ODESSA

About: ODESSA is a based out in . It is known for research contribution in the topics: Population & Stars. The organization has 8058 authors who have published 8092 publications receiving 63228 citations.

The influence of grain shape, friction and cohesion on granular compaction dynamics.

Abstract: This article is a review of our recent and new experimental works on granular compaction. The effects of various microscopic parameters on the compaction dynamics are addressed, in particular the influence of the grain shape, the friction and the cohesion between the grains. Two dimensionnal and three dimensionnal systems are analysed. And the role of dimensionality will be emphasized. Theoretical and numerical investigations provide additional informations about that phenomenon. Indeed numerical models permit us to study the influence of some parameters not easily accessible experimentally. Our results show that the above mentioned parameters have a deep impact on the compaction dynamics. Anisotropic grains lead to two different compaction regimes separated by a “burst" of the packing fraction. Friction is observed to modify how the grains are arranged in the pile. This is confirmed by numerical simulations. Cohesive forces between particles inhibit compaction and lead to extremely low values of the packing fraction.

DC strong field stark effect for nonhydrogenic atoms: Consistent quantum mechanical approach

Abstract: A DC Stark effect for nonhydrogenic atoms in an external uniform electric field is calculated within a consistent quantum mechanical approach: the modified operator perturbation theory. The positions of the high-excited Stark resonances for the Na atom are calculated in good agreement with known experimental data.

LTSER platforms as a place-based transdisciplinary research infrastructure: learning landscape approach through evaluation

Abstract: Place-based transdisciplinary research involves multiple academic disciplines and non-academic actors. Long-Term Socio-Ecological Research (LTSER) platform is one concept with ~ 80 initiatives globally. As an exercise in learning through evaluation we audited (1) the siting, construction and maintenance of individual LTSER platforms, and (2) them as a distributed infrastructure for place-based transdisciplinary research with focus on the European continent. First, we defined a normative model for ideal performance at both platform and network levels. Second, four surveys were sent out to the 67 self-reported LTSER platforms officially listed at the end of 2016. Third, with a focus on the network level, we analyzed the spatial distribution of both long-term ecological monitoring sites within LTSER platforms, and LTSER platforms across the European continent. Fourth, narrative biographies of 18 platforms in different stages of development were analyzed. While the siting of LTSER platforms represented biogeographical regions well, variations in land use history and democratic governance were not well represented. Platform construction was based on 2.1 ecological monitoring sites, with 72% ecosystem and 28% social system research. Maintenance of a platform required three to five staff members, focused mostly on ecosystem research, was based mainly on national funding, and had 1–2 years of future funding secured. Networking with other landscape approach concepts was common. Individually, and as a network, LTSER platforms have good potential for transdisciplinary knowledge production and learning about sustainability challenges. To improve the range of variation of Pan-European social–ecological systems we encourage interfacing with other landscape approach concepts.

Market-based health care reforms in Central and Eastern Europe: lessons after ten years of change:

Abstract: After 1989, all Central and Eastern European (CEE) countries implemented large- scale health care reforms. The changes differ among CEE countries, depending very much on the specific conditions present at the start of and during the processes. However, there are some common issues — most notably, the introduction of several market-based instruments, including introducing health insurance financing systems to replace general taxation-based models, privatiza- tion and the introduction of private payments and co-payments. Much was expected as the outcome of the changes. However, recent evidence indicates that many expectations from the 'marketization' of health care were not fulfilled. Such failures confirm that the transformation processes in CEE countries cannot be based just on the simple transfer of western good practice. The success of the implementation of new approaches has been a function of the effective combi- nation of western and local expertise and the respecting of the specific local environment. One must be able to predict (as much as possible) the impact of new mechanisms in specific transitional conditions. The inability to do this has come at great cost to the citizens of the region.