Geochemical clues on the origins of Rajahmundry Trap basalts, India K. B. KNIGHT, J. A. BAKER, P. R. RENNE, A. HALKETT AND N. WHITE University of California, Berkeley, USA (kbk@uclink.berkeley.edu) Danish Lithosphere Centre, Copenhagen, Denmark (jab@dlc.ku.dk) Berkeley Geochronology Center and University of California, Berkeley, USA (prenne@bgc.org) Bullard Laboratories, Cambridge, UK (halkett@esc.cam.ac.uk, nwhite@esc.cam.ac.uk)
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Abstract We analyse the role of economic and security considerations in bilateral trade agreements. We use the pre‐World War I period to test whether trade agreements are governed by standard gravity variables, or by instead—or in addition—geopolitical factors. While we like others find support for standard gravity variables, we also find that defence pacts boost the probability of trade agreements by as much as 20 percentage points. Our estimates imply that were the U.S. to alienate its geopolitical allies, the likelihood and benefits of successful bilateral agreements would fall significantly. Trade creation from an agreement between the U.S. and E.U. countries would decline by about 0.6 per cent of total U.S. exports.
In this paper, we propose a Star cellular neural network (Star CNN) for associative and dynamic memories. A Star CNN consists of local oscillators and a central system. All oscillators are connected to a central system in the shape of a Star, and communicate with each other through a central system. A Star CNN can store and retrieve given patterns in the form of synchronized chaotic states with appropriate phase relations between the oscillators (associative memories). Furthermore, the output pattern can occasionally travel around the stored patterns, their reverse patterns, and new relevant patterns which are called spurious patterns (dynamic memories).
This paper considers the determinants of \n exports of modern services and traditional services. It \n considers the growth of export volumes as well as export \n surges, that is, the periods of rapid sustained export \n growth. It asks whether the determinants of export growth \n rates and export surges differ between merchandise, \n traditional services, and modern services and whether \n developing countries are different. It confirm the \n importance of the real exchange rate for export growth. The \n paper finds that the effect of the real exchange rate is \n even stronger for exports of services than for exports of \n goods and that it is especially strong for exports of modern \n services. The results suggest that in the course of their \n development, as developing countries shift from exporting \n commodities and merchandise to exporting traditional and \n modern services, appropriate policies toward the real \n exchange rate become even more important.
We report a concise, enantioselective total synthesis of (−)-taiwaniaquinone H and the first enantioselective total synthesis of (−)-taiwaniaquinol B by a route that includes asymmetric palladium-catalyzed α-arylation of a ketone with an aryl bromide that was generated by sterically controlled halogenation via iridium-catalyzed C−H borylation. This asymmetric α-arylation creates the benzylic quaternary stereogenic center present in the taiwaniaquinoids. The synthesis was completed efficiently by developing a Lewis acid-promoted cascade to construct the [6,5,6] tricyclic core of an intermediate common to the synthesis of a number of taiwaniaquinoids. Through the preparation of these compounds, we demonstrate the utility of constructing benzylic quaternary stereogenic centers, even those lacking a carbonyl group in the α-position, by asymmetric α-arylation.
Hierarchical ordering of mesoporous silica induced by fluoride addition is described for aqueous acid-syntheses. The authors report that small amounts of fluoride make it possible to control the organization of the mesoporous materials on different length scales. At low pH, fluoride addition brings about the formation of large hydrothermally stable silica rods (see Figure) consisting of aligned bundles of mesoporous silica fibers.
We investigated the effect of sleep deprivation on postural control during a simple reaction time task (SRT), during a task requiring the intermittent inhibition of a reaction (IRT), and in the absence of a concurrent information processing task. Postural sway, i.e. changes in center of pressure on a force platform, was recorded in three increasingly difficult standing conditions (fixed platform, sway-referenced platform and sway-referenced platform with sway-referenced visual scene) during the three information-processing task conditions. Five healthy subjects performed the tasks either after normal sleep or following 24 h of sustained wakefulness. As hypothesized, sleep deprivation significantly increased postural sway only in the IRT condition. Within the IRT condition, sleep deprivation significantly increased sway across all postural conditions.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
