126 research outputs found
Temperature independent diffuse scattering and elastic lattice deformations in relaxor PbMg1/3Nb2/3O3
The results of diffuse neutron scattering experiment on PbMg1/3Nb2/3O3 single
crystal above the Burns temperature are reported. It is shown that the high
temperature elastic diffuse component is highly anisotropic in low-symmetry
Brillouin zones and this anisotropy can be described using Huang scattering
formalism assuming that the scattering originates from mesoscopic lattice
deformations due to elastic defects. The qualitative agreement between this
model and the experimental data is achieved with simple isotropic defects. It
is demonstrated that weak satellite maxima near the Bragg reflections can be
interpreted as the finite resolution effect.Comment: 7 pages, 7 figure
Reduction of Active Power Loss at 110/220 kV Node Substations Using Fuzzy Controller
One of the most important informational components of control systems is the data of the static load characteristics of each transformer of the substation. Currently, the evaluation of real static characteristics of the load is determined generally by the following methods: computational, ana-lytical, passive and active experiments. These methods exhibit significant disadvantages regarding accuracy and cost rating and encounter plenty of parameters that are difficult to formalize (including climatic factors). The purpose of this work is to reduce electric power losses at 110/220 kV substations by implementation of a new control system for power transformers. This goal has been achieved by using a fuzzy controller in the structure of the control system for power transformers of 110/220 kV tie substations. The presented solution is multi-functional and can be extended to a wide class of power facilities. The results of the simulation of the transformer voltage regulation process, performed in the MatLAB application environment, showed that the implementation of a new fuzzy controller structure had improved the efficiency of the substation power control system in forecasting and management (compared to classical solutions based on regression and probabilistic models). Herewith, the most accurate accounting of consumer load, the maximum use of equipment at the substation for voltage regulation at the points of release and a significant reduction of active power losses at the tie substa-tions 110/220 kV (up to 12,12%) compared to already known solutions were observed
Strange axial-vector mesons mixing angle
The masses of the and are considered in a
nonrelativistic constituent quark model, and the absolute value of the
mixing angle is determined to be about .
Comparison of the theoretical predictions on the strong decay widths of the
and in the decay model as well as the
production ratio of these two states in the decay between the available
experimental data strongly favors that the mixing angle
is about .Comment: 12 papes, to appear in Eur. Phys. J.
Regarding the axial-vector mesons
The implications of the mixing for the
mixing angle is investigated. Based on the
mixing angle suggested from the analysis
for a substantial body of data concerning the and , the
masses of the and are determined to be MeV and MeV, respectively, which therefore
suggests that the mixing angle is about . Also, it is found that the mass of the
(mostly of ) state is about MeV. Comparison of the
predicted results and the available experimental information of the
shows that without further confirmation on the , the assignment of
the as the member of the meson nonet may be
premature.Comment: 11 pages, some typos corrected, accepted for publication in Eur.
Phys. J.
Structural heterogeneity and diffuse scattering in morphotropic lead zirconate-titanate single crystals
Complementary diffuse and inelastic synchrotron X-ray scattering measurements
of lead zirconate-titanate single crystals with composition near the
morphotropic phase boundary (x=0.475) are reported. In the temperature range
293 K < T < 400 K a highly anisotropic quasielastic diffuse scattering is
observed. Above 400 K this scattering disappears. Its main features can be
reproduced by model of inhomogeneous lattice deformations caused by inclusions
of a tetragonal phase into a rhombohedral or monoclinic phase. This observation
supports the idea that PZT at its morphotropic phase boundary is essentially
structurally inhomogeneous.Comment: 4 pages, 4 figure
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