OPTICAL DATING OF SINGLE AND MULTIPLE GRAINS OF QUARTZ FROM JINMIUM ROCK SHELTER,NORTHERN AUSTRALIA: PART I,EXPERIMENTAL DESIGN AND STATISTICAL MODELS*

Jinmium rock shelter is famous for the claims made by Fullagar et al. (1996) for the early human colonization and ancient rock art of northern Australia. These claims were based on thermo-luminescence ages obtained for the artefact-bearing quartz sediments that form the floor deposit at the site. In this paper, we outline the background to the optical dating programme at Jinmium, and describe the experimental design and statistical methods used to obtain optical ages from single grains of quartz sand. The results, interpretations, and implications of this dating programme are reported in a companion paper (Roberts et al. 7999, this volume).     

Insecurity and Pastoral Development in the Sahel

In this article it is argued that conventional agro-ecological and organizational concepts used in pastoral development are strongly biased towards the formulation and enforcement of norms. This leads development experts to attempts to control pastoralists and their herds. The policies and development interventions based on these assumptions have been largely unsuccessful. As a consequence attention for dryland areas and pastoral development has declined among researchers and development agencies. An important reason for this failure is the fundamental misfit between these normative concepts and the reality of dryland ecosystems and pastoral society. In order to show this, an alternative view on rangeland ecology and pastoral society is presented, supported by a case study of Fulbe pastoral society in dryland Central Mali. The authors argue that approaches to pastoral development must be revised in the direction of the dynamics inherent in the pastoral way of life.     

A Synthesis of Aggregation Methods for Multifacility Location Problems: Strategies for Containing Error

When solving a location problem using aggregated units to represent demand, it is well known that the process of aggregation introduces error. Research has focussed on individual components of error, with little work on identifying and controlling total error. We provide a focussed review of some of this literature and suggest a strategy for controlling total error. Consideration of alternative criteria for evaluating aggregation schemes shows that the method selected should be compatible with the objectives of the analyses in which it is used. Experiments are described that show that two different measures of error are related in a nonlinear way to the number of aggregate demand points (q), for any value of the number of facilities (p). We focus on the parameter q/p and show that it is critical for determining the expected severity of the error. Many practical implementations of location algorithms operate within the range of q/p where the rate of change of error with respect to q/p is highest.     

The Intellectual Internment of a Conflict: The Forgotten War in Northern Ireland

One of the most enduring ideas about the Northern Ireland conflict is that it has been rigorously studied. This is a myth. The stark absence of analysis of its military and international dimensions makes the conflict one of the least understood of modern times. Scholarly studies of Northern Ireland have been insulated from influences in the wider academic world by the dominance of hitherto unchallenged images about the crisis. These images support a dominant orthodoxy that has confined intellectual investigation of the 'Troubles' to Northern Ireland itself, sustaining a view that little of value can be gained from studying the military nature of the conflict. This orthodoxy is one to which, depressingly, the international relations community has been only too willing to contribute to justify its fear and neglect. Not only does this reflect poorly on academic practice but it has also helped to engender a dangerously distorted image of the conflict that bodes ill for the future.     

Asymmetric Entrant Locaiton with a Discrete Consumer Distribution: Spatial Price Discrimination Versus Mill Pricing

In this paper I examine the profit-maximizing locations of entrants. Suppose that firms practice spatial price discrimination and consumer locations are discrete, such as five equally spaced towns on a roadway. With completely inelastic consumer demand an entrant between two existing firms is often indifferent between the symmetric (central) location and a continuum of asymmetric (noncentral) locations. However, downward-sloping consumer demand often causes the entrant to strictly prefer either of two asymmetric locations to any other location. These results are very different from those found in mill-pricing (free-on-board or f.o.b.-pricing) models.     

A Political Explanation of Policy Selection: The Case of Urban School Reform

Amid the torrent of reform activity in urban school systems, some proposals fare better than others. The traditional technocratic presumption is that reforms are chosen for their educational merit. I suggest that, to the contrary, institutional incentives encourage urban policymakers to emphasize symbolic appeal. Data from a 1995 study of 57 urban districts are used to compare the fate of two school reforms. The more symbolically attractive reform was supported, proposed, and enacted much more widely, although neither research nor observer responses suggested its superiority.     

Redundancy, Third-Party Government, and Consumer Choice: HIV/AIDS Nonprofit Organizations in New York City

This article addresses two questions: (a)Why were so many new nonprofit organizations in New York City created to “fight AIDS?” and (b) What are some consequences of this phenomenon? Drawing on redundancy theory as a partial explanation, it also considers the role of racial and ethnic politics and the impact of government contracting on the formation and growth of community-based organizations. For clients, the effect has been paradoxical: financial support of a large number of organizations led to a complex and fragmented delivery system offering some clients a range of choices but decreasing access for those less able to navigate a complex system.