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Sökning: WFRF:(Medvedev Sergei)

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1.
  • de Jong, Yde, et al. (författare)
  • PESI - a taxonomic backbone for Europe
  • 2015
  • Ingår i: Biodiversity Data Journal. - 1314-2836 .- 1314-2828. ; 3, s. 1-51
  • Tidskriftsartikel (refereegranskat)abstract
    • Reliable taxonomy underpins communication in all of biology, not least nature conservation and sustainable use of ecosystem resources. The flexibility of taxonomic interpretations, however, presents a serious challenge for end-users of taxonomic concepts. Users need standardised and continuously harmonised taxonomic reference systems, as well as high-quality and complete taxonomic data sets, but these are generally lacking for non-specialists. The solution is in dynamic, expertly curated web-based taxonomic tools.The Pan-European Species-directories Infrastructure (PESI) worked to solve this key issue by providing a taxonomic e-infrastructure for Europe. It strengthened the relevant social (expertise) and information (standards, data and technical) capacities of five major community networks on taxonomic indexing in Europe, which is essential for proper biodiversity assessment and monitoring activities. The key objectives of PESI were: 1) standardisation in taxonomic reference systems, 2) enhancement of the quality and completeness of taxonomic data sets and 3) creation of integrated access to taxonomic information.This paper describes the results of PESI and its future prospects, including the involvement in major European biodiversity informatics initiatives and programs.
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2.
  • Gambarato, Renira R., et al. (författare)
  • Fish Fight : Transmedia Storytelling Strategies for Food Policy Change
  • 2015
  • Ingår i: International Journal of E-Politics. - : IGI Global. - 1947-9131 .- 1947-914X. ; 6:3, s. 43-59
  • Tidskriftsartikel (refereegranskat)abstract
    • The 2010–2013 Fish Fight campaign, produced by Channel 4 in the United Kingdom and hosted by chef Hugh Fearnley-Whittingstall, is a transmedia experience designed to (1) draw the public's attention to the reckless discarding of caught fish because of the quota system intended to conserve fish stocks in the domain of the European Union; and to (2) pressure the authorities to change the European Common Fisheries Policy. The article analyzes the transmedia strategies of the Fish Fight campaign in order to demonstrate how the multiplatform media production contributed to (1) make the public aware of the wasteful discarding of healthy fish at sea under the European fishing quotas; and (2) to amend the European Union's fishing policies. The research findings point to the effective role of transmedia storytelling strategies in raising awareness in the political sphere through public participation in supporting relevant issues, influencing policy change.
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3.
  • Medvedev, Sergei (författare)
  • Thin sheet approximations for geodynamic applications
  • 1998
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Thin sheet approximations are widely used in geodynamics because of their potential for fast computing of 3D lithospheric deformations using simple numerical techniques. However, this simplicity imposes limits to boundary conditions, rheological settings and accuracy of results. The thesis argued here is that thin sheet approximations are powerful tools in geodynamic modelling and their current limitations are not necessary. To support this thesis the following theoretical investigations are provided:previous approximations are classified and their restrictions and advantages are discussed;scaling analysis of balance of forces is performed for application of an asymptotic technique based on the thickness/width ratio; two steps in the asymptotic analysis results in exact balance of forces integrated through the thickness of the thin sheet;the model is based on creep rheology although rheological variations are possible.Fundamental rebuilding of thin sheet approximation on the basis of higher order analysis expands the low order asymptotic background of previous approaches and results in the new Extended Thin Sheet Approximation (ETSA). This ETSA includes a set of 2D equations expressing the integrated balance of forces and rules for reconstruction of 3D stresses and velocities.The new approach retains the simplicity of numerical techniques requited for thin sheet approximations, while broadening their geodynamic applications because of the following points:special investigations found no limitations to possible boundary conditions;the unification behind ETSA allows significant rheological stratification in thin sheets;ETSA demonstrated it's potential by modelling the development of lithospheric instabilities in conditions that were not tractable to previous thin sheet approximations;comparisons with exact analytical solutions demonstrate high accuracy of ETSA.These conclusions are supported by examples of analytical investigations based on the ETSA and analyses of analogue models and field observations. The new computer code, SIMPLE, based on the ETSA, was designed using the simplest numerical techniques to model deformations in a lithosphere with strong rheological layering.
