Studies on Europe and the U.S. indicate that marriage has been postponed, cohabitation has increased, and unions are more likely to dissolve. However, no study has been able to capture all of these dimensions simultaneously. Here we use latent class growth models to trace the complexity of union formation in the United States and 14 countries in Europe. We examine how union status can change be...

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Previous studies have shown that exposure to a hypoxic in vitro environment increases the secretion of pro-angiogenic growth factors by human adipose-derived stromal cells (hASCs) [Cao Y, et al., Biochem Biophys Res Commun 332: 370-379, 2005; Kokai LE, et al., Plast Reconstr Surg 116: 1453-1460, 2005; Park BS, et al., Biomed Res (Tokyo) 31: 27-34, 2010; Rasmussen JG, et al., Cytotherapy 13: 318...

A STUDY OF TRACE-ELEMENT PARTITIONING BETWEEN PYROXENE AND ANGRITIC MELT: EQUILIBRIUM AND KINETIC EFFECTS INCLUDING SECTOR ZONING IN PYROXENE. G. E. Lofgren 1, A. J. Fahey2, and G. J. Wasserburg2, 'Mail Code SN4, NASA Johnson Space Center, Houston TX 77058, USA, 2Lunatic Asylum, Division of Geological and Planetary Science, Mail Stop 170-25, California Institute of Technology, Pasadena CA 91125...

The paging problem is that of deciding which pages to keep in a memory of k pages in order to minimize the number of page faults. We develop the marking algorithm, a randomized on-line algorithm for the paging problem. We prove that its expected cost on any sequence of requests is within a factor of 2Hk of optimum. (Where Hk is the kth harmonic number, which is roughly Ink.) The best such facto...