Power system stabilizers have been widely used and successfully implemented for the improvement of power system damping. However, a fixed parameter power system stabilizer tends to be sensitive to variations in generator dynamics so that, for operating conditions away from those used for design, the effectiveness of the stabilizer can be greatly impaired. With the advent of microprocessor techn...

Power systems are subjected to low frequency disturbances that might cause loss of synchronism and an eventual breakdown of entire system. The oscillations, which are typically in the frequency range of 0.2 to 3.0 Hz, might be excited by the disturbances in the system or, in some cases, might even build up spontaneously. These oscillations limit the power transmission capability of a network an...

current interests towards lowering fat content in food products and producing healthier and safer foods, have convinced ice cream manufacturers to substitute milk fat in ice cream with either carbohydrate or protein based fat replacers. in the present work, reduced-fat ice cream (5% fat) was produced using milk protein concentrate (65%) and inulin as fat replacers (0, 2 and 4%) as well as two t...

Hydroxypropyl cellulose (HPC) is a widely commercialized derivative. While it typically used as binder or stabilizer for foods and pharmaceuticals, can also form cholesteric liquid crystal in aqueous solution. Moreover, at high HPC concentrations this lyotropic thermotropic mesophase known to reflect structural color. However, remains challenge retain vibrant coloration into the solid state. He...

A complex projective t-design is a configuration of vectors which is “evenly distributed” on a sphere in the sense that sampling uniformly from it reproduces the moments of Haar measure up to order 2t. We show that the set of all n-qubit stabilizer states forms a complex projective 3-design in dimension 2n. Stabilizer states had previously only been known to constitute 2-designs. The main techn...

An element of a group acting on a graph is called invertor if it transfers an edge of the graph to its inverse. In this paper, we show that if G is a group acting on a tree X with inversions such that G does not fix any element of X, then an element g of G is invertor if and only if g is not in any vertex stabilizer of G and g2 is in an edge stabilizer of G. Moreover, if H is a finitely generat...

A subgroup H of a group G is called malnormal in G if it satisfies the condition that if g ∈G and h∈H, h≠ 1 such that ghg−1 ∈H, then g ∈H. In this paper, we show that if G is a group acting on a tree X with inversions such that each edge stabilizer is malnormal in G, then the centralizer C(g) of each nontrivial element g of G is in a vertex stabilizer if g is in that vertex stabilizer. If g is ...

In this Section we state some facts concerning stabilizer groups and stabilizer states. Let Pn be the n-qubit Pauli group. Any element of Pn has the form iP1⊗ · · · ⊗Pn, where each factor Pa is either the identity or a singlequbit Pauli operator X,Y, Z and m ∈ Z4. An abelian subgroup G ⊆ Pn is called a stabilizer group if −I / ∈ G. Each stabilizer group has the form G = 〈G1, . . . , Gr〉 for som...

a multi objective honey bee mating optimization (hbmo) designed by online learning mechanism is proposed in this paper to optimize the double fuzzy-lead-lag (fll) stabilizer parameters in order to improve low-frequency oscillations in a multi machine power system. the proposed double fll stabilizer consists of a low pass filter and two fuzzy logic controllers whose parameters can be set by the ...