New classes of exact solutions of three-dimensional Navier-Stokes equations

New classes of exact solutions of the three-dimensional unsteady Navier-Stokes equations containing arbitrary functions and parameters are described. Various periodic and other solutions, which are expressed through elementary functions are obtained. The general physical interpretation and classification of solutions is given.Comment: 11 page

Autothermal reforming of palm empty fruit bunch bio-oil: thermodynamic modelling

This work focuses on thermodynamic analysis of the autothermal reforming of palm empty fruit bunch (PEFB) bio-oil for the production of hydrogen and syngas. PEFB bio-oil composition was simulated using bio-oil surrogates generated from a mixture of acetic acid, phenol, levoglucosan, palmitic acid and furfural. A sensitivity analysis revealed that the hydrogen and syngas yields were not sensitive to actual bio-oil composition, but were determined by a good match of molar elemental composition between real bio-oil and surrogate mixture. The maximum hydrogen yield obtained under constant reaction enthalpy and pressure was about 12 wt% at S/C = 1 and increased to about 18 wt% at S/C = 4; both yields occurring at equivalence ratio Φ of 0.31. The possibility of generating syngas with varying H2 and CO content using autothermal reforming was analysed and application of this process to fuel cells and Fischer-Tropsch synthesis is discussed. Using a novel simple modelling methodology, reaction mechanisms were proposed which were able to account for equilibrium product distribution. It was evident that different combinations of reactions could be used to obtain the same equilibrium product concentrations. One proposed reaction mechanism, referred to as the ‘partial oxidation based mechanism’ involved the partial oxidation reaction of the bio-oil to produce hydrogen, with the extent of steam reforming and water gas shift reactions varying depending on the amount of oxygen used. Another proposed mechanism, referred to as the ‘complete oxidation based mechanism’ was represented by thermal decomposition of about 30% of bio-oil and hydrogen production obtained by decomposition, steam reforming, water gas shift and carbon gasification reactions. The importance of these mechanisms in assisting in the eventual choice of catalyst to be used in a real ATR of PEFB bio-oil process was discussed

Ideology and Utopia: Social Psychology and the Social Imaginary of Paul Ricoeur

In recent years we have witnessed a number of new developments in social psychology that set out to offer an alternative to the dominant social cognitive paradigm. Whilst there is undoubtedly growing interest in these alternatives, they have not had the impact that many might have hoped. In this paper, I outline Paul Ricoeur’s work on the social imaginary, ideology and utopia, and use this as a critical hermeneutic to understand the failure of ‘new movements’ within social psychology to move the discipline forward. The social imaginary is the ensemble of stories possessed by all societies that serve to mediate human reality. Ricoeur uses this concept to understand and conceptualize the distinction between ideology and utopia. Ideology and utopia are reconceptualized by Ricoeur as integration/identity and rupture/critique, respectively. I argue that social psychology vacillates between these two positions and, as yet, has not been able to engage dialectically with both

Citizenship ethics: German-Turkish return migrants, belonging, and justice

Due to copyright restrictions, the access to the full text of this article is only available via subscription.This article examines citizenship for German-Turkish return migrants attending monthly meetings of the Rückkehrer Stammtisch (Returner’s Meetings) in Istanbul. Meeting attendees call themselves “world citizens” and remain deeply concerned about disrespect and inequality they experience as ethnic minorities in Germany and as citizens in Turkey. Drawing on the anthropology of ethics, this research demonstrates the importance of ethical relationships for understanding these migrants’ experience of citizenship. Moving beyond work that views citizenship primarily in terms of state power and legal disciplining, this research demonstrates that citizenship for these migrants is focused heavily on an ethics of care and responsibility developed in the course of personal interactions with fellow citizens. This article also adds ethnographic specificity to the concepts of belonging and justice. It analyzes how ethical relationships established among meeting attendees confer feelings of comfort, intimacy, and a sense of shared humanity that structure migrants’ inclusion in national spaces.Fulbright-Hays DDRA Program ; Wenner-Gren Foundation for Anthropological Research ; American Research Institute in Turkey (ARIT) ; Institute of Turkish Studies (ITS) ; Social Science Research Council (SSRC) ; Center for German and European Studies (CGES) at the University of Wisconsin-Madiso

Prestige from the bottom up : a review of language planning in Guernsey.

This paper discusses language planning measures in Guernsey, Channel Islands. The indigenous language is spoken fluently by only 2% of the population, and is at level 7 on Fishman’s 8-point scale of endangerment. It has no official status and low social prestige, and language planning has little official support or funding. Political autonomy has not increased the language’s status or stopped intergenerational transmission from declining. Most language planning initiatives are very small-scale and are undertaken by pressure groups or individuals, who focus on social prestige at grass-roots level rather than official status. The likelihood of success of current efforts is evaluated