Hamiltonian models for the propagation of irrotational surface gravity waves over a variable bottom

A single incompressible, inviscid, irrotational fluid medium bounded by a free surface and varying bottom is considered. The Hamiltonian of the system is expressed in terms of the so-called Dirichlet-Neumann operators. The equations for the surface waves are presented in Hamiltonian form. Specific scaling of the variables is selected which leads to approximations of Boussinesq and KdV types taking into account the effect of the slowly varying bottom. The arising KdV equation with variable coefficients is studied numerically when the initial condition is in the form of the one soliton solution for the initial depth.Comment: 18 pages, 6 figures, 1 tabl

Realized Volatility and Asymmetries in the A.S.E. Returns

Using a newly developed dataset of daily, value-weighted market returns we construct and analyze the monthly realized volatility of the Athens Stock Exchange (A.S.E.) from 1985 to 2003. Our analysis focuses on the distributional and time series properties of the realized volatility series and on assessing the connection between realized volatility and returns. In particular, we find strong evidence on the existence of a volatility feedback effect and the leverage effect, and on the existence of asymmetries between lagged returns and volatility. Furthermore, we examine the cross-sectional distribution of unconditional loadings on the realized risk factor(s) for different sets of characteristics-sorted common stock portfolios. We find that realized risk is a significantly priced factor in A.S.E. and its high explanatory power for the cross- section of portfolio average returns is independent of any return variation related to the market (CAPM) or size and book-to-market (Fama- French) factors. We discuss our findings in the context of the recent literature on realized volatility and feedback effects, as well as the literature on the pricing power of realized risk.realized volatility, leverage effect, volatility feedback effect, asset pricing, A.S.E.

Post-socialist narratives of being, belonging and becoming: Eastern European women migrants and transformative politics in an era of European crises

This paper draws from an oral history project on ‘Gendered Histories of Resilience and Resistance: Eastern European Women’s Narratives of Mobility and Survival’, which is a narrative ethnography of Albanian, Bulgarian, Romanian and Polish migrant women living in Greece. The paper explores these women’s life stories, memories and experiences, in both their ancestral homelands as well as country of settlement, in order to examine the intersections of gender and identity in how the recollection of socialist pasts informs the understanding of living present and future capitalist lives. The diverse, compelling but also competing accounts of women’s childhood and early adult lives in socialist times in their Eastern European countries of origin is an intriguing way to explore issues of being, belonging and becoming. Discussions on feminism and identity are also revealing as they highlight the discourses and political projects at the intersections of personal experiences with broader socio-cultural and economic fields, in particular as regards the context of migration and the current crisis in Greece

'A window to knowledge is a window to the world': socio-aesthetics, ethics and pedagogic migrant youth journeys in crisis-shaped educational settings in Greece

This paper explores the processes, tensions, opportunities and constraints that migrant youth in Greek higher educational institutions experience at the present time which are characterised by social crises, economic austerity and political instability. In doing so, we also put forward an agenda of critical and feminist pedagogies in developing inclusive spaces of educational citizenship and social justice. Building on a larger collaborative study on youth and migration, this paper draws on a sample of 130 interviews with women and men second generation migrants who are currently, or have been in the past, university students at various institutions in Greece. Migrant youth expanding on their aspirations and capacities harness a developmental pathway of cosmopolitan pedagogies which alter their circumstances and social possibilities. The paper advances alternative discourses in crafting spaces of anti-oppression in the academy through a feminist lens which will cultivate learning communities of equity, justice and reflexivity

Diasporic youth identities of uncertainty and hope: second-generation Albanian experiences of transnational mobility in an era of economic crisis in Greece

This paper explores various dimensions of ‘gender’ and ‘mobility’ among immigrant youth from a transnational perspective in an era of economic crisis. The extent and parameters of continuity, contestation and change in migrant youth identities are analysed and we suggest that neither gender nor identity are stable categories but are embedded in sociocultural particularities both in the country of residence (Greece) but also in the country of origin (Albania). Through in-depth interviews with 52 participants, all second-generation Albanian immigrants in Greece born to two Albanian parents, the paper addresses youth identification in relation to gendered representations of belonging. The narrative accounts that we have selected and analysed reflect the emotional challenges, constraints and creativity of Albanian youth

East European migrant women in Greece: intergenerational cultural knowledge transfer and adaptation in a context of crisis

This paper draws on a larger oral history project entitled ‘Gendered Histories of Resilience and Resistance: Eastern European Women’s Narratives of Mobility and Survival’, a narrative ethnography of Albanian, Bulgarian, Romanian, and Polish immigrant women living in Greece. The paper explores intergenerational cultural knowledge transfer and adaptation in a context of crisis with an analysis contextualised within the current crisis in Greece. We consider here the degree of uncertainty and the emotional challenges and constraints, but consider also the creativity and agency that participants display. Following on from that we aim to unravel the impact of ‘family and cultural values’ on migrants’ everyday lives in the diaspora

Youth mobilities, crisis, and agency in Greece: second generation lives in liminal spaces and austere times

This paper explores various dimensions of “mobility” and “agency” among second-generation immigrants in Greece who have experienced the economic crisis throughout their studies at Higher Education Institutions. Following their studies in Greece, second-generation youth migrants graduated at a time when the crisis had already been leading hundreds of thousands of mostly highly skilled Greeks to emigration, resulting in a severe “brain drain” for Greece. First-generation immigrants’ investment in their children’s education has been vital as an integration strategy and as a means of achieving social mobility. It has also been an asset during crisis times when the prospect of re-migration seems more than a possible option setting new challenges for youth mobility on a local, global, and transnational level. Nevertheless, the vast majority of our participants manifest their will to remain in Greece and struggle for their future in the host country. Through in-depth interviews with 130 participants, all second-generation Albanian, Bulgarian, and Romanian immigrants in Greece, 30 born in the host country and the rest in the country of origin, the paper addresses youth agency in relation to geographical mobility, education, and personal development

On reductions of soliton solutions of multi-component NLS models and spinor Bose-Einstein condensates

We consider a class of multicomponent nonlinear Schrodinger equations (MNLS) related to the symmetric BD.I-type symmetric spaces. As important particular case of these MNLS we obtain the Kulish-Sklyanin model. Some new reductions and their effects on the soliton solutions are obtained by proper modifying the Zakahrov-Shabat dressing method.Comment: AIP AMiTaNS'09 Proceedings

When the purpose lies within: Maximizers and satisfaction with autotelic choices

Are maximizers less satisfied with their choices than satisficers? This research provides a novel perspective on this question by distinguishing between two types of consumer goals: autotelic, when choice is a goal in itself, and instrumental, when a choice is a means to achieving other goals. Study 1 showed that maximizers value autotelic experiences more than satisficers. Study 2 experimentally manipulated the choice goal and found that maximizers compared to satisficers experience higher choice satisfaction when the choice goal is autotelic rather than instrumental. Additionally, evidence is provided for the underlying mechanism (perceived ease of choice) as well as downstream consequences (consumers' willingness to pay for their chosen option). These findings advance a conceptualization of maximizers as consumers seeking self-contained meaning in choice and provide new insights into the relation between maximizing and choice satisfaction. Theoretical and practical implications for consumer decision-making are discussed