The Provision of Social Benefits in State Owned

We use evidence from a survey of approximately 200 Polish state-owned, privatized, and de novo private manufacturing firms to investigate the nature and scope of enterprises-level provision of social benefits, and in particular how enterprise-level social provision is changing with transition, privatization and the emergence of the new private sector. We find that social provision remains surprisingly widespread, and has not been greatly reduced in either the state-owned or the privatized sectors. De novo private firms offer a substantially smaller but still significant range of social provision aside from ownership form are firm sized and employee power ( the latter are not explicitly via the union structure), both of which are associated with higher levels of social provision. Money wages and the provision of social benefits appear to be complementary rather than substitutes. Assets used for the provision of social benefits are concentrated in state-owned firms, but there is relatively little social asset disposal; the de novo private sector is expanding the range of social benefits offered but is not investing significantly in social assets. Social provision has been declining in state-owned firms, less so in privatized firms, and increasingly (modestly) in new private firms. On average the declines determinants of the pace of change aside from ownership form are the size of the firm and its profitability, both of which are associated with increases or slower declines in social provision, in the case of the state-owned sector, provision also declines more slowly when they tax-based income policy (the "popwiek") binds.

Enterprise Adjustment in Poland: Evidence from a Survey of 200 Private

This paper reports the main findings from a survey of some 200 Polish firms carried out at the end of 1993. The central focus is on the relationship between different emerging forms of ownership and the extent and nature of enterprise level adjustments taking place. Four broad categories of enterprises that distinguish the main ownership forms that characterize Polish industry were included in the survey: (a) traditional state-owned enterprises, (b) corporatized state-owned enterprises that have been converted into joint stock companies but whose shares are now owned by the State Treasury; (c) former state-owned firms that have been privatized; and (d) privately-owned firms which were established de novo. Some of the main findings from the survey are as follows. Growth and investment in 1993 were widely diffused through the economy, but rather more concentrated in the private sector and especially in de novo private firms, while financial distress as revealed by low profit margins was concentrated in the state-owned sector. The survey suggests that all firms in Poland have experienced a considerable increase in competition, and have faced the need radically to restructure their patterns of input purchases and marketing strategy. In general, de novo private firms have led the way, and changes have been fewer and less deep in the state-owned sector. Developments on the labor side in our sample are rather modest, and to be heavily oriented to satisfy the preferences of insiders, especially workers. Overmanning remains rife in both the state-owned and privatized sector, and differences between the two groups of firms in wage determination appear to stem more from the operation of the excess wage tax than from differences in motivation. Behavior in the de novo private firms is, however, clearly different, with a concern to hire not fire, and with lower employee influence. With respect to finance, we find that privatized and especially de novo private firms are financially relatively healthy, with higher profits and fewer bad debts than the state-owned firms. Although almost half of private sector firms hold no bank debt, bank credit is flowing fastest to these firms and in general they report the fewest problems in servicing it. Overdue trade credit is common among all ownership groups but more so among state firms; however, the flow problem is not serious, and volumes of total and overdue trade credit are comparable to West European levels. The main method by which severely financially-distressed firms, nearly all of which are state-owned, finance their losses is by running up tax arrears; financing by banks and by trade credit is much less significant.

Chemostratigraphy of Neoproterozoic carbonates: implications for 'blind dating'

The delta C-13(carb) and Sr-87/Sr-86 secular variations in Neoproteozoic seawater have been used for the purpose of 'isotope stratigraphy' but there are a number of problems that can preclude its routine use. In particular, it cannot be used with confidence for 'blind dating'. The compilation of isotopic data on carbonate rocks reveals a high level of inconsistency between various carbon isotope age curves constructed for Neoproteozoic seawater, caused by a relatively high frequency of both global and local delta C-13(carb) fluctuations combined with few reliable age determinations. Further complication is caused by the unresolved problem as to whether two or four glaciations, and associated negative delta C-13(carb) excursions, can be reliably documented. Carbon isotope stratigraphy cannot be used alone for geological correlation and 'blind dating'. Strontium isotope stratigraphy is a more reliable and precise tool for stratigraphic correlations and indirect age determinations. Combining strontium and carbon isotope stratigraphy, several discrete ages within the 590-544 Myr interval, and two age-groups at 660-610 and 740-690 Myr can be resolved

Dzyaloshinskii-Moriya interaction in NaV2_2O5_5: a microscopic study

We present a unified account of magnetic exchange and Raman scattering in the quasi-one-dimensional transition-metal oxide NaV$_2$O$_5$. Based on a cluster-model approach explicit expressions for the exchange integral and the Raman-operator are given. It is demonstrated that a combination of the electronic-structure and the Dzyaloshinskii-Moriya interaction, allowed by symmetry in this material, are responsible for the finite Raman cross-section giving rise to both, one- and two-magnon scattering amplitudes.Comment: 7 pages, 1 figur

HARES: an efficient method for first-principles electronic structure calculations of complex systems

We discuss our new implementation of the Real-space Electronic Structure method for studying the atomic and electronic structure of infinite periodic as well as finite systems, based on density functional theory. This improved version which we call HARES (for High-performance-fortran Adaptive grid Real-space Electronic Structure) aims at making the method widely applicable and efficient, using high performance Fortran on parallel architectures. The scaling of various parts of a HARES calculation is analyzed and compared to that of plane-wave based methods. The new developments that lead to enhanced performance, and their parallel implementation, are presented in detail. We illustrate the application of HARES to the study of elemental crystalline solids, molecules and complex crystalline materials, such as blue bronze and zeolites.Comment: 17 two-column pages, including 9 figures, 5 tables. To appear in Computer Physics Communications. Several minor revisions based on feedbac