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4.
  • Sokoutis, Dimitrios, et al. (författare)
  • Indentation of a continent with a built-in thickness change : experiment and nature
  • 2000
  • Ingår i: Tectonophysics. - 0040-1951 .- 1879-3266. ; 320:3-4, s. 243-270
  • Tidskriftsartikel (refereegranskat)abstract
    • Orogens oblique to the direction of plate convergence are currently attributed to obliquity between the margins of one or both of the sutured continents to their direction convergence. We use a single analogue experiment and natural examples to illustrate a potential additional factor: variations in strength of the indented continent at a high angle to the convergence direction. The wavelengths of structures in laterally shortened lithosphere depend on the strength of the most competent layers. Lateral variations in crustal thickness must therefore lead to structures oblique to any applied lateral compression.An analogue experiment was performed to explore this phenomenon. A two-layer ‘indented continent’ was modelled by a brittle upper crust of sand above a lower crust of high-viscosity polymer floating on a single layer of low-viscosity syrup representing the mantle. The well-known strike-slip structures allowing lateral escape to distant weak boundaries were hindered by lateral boundaries in front of the indenter. This allowed us to focus on the effects of a thickness change built into the ‘indented continent’ along a zone parallel to the direction in which a vertical rigid wall advancing at a steady rate represented the indenter. Vertical escape led to an ‘orogenic belt’ oblique to the advancing wall; this obliquity influences subsequent lateral escape. Model scaling and interpretations are based on Extended Thin Sheet Approximation (ETSA) and standard theories of faulting.Four sectors of the Alpine–Himalayan orogen (Iran, Tunisia, the Eastern Alps and the Himalaya) are oblique to the continental convergence direction, and we point to thickness changes at high angles to the suture that may account for this geometry. As crustal thicknesses north of oblique sectors of the Himalayas are not yet known, we speculate on them.We infer from the main difference between our experiment and all our examples chosen from nature that vertical orogenic escape was oblique to our model suture but can be parallel to natural sutures.
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5.
  • Yadykin, Dimitriy, 1977, et al. (författare)
  • Verification of the equilibrium and MHD stability codes within the Integrated Tokamak Modeling Task Force framework.
  • 2013
  • Ingår i: 40th EPS Conference on Plasma Physics, EPS 2013; Espoo; Finland; 1 July 2013 through 5 July 2013. - 2914771843 ; 2, s. 1466-1469
  • Konferensbidrag (refereegranskat)abstract
    • Validation of the numerical tools used for modeling of the fusion plasma is an important step in the interpretation of experimental results. As several codes are usually used in the fusion community to model the same plasma processes, prior verification of the codes should be done in order to avoid discrepancies in the results treatment. Often numerical codes use different post- and pre-processing routines, coordinate system conventions, etc. These make such comparison complicated.One of the main efforts within the Integrated Tokamak Modeling Task Force (ITM TF) project is the verification and validation of the existing numerical tools on the existing tokamak experiments. The framework is developed in ITM that provides common standard interfaces for accessing, storing and exchanging data. All codes integrated in ITM framework use this common interface which makes verification process straightforward. Analysis of the plasma equilibrium and MHD stability is one of the subjects covered by the ITM. Several equilibrium and MHD stability codes are integrated in the ITM framework presently. Initial verification of the fixed-boundary equilibrium codes CHEASE, HELENA, SPIDER was performed using Tore Supra equilibrium reconstructed with EQUAL code. The compared profiles used as input to the MHD stability and transport codes are in agreement. In this work reconstruction of the JET equilibrium will be used for further verification of the equilibrium codes. Equilibrium unstable to the internal or external kink modes will be used for the verification of the MHD stability codes MARS, MARS-F, KINX. ITM tools will be highlighted available in the area of the equilibrium reconstruction and MHD stability analysis.
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