The rare genus Leptofoenus Smith, 1862 (Hymenoptera: Pteromalidae, Leptofoeninae): new records, and aspects of its distribution

Despite being the largest and most remarkable species of Chalcidoidea, species of Leptofoeninae are very rarely collected. Here, we expand the distribution range extension of the Leptofoenus howardi (Ashmead, 1895) for Rondônia and Minas Gerais, Leptofoenus stephanoides (Roman, 1920) for Rondônia, Espírito Santo and São Paulo and Leptofoenus westwoodi (Ashmead, 1895) for Roraima, Amazonas, Rondônia, Bahia, Minas Gerais, Rio de Janeiro and Rio Grande do Sul

Aeration and rheology of buttercream icings

Buttercream icings – 4 phase materials comprising sugar, butter (an emulsion) and air – are widely used for coating and decorating sweet goods. The aeration of 2:1 w/w sugar-butter mixtures was investigated in 2 benchtop planetary mixers and the rheology of the resultant viscoplastic material was quantified using lubricated compressive testing (squeeze flow and upsetting) over extensional shear rates of 10−3–100 s−1. The aeration dynamics exhibited asymptotic behaviour which fitted a simple phenomenological model well. Optical microscopy and X-ray microtomography indicated that the air was incorporated as small bubbles of similar size to the sugar particles or as voids generated by the mixer wires. The measured yield stress was strongly dependent on the air volume fraction, φ. The flow behaviour for one batch could be reasonably described as a Herschel-Bulkley fluid whereas a second batch gave overall better agreement with a modified power-law description: in both cases the viscous friction term decreased strongly with φ.Fil: Fernandes, R.R.. University of Cambridge; Reino UnidoFil: Calver, K.E.. University of Cambridge; Reino UnidoFil: Hayes, D.. University of Cambridge; Reino UnidoFil: Murphy, A.E.. University of Cambridge; Reino UnidoFil: Meza, Barbara Erica del Valle. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Orona, Jesica Daiana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Zorrilla, Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Walton, H.C.. University of Cambridge; Reino UnidoFil: Wilson, D Ian. University of Cambridge; Reino UnidoFil: Peralta, Juan Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentin

Possible Unconventional Superconductivity In Substituted Bafe 2 As 2 Revealed By Magnetic Pair-breaking Studies

