Polities, territory and historical change in Postclassic Matlatzinco (Toluca Valley, central Mexico)

Historical interpretation of political dynamics in pre-conquest central Mexico from indigenous records is fraught with difficulties. Beyond the basic challenges involved in interpreting fragmentary evidence is the fact that the majority of evidence comes from the dominant imperial polity (Tenochtitlan) and paints a biased and overly generalized view of political and social dynamics in provincial areas. We present a reconstruction of the political geography of the Toluca Valley of central Mexico in Aztec times that avoids these biases by focusing not on the events described in native histories, but on the individual towns and their spatial locations. We find that a theoretical perspective that defines political entities by networks and relations among people more adequately captures the historical situation than traditional models that define polities based on territory and boundaries.     

Human skeletal and mummified remains from the AD1854 siege of Mugombane,Limpopo South Africa

In 1854 Chief Mugombane and members of his Kekana Ndebele chiefdom took refuge in what is now known as Historic Cave, in the Makapan Valley, South Africa. The chiefdom retreated into the cave following an attack on a party of Trekboers. The subsequent siege of the cave, which lasted just under a month, ended in the death and surrender of its occupants and their dispersal among the Trekboers and their African auxiliaries. However, the number of people and the composition of the group that hid in the cave, as well as factors that led to the demise of the Kekana became blurred in the various renderings of the historical event. During the 1980s researchers began to cast doubt on the original Trekboer documents and the magnitude of the event when it became apparent that the Kekana oral histories remained silent on the matter. Between 2001 and 2007 the material remains of the siege were excavated to provide new data from which to judge the scale and impact of the siege event. Human remains, the primary focus of this paper, afford this perspective. This paper provides the result of the analysis of the human remains excavated from the cave, as well as an account of those remains that have been recorded or are housed in collections. The study of two naturally mummified individuals removed from the caves and stored in collections is also presented.     

Measuring prehistoric mobility strategies based on obsidian geochemical and technological signatures in the Owens Valley,California

We compare the organization of obsidian flaked stone technologies in two different time periods at CA-INY-30, a village site in southern Owens Valley, eastern California. Previous archaeological studies suggest a reorganization in settlement patterns between the Newberry (ca. 3500–1500 BP) and Marana (ca. 650-contact) periods, from a highly mobile to a more residentially sedentary one. New geochemical data, based on laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analyses of obsidian artifacts associated with discrete house floors, support this basic settlement model, but reveal new detail in how people moved across the landscape and accessed, extracted, reduced and used obsidian resources. In the earlier Newberry period, there is no relationship between flake size and distance-to-source, and the falloff curve relating frequency of obsidian against distance is more gradual, as expected, but contrary to our expectations, source diversity is not higher. These factors suggest extremely high mobility, but also selective extraction of particular sources. Newberry obsidian may have been acquired by groups of hunters who embedded quarrying within long-distance trips to distant hunting grounds, and subsequently transported bifacial cores to base camps. By contrast, Marana patterns show strong relationships between flake size and distance from source and steeper fall-off curves, suggesting groups acquired their obsidian primarily from closer sources, likely via exchange networks. At the same time, geochemical diversity, especially among smaller resharpening flakes, is higher in the Marana period, highlighting the wide-ranging conveyance systems through which obsidian moved.     

Dental morphological evidence for biological continuity between the A-group and C-group periods in lower Nubia

Data are presented on non-metric dental morphological traits in skeletal samples from the Lower Nubian A-Group (ca. 3100–2500 BC) and C-Group (ca. 2000–1500 BC) cultural periods. In order to examine possible biological differentiation between these two periods, their trait frequencies were analysed using the mean measure of divergence statistic. Results indicate biological continuity, consistent with in situ evolution, although the problem of small samples requires that these results be accepted with caution. Although the diffusion of ideas or material culture into the area through military and trade contacts is likely, any archaeologically observable cultural differences between these two phases are more consistent with local cultural evolution than with the importation of a new cultural system through the migration of a foreign population into the area. The timing of a population replacement in ancient Nubia that has been identified by other scholars should now be sought either before the A-Group period or after the C-Group.     

