Literature on solar sailing has thus far mostly considered radiation pressure (SRP) as the only contribution to sail force. However, considering a in planetary mission scenario, new can be added. Since planet itself emits radiation, this generates radial (PRP) that is also exerted sail. Hence, work studies combined effects of both SRP and PRP for two case studies, i.e. Earth Venus. In proximity...

We demonstrate that also the second sum involved in Apéry’s proof of the irrationality of ζ(3) becomes trivial by symbolic summation. In his beautiful survey [4], van der Poorten explained that Apéry’s proof [1] of the irrationality of ζ(3) relies on the following fact: If a(n) = n

Nurses are increasingly being called upon to lead changes within health care. How do nurses and, in particular, school nurses become leaders? School nurses lead daily in their work but often do not recognize themselves as leaders. The "Five C's of Leadership"-character, commitment, connectedness, compassion, and confidence-identified by Kowalski and Yoder-Wise are foundational to the developmen...

The unique teatures of the International Sailing Canoe have intrigued naval architects and sailors for years. This paper highlights the historical design development, describes current trends. and presents results from finite element analyses of three popular conSlruction methods: cold·molded cedar. fiberglass, and carbon/epoxy. Comparisons are presented of the bending and torsional stillness, ...

The aim of the present study was to investigate why blood lactate after prolonged quadriceps contraction during hiking is only marginally increased. Eight sailors performed five 3-min hiking bouts interspersed with 5-s recovery periods. Whole body oxygen uptake, heart rate and lactate were recorded, along with continuous-wave near-infrared spectroscopy measures of quadriceps oxygenation. The ti...

The 3'-untranslated region (UTR) of mRNA is crucial for posttranscriptional regulation. In this issue, Vasudevan and Steitz (2007) report a new function for AGO2 and FXR1--two proteins that have been linked to the regulation of microRNAs and translation repression. AGO2 and FXR1 bind to the AU-rich element in the 3'-UTR of TNFalpha mRNA, unexpectedly activating its translation in a cell growth-...