我国旅游业研发总体水平、区域分布与政策建议

本文利用文献法和定量分析等方法,深入分析了我国旅游业技术和研发现状。针对我国旅游业研发总体水平低,研发能力集中于发达地区等问题,从观念、政府、机构、人才等方面提出了具体政策建议。     

Effects of Geometrical Features on the Seismic Response of Historical Masonry Towers

ABSTRACT

Historical masonry structures are often located in earthquake-prone regions and the majority of them are considered to be seismically vulnerable and unsafe. Historical masonry towers are slender structures that exhibit unique architectural features and may present many inadequacies in terms of seismic performance. The seismic protection of such typologies of structures and the design of effective retrofitting interventions require a deep understanding of their behavior under horizontal loads. This paper presents the results of the seismic performance evaluation of historical masonry towers located in Northern Italy. A large set of case studies is considered, comprising a significant number of towers with high slenderness and marked inclination. First, a preliminary assessment of the dynamic behavior of the different towers is carried out through eigenfrequency analyses. Then, non-linear dynamic simulations are performed using a real accelerogram with different peak ground accelerations. A damage plasticity material model, exhibiting softening in both tension and compression, is adopted for masonry. The huge amount of results obtained from the non-linear dynamic simulations allows a comparative analysis of the towers to be performed in order to assess their seismic vulnerability and to show the dependence of their structural behavior on some geometrical characteristics, such as slenderness, inclination, and presence of openings and belfry. The evaluation of different response parameters and the examination of tensile damage distributions show the high vulnerability of historical masonry towers under horizontal loads, mainly in the presence of marked inclination and high slenderness. Some general trends of the seismic behavior of the towers are deduced as a function of the main typological features.     

First evidence of the production of Ginalski E5 button spurs from copper alloy in Central Europe

Ginalski-type E5 button spurs made from a Cu alloy are a characteristic attribute of the Middle Roman period in barbarian Europe. The find of part of a mould made of non-ferrous metal at the Luleč site in the district of Vyškov, Czech Republic, provided key evidence for explaining the issue of their production. The discovery of this unique artefact showed that based on current knowledge, the spurs made from a Cu alloy were also produced in the Middle Danube region and not only in Northeast Europe as had previously been thought.     

浅谈3D打印技术在陶瓷类文物修复和复制中的应用

3D打印技术已在多领域证明其高效性以及便捷性,成为社会热点。由于3D打印带有非接触式扫描的特点,这对于文物修复工作者而言,是在复制和修复过程中,为保护材质脆弱、价值珍贵的陶瓷类文物的可引进的新手段。在简单介绍3D打印技术复制陶器的主要过程之后,通过实例细致地了解每一个具体步骤,分析液化打印、粉末打印等不同打印技术的优缺点,如何在不同需求下进行选择;并且介绍在得到3D打印复制件后,通过复制件表面上色、纹饰加工处理等步骤完成整个复制品。3D打印技术不仅可被运用于文物复制,而且能以其与传统修复手法相比之下的无损、快速、精确等特点,在文物修复中发挥作用。     

ORTHOIMAGE‐BASED DOCUMENTATION OF ARCHAEOLOGICAL STRUCTURES: THE CASE OF A MEDIAEVAL WALL IN PONTEVEDRA,SPAIN

During the completion of the expansion works at the Museum of Pontevedra (Spain), a stretch of about 60 m of the medieval walled enclosure surrounding the historic city centre was discovered. Due to its value as a heritage element, the discovery of this archaeological structure required the implementation of preservation activities and exhaustive documentation so that future generations will be able to know and enjoy this piece of history. This paper presents digital models that reproduce the original structure of the wall using close‐range digital photogrammetry, as well as orthophotos, which thoroughly document the dimensional and textural characteristics of the archaeological site. In addition to analysing the accuracy and validity of photogrammetry in the conservation of archaeological heritage, a methodology of data capture, processing and photogrammetry representation is evaluated.     

J.W. Burrow: A personal history

The late John Burrow, one of the most stimulating promoters of the distinctively interdisciplinary enterprise that is Intellectual History, was a vital member of what has become known as the ‘Sussex School’. In exploring the resonances of his singular and richly idiosyncratic contribution, this article places his unique historical sensibility within a series of interpretative contexts, demonstrating the vitality of writings that will continue to inspire and inform scholarship in the field for decades to come.     

Combining photogrammetry and laser scanning for the recording and modelling of the Late Intermediate Period site of Pinchango Alto,Palpa, Peru

This paper describes the 3D modelling of Pinchango Alto, Peru, based on a combination of image and range data. Digital photogrammetry and laser scanning allow archaeological sites to be recorded efficiently and in detail even under unfavourable conditions. In 2004 we documented Pinchango Alto, a typical site of the hitherto poorly studied Late Intermediate Period on the south coast of Peru, with the aim of conducting spatial archaeological analyses at different scales. The combined use of a mini helicopter and a terrestrial laser scanner, both equipped with a camera, allowed a fast yet accurate recording of the site and its stone architecture. In this paper we describe the research background, the 3D modelling based on different image and range data sets, and the resulting products that will serve as a basis for archaeological analysis.     

H. L. Hunley Revealed: documentation,deconcretion, and recent developments in the investigation of an American Civil War submarine from 1864

Since 2014, the conservation staff at Clemson University's Warren Lasch Conservation Center in Charleston, South Carolina have been removing the concretion from the hull of H. L. Hunley, an American Civil War submarine lost 1864. In parallel, the archaeological team has been documenting the condition of the hull, the concretion layers, and the hull features revealed by the deconcretion process. This involved photography, direct measurements, and 3D scanning. This article will discuss the strategy for recording the concretion, the techniques used to document the newly revealed hull and its unique features, and the preliminary analysis of their archaeological significance.