Defining function in Neolithic ceramics: the example of Makriyalos, Greece

Recent development in chemical analyses of organic remains in archaeological ceramics gives new possibilities to the study of pottery use. They could be of crucial importance in assessing vessel’s use, especially when combined with contextual, technomorphological and use-alteration analysis data. Using the example of the late Neolithic pottery from Makriyalos, Northern Greece, we discuss some of the problems in determining the use of the vessels from archaeological context, and show the benefits of integrating chemical analysis of organic remains in approaching this issue.Sodobni razvoj kemičnih analiz organskih ostankov v arheološki keramiki odpira nove možnosti raziskav njene uporabe. Te analize bi lahko bile ključnega pomena pri ocenjevanju uporabe posodja, še posebej v kombinaciji z drugimi kontekstualnimi ter tehnološko-morfološkimi podatki in podatki o spremembi namembnosti. Za primer smo vzeli poznoneolitsko keramiko z najdišča Makriyalos v severni Grčiji. Razpravljamo o nekaterih težavah pri določevanju uporabe posod na podlagi arheološkega konteksta in pokažemo prednosti, če upoštevamo kemične analize organskih ostankov

Introduction – Towards Systemic Approaches to Evaluation and Impact

This IDS Bulletin is the second of two that follow an Institute of Development Studies event seeking to define an agenda for research and practice of development impact evaluation. It focuses on exploring the potential of systems ideas and complexity concepts to meet the increasingly complex challenges of an increasingly ambitious development agenda. In particular, the contributions seek to: (a) redefine ‘learning’ according to the number of ‘learning loops’ involved; (b) understand how to identify the most relevant impact evaluation questions; (c) simulate systems states in two sectors (leather and health) following the implementation of (combinations of) different policy options and other events; and finally, (d) shake the foundations of the impact evaluation institutional system, recommending that the notions of multiple perspectives and system boundaries are fully embraced, and that the system ultimately transitions from an ‘evaluation industrial complex’ to an ‘evaluation adaptive complex’. While the issue is a step in the right direction, much more work remains to be done

The circulation and consumption of Red Lustrous Wheelmade Ware: petrographic, chemical and residue analysis

yesRed Lustrous Wheelmade ware is one of the most recognisable classes of pottery from the Late Bronze Age of the east Mediterranean. Yet both its production source and the nature of its contents and use remain a source of some debate. These questions are tackled here through an intensive programme of scientific analysis involving 95 samples of Red Lustrous Wheelmade ware and related wares from seven sites in Turkey, Cyprus and Egypt. Petrography and instrumental neutron activation analysis are combined in the study of the ceramic fabrics, with a view to specifying the source of this ware; while gas chromatography and gas chromatography-mass spectrometry are used to analyse absorbed and visible residues in and on the sherd samples, in the hope of shedding light on vessel contents and possible use. The results of the fabric analysis show the ware to be extremely homogeneous, indicative of a single source: northern Cyprus is at present the most likely candidate, although further analysis, particularly of clay samples from the region in question, would certainly be desirable. The residue analysis suggests that Red Lustrous Wheelmade ware might have been used to carry some kind of plant oils, possibly perfumed, and that in some instances the vessel interior was coated with beeswax as a sealant.AHR

PHA*: Finding the Shortest Path with A* in An Unknown Physical Environment

We address the problem of finding the shortest path between two points in an unknown real physical environment, where a traveling agent must move around in the environment to explore unknown territory. We introduce the Physical-A* algorithm (PHA*) for solving this problem. PHA* expands all the mandatory nodes that A* would expand and returns the shortest path between the two points. However, due to the physical nature of the problem, the complexity of the algorithm is measured by the traveling effort of the moving agent and not by the number of generated nodes, as in standard A*. PHA* is presented as a two-level algorithm, such that its high level, A*, chooses the next node to be expanded and its low level directs the agent to that node in order to explore it. We present a number of variations for both the high-level and low-level procedures and evaluate their performance theoretically and experimentally. We show that the travel cost of our best variation is fairly close to the optimal travel cost, assuming that the mandatory nodes of A* are known in advance. We then generalize our algorithm to the multi-agent case, where a number of cooperative agents are designed to solve the problem. Specifically, we provide an experimental implementation for such a system. It should be noted that the problem addressed here is not a navigation problem, but rather a problem of finding the shortest path between two points for future usage

Coulomb drag between quantum wires with different electron densities

We study the way back-scattering electron--electron interaction generates Coulomb drag between quantum wires with different densities. At low temperature $T$ the system can undergo a commensurate-- incommensurate transition as the potential difference $|W|$ between the two wires passes a critical value $\Delta$, and this transition is reflected in a marked change in the dependence of drag resistivity on $W$ and $T$. At high temperature a density difference between the wires suppresses Coulomb drag induced by back scattering, and we use the Tomonaga--Luttinger model to study this suppression in detail.Comment: 6 pages, 4 figure

Setting school-level outcome standards

To establish international standards for medical schools, an appropriate panel of experts must decide on performance standards. A pilot test of such standards was set in the context of a multidimensional (multiple-choice question examination, objective structured clinical examination, faculty observation) examination at 8 leading schools in China. Methods  A group of 16 medical education leaders from a broad array of countries met over a 3-day period. These individuals considered competency domains, examination items, and the percentage of students who could fall below a cut-off score if the school was still to be considered as meeting competencies. This 2-step process started with a discussion of the borderline school and the relative difficulty of a borderline school in achieving acceptable standards in a given competency domain. Committee members then estimated the percentage of students falling below the standard that is tolerable at a borderline school and were allowed to revise their ratings after viewing pilot data. Results  Tolerable failure rates ranged from 10% to 26% across competency domains and examination types. As with other standard-setting exercises, standard deviations from initial to final estimates of the tolerable failure rates fell, but the cut-off scores did not change significantly. Final, but not initial cut-off scores were correlated with student failure rates ( r =  0.59, P  = 0.03). Discussion  This paper describes a method to set school-level outcome standards at an international level based on prior established standard-setting methods. Further refinement of this process and validation using other examinations in other countries will be needed to achieve accurate international standards.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/71572/1/j.1365-2929.2005.02374.x.pd