The relationship between surface- and bulk-related physical and mechanical characteristics of polypropylene (PP)-based composites filled with nanodiamond soot (NDS) particles was investigated. The tribological properties of a composite were considered as surface properties. Wear and friction coefficient values were measured using a steel pin-on-composite disk testing procedure under the justified set of test parameters. Loading of NDS particles to the PP matrix resulted in a drastic increase in the composite’s wear resistance. A significant increase in friction coefficient and contact temperature was observed for the composites with NDS content below a certain value assumed to be the percolation threshold for the selected processing method and components used. After the percolation threshold is reached, the friction coefficient decreases sharply and returns to the value characteristic of a filler-free PP. The effects observed were attributed to changes in properties of polymer matrix and composite melt.
Congenital adrenal hyperplasia (CAH) patients with testicular adrenal rest tumors (TARTs) with testicular enlargement present a serious diagnostic challenge. According to the data TARTs are usually benign. They are rare, resulting in paucity in the medical literature regarding their pathological features. We report a case of bilateral synchronous mass-forming TARTs with marked cytological and nuclear atypia misinterpreted as malignant testicular tumors in a 40-years-old man with CAH and CT and MRI data for pheochromocytoma of the right adrenal gland and paraaortal and paracaval lymphadenomegaly. He was previously diagnosed with adrenal cortical carcinoma of the left adrenal gland.
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