Abstract Power system is constantly exposed to disturbances of varying intensity and cascading propagation of disturbance that can lead to partial or total power system blackout. Some of the consequences are network topology changes, outage of generator units or occurrence of low-frequency electromechanical oscillations (LFEO). One of the techniques for signal analysis and processing used in the past 20 years for power system disturbance analysis, and helped in better understanding of power system dynamic, is Wavelet Transform (WT). This work reviews WT applications for power system dynamic behavior analysis. With research made on vast literature it can be concluded that WT technique has different applications in disturbances identification and localization, LFEO identification and analysis, and assessment of active power imbalance.

The pattern reversal visual evoked potential (PR-VEP) is an objective method, stablished for noninvasive functional investigations. This research aimed to obtain data from the PR-VEP with checkerboard in adult domestic cats and the influence of different visual angles on the peak latency and implicit time of waves N75 and P100. It was used 13 adult cats (2-4 years old), of both sexes. Each animal was positioned 100 cm away from a video monitor located at 17.2o. The stimulus generated for the formation of wave VEPs was "square" with the frequency of 6Hz, presented in five spatial frequencies (16 ', 32', 64 ', 130' and 260 'of arc). Mean values of implicit times (ms) and amplitudes (µvolts) of P100 were not statistically different and were not correlated (r=0.067). With the change in size of the angle of stimulus presented, the peak implicit time and amplitude of P100 showed a slight variation. At 32 'of arc amplitude of P100 reached its peak with 14,94±1,13µV (mean±SEM). N75 showed no variation in amplitude. With 16'of arc the implicit time N75 decreased and no correlation with amplitude values was observed (r=0,26). The visual angle that triggered higher peak amplitude and implicit time constant for P100, was 32'of arc. In adult cats, PR-VEP can be obtained without mydriatic and sedatives, with stimuli subtending angles between large as 64' and small as 16 '

AbstractThe primary objective in the study is determination of efficacy of probiotic preparation as a supportive therapy in eradication of Helicobacter pylori.The study was multicenter, prospective, randomized, placebo controlled, and double-blind. The subjects first filled out a specially designed questionnaire to assess the severity of the 10 symptoms, which can be related to eradication therapy to be monitored during the trial. Each subject then received 28 capsules of probiotic preparation or matching placebo capsules, which they were supposed to take over the following 14 days, twice a day, at least 2 hours prior to or after the antibiotic therapy administration.A total of 804 patients were enrolled in the trial, of which 650 (80.85%) were included in the analysis. The results show a significantly larger share of cured subjects in the probiotic arm versus the placebo arm (87.38% vs 72.55%; P < 0.001). Additionally, presence and intensity of epigastric pain, bloating, flatulence, taste disturbance, loss of appetite, nausea, vomiting, heartburn, rash, and diarrhea were monitored over the study period. At 15 days postinclusion, probiotic treatment was found superior to placebo in 7 of 10 mentioned symptoms. Average intensity for symptoms potentially related to antibiotic therapy was significantly higher in the placebo group, 0.76 vs 0.55 (P < 0.001).Adding probiotics to the standard triple therapy for H pylori eradication significantly contributes to treatment efficacy and distinctly decreases the adverse effects of therapy and the symptoms of the underlying disease.