Integral constraints on the monodromy group of the hyperkahler resolution of a symmetric product of a K3 surface

Let M be a 2n-dimensional Kahler manifold deformation equivalent to the Hilbert scheme of length n subschemes of a K3 surface S. Let Mon be the group of automorphisms of the cohomology ring of M, which are induced by monodromy operators. The second integral cohomology of M is endowed with the Beauville-Bogomolov bilinear form. We prove that the restriction homomorphism from Mon to the isometry group O[H^2(M)] is injective, for infinitely many n, and its kernel has order at most 2, in the remaining cases. For all n, the image of Mon in O[H^2(M)] is the subgroup generated by reflections with respect to +2 and -2 classes. As a consequence, we get counter examples to a version of the weight 2 Torelli question, when n-1 is not a prime power.Comment: Version 3: Latex, 54 pages. Expository change

Topological dragging of solitons

We put forward properties of solitons supported by optical lattices featuring topological dislocations, and show that solitons experience attractive and repulsive forces around the dislocations. Suitable arrangements of dislocations are even found to form soliton traps, and the properties of such solitons are shown to crucially depend on the trap topology. The uncovered phenomenon opens a new concept for soliton control and manipulation, e.g., in disk-shaped Bose-Einstein condensates.Comment: 15 pages, 5 figures, to appear in Physical Review Letter

Beef cattle genetic and breeding projects in Vietnam and the future direction

Vietnam’s current and future human population estimates are presented. Present per capita ruminant and non-ruminant meat consumption is also reported. Based on this information, projected demand for meat from both ruminant and non-ruminant sources in 2010 will outstrip supply. It is estimated that Vietnam has the capacity to supply a high proportion of these projected shortfalls through improvement and development of its existing production systems. Specifically, this paper is focussed on describing the beef cattle breeds in Vietnam and their respective production characteristics. Further, factors that are preventing the development of coordinated beef cattle breeding strategies to improve productivity and profitability are identified and ACIAR and AusAID projects developed to improve the profitability of farmers’ beef production systems are discussed. Finally, recommendations to ensure the future development of coordinated beef cattle breeding strategies that will assist in improving the profitability of farmers’ beef enterprises are presented

FermiFermi GBM Observations of V404 Cyg During its 2015 Outburst

V404 Cygni was discovered in 1989 by the $Ginga$ X-ray satellite during its only previously observed X-ray outburst and soon after confirmed as a black hole binary. On June 15, 2015, the Gamma Ray Burst Monitor (GBM) triggered on a new outburst of V404 Cygni. We present 13 days of GBM observations of this outburst including Earth occultation flux measurements, spectral and temporal analysis. The Earth occultation fluxes reached 30 Crab with detected emission to 100 keV and determined, via hardness ratios, that the source was in a hard state. At high luminosity, spectral analysis between 8 and 300 keV showed that the electron temperature decreased with increasing luminosity. This is expected if the protons and electrons are in thermal equilibrium during an outburst with the electrons cooled by the Compton scattering of softer seed photons from the disk. However, the implied seed photon temperatures are unusually high, suggesting a contribution from another source, such as the jet. No evidence of state transitions is seen during this time period. The temporal analysis reveals power spectra that can be modeled with two or three strong, broad Lorentzians, similar to the power spectra of black hole binaries in their hard state

Enhancing the Sensitivity of SMS Fiber Sensors by the Use of High Refractive Index Coatings

This paper presents a study on the behavior of single-mode/multimode/single-mode sensors with diamond-like carbon coating of high refractive index. Spectra and response for different values of the external medium refractive index are recorded and analyzed

Electroseismic Logging For The Detection And Characterization Of Permeable Zones: Field Measurements And Theory

A Stoneley wave propagating in a borehole generates pore fluid flow within the permeable zones intersected by the borehole. In turn, the fluid flow induces a streaming electrical potential. This electrical potential induced by the Stoneley wave can be -measured in the field at frequencies from 100Hz to 4000Hz. Measurements of this Stoneley-wave-induced electrical potential can be used to detect fractures and permeable zones. The amplitude-versus-frequency dependence of this electroseismic phenomenon provides a new way to test theories of the acoustics and the electrokinetics of porous media against field measurements in real :oeks.Massachusetts Institute of Technology. Borehole Acoustics and Logging ConsortiumMassachusetts Institute of Technology. Earth Resources Laboratory. Reservoir Delineation Consortiu

Pisces, Perciformes, Eleotridae, <i>Dormitator maculatus</i> (Bloch, 1792): Distribution extension for Patos-Mirim lagoon system, state of Rio Grande do Sul, Brazil.

We present here the record of Dormitator maculatus (Bloch, 1792) to the Patos-Mirim lagoon system, RioGrande do Sul, Brazil. This is also the southernmost occurrence in South America, extending species range ca. 150 km fromthe previously known localities