POWER BALANCING TOPOLOGY FIVE-LEVEL CASCADED H-BRIDGE INVERTER WITH PHASE SHIFT TECHNIQUE FOR PHOTOVOLTAIC SOURCES

This research paper proposes a power balance optimization topology for a five-level cascaded H-bridge inverter with a phase shift technique. This topology uses two phase-shifted sine waveforms 180 degrees apart to modulate the two triangular waveforms. These two triangular waveforms are assigned a 90-degree phase shift. When the outputs of the two H-bridge inverters are connected in series, the total output waveform is 5 levels. The principles and methods of this research will focus on a cascaded H-bridge inverter with photovoltaic sources. Two independent units are connected in series to allow linear and non-linear loads at a maximum one-kilowatt rating. However, the researcher will create a prototype mechanism to test the power balance and power distribution efficiency of the two inverters compared with the simulation results using MATLAB/Simulink. Nevertheless, the results showed that the power balance efficiency could be improved, resulting in the mean efficiency of both inverters of 96%. When the harmonics were measured, the load was not Linear produced third- and fifth-order harmonics greater than linear load. This research confirms that the simulation with MATLAB/Simulink program and the prototype is correct and acceptable.

Hepatocellular Carcinoma with Macroscopic Fat Metamorphosis: A Case Series

Hepatocellular carcinoma (HCC) is the fourth leading cause of cancer-related deaths in the world, with hepatitis B and C as its main causes. HCC can have fat metamorphosis which leads to a better prognosis, though this is more commonly found in lesions smaller than 3 cm in diameter, and usually contains intravoxel fat. In this case series, we present three cases of HCC with macroscopic fat metamorphosis as examined using CT scan and MRI. Macroscopic fat is seen using CT as a hypodense mass with attenuation of −10 to −100 HU, or MRI using fat-saturation technique. Intravoxel fat can be seen on MRI using fat saturation chemical shift technique, appearing as signal loss during opposed phase and increased signal during in-phase. The differential diagnoses of HCC with fat metamorphosis are angiomyolipoma, hepatic adenoma, nodular steatosis, focal nodular hyperplasia, dysplastic nodule, liposarcoma, and hepatic metastasis. Enhancement patterns of the fat and non-fat component; intra-tumoral fat distribution; the presence of cirrhosis; the presence of atoll sign; and history of viral hepatitis are useful clues for differentiation of HCC with other differential diagnoses.

Give me a magazine – hooray for the game! (description of the magazines "Grotexny Mnogopotam" and "TraNvay 13", 1986–1998, executive editor M.V. Panov)

The article describes the content and the poetics of the magazines “Grotexny Mnogopotam”, “TraNvay 13”. The “poetic shift” is a dominant technique in the home magazines edited by M.V. Panov. In the creating process of the magazines the poetic shift technique extends to non-verbal reality and combines word, image, and game.