SIMULATION OF THE CYCLIC BEHAVIOUR OF R/C RECTANGULAR HOLLOW SECTION BRIDGE PIERS VIA A DETAILED NUMERICAL MODEL

In the search for robust constitutive models suitable for reproducing the performance of bridge piers during a seismic event, this paper details the simulation of the cyclic responses of four rectangular hollow section R/C bridge piers. These four R/C bridge piers were built at scale 1/2.5 and tested experimentally. Both tall and short piers are considered, covering situations where bending or shear are of relevance. Furthermore, the four piers were reinforced according to rather different design strategies: (I) the first is a 30-year-old bridge designed without allowance to the seismic action, and (ii) the second is a bridge fulfilling the EC8 provisions. The detailed constitutive model that provides the numerical predictions includes two submodels: one with two scalar damage variables, reproducing the tensile and compressive degradations of concrete, and the other is based on the Giuffre-Menegotto-Pinto formulation, simulating the cyclic behaviour of the re-inforcement. The Damage Mechanics submodel is implemented at the Gauss points of the finite elements that discretize the concrete, whereas the steel submodel is implemented on the 2-noded truss elements adopted for the rebars. A comparison between the numerical and the experimental results is discussed in detail in this paper.     

Corruption European Style: The 1861 Frémont Scandal and Popular Fears in the Civil War North

Union General John C. Frémont excited considerable controversy during the Civil War, and not just due to his dubious military competence and early advocacy of emancipation. Many republican‐influenced citizens suspected Frémont of the corrupt misuse of power, and undermining the essential moral basis of the republic. While ultimately his ineffectual generalship might have reassured Northerners that “the Pathfinder” was hardly likely to succeed in his suspected schemes, it is striking that even during the war for national survival, citizens remained deeply concerned with the possible threat of power (particularly in the hands of corrupt, designing men) to liberty.     

张廷玉《明史·太祖纪》至正十三、十四年史事辨析

明清史籍关于明太祖早期发家史中的一些重要历史事件,存在至正十三年和至正十四年两大叙述系统。前者主要依据于《明太祖实录》,后者主要依据于《明太祖文集》。经过考辨,至正十四年叙述意见才是符合历史事实的。张廷玉《明史》最终采纳的是至正十三年叙述意见,而舍弃了至正十四年叙述意见,从而造成了《明史.太祖纪》在至正十三年、十四年史事记载上存在不少失考之处,点校本亦未作出校勘案语。由此一例,亦可提醒研究者在从事元末明初历史研究时务必首先仔细辨别史料的真伪情况。     

Hemp in ancient rope and fabric from the Christmas Cave in Israel: talmudic background and DNA sequence identification

The “Christmas Cave”, a cave in the Qidron Valley near the Dead Sea and Qumran, has yielded a complex collection of plant-derived rope and fabric artifacts. Using polymerase chain reaction (PCR) to amplify DNA of the samples, we estimated the sizes and determined restriction patterns and base sequences of chloroplast genes, primarily rbcL (gene for the large subunit of ribulose bisphosphate carboxylase). DNA was successfully extracted from all samples, but was limited to sizes of approximately 200–300 base pairs. As expected, the DNA extracted from the samples was identified as coming primarily from flax (Linum usitatissamum L.), but two samples had a significant fraction, and all samples had at least a trace, of hemp (Cannabis sativa L.) DNA. Artifacts from the Christmas Cave were thought to date from Roman times, but it was thought possible that some could be much older. Accelerator mass spectrometry (AMS)-based ¹⁴C dating confirmed that the samples contained representatives from both the Roman and Chalcolithic periods. This paper provides a synthesis of DNA, isotope, and literary analysis to illuminate textile history at the Christmas Cave site.     

Increasing contextual information by merging existing archaeological data with state of the art laser scanning in the prehistoric funerary deposit of Pastora Cave,Eastern Spain

In this paper we present a virtual reconstruction of prehistoric funerary practices in Pastora Cave, a collective burial site in Eastern Spain that dates from the Late Neolithic, Chalcolithic and Bronze Age. Modern data of the cave was captured by 3D laser scanning techniques and added to recorded archaeological data and 3D graphic information. The combination of these data sets allowed us to create a hypothetical reconstruction to analyze the material excavated in the 1940s and 50s in greater spatial context. A 3D model of the current cave was created in order to serve as a basis for modeling the relative stratigraphic information available. We present the methodology employed and the results and implications of the analysis for Pastora Cave with particular emphasis on the spatial and chronological data.     

