Mechanical instability is often harnessed in mechanical metamaterials to generate a diverse range of functionalities, and can be triggered by either or field stimulus, such as temperature. Existing field-responsive with snap-through instability, however, need rely on input realize functional reversibility, limitation depriving them the capacity operate solely via applied field. This work demons...

One of the problems that sometimes occur in gas allocation optimization is instability phenomenon. This phenomenon reduces the oil production and damages downhole and surface facilities. Different works have studied the stability and suggested some solutions to override it, but most of them (such as making the well intelligent) are very expensive and thus they are not applicable to many cases. ...

We review the renormalization group (RG) method for interacting fermions, building off typical φ theory to account for the presence of a Fermi surface. A few geometries and the general procedure are briefly discussed. The method is illustrated with a model of two Fermi circles with different spin components and momenta, which can describe experiments with interacting fermions. General results o...

The binding energy of a negatively charged hydrogenic impurity with onand offcenter position in a spherical Gaussian quantum dot was calculated with the configuraction interaction method. Our calculations show that Eb is always positive for on-center impurities with a maximum near to the radius for one-electron stability of the potential well Rc. For off-center positions the binding energy can ...

Proceeding from WKB quantization conditions, we derive a semiclassical expression for the current of fermions scattered off a propagating bubble wall in the presence of longitudinal gauge field. It agrees with the expression used by Nasser and Turok in semiclassical analysis of instability of electroweak bubble walls with respect to longitudinal Z condensation. We discuss the resulting dispersi...

The effect of the boundary conditions on the global dynamics of cellular neural networks (CNNs) is investigated. As a case study one dimensional template CNNs are considered. It is shown that if off-diagonal template elements have the same sign (i.e. the CNN is completely stable), then the qualitative dynamics is not influenced by the boundary conditions. If the off-diagonal template elements h...

power system blackouts have become a serious problem for electric utilities especially in recent years. different forms of system instability have emerged in recent blackouts, such as voltage instability and frequency instability. to counteract each form of system instability, special algorithms have been designed in the protection system, e.g. under frequency load shedding (ufls) and under vol...