abstract background: advancements in neonatal intensive care unit (nicu) science and technology have increased the survival rate of preterm infants. despite these advances, they are still facing with neurobehavioral problems. noise level in nicu is a potential source of stress for preterm infants. it should be decreased to the standard level as much as possible. the purpose of this study was to...

For a finite group $G$ and $U: = U(\mathbb{Z}G)$, the of units integral ring $G$, we study implications structure on abelianization $U/U'$ $U$. We pose questions connections between exponent $G/G'$ as well ranks torsion-free parts $Z(U)$, center $U$, $U/U'$. show that originating from known generic constructions in $\mathbb{Z}G$ are well-behaved under projection $U$ to our have positive answer ...