Current status of turbulent dynamo theory: From large-scale to small-scale dynamos

Several recent advances in turbulent dynamo theory are reviewed. High resolution simulations of small-scale and large-scale dynamo action in periodic domains are compared with each other and contrasted with similar results at low magnetic Prandtl numbers. It is argued that all the different cases show similarities at intermediate length scales. On the other hand, in the presence of helicity of the turbulence, power develops on large scales, which is not present in non-helical small-scale turbulent dynamos. At small length scales, differences occur in connection with the dissipation cutoff scales associated with the respective value of the magnetic Prandtl number. These differences are found to be independent of whether or not there is large-scale dynamo action. However, large-scale dynamos in homogeneous systems are shown to suffer from resistive slow-down even at intermediate length scales. The results from simulations are connected to mean field theory and its applications. Recent work on helicity fluxes to alleviate large-scale dynamo quenching, shear dynamos, nonlocal effects and magnetic structures from strong density stratification are highlighted. Several insights which arise from analytic considerations of small-scale dynamos are discussed.Comment: 36 pages, 11 figures, Spa. Sci. Rev., submitted to the special issue "Magnetism in the Universe" (ed. A. Balogh

On Physical Equivalence between Nonlinear Gravity Theories

We argue that in a nonlinear gravity theory, which according to well-known results is dynamically equivalent to a self-gravitating scalar field in General Relativity, the true physical variables are exactly those which describe the equivalent general-relativistic model (these variables are known as Einstein frame). Whenever such variables cannot be defined, there are strong indications that the original theory is unphysical. We explicitly show how to map, in the presence of matter, the Jordan frame to the Einstein one and backwards. We study energetics for asymptotically flat solutions. This is based on the second-order dynamics obtained, without changing the metric, by the use of a Helmholtz Lagrangian. We prove for a large class of these Lagrangians that the ADM energy is positive for solutions close to flat space. The proof of this Positive Energy Theorem relies on the existence of the Einstein frame, since in the (Helmholtz--)Jordan frame the Dominant Energy Condition does not hold and the field variables are unrelated to the total energy of the system.Comment: 37 pp., TO-JLL-P 3/93 Dec 199

Opinion dynamics: models, extensions and external effects

Recently, social phenomena have received a lot of attention not only from social scientists, but also from physicists, mathematicians and computer scientists, in the emerging interdisciplinary field of complex system science. Opinion dynamics is one of the processes studied, since opinions are the drivers of human behaviour, and play a crucial role in many global challenges that our complex world and societies are facing: global financial crises, global pandemics, growth of cities, urbanisation and migration patterns, and last but not least important, climate change and environmental sustainability and protection. Opinion formation is a complex process affected by the interplay of different elements, including the individual predisposition, the influence of positive and negative peer interaction (social networks playing a crucial role in this respect), the information each individual is exposed to, and many others. Several models inspired from those in use in physics have been developed to encompass many of these elements, and to allow for the identification of the mechanisms involved in the opinion formation process and the understanding of their role, with the practical aim of simulating opinion formation and spreading under various conditions. These modelling schemes range from binary simple models such as the voter model, to multi-dimensional continuous approaches. Here, we provide a review of recent methods, focusing on models employing both peer interaction and external information, and emphasising the role that less studied mechanisms, such as disagreement, has in driving the opinion dynamics. [...]Comment: 42 pages, 6 figure

Leprosy perceptions and knowledge in endemic districts in india and indonesia: Differences and commonalities

Background Understanding how knowledge, attitudes and practices regarding leprosy differ in endemic countries can help us develop targeted educational and behavioural change interventions. This study aimed to examine the differences and commonalities in and determinants of knowledge, attitudes, practices and fears regarding leprosy in endemic districts in India and Indonesia. Principle findings A cross-sectional mixed-methods design was used. Persons affected by leprosy, their close contacts, community members and health workers were included. Through interview-administered questionnaires we assessed knowledge, attitudes, practices and fears with the KAP measure, EMIC-CSS and SDS. In addition, semi-structured interviews and focus group discussions were conducted. The quantitative data were analysed using stepwise multivariate regression. Determinants of knowledge and stigma that were examined included age, gender, participant type, education, occupation, knowing someone affected by leprosy and district. The qualitative data were analysed using open, inductive coding and content analysis. We administered questionnaires to 2344 participants (46% from India, 54% from Indone-sia) as an interview. In addition, 110 participants were interviewed in-depth and 60 participants were included in focus group discussions. Knowledge levels were low in both countries: 88% of the participants in India and 90% of the participants in Indonesia had inad-equate knowledge of leprosy. In both countries, cause, mode of transmission, early

Electronic structure of copper nitrides as a function of nitrogen content

he nitrogen content dependence of the electronic properties for copper nitride thin films with an atomic percentage of nitrogen ranging from 26 ± 2 to 33 ± 2 have been studied by means of optical (spectroscopic ellipsometry), thermoelectric (Seebeck), and electrical resistivity measurements. The optical spectra are consistent with direct optical transitions corresponding to the stoichiometric semiconductor Cu3N plus a free-carrier contribution, essentially independent of temperature, which can be tuned in accordance with the N-excess. Deviation of the N content from stoichiometry drives to significant decreases from − 5 to − 50 μV/K in the Seebeck coefficient and to large enhancements, from 10− 3 up to 10 Ω cm, in the electrical resistivity. Band structure and density of states calculations have been carried out on the basis of the density functional theory to account for the experimental results