The early second millennium ceramic assemblage from Kenan Tepe, Southeastern Turkey: a preliminary assessment

pre-printIn the initial survey of the upper Tigris river valley the authors o f the survey report concluded that ‘either this portion o f the Tigris basin was bypassed entirely by Middle Bronze Age development attested to elsewhere or, more likely, it is characterised by a thus far unreported and unrecognised assemblage* (Algaze et al. 1991: 183). Recent research by members of the Upper Tigris Archaeological Research Project (UTARP) at the site o f Kenan Tepe confirms the latter hypothesis, that the early second millennium in this area is marked by a regionally distinct material culture assemblage that is influenced by ceramic traditions in upper Mesopotamia and other material culture traditions in Anatolia. This article outlines our initial assessment of these data including an analysis of the ceramic corpus, architecture, archaeobotany, small finds and carbon-14, and places these data in a regional context. We conclude by speculating that the inhabitants of Kenan Tepe may have participated in interaction spheres that linked the upper Tigris river region to greater Mesopotamia and Anatolia

Stability of Solution of the Nonlinear Schr\"odinger Equation for the Bose-Einstein Condensation

We investigate the stability of the Bose-Einstein condensate (BEC) the case of atoms with negative scattering lengths at zero temperature using the Ginzburg-Pitaevskii-Gross (GPG) stationary theory. We have found a new exact equation for determining the upper bound of the critical numbers $N_{cr}$ of atoms for a metastable state to exist. Our calculated value of $N_{cr}$ for Bose-Einstein condensation of lithium atoms based on our new equation is in agreement with those observed in a agreement with those observed in a recent experiment.Comment: 8 pages, Late

Half-AUC for the evaluation of sensitive or specific classifiers

This paper describes a simple, non-parametric variant of area under the receiver operating characteristic (ROC) curve (AUC), which we call half-AUC (HAUC). By measuring AUC in two halves: first when the true positive rate (TPR) is greater than the true negative rate (TNR) and then when TPR is less than TNR, we obtain a measure of a classifier's overall sensitivity (HAUC(Se)) and specificity (HAUC(Sp)) respectively. We show that these HAUC measures can be interpreted as the probability of correct ranking under the constraint that one class must have a higher detection rate than the other. We then go on to describe application domains where this constraint is appropriate and hence where HAUC may be superior to AUC. We show examples where HAUC discriminates ROC curves both when one curve dominates another and when the curves cross, but have an equivalent AUC. (C) 2013 Elsevier B.V. All rights reserved

Bose-Einstein condensation thermodynamics of a trapped gas with attractive interaction

We study the Bose-Einstein condensation of an interacting gas with attractive interaction confined in a harmonic trap using a semiclassical two-fluid mean-field model. The condensed state is described by converged numerical solution of the Gross-Pitaevskii equation. By solving the system of coupled equations of this model iteratively we obtain converged results for the temperature dependencies of the condensate fraction, chemical potential, and internal energy for the Bose-Einstein condensate of $^7$Li atoms.Comment: Five latex pages, four postscript figures, Accepted in Physica

Equivalent Linear Two-Body Equations for Many-Body Systems

A method has been developed for obtaining equivalent linear two-body equations (ELTBE) for the system of many ($N$) bosons using the variational principle. The method has been applied to the one-dimensional N-body problem with pair-wise contact interactions (McGurie-Yang N-body problem) and to the dilute Bose-Einstein condensation (BEC) of atoms in anisotropic harmonic traps at zero temperature. For both cases, it is shown that the method gives excellent results for large N.Comment: 12 pages, Late

Three-Year Longitudinal Service-Learning Research Study: Preliminary Findings

Using an experimental design, this study examines the contributions of service-learning to decreased at-risk behaviors, student cognitive, social, and personal development, and academic achievement over a three-year period. During the pilot phase and Years One and Two, teachers and students from eleven different Ohio schools have been surveyed. Preliminary findings are presented

On the anomalous behaviour of anisotropic sheet metals

Using Hill's 1948 criterion [1] for anisotropic yielding and the strain ratio, r, it has been shown that the ratio of the balanced biaxial yield stress, [sigma]b, to the uniaxial tensile yield stress, [sigma]u, should be > 1 if r > 1 and r r b to [sigma]u was always > 1 in that study. This was termed anomalous behaviour. Hill has proposed a new criterion[3] that not only appears to provide greater flexibility than does his earlier version but can also encompass anomalous behaviour which the earlier version cannot.Four simplified cases of the 1979 criterion have been proposed[3] and to date only one has been subjected to experimental assessment. However, the goals of those studies were not concerned with anomalous behaviour per se. In this paper, all four cases are analysed to determine the interrelationships of the parameters r and m (exponent in Hill's new criterion) required to encompass anomalous behaviour. It is found that for each of the four cases anomalous behaviour is predicted for a range of (m, r) combinations which are presented graphically in this paper.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/24964/1/0000391.pd

Bistability and macroscopic quantum coherence in a BEC of ^7Li

We consider a Bose-Einstein condensate (BEC) of $^7Li$ in a situation where the density undergoes a symmetry breaking in real space. This occurs for a suitable number of condensed atoms in a double well potential, obtained by adding a standing wave light field to the trap potential. Evidence of bistability results from the solution of the Gross-Pitaevskii equation. By second quantization, we show that the classical bistable situation is in fact a Schr\"odinger cat (SC) and evaluate the tunneling rate between the two SC states. The oscillation between the two states is called MQC (macroscopic quantum coherence); we study the effects of losses on MQC.Comment: 8 pages, 11 figures. e-mail: [email protected]

How Does a Dipolar Bose-Einstein Condensate Collapse?

We emphasize that the macroscopic collapse of a dipolar Bose-Einstein condensate in a pancake-shaped trap occurs through local density fluctuations, rather than through a global collapse to the trap center. This hypothesis is supported by a recent experiment in a chromium condensate.Comment: Proceedings of 17th International Laser Physics Worksho