Following absorption of a single photon, angles of simultaneous emission of two electrons from a He n S atom become more correlated with increasing n. We find that the strength of this correlation is due to the two-electron continuum of the electron-impact ionization of the He+ ns ion. The strength is determined by the width of the momentum profile of the ionic ns state but not the strength of ...

in this research, the influence of bolt preload on the fatigue strength of 2024-t3 aluminium alloy double lap bolted joints has been studied experimentally and numerically. to do so, three sets of the specimens were prepared and each of them subjected to tightening torque of 1,2.5 and 5 n-m and then fatigue tests were conducted under various cyclic axial load levels. in the numerical method, th...

Background : Low vitamin D status is associated with reduced muscle strength, but the benefit of vitamin D supplementation is not clear. Objective : To study whether a daily supplement of vitamin D could improve grip strength. Design : A subtrial of a double-blinded, controlled trial studying the effect of vitamin D on the incidence of hip fractures and other osteoporosis fractures in a frail n...