Nanocomposites based on titanium dioxide and epoxy polymer nanoparticles have been obtained and investigated by the in situ method at the stage of curing with preliminary ultrasonic dispersion and evacuation. The composition and structure of the obtained TiO2 nanocomposites have been studied by IR spectroscopy and scanning electron microscopy. It is shown that with an increase in the content of nanoparticles, their average size increases to 88 nm at a TiO2 concentration of 1% as a result of secondary aggregation processes

In this work, polymer composite materials based on nanoparticles of titanium dioxide and epoxy polymer have been obtained. The dielectric properties of the obtained composite are investigated. Studies have shown that the introduction of TiO2 nanoparticles into an epoxy polymer leads not only to a slowdown in relaxation processes, but also increases the value of the through conduction. It was shown that the greatest influence of the introduction of nanoparticles on relaxation processes is observed on the α-relaxation

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This study was carried out on 64 patients with a preoperative diagnosis of cholecystitis and preoperative ultrasound at E hospital. Results: mean age was 57.4 ± 16.1; male/female = 1/1.3; 95.3% cholecystitis with gallstones; 100% of chronic cholecystitis had gallstones, gallstones stuck in gallbladder neck accounted for 18.7%; gallbladder wall thickening accounts for 67.2%, in acute cholecystitis, this rate accounts for 90%; Sono-Murphy (+) accounted for 67.2%; in the group of patients with acute cholecystitis, this sign accounts for 95%. Peri-gall bladder fluid accounts for 60% of acute cholecystitis. Value of ultrasound in diagnosis: gallstones Se 100%; Acc 96.9%; PPV 96.7%; stones stuck in gallbladder neck: Se 42.8%; Sp 88%; Acc 78.1%; PPV 50%; NPV 84.6%; gallbladder wall thickness: Se 88.9%; Sp 60.7%, Acc 76.6%; PPV 74.4%, NPV 80.9%; fluid around the gallbladder: Se 82.1%; Sp 94.4%; Acc 89.1%; PPV 92.0%; NPV 87.2%; fat infiltration around the gallbladder: Se 35.7%; Sp 100%; Acc 71.9%; PPV 100%; NPV 66.7%; cholecystitis: Se 70.3%, Acc 70.3%; PPV 70.3%. Conclusion: Ultrasonography is reliable enough in the diagnosis of cholecystitis. Keywords: Cholecystitis, gallstones, ultrasound.