The cation distribution of the NTC thermistor spinel N i M n 2 O 4 $NiM{n}_2{O}_4$ was studied in temperature range from 55°C to 900°C, using a combined in-situ neutron diffraction and thermopower study. Rietveld refinements data reveal dependence degree inversion with an parameter 0.70(1) at 900°C 0.87(1) 55°C. Thermopower measurements were evaluated modified Heikes formula [Mn4+]/[Mn3+]-ratio...

Here we report on the effect of the mass transfer rate (k(t)) on the oxygen reduction reaction (ORR) catalyzed by Pt dendrimer-encapsulated nanoparticles (DENs) comprised of 147 and 55 atoms (Pt(147) and Pt(55)). The experiments were carried out using a dual-electrode microelectrochemical device, which enables the study of the ORR under high k(t) conditions with simultaneous detection of H(2)O(...

  Background: Reproductive health problems affect youths in all countries. There is an urgent need to enhance youths reproductive health services to provide a healthy life for this group. In this regard, the present study aimed to evaluate the Reproductive Health Peer Education Program based on the opinion of university students.   Methods :This interventional study was conducted in Qazvin Univ...