1,865 research outputs found
Theoretical Investigation of Internal Rotation Barriers of 4-(Dimethylaminocinnamaldehyde)
Theoretical study on 4-dimethylaminocinnamaldehyde was done analyzing the barriers of rotation and interpretation of its Raman spectrum. B3LYP Density functional with basis sets up to 6-31G ** with additional f and d functions on C, N, O, and H respectively, calculations were performed. Results indicate trans conformation of the molecule had the lowest energy. Vibrational modes of interest were noted around 500, 1192, 1263, 1316, 1547, and 1608 cm-1. Observed strong enhancement at noted frequencies can be further studied in determining the molecule with other subatomic particles (Ag colloids)
Phase lagging model of brain response to external stimuli - modeling of single action potential
In this paper we detail a phase lagging model of brain response to external
stimuli. The model is derived using the basic laws of physics like conservation
of energy law. This model eliminates the paradox of instantaneous propagation
of the action potential in the brain. The solution of this model is then
presented. The model is further applied in the case of a single neuron and is
verified by simulating a single action potential. The results of this modeling
are useful not only for the fundamental understanding of single action
potential generation, but also they can be applied in case of neuronal
interactions where the results can be verified against the real EEG signal.Comment: 19 page
Boundary-induced phase transitions in a space-continuous traffic model with non-unique flow-density relation
The Krauss-model is a stochastic model for traffic flow which is continuous
in space. For periodic boundary conditions it is well understood and known to
display a non-unique flow-density relation (fundamental diagram) for certain
densities. In many applications, however, the behaviour under open boundary
conditions plays a crucial role.In contrast to all models investigated so far,
the high flow states of the Krauss-model are not metastable, but also stable.
Nevertheless we find that the current in open systems obeys an extremal
principle introduced for the case of simpler discrete models. The phase diagram
of the open system will be completely determined by the fundamental diagram of
the periodic system through this principle. In order to allow the investigation
of the whole state space of the Krauss-model, appropriate strategies for the
injection of cars into the system are needed.Two methods solving this problem
are discussed and the boundary-induced phase transitions for both methods are
studied.We also suggest a supplementary rule for the extremal principle to
account for cases where not all the possible bulk states are generated by the
chosen boundary conditions.Comment: 12 Pages, 14 figure
- …