性质的影响.  相似文献   

大学机构知识库建设探析     

杨长平  吴登俊  郭晓彬 《四川图书馆学报》2012,(3):40-42

通过对机构知识库发展现状、定义的理解,探讨了影响机构知识库建设的主要环节,以期为我国高校机构知识库的建设提供参考。  相似文献