Methods and tools for the classification and cataloging of antique moulds from the collection of the Richard-Ginori factory     

《Journal of Cultural Heritage》2014,15(5):479-489

This study proposes a procedure for digitally classifying and cataloging moulds which belong to the historic collection of the Ginori porcelain factory in Doccia (Sesto Fiorentino, Italy). In addition to a vast number of antique plaster moulds, this collection includes artistic porcelain artifacts obtained from casting porcelain using the moulds and models made of various materials. The proposed methodology includes two workflows: the first starts with photographic and casting processes conducted recently on various groups of moulds and involves historical surveys for investigating the relationships between the various sets of moulds, the models from which they were derived and the porcelain objects derived from them. The second workflow was applied when no information was available for a set of moulds, and involved 3D scanning of the moulds, with virtual reconstruction of the corresponding model followed by a final art historical survey like that used in the first procedure. 3D scanning techniques and successive model reconstruction can also be applied for obtaining a virtual model in the first process, when the physical model was lost, damaged or never existed. The variety and extent of the Ginori collection suggested the use of a customized Data-Base (DB) and a set of functions designed to manage and extract information, data and archived images. This filing system, called DocciaDigitalArchive (DDA), also makes it possible to specify the relationships between the different typology samples (prototype models, moulds derived from them, handmade porcelain objects produced from these moulds), which are associated when the same subject is portrayed. The DB structure conceived also provides the possibility of incorporating pictures and data of known archetypes. This additional information makes it possible to place each subject in its historical and artistic context. For each sample filed in the DDA system, documentary cards, which summarize data, images, reports and links to other entities or samples connected to the subject consulted, can be viewed on a suitable interface.  相似文献   

Using 3D digital models for the virtual restoration of polychrome in interesting cultural sites     

《Journal of Cultural Heritage》2014,15(2):196-198

In most cases, the polychrome paintings that decorated heritage buildings no longer exist or are reduced to mere remnants. These facts decontextualize the sites in their historical and artistic evolution, distort the intention under which they were conceived, and hamper their accomplishment. Current recovery methods are restricted to the stabilization of the remains in their present status, requiring a lot of completely manual work that is expensive and almost unrelated to the use of new technologies. Three-dimensional digitalization and modelling is proved to be the basis for the virtual recovery of paintings in a significant edifice. To do so, an innovative methodology is presented that allows the 3D geometric information of a site (captured using a laser scanner) to be combined with specially designed 2D artistic images. The resulting 3D digital models can then be focused, with high efficiency projectors, on the equivalent area of the original site, and also used as raw material to compose a video-projection without perspective effects to emulate, with due rigour, the primitive appearance, its evolution along time, the effects of the deterioration, or other interesting aspects. The results obtained at Sta. María de Mave (Palencia, Spain) are presented, supporting the potential of this new methodology not only as a scientific way to discuss possible restoration hypotheses with experts or as a didactic tool for narrating the historical evolution of a monument, but also as a spectacular show for tourists.  相似文献   

Spatial collocation and venture capital in the US biotechnology industry   总被引：1，自引：0，他引：1  

Christos KolympirisNicholas Kalaitzandonakes  Douglas Miller 《Research Policy》2011,40(9):1188-1199

Biotechnology firms operate in a high-risk and high-reward environment and are in a constant race to secure venture capital (VC) funds. Previous contributions to the literature show that the VC firms tend to invest locally in order to monitor their investments and to provide operating assistance to their target firms. Further, biotechnology is a knowledge-based industry that tends to exhibit spatial clusters, and the firms in such industries may collocate to benefit from gaining access to local markets for specialized inputs (e.g., skilled researchers) and from local knowledge spillovers and network externalities. If such gains exist, we expect that the collocated firms should exhibit positively correlated performance, including in their ability to attract venture capital funds. The purpose of this paper is to empirically measure the strength and spatial extent of the relationships among the amount of funds raised by proximate biotechnology firms. We model these relationships with a spatial autoregression (SAR) model, and we control for characteristics of the biotechnology firms and the VC firms that provide their funds as well as site-specific factors. Based on our fitted SAR model, we find that the amount of venture capital raised by a particular biotechnology firm is significantly influenced by the number of VC firms and the VC funding levels raised by biotechnology firms located within a 10-mile radius, but these relationships are not statistically significant beyond this range.  相似文献   

