Social decision-making driven by artistic explore–exploit tension

We studied social decision-making in the rule-based improvisational dance There Might Be Others, where dancers make in-the-moment compositional choices. Rehearsals provided a natural test-bed with communication restricted to non-verbal cues. We observed a key artistic explore–exploit tension in which the dancers switched between exploitation of existing artistic opportunities and riskier exploration of new ones. We investigated how the rules influenced the dynamics using rehearsals together with a model generalized from evolutionary dynamics. We tuned the rules to heighten the tension and modelled nonlinear fitness and feedback dynamics for mutation rate to capture the observed temporal phasing of the dancers' exploration-versus-exploitation. Using bifurcation analysis, we identified key controls of the tension and showed how they could shape the decision-making dynamics of the model much like turning a ‘dial’ in the instructions to the dancers could shape the dance. The investigation became an integral part of the development of the dance.     

Dead missionaries,wild Sentinelese: An anthropological review of a global media event

This article aims to shed light on the background to a media event that occupied the world press, and even more the digital media, for a few weeks at the end of last year. The trope of the violent ‘murder’ of a white missionary by one of the last ‘uncontacted tribes’ is likely to evoke a variety of Western projections. Ultimately, it is about power over images, interpretations and how we want to behave towards isolated groups of people in today’s world: leave them alone? Protect them from the culture of violence at the fringe of their territories or contact them now and support them in the long term? An anthropological reading of the case does not lead to a simple answer to this question, but it might help in getting a more informed perspective on a complex subject matter.     

Goodbye to all that (again)? The Fischer thesis,the new revisionism and the meaning of the First World War

What is the truth about the nature of the First World War and why have historians been unable to agree on its origins? The interpretation that no one country was to blame prevailed until the 1960s when a bitter international controversy, sparked by the work of the Hamburg historian Fritz Fischer, arrived at the consensus that the Great War had been a ‘bid for world power’ by imperial Germany and therefore a conflict in which Britain had necessarily and justly engaged. But in this centennial year Fischer's conclusions have in turn been challenged by historians claiming that Europe's leaders all ‘sleepwalked’ into the catastrophe. This article, the text of the Martin Wight Memorial Lecture held at the University of Sussex in November 2014, explores the archival discoveries which underpinned the Fischer thesis of the 1960s and subsequent research, and asks with what justification such evidence is now being set aside by the new revisionism.     

MINERALOGICAL AND PETROLOGICAL INVESTIGATIONS OF EARLY BRONZE AGE COPPER‐SMELTING REMAINS FROM THE KIECHLBERG (TYROL,AUSTRIA)

The prehistoric settlement on the Kiechlberg hilltop is located a few kilometres to the north‐east of Innsbruck, in the Tyrolean Inn Valley. Despite its rather isolated location, a multiphase settlement between the fifth and the second millennium bc was confirmed by archaeological investigations in 2007 and 2008. Metallurgical artefacts, such as copper ore fragments, copper slag and raw copper, as well as finished copper and bronze artefacts, are concentrated mainly in Late Copper Age to Middle Bronze Age layers. The chemical compositions of the slag and raw metals confirm Fe—Zn tetrahedrite–tennantite (fahlore) smelting. The ore was most probably imported from the 30–50 km distant copper ore deposits (mainly fahlore) of Schwaz–Brixlegg, in the Lower Inn Valley. The small amount of slag and the presence of slagged and thermally altered ceramic fragments suggest copper production in small‐scale workshops. Most probably, sulphide‐rich ores were smelted in crucibles in a hearth fire. The process was relatively reducing below the 2Sb + 1.5O₂ → Sb₂O₃ reaction (?8.5 log fO₂ at 1100°C), producing Sb‐rich (>10 wt% Sb in metal) raw copper. Inhomogeneous slag remains containing high amounts of sulphide and metal inclusions suggest a poor separation of the metal, matte (copper sulphide) and silicate/oxide melt during the smelting process.     

DETECTING AND QUANTIFYING HEAT TREATMENT OF FLINT AND OTHER SILICA ROCKS: A NEW NON‐DESTRUCTIVE METHOD APPLIED TO HEAT‐TREATED FLINT FROM THE NEOLITHIC CHASSEY CULTURE,SOUTHERN FRANCE

Heat treatment of lithic raw material is known from the Middle Stone Age to the Neolithic. These findings require archaeometric techniques and methods for detecting the heat‐induced effects within lithic artefacts. However, the existing methods are often cost‐intensive and time‐consuming, and most of them are destructive. Here, we present a new method using the infrared spectroscopic measurement of the strength of H‐bonds formed between surface silanole groups (SiOH) and H₂O molecules held in open pores of the samples. The reduction of H‐bond strength in chalcedony is shown to be strongly correlated with the loss of open pores induced by heat treatment. Hence, the method is based on measuring one of the transformations aimed for by the instigators of the heat treatment: the reduction of porosity that modifies the rock's mechanical properties. A first application to heat‐treated material from the Neolithic Chassey culture (southern France) shows that flint was heated to temperatures between 200°C and 250°C in this period. This has important implications for the study of the procedures used and the heating environments. Our new method is non‐destructive, rapid, cost‐effective and allows for detection of the used annealing temperatures.     