The possible existence of a sign-changing gap symmetry in BaFe 2 As 2 -derived superconductors (SC) has been an exciting topic of research in the last few years. To further investigate this subject we combine Electron Spin Resonance (ESR) and pressure-dependent transport measurements to investigate magnetic pair-breaking effects on BaFe 1.9 M 0.1 As 2 (M = Mn, Co, Cu, and Ni) single crystals. An ESR signal, indicative of the presence of localized magnetic moments, is observed only for M = Cu and Mn compounds, which display very low SC transition temperature (T c) and no SC, respectively. From the ESR analysis assuming the absence of bottleneck effects, the microscopic parameters are extracted to show that this reduction of T c cannot be accounted by the Abrikosov-Gorkov pair-breaking expression for a sign-preserving gap function. Our results reveal an unconventional spin- and pressure-dependent pair-breaking effect and impose strong constraints on the pairing symmetry of these materials.4Kamihara, Y., Watanabe, T., Hirano, M., Hosono, H., Iron-based layered superconductor La[O12xFx]FeAs (x 5 0. 05-0. 12) with Tc 5 26 K (2008) J. Am. Chem. Soc., 130, p. 3296Rotter, M., Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2 (2008) Phys. Rev. B, 78, pp. 020503RIshida, K., Nakai, Y., Hosono, H., To what extent iron-pnictide new superconductors have been clarified: A progress report (2009) J. Phys. Soc. Japan, 78, p. 062001Hirschfeld, P.J., Korshunov, M.M., Mazin, I.I., Gap symmetry and structure of Fe-based superconductors (2011) Rep. Prog. Phys., 74, p. 124508Chubukov, A.V., Pairing mechanism in fe-based superconductors (2012) Annu. Rev. Cond. Mat. Phys., 3, p. 57Bittar, E.M., Co-substitution effects on the fe valence in the BaFe2As2 superconducting compound: A study of hard x-ray absorption spectroscopy (2011) Phys. Rev. Lett., 107, p. 267402Granado, E., Pressure and chemical substitution effects in the local atomic structure of BaFe2As2 (2011) Phys. Rev. B, 83, p. 184508Wadati, H., Elfimov, I., Sawatzky, G.A., Where are the extra d electrons in transition-metal-substituted iron pnictides? (2010) Phys. Rev. Lett., 105, p. 157004Ideta, S., Dependence of carrier doping on the impurity potential in transition-metal-substituted feas-based superconductors (2013) Phys. Rev. Lett., 110, p. 107007Berlijn, T., Lin, C.-H., Garber, W., Ku, W., Do transition-metal substitutions dope carriers in iron-based superconductors? (2012) Phys. Rev. Lett., 108, p. 207003Hin, Z.P., Haule, K., Kotliar, G., Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides (2011) Nature Materials, 10, pp. 932a-935aRosa, P.F.S., Evolution of Eu21 spin dynamics in Ba12xEuxFe2As2 (2012) Phys. Rev. B, 86, p. 165131Rosa, P.F.S., (2014) Site Specific Spin Dynamics in BaFe2As2: Tuning the Ground State by Orbital Differentiation, , arxiv:1402. 2001v01Garitezi, T.M., Transport critical current measurements on a Cu-substituted BaFe2As2 superconductor (2014) J. Appl. Phys., 115, pp. 17D704Rosa, P.F.S., Pressure effects on magnetic pair-breaking in Mn- and Eusubstituted BaFe2As2 (2014) J. Appl. Phys., 115, pp. 17D702Thaler, A., Physical and magnetic properties of Ba(Fe12xMnx) 2As2 single crystals (2011) Phys. Rev. B, 84, p. 144528Et Al., A., Pressure effects on the electron-doped high Tc superconductor BaFe22xCoxAs2 (2008) J Phys. Cond. Mat., 20, p. 472201Et Al., D., Pressure versus concentration tuning of the superconductivity in Ba(Fe12xCox) 2As2 (2010) J. Phys. Soc. Japan, 79, p. 124705Yamaichi, S., Katagiri, T., Sasagawa, T., Uniaxial pressure effects on the transport properties in Ba(Fe12xCox) 2As2 single crystals (2013) Physica C, 494, pp. 62-64Canfield, P.C., Budko, S.L., Ni, N., Yan, J.Q., Kracher, A., Decoupling of the superconducting and magnetic/structural phase transitions in electron-doped BaFe2As2 (2009) Phys. Rev. B, 80, pp. 060501RKirshenbaum, K., Saha, S.R., Ziemak, S., Drye, T., Paglione, J., Universal pairbreaking in transition metal-substituted iron-pnictide superconductors (2012) Phys. Rev. B, 86, pp. 140505ROnari, S., Kontani, H., Violation of Andersonaŝ Theorem for the Sign-Reversing s-Wave State of Iron-Pnictide Superconductors (2009) Phys. Rev. Lett., 103, p. 177001Li, J., Superconductivity suppression of Ba0. 5K0. 5Fe222xMn2xAs2 single crystals by substitution of transition metal (M 5 Mn, Ru, Co, Ni, Cu, and Zn) (2012) Phys. Rev. B, 85, p. 214509Bang, Y., Choi, H.-Y., Won, H., Impurity effects on the s6-wave state of the ironbased superconductors (2009) Phys. Rev. B, 79, p. 054529Wang, Y., Kreisel, A., Hirschfeld, P.J., Mishra, V., Using controlled disorder to distinguish s6 and s11 gap structure in Fe-based superconductors (2013) Phys. Rev. B, 87, p. 094504Fernandes, R.M., Vavilov, M.G., Chubukov, A.V., Enhancement of Tc by disorder in underdoped iron pnictide superconductors (2012) Phys. Rev. B, 85, pp. 140512RNi, N., Temperature versus doping phase diagrams for Ba(Fe12xTMx) 2As2 (TM 5 Ni,Cu,Cu/Co) single crystals (2010) Phys. Rev. B, 82, p. 024519Patz, A., Ultrafast observation of critical nematic fluctuations and giant magnetoelastic coupling in iron pnictides (2014) Nature Comm., 5, p. 3229Abrikosov, A.A., Gorkov, L.P., Contribution to the theory of superconducting alloys with paramagnetic impurities (1961) Sov. Phys. JETP, 12, p. 1243Skalski, S., Betbeder-Matibet, O., Weiss, P.R., Properties of superconducting alloys containing paramagnetic impurities (1964) Phys. Rev., 136, pp. A1500-A1518Pagliuso, P.G., Electron spin resonance of Gd31 in the normal state of RNi2B2C (R 5 Y, Lu) (1998) Phys. Rev. B, 57, p. 3668Korringa, J., Nuclear magnetic relaxation and resonance line shift in metals (1950) Physica, 16, p. 601Rettori, C., Dynamic behavior of paramagnetic ions and conduction electrons in intermetallic compounds: GdxLu12xAl2 (1974) Phys. Rev. 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Bifunctional primary amine 2-aminobenzimidazole organocatalyst anchored to trans-cyclohexane-1,2-diamine in enantioselective conjugate additions of aldehydes