The Rolt Memorial Lecture 2018: Science and Engineering at War in Orkney

Initially conceived as a contribution to a conference which was to have been based in Caithness and was to have included a visit to Orkney, this paper examines the scientific and technological background to some of the wartime remains associated with the defence of Scapa Flow, the Royal Navy’s principal fleet anchorage in home waters in World Wars I and II. Summarising the surviving evidence of selected aspects of vessel-related, marine and aerial science and engineering around Scapa Flow, it is prefaced by a short account of Tom Rolt’s own wartime career, and concludes with a comparative appreciation of his place in the pantheon of literary engineers.     

Citizen and Monument. The Case of the Greek Island of Naxos

Abstract

Naxos, the largest island of the Cyclades in the Aegean Sea in Greece, has been continuously inhabited from Neolithic times to the present and is full of architectural remains from all historical periods. Traditional settlements, castles, towers, numerous Byzantine and post-Byzantine churches, and several archaeological sites testify to its long and significant history.

The relationship between inhabitants and their archaeological heritage is multifaceted and of special interest. This article analyses the history of this relationship, the reasons that shaped its quality, the problems, and perspectives. It also explores the ways in which citizens, in this particular case the Naxians, participate in the protection of their monuments at a time when tourist development dominates the Naxian economy.     

A Methodological Approach Towards Conservation

Abstract

Since conservation became a recognized discipline, professionals involved in conservation projects have tried to find the best criteria for their interventions. Often these criteria remain quite vague, based on the idea that every historic building has its own special conditions, which make its problems different from other buildings. This conviction, which is appropriate at one level, has serious consequences due to the lack of a consistent methodology. More than a lack of criteria, we might talk about a lack of 'habit' in identifying values in the Mediterranean region: the concept of values is much more widespread in Anglo-Saxon countries.

If we take a look at the history of conservation, there are a number of cases which are often used as models: for example, the Colosseum or the Arch of Titus in Rome, both interventions which are greatly admired and included in many conservation manuals. More recently there are projects which are widely accepted by the heritage conservation community as well: the paper explores the Palace of the Partal (Granada), the Villa Romana del Casale (Piazza Armerina), the theatre at Orange, and the Insula Orientalis I in Herculaneum. In this article, I suggest that there are constant elements within these conservation projects, reflecting typological, structural, constructional, functional, aesthetic, formal, historical, and symbolic values. These features represent a way of planning a conservation project and a critical methodology to judge the outcomes of the project in an objective manner. The methodology is qualitative rather than quantitative. All historic buildings have a set of values developed from their origins and throughout their history. These values can be analysed to extract the most important elements to be preserved. Analysing the values of our built heritage will allow us to create better decision-making processes.     

The Absolute Speed of Change: Multidimensional Scaling and Innovation Rates

The evaluation of societal developments depends on a clear determination of the rate of change that occurs within societies. While many statistical approaches are able to indicate similarity/dissimilarity distances between archaeological assemblages, only a few can be linked to linear timescales. In the following approach, the advantages of non‐metric multidimensional scaling (NMDS) are described as a method that produces gradients for a quantitative measurement of cultural change on a linear timescale. Thus, the speed of innovations or the regression of cultural developments could be quantified. In consequence, a quantified proxy of societal developments on a linear timescale is provided. In two examples, the usefulness of such a proxy is described in relation to other data.     

Investigating Dietary Patterns with Stable Isotope Ratios of Collagen and Starch Grain Analysis of Dental Calculus at the Iron Age Cemetery Site of Heigouliang,Xinjiang, China

Here, we present δ¹³C and δ¹⁵N results for the dietary reconstruction of nomadic pastoralists from the Iron Age (ca. 1000 bc –8 ad ) site of Heigouliang. The human (n = 27) δ¹³C values range from −19.6‰ to −17.0‰ with a mean value of −18.5 ± 0.5‰, and the δ¹⁵N results range from 11.5‰ to 13.8‰ with a mean value of 12.4 ± 0.6‰. The results indicated that animals, like sheep, were part of the predominately C₃ terrestrial diet, but two individuals have values greater than −18‰ that is indicative of some input of C₄ foods in their diets. Because of a lack of faunal samples and to supply complementary information concerning plant consumption, teeth from four individuals were analysed for dental calculus microfossils. Starch grains were found to correspond to Triticeae and Poaceae, possibly including wheat (Triticum aestivum), barley (Hordeum vulgare), highland barley (H. vulgare L var. nudum), foxtail millet (Setaria italica) and/or common millet (Panicum miliaceum). At the population level, no dietary differences were detected between burial owners and sacrificial victims, but variations were found when specific tombs were analysed. In particular, individuals with bone trauma associated with armed conflict also had distinct isotopic signatures possibly suggesting that some of the sacrificial victims could have been captured warriors that were sacrificed for the burial owners. While limited, the results are some of the first from an Iron Age population from Xinjiang and contribute to our understanding of the dietary patterns of this region. Copyright © 2015 John Wiley & Sons, Ltd.