Dissipation and elliptic flow at RHIC

We compare elliptic flow evolution from ideal hydrodynamics and covariant parton transport theory, and show that, for conditions expected at RHIC, dissipation significantly reduces elliptic flow even for extreme parton cross sections and/or densities sigma_gg * dN/d\eta(b=0) ~ 45 mb * 1000. The difference between transport and hydrodynamic elliptic flow is established rather early during the evolution of the system, but the buildup of elliptic flow is surprisingly insensitive to the choice of the initial (formation or thermalization) time in both models.Comment: 4 pages, 3 EPS fig

Fidelity preserving maps on density operators

We prove that any bijective fidelity preserving transformation on the set of all density operators on a Hilbert space is implemented by an either unitary or antiunitary operator on the underlying Hilbert space.Comment: This is corrected version of the paper math.OA/0108060. The paper has already appeared in ROMP (vol. 48 (2001), 299-303

Preserving the measure of compatibility between quantum states

In this paper after defining the abstract concept of compatibility-like functions on quantum states, we prove that every bijective transformation on the set of all states which preserves such a function is implemented by an either unitary or antiunitary operator.Comment: 11 pages, submitted for publicatio

An extension of a characterization of the automorphisms of Hilbert space effect algebras

The aim of this paper is to show that if an order preserving bijective transformation of the Hilbert space effect algebra also preserves the probability with respect to a fixed pair of mixed states, then it is an ortho-order automorphism. A similar result for the orthomodular lattice of all sharp effects (i.e., projections) is also presented.Comment: 12 pages, to appear in Rep. Math. Phy

The Country-specific Organizational and Information Architecture of ERP Systems at Globalised Enterprises

The competition on the market forces companies to adapt to the changing environment. Most recently, the economic and financial crisis has been accelerating the alteration of both business and IT models of enterprises. The forces of globalization and internationalization motivate the restructuring of business processes and consequently IT processes. To depict the changes in a unified framework, we need the concept of Enterprise Architecture as a theoretical approach that deals with various tiers, aspects and views of business processes and different layers of application, software and hardware systems. The paper outlines a wide-range theoretical background for analyzing the re-engineering and re-organization of ERP systems at international or transnational companies in the middle-sized EU member states. The research carried out up to now has unravelled the typical structural changes, the models for internal business networks and their modification that reflect the centralization, decentralization and hybrid approaches. Based on the results obtained recently, a future research program has been drawn up to deepen our understanding of the trends within the world of ERP systems.Information System; ERP; Enterprise Resource Planning; Enterprise Architecture; Globalization; Centralization; Decentralization; Hybrid

About the interbank HUF liquidity – what does the MNB’s new liquidity forecast show?

Based on the decision of the Monetary Council of 6 September 2010, the MNB began publishing its HUF liquidity forecast. The central bank has been preparing forecasts on the liquidity of the banking system for internal use for a long time, but from now on it will share these with market participants on a weekly basis, before the MNB bond auction on Tuesday. With this publication, the central bank tries to ensure – by supporting the liquidity planning of credit institutions – that the volume of the base instrument, the two-week MNB bond is as close to the ideal quantity as possible, i.e. to reduce the reliance of participants on the availability of the overnight loans and deposits of the central bank. The latter may divert the market interest rates from the level close to the base rate of the central bank. Publication may also reduce the uncertainty of liquidity managers in the banking system and encourage them to use the interbank markets more actively. The MNB’s information advantage, which is the result of the existing institutional relations and the greater resources than those of the market actors, is another factor supporting the publication of the forecast. Although the central bank’s forecast cannot project the HUF liquidity of the banking system accurately, it still contains a considerable amount of additional information for credit institutions. With this publication, the MNB will disclose, at 10 o’clock on Tuesdays, before to the central bank bond auction, the average inter-bank HUF liquidity expected over the next week based on Tuesday.central bank balance sheet, autonomous factors, interbank deposit market, forecast of liquidity factors, demand on cash, central bank profit