Bifunctional chiral primary amine 8 containing an (S,S)-trans-cyclohexane-1,2-diamine scaffold and a 2-benzimidazole unit is used as a general organocatalyst for the Michael addition of α,α-branched aldehydes to nitroalkenes and maleimides. The reactions take place, with 20 mol % of catalyst in dichloromethane at rt for nitroalkenes and with 15 mol % catalyst loading in toluene at 10 °C for maleimides, in good yields and enantioselectivities. DFT calculations demonstrate the bifunctional character of this organocatalyst activating the aldehyde by enamine formation and the Michael acceptor by double hydrogen bonding.The Spanish Ministerio de Ciencia e Innovación (MICINN) (projects CTQ2010-20387, and Consolider Ingenio 2010, CSD2007-00006), the Spanish Ministerio de Economía y Competitividad (MINECO) (projects CTQ2013-43446-P and CTQ2014-51912-REDC), FEDER, the Generalitat Valenciana (PROMETEO 2009/039 and PROMETEOII/2014/017), the Basque Government (GV Grant IT-291-07), the FP7 Marie Curie Actions of the European Commission via the ITN ECHONET network (MCITN-2012-316379) and the Universities of Alicante and Basque Country are gratefully acknowledged for financial support. We also thank for technical and human support provided by IZO-SGI SGIker of UPV-EHU and European funding (ERDF and ESF). Financial support from Brazilian agencies CAPES-DGU (Project 200/09), CNPq, FAPERJ and UFRJ are also acknowledged. A. O. M. thanks MINECO for a FPI fellowship (BES-2014-069695)

Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS

The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new structure centered at a mass of 10.530+/-0.005 (stat.)+/-0.009 (syst.) GeV is also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes. This is interpreted as the chi_b(3P) system.Comment: 5 pages plus author list (18 pages total), 2 figures, 1 table, corrected author list, matches final version in Physical Review Letter

Search for displaced vertices arising from decays of new heavy particles in 7 TeV pp collisions at ATLAS

We present the results of a search for new, heavy particles that decay at a significant distance from their production point into a final state containing charged hadrons in association with a high-momentum muon. The search is conducted in a pp-collision data sample with a center-of-mass energy of 7 TeV and an integrated luminosity of 33 pb^-1 collected in 2010 by the ATLAS detector operating at the Large Hadron Collider. Production of such particles is expected in various scenarios of physics beyond the standard model. We observe no signal and place limits on the production cross-section of supersymmetric particles in an R-parity-violating scenario as a function of the neutralino lifetime. Limits are presented for different squark and neutralino masses, enabling extension of the limits to a variety of other models.Comment: 8 pages plus author list (20 pages total), 8 figures, 1 table, final version to appear in Physics Letters

Reducing heterotic M-theory to five dimensional supergravity on a manifold with boundary

This paper constructs the reduction of heterotic $M$-theory in eleven dimensions to a supergravity model on a manifold with boundary in five dimensions using a Calabi-Yau three-fold. New results are presented for the boundary terms in the action and for the boundary conditions on the bulk fields. Some general features of dualisation on a manifold with boundary are used to explain the origin of some topological terms in the action. The effect of gaugino condensation on the fermion boundary conditions leads to a `twist' in the chirality of the gravitino which can provide an uplifting mechanism in the vacuum energy to cancel the cosmological constant after moduli stabilisation.Comment: 16 pages, RevTe

Measurement of the inclusive isolated prompt photon cross-section in pp collisions at sqrt(s)= 7 TeV using 35 pb-1 of ATLAS data

A measurement of the differential cross-section for the inclusive production of isolated prompt photons in pp collisions at a center-of-mass energy sqrt(s) = 7 TeV is presented. The measurement covers the pseudorapidity ranges |eta|<1.37 and 1.52<=|eta|<2.37 in the transverse energy range 45<=E_T<400GeV. The results are based on an integrated luminosity of 35 pb-1, collected with the ATLAS detector at the LHC. The yields of the signal photons are measured using a data-driven technique, based on the observed distribution of the hadronic energy in a narrow cone around the photon candidate and the photon selection criteria. The results are compared with next-to-leading order perturbative QCD calculations and found to be in good agreement over four orders of magnitude in cross-section.Comment: 7 pages plus author list (18 pages total), 2 figures, 4 tables, final version published in Physics Letters