6,131 research outputs found
Zygmunt Bauman’s Ethical Warnings in the Area of Economics. The Third Millennium’s Perspective
Zygmunt Bauman is not only a sociologist and philosopher reputable in the world
of science, he is also a father figure for people interested in the phenomenon of
globalization. Bauman investigates how current economic and political changes
influence the lives of particular societies. It was important to underline that also
economists can make use of Bauman’s ideas but with a few reservations That is
why the following crucial areas were proposed relating to economic aspects: the
meaning of consumptionism and wastage; global inequalities; the reasons and
consequences of the global economic crisis, and some heterodox matters such as
happiness, welfare, and well-being, all of which can be helpful in understanding
the multidimensional globalization process
When atomic-scale resolution is not enough: Spatial effects in in situ model catalyst studies
We investigate transport effects in in situ studies of defined model
catalysts using a multi-scale modeling approach integrating first-principles
kinetic Monte Carlo simulations into a fluid dynamical treatment. We
specifically address two isothermal flow setups: i) a channel flow with the
gas-stream approaching the single crystal from the side, as is representative
for reactor scanning tunneling microscopy experiments; and ii) a stagnation
flow with perpendicular impingement. Using the CO oxidation at RuO2 (110) as
showcase we obtain substantial variations in the gas-phase pressures between
the inlet and the catalyst surface. In the channel geometry the mass transfer
limitations lead furthermore to pronounced lateral changes in surface
composition across the catalyst surface. This prevents the aspired direct
relation between activity and catalyst structure. For the stagnation flow the
lateral variations are restricted to the edges of the catalyst. This allows to
access the desired structure-activity relation using a simple model.Comment: 22 pages, 7 figure
Low-energy modes of spin-imbalanced Fermi gases in BCS phase
The low-energy modes of a spin-imbalanced superfluid Fermi gas in the
Bardeen-Cooper-Schrieffer (BCS) side are studied. The gas is assumed to be
sufficiently dilute so that the pairing of atoms can be considered effective
only in s-wave between fermions of different internal state. The order
parameter at equilibrium is determined by the mean-field approximation, while
the properties of the collective modes are calculated within a Gaussian
approximation for the fluctuations of the order parameter. In particular we
investigate the effects of asymmetry between the populations of the two
different components and of temperature on the frequency and damping of
collective modes. It is found that the temperature does not much affect the
frequency and the damping of the modes, whereas an increase of the imbalance
shifts the frequency toward lower values and enhances the damping sensitively.
Besides the Bogoliubov-Anderson phonons, we observe modes at zero frequency for
finite values of the wave-number. These modes indicate that an instability
develops driving the system toward two separate phases, normal and superfluid.Comment: 7 pages, 4 figures, submitted to European Physical Journal D for
publicatio
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