1,868 research outputs found
The seal of an official or an official seal? The use of court seals in Old Babylonian Susa and Haft Tepe
Susa in the late 3rd millennium: from a Mesopotamian colony to an independent state (MC 2110-1980)
Anthelmintic resistance of gastrointestinal cattle nematodes
Anthelmintic resistance of parasites in small ruminants, cattle and horses is increasing worldwide as a consequence of the over usage of the currently available products. In Belgium, Cooperia oncophora is the most common cattle nematode in which resistance, especially against macrocyclic lactones, occurs. Once resistance has been diagnosed, a change to another drug with a different mode of action is advised. However, effective anthelmintics will be hardly available in the near future. Therefore, it is important that farmers and veterinarians find a balance between achieving good parasite control and the sustainability of their control strategies. In this way, anthelmintic resistance may be delayed, and the effectiveness of anthelmintic drugs may be prolonged. This requires sensitive detection tools. With a sensitive detection technique, anthelmintic resistance can be diagnosed in a very early stage. Hence, the spread of resistance alleles in the parasite population may be prevented. In this review, different diagnostic assays for the detection of anthelmintic resistance are discussed, an overview is given of the current status of anthelmintic resistance in Belgian cattle, and measures are suggested to avoid or delay the development of anthelmintic resistance
Demonstrating the potential of Accurate Absolute Cross-grain Stress and Orientation correlation using Electron Backscatter Diffraction
We report a first exploration of High-angular-Resolution Electron Backscatter
Diffraction, without using simulated Electron Backscatter Diffraction patterns
as a reference, for absolute stress and orientation measurements in
polycrystalline materials. By co-correlating the pattern center and fully
exploiting crystal symmetry and plane-stress, simultaneous correlation of all
overlapping regions of interest in multiple direct-electron-detector,
energy-filtered Electron Backscatter Diffraction patterns is achieved. The
potential for highly accurate measurement of absolute stress, crystal
orientation and pattern center is demonstrated on a virtual polycrystalline
case-study, showing errors respectively below 20 MPa (or 1e-4 in strain), 7e-5
rad and 0.06 pixels.Comment: Manuscript as accepted for publication in Scripta Materiali
Theory of Nonequilibrium Spin Transport and Spin Transfer Torque in Superconducting-Ferromagnetic Nanostructures
Spin transport currents and the spin-transfer torques in voltage-biased
superconducting-ferromagnetic nanopillars (SFNFS point contacts) are computed.
We develop and implement an algorithm based on the Ricatti formulation of the
quasiclassical theory of superconductivity to solve the time-dependent boundary
conditions for the nonequilibrium Green's functions for spin transport through
the ferromagnetic interfaces. A signature of the nonequilibrium torque is a
component perpendicular to the plane spanned by the two ferromagnetic moments.
The perpendicular component is absent in normal-metal-ferromagnetic nanopillars
(NFNFN) contacts, but is shown to have the same order of magnitude as the
in-plane torque for non-equilibrium SFNFS contacts. The out-of-plane torque is
due to the rotation of quasiparticle spin by the exchange fields of the
ferromagnetic layers. In the ballistic limit the equilibrium torque is related
to the spectrum of spin-polarized Andreev bound states, while the {\sl ac}
component, for small bias voltages, is determined by the nearly adiabatic
dynamics of the Andreev bound states. The nonlinear voltage dependence of the
non-equilibrium torque, including the subharmonic gap structure and the
high-voltage asymptotics, is attributed to the interplay between multiple
Andreev reflections, spin filtering and spin mixing. These properties of spin
angular momentum transport may be exploited to control the state of
nanomagnets.Comment: 15 pages, 14 figure
In Susa's Fields : on the topography of fields in Old Babylonian administrative documents from Susa
The catastrophic imperative: subjectivity, time and memory in contemporary thought: introduction
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