Oxygen electrocatalysis is crucial for renewable energy conversion and storage technologies. Specifically proton exchange membrane fuel cells (PEMFCs), oxygen reduction reaction (ORR) the primary that determines performance costs. The ORR activity durability are commonly assessed using a rotating disk electrode (RDE). However, there numerous inconsistencies in RDE measurements among researchers...

We study the multicolour discrepancy of spanning trees and Hamilton cycles in graphs. As our main result, we show that under very mild conditions, r-colour spanning-tree a graph G is equal, up to constant, minimum s such can be separated into r equal parts by deleting vertices. This result arguably resolves question estimating essentially all graphs interest. In particular, it allows us immedia...

This study reviews cases discussed at radiology departmental discrepancy meetings and retrospectively determines patterns of radiological error. All cases discussed since the inception of our departmental discrepancy meetings (20-month period) were reviewed. Discrepancies were classified according to the RADPEER score. The imaging method from which the discrepancy arose was recorded. An attenda...

This study was conducted (1) to document discrepancies between preoperative and postoperative radiographic measurements and postregistration and postimplantation intraoperative navigational measurements of coronal limb alignments, and (2) to identify predictors of discrepancies between radiographic and navigational measures. In addition, we propose the use of a novel radiographic measuring meth...