Van der Waals (vdW) forces are the dominant interactions between neutral particles on nanometer-tomicrometer length scales. This makes their effects ubiquitous in physics, chemistry, and biology: they are, for instance, responsible for the action of detergents, the selfassembly of viruses, and even the ability of geckos to climb flat surfaces. Their existence was first proposed by Johannes Dide...

This paper examines the effect of elective surgery receipt on paid and unpaid labor supply amongst older adults. I find that osteoarthritic patients receiving elective hip or knee replacements in hospital referral regions with high rates of elective procedure use, where the marginal surgery is believed to be more discretionary, increase participation in paid work and volunteering after surgery....

In this article, under certain parametric conditions, we study the first integrals of the Duffing-van der Pol-type oscillator equations which include the van der Pol and the Duffing oscillator systems, as particular cases. After making a series of variable transformations and applying the PrellerSinger method, we find the first integrals of the simplified equations without complicated calculati...

All roadmaps reports are under revision of the European Commission, final approval from the EC is pending. The present document is a roadmap report prepared by Willems & van den Wildenberg (W&W) in the framework of the NanoRoadMap (NRM) project, co-funded by the 6th Framework Programme (FP6) of the European Commission. This roadmap report is mainly based on the input received from experts parti...

ELLIS-van CREVELD SYNDROME IN A NIGERIAN WOMAN: A CASE STUDY 1 2 1 1 AHMADU MS, TALLEMA, AHIDJO A, TAHIR AA Ellis-van Creveld (EVC) syndrome or chondroectodermal dysplasia is a rare, autosomal recessive th disorder that was first described by Ellis and van Creveld in the mid-20 century.The syndrome is characterized by a tetrad of chondrodystrophy, post axial polydactyly, and hidrotic ectodermal...