BACKGROUND Nowadays, the confronting dichotomous view between experimental/quasi-experimental and non-experimental/ethnographic studies still exists but, despite the extensive use of non-experimental/ethnographic studies, the most systematic work on methodological quality has been developed based on experimental and quasi-experimental studies. This hinders evaluators and planners' practice of e...

In scattering of H2 from Cu(111), vibrational excitation has so far defied an accurate theoretical description. To expose the causes of the large discrepancies with experiment, we investigate how the feature due to vibrational excitation (the "gain peak") in the simulated time-of-flight spectrum of (v = 1, j = 3) H2 scattering from Cu(111) depends on the surface temperature (Ts) and the possibi...

It is known that the filed product of two quasi-antiorders need not to be a quasi-antiorder. After some preparations, we give some sufficient conditions in order that the filed product of two quasi-antiorder relations on the same set is a quasi-antiorder again. 2000Mathematics Subject Classification: Primary 03F65, Secondary 04A05, 08A02