Spatial Diffusion of the HIV/AIDS Epidemic: Modeling Implications and Case Study of AIDS Incidence in Ohio

This paper extends a compartmental epidemiological model for HIV transmission and AIDS incidence to include hierarchical and expansion spatial diffusion. An implication of the resultant model is that hierarchical diffusion causes the large infection growth rates of densely populated areas at the top of the central places hierarchy to “chain” down and dominate small local growth rates during the exponential-growth phase of the epidemic. Also, hierarchical diffusion causes a high transient growth rate in the first few years of a local epidemic. The spatial compartmental model fits observed AIDS incidence spatial diffusion patterns in Ohio reasonably well.     

The changing nature of GIS and the provision of formal GIS education in the UK: a case study

The arrival of the term Geographical Information System (GIS) in the 1960s soon created a demand for training and education in the use of this specialist hardware and software. Initially the main focus was on training people to use GIS, formal named degree programmes leading to postgraduate and undergraduate qualifications arrived later. This paper explores the changing landscape of U.K. degree level GIS education drawing on contemporary information from Higher Education Institution websites and a case study of the first single honours degree in GIS in Europe. The paper identifies a rise and fall in the number of named undergraduate “GIS” degrees since the late 1980s sandwiched between the continuation and development of postgraduate qualifications. In parallel with this trend the teaching and learning of GIS skills has emerged as a core component of undergraduate degree programmes with “Geography” in their title and in national school and degree level benchmarking statements for the discipline.     

Liverpool’s Cotton Importers c. 1700 to 1914

Liverpool’s first cotton importers dealt in a range of commodities and this pattern continued until the late eighteenth century. As the British cotton industry grew and new sources of raw cotton – particularly the United States – emerged, some merchants specialized increasingly in cotton in the early decades of the nineteenth century. By the end of the century, the largest importers of cotton dealt in little besides cotton. The growing prosperity of Liverpool’s cotton trade drew companies from elsewhere in the United Kingdom to Liverpool to participate in this trade. By the mid nineteenth century, several key cotton importing houses had originated in the United States; by the end of the nineteenth century the largest importers there. The manner of importing cotton changed. At first, importers had to send a ship out with a captain or supercargo with broad instructions about what to freight the ship with. As communications improved, importers were able to control their purchases of cotton more closely. In the nineteenth century, a significant amount of cotton was imported through Liverpool by merchants acting on a commission basis but this form of importing declined in the later decades of the century.     

Isotopic and technological variation in prehistoric Southeast Asian primary copper production

The ‘Southeast Asian Lead Isotope Project’ (SEALIP) is intended to provide reliable geochemical proxies for late prehistoric through early historic (2nd/1st millennium BCE and 1st millennium CE) local, regional, and inter-regional social interactions, in an archaeological arena lacking established ceramic typologies with which to cross modern national boundaries. We present lead isotope characterisations of the three currently known Southeast Asian prehistoric primary (mining/smelting) copper production centres: Phu Lon and the Khao Wong Prachan Valley in Thailand, and the recently discovered Xepon complex in Laos. Kernel Density Estimation shows that these production centres can be clearly distinguished isotopically, as such fulfilling the core tenet of the ‘Provenance Hypothesis’ (Wilson and Pollard, 2001: 508) and permitting SEALIP to proceed as a research programme tracing regional copper/bronze/lead exchange and provenance patterning. In addition we provide a provisional technological reconstruction of copper smelting processes at Phu Lon to complement our more established understanding of the Khao Wong Prachan Valley. Combined lead isotope and technological datasets allow us to tentatively identify trends in the evolution of Southeast Asian metal technologies and of regional social perceptions of metal exchange.     

Introduction

The public are engaging more with archaeology today than ever before, whether this is through the plethora of television channels increasing access to and providing reinterpretations of archaeological sites and finds, or through the blockbuster exhibitions hosted by museums (see Holtorf 2005, 2007). However are the public just expected to be consumers or should they be encouraged to participate and help direct the archaeological work being undertaken through active engagement?