清代淮河流域旱涝灾害的人为因素分析

本文根据历史文献的记载,对清代淮河流域的水旱灾害进行了量化分析,得出了此时期旱涝灾害发生的基本情况。淮河流域的旱涝灾害有的是纯自然力所为,但更多的是人们利用自然的失当所致。本文主要从人为活动因素即人类的不当行为入手,对清代淮河流域旱涝灾害发生的原因作一初步考察。     

清末民初西布特哈地区教育问题述略——以《档案史料选编·黑龙江少数民族》为中心

光绪三十二年（1906）,清政府以嫩江为界,将原布特哈八旗分为东、西两路,始有“西布特哈”之称。清末民初西布特哈地区的教育问题,实质上就是这一地区达斡尔、鄂温克族的民族教育问题。本文以地方官员对西布特哈教育的关注及西布特哈地区教育的民族因素等主要问题为门径,揭示清末民初东北边疆地区特有的少数民族地区教育的发展规律,分析西布特哈地区文化发展的内涵及其社会发展问题。     

The mineralogy and petrography of Low Lands Ware 1 (Roman lower Rhine–Meuse–Scheldt basin; the Netherlands,Belgium, Germany)

Over the last 80 years Belgian, Dutch and German archaeologists working in the lower Rhine–Meuse–Scheldt basin have encountered a Roman pottery group that occurs in large quantities at most Roman sites in the region. Several researchers have separately tried to define this pottery, resulting in different names. Petrographic and geochemical analyses of 100 samples have now shown that the production of this ware predominantly made use of one source of raw material, divisible into three sub-groups on the basis of technological choices. The probable source lies in the early-Pleistocene Tegelen-formation, a clay rich in muscovite mica and garnet, which outcrops in the tertiary Scheldt escarpment (Nl) and the campine microcuesta (B). On the basis of geographical characteristics, Roman finds and the presence of a large Medieval pottery industry, production in the Bergen-op-Zoom area is suggested. In view of these new findings the name ‘Low Lands Ware 1’ is introduced to refer to this pottery group.     

On the origins of extractive metallurgy: new evidence from Europe

The beginnings of extractive metallurgy in Eurasia are contentious. The first cast copper objects in this region emerge c. 7000 years ago, and their production has been tentatively linked to centres in the Near East. This assumption, however, is not substantiated by evidence for copper smelting in those centres. Here, we present results from recent excavations from Belovode, a Vin?a culture site in Eastern Serbia, which has provided the earliest direct evidence for copper smelting to date. The earliest copper smelting activities there took place c. 7000 years ago, contemporary with the emergence of the first cast copper objects. Through optical, chemical and provenance analyses of copper slag, minerals, ores and artefacts, we demonstrate the presence of an established metallurgical technology during this period, exploiting multiple sources for raw materials. These results extend the known record of copper smelting by more than half a millennium, with substantial implications. Extractive metallurgy occurs at a location far away from the Near East, challenging the traditional model of a single origin of metallurgy and reviving the possibility of multiple, independent inventions.     

Force-Based Beam Finite Element (FE) for the Pushover Analysis of Masonry Buildings

A simplified approach for analyzing the nonlinear response of masonry buildings, based on the equivalent frame modeling procedure and on the nonlinear equivalent static analyses, is presented. A nonlinear beam finite element (FE) is formulated in the framework of a force-based approach, where the stress fields are expanded along the beam local axis, and introduced in a global displacement-based FE code. In order to model the nonlinear constitutive response of the masonry material, the lumped hinge approach is adopted and both flexural and shear plastic hinges are located at the two end nodes of the beam. A classical elastic-plastic constitutive relationship describes the nonlinear response of the hinges, the evolution of the plastic variables being governed by the Kuhn-Tucker and consistency conditions. An efficient element state determination procedure is implemented, which condenses the local deformation residual into the global residual vector, thus avoiding the need to perform the inner loops for computing the element nonlinear response. The comparison with some relevant experimental and real full-scale masonry walls is presented, obtaining a very good agreement with the available results, both in terms of global pushover curves and damage distributions.     

Experimental Dynamic Testing and Numerical Modeling of Historical Belfry

The experimental characterization of historical bell towers and wall belfries can provide important information for the calibration of numerical models as well as to implement proper restoration strategies. Within this framework, the presented study is concerned with the experimental dynamic assessment of an ancient belfry dating back to 1537. The structure is part of the “Santa Maria in Aracoeli Church” (Rome, Italy), an important heritage construction placed on the summit of the Capitoline Hill, close to the building that hosts the Major’s office. Several field tests have been conducted using accelerometers, and records obtained under different dynamic loading scenarios have been examined. Moreover, experimental accelerations have been elaborated to estimate the most important modal features of the structure and to validate a finite element model. Field tests have confirmed that severe vibrations are induced when the bells swing, and thus a slight reduction of the swing angle has been suggested in order to provide an immediate and inexpensive benefit to the structure. A new set of field tests demonstrates that the new swing angle is sufficient to reduce the induced vibrations while preserving the original sound.     

Discrete Element Analysis of the Minimum Thickness of Oval Masonry Domes

This study focuses on domes the ground plan of which, instead of the more common circular shape, is an oval, and aims at finding the minimally necessary uniform wall thickness for domes of different geometries loaded by their selfweight. The discrete element code 3DEC was applied because of its capability of simulating the collapse mechanisms of masonry structures. Results on the minimal wall thickness, corresponding masonry volume and failure mechanisms for different dome geometries are presented. Three ranges of the friction coefficient were found. For very low frictional resistance collapse happens with pure frictional sliding, for any arbitrarily large wall thickness. In the range of relatively high (i.e., realistic) friction coefficients the structure collapses without any sliding if the wall is not sufficiently thick, and in the observed range of the friction coefficient the necessary wall thickness is nearly insensitive to its value (collapse initiates with hinging cracks only). Between the two domains an intermediate behavior was found: combined cracking and sliding collapse modes occur for insufficient wall thickness, and the minimal thickness strongly depends on the friction coefficient. The critical and transitional friction coefficients separating the failure modes were determined for different eccentricities of the groundplan.     

Determining when rare (zoo-)archaeological phenomena are truly absent

Archaeologists are regularly faced with the dilemma of determining if the absence of a class of item is the result of that class never having been present in an area or if its absence is the result of sample deficiencies. This dilemma is especially apparent when a class of item is rare and has a patchy distribution. Comparison of samples that lack specimens of the class with samples that have specimens reveals criteria of an adequate sample. These criteria must be met by a sample in order to convincingly argue that the class of item was never present in the area from which the sample derives, and to provide guidelines for developing sampling designs aimed at discovering rare phenomena.     

Changes in reindeer body part representation at Grotte XVI, Dordogne, France

Foraging theory models are used to examine changes in reindeer body part representation in the Middle and Upper Paleolithic ungulate assemblages at Grotte XVI (Dordogne, France). Previous research suggests that climate change resulted in progressive increases in reindeer abundances throughout the region. If increased forager encounter rates with reindeer resulted in decreased transport distances and search times, central-place forager models predict that field processing at the kill site will decline and reindeer body part transport will become less selective. This prediction is supported, and reindeer skeletal element abundances are shown to become increasingly even and incorporate higher frequencies of low utility elements through time. The progressive shift in reindeer transport strategies operates across technological and hominin species boundaries including the Middle-to-Upper Paleolithic transition.