New Perspectives on Sincu Bara, a First Millennium Site in the Senegal Valley

The 67-ha site of Sincu Bara was discovered and extensively excavated in the 1970s. Three primary aspects of its archaeological interest were its vast size, its location in the Middle Senegal Valley, where some of the earliest regional polities in West Africa arose, and the extensive and diverse assortment of copper-based metal artifacts it produced. Deposits with brass appeared to be associated with radiocarbon dates as early as the fifth century AD. It appeared that most of the deposits related to a single, long-lasting occupation by people who arrived with sophisticated copper-based metallurgy in the fifth century and remained at least until the eleventh century, without discernible modification in their material culture. Results of new excavations in 1991–1992 indicate that this interpretation must be substantially modified, since considerable change in material culture, including the introduction of copper-based metals between AD 800 and AD 900, has now been documented. This article summarizes the data from these new excavations and suggests that earlier interpretations were based largely on material from disturbed, severely mixed deposits, which gave a false picture of homogeneity through time.Les soixante sept héctares constituant le gisement du Sincu Bara étaient découverts et fouillés dans les années soixante dix. Son intérêt archéologique est lié aux trois aspects: sa grande superficie, sa location dans la vallée moyenne du Sénégal où les premières unités politiques de l'Afrique de l'Ouest existaient, et finalement, la diversité des objets métalliques en cuivre que le site a livrée. Il apparaît que la plupart des dépôts appartient à une seule occupation de longue durée par un peuple qui est arrivé pendant la cinquième siécle AD, en possession de la connaissance de métallurgie à base de cuivre et qui montrait au moins jusqu'au onzième siécle peu de modification dans leur culture materielle. Les résultats des fouilles de 1991–1992 montrent que cette interpretation doit être modifiée, car il y a eu du changement considérable dans le matèriel, comme l'introduction des métaux à base de cuivre entre AD 800–900. Dans cet article, nous avons résumé les résultats des nouvelles fouilles et nous suggérons que les anciennes interpretations ont été largement fondées sur du matériel perturbé, des dépôts mixtes qui donnaient une image fausse de l'homogenité pendant cette période.     

贺兰口岩画附近典型危岩体稳定性分析

通过前期现场调查,分析了贺兰口岩画的主要病害,提出岩画附近的危岩体是其中威胁较大的一类地质病害。根据现场勘察将贺兰口岩画附近不同状态的危岩体分为坠落式、滑塌式和倾倒式三类失稳模式。经过室内试验得到了岩石矿物组成、密度、气孔率、吸水率、单轴抗压强度等物理性质,并且利用Hoek-Brown准则、贯通率法以及岩石表面回弹值估算了危岩体与主控结构面的强度参数,例如单轴抗拉和抗压强度、变形模量、内摩擦角和黏聚力,然后利用不同失稳模式的计算方法进行稳定性分析。结果表明部分危岩体处于不稳定状态中,需要进行加固。     

From automation to Silicon Valley: the automation movement of the 1950s,Arnold Beckman,and William Shockley

Most studies mark the start of silicon electronics in Silicon Valley with William Shockley and Arnold Beckman’s creation of the Shockley Semiconductor Laboratory. This study details how the automation movement of the 1950s shaped the careers of both Shockley and Beckman, and formed an indispensible context for their creation of Shockley Semiconductor. Shockley was engaged in automation from the early 1950s, promoting his vision of an ‘automatic trainable robot’ to revolutionize manufacturing. Beckman was deeply involved in automation in the mid-1950s, orienting his company to key technologies for the ‘automatic factory:’ instrumentation and computers. Beckman and Shockley’s entrepreneurial involvements with electronics and automation led them to create Shockley Semiconductor to pursue silicon transistors in 1955.     

Understanding local innovation systems in peripheral tourism destinations

Tourism destinations in peripheral areas are often large regions established by centralised government agencies to encourage collaboration between dispersed communities and foster innovation. Relatively little research attention has been paid to the impact that centrally defined destination boundaries have on whether and how small communities contribute to innovation at a regional level. This paper examines the case of Burra, a small town in rural South Australia. It analyses the networking, collaboration and knowledge exchange behaviour of tourism stakeholders in the context of the state-government-defined ‘Clare Valley’ tourism region. Data were drawn from a web-based social network analysis, in-depth interviews, historic document analysis and field observations. The study found that the local tourism system had limited aspirations and capabilities to collaborate with other towns in the region. Lack of regional engagement was only partially due to intra-regional competition and resistance to regional boundaries. More significant barriers included a local culture of operating in isolation, an embedded reliance on public sector leadership to manage systemic interactions, an aging system with limited ambition to change and an inability to harness in-migrants and externally based stakeholders to stimulate knowledge transfer. Changing the imposed destination boundaries would have limited impact on the operation of the local system. The paper concludes that effective regional destination development in peripheral areas needs to be better informed by more detailed understandings of local tourism systems and their capacities to engage.     

嫩江流域青铜时代生业方式研究

本文详细地分析了嫩江流域青铜时代的遗址墓葬的地理分布及周围环境、遗址自身特点、生产生活用具的分类及数量、动物骨骼及各种贝类遗存等方面的资料,得出该地区的生业方式是一种复合型的——定居、狩猎、捕捞、采集、畜养、手工业以及少量的交换经济,这几种经济方式相互补充,共同构成了一种有别于青铜时代中原地区以农业经济为主的新的生业方...