Unified Structural Representation of the southern California crust and upper mantle

We present a new, 3D description of crust and upper mantle velocity structure in southern California implemented as a Unified Structural Representation (USR). The USR is comprised of detailed basin velocity descriptions that are based on tens of thousands of direct velocity (Vp, Vs) measurements and incorporates the locations and displacement of major fault zones that influence basin structure. These basin descriptions were used to developed tomographic models of crust and upper mantle velocity and density structure, which were subsequently iterated and improved using 3D waveform adjoint tomography. A geotechnical layer (GTL) based on Vs30 measurements and consistent with the underlying velocity descriptions was also developed as an optional model component. The resulting model provides a detailed description of the structure of the southern California crust and upper mantle that reflects the complex tectonic history of the region. The crust thickens eastward as Moho depth varies from 10 to 40 km reflecting the transition from oceanic to continental crust. Deep sedimentary basins and underlying areas of thin crust reflect Neogene extensional tectonics overprinted by transpressional deformation and rapid sediment deposition since the late Pliocene. To illustrate the impact of this complex structure on strong ground motion forecasting, we simulate rupture of a proposed M 7.9 earthquake source in the Western Transverse Ranges. The results show distinct basin amplification and focusing of energy that reflects crustal structure described by the USR that is not captured by simpler velocity descriptions. We anticipate that the USR will be useful for a broad range of simulation and modeling efforts, including strong ground motion forecasting, dynamic rupture simulations, and fault system modeling. The USR is available through the Southern California Earthquake Center (SCEC) website (http://www.scec.org)

Phys Chem Chem Phys Phys Chem Chem Phys

Norbadione A (NBA) is a pigment present in edible mushrooms which is presumed to selectively complex Cs+ cations. Due to a very uncommon complexation mechanism, we used a combination of several experimental techniques, including H-1-NMR, Cs-133-NMR, isothermal calorimetric, potentiometric titrations and molecular dynamics MD simulations to determine the nature of the complexed species, as well as their stability constants for the NBA-M+ systems (M+ = Cs+, K+, Na+) in methanol : water 80 : 20 solutions at 25.0 degrees C. We show that almost no complexation occurs below pH 7.5, as long as a proton, involved in a strong hydrogen bond, bridges both carboxylic and enolic groups of each pulvinic moiety of NBA. Thus, neutralization of that proton is necessary to both set free potential coordination sites and to trigger a conformational change, two conditions needed to bind successively a first, then a second metallic cation. The stability constants determined in this study are in good agreement with each other, leading to the stability order Cs+ > K+ > Na+ for both mono- and bimetallic complexes, which is the reversed order to the one generally observed for low molecular weight carboxylic ligands in water. According to MD simulations in solution, complexation involves a mixture of Z/E isomers and conformers of NBA with a broad diversity of binding modes. Some pH and environment dependent aggregation phenomena are considered to also contribute to the binding process, and to possibly explain the accumulation of radionuclides in mushrooms.515mr Times Cited:4 Cited References Count:3

Bandwagonistas: rhetorical re-description, strategic choice and the politics of counter-insurgency

This paper seeks to explore how a particular narrative focused on populationcentric counterinsurgency shaped American strategy during the Autumn 2009 Presidential review on Afghanistan, examine the narrative’s genealogy and suggest weaknesses and inconsistencies that exist within it. More precisely our ambition is to show how through a process of ‘rhetorical redescription’ this narrative has come to dominate contemporary American strategic discourse. We argue that in order to promote and legitimate their case, a contemporary ‘COIN Lobby’ of influential warrior scholars, academics and commentators utilizes select historical interpretations of counterinsurgency and limits discussion of COIN to what they consider to be failures in implementation. As a result, it has become very difficult for other ways of conceptualizing the counterinsurgency problem to emerge into the policy debate