SWEDEN AND THE LONG ‘1968’: BREAK OR CONTINUITY?

The first part gives a chronological overview of the Swedish ‘1968’, in this article defined as a phenomenon with its roots in the late 1950s and it's end around 1980. Three phases are identified: a ‘liberal’ until 1965, a ‘red’ in the late 1960s and the ‘diversified’ 1970s. Underlying this time schedule are two characteristics of the Swedish ‘1968’ in its extended form: the role of the social movements and the interaction between old and new movements; and the unique role of the intellectuals. The second part discusses the (late and limited) research so far on this topic in Sweden. The academic works are still few and the critical debate little developed. One of the topics discussed is to what extent ‘1968’ was something fundamentally new and to what extent it was influenced by older social movements.     

SENSITIVITY OF PARAMETERS FOR PROBABILISTIC SEISMIC HAZARD ANALYSIS USING A LOGIC TREE APPROACH

The sensitivity of different parameters used in probabilistic seismic hazard calculation is investigated by different logic tree runs with alternative magnitude sets, source zone models and attenuation relations, and with different sets of values for the seismicity parameters and the <r-value. Also the influence from the different parameters on the hazard uncertainty, represented by fractiles, is investigated. The calculations are made for peak ground acceleration at a site near Aachen in the Lower Rhine Embayment. The model where the site is located in a larger source zone gives lower hazard values. This is typical for the case where the seismicity near the site is high relative to its surrounding. The hazard curves for the different attenuation functions are similar, an effect of the similarity of the functions themselves. However, a large sensitivity of this parameter is indicated for small mean return periods. An increased α-value implies a moderate increase of the hazard at long mean return periods. The hazard is increasing for decreased focal depth, decreased β-value and increased maximum expected magnitude, respectively. However, the effects are noteworthy only at low hazard levels for variations in the focal depth and to some extent in the maximum expected magnitude. Finally, decreasing the minimum magnitude thought to be of engineering relevance causes a drastic increase of the hazard at small mean return periods.     

Optimal Control of Structures under Earthquakes Including Soil-Structure Interaction

It is well known that the soil-structure interaction (SSI) changes the dynamic response of a structure supported on flexible soil. The analysis of optimally controlled SSI systems has certain difficulties due to the nature of the SSI and the optimal control problem. In this paper, a two-step iteration-based numerical algorithm is proposed to handle optimally controlled SSI systems under earthquakes. First, the optimal control forces are obtained by using a fixed-base system. Then, the optimal control forces are converted to the frequency domain by the Fourier transform technique to be used in the equations of the SSI system. The lateral displacement and the rocking of the foundation are obtained from the equations of the SSI system containing the optimal control forces in the frequency domain. The lateral displacement and rocking of the foundation are then converted to the time domain by the inverse Fourier transform technique, and the lateral accelerations and the rocking accelerations of the foundation are obtained by the forward finite difference method. During the second step, the optimal control forces are calculated again by using the lateral acceleration and the rocking acceleration of the foundation along with the earthquake ground motion. Using the method explained above, the optimal control forces obtained in the time domain are used in the equations of the soil-structure system from which the behavior of foundation and structure is obtained. In the final section of the paper, a numerical study is conducted for a controlled structure supported on flexible soil.     

Definitions of Turkish in‐group boundaries: national participation and essentialism as predictors of inter‐group attitudes in Turkey

The present research investigates how definitions of national in‐group boundaries predict inter‐group attitudes in Turkey. In Study 1, we explore definitions of Turkish in‐group boundaries as well as perceptions of the Turkish in‐group's relations with other groups among 64 university students. In Study 2, conducted among 324 university students, exploratory factor analyses reveal two dimensions of Turkish in‐group boundaries: national participation (a more civic definition) and national essentialism (a more ethnic definition). They also reveal four dimensions of the relations with others. Regression analyses show that national participation predicts more negative inter‐group attitudes. However, national essentialism is not found to predict the inter‐group attitudes. These results are compared with those of previous studies, mostly conducted in Western countries. The comparison suggests that conclusions about the positive role of Civic and the negative role of Ethnic/Cultural definitions in intergroup relations may be less general than is previously thought.