Re-enacting “Cossack roots”:embodiment of memory, history, and tradition among young people in southern Russia

This article draws upon ethnographic research which was conducted among young Cossacks (members of officially registered and informal Cossack clubs) in southern Russia. It presents young people’s participation in the Cossack “nativism” as a physical and material mode of socialization into the mnemonic community. The research puts forward an argument that such corporal and sensorial experiences is effective in recruiting some young members to the Cossack movement. At the same time, the performative character of neo-Cossack identity destabilizes contemporary Cossacks’ claims of authenticity related to the status of the legitimate heirs of historical Cossackdom. At the more general level of discussion this paper juxtaposes bodily activities, social memory, and revivalist discourses

Binary Classification of Heart Failures Using k-NN with Various Distance Metrics

Magnetocardiography is a sensitive technique of measuring low magnetic fields generated by heart functioning, which is used for diagnostics of large number of cardiovascular diseases. In this paper, k-nearest neighbor (k-NN) technique is used for binary classification of myocardium current density distribution maps (CDDM) from patients with negative T-peak, male and female patients with microvessels (diffuse) abnormalities and sportsmen, which are compared with normal control subjects. Number of neighbors for k-NN classifier was selected to obtain highest classification characteristics. Specificity, accuracy, precision and sensitivity of classification as functions of number of neighbors in k-NN are obtained for classification with several distance measures: Mahalanobis, Cityblock, Eucleadian and Chebyshev. Increase of the accuracy of classification for all groups up to 10% was obtained using Cityblock distance metric in binary k-NN classifier with 19 - 27 neighbors, comparing to other metrics. Obtained results are acceptable for further patient’s state evaluation

A proof-of-concept neural network for inferring parameters of a black hole from partial interferometric images of its shadow

We test the possibility of using a convolutional neural network to infer the inclination angle of a black hole directly from the incomplete image of the black hole's shadow in the $uv$-plane. To this end, we develop a proof-of-concept network and use it to explicitly find how the error depends on the degree of coverage, type of input and coverage pattern. We arrive at a typical error of $10^\circ$ at a level of absolute coverage $1\%$ (for a pattern covering a central part of the $uv$-plane), $0.3\%$ (pattern covering the central part and the periphery, the $0.3\%$ referring to the central part only), and $14\%$ (uniform pattern). These numbers refer to a network that takes both amplitude and phase of the visibility function as inputs. We find that this type of network works best in terms of the error itself and its distribution for different angles. In addition, the same type of network demonstrates similarly good performance on highly blurred images mimicking sources nearing being unresolved. In terms of coverage, the magnitude of the error does not change much as one goes from the central pattern to the uniform one. We argue that this may be due to the presence of a typical scale which can be mostly learned by the network from the central part alone.Comment: 12 pages, 10 figures. For the code and trained models, see https://bitbucket.org/cosmoVlad/neuro-rep

PRT simulation in an immersive virtual world

Immersive virtual world environments, such as Second LifeTM (SL), have the potential to dramatically improve the process of analyzing usability within technically correct system simulations, long before the system is built. We report our findings with the SL simulation of a Personal Rapid Transit (PRT) system. The SL model and simulation were done according to the original technical specifications. In interacting with this simulation, the system designers were able to identify several usability issues that would have gone unnoticed in a non-immersive simulation environment. Namely: (1) a problem with the design of the offramp to the station; (2) further requirements for the design of the top of the vehicles, so that the suspended track is out of direct sight of the people inside; (3) further safety requirements for dealing with unexpected obstacles along the path. While all of these issues would have been identified upon deployment of the physical prototype, the contribution of our work is to show how usability issues like these can now be identified much earlier, using simulations in a virtual world. Copyright © 2008 ICST

Unraveling the physics of the Yellowstone magmatic system using geodynamic simulations

The Yellowstone magmatic system is one of the largest magmatic systems on Earth, and thus an ideal location to study magmatic processes. Whereas previous seismic tomography results could only image a shallow magma reservoir, a recent study using more seismometers showed that a second and massive partially molten mush reservoir exists above the Moho (Huang et al., 2015). To understand the measurable surface response of this system to visco-elasto-plastic deformation, it is thus important to take the whole system from the mantle plume up to the shallow magma reservoirs into account. Here, we employ lithospheric-scale 3D visco-elasto-plastic geodynamic models to test the influence of parameters such as the connectivity of the reservoirs and rheology of the lithosphere on the dynamics of the system. A gravity inversion is used to constrain the effective density of the magma reservoirs, and an adjoint modeling approach reveals the key model parameters affecting the surface velocity. Model results show that a combination of connected reservoirs with plastic rheology can explain the recorded slow vertical surface uplift rates of around 1.2 cm/year, as representing a long term background signal. A geodynamic inversion to fit the model to observed GPS surface velocities reveals that the magnitude of surface uplift varies strongly with the viscosity difference between the reservoirs and the crust. Even though stress directions have not been used as inversion parameters, modeled stress orientations are consistent with observations. However, phases of larger uplift velocities can also result from magma reservoir inflation which is a short term effect. We consider two approaches: (1) overpressure in the magma reservoir in the asthenosphere and (2) inflation of the uppermost reservoir prescribed by an internal kinematic boundary condition. We demonstrate that the asthenosphere inflation has a smaller effect on the surface velocities in comparison with the uppermost reservoir inflation. We show that the pure buoyant uplift of magma bodies in combination with magma reservoir inflation can explain (varying) observed uplift rates at the example of the Yellowstone volcanic system

Dramatising Cultural Diversity: Youth Theatre as a Performance of Local Memory and Identity in a Multiethnic Environment

This article presents a comparative analysis of two ethnographic case studies conducted in local theatres in the Slovak town of Komárno and the British city of Coventry. These two locations are very different - one is a small town on the Slovak-Hungarian border and the other an urban centre in the Midlands region of Britain - and yet they are both characterised by the multiethnic and culturally diverse composition of their populations. The two youth theatres in question are also distinct in their genres: one bases its performances on folklore traditions, whereas the other is an avant-garde physical theatre. At the same time, the productions of both groups manifest a deep involvement in the representation of cultural heritage and the current social issues in their respective locations. Drawing on anthropological conceptualisations of theatre as a form of ritualised performance (see Turner, 1969, 1982; Schechner, 1985, 1993), this paper explores the processes and contexts of the enactment of past conflict and/or violence presented by the two theatrical groups in order to engage with traumatic events in local (and national) history. These processes, which embrace the values of cultural diversity and inclusion, are important for the construction of community identities. The liminality of ritualised performance enables actors and audiences to cross social (including ethnicity and class) and temporal boundaries. They reproduce memories of past violence to make sense of present tensions, such as growing nationalism and xenophobia, and to project their vision of the communal future. This often results in the contestation of the very meaning of place, community and belonging. Furthermore, the article demonstrates that such artistic interpretations of the local past and heritage are instrumental in shaping the identities of the participating youth. the comparison of the two cases also reveals noticeable differences between cosmopolitan and ethno-cultural discourses, which are prevalent in imagining the place, history and heritage of Coventry and Komárno respectively