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We investigate the effects of entanglement on polymer crystallization using atomistic molecular dynamics simulations of linear and cyclic polyethylene (PE). While linear chains entangle with their neighbors, unlinked rings adopt compact conformations and do not exhibit conventional entanglements. By isotropically compressing linear chains, we also systematically reduce the entanglement density in PE melts without enhancing any local order that may promote crystallization. After demonstrating tha

A diagram depicting a U.S. map of industrial plants that pollute greenhouse gases and toxic emissions into the air, including the manufacturers AEC in Petersburg, Indiana, Alcoa in Newburgh, Indiana and the American Electric Power company in Rockport, Indiana.

We apply molecular dynamics simulations to quantify the effects of free surfaces and interfacial regions on crystallization in freestanding and bilayer polymer films. We show that enhanced crystal nucleation in polymer thin films is quantitatively correlated to faster local segmental dynamics induced by free surfaces. When a second layer is deposited onto a semicrystalline film, we observe rapid primary nucleation near the free surface, secondary nucleation near the semicrystalline interface, an

We apply molecular dynamics simulations to quantify the effects of free surfaces and interfacial regions on crystallization in freestanding and bilayer polymer films. We show that enhanced crystal nucleation in polymer thin films is quantitatively correlated to faster local segmental dynamics induced by free surfaces. When a second layer is deposited onto a semicrystalline film, we observe rapid primary nucleation near the free surface, secondary nucleation near the semicrystalline interface, an

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Here we present a draft genome sequence of the nematode Pristionchus pacificus, a species that is associated with beetles and is used as a model system in evolutionary biology. With 169 Mb and 23,500 predicted protein-coding genes, the P. pacificus genome is larger than those of Caenorhabditis elegans and the human parasite Brugia malayi. Compared to C. elegans, the P. pacificus genome has more genes encoding cytochrome P450 enzymes, glucosyltransferases, sulfotransferases and ABC transporters,

We apply molecular dynamics simulations to quantify the effects of free surfaces and interfacial regions on crystallization in freestanding and bilayer polymer films. We show that enhanced crystal nucleation in polymer thin films is quantitatively correlated to faster local segmental dynamics induced by free surfaces. When a second layer is deposited onto a semicrystalline film, we observe rapid primary nucleation near the free surface, secondary nucleation near the semicrystalline interface, an

We discuss the connection between the top quark, naturalness and flavor in composite Higgs models. The phenomenological features of the top quark and the associated fermionic partners are presented. The main realizations of the flavor structure, in particular the anarchic partial compositeness scenario and its possible modifications, are also briefly reviewed.