8,304 research outputs found
Art for Social Change: Supporting Art for Community Building, New Philanthropic Orientations in Egypt
Taking stock of recent developments in the field of philanthropy concerning the theme of Art for Social Change, this paper shall analyze the new cultural and artistic trends in civic participation and social engagement in Egypt that take their root well before the revolution and could be further emphasized following the Uprisings. The focus will be on new philanthropic orientations fostering community based cultural expressions rather than 'elitist' art forms or already recognized performing artists (concerts, opera, and blockbuster films)
New Parametrizations for the Photon Structure Function
In the last year four new parametrizations of the Hadronic Photon Structure
Function at Next to Leading Order have appeared. In this talk, I briefly review
the main features of three of them: the FFNS_CJK, CJK and AFG.Comment: 7 pages, 2 figures. Talk presented at the Photon 2005 Conference,
Warsaw (Poland
The location of R&D in the Netherlands: trends, determinants and policy
Many factors determine the location of business R&D projects, the most important being history, the supply of R&D labour, and the quality of the public knowledge infrastructure (including the science-industry knowledge transfer). The set of R&D locations in the Netherlands changes little over time. But two things do change regularly: the size of the R&D activities at a particular site and the name and nationality of the owner of an R&D site. The Netherlands takes an average or higher position in a ranking of OECD countries according to attractiveness to the location of business R&D. Since domestic R&D is an important engine for domestic economic growth and since the market fails to provide optimal incentives for R&D, there is scope for government policy that improves upon the R&D location climate. Yet, this policy rationale does not necessarily imply that R&D policy initiatives are always effective and efficient: elasticities and social (opportunity) costs should be taken into account.
Existence of financial equilibria with restricted participation
We consider a two-date model of a financial exchange economy with finitely many agents having nonordered preferences and portfolio constraints. There is a market for physical commodities at any state today or tomorrow and financial transfers across time and across states are allowed by means of finitely many nominal assets or numeraire assets. We prove a general existence result of equilibria for such a financial exchange economy in which portfolios are defined by linear constraints, extending the framework of linear equality constraints by Balasko et al. (1990) and the existence results in the unconstrained case by Cass (1984, 2006), Werner (1985), Duffie (1987) and Geanakoplos and Polemarchakis (1986). Our main result is a consequence of an auxiliary result, also of interest for itself, in which agents' portofolio constraints are defined by general closed convex sets and the financial structure is assumed to satisfy a "nonredundancy-type" assumption, weaker than the ones in Radner (1972) and Siconolfi (1989).Restricted participation; portfolio constraints; financial exchange economy; equilibrium; existence; arbitrage-free asset prices
Existence of pseudo-equilibria in a financial economy
This paper proves the existence of a pseudo-equilibrium in a financial economy with incomplete markets in which the agents may have nonordered preferences. We will use a fixed-point-like theorem of Bich and Cornet that generalizes the results by Hirsch, Magill, Mas-Colell [18] and Husseini, Lasry, Magill [19] to encompass the framework considered by Gale and Mas-Colell ([14], [15]).Pseudo-equilibrium ; incomplete markets ; nonordered preferences ; fixed-point-like theorems ; Grassmann manifold
Existence of pseudo-equilibria in a financial economy
This paper proves the existence of a pseudo-equilibrium in a financial economy with incomplete markets in which the agents may have nonordered preferences. We will use a fixed-point-like theorem of [4] that generalizes the results by Hirsch, Magill, Mas-Colell [18] and Husseini, Lasry, Magill [19] to encompass the framework considered by Gale and Mas-Colell ([14],[15]).Pseudo-equilibrium, incomplete markets, nonordered preferences, fixed-point-like theorems, Grassmann manifold.
The alternative approach to QCD analysis of the structure function F2gamma
The alternative approach to QCD analysis of the structure function F2gamma is
presented. It differs from the conventional one by the presence of the terms,
which in conventional approach appear in higher orders. The numerical results
show that this difference is nonnegligible and may play an important role in
the analysis on photon data of the future experiments.Comment: Talk given at PHOTON 2007, Paris, France, July 2007, 4 pages, 4
figure
Existence of financial equilibria with restricted participation
We consider a two-date model of a financial exchange economy with finitely many agents having nonordered preferences and portfolio constraints. There is a market for physical commodities at any state today or tomorrow and financial transfers across time and across states are allowed by means of finitely many nominal assets or num´eraire assets. We prove a general existence result of equilibria for such a financial exchange economy in which portfolios are defined by linear constraints, extending the framework of linear equality constraints by Balasko et al. (1990), and the existence results in the unconstrained case by Cass (1984, 2006), Werner (1985), Duffie (1987), and Geanakoplos and Polemarchakis (1986). Our main result is a consequence of an auxiliary result, also of interest for itself, in which agents’ portfolio constraints are defined by general closed convex sets and the financial structure is assumed to satisfy a ”nonredundancy-type” assumption, weaker than the ones in Radner (1972) and Siconolfi (1989).Restricted participation, portfolio constraints, financial exchange economy, equilibrium, existence, arbitrage-free asset prices
CJK-Improved 5 Flavour LO Parton Distributions in the Real Photon
Radiatively generated, LO quark (u,d,s,c,b) and gluon densities in the real,
unpolarized photon, improved in respect to our previous paper, are presented.
We perform three global fits to the F_2^gamma data, using the LO DGLAP
evolution equation. We improve the treatment of the strong coupling running and
used lower values of Lambda_QCD, as we have found that the too high values
adopted in the previous work caused the high chi^2 of the fits. In addition to
the modified FFNS_CJKL model, referred to as FFNS_CJK 1 we analyse a FFNS_CJK 2
model in which we take into account the resolved-photon heavy-quark
contribution. New CJK model with an improved high-x behavior of the
F_2^gamma(x,Q^2) is proposed. Finally, in the case of the CJK model we abandon
the valence sum rule imposed on the VMD input densities. New fits give chi^2
per degree of freedom about 0.25 better than the old results. All features of
the CJKL model, such as the realistic heavy-quark distributions, good
description of the LEP data on the Q^2 dependence of the F_2^gamma and on
F_2,c^gamma are preserved. Moreover we present results of an analysis of the
uncertainties of the CJK parton distributions due to the experimental errors.
It is based on the Hessian method used for the proton and very recently applied
for the photon by one of us. Parton and structure function parametrizations of
the best fits in both FFNS_CJK and CJK approaches are made accessible. For the
CJK model we provide also sets of test parametrizations which allow for
calculation of uncertainties of any physical value depending on the real photon
parton densities.Comment: 27 pages, 14 figures, FORTRAN programs available at
http://www.fuw.edu.pl/~pjank/param.htm
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