基于3D视角的机遇发现路径图式与演化研究          下载免费PDF全文

蔡淑琴  肖泉  徐升华 《科研管理》2011,32(7):130-137

机遇发现近年来受到企业界和学术界越来越多的关注,本文在总结机遇发现相关文献基础上,阐述了机遇及其发现过程的需求、供给和运作三个核心维度并构建了机遇发现的DSO三维空间模型,研究了机遇发现的路径图式,对机遇发现路径演化的作用力进行了微观建模,通过分析机遇发现维度与决策的相互作用,建立了机遇发现路径演化机制模型,分析讨论了一个电信行业企业的机遇发现实例,最后对研究结论进行了总结并对今后的研究方向进行了展望。  相似文献   

浅析3G手机在校园信息化建设中的应用     

崔世林 《中国科技信息》2011,(8):107-107

2009年是中国3G元年,在这一年,我国三大移动通信运营商的3G网络将正式投入商用,中国移动通信领域也将随之步入3G时代。随之而来的是3G手机的大量普及,使人们的生活变得丰富多彩起来,可视电话、手机电视、高速上网、电话会议、刷卡支付成为了可能。  相似文献   

基于ActiViz.NET的脑纤维三维显示方法研究     

邵开来  周海波  张俊琪  李蓉  李悄然  倪开车 《科技通报》2011,27(5)

描述一种脑白质纤维三维重建显示方法。该方法采用DW-MRI数据,由Streamline纤维跟踪算法生成脑白质纤维节点数据:利用ActiViz.NET实现VTK(The Visualization Toolkit)在.Net平台上的调用,通过数据导入、映射、渲染、刷新显示等流程完成三维可视化显示。该方法实现基于.Net平台,利用C#语言完成所有代码编写。本方法实现的三维重建显示,功能强大、使用灵活,具有步骤清晰简单、效果好、速度快、交互能力强等优点,可以被广泛应用于脑医学图像的重建中。  相似文献   

数字铁路信息共享体系研究     

张毅 《中国科技信息》2011,(16):203-204

数字铁路的建设需要解决勘察设计、建设施工、运营养护三大阶段的信息共享、综合利用问题。通过分析数字铁路的主要研究内容及关键技术,阐述了数字铁路信息共享体系的构建,以及对建设数字铁路具有的重要指导意义。  相似文献   

利用改进威胁模型的电势理论的三维飞行路径规划     

刘丽峰  张树清 《中国科学院研究生院学报》2011,28(4)

用改进威胁模型规划后的电势理论划出实用的三维航迹.对有地形威胁和雷达、火力威胁的各种情况进行了分类、分析,并推出计算公式.通过限定搜索范围为包含起始点和目标点之间的矩形区域,不但减少了计算的复杂度,而且保证飞行路线收敛于目标点.用坡度限制平滑算法和用曲率限制平滑算法对上述航迹的法向加速度和曲率进行约束,得到符合飞行器机动性的飞行路线.  相似文献   

中热固相法Li1+xV3O8-yFy正极材料的制备及性能     

秦红莲  唐致远  马莉 《中国科学院研究生院学报》2011,28(4)

以Li2CO3和V2O5为原料,用中热固相法制备了掺杂不同氟离子含量的锂离子电池正极材料Li1+xV3O8-yFy,采用XRD衍射对其结构进行表征,并通过充放电测试、循环伏安及电导率测试对其性能进行了研究.测试结果表明,中热固相法制得的Li1+xV3O8-yFy产品较纯,没有杂质相存在;当y=0.1时产品的电化学循环性能最好,首次放电比容量达252.08 mAh/g,以0.2c倍率循环25次之后比容量仍保持在210.93 mAh/g,容量保持率达92.72％.  相似文献   

甲基丁烯醇的光电离实验与理论研究     

孙月  赵玉杰  方文正  孙金大  单晓斌  刘付轶  盛六四  王振亚 《中国科学院研究生院学报》2011,28(2)

利用同步辐射光电离质谱的方法研究了甲基丁烯醇(C5H10O)在9.0～15.5eV的真空紫外光电离和光解离过程.通过测量光电离效率曲线,得到了C5H10O的电离能和主要碎片离子的出现势.通过对实验和计算结果的比较,分析了母体离子可能的光电离解离机理.母体离子的解离通道可以分为2类:由C5H10O+直接发生键断裂的解离和经由过渡态的解离.确定了C4H 5+和C3H 5+离子的过渡态和中间体,其反应势垒与实验解离能是符合的.  相似文献